s390/block/dasd_eckd.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
0004  *          Horst Hummel <Horst.Hummel@de.ibm.com>
0005  *          Carsten Otte <Cotte@de.ibm.com>
0006  *          Martin Schwidefsky <schwidefsky@de.ibm.com>
0007  * Bugreports.to..: <Linux390@de.ibm.com>
0008  * Copyright IBM Corp. 1999, 2009
0009  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
0010  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
0011  */
0012
0013 #define KMSG_COMPONENT "dasd-eckd"
0014
0015 #include <linux/stddef.h>
0016 #include <linux/kernel.h>
0017 #include <linux/slab.h>
0018 #include <linux/hdreg.h>    /* HDIO_GETGEO              */
0019 #include <linux/bio.h>
0020 #include <linux/module.h>
0021 #include <linux/compat.h>
0022 #include <linux/init.h>
0023 #include <linux/seq_file.h>
0024
0025 #include <asm/css_chars.h>
0026 #include <asm/debug.h>
0027 #include <asm/idals.h>
0028 #include <asm/ebcdic.h>
0029 #include <asm/io.h>
0030 #include <linux/uaccess.h>
0031 #include <asm/cio.h>
0032 #include <asm/ccwdev.h>
0033 #include <asm/itcw.h>
0034 #include <asm/schid.h>
0035 #include <asm/chpid.h>
0036
0037 #include "dasd_int.h"
0038 #include "dasd_eckd.h"
0039
0040 #ifdef PRINTK_HEADER
0041 #undef PRINTK_HEADER
0042 #endif              /* PRINTK_HEADER */
0043 #define PRINTK_HEADER "dasd(eckd):"
0044
0045 /*
0046  * raw track access always map to 64k in memory
0047  * so it maps to 16 blocks of 4k per track
0048  */
0049 #define DASD_RAW_BLOCK_PER_TRACK 16
0050 #define DASD_RAW_BLOCKSIZE 4096
0051 /* 64k are 128 x 512 byte sectors  */
0052 #define DASD_RAW_SECTORS_PER_TRACK 128
0053
0054 MODULE_LICENSE("GPL");
0055
0056 static struct dasd_discipline dasd_eckd_discipline;
0057
0058 /* The ccw bus type uses this table to find devices that it sends to
0059  * dasd_eckd_probe */
0060 static struct ccw_device_id dasd_eckd_ids[] = {
0061     { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
0062     { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
0063     { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
0064     { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
0065     { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
0066     { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
0067     { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
0068     { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
0069     { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
0070     { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
0071     { /* end of list */ },
0072 };
0073
0074 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
0075
0076 static struct ccw_driver dasd_eckd_driver; /* see below */
0077
0078 static void *rawpadpage;
0079
0080 #define INIT_CQR_OK 0
0081 #define INIT_CQR_UNFORMATTED 1
0082 #define INIT_CQR_ERROR 2
0083
0084 /* emergency request for reserve/release */
0085 static struct {
0086     struct dasd_ccw_req cqr;
0087     struct ccw1 ccw;
0088     char data[32];
0089 } *dasd_reserve_req;
0090 static DEFINE_MUTEX(dasd_reserve_mutex);
0091
0092 static struct {
0093     struct dasd_ccw_req cqr;
0094     struct ccw1 ccw[2];
0095     char data[40];
0096 } *dasd_vol_info_req;
0097 static DEFINE_MUTEX(dasd_vol_info_mutex);
0098
0099 struct ext_pool_exhaust_work_data {
0100     struct work_struct worker;
0101     struct dasd_device *device;
0102     struct dasd_device *base;
0103 };
0104
0105 /* definitions for the path verification worker */
0106 struct pe_handler_work_data {
0107     struct work_struct worker;
0108     struct dasd_device *device;
0109     struct dasd_ccw_req cqr;
0110     struct ccw1 ccw;
0111     __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
0112     int isglobal;
0113     __u8 tbvpm;
0114     __u8 fcsecpm;
0115 };
0116 static struct pe_handler_work_data *pe_handler_worker;
0117 static DEFINE_MUTEX(dasd_pe_handler_mutex);
0118
0119 struct check_attention_work_data {
0120     struct work_struct worker;
0121     struct dasd_device *device;
0122     __u8 lpum;
0123 };
0124
0125 static int dasd_eckd_ext_pool_id(struct dasd_device *);
0126 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
0127             struct dasd_device *, struct dasd_device *,
0128             unsigned int, int, unsigned int, unsigned int,
0129             unsigned int, unsigned int);
0130
0131 /* initial attempt at a probe function. this can be simplified once
0132  * the other detection code is gone */
0133 static int
0134 dasd_eckd_probe (struct ccw_device *cdev)
0135 {
0136     int ret;
0137
0138     /* set ECKD specific ccw-device options */
0139     ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
0140                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
0141     if (ret) {
0142         DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
0143                 "dasd_eckd_probe: could not set "
0144                 "ccw-device options");
0145         return ret;
0146     }
0147     ret = dasd_generic_probe(cdev);
0148     return ret;
0149 }
0150
0151 static int
0152 dasd_eckd_set_online(struct ccw_device *cdev)
0153 {
0154     return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
0155 }
0156
0157 static const int sizes_trk0[] = { 28, 148, 84 };
0158 #define LABEL_SIZE 140
0159
0160 /* head and record addresses of count_area read in analysis ccw */
0161 static const int count_area_head[] = { 0, 0, 0, 0, 1 };
0162 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
0163
0164 static inline unsigned int
0165 ceil_quot(unsigned int d1, unsigned int d2)
0166 {
0167     return (d1 + (d2 - 1)) / d2;
0168 }
0169
0170 static unsigned int
0171 recs_per_track(struct dasd_eckd_characteristics * rdc,
0172            unsigned int kl, unsigned int dl)
0173 {
0174     int dn, kn;
0175
0176     switch (rdc->dev_type) {
0177     case 0x3380:
0178         if (kl)
0179             return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
0180                        ceil_quot(dl + 12, 32));
0181         else
0182             return 1499 / (15 + ceil_quot(dl + 12, 32));
0183     case 0x3390:
0184         dn = ceil_quot(dl + 6, 232) + 1;
0185         if (kl) {
0186             kn = ceil_quot(kl + 6, 232) + 1;
0187             return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
0188                        9 + ceil_quot(dl + 6 * dn, 34));
0189         } else
0190             return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
0191     case 0x9345:
0192         dn = ceil_quot(dl + 6, 232) + 1;
0193         if (kl) {
0194             kn = ceil_quot(kl + 6, 232) + 1;
0195             return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
0196                        ceil_quot(dl + 6 * dn, 34));
0197         } else
0198             return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
0199     }
0200     return 0;
0201 }
0202
0203 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
0204 {
0205     geo->cyl = (__u16) cyl;
0206     geo->head = cyl >> 16;
0207     geo->head <<= 4;
0208     geo->head |= head;
0209 }
0210
0211 /*
0212  * calculate failing track from sense data depending if
0213  * it is an EAV device or not
0214  */
0215 static int dasd_eckd_track_from_irb(struct irb *irb, struct dasd_device *device,
0216                     sector_t *track)
0217 {
0218     struct dasd_eckd_private *private = device->private;
0219     u8 *sense = NULL;
0220     u32 cyl;
0221     u8 head;
0222
0223     sense = dasd_get_sense(irb);
0224     if (!sense) {
0225         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
0226                   "ESE error no sense data\n");
0227         return -EINVAL;
0228     }
0229     if (!(sense[27] & DASD_SENSE_BIT_2)) {
0230         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
0231                   "ESE error no valid track data\n");
0232         return -EINVAL;
0233     }
0234
0235     if (sense[27] & DASD_SENSE_BIT_3) {
0236         /* enhanced addressing */
0237         cyl = sense[30] << 20;
0238         cyl |= (sense[31] & 0xF0) << 12;
0239         cyl |= sense[28] << 8;
0240         cyl |= sense[29];
0241     } else {
0242         cyl = sense[29] << 8;
0243         cyl |= sense[30];
0244     }
0245     head = sense[31] & 0x0F;
0246     *track = cyl * private->rdc_data.trk_per_cyl + head;
0247     return 0;
0248 }
0249
0250 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
0251              struct dasd_device *device)
0252 {
0253     struct dasd_eckd_private *private = device->private;
0254     int rc;
0255
0256     rc = get_phys_clock(&data->ep_sys_time);
0257     /*
0258      * Ignore return code if XRC is not supported or
0259      * sync clock is switched off
0260      */
0261     if ((rc && !private->rdc_data.facilities.XRC_supported) ||
0262         rc == -EOPNOTSUPP || rc == -EACCES)
0263         return 0;
0264
0265     /* switch on System Time Stamp - needed for XRC Support */
0266     data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
0267     data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
0268
0269     if (ccw) {
0270         ccw->count = sizeof(struct DE_eckd_data);
0271         ccw->flags |= CCW_FLAG_SLI;
0272     }
0273
0274     return rc;
0275 }
0276
0277 static int
0278 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
0279           unsigned int totrk, int cmd, struct dasd_device *device,
0280           int blksize)
0281 {
0282     struct dasd_eckd_private *private = device->private;
0283     u16 heads, beghead, endhead;
0284     u32 begcyl, endcyl;
0285     int rc = 0;
0286
0287     if (ccw) {
0288         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
0289         ccw->flags = 0;
0290         ccw->count = 16;
0291         ccw->cda = (__u32)__pa(data);
0292     }
0293
0294     memset(data, 0, sizeof(struct DE_eckd_data));
0295     switch (cmd) {
0296     case DASD_ECKD_CCW_READ_HOME_ADDRESS:
0297     case DASD_ECKD_CCW_READ_RECORD_ZERO:
0298     case DASD_ECKD_CCW_READ:
0299     case DASD_ECKD_CCW_READ_MT:
0300     case DASD_ECKD_CCW_READ_CKD:
0301     case DASD_ECKD_CCW_READ_CKD_MT:
0302     case DASD_ECKD_CCW_READ_KD:
0303     case DASD_ECKD_CCW_READ_KD_MT:
0304         data->mask.perm = 0x1;
0305         data->attributes.operation = private->attrib.operation;
0306         break;
0307     case DASD_ECKD_CCW_READ_COUNT:
0308         data->mask.perm = 0x1;
0309         data->attributes.operation = DASD_BYPASS_CACHE;
0310         break;
0311     case DASD_ECKD_CCW_READ_TRACK:
0312     case DASD_ECKD_CCW_READ_TRACK_DATA:
0313         data->mask.perm = 0x1;
0314         data->attributes.operation = private->attrib.operation;
0315         data->blk_size = 0;
0316         break;
0317     case DASD_ECKD_CCW_WRITE:
0318     case DASD_ECKD_CCW_WRITE_MT:
0319     case DASD_ECKD_CCW_WRITE_KD:
0320     case DASD_ECKD_CCW_WRITE_KD_MT:
0321         data->mask.perm = 0x02;
0322         data->attributes.operation = private->attrib.operation;
0323         rc = set_timestamp(ccw, data, device);
0324         break;
0325     case DASD_ECKD_CCW_WRITE_CKD:
0326     case DASD_ECKD_CCW_WRITE_CKD_MT:
0327         data->attributes.operation = DASD_BYPASS_CACHE;
0328         rc = set_timestamp(ccw, data, device);
0329         break;
0330     case DASD_ECKD_CCW_ERASE:
0331     case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
0332     case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
0333         data->mask.perm = 0x3;
0334         data->mask.auth = 0x1;
0335         data->attributes.operation = DASD_BYPASS_CACHE;
0336         rc = set_timestamp(ccw, data, device);
0337         break;
0338     case DASD_ECKD_CCW_WRITE_FULL_TRACK:
0339         data->mask.perm = 0x03;
0340         data->attributes.operation = private->attrib.operation;
0341         data->blk_size = 0;
0342         break;
0343     case DASD_ECKD_CCW_WRITE_TRACK_DATA:
0344         data->mask.perm = 0x02;
0345         data->attributes.operation = private->attrib.operation;
0346         data->blk_size = blksize;
0347         rc = set_timestamp(ccw, data, device);
0348         break;
0349     default:
0350         dev_err(&device->cdev->dev,
0351             "0x%x is not a known command\n", cmd);
0352         break;
0353     }
0354
0355     data->attributes.mode = 0x3;    /* ECKD */
0356
0357     if ((private->rdc_data.cu_type == 0x2105 ||
0358          private->rdc_data.cu_type == 0x2107 ||
0359          private->rdc_data.cu_type == 0x1750)
0360         && !(private->uses_cdl && trk < 2))
0361         data->ga_extended |= 0x40; /* Regular Data Format Mode */
0362
0363     heads = private->rdc_data.trk_per_cyl;
0364     begcyl = trk / heads;
0365     beghead = trk % heads;
0366     endcyl = totrk / heads;
0367     endhead = totrk % heads;
0368
0369     /* check for sequential prestage - enhance cylinder range */
0370     if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
0371         data->attributes.operation == DASD_SEQ_ACCESS) {
0372
0373         if (endcyl + private->attrib.nr_cyl < private->real_cyl)
0374             endcyl += private->attrib.nr_cyl;
0375         else
0376             endcyl = (private->real_cyl - 1);
0377     }
0378
0379     set_ch_t(&data->beg_ext, begcyl, beghead);
0380     set_ch_t(&data->end_ext, endcyl, endhead);
0381     return rc;
0382 }
0383
0384
0385 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
0386                   unsigned int trk, unsigned int rec_on_trk,
0387                   int count, int cmd, struct dasd_device *device,
0388                   unsigned int reclen, unsigned int tlf)
0389 {
0390     struct dasd_eckd_private *private = device->private;
0391     int sector;
0392     int dn, d;
0393
0394     if (ccw) {
0395         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
0396         ccw->flags = 0;
0397         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
0398             ccw->count = 22;
0399         else
0400             ccw->count = 20;
0401         ccw->cda = (__u32)__pa(data);
0402     }
0403
0404     memset(data, 0, sizeof(*data));
0405     sector = 0;
0406     if (rec_on_trk) {
0407         switch (private->rdc_data.dev_type) {
0408         case 0x3390:
0409             dn = ceil_quot(reclen + 6, 232);
0410             d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
0411             sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
0412             break;
0413         case 0x3380:
0414             d = 7 + ceil_quot(reclen + 12, 32);
0415             sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
0416             break;
0417         }
0418     }
0419     data->sector = sector;
0420     /* note: meaning of count depends on the operation
0421      *   for record based I/O it's the number of records, but for
0422      *   track based I/O it's the number of tracks
0423      */
0424     data->count = count;
0425     switch (cmd) {
0426     case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
0427         data->operation.orientation = 0x3;
0428         data->operation.operation = 0x03;
0429         break;
0430     case DASD_ECKD_CCW_READ_HOME_ADDRESS:
0431         data->operation.orientation = 0x3;
0432         data->operation.operation = 0x16;
0433         break;
0434     case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
0435         data->operation.orientation = 0x1;
0436         data->operation.operation = 0x03;
0437         data->count++;
0438         break;
0439     case DASD_ECKD_CCW_READ_RECORD_ZERO:
0440         data->operation.orientation = 0x3;
0441         data->operation.operation = 0x16;
0442         data->count++;
0443         break;
0444     case DASD_ECKD_CCW_WRITE:
0445     case DASD_ECKD_CCW_WRITE_MT:
0446     case DASD_ECKD_CCW_WRITE_KD:
0447     case DASD_ECKD_CCW_WRITE_KD_MT:
0448         data->auxiliary.length_valid = 0x1;
0449         data->length = reclen;
0450         data->operation.operation = 0x01;
0451         break;
0452     case DASD_ECKD_CCW_WRITE_CKD:
0453     case DASD_ECKD_CCW_WRITE_CKD_MT:
0454         data->auxiliary.length_valid = 0x1;
0455         data->length = reclen;
0456         data->operation.operation = 0x03;
0457         break;
0458     case DASD_ECKD_CCW_WRITE_FULL_TRACK:
0459         data->operation.orientation = 0x0;
0460         data->operation.operation = 0x3F;
0461         data->extended_operation = 0x11;
0462         data->length = 0;
0463         data->extended_parameter_length = 0x02;
0464         if (data->count > 8) {
0465             data->extended_parameter[0] = 0xFF;
0466             data->extended_parameter[1] = 0xFF;
0467             data->extended_parameter[1] <<= (16 - count);
0468         } else {
0469             data->extended_parameter[0] = 0xFF;
0470             data->extended_parameter[0] <<= (8 - count);
0471             data->extended_parameter[1] = 0x00;
0472         }
0473         data->sector = 0xFF;
0474         break;
0475     case DASD_ECKD_CCW_WRITE_TRACK_DATA:
0476         data->auxiliary.length_valid = 0x1;
0477         data->length = reclen;  /* not tlf, as one might think */
0478         data->operation.operation = 0x3F;
0479         data->extended_operation = 0x23;
0480         break;
0481     case DASD_ECKD_CCW_READ:
0482     case DASD_ECKD_CCW_READ_MT:
0483     case DASD_ECKD_CCW_READ_KD:
0484     case DASD_ECKD_CCW_READ_KD_MT:
0485         data->auxiliary.length_valid = 0x1;
0486         data->length = reclen;
0487         data->operation.operation = 0x06;
0488         break;
0489     case DASD_ECKD_CCW_READ_CKD:
0490     case DASD_ECKD_CCW_READ_CKD_MT:
0491         data->auxiliary.length_valid = 0x1;
0492         data->length = reclen;
0493         data->operation.operation = 0x16;
0494         break;
0495     case DASD_ECKD_CCW_READ_COUNT:
0496         data->operation.operation = 0x06;
0497         break;
0498     case DASD_ECKD_CCW_READ_TRACK:
0499         data->operation.orientation = 0x1;
0500         data->operation.operation = 0x0C;
0501         data->extended_parameter_length = 0;
0502         data->sector = 0xFF;
0503         break;
0504     case DASD_ECKD_CCW_READ_TRACK_DATA:
0505         data->auxiliary.length_valid = 0x1;
0506         data->length = tlf;
0507         data->operation.operation = 0x0C;
0508         break;
0509     case DASD_ECKD_CCW_ERASE:
0510         data->length = reclen;
0511         data->auxiliary.length_valid = 0x1;
0512         data->operation.operation = 0x0b;
0513         break;
0514     default:
0515         DBF_DEV_EVENT(DBF_ERR, device,
0516                 "fill LRE unknown opcode 0x%x", cmd);
0517         BUG();
0518     }
0519     set_ch_t(&data->seek_addr,
0520          trk / private->rdc_data.trk_per_cyl,
0521          trk % private->rdc_data.trk_per_cyl);
0522     data->search_arg.cyl = data->seek_addr.cyl;
0523     data->search_arg.head = data->seek_addr.head;
0524     data->search_arg.record = rec_on_trk;
0525 }
0526
0527 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
0528               unsigned int trk, unsigned int totrk, int cmd,
0529               struct dasd_device *basedev, struct dasd_device *startdev,
0530               unsigned int format, unsigned int rec_on_trk, int count,
0531               unsigned int blksize, unsigned int tlf)
0532 {
0533     struct dasd_eckd_private *basepriv, *startpriv;
0534     struct LRE_eckd_data *lredata;
0535     struct DE_eckd_data *dedata;
0536     int rc = 0;
0537
0538     basepriv = basedev->private;
0539     startpriv = startdev->private;
0540     dedata = &pfxdata->define_extent;
0541     lredata = &pfxdata->locate_record;
0542
0543     ccw->cmd_code = DASD_ECKD_CCW_PFX;
0544     ccw->flags = 0;
0545     if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
0546         ccw->count = sizeof(*pfxdata) + 2;
0547         ccw->cda = (__u32) __pa(pfxdata);
0548         memset(pfxdata, 0, sizeof(*pfxdata) + 2);
0549     } else {
0550         ccw->count = sizeof(*pfxdata);
0551         ccw->cda = (__u32) __pa(pfxdata);
0552         memset(pfxdata, 0, sizeof(*pfxdata));
0553     }
0554
0555     /* prefix data */
0556     if (format > 1) {
0557         DBF_DEV_EVENT(DBF_ERR, basedev,
0558                   "PFX LRE unknown format 0x%x", format);
0559         BUG();
0560         return -EINVAL;
0561     }
0562     pfxdata->format = format;
0563     pfxdata->base_address = basepriv->conf.ned->unit_addr;
0564     pfxdata->base_lss = basepriv->conf.ned->ID;
0565     pfxdata->validity.define_extent = 1;
0566
0567     /* private uid is kept up to date, conf_data may be outdated */
0568     if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
0569         pfxdata->validity.verify_base = 1;
0570
0571     if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
0572         pfxdata->validity.verify_base = 1;
0573         pfxdata->validity.hyper_pav = 1;
0574     }
0575
0576     rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
0577
0578     /*
0579      * For some commands the System Time Stamp is set in the define extent
0580      * data when XRC is supported. The validity of the time stamp must be
0581      * reflected in the prefix data as well.
0582      */
0583     if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
0584         pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid'   */
0585
0586     if (format == 1) {
0587         locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
0588                   basedev, blksize, tlf);
0589     }
0590
0591     return rc;
0592 }
0593
0594 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
0595           unsigned int trk, unsigned int totrk, int cmd,
0596           struct dasd_device *basedev, struct dasd_device *startdev)
0597 {
0598     return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
0599               0, 0, 0, 0, 0);
0600 }
0601
0602 static void
0603 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
0604           unsigned int rec_on_trk, int no_rec, int cmd,
0605           struct dasd_device * device, int reclen)
0606 {
0607     struct dasd_eckd_private *private = device->private;
0608     int sector;
0609     int dn, d;
0610
0611     DBF_DEV_EVENT(DBF_INFO, device,
0612           "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
0613           trk, rec_on_trk, no_rec, cmd, reclen);
0614
0615     ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
0616     ccw->flags = 0;
0617     ccw->count = 16;
0618     ccw->cda = (__u32) __pa(data);
0619
0620     memset(data, 0, sizeof(struct LO_eckd_data));
0621     sector = 0;
0622     if (rec_on_trk) {
0623         switch (private->rdc_data.dev_type) {
0624         case 0x3390:
0625             dn = ceil_quot(reclen + 6, 232);
0626             d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
0627             sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
0628             break;
0629         case 0x3380:
0630             d = 7 + ceil_quot(reclen + 12, 32);
0631             sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
0632             break;
0633         }
0634     }
0635     data->sector = sector;
0636     data->count = no_rec;
0637     switch (cmd) {
0638     case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
0639         data->operation.orientation = 0x3;
0640         data->operation.operation = 0x03;
0641         break;
0642     case DASD_ECKD_CCW_READ_HOME_ADDRESS:
0643         data->operation.orientation = 0x3;
0644         data->operation.operation = 0x16;
0645         break;
0646     case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
0647         data->operation.orientation = 0x1;
0648         data->operation.operation = 0x03;
0649         data->count++;
0650         break;
0651     case DASD_ECKD_CCW_READ_RECORD_ZERO:
0652         data->operation.orientation = 0x3;
0653         data->operation.operation = 0x16;
0654         data->count++;
0655         break;
0656     case DASD_ECKD_CCW_WRITE:
0657     case DASD_ECKD_CCW_WRITE_MT:
0658     case DASD_ECKD_CCW_WRITE_KD:
0659     case DASD_ECKD_CCW_WRITE_KD_MT:
0660         data->auxiliary.last_bytes_used = 0x1;
0661         data->length = reclen;
0662         data->operation.operation = 0x01;
0663         break;
0664     case DASD_ECKD_CCW_WRITE_CKD:
0665     case DASD_ECKD_CCW_WRITE_CKD_MT:
0666         data->auxiliary.last_bytes_used = 0x1;
0667         data->length = reclen;
0668         data->operation.operation = 0x03;
0669         break;
0670     case DASD_ECKD_CCW_READ:
0671     case DASD_ECKD_CCW_READ_MT:
0672     case DASD_ECKD_CCW_READ_KD:
0673     case DASD_ECKD_CCW_READ_KD_MT:
0674         data->auxiliary.last_bytes_used = 0x1;
0675         data->length = reclen;
0676         data->operation.operation = 0x06;
0677         break;
0678     case DASD_ECKD_CCW_READ_CKD:
0679     case DASD_ECKD_CCW_READ_CKD_MT:
0680         data->auxiliary.last_bytes_used = 0x1;
0681         data->length = reclen;
0682         data->operation.operation = 0x16;
0683         break;
0684     case DASD_ECKD_CCW_READ_COUNT:
0685         data->operation.operation = 0x06;
0686         break;
0687     case DASD_ECKD_CCW_ERASE:
0688         data->length = reclen;
0689         data->auxiliary.last_bytes_used = 0x1;
0690         data->operation.operation = 0x0b;
0691         break;
0692     default:
0693         DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
0694                   "opcode 0x%x", cmd);
0695     }
0696     set_ch_t(&data->seek_addr,
0697          trk / private->rdc_data.trk_per_cyl,
0698          trk % private->rdc_data.trk_per_cyl);
0699     data->search_arg.cyl = data->seek_addr.cyl;
0700     data->search_arg.head = data->seek_addr.head;
0701     data->search_arg.record = rec_on_trk;
0702 }
0703
0704 /*
0705  * Returns 1 if the block is one of the special blocks that needs
0706  * to get read/written with the KD variant of the command.
0707  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
0708  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
0709  * Luckily the KD variants differ only by one bit (0x08) from the
0710  * normal variant. So don't wonder about code like:
0711  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
0712  *         ccw->cmd_code |= 0x8;
0713  */
0714 static inline int
0715 dasd_eckd_cdl_special(int blk_per_trk, int recid)
0716 {
0717     if (recid < 3)
0718         return 1;
0719     if (recid < blk_per_trk)
0720         return 0;
0721     if (recid < 2 * blk_per_trk)
0722         return 1;
0723     return 0;
0724 }
0725
0726 /*
0727  * Returns the record size for the special blocks of the cdl format.
0728  * Only returns something useful if dasd_eckd_cdl_special is true
0729  * for the recid.
0730  */
0731 static inline int
0732 dasd_eckd_cdl_reclen(int recid)
0733 {
0734     if (recid < 3)
0735         return sizes_trk0[recid];
0736     return LABEL_SIZE;
0737 }
0738 /* create unique id from private structure. */
0739 static void create_uid(struct dasd_conf *conf, struct dasd_uid *uid)
0740 {
0741     int count;
0742
0743     memset(uid, 0, sizeof(struct dasd_uid));
0744     memcpy(uid->vendor, conf->ned->HDA_manufacturer,
0745            sizeof(uid->vendor) - 1);
0746     EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
0747     memcpy(uid->serial, &conf->ned->serial,
0748            sizeof(uid->serial) - 1);
0749     EBCASC(uid->serial, sizeof(uid->serial) - 1);
0750     uid->ssid = conf->gneq->subsystemID;
0751     uid->real_unit_addr = conf->ned->unit_addr;
0752     if (conf->sneq) {
0753         uid->type = conf->sneq->sua_flags;
0754         if (uid->type == UA_BASE_PAV_ALIAS)
0755             uid->base_unit_addr = conf->sneq->base_unit_addr;
0756     } else {
0757         uid->type = UA_BASE_DEVICE;
0758     }
0759     if (conf->vdsneq) {
0760         for (count = 0; count < 16; count++) {
0761             sprintf(uid->vduit+2*count, "%02x",
0762                 conf->vdsneq->uit[count]);
0763         }
0764     }
0765 }
0766
0767 /*
0768  * Generate device unique id that specifies the physical device.
0769  */
0770 static int dasd_eckd_generate_uid(struct dasd_device *device)
0771 {
0772     struct dasd_eckd_private *private = device->private;
0773     unsigned long flags;
0774
0775     if (!private)
0776         return -ENODEV;
0777     if (!private->conf.ned || !private->conf.gneq)
0778         return -ENODEV;
0779     spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
0780     create_uid(&private->conf, &private->uid);
0781     spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
0782     return 0;
0783 }
0784
0785 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
0786 {
0787     struct dasd_eckd_private *private = device->private;
0788     unsigned long flags;
0789
0790     if (private) {
0791         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
0792         *uid = private->uid;
0793         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
0794         return 0;
0795     }
0796     return -EINVAL;
0797 }
0798
0799 /*
0800  * compare device UID with data of a given dasd_eckd_private structure
0801  * return 0 for match
0802  */
0803 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
0804                       struct dasd_conf *path_conf)
0805 {
0806     struct dasd_uid device_uid;
0807     struct dasd_uid path_uid;
0808
0809     create_uid(path_conf, &path_uid);
0810     dasd_eckd_get_uid(device, &device_uid);
0811
0812     return memcmp(&device_uid, &path_uid, sizeof(struct dasd_uid));
0813 }
0814
0815 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
0816                    struct dasd_ccw_req *cqr,
0817                    __u8 *rcd_buffer,
0818                    __u8 lpm)
0819 {
0820     struct ccw1 *ccw;
0821     /*
0822      * buffer has to start with EBCDIC "V1.0" to show
0823      * support for virtual device SNEQ
0824      */
0825     rcd_buffer[0] = 0xE5;
0826     rcd_buffer[1] = 0xF1;
0827     rcd_buffer[2] = 0x4B;
0828     rcd_buffer[3] = 0xF0;
0829
0830     ccw = cqr->cpaddr;
0831     ccw->cmd_code = DASD_ECKD_CCW_RCD;
0832     ccw->flags = 0;
0833     ccw->cda = (__u32)(addr_t)rcd_buffer;
0834     ccw->count = DASD_ECKD_RCD_DATA_SIZE;
0835     cqr->magic = DASD_ECKD_MAGIC;
0836
0837     cqr->startdev = device;
0838     cqr->memdev = device;
0839     cqr->block = NULL;
0840     cqr->expires = 10*HZ;
0841     cqr->lpm = lpm;
0842     cqr->retries = 256;
0843     cqr->buildclk = get_tod_clock();
0844     cqr->status = DASD_CQR_FILLED;
0845     set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
0846 }
0847
0848 /*
0849  * Wakeup helper for read_conf
0850  * if the cqr is not done and needs some error recovery
0851  * the buffer has to be re-initialized with the EBCDIC "V1.0"
0852  * to show support for virtual device SNEQ
0853  */
0854 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
0855 {
0856     struct ccw1 *ccw;
0857     __u8 *rcd_buffer;
0858
0859     if (cqr->status !=  DASD_CQR_DONE) {
0860         ccw = cqr->cpaddr;
0861         rcd_buffer = (__u8 *)((addr_t) ccw->cda);
0862         memset(rcd_buffer, 0, sizeof(*rcd_buffer));
0863
0864         rcd_buffer[0] = 0xE5;
0865         rcd_buffer[1] = 0xF1;
0866         rcd_buffer[2] = 0x4B;
0867         rcd_buffer[3] = 0xF0;
0868     }
0869     dasd_wakeup_cb(cqr, data);
0870 }
0871
0872 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
0873                        struct dasd_ccw_req *cqr,
0874                        __u8 *rcd_buffer,
0875                        __u8 lpm)
0876 {
0877     struct ciw *ciw;
0878     int rc;
0879     /*
0880      * sanity check: scan for RCD command in extended SenseID data
0881      * some devices do not support RCD
0882      */
0883     ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
0884     if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
0885         return -EOPNOTSUPP;
0886
0887     dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
0888     clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
0889     set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
0890     cqr->retries = 5;
0891     cqr->callback = read_conf_cb;
0892     rc = dasd_sleep_on_immediatly(cqr);
0893     return rc;
0894 }
0895
0896 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
0897                    void **rcd_buffer,
0898                    int *rcd_buffer_size, __u8 lpm)
0899 {
0900     struct ciw *ciw;
0901     char *rcd_buf = NULL;
0902     int ret;
0903     struct dasd_ccw_req *cqr;
0904
0905     /*
0906      * sanity check: scan for RCD command in extended SenseID data
0907      * some devices do not support RCD
0908      */
0909     ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
0910     if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
0911         ret = -EOPNOTSUPP;
0912         goto out_error;
0913     }
0914     rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
0915     if (!rcd_buf) {
0916         ret = -ENOMEM;
0917         goto out_error;
0918     }
0919     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
0920                    0, /* use rcd_buf as data ara */
0921                    device, NULL);
0922     if (IS_ERR(cqr)) {
0923         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
0924                   "Could not allocate RCD request");
0925         ret = -ENOMEM;
0926         goto out_error;
0927     }
0928     dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
0929     cqr->callback = read_conf_cb;
0930     ret = dasd_sleep_on(cqr);
0931     /*
0932      * on success we update the user input parms
0933      */
0934     dasd_sfree_request(cqr, cqr->memdev);
0935     if (ret)
0936         goto out_error;
0937
0938     *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
0939     *rcd_buffer = rcd_buf;
0940     return 0;
0941 out_error:
0942     kfree(rcd_buf);
0943     *rcd_buffer = NULL;
0944     *rcd_buffer_size = 0;
0945     return ret;
0946 }
0947
0948 static int dasd_eckd_identify_conf_parts(struct dasd_conf *conf)
0949 {
0950
0951     struct dasd_sneq *sneq;
0952     int i, count;
0953
0954     conf->ned = NULL;
0955     conf->sneq = NULL;
0956     conf->vdsneq = NULL;
0957     conf->gneq = NULL;
0958     count = conf->len / sizeof(struct dasd_sneq);
0959     sneq = (struct dasd_sneq *)conf->data;
0960     for (i = 0; i < count; ++i) {
0961         if (sneq->flags.identifier == 1 && sneq->format == 1)
0962             conf->sneq = sneq;
0963         else if (sneq->flags.identifier == 1 && sneq->format == 4)
0964             conf->vdsneq = (struct vd_sneq *)sneq;
0965         else if (sneq->flags.identifier == 2)
0966             conf->gneq = (struct dasd_gneq *)sneq;
0967         else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
0968             conf->ned = (struct dasd_ned *)sneq;
0969         sneq++;
0970     }
0971     if (!conf->ned || !conf->gneq) {
0972         conf->ned = NULL;
0973         conf->sneq = NULL;
0974         conf->vdsneq = NULL;
0975         conf->gneq = NULL;
0976         return -EINVAL;
0977     }
0978     return 0;
0979
0980 };
0981
0982 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
0983 {
0984     struct dasd_gneq *gneq;
0985     int i, count, found;
0986
0987     count = conf_len / sizeof(*gneq);
0988     gneq = (struct dasd_gneq *)conf_data;
0989     found = 0;
0990     for (i = 0; i < count; ++i) {
0991         if (gneq->flags.identifier == 2) {
0992             found = 1;
0993             break;
0994         }
0995         gneq++;
0996     }
0997     if (found)
0998         return ((char *)gneq)[18] & 0x07;
0999     else
1000         return 0;
1001 }
1002
1003 static void dasd_eckd_store_conf_data(struct dasd_device *device,
1004                       struct dasd_conf_data *conf_data, int chp)
1005 {
1006     struct dasd_eckd_private *private = device->private;
1007     struct channel_path_desc_fmt0 *chp_desc;
1008     struct subchannel_id sch_id;
1009     void *cdp;
1010
1011     /*
1012      * path handling and read_conf allocate data
1013      * free it before replacing the pointer
1014      * also replace the old private->conf_data pointer
1015      * with the new one if this points to the same data
1016      */
1017     cdp = device->path[chp].conf_data;
1018     if (private->conf.data == cdp) {
1019         private->conf.data = (void *)conf_data;
1020         dasd_eckd_identify_conf_parts(&private->conf);
1021     }
1022     ccw_device_get_schid(device->cdev, &sch_id);
1023     device->path[chp].conf_data = conf_data;
1024     device->path[chp].cssid = sch_id.cssid;
1025     device->path[chp].ssid = sch_id.ssid;
1026     chp_desc = ccw_device_get_chp_desc(device->cdev, chp);
1027     if (chp_desc)
1028         device->path[chp].chpid = chp_desc->chpid;
1029     kfree(chp_desc);
1030     kfree(cdp);
1031 }
1032
1033 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1034 {
1035     struct dasd_eckd_private *private = device->private;
1036     int i;
1037
1038     private->conf.data = NULL;
1039     private->conf.len = 0;
1040     for (i = 0; i < 8; i++) {
1041         kfree(device->path[i].conf_data);
1042         device->path[i].conf_data = NULL;
1043         device->path[i].cssid = 0;
1044         device->path[i].ssid = 0;
1045         device->path[i].chpid = 0;
1046         dasd_path_notoper(device, i);
1047     }
1048 }
1049
1050 static void dasd_eckd_read_fc_security(struct dasd_device *device)
1051 {
1052     struct dasd_eckd_private *private = device->private;
1053     u8 esm_valid;
1054     u8 esm[8];
1055     int chp;
1056     int rc;
1057
1058     rc = chsc_scud(private->uid.ssid, (u64 *)esm, &esm_valid);
1059     if (rc) {
1060         for (chp = 0; chp < 8; chp++)
1061             device->path[chp].fc_security = 0;
1062         return;
1063     }
1064
1065     for (chp = 0; chp < 8; chp++) {
1066         if (esm_valid & (0x80 >> chp))
1067             device->path[chp].fc_security = esm[chp];
1068         else
1069             device->path[chp].fc_security = 0;
1070     }
1071 }
1072
1073 static void dasd_eckd_get_uid_string(struct dasd_conf *conf,
1074                      char *print_uid)
1075 {
1076     struct dasd_uid uid;
1077
1078     create_uid(conf, &uid);
1079     if (strlen(uid.vduit) > 0)
1080         snprintf(print_uid, sizeof(*print_uid),
1081              "%s.%s.%04x.%02x.%s",
1082              uid.vendor, uid.serial, uid.ssid,
1083              uid.real_unit_addr, uid.vduit);
1084     else
1085         snprintf(print_uid, sizeof(*print_uid),
1086              "%s.%s.%04x.%02x",
1087              uid.vendor, uid.serial, uid.ssid,
1088              uid.real_unit_addr);
1089 }
1090
1091 static int dasd_eckd_check_cabling(struct dasd_device *device,
1092                    void *conf_data, __u8 lpm)
1093 {
1094     struct dasd_eckd_private *private = device->private;
1095     char print_path_uid[60], print_device_uid[60];
1096     struct dasd_conf path_conf;
1097
1098     path_conf.data = conf_data;
1099     path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1100     if (dasd_eckd_identify_conf_parts(&path_conf))
1101         return 1;
1102
1103     if (dasd_eckd_compare_path_uid(device, &path_conf)) {
1104         dasd_eckd_get_uid_string(&path_conf, print_path_uid);
1105         dasd_eckd_get_uid_string(&private->conf, print_device_uid);
1106         dev_err(&device->cdev->dev,
1107             "Not all channel paths lead to the same device, path %02X leads to device %s instead of %s\n",
1108             lpm, print_path_uid, print_device_uid);
1109         return 1;
1110     }
1111
1112     return 0;
1113 }
1114
1115 static int dasd_eckd_read_conf(struct dasd_device *device)
1116 {
1117     void *conf_data;
1118     int conf_len, conf_data_saved;
1119     int rc, path_err, pos;
1120     __u8 lpm, opm;
1121     struct dasd_eckd_private *private;
1122
1123     private = device->private;
1124     opm = ccw_device_get_path_mask(device->cdev);
1125     conf_data_saved = 0;
1126     path_err = 0;
1127     /* get configuration data per operational path */
1128     for (lpm = 0x80; lpm; lpm>>= 1) {
1129         if (!(lpm & opm))
1130             continue;
1131         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1132                          &conf_len, lpm);
1133         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1134             DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1135                     "Read configuration data returned "
1136                     "error %d", rc);
1137             return rc;
1138         }
1139         if (conf_data == NULL) {
1140             DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1141                     "No configuration data "
1142                     "retrieved");
1143             /* no further analysis possible */
1144             dasd_path_add_opm(device, opm);
1145             continue;   /* no error */
1146         }
1147         /* save first valid configuration data */
1148         if (!conf_data_saved) {
1149             /* initially clear previously stored conf_data */
1150             dasd_eckd_clear_conf_data(device);
1151             private->conf.data = conf_data;
1152             private->conf.len = conf_len;
1153             if (dasd_eckd_identify_conf_parts(&private->conf)) {
1154                 private->conf.data = NULL;
1155                 private->conf.len = 0;
1156                 kfree(conf_data);
1157                 continue;
1158             }
1159             /*
1160              * build device UID that other path data
1161              * can be compared to it
1162              */
1163             dasd_eckd_generate_uid(device);
1164             conf_data_saved++;
1165         } else if (dasd_eckd_check_cabling(device, conf_data, lpm)) {
1166             dasd_path_add_cablepm(device, lpm);
1167             path_err = -EINVAL;
1168             kfree(conf_data);
1169             continue;
1170         }
1171
1172         pos = pathmask_to_pos(lpm);
1173         dasd_eckd_store_conf_data(device, conf_data, pos);
1174
1175         switch (dasd_eckd_path_access(conf_data, conf_len)) {
1176         case 0x02:
1177             dasd_path_add_nppm(device, lpm);
1178             break;
1179         case 0x03:
1180             dasd_path_add_ppm(device, lpm);
1181             break;
1182         }
1183         if (!dasd_path_get_opm(device)) {
1184             dasd_path_set_opm(device, lpm);
1185             dasd_generic_path_operational(device);
1186         } else {
1187             dasd_path_add_opm(device, lpm);
1188         }
1189     }
1190
1191     return path_err;
1192 }
1193
1194 static u32 get_fcx_max_data(struct dasd_device *device)
1195 {
1196     struct dasd_eckd_private *private = device->private;
1197     int fcx_in_css, fcx_in_gneq, fcx_in_features;
1198     unsigned int mdc;
1199     int tpm;
1200
1201     if (dasd_nofcx)
1202         return 0;
1203     /* is transport mode supported? */
1204     fcx_in_css = css_general_characteristics.fcx;
1205     fcx_in_gneq = private->conf.gneq->reserved2[7] & 0x04;
1206     fcx_in_features = private->features.feature[40] & 0x80;
1207     tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1208
1209     if (!tpm)
1210         return 0;
1211
1212     mdc = ccw_device_get_mdc(device->cdev, 0);
1213     if (mdc == 0) {
1214         dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1215         return 0;
1216     } else {
1217         return (u32)mdc * FCX_MAX_DATA_FACTOR;
1218     }
1219 }
1220
1221 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1222 {
1223     struct dasd_eckd_private *private = device->private;
1224     unsigned int mdc;
1225     u32 fcx_max_data;
1226
1227     if (private->fcx_max_data) {
1228         mdc = ccw_device_get_mdc(device->cdev, lpm);
1229         if (mdc == 0) {
1230             dev_warn(&device->cdev->dev,
1231                  "Detecting the maximum data size for zHPF "
1232                  "requests failed (rc=%d) for a new path %x\n",
1233                  mdc, lpm);
1234             return mdc;
1235         }
1236         fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1237         if (fcx_max_data < private->fcx_max_data) {
1238             dev_warn(&device->cdev->dev,
1239                  "The maximum data size for zHPF requests %u "
1240                  "on a new path %x is below the active maximum "
1241                  "%u\n", fcx_max_data, lpm,
1242                  private->fcx_max_data);
1243             return -EACCES;
1244         }
1245     }
1246     return 0;
1247 }
1248
1249 static int rebuild_device_uid(struct dasd_device *device,
1250                   struct pe_handler_work_data *data)
1251 {
1252     struct dasd_eckd_private *private = device->private;
1253     __u8 lpm, opm = dasd_path_get_opm(device);
1254     int rc = -ENODEV;
1255
1256     for (lpm = 0x80; lpm; lpm >>= 1) {
1257         if (!(lpm & opm))
1258             continue;
1259         memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1260         memset(&data->cqr, 0, sizeof(data->cqr));
1261         data->cqr.cpaddr = &data->ccw;
1262         rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1263                              data->rcd_buffer,
1264                              lpm);
1265
1266         if (rc) {
1267             if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1268                 continue;
1269             DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1270                     "Read configuration data "
1271                     "returned error %d", rc);
1272             break;
1273         }
1274         memcpy(private->conf.data, data->rcd_buffer,
1275                DASD_ECKD_RCD_DATA_SIZE);
1276         if (dasd_eckd_identify_conf_parts(&private->conf)) {
1277             rc = -ENODEV;
1278         } else /* first valid path is enough */
1279             break;
1280     }
1281
1282     if (!rc)
1283         rc = dasd_eckd_generate_uid(device);
1284
1285     return rc;
1286 }
1287
1288 static void dasd_eckd_path_available_action(struct dasd_device *device,
1289                         struct pe_handler_work_data *data)
1290 {
1291     __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1292     __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1293     struct dasd_conf_data *conf_data;
1294     struct dasd_conf path_conf;
1295     unsigned long flags;
1296     char print_uid[60];
1297     int rc, pos;
1298
1299     opm = 0;
1300     npm = 0;
1301     ppm = 0;
1302     epm = 0;
1303     hpfpm = 0;
1304     cablepm = 0;
1305
1306     for (lpm = 0x80; lpm; lpm >>= 1) {
1307         if (!(lpm & data->tbvpm))
1308             continue;
1309         memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1310         memset(&data->cqr, 0, sizeof(data->cqr));
1311         data->cqr.cpaddr = &data->ccw;
1312         rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1313                              data->rcd_buffer,
1314                              lpm);
1315         if (!rc) {
1316             switch (dasd_eckd_path_access(data->rcd_buffer,
1317                               DASD_ECKD_RCD_DATA_SIZE)
1318                 ) {
1319             case 0x02:
1320                 npm |= lpm;
1321                 break;
1322             case 0x03:
1323                 ppm |= lpm;
1324                 break;
1325             }
1326             opm |= lpm;
1327         } else if (rc == -EOPNOTSUPP) {
1328             DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1329                     "path verification: No configuration "
1330                     "data retrieved");
1331             opm |= lpm;
1332         } else if (rc == -EAGAIN) {
1333             DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1334                     "path verification: device is stopped,"
1335                     " try again later");
1336             epm |= lpm;
1337         } else {
1338             dev_warn(&device->cdev->dev,
1339                  "Reading device feature codes failed "
1340                  "(rc=%d) for new path %x\n", rc, lpm);
1341             continue;
1342         }
1343         if (verify_fcx_max_data(device, lpm)) {
1344             opm &= ~lpm;
1345             npm &= ~lpm;
1346             ppm &= ~lpm;
1347             hpfpm |= lpm;
1348             continue;
1349         }
1350
1351         /*
1352          * save conf_data for comparison after
1353          * rebuild_device_uid may have changed
1354          * the original data
1355          */
1356         memcpy(&path_rcd_buf, data->rcd_buffer,
1357                DASD_ECKD_RCD_DATA_SIZE);
1358         path_conf.data = (void *)&path_rcd_buf;
1359         path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1360         if (dasd_eckd_identify_conf_parts(&path_conf)) {
1361             path_conf.data = NULL;
1362             path_conf.len = 0;
1363             continue;
1364         }
1365
1366         /*
1367          * compare path UID with device UID only if at least
1368          * one valid path is left
1369          * in other case the device UID may have changed and
1370          * the first working path UID will be used as device UID
1371          */
1372         if (dasd_path_get_opm(device) &&
1373             dasd_eckd_compare_path_uid(device, &path_conf)) {
1374             /*
1375              * the comparison was not successful
1376              * rebuild the device UID with at least one
1377              * known path in case a z/VM hyperswap command
1378              * has changed the device
1379              *
1380              * after this compare again
1381              *
1382              * if either the rebuild or the recompare fails
1383              * the path can not be used
1384              */
1385             if (rebuild_device_uid(device, data) ||
1386                 dasd_eckd_compare_path_uid(
1387                     device, &path_conf)) {
1388                 dasd_eckd_get_uid_string(&path_conf, print_uid);
1389                 dev_err(&device->cdev->dev,
1390                     "The newly added channel path %02X "
1391                     "will not be used because it leads "
1392                     "to a different device %s\n",
1393                     lpm, print_uid);
1394                 opm &= ~lpm;
1395                 npm &= ~lpm;
1396                 ppm &= ~lpm;
1397                 cablepm |= lpm;
1398                 continue;
1399             }
1400         }
1401
1402         conf_data = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL);
1403         if (conf_data) {
1404             memcpy(conf_data, data->rcd_buffer,
1405                    DASD_ECKD_RCD_DATA_SIZE);
1406         } else {
1407             /*
1408              * path is operational but path config data could not
1409              * be stored due to low mem condition
1410              * add it to the error path mask and schedule a path
1411              * verification later that this could be added again
1412              */
1413             epm |= lpm;
1414         }
1415         pos = pathmask_to_pos(lpm);
1416         dasd_eckd_store_conf_data(device, conf_data, pos);
1417
1418         /*
1419          * There is a small chance that a path is lost again between
1420          * above path verification and the following modification of
1421          * the device opm mask. We could avoid that race here by using
1422          * yet another path mask, but we rather deal with this unlikely
1423          * situation in dasd_start_IO.
1424          */
1425         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1426         if (!dasd_path_get_opm(device) && opm) {
1427             dasd_path_set_opm(device, opm);
1428             dasd_generic_path_operational(device);
1429         } else {
1430             dasd_path_add_opm(device, opm);
1431         }
1432         dasd_path_add_nppm(device, npm);
1433         dasd_path_add_ppm(device, ppm);
1434         if (epm) {
1435             dasd_path_add_tbvpm(device, epm);
1436             dasd_device_set_timer(device, 50);
1437         }
1438         dasd_path_add_cablepm(device, cablepm);
1439         dasd_path_add_nohpfpm(device, hpfpm);
1440         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1441
1442         dasd_path_create_kobj(device, pos);
1443     }
1444 }
1445
1446 static void do_pe_handler_work(struct work_struct *work)
1447 {
1448     struct pe_handler_work_data *data;
1449     struct dasd_device *device;
1450
1451     data = container_of(work, struct pe_handler_work_data, worker);
1452     device = data->device;
1453
1454     /* delay path verification until device was resumed */
1455     if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1456         schedule_work(work);
1457         return;
1458     }
1459     /* check if path verification already running and delay if so */
1460     if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1461         schedule_work(work);
1462         return;
1463     }
1464
1465     if (data->tbvpm)
1466         dasd_eckd_path_available_action(device, data);
1467     if (data->fcsecpm)
1468         dasd_eckd_read_fc_security(device);
1469
1470     clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1471     dasd_put_device(device);
1472     if (data->isglobal)
1473         mutex_unlock(&dasd_pe_handler_mutex);
1474     else
1475         kfree(data);
1476 }
1477
1478 static int dasd_eckd_pe_handler(struct dasd_device *device,
1479                 __u8 tbvpm, __u8 fcsecpm)
1480 {
1481     struct pe_handler_work_data *data;
1482
1483     data = kzalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1484     if (!data) {
1485         if (mutex_trylock(&dasd_pe_handler_mutex)) {
1486             data = pe_handler_worker;
1487             data->isglobal = 1;
1488         } else {
1489             return -ENOMEM;
1490         }
1491     }
1492     INIT_WORK(&data->worker, do_pe_handler_work);
1493     dasd_get_device(device);
1494     data->device = device;
1495     data->tbvpm = tbvpm;
1496     data->fcsecpm = fcsecpm;
1497     schedule_work(&data->worker);
1498     return 0;
1499 }
1500
1501 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1502 {
1503     struct dasd_eckd_private *private = device->private;
1504     unsigned long flags;
1505
1506     if (!private->fcx_max_data)
1507         private->fcx_max_data = get_fcx_max_data(device);
1508     spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1509     dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1510     dasd_schedule_device_bh(device);
1511     spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1512 }
1513
1514 static int dasd_eckd_read_features(struct dasd_device *device)
1515 {
1516     struct dasd_eckd_private *private = device->private;
1517     struct dasd_psf_prssd_data *prssdp;
1518     struct dasd_rssd_features *features;
1519     struct dasd_ccw_req *cqr;
1520     struct ccw1 *ccw;
1521     int rc;
1522
1523     memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1524     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1525                    (sizeof(struct dasd_psf_prssd_data) +
1526                     sizeof(struct dasd_rssd_features)),
1527                    device, NULL);
1528     if (IS_ERR(cqr)) {
1529         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1530                 "allocate initialization request");
1531         return PTR_ERR(cqr);
1532     }
1533     cqr->startdev = device;
1534     cqr->memdev = device;
1535     cqr->block = NULL;
1536     cqr->retries = 256;
1537     cqr->expires = 10 * HZ;
1538
1539     /* Prepare for Read Subsystem Data */
1540     prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1541     memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1542     prssdp->order = PSF_ORDER_PRSSD;
1543     prssdp->suborder = 0x41;    /* Read Feature Codes */
1544     /* all other bytes of prssdp must be zero */
1545
1546     ccw = cqr->cpaddr;
1547     ccw->cmd_code = DASD_ECKD_CCW_PSF;
1548     ccw->count = sizeof(struct dasd_psf_prssd_data);
1549     ccw->flags |= CCW_FLAG_CC;
1550     ccw->cda = (__u32)(addr_t) prssdp;
1551
1552     /* Read Subsystem Data - feature codes */
1553     features = (struct dasd_rssd_features *) (prssdp + 1);
1554     memset(features, 0, sizeof(struct dasd_rssd_features));
1555
1556     ccw++;
1557     ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1558     ccw->count = sizeof(struct dasd_rssd_features);
1559     ccw->cda = (__u32)(addr_t) features;
1560
1561     cqr->buildclk = get_tod_clock();
1562     cqr->status = DASD_CQR_FILLED;
1563     rc = dasd_sleep_on(cqr);
1564     if (rc == 0) {
1565         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1566         features = (struct dasd_rssd_features *) (prssdp + 1);
1567         memcpy(&private->features, features,
1568                sizeof(struct dasd_rssd_features));
1569     } else
1570         dev_warn(&device->cdev->dev, "Reading device feature codes"
1571              " failed with rc=%d\n", rc);
1572     dasd_sfree_request(cqr, cqr->memdev);
1573     return rc;
1574 }
1575
1576 /* Read Volume Information - Volume Storage Query */
1577 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1578 {
1579     struct dasd_eckd_private *private = device->private;
1580     struct dasd_psf_prssd_data *prssdp;
1581     struct dasd_rssd_vsq *vsq;
1582     struct dasd_ccw_req *cqr;
1583     struct ccw1 *ccw;
1584     int useglobal;
1585     int rc;
1586
1587     /* This command cannot be executed on an alias device */
1588     if (private->uid.type == UA_BASE_PAV_ALIAS ||
1589         private->uid.type == UA_HYPER_PAV_ALIAS)
1590         return 0;
1591
1592     useglobal = 0;
1593     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1594                    sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1595     if (IS_ERR(cqr)) {
1596         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1597                 "Could not allocate initialization request");
1598         mutex_lock(&dasd_vol_info_mutex);
1599         useglobal = 1;
1600         cqr = &dasd_vol_info_req->cqr;
1601         memset(cqr, 0, sizeof(*cqr));
1602         memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1603         cqr->cpaddr = &dasd_vol_info_req->ccw;
1604         cqr->data = &dasd_vol_info_req->data;
1605         cqr->magic = DASD_ECKD_MAGIC;
1606     }
1607
1608     /* Prepare for Read Subsystem Data */
1609     prssdp = cqr->data;
1610     prssdp->order = PSF_ORDER_PRSSD;
1611     prssdp->suborder = PSF_SUBORDER_VSQ;    /* Volume Storage Query */
1612     prssdp->lss = private->conf.ned->ID;
1613     prssdp->volume = private->conf.ned->unit_addr;
1614
1615     ccw = cqr->cpaddr;
1616     ccw->cmd_code = DASD_ECKD_CCW_PSF;
1617     ccw->count = sizeof(*prssdp);
1618     ccw->flags |= CCW_FLAG_CC;
1619     ccw->cda = (__u32)(addr_t)prssdp;
1620
1621     /* Read Subsystem Data - Volume Storage Query */
1622     vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1623     memset(vsq, 0, sizeof(*vsq));
1624
1625     ccw++;
1626     ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1627     ccw->count = sizeof(*vsq);
1628     ccw->flags |= CCW_FLAG_SLI;
1629     ccw->cda = (__u32)(addr_t)vsq;
1630
1631     cqr->buildclk = get_tod_clock();
1632     cqr->status = DASD_CQR_FILLED;
1633     cqr->startdev = device;
1634     cqr->memdev = device;
1635     cqr->block = NULL;
1636     cqr->retries = 256;
1637     cqr->expires = device->default_expires * HZ;
1638     /* The command might not be supported. Suppress the error output */
1639     __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1640
1641     rc = dasd_sleep_on_interruptible(cqr);
1642     if (rc == 0) {
1643         memcpy(&private->vsq, vsq, sizeof(*vsq));
1644     } else {
1645         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1646                 "Reading the volume storage information failed with rc=%d", rc);
1647     }
1648
1649     if (useglobal)
1650         mutex_unlock(&dasd_vol_info_mutex);
1651     else
1652         dasd_sfree_request(cqr, cqr->memdev);
1653
1654     return rc;
1655 }
1656
1657 static int dasd_eckd_is_ese(struct dasd_device *device)
1658 {
1659     struct dasd_eckd_private *private = device->private;
1660
1661     return private->vsq.vol_info.ese;
1662 }
1663
1664 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1665 {
1666     struct dasd_eckd_private *private = device->private;
1667
1668     return private->vsq.extent_pool_id;
1669 }
1670
1671 /*
1672  * This value represents the total amount of available space. As more space is
1673  * allocated by ESE volumes, this value will decrease.
1674  * The data for this value is therefore updated on any call.
1675  */
1676 static int dasd_eckd_space_configured(struct dasd_device *device)
1677 {
1678     struct dasd_eckd_private *private = device->private;
1679     int rc;
1680
1681     rc = dasd_eckd_read_vol_info(device);
1682
1683     return rc ? : private->vsq.space_configured;
1684 }
1685
1686 /*
1687  * The value of space allocated by an ESE volume may have changed and is
1688  * therefore updated on any call.
1689  */
1690 static int dasd_eckd_space_allocated(struct dasd_device *device)
1691 {
1692     struct dasd_eckd_private *private = device->private;
1693     int rc;
1694
1695     rc = dasd_eckd_read_vol_info(device);
1696
1697     return rc ? : private->vsq.space_allocated;
1698 }
1699
1700 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1701 {
1702     struct dasd_eckd_private *private = device->private;
1703
1704     return private->vsq.logical_capacity;
1705 }
1706
1707 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1708 {
1709     struct ext_pool_exhaust_work_data *data;
1710     struct dasd_device *device;
1711     struct dasd_device *base;
1712
1713     data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1714     device = data->device;
1715     base = data->base;
1716
1717     if (!base)
1718         base = device;
1719     if (dasd_eckd_space_configured(base) != 0) {
1720         dasd_generic_space_avail(device);
1721     } else {
1722         dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1723         DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1724     }
1725
1726     dasd_put_device(device);
1727     kfree(data);
1728 }
1729
1730 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1731                       struct dasd_ccw_req *cqr)
1732 {
1733     struct ext_pool_exhaust_work_data *data;
1734
1735     data = kzalloc(sizeof(*data), GFP_ATOMIC);
1736     if (!data)
1737         return -ENOMEM;
1738     INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1739     dasd_get_device(device);
1740     data->device = device;
1741
1742     if (cqr->block)
1743         data->base = cqr->block->base;
1744     else if (cqr->basedev)
1745         data->base = cqr->basedev;
1746     else
1747         data->base = NULL;
1748
1749     schedule_work(&data->worker);
1750
1751     return 0;
1752 }
1753
1754 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1755                     struct dasd_rssd_lcq *lcq)
1756 {
1757     struct dasd_eckd_private *private = device->private;
1758     int pool_id = dasd_eckd_ext_pool_id(device);
1759     struct dasd_ext_pool_sum eps;
1760     int i;
1761
1762     for (i = 0; i < lcq->pool_count; i++) {
1763         eps = lcq->ext_pool_sum[i];
1764         if (eps.pool_id == pool_id) {
1765             memcpy(&private->eps, &eps,
1766                    sizeof(struct dasd_ext_pool_sum));
1767         }
1768     }
1769 }
1770
1771 /* Read Extent Pool Information - Logical Configuration Query */
1772 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1773 {
1774     struct dasd_eckd_private *private = device->private;
1775     struct dasd_psf_prssd_data *prssdp;
1776     struct dasd_rssd_lcq *lcq;
1777     struct dasd_ccw_req *cqr;
1778     struct ccw1 *ccw;
1779     int rc;
1780
1781     /* This command cannot be executed on an alias device */
1782     if (private->uid.type == UA_BASE_PAV_ALIAS ||
1783         private->uid.type == UA_HYPER_PAV_ALIAS)
1784         return 0;
1785
1786     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1787                    sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1788     if (IS_ERR(cqr)) {
1789         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1790                 "Could not allocate initialization request");
1791         return PTR_ERR(cqr);
1792     }
1793
1794     /* Prepare for Read Subsystem Data */
1795     prssdp = cqr->data;
1796     memset(prssdp, 0, sizeof(*prssdp));
1797     prssdp->order = PSF_ORDER_PRSSD;
1798     prssdp->suborder = PSF_SUBORDER_LCQ;    /* Logical Configuration Query */
1799
1800     ccw = cqr->cpaddr;
1801     ccw->cmd_code = DASD_ECKD_CCW_PSF;
1802     ccw->count = sizeof(*prssdp);
1803     ccw->flags |= CCW_FLAG_CC;
1804     ccw->cda = (__u32)(addr_t)prssdp;
1805
1806     lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1807     memset(lcq, 0, sizeof(*lcq));
1808
1809     ccw++;
1810     ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1811     ccw->count = sizeof(*lcq);
1812     ccw->flags |= CCW_FLAG_SLI;
1813     ccw->cda = (__u32)(addr_t)lcq;
1814
1815     cqr->buildclk = get_tod_clock();
1816     cqr->status = DASD_CQR_FILLED;
1817     cqr->startdev = device;
1818     cqr->memdev = device;
1819     cqr->block = NULL;
1820     cqr->retries = 256;
1821     cqr->expires = device->default_expires * HZ;
1822     /* The command might not be supported. Suppress the error output */
1823     __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1824
1825     rc = dasd_sleep_on_interruptible(cqr);
1826     if (rc == 0) {
1827         dasd_eckd_cpy_ext_pool_data(device, lcq);
1828     } else {
1829         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1830                 "Reading the logical configuration failed with rc=%d", rc);
1831     }
1832
1833     dasd_sfree_request(cqr, cqr->memdev);
1834
1835     return rc;
1836 }
1837
1838 /*
1839  * Depending on the device type, the extent size is specified either as
1840  * cylinders per extent (CKD) or size per extent (FBA)
1841  * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1842  */
1843 static int dasd_eckd_ext_size(struct dasd_device *device)
1844 {
1845     struct dasd_eckd_private *private = device->private;
1846     struct dasd_ext_pool_sum eps = private->eps;
1847
1848     if (!eps.flags.extent_size_valid)
1849         return 0;
1850     if (eps.extent_size.size_1G)
1851         return 1113;
1852     if (eps.extent_size.size_16M)
1853         return 21;
1854
1855     return 0;
1856 }
1857
1858 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1859 {
1860     struct dasd_eckd_private *private = device->private;
1861
1862     return private->eps.warn_thrshld;
1863 }
1864
1865 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1866 {
1867     struct dasd_eckd_private *private = device->private;
1868
1869     return private->eps.flags.capacity_at_warnlevel;
1870 }
1871
1872 /*
1873  * Extent Pool out of space
1874  */
1875 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1876 {
1877     struct dasd_eckd_private *private = device->private;
1878
1879     return private->eps.flags.pool_oos;
1880 }
1881
1882 /*
1883  * Build CP for Perform Subsystem Function - SSC.
1884  */
1885 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1886                             int enable_pav)
1887 {
1888     struct dasd_ccw_req *cqr;
1889     struct dasd_psf_ssc_data *psf_ssc_data;
1890     struct ccw1 *ccw;
1891
1892     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1893                   sizeof(struct dasd_psf_ssc_data),
1894                    device, NULL);
1895
1896     if (IS_ERR(cqr)) {
1897         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1898                "Could not allocate PSF-SSC request");
1899         return cqr;
1900     }
1901     psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1902     psf_ssc_data->order = PSF_ORDER_SSC;
1903     psf_ssc_data->suborder = 0xc0;
1904     if (enable_pav) {
1905         psf_ssc_data->suborder |= 0x08;
1906         psf_ssc_data->reserved[0] = 0x88;
1907     }
1908     ccw = cqr->cpaddr;
1909     ccw->cmd_code = DASD_ECKD_CCW_PSF;
1910     ccw->cda = (__u32)(addr_t)psf_ssc_data;
1911     ccw->count = 66;
1912
1913     cqr->startdev = device;
1914     cqr->memdev = device;
1915     cqr->block = NULL;
1916     cqr->retries = 256;
1917     cqr->expires = 10*HZ;
1918     cqr->buildclk = get_tod_clock();
1919     cqr->status = DASD_CQR_FILLED;
1920     return cqr;
1921 }
1922
1923 /*
1924  * Perform Subsystem Function.
1925  * It is necessary to trigger CIO for channel revalidation since this
1926  * call might change behaviour of DASD devices.
1927  */
1928 static int
1929 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1930           unsigned long flags)
1931 {
1932     struct dasd_ccw_req *cqr;
1933     int rc;
1934
1935     cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1936     if (IS_ERR(cqr))
1937         return PTR_ERR(cqr);
1938
1939     /*
1940      * set flags e.g. turn on failfast, to prevent blocking
1941      * the calling function should handle failed requests
1942      */
1943     cqr->flags |= flags;
1944
1945     rc = dasd_sleep_on(cqr);
1946     if (!rc)
1947         /* trigger CIO to reprobe devices */
1948         css_schedule_reprobe();
1949     else if (cqr->intrc == -EAGAIN)
1950         rc = -EAGAIN;
1951
1952     dasd_sfree_request(cqr, cqr->memdev);
1953     return rc;
1954 }
1955
1956 /*
1957  * Valide storage server of current device.
1958  */
1959 static int dasd_eckd_validate_server(struct dasd_device *device,
1960                      unsigned long flags)
1961 {
1962     struct dasd_eckd_private *private = device->private;
1963     int enable_pav, rc;
1964
1965     if (private->uid.type == UA_BASE_PAV_ALIAS ||
1966         private->uid.type == UA_HYPER_PAV_ALIAS)
1967         return 0;
1968     if (dasd_nopav || MACHINE_IS_VM)
1969         enable_pav = 0;
1970     else
1971         enable_pav = 1;
1972     rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1973
1974     /* may be requested feature is not available on server,
1975      * therefore just report error and go ahead */
1976     DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1977             "returned rc=%d", private->uid.ssid, rc);
1978     return rc;
1979 }
1980
1981 /*
1982  * worker to do a validate server in case of a lost pathgroup
1983  */
1984 static void dasd_eckd_do_validate_server(struct work_struct *work)
1985 {
1986     struct dasd_device *device = container_of(work, struct dasd_device,
1987                           kick_validate);
1988     unsigned long flags = 0;
1989
1990     set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1991     if (dasd_eckd_validate_server(device, flags)
1992         == -EAGAIN) {
1993         /* schedule worker again if failed */
1994         schedule_work(&device->kick_validate);
1995         return;
1996     }
1997
1998     dasd_put_device(device);
1999 }
2000
2001 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
2002 {
2003     dasd_get_device(device);
2004     /* exit if device not online or in offline processing */
2005     if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
2006        device->state < DASD_STATE_ONLINE) {
2007         dasd_put_device(device);
2008         return;
2009     }
2010     /* queue call to do_validate_server to the kernel event daemon. */
2011     if (!schedule_work(&device->kick_validate))
2012         dasd_put_device(device);
2013 }
2014
2015 /*
2016  * Check device characteristics.
2017  * If the device is accessible using ECKD discipline, the device is enabled.
2018  */
2019 static int
2020 dasd_eckd_check_characteristics(struct dasd_device *device)
2021 {
2022     struct dasd_eckd_private *private = device->private;
2023     struct dasd_block *block;
2024     struct dasd_uid temp_uid;
2025     int rc, i;
2026     int readonly;
2027     unsigned long value;
2028
2029     /* setup work queue for validate server*/
2030     INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
2031     /* setup work queue for summary unit check */
2032     INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
2033
2034     if (!ccw_device_is_pathgroup(device->cdev)) {
2035         dev_warn(&device->cdev->dev,
2036              "A channel path group could not be established\n");
2037         return -EIO;
2038     }
2039     if (!ccw_device_is_multipath(device->cdev)) {
2040         dev_info(&device->cdev->dev,
2041              "The DASD is not operating in multipath mode\n");
2042     }
2043     if (!private) {
2044         private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
2045         if (!private) {
2046             dev_warn(&device->cdev->dev,
2047                  "Allocating memory for private DASD data "
2048                  "failed\n");
2049             return -ENOMEM;
2050         }
2051         device->private = private;
2052     } else {
2053         memset(private, 0, sizeof(*private));
2054     }
2055     /* Invalidate status of initial analysis. */
2056     private->init_cqr_status = -1;
2057     /* Set default cache operations. */
2058     private->attrib.operation = DASD_NORMAL_CACHE;
2059     private->attrib.nr_cyl = 0;
2060
2061     /* Read Configuration Data */
2062     rc = dasd_eckd_read_conf(device);
2063     if (rc)
2064         goto out_err1;
2065
2066     /* set some default values */
2067     device->default_expires = DASD_EXPIRES;
2068     device->default_retries = DASD_RETRIES;
2069     device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2070     device->path_interval = DASD_ECKD_PATH_INTERVAL;
2071
2072     if (private->conf.gneq) {
2073         value = 1;
2074         for (i = 0; i < private->conf.gneq->timeout.value; i++)
2075             value = 10 * value;
2076         value = value * private->conf.gneq->timeout.number;
2077         /* do not accept useless values */
2078         if (value != 0 && value <= DASD_EXPIRES_MAX)
2079             device->default_expires = value;
2080     }
2081
2082     dasd_eckd_get_uid(device, &temp_uid);
2083     if (temp_uid.type == UA_BASE_DEVICE) {
2084         block = dasd_alloc_block();
2085         if (IS_ERR(block)) {
2086             DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2087                     "could not allocate dasd "
2088                     "block structure");
2089             rc = PTR_ERR(block);
2090             goto out_err1;
2091         }
2092         device->block = block;
2093         block->base = device;
2094     }
2095
2096     /* register lcu with alias handling, enable PAV */
2097     rc = dasd_alias_make_device_known_to_lcu(device);
2098     if (rc)
2099         goto out_err2;
2100
2101     dasd_eckd_validate_server(device, 0);
2102
2103     /* device may report different configuration data after LCU setup */
2104     rc = dasd_eckd_read_conf(device);
2105     if (rc)
2106         goto out_err3;
2107
2108     dasd_eckd_read_fc_security(device);
2109     dasd_path_create_kobjects(device);
2110
2111     /* Read Feature Codes */
2112     dasd_eckd_read_features(device);
2113
2114     /* Read Volume Information */
2115     dasd_eckd_read_vol_info(device);
2116
2117     /* Read Extent Pool Information */
2118     dasd_eckd_read_ext_pool_info(device);
2119
2120     /* Read Device Characteristics */
2121     rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2122                      &private->rdc_data, 64);
2123     if (rc) {
2124         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2125                 "Read device characteristic failed, rc=%d", rc);
2126         goto out_err3;
2127     }
2128
2129     if ((device->features & DASD_FEATURE_USERAW) &&
2130         !(private->rdc_data.facilities.RT_in_LR)) {
2131         dev_err(&device->cdev->dev, "The storage server does not "
2132             "support raw-track access\n");
2133         rc = -EINVAL;
2134         goto out_err3;
2135     }
2136
2137     /* find the valid cylinder size */
2138     if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2139         private->rdc_data.long_no_cyl)
2140         private->real_cyl = private->rdc_data.long_no_cyl;
2141     else
2142         private->real_cyl = private->rdc_data.no_cyl;
2143
2144     private->fcx_max_data = get_fcx_max_data(device);
2145
2146     readonly = dasd_device_is_ro(device);
2147     if (readonly)
2148         set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2149
2150     dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2151          "with %d cylinders, %d heads, %d sectors%s\n",
2152          private->rdc_data.dev_type,
2153          private->rdc_data.dev_model,
2154          private->rdc_data.cu_type,
2155          private->rdc_data.cu_model.model,
2156          private->real_cyl,
2157          private->rdc_data.trk_per_cyl,
2158          private->rdc_data.sec_per_trk,
2159          readonly ? ", read-only device" : "");
2160     return 0;
2161
2162 out_err3:
2163     dasd_alias_disconnect_device_from_lcu(device);
2164 out_err2:
2165     dasd_free_block(device->block);
2166     device->block = NULL;
2167 out_err1:
2168     dasd_eckd_clear_conf_data(device);
2169     dasd_path_remove_kobjects(device);
2170     kfree(device->private);
2171     device->private = NULL;
2172     return rc;
2173 }
2174
2175 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2176 {
2177     struct dasd_eckd_private *private = device->private;
2178
2179     if (!private)
2180         return;
2181
2182     dasd_alias_disconnect_device_from_lcu(device);
2183     private->conf.ned = NULL;
2184     private->conf.sneq = NULL;
2185     private->conf.vdsneq = NULL;
2186     private->conf.gneq = NULL;
2187     dasd_eckd_clear_conf_data(device);
2188     dasd_path_remove_kobjects(device);
2189 }
2190
2191 static struct dasd_ccw_req *
2192 dasd_eckd_analysis_ccw(struct dasd_device *device)
2193 {
2194     struct dasd_eckd_private *private = device->private;
2195     struct eckd_count *count_data;
2196     struct LO_eckd_data *LO_data;
2197     struct dasd_ccw_req *cqr;
2198     struct ccw1 *ccw;
2199     int cplength, datasize;
2200     int i;
2201
2202     cplength = 8;
2203     datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2204     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2205                    NULL);
2206     if (IS_ERR(cqr))
2207         return cqr;
2208     ccw = cqr->cpaddr;
2209     /* Define extent for the first 2 tracks. */
2210     define_extent(ccw++, cqr->data, 0, 1,
2211               DASD_ECKD_CCW_READ_COUNT, device, 0);
2212     LO_data = cqr->data + sizeof(struct DE_eckd_data);
2213     /* Locate record for the first 4 records on track 0. */
2214     ccw[-1].flags |= CCW_FLAG_CC;
2215     locate_record(ccw++, LO_data++, 0, 0, 4,
2216               DASD_ECKD_CCW_READ_COUNT, device, 0);
2217
2218     count_data = private->count_area;
2219     for (i = 0; i < 4; i++) {
2220         ccw[-1].flags |= CCW_FLAG_CC;
2221         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2222         ccw->flags = 0;
2223         ccw->count = 8;
2224         ccw->cda = (__u32)(addr_t) count_data;
2225         ccw++;
2226         count_data++;
2227     }
2228
2229     /* Locate record for the first record on track 1. */
2230     ccw[-1].flags |= CCW_FLAG_CC;
2231     locate_record(ccw++, LO_data++, 1, 0, 1,
2232               DASD_ECKD_CCW_READ_COUNT, device, 0);
2233     /* Read count ccw. */
2234     ccw[-1].flags |= CCW_FLAG_CC;
2235     ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2236     ccw->flags = 0;
2237     ccw->count = 8;
2238     ccw->cda = (__u32)(addr_t) count_data;
2239
2240     cqr->block = NULL;
2241     cqr->startdev = device;
2242     cqr->memdev = device;
2243     cqr->retries = 255;
2244     cqr->buildclk = get_tod_clock();
2245     cqr->status = DASD_CQR_FILLED;
2246     /* Set flags to suppress output for expected errors */
2247     set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2248
2249     return cqr;
2250 }
2251
2252 /* differentiate between 'no record found' and any other error */
2253 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2254 {
2255     char *sense;
2256     if (init_cqr->status == DASD_CQR_DONE)
2257         return INIT_CQR_OK;
2258     else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2259          init_cqr->status == DASD_CQR_FAILED) {
2260         sense = dasd_get_sense(&init_cqr->irb);
2261         if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2262             return INIT_CQR_UNFORMATTED;
2263         else
2264             return INIT_CQR_ERROR;
2265     } else
2266         return INIT_CQR_ERROR;
2267 }
2268
2269 /*
2270  * This is the callback function for the init_analysis cqr. It saves
2271  * the status of the initial analysis ccw before it frees it and kicks
2272  * the device to continue the startup sequence. This will call
2273  * dasd_eckd_do_analysis again (if the devices has not been marked
2274  * for deletion in the meantime).
2275  */
2276 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2277                     void *data)
2278 {
2279     struct dasd_device *device = init_cqr->startdev;
2280     struct dasd_eckd_private *private = device->private;
2281
2282     private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2283     dasd_sfree_request(init_cqr, device);
2284     dasd_kick_device(device);
2285 }
2286
2287 static int dasd_eckd_start_analysis(struct dasd_block *block)
2288 {
2289     struct dasd_ccw_req *init_cqr;
2290
2291     init_cqr = dasd_eckd_analysis_ccw(block->base);
2292     if (IS_ERR(init_cqr))
2293         return PTR_ERR(init_cqr);
2294     init_cqr->callback = dasd_eckd_analysis_callback;
2295     init_cqr->callback_data = NULL;
2296     init_cqr->expires = 5*HZ;
2297     /* first try without ERP, so we can later handle unformatted
2298      * devices as special case
2299      */
2300     clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2301     init_cqr->retries = 0;
2302     dasd_add_request_head(init_cqr);
2303     return -EAGAIN;
2304 }
2305
2306 static int dasd_eckd_end_analysis(struct dasd_block *block)
2307 {
2308     struct dasd_device *device = block->base;
2309     struct dasd_eckd_private *private = device->private;
2310     struct eckd_count *count_area;
2311     unsigned int sb, blk_per_trk;
2312     int status, i;
2313     struct dasd_ccw_req *init_cqr;
2314
2315     status = private->init_cqr_status;
2316     private->init_cqr_status = -1;
2317     if (status == INIT_CQR_ERROR) {
2318         /* try again, this time with full ERP */
2319         init_cqr = dasd_eckd_analysis_ccw(device);
2320         dasd_sleep_on(init_cqr);
2321         status = dasd_eckd_analysis_evaluation(init_cqr);
2322         dasd_sfree_request(init_cqr, device);
2323     }
2324
2325     if (device->features & DASD_FEATURE_USERAW) {
2326         block->bp_block = DASD_RAW_BLOCKSIZE;
2327         blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2328         block->s2b_shift = 3;
2329         goto raw;
2330     }
2331
2332     if (status == INIT_CQR_UNFORMATTED) {
2333         dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2334         return -EMEDIUMTYPE;
2335     } else if (status == INIT_CQR_ERROR) {
2336         dev_err(&device->cdev->dev,
2337             "Detecting the DASD disk layout failed because "
2338             "of an I/O error\n");
2339         return -EIO;
2340     }
2341
2342     private->uses_cdl = 1;
2343     /* Check Track 0 for Compatible Disk Layout */
2344     count_area = NULL;
2345     for (i = 0; i < 3; i++) {
2346         if (private->count_area[i].kl != 4 ||
2347             private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2348             private->count_area[i].cyl != 0 ||
2349             private->count_area[i].head != count_area_head[i] ||
2350             private->count_area[i].record != count_area_rec[i]) {
2351             private->uses_cdl = 0;
2352             break;
2353         }
2354     }
2355     if (i == 3)
2356         count_area = &private->count_area[3];
2357
2358     if (private->uses_cdl == 0) {
2359         for (i = 0; i < 5; i++) {
2360             if ((private->count_area[i].kl != 0) ||
2361                 (private->count_area[i].dl !=
2362                  private->count_area[0].dl) ||
2363                 private->count_area[i].cyl !=  0 ||
2364                 private->count_area[i].head != count_area_head[i] ||
2365                 private->count_area[i].record != count_area_rec[i])
2366                 break;
2367         }
2368         if (i == 5)
2369             count_area = &private->count_area[0];
2370     } else {
2371         if (private->count_area[3].record == 1)
2372             dev_warn(&device->cdev->dev,
2373                  "Track 0 has no records following the VTOC\n");
2374     }
2375
2376     if (count_area != NULL && count_area->kl == 0) {
2377         /* we found notthing violating our disk layout */
2378         if (dasd_check_blocksize(count_area->dl) == 0)
2379             block->bp_block = count_area->dl;
2380     }
2381     if (block->bp_block == 0) {
2382         dev_warn(&device->cdev->dev,
2383              "The disk layout of the DASD is not supported\n");
2384         return -EMEDIUMTYPE;
2385     }
2386     block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2387     for (sb = 512; sb < block->bp_block; sb = sb << 1)
2388         block->s2b_shift++;
2389
2390     blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2391
2392 raw:
2393     block->blocks = ((unsigned long) private->real_cyl *
2394               private->rdc_data.trk_per_cyl *
2395               blk_per_trk);
2396
2397     dev_info(&device->cdev->dev,
2398          "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2399          "%s\n", (block->bp_block >> 10),
2400          (((unsigned long) private->real_cyl *
2401            private->rdc_data.trk_per_cyl *
2402            blk_per_trk * (block->bp_block >> 9)) >> 1),
2403          ((blk_per_trk * block->bp_block) >> 10),
2404          private->uses_cdl ?
2405          "compatible disk layout" : "linux disk layout");
2406
2407     return 0;
2408 }
2409
2410 static int dasd_eckd_do_analysis(struct dasd_block *block)
2411 {
2412     struct dasd_eckd_private *private = block->base->private;
2413
2414     if (private->init_cqr_status < 0)
2415         return dasd_eckd_start_analysis(block);
2416     else
2417         return dasd_eckd_end_analysis(block);
2418 }
2419
2420 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2421 {
2422     return dasd_alias_add_device(device);
2423 };
2424
2425 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2426 {
2427     if (cancel_work_sync(&device->reload_device))
2428         dasd_put_device(device);
2429     if (cancel_work_sync(&device->kick_validate))
2430         dasd_put_device(device);
2431
2432     return 0;
2433 };
2434
2435 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2436 {
2437     return dasd_alias_remove_device(device);
2438 };
2439
2440 static int
2441 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2442 {
2443     struct dasd_eckd_private *private = block->base->private;
2444
2445     if (dasd_check_blocksize(block->bp_block) == 0) {
2446         geo->sectors = recs_per_track(&private->rdc_data,
2447                           0, block->bp_block);
2448     }
2449     geo->cylinders = private->rdc_data.no_cyl;
2450     geo->heads = private->rdc_data.trk_per_cyl;
2451     return 0;
2452 }
2453
2454 /*
2455  * Build the TCW request for the format check
2456  */
2457 static struct dasd_ccw_req *
2458 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2459               int enable_pav, struct eckd_count *fmt_buffer,
2460               int rpt)
2461 {
2462     struct dasd_eckd_private *start_priv;
2463     struct dasd_device *startdev = NULL;
2464     struct tidaw *last_tidaw = NULL;
2465     struct dasd_ccw_req *cqr;
2466     struct itcw *itcw;
2467     int itcw_size;
2468     int count;
2469     int rc;
2470     int i;
2471
2472     if (enable_pav)
2473         startdev = dasd_alias_get_start_dev(base);
2474
2475     if (!startdev)
2476         startdev = base;
2477
2478     start_priv = startdev->private;
2479
2480     count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2481
2482     /*
2483      * we're adding 'count' amount of tidaw to the itcw.
2484      * calculate the corresponding itcw_size
2485      */
2486     itcw_size = itcw_calc_size(0, count, 0);
2487
2488     cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2489     if (IS_ERR(cqr))
2490         return cqr;
2491
2492     start_priv->count++;
2493
2494     itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2495     if (IS_ERR(itcw)) {
2496         rc = -EINVAL;
2497         goto out_err;
2498     }
2499
2500     cqr->cpaddr = itcw_get_tcw(itcw);
2501     rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2502               DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2503               sizeof(struct eckd_count),
2504               count * sizeof(struct eckd_count), 0, rpt);
2505     if (rc)
2506         goto out_err;
2507
2508     for (i = 0; i < count; i++) {
2509         last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2510                         sizeof(struct eckd_count));
2511         if (IS_ERR(last_tidaw)) {
2512             rc = -EINVAL;
2513             goto out_err;
2514         }
2515     }
2516
2517     last_tidaw->flags |= TIDAW_FLAGS_LAST;
2518     itcw_finalize(itcw);
2519
2520     cqr->cpmode = 1;
2521     cqr->startdev = startdev;
2522     cqr->memdev = startdev;
2523     cqr->basedev = base;
2524     cqr->retries = startdev->default_retries;
2525     cqr->expires = startdev->default_expires * HZ;
2526     cqr->buildclk = get_tod_clock();
2527     cqr->status = DASD_CQR_FILLED;
2528     /* Set flags to suppress output for expected errors */
2529     set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2530     set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2531
2532     return cqr;
2533
2534 out_err:
2535     dasd_sfree_request(cqr, startdev);
2536
2537     return ERR_PTR(rc);
2538 }
2539
2540 /*
2541  * Build the CCW request for the format check
2542  */
2543 static struct dasd_ccw_req *
2544 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2545               int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2546 {
2547     struct dasd_eckd_private *start_priv;
2548     struct dasd_eckd_private *base_priv;
2549     struct dasd_device *startdev = NULL;
2550     struct dasd_ccw_req *cqr;
2551     struct ccw1 *ccw;
2552     void *data;
2553     int cplength, datasize;
2554     int use_prefix;
2555     int count;
2556     int i;
2557
2558     if (enable_pav)
2559         startdev = dasd_alias_get_start_dev(base);
2560
2561     if (!startdev)
2562         startdev = base;
2563
2564     start_priv = startdev->private;
2565     base_priv = base->private;
2566
2567     count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2568
2569     use_prefix = base_priv->features.feature[8] & 0x01;
2570
2571     if (use_prefix) {
2572         cplength = 1;
2573         datasize = sizeof(struct PFX_eckd_data);
2574     } else {
2575         cplength = 2;
2576         datasize = sizeof(struct DE_eckd_data) +
2577             sizeof(struct LO_eckd_data);
2578     }
2579     cplength += count;
2580
2581     cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2582     if (IS_ERR(cqr))
2583         return cqr;
2584
2585     start_priv->count++;
2586     data = cqr->data;
2587     ccw = cqr->cpaddr;
2588
2589     if (use_prefix) {
2590         prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2591                DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2592                count, 0, 0);
2593     } else {
2594         define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2595                   DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2596
2597         data += sizeof(struct DE_eckd_data);
2598         ccw[-1].flags |= CCW_FLAG_CC;
2599
2600         locate_record(ccw++, data, fdata->start_unit, 0, count,
2601                   DASD_ECKD_CCW_READ_COUNT, base, 0);
2602     }
2603
2604     for (i = 0; i < count; i++) {
2605         ccw[-1].flags |= CCW_FLAG_CC;
2606         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2607         ccw->flags = CCW_FLAG_SLI;
2608         ccw->count = 8;
2609         ccw->cda = (__u32)(addr_t) fmt_buffer;
2610         ccw++;
2611         fmt_buffer++;
2612     }
2613
2614     cqr->startdev = startdev;
2615     cqr->memdev = startdev;
2616     cqr->basedev = base;
2617     cqr->retries = DASD_RETRIES;
2618     cqr->expires = startdev->default_expires * HZ;
2619     cqr->buildclk = get_tod_clock();
2620     cqr->status = DASD_CQR_FILLED;
2621     /* Set flags to suppress output for expected errors */
2622     set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2623
2624     return cqr;
2625 }
2626
2627 static struct dasd_ccw_req *
2628 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2629                struct format_data_t *fdata, int enable_pav)
2630 {
2631     struct dasd_eckd_private *base_priv;
2632     struct dasd_eckd_private *start_priv;
2633     struct dasd_ccw_req *fcp;
2634     struct eckd_count *ect;
2635     struct ch_t address;
2636     struct ccw1 *ccw;
2637     void *data;
2638     int rpt;
2639     int cplength, datasize;
2640     int i, j;
2641     int intensity = 0;
2642     int r0_perm;
2643     int nr_tracks;
2644     int use_prefix;
2645
2646     if (enable_pav)
2647         startdev = dasd_alias_get_start_dev(base);
2648
2649     if (!startdev)
2650         startdev = base;
2651
2652     start_priv = startdev->private;
2653     base_priv = base->private;
2654
2655     rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2656
2657     nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2658
2659     /*
2660      * fdata->intensity is a bit string that tells us what to do:
2661      *   Bit 0: write record zero
2662      *   Bit 1: write home address, currently not supported
2663      *   Bit 2: invalidate tracks
2664      *   Bit 3: use OS/390 compatible disk layout (cdl)
2665      *   Bit 4: do not allow storage subsystem to modify record zero
2666      * Only some bit combinations do make sense.
2667      */
2668     if (fdata->intensity & 0x10) {
2669         r0_perm = 0;
2670         intensity = fdata->intensity & ~0x10;
2671     } else {
2672         r0_perm = 1;
2673         intensity = fdata->intensity;
2674     }
2675
2676     use_prefix = base_priv->features.feature[8] & 0x01;
2677
2678     switch (intensity) {
2679     case 0x00:  /* Normal format */
2680     case 0x08:  /* Normal format, use cdl. */
2681         cplength = 2 + (rpt*nr_tracks);
2682         if (use_prefix)
2683             datasize = sizeof(struct PFX_eckd_data) +
2684                 sizeof(struct LO_eckd_data) +
2685                 rpt * nr_tracks * sizeof(struct eckd_count);
2686         else
2687             datasize = sizeof(struct DE_eckd_data) +
2688                 sizeof(struct LO_eckd_data) +
2689                 rpt * nr_tracks * sizeof(struct eckd_count);
2690         break;
2691     case 0x01:  /* Write record zero and format track. */
2692     case 0x09:  /* Write record zero and format track, use cdl. */
2693         cplength = 2 + rpt * nr_tracks;
2694         if (use_prefix)
2695             datasize = sizeof(struct PFX_eckd_data) +
2696                 sizeof(struct LO_eckd_data) +
2697                 sizeof(struct eckd_count) +
2698                 rpt * nr_tracks * sizeof(struct eckd_count);
2699         else
2700             datasize = sizeof(struct DE_eckd_data) +
2701                 sizeof(struct LO_eckd_data) +
2702                 sizeof(struct eckd_count) +
2703                 rpt * nr_tracks * sizeof(struct eckd_count);
2704         break;
2705     case 0x04:  /* Invalidate track. */
2706     case 0x0c:  /* Invalidate track, use cdl. */
2707         cplength = 3;
2708         if (use_prefix)
2709             datasize = sizeof(struct PFX_eckd_data) +
2710                 sizeof(struct LO_eckd_data) +
2711                 sizeof(struct eckd_count);
2712         else
2713             datasize = sizeof(struct DE_eckd_data) +
2714                 sizeof(struct LO_eckd_data) +
2715                 sizeof(struct eckd_count);
2716         break;
2717     default:
2718         dev_warn(&startdev->cdev->dev,
2719              "An I/O control call used incorrect flags 0x%x\n",
2720              fdata->intensity);
2721         return ERR_PTR(-EINVAL);
2722     }
2723
2724     fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2725     if (IS_ERR(fcp))
2726         return fcp;
2727
2728     start_priv->count++;
2729     data = fcp->data;
2730     ccw = fcp->cpaddr;
2731
2732     switch (intensity & ~0x08) {
2733     case 0x00: /* Normal format. */
2734         if (use_prefix) {
2735             prefix(ccw++, (struct PFX_eckd_data *) data,
2736                    fdata->start_unit, fdata->stop_unit,
2737                    DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2738             /* grant subsystem permission to format R0 */
2739             if (r0_perm)
2740                 ((struct PFX_eckd_data *)data)
2741                     ->define_extent.ga_extended |= 0x04;
2742             data += sizeof(struct PFX_eckd_data);
2743         } else {
2744             define_extent(ccw++, (struct DE_eckd_data *) data,
2745                       fdata->start_unit, fdata->stop_unit,
2746                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2747             /* grant subsystem permission to format R0 */
2748             if (r0_perm)
2749                 ((struct DE_eckd_data *) data)
2750                     ->ga_extended |= 0x04;
2751             data += sizeof(struct DE_eckd_data);
2752         }
2753         ccw[-1].flags |= CCW_FLAG_CC;
2754         locate_record(ccw++, (struct LO_eckd_data *) data,
2755                   fdata->start_unit, 0, rpt*nr_tracks,
2756                   DASD_ECKD_CCW_WRITE_CKD, base,
2757                   fdata->blksize);
2758         data += sizeof(struct LO_eckd_data);
2759         break;
2760     case 0x01: /* Write record zero + format track. */
2761         if (use_prefix) {
2762             prefix(ccw++, (struct PFX_eckd_data *) data,
2763                    fdata->start_unit, fdata->stop_unit,
2764                    DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2765                    base, startdev);
2766             data += sizeof(struct PFX_eckd_data);
2767         } else {
2768             define_extent(ccw++, (struct DE_eckd_data *) data,
2769                    fdata->start_unit, fdata->stop_unit,
2770                    DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2771             data += sizeof(struct DE_eckd_data);
2772         }
2773         ccw[-1].flags |= CCW_FLAG_CC;
2774         locate_record(ccw++, (struct LO_eckd_data *) data,
2775                   fdata->start_unit, 0, rpt * nr_tracks + 1,
2776                   DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2777                   base->block->bp_block);
2778         data += sizeof(struct LO_eckd_data);
2779         break;
2780     case 0x04: /* Invalidate track. */
2781         if (use_prefix) {
2782             prefix(ccw++, (struct PFX_eckd_data *) data,
2783                    fdata->start_unit, fdata->stop_unit,
2784                    DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2785             data += sizeof(struct PFX_eckd_data);
2786         } else {
2787             define_extent(ccw++, (struct DE_eckd_data *) data,
2788                    fdata->start_unit, fdata->stop_unit,
2789                    DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2790             data += sizeof(struct DE_eckd_data);
2791         }
2792         ccw[-1].flags |= CCW_FLAG_CC;
2793         locate_record(ccw++, (struct LO_eckd_data *) data,
2794                   fdata->start_unit, 0, 1,
2795                   DASD_ECKD_CCW_WRITE_CKD, base, 8);
2796         data += sizeof(struct LO_eckd_data);
2797         break;
2798     }
2799
2800     for (j = 0; j < nr_tracks; j++) {
2801         /* calculate cylinder and head for the current track */
2802         set_ch_t(&address,
2803              (fdata->start_unit + j) /
2804              base_priv->rdc_data.trk_per_cyl,
2805              (fdata->start_unit + j) %
2806              base_priv->rdc_data.trk_per_cyl);
2807         if (intensity & 0x01) { /* write record zero */
2808             ect = (struct eckd_count *) data;
2809             data += sizeof(struct eckd_count);
2810             ect->cyl = address.cyl;
2811             ect->head = address.head;
2812             ect->record = 0;
2813             ect->kl = 0;
2814             ect->dl = 8;
2815             ccw[-1].flags |= CCW_FLAG_CC;
2816             ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2817             ccw->flags = CCW_FLAG_SLI;
2818             ccw->count = 8;
2819             ccw->cda = (__u32)(addr_t) ect;
2820             ccw++;
2821         }
2822         if ((intensity & ~0x08) & 0x04) {   /* erase track */
2823             ect = (struct eckd_count *) data;
2824             data += sizeof(struct eckd_count);
2825             ect->cyl = address.cyl;
2826             ect->head = address.head;
2827             ect->record = 1;
2828             ect->kl = 0;
2829             ect->dl = 0;
2830             ccw[-1].flags |= CCW_FLAG_CC;
2831             ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2832             ccw->flags = CCW_FLAG_SLI;
2833             ccw->count = 8;
2834             ccw->cda = (__u32)(addr_t) ect;
2835         } else {        /* write remaining records */
2836             for (i = 0; i < rpt; i++) {
2837                 ect = (struct eckd_count *) data;
2838                 data += sizeof(struct eckd_count);
2839                 ect->cyl = address.cyl;
2840                 ect->head = address.head;
2841                 ect->record = i + 1;
2842                 ect->kl = 0;
2843                 ect->dl = fdata->blksize;
2844                 /*
2845                  * Check for special tracks 0-1
2846                  * when formatting CDL
2847                  */
2848                 if ((intensity & 0x08) &&
2849                     address.cyl == 0 && address.head == 0) {
2850                     if (i < 3) {
2851                         ect->kl = 4;
2852                         ect->dl = sizes_trk0[i] - 4;
2853                     }
2854                 }
2855                 if ((intensity & 0x08) &&
2856                     address.cyl == 0 && address.head == 1) {
2857                     ect->kl = 44;
2858                     ect->dl = LABEL_SIZE - 44;
2859                 }
2860                 ccw[-1].flags |= CCW_FLAG_CC;
2861                 if (i != 0 || j == 0)
2862                     ccw->cmd_code =
2863                         DASD_ECKD_CCW_WRITE_CKD;
2864                 else
2865                     ccw->cmd_code =
2866                         DASD_ECKD_CCW_WRITE_CKD_MT;
2867                 ccw->flags = CCW_FLAG_SLI;
2868                 ccw->count = 8;
2869                 ccw->cda = (__u32)(addr_t) ect;
2870                 ccw++;
2871             }
2872         }
2873     }
2874
2875     fcp->startdev = startdev;
2876     fcp->memdev = startdev;
2877     fcp->basedev = base;
2878     fcp->retries = 256;
2879     fcp->expires = startdev->default_expires * HZ;
2880     fcp->buildclk = get_tod_clock();
2881     fcp->status = DASD_CQR_FILLED;
2882
2883     return fcp;
2884 }
2885
2886 /*
2887  * Wrapper function to build a CCW request depending on input data
2888  */
2889 static struct dasd_ccw_req *
2890 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2891                    struct format_data_t *fdata, int enable_pav,
2892                    int tpm, struct eckd_count *fmt_buffer, int rpt)
2893 {
2894     struct dasd_ccw_req *ccw_req;
2895
2896     if (!fmt_buffer) {
2897         ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2898     } else {
2899         if (tpm)
2900             ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2901                                 enable_pav,
2902                                 fmt_buffer, rpt);
2903         else
2904             ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2905                             fmt_buffer, rpt);
2906     }
2907
2908     return ccw_req;
2909 }
2910
2911 /*
2912  * Sanity checks on format_data
2913  */
2914 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2915                       struct format_data_t *fdata)
2916 {
2917     struct dasd_eckd_private *private = base->private;
2918
2919     if (fdata->start_unit >=
2920         (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2921         dev_warn(&base->cdev->dev,
2922              "Start track number %u used in formatting is too big\n",
2923              fdata->start_unit);
2924         return -EINVAL;
2925     }
2926     if (fdata->stop_unit >=
2927         (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2928         dev_warn(&base->cdev->dev,
2929              "Stop track number %u used in formatting is too big\n",
2930              fdata->stop_unit);
2931         return -EINVAL;
2932     }
2933     if (fdata->start_unit > fdata->stop_unit) {
2934         dev_warn(&base->cdev->dev,
2935              "Start track %u used in formatting exceeds end track\n",
2936              fdata->start_unit);
2937         return -EINVAL;
2938     }
2939     if (dasd_check_blocksize(fdata->blksize) != 0) {
2940         dev_warn(&base->cdev->dev,
2941              "The DASD cannot be formatted with block size %u\n",
2942              fdata->blksize);
2943         return -EINVAL;
2944     }
2945     return 0;
2946 }
2947
2948 /*
2949  * This function will process format_data originally coming from an IOCTL
2950  */
2951 static int dasd_eckd_format_process_data(struct dasd_device *base,
2952                      struct format_data_t *fdata,
2953                      int enable_pav, int tpm,
2954                      struct eckd_count *fmt_buffer, int rpt,
2955                      struct irb *irb)
2956 {
2957     struct dasd_eckd_private *private = base->private;
2958     struct dasd_ccw_req *cqr, *n;
2959     struct list_head format_queue;
2960     struct dasd_device *device;
2961     char *sense = NULL;
2962     int old_start, old_stop, format_step;
2963     int step, retry;
2964     int rc;
2965
2966     rc = dasd_eckd_format_sanity_checks(base, fdata);
2967     if (rc)
2968         return rc;
2969
2970     INIT_LIST_HEAD(&format_queue);
2971
2972     old_start = fdata->start_unit;
2973     old_stop = fdata->stop_unit;
2974
2975     if (!tpm && fmt_buffer != NULL) {
2976         /* Command Mode / Format Check */
2977         format_step = 1;
2978     } else if (tpm && fmt_buffer != NULL) {
2979         /* Transport Mode / Format Check */
2980         format_step = DASD_CQR_MAX_CCW / rpt;
2981     } else {
2982         /* Normal Formatting */
2983         format_step = DASD_CQR_MAX_CCW /
2984             recs_per_track(&private->rdc_data, 0, fdata->blksize);
2985     }
2986
2987     do {
2988         retry = 0;
2989         while (fdata->start_unit <= old_stop) {
2990             step = fdata->stop_unit - fdata->start_unit + 1;
2991             if (step > format_step) {
2992                 fdata->stop_unit =
2993                     fdata->start_unit + format_step - 1;
2994             }
2995
2996             cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2997                                  enable_pav, tpm,
2998                                  fmt_buffer, rpt);
2999             if (IS_ERR(cqr)) {
3000                 rc = PTR_ERR(cqr);
3001                 if (rc == -ENOMEM) {
3002                     if (list_empty(&format_queue))
3003                         goto out;
3004                     /*
3005                      * not enough memory available, start
3006                      * requests retry after first requests
3007                      * were finished
3008                      */
3009                     retry = 1;
3010                     break;
3011                 }
3012                 goto out_err;
3013             }
3014             list_add_tail(&cqr->blocklist, &format_queue);
3015
3016             if (fmt_buffer) {
3017                 step = fdata->stop_unit - fdata->start_unit + 1;
3018                 fmt_buffer += rpt * step;
3019             }
3020             fdata->start_unit = fdata->stop_unit + 1;
3021             fdata->stop_unit = old_stop;
3022         }
3023
3024         rc = dasd_sleep_on_queue(&format_queue);
3025
3026 out_err:
3027         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
3028             device = cqr->startdev;
3029             private = device->private;
3030
3031             if (cqr->status == DASD_CQR_FAILED) {
3032                 /*
3033                  * Only get sense data if called by format
3034                  * check
3035                  */
3036                 if (fmt_buffer && irb) {
3037                     sense = dasd_get_sense(&cqr->irb);
3038                     memcpy(irb, &cqr->irb, sizeof(*irb));
3039                 }
3040                 rc = -EIO;
3041             }
3042             list_del_init(&cqr->blocklist);
3043             dasd_ffree_request(cqr, device);
3044             private->count--;
3045         }
3046
3047         if (rc && rc != -EIO)
3048             goto out;
3049         if (rc == -EIO) {
3050             /*
3051              * In case fewer than the expected records are on the
3052              * track, we will most likely get a 'No Record Found'
3053              * error (in command mode) or a 'File Protected' error
3054              * (in transport mode). Those particular cases shouldn't
3055              * pass the -EIO to the IOCTL, therefore reset the rc
3056              * and continue.
3057              */
3058             if (sense &&
3059                 (sense[1] & SNS1_NO_REC_FOUND ||
3060                  sense[1] & SNS1_FILE_PROTECTED))
3061                 retry = 1;
3062             else
3063                 goto out;
3064         }
3065
3066     } while (retry);
3067
3068 out:
3069     fdata->start_unit = old_start;
3070     fdata->stop_unit = old_stop;
3071
3072     return rc;
3073 }
3074
3075 static int dasd_eckd_format_device(struct dasd_device *base,
3076                    struct format_data_t *fdata, int enable_pav)
3077 {
3078     return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3079                          0, NULL);
3080 }
3081
3082 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3083                       struct dasd_ccw_req *cqr)
3084 {
3085     struct dasd_block *block = cqr->block;
3086     struct dasd_format_entry *format;
3087     unsigned long flags;
3088     bool rc = false;
3089
3090     spin_lock_irqsave(&block->format_lock, flags);
3091     if (cqr->trkcount != atomic_read(&block->trkcount)) {
3092         /*
3093          * The number of formatted tracks has changed after request
3094          * start and we can not tell if the current track was involved.
3095          * To avoid data corruption treat it as if the current track is
3096          * involved
3097          */
3098         rc = true;
3099         goto out;
3100     }
3101     list_for_each_entry(format, &block->format_list, list) {
3102         if (format->track == to_format->track) {
3103             rc = true;
3104             goto out;
3105         }
3106     }
3107     list_add_tail(&to_format->list, &block->format_list);
3108
3109 out:
3110     spin_unlock_irqrestore(&block->format_lock, flags);
3111     return rc;
3112 }
3113
3114 static void clear_format_track(struct dasd_format_entry *format,
3115                   struct dasd_block *block)
3116 {
3117     unsigned long flags;
3118
3119     spin_lock_irqsave(&block->format_lock, flags);
3120     atomic_inc(&block->trkcount);
3121     list_del_init(&format->list);
3122     spin_unlock_irqrestore(&block->format_lock, flags);
3123 }
3124
3125 /*
3126  * Callback function to free ESE format requests.
3127  */
3128 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3129 {
3130     struct dasd_device *device = cqr->startdev;
3131     struct dasd_eckd_private *private = device->private;
3132     struct dasd_format_entry *format = data;
3133
3134     clear_format_track(format, cqr->basedev->block);
3135     private->count--;
3136     dasd_ffree_request(cqr, device);
3137 }
3138
3139 static struct dasd_ccw_req *
3140 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3141              struct irb *irb)
3142 {
3143     struct dasd_eckd_private *private;
3144     struct dasd_format_entry *format;
3145     struct format_data_t fdata;
3146     unsigned int recs_per_trk;
3147     struct dasd_ccw_req *fcqr;
3148     struct dasd_device *base;
3149     struct dasd_block *block;
3150     unsigned int blksize;
3151     struct request *req;
3152     sector_t first_trk;
3153     sector_t last_trk;
3154     sector_t curr_trk;
3155     int rc;
3156
3157     req = dasd_get_callback_data(cqr);
3158     block = cqr->block;
3159     base = block->base;
3160     private = base->private;
3161     blksize = block->bp_block;
3162     recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3163     format = &startdev->format_entry;
3164
3165     first_trk = blk_rq_pos(req) >> block->s2b_shift;
3166     sector_div(first_trk, recs_per_trk);
3167     last_trk =
3168         (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3169     sector_div(last_trk, recs_per_trk);
3170     rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3171     if (rc)
3172         return ERR_PTR(rc);
3173
3174     if (curr_trk < first_trk || curr_trk > last_trk) {
3175         DBF_DEV_EVENT(DBF_WARNING, startdev,
3176                   "ESE error track %llu not within range %llu - %llu\n",
3177                   curr_trk, first_trk, last_trk);
3178         return ERR_PTR(-EINVAL);
3179     }
3180     format->track = curr_trk;
3181     /* test if track is already in formatting by another thread */
3182     if (test_and_set_format_track(format, cqr)) {
3183         /* this is no real error so do not count down retries */
3184         cqr->retries++;
3185         return ERR_PTR(-EEXIST);
3186     }
3187
3188     fdata.start_unit = curr_trk;
3189     fdata.stop_unit = curr_trk;
3190     fdata.blksize = blksize;
3191     fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3192
3193     rc = dasd_eckd_format_sanity_checks(base, &fdata);
3194     if (rc)
3195         return ERR_PTR(-EINVAL);
3196
3197     /*
3198      * We're building the request with PAV disabled as we're reusing
3199      * the former startdev.
3200      */
3201     fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3202     if (IS_ERR(fcqr))
3203         return fcqr;
3204
3205     fcqr->callback = dasd_eckd_ese_format_cb;
3206     fcqr->callback_data = (void *) format;
3207
3208     return fcqr;
3209 }
3210
3211 /*
3212  * When data is read from an unformatted area of an ESE volume, this function
3213  * returns zeroed data and thereby mimics a read of zero data.
3214  *
3215  * The first unformatted track is the one that got the NRF error, the address is
3216  * encoded in the sense data.
3217  *
3218  * All tracks before have returned valid data and should not be touched.
3219  * All tracks after the unformatted track might be formatted or not. This is
3220  * currently not known, remember the processed data and return the remainder of
3221  * the request to the blocklayer in __dasd_cleanup_cqr().
3222  */
3223 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3224 {
3225     struct dasd_eckd_private *private;
3226     sector_t first_trk, last_trk;
3227     sector_t first_blk, last_blk;
3228     unsigned int blksize, off;
3229     unsigned int recs_per_trk;
3230     struct dasd_device *base;
3231     struct req_iterator iter;
3232     struct dasd_block *block;
3233     unsigned int skip_block;
3234     unsigned int blk_count;
3235     struct request *req;
3236     struct bio_vec bv;
3237     sector_t curr_trk;
3238     sector_t end_blk;
3239     char *dst;
3240     int rc;
3241
3242     req = (struct request *) cqr->callback_data;
3243     base = cqr->block->base;
3244     blksize = base->block->bp_block;
3245     block =  cqr->block;
3246     private = base->private;
3247     skip_block = 0;
3248     blk_count = 0;
3249
3250     recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3251     first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3252     sector_div(first_trk, recs_per_trk);
3253     last_trk = last_blk =
3254         (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3255     sector_div(last_trk, recs_per_trk);
3256     rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3257     if (rc)
3258         return rc;
3259
3260     /* sanity check if the current track from sense data is valid */
3261     if (curr_trk < first_trk || curr_trk > last_trk) {
3262         DBF_DEV_EVENT(DBF_WARNING, base,
3263                   "ESE error track %llu not within range %llu - %llu\n",
3264                   curr_trk, first_trk, last_trk);
3265         return -EINVAL;
3266     }
3267
3268     /*
3269      * if not the first track got the NRF error we have to skip over valid
3270      * blocks
3271      */
3272     if (curr_trk != first_trk)
3273         skip_block = curr_trk * recs_per_trk - first_blk;
3274
3275     /* we have no information beyond the current track */
3276     end_blk = (curr_trk + 1) * recs_per_trk;
3277
3278     rq_for_each_segment(bv, req, iter) {
3279         dst = bvec_virt(&bv);
3280         for (off = 0; off < bv.bv_len; off += blksize) {
3281             if (first_blk + blk_count >= end_blk) {
3282                 cqr->proc_bytes = blk_count * blksize;
3283                 return 0;
3284             }
3285             if (dst && !skip_block)
3286                 memset(dst, 0, blksize);
3287             else
3288                 skip_block--;
3289             dst += blksize;
3290             blk_count++;
3291         }
3292     }
3293     return 0;
3294 }
3295
3296 /*
3297  * Helper function to count consecutive records of a single track.
3298  */
3299 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3300                    int max)
3301 {
3302     int head;
3303     int i;
3304
3305     head = fmt_buffer[start].head;
3306
3307     /*
3308      * There are 3 conditions where we stop counting:
3309      * - if data reoccurs (same head and record may reoccur), which may
3310      *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
3311      * - when the head changes, because we're iterating over several tracks
3312      *   then (DASD_ECKD_CCW_READ_COUNT_MT)
3313      * - when we've reached the end of sensible data in the buffer (the
3314      *   record will be 0 then)
3315      */
3316     for (i = start; i < max; i++) {
3317         if (i > start) {
3318             if ((fmt_buffer[i].head == head &&
3319                 fmt_buffer[i].record == 1) ||
3320                 fmt_buffer[i].head != head ||
3321                 fmt_buffer[i].record == 0)
3322                 break;
3323         }
3324     }
3325
3326     return i - start;
3327 }
3328
3329 /*
3330  * Evaluate a given range of tracks. Data like number of records, blocksize,
3331  * record ids, and key length are compared with expected data.
3332  *
3333  * If a mismatch occurs, the corresponding error bit is set, as well as
3334  * additional information, depending on the error.
3335  */
3336 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3337                          struct format_check_t *cdata,
3338                          int rpt_max, int rpt_exp,
3339                          int trk_per_cyl, int tpm)
3340 {
3341     struct ch_t geo;
3342     int max_entries;
3343     int count = 0;
3344     int trkcount;
3345     int blksize;
3346     int pos = 0;
3347     int i, j;
3348     int kl;
3349
3350     trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3351     max_entries = trkcount * rpt_max;
3352
3353     for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3354         /* Calculate the correct next starting position in the buffer */
3355         if (tpm) {
3356             while (fmt_buffer[pos].record == 0 &&
3357                    fmt_buffer[pos].dl == 0) {
3358                 if (pos++ > max_entries)
3359                     break;
3360             }
3361         } else {
3362             if (i != cdata->expect.start_unit)
3363                 pos += rpt_max - count;
3364         }
3365
3366         /* Calculate the expected geo values for the current track */
3367         set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3368
3369         /* Count and check number of records */
3370         count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3371
3372         if (count < rpt_exp) {
3373             cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3374             break;
3375         }
3376         if (count > rpt_exp) {
3377             cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3378             break;
3379         }
3380
3381         for (j = 0; j < count; j++, pos++) {
3382             blksize = cdata->expect.blksize;
3383             kl = 0;
3384
3385             /*
3386              * Set special values when checking CDL formatted
3387              * devices.
3388              */
3389             if ((cdata->expect.intensity & 0x08) &&
3390                 geo.cyl == 0 && geo.head == 0) {
3391                 if (j < 3) {
3392                     blksize = sizes_trk0[j] - 4;
3393                     kl = 4;
3394                 }
3395             }
3396             if ((cdata->expect.intensity & 0x08) &&
3397                 geo.cyl == 0 && geo.head == 1) {
3398                 blksize = LABEL_SIZE - 44;
3399                 kl = 44;
3400             }
3401
3402             /* Check blocksize */
3403             if (fmt_buffer[pos].dl != blksize) {
3404                 cdata->result = DASD_FMT_ERR_BLKSIZE;
3405                 goto out;
3406             }
3407             /* Check if key length is 0 */
3408             if (fmt_buffer[pos].kl != kl) {
3409                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3410                 goto out;
3411             }
3412             /* Check if record_id is correct */
3413             if (fmt_buffer[pos].cyl != geo.cyl ||
3414                 fmt_buffer[pos].head != geo.head ||
3415                 fmt_buffer[pos].record != (j + 1)) {
3416                 cdata->result = DASD_FMT_ERR_RECORD_ID;
3417                 goto out;
3418             }
3419         }
3420     }
3421
3422 out:
3423     /*
3424      * In case of no errors, we need to decrease by one
3425      * to get the correct positions.
3426      */
3427     if (!cdata->result) {
3428         i--;
3429         pos--;
3430     }
3431
3432     cdata->unit = i;
3433     cdata->num_records = count;
3434     cdata->rec = fmt_buffer[pos].record;
3435     cdata->blksize = fmt_buffer[pos].dl;
3436     cdata->key_length = fmt_buffer[pos].kl;
3437 }
3438
3439 /*
3440  * Check the format of a range of tracks of a DASD.
3441  */
3442 static int dasd_eckd_check_device_format(struct dasd_device *base,
3443                      struct format_check_t *cdata,
3444                      int enable_pav)
3445 {
3446     struct dasd_eckd_private *private = base->private;
3447     struct eckd_count *fmt_buffer;
3448     struct irb irb;
3449     int rpt_max, rpt_exp;
3450     int fmt_buffer_size;
3451     int trk_per_cyl;
3452     int trkcount;
3453     int tpm = 0;
3454     int rc;
3455
3456     trk_per_cyl = private->rdc_data.trk_per_cyl;
3457
3458     /* Get maximum and expected amount of records per track */
3459     rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3460     rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3461
3462     trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3463     fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3464
3465     fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3466     if (!fmt_buffer)
3467         return -ENOMEM;
3468
3469     /*
3470      * A certain FICON feature subset is needed to operate in transport
3471      * mode. Additionally, the support for transport mode is implicitly
3472      * checked by comparing the buffer size with fcx_max_data. As long as
3473      * the buffer size is smaller we can operate in transport mode and
3474      * process multiple tracks. If not, only one track at once is being
3475      * processed using command mode.
3476      */
3477     if ((private->features.feature[40] & 0x04) &&
3478         fmt_buffer_size <= private->fcx_max_data)
3479         tpm = 1;
3480
3481     rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3482                        tpm, fmt_buffer, rpt_max, &irb);
3483     if (rc && rc != -EIO)
3484         goto out;
3485     if (rc == -EIO) {
3486         /*
3487          * If our first attempt with transport mode enabled comes back
3488          * with an incorrect length error, we're going to retry the
3489          * check with command mode.
3490          */
3491         if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3492             tpm = 0;
3493             rc = dasd_eckd_format_process_data(base, &cdata->expect,
3494                                enable_pav, tpm,
3495                                fmt_buffer, rpt_max,
3496                                &irb);
3497             if (rc)
3498                 goto out;
3499         } else {
3500             goto out;
3501         }
3502     }
3503
3504     dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3505                      trk_per_cyl, tpm);
3506
3507 out:
3508     kfree(fmt_buffer);
3509
3510     return rc;
3511 }
3512
3513 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3514 {
3515     if (cqr->retries < 0) {
3516         cqr->status = DASD_CQR_FAILED;
3517         return;
3518     }
3519     cqr->status = DASD_CQR_FILLED;
3520     if (cqr->block && (cqr->startdev != cqr->block->base)) {
3521         dasd_eckd_reset_ccw_to_base_io(cqr);
3522         cqr->startdev = cqr->block->base;
3523         cqr->lpm = dasd_path_get_opm(cqr->block->base);
3524     }
3525 };
3526
3527 static dasd_erp_fn_t
3528 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3529 {
3530     struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3531     struct ccw_device *cdev = device->cdev;
3532
3533     switch (cdev->id.cu_type) {
3534     case 0x3990:
3535     case 0x2105:
3536     case 0x2107:
3537     case 0x1750:
3538         return dasd_3990_erp_action;
3539     case 0x9343:
3540     case 0x3880:
3541     default:
3542         return dasd_default_erp_action;
3543     }
3544 }
3545
3546 static dasd_erp_fn_t
3547 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3548 {
3549     return dasd_default_erp_postaction;
3550 }
3551
3552 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3553                           struct dasd_ccw_req *cqr,
3554                           struct irb *irb)
3555 {
3556     char mask;
3557     char *sense = NULL;
3558     struct dasd_eckd_private *private = device->private;
3559
3560     /* first of all check for state change pending interrupt */
3561     mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3562     if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3563         /*
3564          * for alias only, not in offline processing
3565          * and only if not suspended
3566          */
3567         if (!device->block && private->lcu &&
3568             device->state == DASD_STATE_ONLINE &&
3569             !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3570             !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3571             /* schedule worker to reload device */
3572             dasd_reload_device(device);
3573         }
3574         dasd_generic_handle_state_change(device);
3575         return;
3576     }
3577
3578     sense = dasd_get_sense(irb);
3579     if (!sense)
3580         return;
3581
3582     /* summary unit check */
3583     if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3584         (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3585         if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3586             DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3587                       "eckd suc: device already notified");
3588             return;
3589         }
3590         sense = dasd_get_sense(irb);
3591         if (!sense) {
3592             DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3593                       "eckd suc: no reason code available");
3594             clear_bit(DASD_FLAG_SUC, &device->flags);
3595             return;
3596
3597         }
3598         private->suc_reason = sense[8];
3599         DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3600                   "eckd handle summary unit check: reason",
3601                   private->suc_reason);
3602         dasd_get_device(device);
3603         if (!schedule_work(&device->suc_work))
3604             dasd_put_device(device);
3605
3606         return;
3607     }
3608
3609     /* service information message SIM */
3610     if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3611         ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3612         dasd_3990_erp_handle_sim(device, sense);
3613         return;
3614     }
3615
3616     /* loss of device reservation is handled via base devices only
3617      * as alias devices may be used with several bases
3618      */
3619     if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3620         (sense[7] == 0x3F) &&
3621         (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3622         test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3623         if (device->features & DASD_FEATURE_FAILONSLCK)
3624             set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3625         clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3626         dev_err(&device->cdev->dev,
3627             "The device reservation was lost\n");
3628     }
3629 }
3630
3631 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3632                        unsigned int first_trk,
3633                        unsigned int last_trk)
3634 {
3635     struct dasd_eckd_private *private = device->private;
3636     unsigned int trks_per_vol;
3637     int rc = 0;
3638
3639     trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3640
3641     if (first_trk >= trks_per_vol) {
3642         dev_warn(&device->cdev->dev,
3643              "Start track number %u used in the space release command is too big\n",
3644              first_trk);
3645         rc = -EINVAL;
3646     } else if (last_trk >= trks_per_vol) {
3647         dev_warn(&device->cdev->dev,
3648              "Stop track number %u used in the space release command is too big\n",
3649              last_trk);
3650         rc = -EINVAL;
3651     } else if (first_trk > last_trk) {
3652         dev_warn(&device->cdev->dev,
3653              "Start track %u used in the space release command exceeds the end track\n",
3654              first_trk);
3655         rc = -EINVAL;
3656     }
3657     return rc;
3658 }
3659
3660 /*
3661  * Helper function to count the amount of involved extents within a given range
3662  * with extent alignment in mind.
3663  */
3664 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3665 {
3666     int cur_pos = 0;
3667     int count = 0;
3668     int tmp;
3669
3670     if (from == to)
3671         return 1;
3672
3673     /* Count first partial extent */
3674     if (from % trks_per_ext != 0) {
3675         tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3676         if (tmp > to)
3677             tmp = to;
3678         cur_pos = tmp - from + 1;
3679         count++;
3680     }
3681     /* Count full extents */
3682     if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3683         tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3684         count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3685         cur_pos = tmp;
3686     }
3687     /* Count last partial extent */
3688     if (cur_pos < to)
3689         count++;
3690
3691     return count;
3692 }
3693
3694 /*
3695  * Release allocated space for a given range or an entire volume.
3696  */
3697 static struct dasd_ccw_req *
3698 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3699           struct request *req, unsigned int first_trk,
3700           unsigned int last_trk, int by_extent)
3701 {
3702     struct dasd_eckd_private *private = device->private;
3703     struct dasd_dso_ras_ext_range *ras_range;
3704     struct dasd_rssd_features *features;
3705     struct dasd_dso_ras_data *ras_data;
3706     u16 heads, beg_head, end_head;
3707     int cur_to_trk, cur_from_trk;
3708     struct dasd_ccw_req *cqr;
3709     u32 beg_cyl, end_cyl;
3710     struct ccw1 *ccw;
3711     int trks_per_ext;
3712     size_t ras_size;
3713     size_t size;
3714     int nr_exts;
3715     void *rq;
3716     int i;
3717
3718     if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3719         return ERR_PTR(-EINVAL);
3720
3721     rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3722
3723     features = &private->features;
3724
3725     trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3726     nr_exts = 0;
3727     if (by_extent)
3728         nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3729     ras_size = sizeof(*ras_data);
3730     size = ras_size + (nr_exts * sizeof(*ras_range));
3731
3732     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3733     if (IS_ERR(cqr)) {
3734         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3735                 "Could not allocate RAS request");
3736         return cqr;
3737     }
3738
3739     ras_data = cqr->data;
3740     memset(ras_data, 0, size);
3741
3742     ras_data->order = DSO_ORDER_RAS;
3743     ras_data->flags.vol_type = 0; /* CKD volume */
3744     /* Release specified extents or entire volume */
3745     ras_data->op_flags.by_extent = by_extent;
3746     /*
3747      * This bit guarantees initialisation of tracks within an extent that is
3748      * not fully specified, but is only supported with a certain feature
3749      * subset.
3750      */
3751     ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
3752     ras_data->lss = private->conf.ned->ID;
3753     ras_data->dev_addr = private->conf.ned->unit_addr;
3754     ras_data->nr_exts = nr_exts;
3755
3756     if (by_extent) {
3757         heads = private->rdc_data.trk_per_cyl;
3758         cur_from_trk = first_trk;
3759         cur_to_trk = first_trk + trks_per_ext -
3760             (first_trk % trks_per_ext) - 1;
3761         if (cur_to_trk > last_trk)
3762             cur_to_trk = last_trk;
3763         ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3764
3765         for (i = 0; i < nr_exts; i++) {
3766             beg_cyl = cur_from_trk / heads;
3767             beg_head = cur_from_trk % heads;
3768             end_cyl = cur_to_trk / heads;
3769             end_head = cur_to_trk % heads;
3770
3771             set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3772             set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3773
3774             cur_from_trk = cur_to_trk + 1;
3775             cur_to_trk = cur_from_trk + trks_per_ext - 1;
3776             if (cur_to_trk > last_trk)
3777                 cur_to_trk = last_trk;
3778             ras_range++;
3779         }
3780     }
3781
3782     ccw = cqr->cpaddr;
3783     ccw->cda = (__u32)(addr_t)cqr->data;
3784     ccw->cmd_code = DASD_ECKD_CCW_DSO;
3785     ccw->count = size;
3786
3787     cqr->startdev = device;
3788     cqr->memdev = device;
3789     cqr->block = block;
3790     cqr->retries = 256;
3791     cqr->expires = device->default_expires * HZ;
3792     cqr->buildclk = get_tod_clock();
3793     cqr->status = DASD_CQR_FILLED;
3794
3795     return cqr;
3796 }
3797
3798 static int dasd_eckd_release_space_full(struct dasd_device *device)
3799 {
3800     struct dasd_ccw_req *cqr;
3801     int rc;
3802
3803     cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3804     if (IS_ERR(cqr))
3805         return PTR_ERR(cqr);
3806
3807     rc = dasd_sleep_on_interruptible(cqr);
3808
3809     dasd_sfree_request(cqr, cqr->memdev);
3810
3811     return rc;
3812 }
3813
3814 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3815                     unsigned int from, unsigned int to)
3816 {
3817     struct dasd_eckd_private *private = device->private;
3818     struct dasd_block *block = device->block;
3819     struct dasd_ccw_req *cqr, *n;
3820     struct list_head ras_queue;
3821     unsigned int device_exts;
3822     int trks_per_ext;
3823     int stop, step;
3824     int cur_pos;
3825     int rc = 0;
3826     int retry;
3827
3828     INIT_LIST_HEAD(&ras_queue);
3829
3830     device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3831     trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3832
3833     /* Make sure device limits are not exceeded */
3834     step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3835     cur_pos = from;
3836
3837     do {
3838         retry = 0;
3839         while (cur_pos < to) {
3840             stop = cur_pos + step -
3841                 ((cur_pos + step) % trks_per_ext) - 1;
3842             if (stop > to)
3843                 stop = to;
3844
3845             cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3846             if (IS_ERR(cqr)) {
3847                 rc = PTR_ERR(cqr);
3848                 if (rc == -ENOMEM) {
3849                     if (list_empty(&ras_queue))
3850                         goto out;
3851                     retry = 1;
3852                     break;
3853                 }
3854                 goto err_out;
3855             }
3856
3857             spin_lock_irq(&block->queue_lock);
3858             list_add_tail(&cqr->blocklist, &ras_queue);
3859             spin_unlock_irq(&block->queue_lock);
3860             cur_pos = stop + 1;
3861         }
3862
3863         rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3864
3865 err_out:
3866         list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3867             device = cqr->startdev;
3868             private = device->private;
3869
3870             spin_lock_irq(&block->queue_lock);
3871             list_del_init(&cqr->blocklist);
3872             spin_unlock_irq(&block->queue_lock);
3873             dasd_sfree_request(cqr, device);
3874             private->count--;
3875         }
3876     } while (retry);
3877
3878 out:
3879     return rc;
3880 }
3881
3882 static int dasd_eckd_release_space(struct dasd_device *device,
3883                    struct format_data_t *rdata)
3884 {
3885     if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3886         return dasd_eckd_release_space_full(device);
3887     else if (rdata->intensity == 0)
3888         return dasd_eckd_release_space_trks(device, rdata->start_unit,
3889                             rdata->stop_unit);
3890     else
3891         return -EINVAL;
3892 }
3893
3894 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3895                            struct dasd_device *startdev,
3896                            struct dasd_block *block,
3897                            struct request *req,
3898                            sector_t first_rec,
3899                            sector_t last_rec,
3900                            sector_t first_trk,
3901                            sector_t last_trk,
3902                            unsigned int first_offs,
3903                            unsigned int last_offs,
3904                            unsigned int blk_per_trk,
3905                            unsigned int blksize)
3906 {
3907     struct dasd_eckd_private *private;
3908     unsigned long *idaws;
3909     struct LO_eckd_data *LO_data;
3910     struct dasd_ccw_req *cqr;
3911     struct ccw1 *ccw;
3912     struct req_iterator iter;
3913     struct bio_vec bv;
3914     char *dst;
3915     unsigned int off;
3916     int count, cidaw, cplength, datasize;
3917     sector_t recid;
3918     unsigned char cmd, rcmd;
3919     int use_prefix;
3920     struct dasd_device *basedev;
3921
3922     basedev = block->base;
3923     private = basedev->private;
3924     if (rq_data_dir(req) == READ)
3925         cmd = DASD_ECKD_CCW_READ_MT;
3926     else if (rq_data_dir(req) == WRITE)
3927         cmd = DASD_ECKD_CCW_WRITE_MT;
3928     else
3929         return ERR_PTR(-EINVAL);
3930
3931     /* Check struct bio and count the number of blocks for the request. */
3932     count = 0;
3933     cidaw = 0;
3934     rq_for_each_segment(bv, req, iter) {
3935         if (bv.bv_len & (blksize - 1))
3936             /* Eckd can only do full blocks. */
3937             return ERR_PTR(-EINVAL);
3938         count += bv.bv_len >> (block->s2b_shift + 9);
3939         if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3940             cidaw += bv.bv_len >> (block->s2b_shift + 9);
3941     }
3942     /* Paranoia. */
3943     if (count != last_rec - first_rec + 1)
3944         return ERR_PTR(-EINVAL);
3945
3946     /* use the prefix command if available */
3947     use_prefix = private->features.feature[8] & 0x01;
3948     if (use_prefix) {
3949         /* 1x prefix + number of blocks */
3950         cplength = 2 + count;
3951         /* 1x prefix + cidaws*sizeof(long) */
3952         datasize = sizeof(struct PFX_eckd_data) +
3953             sizeof(struct LO_eckd_data) +
3954             cidaw * sizeof(unsigned long);
3955     } else {
3956         /* 1x define extent + 1x locate record + number of blocks */
3957         cplength = 2 + count;
3958         /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3959         datasize = sizeof(struct DE_eckd_data) +
3960             sizeof(struct LO_eckd_data) +
3961             cidaw * sizeof(unsigned long);
3962     }
3963     /* Find out the number of additional locate record ccws for cdl. */
3964     if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3965         if (last_rec >= 2*blk_per_trk)
3966             count = 2*blk_per_trk - first_rec;
3967         cplength += count;
3968         datasize += count*sizeof(struct LO_eckd_data);
3969     }
3970     /* Allocate the ccw request. */
3971     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3972                    startdev, blk_mq_rq_to_pdu(req));
3973     if (IS_ERR(cqr))
3974         return cqr;
3975     ccw = cqr->cpaddr;
3976     /* First ccw is define extent or prefix. */
3977     if (use_prefix) {
3978         if (prefix(ccw++, cqr->data, first_trk,
3979                last_trk, cmd, basedev, startdev) == -EAGAIN) {
3980             /* Clock not in sync and XRC is enabled.
3981              * Try again later.
3982              */
3983             dasd_sfree_request(cqr, startdev);
3984             return ERR_PTR(-EAGAIN);
3985         }
3986         idaws = (unsigned long *) (cqr->data +
3987                        sizeof(struct PFX_eckd_data));
3988     } else {
3989         if (define_extent(ccw++, cqr->data, first_trk,
3990                   last_trk, cmd, basedev, 0) == -EAGAIN) {
3991             /* Clock not in sync and XRC is enabled.
3992              * Try again later.
3993              */
3994             dasd_sfree_request(cqr, startdev);
3995             return ERR_PTR(-EAGAIN);
3996         }
3997         idaws = (unsigned long *) (cqr->data +
3998                        sizeof(struct DE_eckd_data));
3999     }
4000     /* Build locate_record+read/write/ccws. */
4001     LO_data = (struct LO_eckd_data *) (idaws + cidaw);
4002     recid = first_rec;
4003     if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
4004         /* Only standard blocks so there is just one locate record. */
4005         ccw[-1].flags |= CCW_FLAG_CC;
4006         locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
4007                   last_rec - recid + 1, cmd, basedev, blksize);
4008     }
4009     rq_for_each_segment(bv, req, iter) {
4010         dst = bvec_virt(&bv);
4011         if (dasd_page_cache) {
4012             char *copy = kmem_cache_alloc(dasd_page_cache,
4013                               GFP_DMA | __GFP_NOWARN);
4014             if (copy && rq_data_dir(req) == WRITE)
4015                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
4016             if (copy)
4017                 dst = copy + bv.bv_offset;
4018         }
4019         for (off = 0; off < bv.bv_len; off += blksize) {
4020             sector_t trkid = recid;
4021             unsigned int recoffs = sector_div(trkid, blk_per_trk);
4022             rcmd = cmd;
4023             count = blksize;
4024             /* Locate record for cdl special block ? */
4025             if (private->uses_cdl && recid < 2*blk_per_trk) {
4026                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
4027                     rcmd |= 0x8;
4028                     count = dasd_eckd_cdl_reclen(recid);
4029                     if (count < blksize &&
4030                         rq_data_dir(req) == READ)
4031                         memset(dst + count, 0xe5,
4032                                blksize - count);
4033                 }
4034                 ccw[-1].flags |= CCW_FLAG_CC;
4035                 locate_record(ccw++, LO_data++,
4036                           trkid, recoffs + 1,
4037                           1, rcmd, basedev, count);
4038             }
4039             /* Locate record for standard blocks ? */
4040             if (private->uses_cdl && recid == 2*blk_per_trk) {
4041                 ccw[-1].flags |= CCW_FLAG_CC;
4042                 locate_record(ccw++, LO_data++,
4043                           trkid, recoffs + 1,
4044                           last_rec - recid + 1,
4045                           cmd, basedev, count);
4046             }
4047             /* Read/write ccw. */
4048             ccw[-1].flags |= CCW_FLAG_CC;
4049             ccw->cmd_code = rcmd;
4050             ccw->count = count;
4051             if (idal_is_needed(dst, blksize)) {
4052                 ccw->cda = (__u32)(addr_t) idaws;
4053                 ccw->flags = CCW_FLAG_IDA;
4054                 idaws = idal_create_words(idaws, dst, blksize);
4055             } else {
4056                 ccw->cda = (__u32)(addr_t) dst;
4057                 ccw->flags = 0;
4058             }
4059             ccw++;
4060             dst += blksize;
4061             recid++;
4062         }
4063     }
4064     if (blk_noretry_request(req) ||
4065         block->base->features & DASD_FEATURE_FAILFAST)
4066         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4067     cqr->startdev = startdev;
4068     cqr->memdev = startdev;
4069     cqr->block = block;
4070     cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4071     cqr->lpm = dasd_path_get_ppm(startdev);
4072     cqr->retries = startdev->default_retries;
4073     cqr->buildclk = get_tod_clock();
4074     cqr->status = DASD_CQR_FILLED;
4075
4076     /* Set flags to suppress output for expected errors */
4077     if (dasd_eckd_is_ese(basedev)) {
4078         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4079         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4080         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4081     }
4082
4083     return cqr;
4084 }
4085
4086 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4087                            struct dasd_device *startdev,
4088                            struct dasd_block *block,
4089                            struct request *req,
4090                            sector_t first_rec,
4091                            sector_t last_rec,
4092                            sector_t first_trk,
4093                            sector_t last_trk,
4094                            unsigned int first_offs,
4095                            unsigned int last_offs,
4096                            unsigned int blk_per_trk,
4097                            unsigned int blksize)
4098 {
4099     unsigned long *idaws;
4100     struct dasd_ccw_req *cqr;
4101     struct ccw1 *ccw;
4102     struct req_iterator iter;
4103     struct bio_vec bv;
4104     char *dst, *idaw_dst;
4105     unsigned int cidaw, cplength, datasize;
4106     unsigned int tlf;
4107     sector_t recid;
4108     unsigned char cmd;
4109     struct dasd_device *basedev;
4110     unsigned int trkcount, count, count_to_trk_end;
4111     unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4112     unsigned char new_track, end_idaw;
4113     sector_t trkid;
4114     unsigned int recoffs;
4115
4116     basedev = block->base;
4117     if (rq_data_dir(req) == READ)
4118         cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4119     else if (rq_data_dir(req) == WRITE)
4120         cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4121     else
4122         return ERR_PTR(-EINVAL);
4123
4124     /* Track based I/O needs IDAWs for each page, and not just for
4125      * 64 bit addresses. We need additional idals for pages
4126      * that get filled from two tracks, so we use the number
4127      * of records as upper limit.
4128      */
4129     cidaw = last_rec - first_rec + 1;
4130     trkcount = last_trk - first_trk + 1;
4131
4132     /* 1x prefix + one read/write ccw per track */
4133     cplength = 1 + trkcount;
4134
4135     datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4136
4137     /* Allocate the ccw request. */
4138     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4139                    startdev, blk_mq_rq_to_pdu(req));
4140     if (IS_ERR(cqr))
4141         return cqr;
4142     ccw = cqr->cpaddr;
4143     /* transfer length factor: how many bytes to read from the last track */
4144     if (first_trk == last_trk)
4145         tlf = last_offs - first_offs + 1;
4146     else
4147         tlf = last_offs + 1;
4148     tlf *= blksize;
4149
4150     if (prefix_LRE(ccw++, cqr->data, first_trk,
4151                last_trk, cmd, basedev, startdev,
4152                1 /* format */, first_offs + 1,
4153                trkcount, blksize,
4154                tlf) == -EAGAIN) {
4155         /* Clock not in sync and XRC is enabled.
4156          * Try again later.
4157          */
4158         dasd_sfree_request(cqr, startdev);
4159         return ERR_PTR(-EAGAIN);
4160     }
4161
4162     /*
4163      * The translation of request into ccw programs must meet the
4164      * following conditions:
4165      * - all idaws but the first and the last must address full pages
4166      *   (or 2K blocks on 31-bit)
4167      * - the scope of a ccw and it's idal ends with the track boundaries
4168      */
4169     idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4170     recid = first_rec;
4171     new_track = 1;
4172     end_idaw = 0;
4173     len_to_track_end = 0;
4174     idaw_dst = NULL;
4175     idaw_len = 0;
4176     rq_for_each_segment(bv, req, iter) {
4177         dst = bvec_virt(&bv);
4178         seg_len = bv.bv_len;
4179         while (seg_len) {
4180             if (new_track) {
4181                 trkid = recid;
4182                 recoffs = sector_div(trkid, blk_per_trk);
4183                 count_to_trk_end = blk_per_trk - recoffs;
4184                 count = min((last_rec - recid + 1),
4185                         (sector_t)count_to_trk_end);
4186                 len_to_track_end = count * blksize;
4187                 ccw[-1].flags |= CCW_FLAG_CC;
4188                 ccw->cmd_code = cmd;
4189                 ccw->count = len_to_track_end;
4190                 ccw->cda = (__u32)(addr_t)idaws;
4191                 ccw->flags = CCW_FLAG_IDA;
4192                 ccw++;
4193                 recid += count;
4194                 new_track = 0;
4195                 /* first idaw for a ccw may start anywhere */
4196                 if (!idaw_dst)
4197                     idaw_dst = dst;
4198             }
4199             /* If we start a new idaw, we must make sure that it
4200              * starts on an IDA_BLOCK_SIZE boundary.
4201              * If we continue an idaw, we must make sure that the
4202              * current segment begins where the so far accumulated
4203              * idaw ends
4204              */
4205             if (!idaw_dst) {
4206                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
4207                     dasd_sfree_request(cqr, startdev);
4208                     return ERR_PTR(-ERANGE);
4209                 } else
4210                     idaw_dst = dst;
4211             }
4212             if ((idaw_dst + idaw_len) != dst) {
4213                 dasd_sfree_request(cqr, startdev);
4214                 return ERR_PTR(-ERANGE);
4215             }
4216             part_len = min(seg_len, len_to_track_end);
4217             seg_len -= part_len;
4218             dst += part_len;
4219             idaw_len += part_len;
4220             len_to_track_end -= part_len;
4221             /* collected memory area ends on an IDA_BLOCK border,
4222              * -> create an idaw
4223              * idal_create_words will handle cases where idaw_len
4224              * is larger then IDA_BLOCK_SIZE
4225              */
4226             if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
4227                 end_idaw = 1;
4228             /* We also need to end the idaw at track end */
4229             if (!len_to_track_end) {
4230                 new_track = 1;
4231                 end_idaw = 1;
4232             }
4233             if (end_idaw) {
4234                 idaws = idal_create_words(idaws, idaw_dst,
4235                               idaw_len);
4236                 idaw_dst = NULL;
4237                 idaw_len = 0;
4238                 end_idaw = 0;
4239             }
4240         }
4241     }
4242
4243     if (blk_noretry_request(req) ||
4244         block->base->features & DASD_FEATURE_FAILFAST)
4245         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4246     cqr->startdev = startdev;
4247     cqr->memdev = startdev;
4248     cqr->block = block;
4249     cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4250     cqr->lpm = dasd_path_get_ppm(startdev);
4251     cqr->retries = startdev->default_retries;
4252     cqr->buildclk = get_tod_clock();
4253     cqr->status = DASD_CQR_FILLED;
4254
4255     /* Set flags to suppress output for expected errors */
4256     if (dasd_eckd_is_ese(basedev))
4257         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4258
4259     return cqr;
4260 }
4261
4262 static int prepare_itcw(struct itcw *itcw,
4263             unsigned int trk, unsigned int totrk, int cmd,
4264             struct dasd_device *basedev,
4265             struct dasd_device *startdev,
4266             unsigned int rec_on_trk, int count,
4267             unsigned int blksize,
4268             unsigned int total_data_size,
4269             unsigned int tlf,
4270             unsigned int blk_per_trk)
4271 {
4272     struct PFX_eckd_data pfxdata;
4273     struct dasd_eckd_private *basepriv, *startpriv;
4274     struct DE_eckd_data *dedata;
4275     struct LRE_eckd_data *lredata;
4276     struct dcw *dcw;
4277
4278     u32 begcyl, endcyl;
4279     u16 heads, beghead, endhead;
4280     u8 pfx_cmd;
4281
4282     int rc = 0;
4283     int sector = 0;
4284     int dn, d;
4285
4286
4287     /* setup prefix data */
4288     basepriv = basedev->private;
4289     startpriv = startdev->private;
4290     dedata = &pfxdata.define_extent;
4291     lredata = &pfxdata.locate_record;
4292
4293     memset(&pfxdata, 0, sizeof(pfxdata));
4294     pfxdata.format = 1; /* PFX with LRE */
4295     pfxdata.base_address = basepriv->conf.ned->unit_addr;
4296     pfxdata.base_lss = basepriv->conf.ned->ID;
4297     pfxdata.validity.define_extent = 1;
4298
4299     /* private uid is kept up to date, conf_data may be outdated */
4300     if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4301         pfxdata.validity.verify_base = 1;
4302
4303     if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4304         pfxdata.validity.verify_base = 1;
4305         pfxdata.validity.hyper_pav = 1;
4306     }
4307
4308     switch (cmd) {
4309     case DASD_ECKD_CCW_READ_TRACK_DATA:
4310         dedata->mask.perm = 0x1;
4311         dedata->attributes.operation = basepriv->attrib.operation;
4312         dedata->blk_size = blksize;
4313         dedata->ga_extended |= 0x42;
4314         lredata->operation.orientation = 0x0;
4315         lredata->operation.operation = 0x0C;
4316         lredata->auxiliary.check_bytes = 0x01;
4317         pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4318         break;
4319     case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4320         dedata->mask.perm = 0x02;
4321         dedata->attributes.operation = basepriv->attrib.operation;
4322         dedata->blk_size = blksize;
4323         rc = set_timestamp(NULL, dedata, basedev);
4324         dedata->ga_extended |= 0x42;
4325         lredata->operation.orientation = 0x0;
4326         lredata->operation.operation = 0x3F;
4327         lredata->extended_operation = 0x23;
4328         lredata->auxiliary.check_bytes = 0x2;
4329         /*
4330          * If XRC is supported the System Time Stamp is set. The
4331          * validity of the time stamp must be reflected in the prefix
4332          * data as well.
4333          */
4334         if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4335             pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4336         pfx_cmd = DASD_ECKD_CCW_PFX;
4337         break;
4338     case DASD_ECKD_CCW_READ_COUNT_MT:
4339         dedata->mask.perm = 0x1;
4340         dedata->attributes.operation = DASD_BYPASS_CACHE;
4341         dedata->ga_extended |= 0x42;
4342         dedata->blk_size = blksize;
4343         lredata->operation.orientation = 0x2;
4344         lredata->operation.operation = 0x16;
4345         lredata->auxiliary.check_bytes = 0x01;
4346         pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4347         break;
4348     default:
4349         DBF_DEV_EVENT(DBF_ERR, basedev,
4350                   "prepare itcw, unknown opcode 0x%x", cmd);
4351         BUG();
4352         break;
4353     }
4354     if (rc)
4355         return rc;
4356
4357     dedata->attributes.mode = 0x3;  /* ECKD */
4358
4359     heads = basepriv->rdc_data.trk_per_cyl;
4360     begcyl = trk / heads;
4361     beghead = trk % heads;
4362     endcyl = totrk / heads;
4363     endhead = totrk % heads;
4364
4365     /* check for sequential prestage - enhance cylinder range */
4366     if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4367         dedata->attributes.operation == DASD_SEQ_ACCESS) {
4368
4369         if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4370             endcyl += basepriv->attrib.nr_cyl;
4371         else
4372             endcyl = (basepriv->real_cyl - 1);
4373     }
4374
4375     set_ch_t(&dedata->beg_ext, begcyl, beghead);
4376     set_ch_t(&dedata->end_ext, endcyl, endhead);
4377
4378     dedata->ep_format = 0x20; /* records per track is valid */
4379     dedata->ep_rec_per_track = blk_per_trk;
4380
4381     if (rec_on_trk) {
4382         switch (basepriv->rdc_data.dev_type) {
4383         case 0x3390:
4384             dn = ceil_quot(blksize + 6, 232);
4385             d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4386             sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4387             break;
4388         case 0x3380:
4389             d = 7 + ceil_quot(blksize + 12, 32);
4390             sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4391             break;
4392         }
4393     }
4394
4395     if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4396         lredata->auxiliary.length_valid = 0;
4397         lredata->auxiliary.length_scope = 0;
4398         lredata->sector = 0xff;
4399     } else {
4400         lredata->auxiliary.length_valid = 1;
4401         lredata->auxiliary.length_scope = 1;
4402         lredata->sector = sector;
4403     }
4404     lredata->auxiliary.imbedded_ccw_valid = 1;
4405     lredata->length = tlf;
4406     lredata->imbedded_ccw = cmd;
4407     lredata->count = count;
4408     set_ch_t(&lredata->seek_addr, begcyl, beghead);
4409     lredata->search_arg.cyl = lredata->seek_addr.cyl;
4410     lredata->search_arg.head = lredata->seek_addr.head;
4411     lredata->search_arg.record = rec_on_trk;
4412
4413     dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4414              &pfxdata, sizeof(pfxdata), total_data_size);
4415     return PTR_ERR_OR_ZERO(dcw);
4416 }
4417
4418 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4419                            struct dasd_device *startdev,
4420                            struct dasd_block *block,
4421                            struct request *req,
4422                            sector_t first_rec,
4423                            sector_t last_rec,
4424                            sector_t first_trk,
4425                            sector_t last_trk,
4426                            unsigned int first_offs,
4427                            unsigned int last_offs,
4428                            unsigned int blk_per_trk,
4429                            unsigned int blksize)
4430 {
4431     struct dasd_ccw_req *cqr;
4432     struct req_iterator iter;
4433     struct bio_vec bv;
4434     char *dst;
4435     unsigned int trkcount, ctidaw;
4436     unsigned char cmd;
4437     struct dasd_device *basedev;
4438     unsigned int tlf;
4439     struct itcw *itcw;
4440     struct tidaw *last_tidaw = NULL;
4441     int itcw_op;
4442     size_t itcw_size;
4443     u8 tidaw_flags;
4444     unsigned int seg_len, part_len, len_to_track_end;
4445     unsigned char new_track;
4446     sector_t recid, trkid;
4447     unsigned int offs;
4448     unsigned int count, count_to_trk_end;
4449     int ret;
4450
4451     basedev = block->base;
4452     if (rq_data_dir(req) == READ) {
4453         cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4454         itcw_op = ITCW_OP_READ;
4455     } else if (rq_data_dir(req) == WRITE) {
4456         cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4457         itcw_op = ITCW_OP_WRITE;
4458     } else
4459         return ERR_PTR(-EINVAL);
4460
4461     /* trackbased I/O needs address all memory via TIDAWs,
4462      * not just for 64 bit addresses. This allows us to map
4463      * each segment directly to one tidaw.
4464      * In the case of write requests, additional tidaws may
4465      * be needed when a segment crosses a track boundary.
4466      */
4467     trkcount = last_trk - first_trk + 1;
4468     ctidaw = 0;
4469     rq_for_each_segment(bv, req, iter) {
4470         ++ctidaw;
4471     }
4472     if (rq_data_dir(req) == WRITE)
4473         ctidaw += (last_trk - first_trk);
4474
4475     /* Allocate the ccw request. */
4476     itcw_size = itcw_calc_size(0, ctidaw, 0);
4477     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4478                    blk_mq_rq_to_pdu(req));
4479     if (IS_ERR(cqr))
4480         return cqr;
4481
4482     /* transfer length factor: how many bytes to read from the last track */
4483     if (first_trk == last_trk)
4484         tlf = last_offs - first_offs + 1;
4485     else
4486         tlf = last_offs + 1;
4487     tlf *= blksize;
4488
4489     itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4490     if (IS_ERR(itcw)) {
4491         ret = -EINVAL;
4492         goto out_error;
4493     }
4494     cqr->cpaddr = itcw_get_tcw(itcw);
4495     if (prepare_itcw(itcw, first_trk, last_trk,
4496              cmd, basedev, startdev,
4497              first_offs + 1,
4498              trkcount, blksize,
4499              (last_rec - first_rec + 1) * blksize,
4500              tlf, blk_per_trk) == -EAGAIN) {
4501         /* Clock not in sync and XRC is enabled.
4502          * Try again later.
4503          */
4504         ret = -EAGAIN;
4505         goto out_error;
4506     }
4507     len_to_track_end = 0;
4508     /*
4509      * A tidaw can address 4k of memory, but must not cross page boundaries
4510      * We can let the block layer handle this by setting
4511      * blk_queue_segment_boundary to page boundaries and
4512      * blk_max_segment_size to page size when setting up the request queue.
4513      * For write requests, a TIDAW must not cross track boundaries, because
4514      * we have to set the CBC flag on the last tidaw for each track.
4515      */
4516     if (rq_data_dir(req) == WRITE) {
4517         new_track = 1;
4518         recid = first_rec;
4519         rq_for_each_segment(bv, req, iter) {
4520             dst = bvec_virt(&bv);
4521             seg_len = bv.bv_len;
4522             while (seg_len) {
4523                 if (new_track) {
4524                     trkid = recid;
4525                     offs = sector_div(trkid, blk_per_trk);
4526                     count_to_trk_end = blk_per_trk - offs;
4527                     count = min((last_rec - recid + 1),
4528                             (sector_t)count_to_trk_end);
4529                     len_to_track_end = count * blksize;
4530                     recid += count;
4531                     new_track = 0;
4532                 }
4533                 part_len = min(seg_len, len_to_track_end);
4534                 seg_len -= part_len;
4535                 len_to_track_end -= part_len;
4536                 /* We need to end the tidaw at track end */
4537                 if (!len_to_track_end) {
4538                     new_track = 1;
4539                     tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4540                 } else
4541                     tidaw_flags = 0;
4542                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4543                                 dst, part_len);
4544                 if (IS_ERR(last_tidaw)) {
4545                     ret = -EINVAL;
4546                     goto out_error;
4547                 }
4548                 dst += part_len;
4549             }
4550         }
4551     } else {
4552         rq_for_each_segment(bv, req, iter) {
4553             dst = bvec_virt(&bv);
4554             last_tidaw = itcw_add_tidaw(itcw, 0x00,
4555                             dst, bv.bv_len);
4556             if (IS_ERR(last_tidaw)) {
4557                 ret = -EINVAL;
4558                 goto out_error;
4559             }
4560         }
4561     }
4562     last_tidaw->flags |= TIDAW_FLAGS_LAST;
4563     last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4564     itcw_finalize(itcw);
4565
4566     if (blk_noretry_request(req) ||
4567         block->base->features & DASD_FEATURE_FAILFAST)
4568         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4569     cqr->cpmode = 1;
4570     cqr->startdev = startdev;
4571     cqr->memdev = startdev;
4572     cqr->block = block;
4573     cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4574     cqr->lpm = dasd_path_get_ppm(startdev);
4575     cqr->retries = startdev->default_retries;
4576     cqr->buildclk = get_tod_clock();
4577     cqr->status = DASD_CQR_FILLED;
4578
4579     /* Set flags to suppress output for expected errors */
4580     if (dasd_eckd_is_ese(basedev)) {
4581         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4582         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4583         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4584     }
4585
4586     return cqr;
4587 out_error:
4588     dasd_sfree_request(cqr, startdev);
4589     return ERR_PTR(ret);
4590 }
4591
4592 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4593                            struct dasd_block *block,
4594                            struct request *req)
4595 {
4596     int cmdrtd, cmdwtd;
4597     int use_prefix;
4598     int fcx_multitrack;
4599     struct dasd_eckd_private *private;
4600     struct dasd_device *basedev;
4601     sector_t first_rec, last_rec;
4602     sector_t first_trk, last_trk;
4603     unsigned int first_offs, last_offs;
4604     unsigned int blk_per_trk, blksize;
4605     int cdlspecial;
4606     unsigned int data_size;
4607     struct dasd_ccw_req *cqr;
4608
4609     basedev = block->base;
4610     private = basedev->private;
4611
4612     /* Calculate number of blocks/records per track. */
4613     blksize = block->bp_block;
4614     blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4615     if (blk_per_trk == 0)
4616         return ERR_PTR(-EINVAL);
4617     /* Calculate record id of first and last block. */
4618     first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4619     first_offs = sector_div(first_trk, blk_per_trk);
4620     last_rec = last_trk =
4621         (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4622     last_offs = sector_div(last_trk, blk_per_trk);
4623     cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4624
4625     fcx_multitrack = private->features.feature[40] & 0x20;
4626     data_size = blk_rq_bytes(req);
4627     if (data_size % blksize)
4628         return ERR_PTR(-EINVAL);
4629     /* tpm write request add CBC data on each track boundary */
4630     if (rq_data_dir(req) == WRITE)
4631         data_size += (last_trk - first_trk) * 4;
4632
4633     /* is read track data and write track data in command mode supported? */
4634     cmdrtd = private->features.feature[9] & 0x20;
4635     cmdwtd = private->features.feature[12] & 0x40;
4636     use_prefix = private->features.feature[8] & 0x01;
4637
4638     cqr = NULL;
4639     if (cdlspecial || dasd_page_cache) {
4640         /* do nothing, just fall through to the cmd mode single case */
4641     } else if ((data_size <= private->fcx_max_data)
4642            && (fcx_multitrack || (first_trk == last_trk))) {
4643         cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4644                             first_rec, last_rec,
4645                             first_trk, last_trk,
4646                             first_offs, last_offs,
4647                             blk_per_trk, blksize);
4648         if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4649             (PTR_ERR(cqr) != -ENOMEM))
4650             cqr = NULL;
4651     } else if (use_prefix &&
4652            (((rq_data_dir(req) == READ) && cmdrtd) ||
4653             ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4654         cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4655                            first_rec, last_rec,
4656                            first_trk, last_trk,
4657                            first_offs, last_offs,
4658                            blk_per_trk, blksize);
4659         if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4660             (PTR_ERR(cqr) != -ENOMEM))
4661             cqr = NULL;
4662     }
4663     if (!cqr)
4664         cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4665                             first_rec, last_rec,
4666                             first_trk, last_trk,
4667                             first_offs, last_offs,
4668                             blk_per_trk, blksize);
4669     return cqr;
4670 }
4671
4672 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4673                            struct dasd_block *block,
4674                            struct request *req)
4675 {
4676     sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4677     unsigned int seg_len, len_to_track_end;
4678     unsigned int cidaw, cplength, datasize;
4679     sector_t first_trk, last_trk, sectors;
4680     struct dasd_eckd_private *base_priv;
4681     struct dasd_device *basedev;
4682     struct req_iterator iter;
4683     struct dasd_ccw_req *cqr;
4684     unsigned int first_offs;
4685     unsigned int trkcount;
4686     unsigned long *idaws;
4687     unsigned int size;
4688     unsigned char cmd;
4689     struct bio_vec bv;
4690     struct ccw1 *ccw;
4691     int use_prefix;
4692     void *data;
4693     char *dst;
4694
4695     /*
4696      * raw track access needs to be mutiple of 64k and on 64k boundary
4697      * For read requests we can fix an incorrect alignment by padding
4698      * the request with dummy pages.
4699      */
4700     start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4701     end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4702         DASD_RAW_SECTORS_PER_TRACK;
4703     end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4704         DASD_RAW_SECTORS_PER_TRACK;
4705     basedev = block->base;
4706     if ((start_padding_sectors || end_padding_sectors) &&
4707         (rq_data_dir(req) == WRITE)) {
4708         DBF_DEV_EVENT(DBF_ERR, basedev,
4709                   "raw write not track aligned (%llu,%llu) req %p",
4710                   start_padding_sectors, end_padding_sectors, req);
4711         return ERR_PTR(-EINVAL);
4712     }
4713
4714     first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4715     last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4716         DASD_RAW_SECTORS_PER_TRACK;
4717     trkcount = last_trk - first_trk + 1;
4718     first_offs = 0;
4719
4720     if (rq_data_dir(req) == READ)
4721         cmd = DASD_ECKD_CCW_READ_TRACK;
4722     else if (rq_data_dir(req) == WRITE)
4723         cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4724     else
4725         return ERR_PTR(-EINVAL);
4726
4727     /*
4728      * Raw track based I/O needs IDAWs for each page,
4729      * and not just for 64 bit addresses.
4730      */
4731     cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4732
4733     /*
4734      * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4735      * of extended parameter. This is needed for write full track.
4736      */
4737     base_priv = basedev->private;
4738     use_prefix = base_priv->features.feature[8] & 0x01;
4739     if (use_prefix) {
4740         cplength = 1 + trkcount;
4741         size = sizeof(struct PFX_eckd_data) + 2;
4742     } else {
4743         cplength = 2 + trkcount;
4744         size = sizeof(struct DE_eckd_data) +
4745             sizeof(struct LRE_eckd_data) + 2;
4746     }
4747     size = ALIGN(size, 8);
4748
4749     datasize = size + cidaw * sizeof(unsigned long);
4750
4751     /* Allocate the ccw request. */
4752     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4753                    datasize, startdev, blk_mq_rq_to_pdu(req));
4754     if (IS_ERR(cqr))
4755         return cqr;
4756
4757     ccw = cqr->cpaddr;
4758     data = cqr->data;
4759
4760     if (use_prefix) {
4761         prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4762                startdev, 1, first_offs + 1, trkcount, 0, 0);
4763     } else {
4764         define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4765         ccw[-1].flags |= CCW_FLAG_CC;
4766
4767         data += sizeof(struct DE_eckd_data);
4768         locate_record_ext(ccw++, data, first_trk, first_offs + 1,
4769                   trkcount, cmd, basedev, 0, 0);
4770     }
4771
4772     idaws = (unsigned long *)(cqr->data + size);
4773     len_to_track_end = 0;
4774     if (start_padding_sectors) {
4775         ccw[-1].flags |= CCW_FLAG_CC;
4776         ccw->cmd_code = cmd;
4777         /* maximum 3390 track size */
4778         ccw->count = 57326;
4779         /* 64k map to one track */
4780         len_to_track_end = 65536 - start_padding_sectors * 512;
4781         ccw->cda = (__u32)(addr_t)idaws;
4782         ccw->flags |= CCW_FLAG_IDA;
4783         ccw->flags |= CCW_FLAG_SLI;
4784         ccw++;
4785         for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4786             idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4787     }
4788     rq_for_each_segment(bv, req, iter) {
4789         dst = bvec_virt(&bv);
4790         seg_len = bv.bv_len;
4791         if (cmd == DASD_ECKD_CCW_READ_TRACK)
4792             memset(dst, 0, seg_len);
4793         if (!len_to_track_end) {
4794             ccw[-1].flags |= CCW_FLAG_CC;
4795             ccw->cmd_code = cmd;
4796             /* maximum 3390 track size */
4797             ccw->count = 57326;
4798             /* 64k map to one track */
4799             len_to_track_end = 65536;
4800             ccw->cda = (__u32)(addr_t)idaws;
4801             ccw->flags |= CCW_FLAG_IDA;
4802             ccw->flags |= CCW_FLAG_SLI;
4803             ccw++;
4804         }
4805         len_to_track_end -= seg_len;
4806         idaws = idal_create_words(idaws, dst, seg_len);
4807     }
4808     for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4809         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4810     if (blk_noretry_request(req) ||
4811         block->base->features & DASD_FEATURE_FAILFAST)
4812         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4813     cqr->startdev = startdev;
4814     cqr->memdev = startdev;
4815     cqr->block = block;
4816     cqr->expires = startdev->default_expires * HZ;
4817     cqr->lpm = dasd_path_get_ppm(startdev);
4818     cqr->retries = startdev->default_retries;
4819     cqr->buildclk = get_tod_clock();
4820     cqr->status = DASD_CQR_FILLED;
4821
4822     return cqr;
4823 }
4824
4825
4826 static int
4827 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4828 {
4829     struct dasd_eckd_private *private;
4830     struct ccw1 *ccw;
4831     struct req_iterator iter;
4832     struct bio_vec bv;
4833     char *dst, *cda;
4834     unsigned int blksize, blk_per_trk, off;
4835     sector_t recid;
4836     int status;
4837
4838     if (!dasd_page_cache)
4839         goto out;
4840     private = cqr->block->base->private;
4841     blksize = cqr->block->bp_block;
4842     blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4843     recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4844     ccw = cqr->cpaddr;
4845     /* Skip over define extent & locate record. */
4846     ccw++;
4847     if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4848         ccw++;
4849     rq_for_each_segment(bv, req, iter) {
4850         dst = bvec_virt(&bv);
4851         for (off = 0; off < bv.bv_len; off += blksize) {
4852             /* Skip locate record. */
4853             if (private->uses_cdl && recid <= 2*blk_per_trk)
4854                 ccw++;
4855             if (dst) {
4856                 if (ccw->flags & CCW_FLAG_IDA)
4857                     cda = *((char **)((addr_t) ccw->cda));
4858                 else
4859                     cda = (char *)((addr_t) ccw->cda);
4860                 if (dst != cda) {
4861                     if (rq_data_dir(req) == READ)
4862                         memcpy(dst, cda, bv.bv_len);
4863                     kmem_cache_free(dasd_page_cache,
4864                         (void *)((addr_t)cda & PAGE_MASK));
4865                 }
4866                 dst = NULL;
4867             }
4868             ccw++;
4869             recid++;
4870         }
4871     }
4872 out:
4873     status = cqr->status == DASD_CQR_DONE;
4874     dasd_sfree_request(cqr, cqr->memdev);
4875     return status;
4876 }
4877
4878 /*
4879  * Modify ccw/tcw in cqr so it can be started on a base device.
4880  *
4881  * Note that this is not enough to restart the cqr!
4882  * Either reset cqr->startdev as well (summary unit check handling)
4883  * or restart via separate cqr (as in ERP handling).
4884  */
4885 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4886 {
4887     struct ccw1 *ccw;
4888     struct PFX_eckd_data *pfxdata;
4889     struct tcw *tcw;
4890     struct tccb *tccb;
4891     struct dcw *dcw;
4892
4893     if (cqr->cpmode == 1) {
4894         tcw = cqr->cpaddr;
4895         tccb = tcw_get_tccb(tcw);
4896         dcw = (struct dcw *)&tccb->tca[0];
4897         pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4898         pfxdata->validity.verify_base = 0;
4899         pfxdata->validity.hyper_pav = 0;
4900     } else {
4901         ccw = cqr->cpaddr;
4902         pfxdata = cqr->data;
4903         if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4904             pfxdata->validity.verify_base = 0;
4905             pfxdata->validity.hyper_pav = 0;
4906         }
4907     }
4908 }
4909
4910 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4911
4912 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4913                              struct dasd_block *block,
4914                              struct request *req)
4915 {
4916     struct dasd_eckd_private *private;
4917     struct dasd_device *startdev;
4918     unsigned long flags;
4919     struct dasd_ccw_req *cqr;
4920
4921     startdev = dasd_alias_get_start_dev(base);
4922     if (!startdev)
4923         startdev = base;
4924     private = startdev->private;
4925     if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4926         return ERR_PTR(-EBUSY);
4927
4928     spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4929     private->count++;
4930     if ((base->features & DASD_FEATURE_USERAW))
4931         cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4932     else
4933         cqr = dasd_eckd_build_cp(startdev, block, req);
4934     if (IS_ERR(cqr))
4935         private->count--;
4936     spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4937     return cqr;
4938 }
4939
4940 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4941                    struct request *req)
4942 {
4943     struct dasd_eckd_private *private;
4944     unsigned long flags;
4945
4946     spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4947     private = cqr->memdev->private;
4948     private->count--;
4949     spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4950     return dasd_eckd_free_cp(cqr, req);
4951 }
4952
4953 static int
4954 dasd_eckd_fill_info(struct dasd_device * device,
4955             struct dasd_information2_t * info)
4956 {
4957     struct dasd_eckd_private *private = device->private;
4958
4959     info->label_block = 2;
4960     info->FBA_layout = private->uses_cdl ? 0 : 1;
4961     info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4962     info->characteristics_size = sizeof(private->rdc_data);
4963     memcpy(info->characteristics, &private->rdc_data,
4964            sizeof(private->rdc_data));
4965     info->confdata_size = min_t(unsigned long, private->conf.len,
4966                     sizeof(info->configuration_data));
4967     memcpy(info->configuration_data, private->conf.data,
4968            info->confdata_size);
4969     return 0;
4970 }
4971
4972 /*
4973  * SECTION: ioctl functions for eckd devices.
4974  */
4975
4976 /*
4977  * Release device ioctl.
4978  * Buils a channel programm to releases a prior reserved
4979  * (see dasd_eckd_reserve) device.
4980  */
4981 static int
4982 dasd_eckd_release(struct dasd_device *device)
4983 {
4984     struct dasd_ccw_req *cqr;
4985     int rc;
4986     struct ccw1 *ccw;
4987     int useglobal;
4988
4989     if (!capable(CAP_SYS_ADMIN))
4990         return -EACCES;
4991
4992     useglobal = 0;
4993     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4994     if (IS_ERR(cqr)) {
4995         mutex_lock(&dasd_reserve_mutex);
4996         useglobal = 1;
4997         cqr = &dasd_reserve_req->cqr;
4998         memset(cqr, 0, sizeof(*cqr));
4999         memset(&dasd_reserve_req->ccw, 0,
5000                sizeof(dasd_reserve_req->ccw));
5001         cqr->cpaddr = &dasd_reserve_req->ccw;
5002         cqr->data = &dasd_reserve_req->data;
5003         cqr->magic = DASD_ECKD_MAGIC;
5004     }
5005     ccw = cqr->cpaddr;
5006     ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
5007     ccw->flags |= CCW_FLAG_SLI;
5008     ccw->count = 32;
5009     ccw->cda = (__u32)(addr_t) cqr->data;
5010     cqr->startdev = device;
5011     cqr->memdev = device;
5012     clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5013     set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5014     cqr->retries = 2;   /* set retry counter to enable basic ERP */
5015     cqr->expires = 2 * HZ;
5016     cqr->buildclk = get_tod_clock();
5017     cqr->status = DASD_CQR_FILLED;
5018
5019     rc = dasd_sleep_on_immediatly(cqr);
5020     if (!rc)
5021         clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5022
5023     if (useglobal)
5024         mutex_unlock(&dasd_reserve_mutex);
5025     else
5026         dasd_sfree_request(cqr, cqr->memdev);
5027     return rc;
5028 }
5029
5030 /*
5031  * Reserve device ioctl.
5032  * Options are set to 'synchronous wait for interrupt' and
5033  * 'timeout the request'. This leads to a terminate IO if
5034  * the interrupt is outstanding for a certain time.
5035  */
5036 static int
5037 dasd_eckd_reserve(struct dasd_device *device)
5038 {
5039     struct dasd_ccw_req *cqr;
5040     int rc;
5041     struct ccw1 *ccw;
5042     int useglobal;
5043
5044     if (!capable(CAP_SYS_ADMIN))
5045         return -EACCES;
5046
5047     useglobal = 0;
5048     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5049     if (IS_ERR(cqr)) {
5050         mutex_lock(&dasd_reserve_mutex);
5051         useglobal = 1;
5052         cqr = &dasd_reserve_req->cqr;
5053         memset(cqr, 0, sizeof(*cqr));
5054         memset(&dasd_reserve_req->ccw, 0,
5055                sizeof(dasd_reserve_req->ccw));
5056         cqr->cpaddr = &dasd_reserve_req->ccw;
5057         cqr->data = &dasd_reserve_req->data;
5058         cqr->magic = DASD_ECKD_MAGIC;
5059     }
5060     ccw = cqr->cpaddr;
5061     ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
5062     ccw->flags |= CCW_FLAG_SLI;
5063     ccw->count = 32;
5064     ccw->cda = (__u32)(addr_t) cqr->data;
5065     cqr->startdev = device;
5066     cqr->memdev = device;
5067     clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5068     set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5069     cqr->retries = 2;   /* set retry counter to enable basic ERP */
5070     cqr->expires = 2 * HZ;
5071     cqr->buildclk = get_tod_clock();
5072     cqr->status = DASD_CQR_FILLED;
5073
5074     rc = dasd_sleep_on_immediatly(cqr);
5075     if (!rc)
5076         set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5077
5078     if (useglobal)
5079         mutex_unlock(&dasd_reserve_mutex);
5080     else
5081         dasd_sfree_request(cqr, cqr->memdev);
5082     return rc;
5083 }
5084
5085 /*
5086  * Steal lock ioctl - unconditional reserve device.
5087  * Buils a channel programm to break a device's reservation.
5088  * (unconditional reserve)
5089  */
5090 static int
5091 dasd_eckd_steal_lock(struct dasd_device *device)
5092 {
5093     struct dasd_ccw_req *cqr;
5094     int rc;
5095     struct ccw1 *ccw;
5096     int useglobal;
5097
5098     if (!capable(CAP_SYS_ADMIN))
5099         return -EACCES;
5100
5101     useglobal = 0;
5102     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5103     if (IS_ERR(cqr)) {
5104         mutex_lock(&dasd_reserve_mutex);
5105         useglobal = 1;
5106         cqr = &dasd_reserve_req->cqr;
5107         memset(cqr, 0, sizeof(*cqr));
5108         memset(&dasd_reserve_req->ccw, 0,
5109                sizeof(dasd_reserve_req->ccw));
5110         cqr->cpaddr = &dasd_reserve_req->ccw;
5111         cqr->data = &dasd_reserve_req->data;
5112         cqr->magic = DASD_ECKD_MAGIC;
5113     }
5114     ccw = cqr->cpaddr;
5115     ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5116     ccw->flags |= CCW_FLAG_SLI;
5117     ccw->count = 32;
5118     ccw->cda = (__u32)(addr_t) cqr->data;
5119     cqr->startdev = device;
5120     cqr->memdev = device;
5121     clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5122     set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5123     cqr->retries = 2;   /* set retry counter to enable basic ERP */
5124     cqr->expires = 2 * HZ;
5125     cqr->buildclk = get_tod_clock();
5126     cqr->status = DASD_CQR_FILLED;
5127
5128     rc = dasd_sleep_on_immediatly(cqr);
5129     if (!rc)
5130         set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5131
5132     if (useglobal)
5133         mutex_unlock(&dasd_reserve_mutex);
5134     else
5135         dasd_sfree_request(cqr, cqr->memdev);
5136     return rc;
5137 }
5138
5139 /*
5140  * SNID - Sense Path Group ID
5141  * This ioctl may be used in situations where I/O is stalled due to
5142  * a reserve, so if the normal dasd_smalloc_request fails, we use the
5143  * preallocated dasd_reserve_req.
5144  */
5145 static int dasd_eckd_snid(struct dasd_device *device,
5146               void __user *argp)
5147 {
5148     struct dasd_ccw_req *cqr;
5149     int rc;
5150     struct ccw1 *ccw;
5151     int useglobal;
5152     struct dasd_snid_ioctl_data usrparm;
5153
5154     if (!capable(CAP_SYS_ADMIN))
5155         return -EACCES;
5156
5157     if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5158         return -EFAULT;
5159
5160     useglobal = 0;
5161     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5162                    sizeof(struct dasd_snid_data), device,
5163                    NULL);
5164     if (IS_ERR(cqr)) {
5165         mutex_lock(&dasd_reserve_mutex);
5166         useglobal = 1;
5167         cqr = &dasd_reserve_req->cqr;
5168         memset(cqr, 0, sizeof(*cqr));
5169         memset(&dasd_reserve_req->ccw, 0,
5170                sizeof(dasd_reserve_req->ccw));
5171         cqr->cpaddr = &dasd_reserve_req->ccw;
5172         cqr->data = &dasd_reserve_req->data;
5173         cqr->magic = DASD_ECKD_MAGIC;
5174     }
5175     ccw = cqr->cpaddr;
5176     ccw->cmd_code = DASD_ECKD_CCW_SNID;
5177     ccw->flags |= CCW_FLAG_SLI;
5178     ccw->count = 12;
5179     ccw->cda = (__u32)(addr_t) cqr->data;
5180     cqr->startdev = device;
5181     cqr->memdev = device;
5182     clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5183     set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5184     set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5185     cqr->retries = 5;
5186     cqr->expires = 10 * HZ;
5187     cqr->buildclk = get_tod_clock();
5188     cqr->status = DASD_CQR_FILLED;
5189     cqr->lpm = usrparm.path_mask;
5190
5191     rc = dasd_sleep_on_immediatly(cqr);
5192     /* verify that I/O processing didn't modify the path mask */
5193     if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5194         rc = -EIO;
5195     if (!rc) {
5196         usrparm.data = *((struct dasd_snid_data *)cqr->data);
5197         if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5198             rc = -EFAULT;
5199     }
5200
5201     if (useglobal)
5202         mutex_unlock(&dasd_reserve_mutex);
5203     else
5204         dasd_sfree_request(cqr, cqr->memdev);
5205     return rc;
5206 }
5207
5208 /*
5209  * Read performance statistics
5210  */
5211 static int
5212 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5213 {
5214     struct dasd_psf_prssd_data *prssdp;
5215     struct dasd_rssd_perf_stats_t *stats;
5216     struct dasd_ccw_req *cqr;
5217     struct ccw1 *ccw;
5218     int rc;
5219
5220     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
5221                    (sizeof(struct dasd_psf_prssd_data) +
5222                     sizeof(struct dasd_rssd_perf_stats_t)),
5223                    device, NULL);
5224     if (IS_ERR(cqr)) {
5225         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5226                 "Could not allocate initialization request");
5227         return PTR_ERR(cqr);
5228     }
5229     cqr->startdev = device;
5230     cqr->memdev = device;
5231     cqr->retries = 0;
5232     clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5233     cqr->expires = 10 * HZ;
5234
5235     /* Prepare for Read Subsystem Data */
5236     prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5237     memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5238     prssdp->order = PSF_ORDER_PRSSD;
5239     prssdp->suborder = 0x01;    /* Performance Statistics */
5240     prssdp->varies[1] = 0x01;   /* Perf Statistics for the Subsystem */
5241
5242     ccw = cqr->cpaddr;
5243     ccw->cmd_code = DASD_ECKD_CCW_PSF;
5244     ccw->count = sizeof(struct dasd_psf_prssd_data);
5245     ccw->flags |= CCW_FLAG_CC;
5246     ccw->cda = (__u32)(addr_t) prssdp;
5247
5248     /* Read Subsystem Data - Performance Statistics */
5249     stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5250     memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5251
5252     ccw++;
5253     ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5254     ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5255     ccw->cda = (__u32)(addr_t) stats;
5256
5257     cqr->buildclk = get_tod_clock();
5258     cqr->status = DASD_CQR_FILLED;
5259     rc = dasd_sleep_on(cqr);
5260     if (rc == 0) {
5261         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5262         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5263         if (copy_to_user(argp, stats,
5264                  sizeof(struct dasd_rssd_perf_stats_t)))
5265             rc = -EFAULT;
5266     }
5267     dasd_sfree_request(cqr, cqr->memdev);
5268     return rc;
5269 }
5270
5271 /*
5272  * Get attributes (cache operations)
5273  * Returnes the cache attributes used in Define Extend (DE).
5274  */
5275 static int
5276 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5277 {
5278     struct dasd_eckd_private *private = device->private;
5279     struct attrib_data_t attrib = private->attrib;
5280     int rc;
5281
5282         if (!capable(CAP_SYS_ADMIN))
5283                 return -EACCES;
5284     if (!argp)
5285                 return -EINVAL;
5286
5287     rc = 0;
5288     if (copy_to_user(argp, (long *) &attrib,
5289              sizeof(struct attrib_data_t)))
5290         rc = -EFAULT;
5291
5292     return rc;
5293 }
5294
5295 /*
5296  * Set attributes (cache operations)
5297  * Stores the attributes for cache operation to be used in Define Extend (DE).
5298  */
5299 static int
5300 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5301 {
5302     struct dasd_eckd_private *private = device->private;
5303     struct attrib_data_t attrib;
5304
5305     if (!capable(CAP_SYS_ADMIN))
5306         return -EACCES;
5307     if (!argp)
5308         return -EINVAL;
5309
5310     if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5311         return -EFAULT;
5312     private->attrib = attrib;
5313
5314     dev_info(&device->cdev->dev,
5315          "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5316          private->attrib.operation, private->attrib.nr_cyl);
5317     return 0;
5318 }
5319
5320 /*
5321  * Issue syscall I/O to EMC Symmetrix array.
5322  * CCWs are PSF and RSSD
5323  */
5324 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5325 {
5326     struct dasd_symmio_parms usrparm;
5327     char *psf_data, *rssd_result;
5328     struct dasd_ccw_req *cqr;
5329     struct ccw1 *ccw;
5330     char psf0, psf1;
5331     int rc;
5332
5333     if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5334         return -EACCES;
5335     psf0 = psf1 = 0;
5336
5337     /* Copy parms from caller */
5338     rc = -EFAULT;
5339     if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5340         goto out;
5341     if (is_compat_task()) {
5342         /* Make sure pointers are sane even on 31 bit. */
5343         rc = -EINVAL;
5344         if ((usrparm.psf_data >> 32) != 0)
5345             goto out;
5346         if ((usrparm.rssd_result >> 32) != 0)
5347             goto out;
5348         usrparm.psf_data &= 0x7fffffffULL;
5349         usrparm.rssd_result &= 0x7fffffffULL;
5350     }
5351     /* at least 2 bytes are accessed and should be allocated */
5352     if (usrparm.psf_data_len < 2) {
5353         DBF_DEV_EVENT(DBF_WARNING, device,
5354                   "Symmetrix ioctl invalid data length %d",
5355                   usrparm.psf_data_len);
5356         rc = -EINVAL;
5357         goto out;
5358     }
5359     /* alloc I/O data area */
5360     psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5361     rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5362     if (!psf_data || !rssd_result) {
5363         rc = -ENOMEM;
5364         goto out_free;
5365     }
5366
5367     /* get syscall header from user space */
5368     rc = -EFAULT;
5369     if (copy_from_user(psf_data,
5370                (void __user *)(unsigned long) usrparm.psf_data,
5371                usrparm.psf_data_len))
5372         goto out_free;
5373     psf0 = psf_data[0];
5374     psf1 = psf_data[1];
5375
5376     /* setup CCWs for PSF + RSSD */
5377     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5378     if (IS_ERR(cqr)) {
5379         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5380             "Could not allocate initialization request");
5381         rc = PTR_ERR(cqr);
5382         goto out_free;
5383     }
5384
5385     cqr->startdev = device;
5386     cqr->memdev = device;
5387     cqr->retries = 3;
5388     cqr->expires = 10 * HZ;
5389     cqr->buildclk = get_tod_clock();
5390     cqr->status = DASD_CQR_FILLED;
5391
5392     /* Build the ccws */
5393     ccw = cqr->cpaddr;
5394
5395     /* PSF ccw */
5396     ccw->cmd_code = DASD_ECKD_CCW_PSF;
5397     ccw->count = usrparm.psf_data_len;
5398     ccw->flags |= CCW_FLAG_CC;
5399     ccw->cda = (__u32)(addr_t) psf_data;
5400
5401     ccw++;
5402
5403     /* RSSD ccw  */
5404     ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5405     ccw->count = usrparm.rssd_result_len;
5406     ccw->flags = CCW_FLAG_SLI ;
5407     ccw->cda = (__u32)(addr_t) rssd_result;
5408
5409     rc = dasd_sleep_on(cqr);
5410     if (rc)
5411         goto out_sfree;
5412
5413     rc = -EFAULT;
5414     if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5415                rssd_result, usrparm.rssd_result_len))
5416         goto out_sfree;
5417     rc = 0;
5418
5419 out_sfree:
5420     dasd_sfree_request(cqr, cqr->memdev);
5421 out_free:
5422     kfree(rssd_result);
5423     kfree(psf_data);
5424 out:
5425     DBF_DEV_EVENT(DBF_WARNING, device,
5426               "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5427               (int) psf0, (int) psf1, rc);
5428     return rc;
5429 }
5430
5431 static int
5432 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5433 {
5434     struct dasd_device *device = block->base;
5435
5436     switch (cmd) {
5437     case BIODASDGATTR:
5438         return dasd_eckd_get_attrib(device, argp);
5439     case BIODASDSATTR:
5440         return dasd_eckd_set_attrib(device, argp);
5441     case BIODASDPSRD:
5442         return dasd_eckd_performance(device, argp);
5443     case BIODASDRLSE:
5444         return dasd_eckd_release(device);
5445     case BIODASDRSRV:
5446         return dasd_eckd_reserve(device);
5447     case BIODASDSLCK:
5448         return dasd_eckd_steal_lock(device);
5449     case BIODASDSNID:
5450         return dasd_eckd_snid(device, argp);
5451     case BIODASDSYMMIO:
5452         return dasd_symm_io(device, argp);
5453     default:
5454         return -ENOTTY;
5455     }
5456 }
5457
5458 /*
5459  * Dump the range of CCWs into 'page' buffer
5460  * and return number of printed chars.
5461  */
5462 static int
5463 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5464 {
5465     int len, count;
5466     char *datap;
5467
5468     len = 0;
5469     while (from <= to) {
5470         len += sprintf(page + len, PRINTK_HEADER
5471                    " CCW %p: %08X %08X DAT:",
5472                    from, ((int *) from)[0], ((int *) from)[1]);
5473
5474         /* get pointer to data (consider IDALs) */
5475         if (from->flags & CCW_FLAG_IDA)
5476             datap = (char *) *((addr_t *) (addr_t) from->cda);
5477         else
5478             datap = (char *) ((addr_t) from->cda);
5479
5480         /* dump data (max 32 bytes) */
5481         for (count = 0; count < from->count && count < 32; count++) {
5482             if (count % 8 == 0) len += sprintf(page + len, " ");
5483             if (count % 4 == 0) len += sprintf(page + len, " ");
5484             len += sprintf(page + len, "%02x", datap[count]);
5485         }
5486         len += sprintf(page + len, "\n");
5487         from++;
5488     }
5489     return len;
5490 }
5491
5492 static void
5493 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5494              char *reason)
5495 {
5496     u64 *sense;
5497     u64 *stat;
5498
5499     sense = (u64 *) dasd_get_sense(irb);
5500     stat = (u64 *) &irb->scsw;
5501     if (sense) {
5502         DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5503                   "%016llx %016llx %016llx %016llx",
5504                   reason, *stat, *((u32 *) (stat + 1)),
5505                   sense[0], sense[1], sense[2], sense[3]);
5506     } else {
5507         DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5508                   reason, *stat, *((u32 *) (stat + 1)),
5509                   "NO VALID SENSE");
5510     }
5511 }
5512
5513 /*
5514  * Print sense data and related channel program.
5515  * Parts are printed because printk buffer is only 1024 bytes.
5516  */
5517 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5518                  struct dasd_ccw_req *req, struct irb *irb)
5519 {
5520     char *page;
5521     struct ccw1 *first, *last, *fail, *from, *to;
5522     int len, sl, sct;
5523
5524     page = (char *) get_zeroed_page(GFP_ATOMIC);
5525     if (page == NULL) {
5526         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5527                   "No memory to dump sense data\n");
5528         return;
5529     }
5530     /* dump the sense data */
5531     len = sprintf(page, PRINTK_HEADER
5532               " I/O status report for device %s:\n",
5533               dev_name(&device->cdev->dev));
5534     len += sprintf(page + len, PRINTK_HEADER
5535                " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5536                "CS:%02X RC:%d\n",
5537                req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5538                scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5539                scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5540                req ? req->intrc : 0);
5541     len += sprintf(page + len, PRINTK_HEADER
5542                " device %s: Failing CCW: %p\n",
5543                dev_name(&device->cdev->dev),
5544                (void *) (addr_t) irb->scsw.cmd.cpa);
5545     if (irb->esw.esw0.erw.cons) {
5546         for (sl = 0; sl < 4; sl++) {
5547             len += sprintf(page + len, PRINTK_HEADER
5548                        " Sense(hex) %2d-%2d:",
5549                        (8 * sl), ((8 * sl) + 7));
5550
5551             for (sct = 0; sct < 8; sct++) {
5552                 len += sprintf(page + len, " %02x",
5553                            irb->ecw[8 * sl + sct]);
5554             }
5555             len += sprintf(page + len, "\n");
5556         }
5557
5558         if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5559             /* 24 Byte Sense Data */
5560             sprintf(page + len, PRINTK_HEADER
5561                 " 24 Byte: %x MSG %x, "
5562                 "%s MSGb to SYSOP\n",
5563                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5564                 irb->ecw[1] & 0x10 ? "" : "no");
5565         } else {
5566             /* 32 Byte Sense Data */
5567             sprintf(page + len, PRINTK_HEADER
5568                 " 32 Byte: Format: %x "
5569                 "Exception class %x\n",
5570                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5571         }
5572     } else {
5573         sprintf(page + len, PRINTK_HEADER
5574             " SORRY - NO VALID SENSE AVAILABLE\n");
5575     }
5576     printk(KERN_ERR "%s", page);
5577
5578     if (req) {
5579         /* req == NULL for unsolicited interrupts */
5580         /* dump the Channel Program (max 140 Bytes per line) */
5581         /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
5582         first = req->cpaddr;
5583         for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5584         to = min(first + 6, last);
5585         len = sprintf(page, PRINTK_HEADER
5586                   " Related CP in req: %p\n", req);
5587         dasd_eckd_dump_ccw_range(first, to, page + len);
5588         printk(KERN_ERR "%s", page);
5589
5590         /* print failing CCW area (maximum 4) */
5591         /* scsw->cda is either valid or zero  */
5592         len = 0;
5593         from = ++to;
5594         fail = (struct ccw1 *)(addr_t)
5595                 irb->scsw.cmd.cpa; /* failing CCW */
5596         if (from <  fail - 2) {
5597             from = fail - 2;     /* there is a gap - print header */
5598             len += sprintf(page, PRINTK_HEADER "......\n");
5599         }
5600         to = min(fail + 1, last);
5601         len += dasd_eckd_dump_ccw_range(from, to, page + len);
5602
5603         /* print last CCWs (maximum 2) */
5604         from = max(from, ++to);
5605         if (from < last - 1) {
5606             from = last - 1;     /* there is a gap - print header */
5607             len += sprintf(page + len, PRINTK_HEADER "......\n");
5608         }
5609         len += dasd_eckd_dump_ccw_range(from, last, page + len);
5610         if (len > 0)
5611             printk(KERN_ERR "%s", page);
5612     }
5613     free_page((unsigned long) page);
5614 }
5615
5616
5617 /*
5618  * Print sense data from a tcw.
5619  */
5620 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5621                  struct dasd_ccw_req *req, struct irb *irb)
5622 {
5623     char *page;
5624     int len, sl, sct, residual;
5625     struct tsb *tsb;
5626     u8 *sense, *rcq;
5627
5628     page = (char *) get_zeroed_page(GFP_ATOMIC);
5629     if (page == NULL) {
5630         DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5631                 "No memory to dump sense data");
5632         return;
5633     }
5634     /* dump the sense data */
5635     len = sprintf(page, PRINTK_HEADER
5636               " I/O status report for device %s:\n",
5637               dev_name(&device->cdev->dev));
5638     len += sprintf(page + len, PRINTK_HEADER
5639                " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5640                "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5641                req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5642                scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5643                scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5644                irb->scsw.tm.fcxs,
5645                (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5646                req ? req->intrc : 0);
5647     len += sprintf(page + len, PRINTK_HEADER
5648                " device %s: Failing TCW: %p\n",
5649                dev_name(&device->cdev->dev),
5650                (void *) (addr_t) irb->scsw.tm.tcw);
5651
5652     tsb = NULL;
5653     sense = NULL;
5654     if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5655         tsb = tcw_get_tsb(
5656             (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
5657
5658     if (tsb) {
5659         len += sprintf(page + len, PRINTK_HEADER
5660                    " tsb->length %d\n", tsb->length);
5661         len += sprintf(page + len, PRINTK_HEADER
5662                    " tsb->flags %x\n", tsb->flags);
5663         len += sprintf(page + len, PRINTK_HEADER
5664                    " tsb->dcw_offset %d\n", tsb->dcw_offset);
5665         len += sprintf(page + len, PRINTK_HEADER
5666                    " tsb->count %d\n", tsb->count);
5667         residual = tsb->count - 28;
5668         len += sprintf(page + len, PRINTK_HEADER
5669                    " residual %d\n", residual);
5670
5671         switch (tsb->flags & 0x07) {
5672         case 1: /* tsa_iostat */
5673             len += sprintf(page + len, PRINTK_HEADER
5674                    " tsb->tsa.iostat.dev_time %d\n",
5675                        tsb->tsa.iostat.dev_time);
5676             len += sprintf(page + len, PRINTK_HEADER
5677                    " tsb->tsa.iostat.def_time %d\n",
5678                        tsb->tsa.iostat.def_time);
5679             len += sprintf(page + len, PRINTK_HEADER
5680                    " tsb->tsa.iostat.queue_time %d\n",
5681                        tsb->tsa.iostat.queue_time);
5682             len += sprintf(page + len, PRINTK_HEADER
5683                    " tsb->tsa.iostat.dev_busy_time %d\n",
5684                        tsb->tsa.iostat.dev_busy_time);
5685             len += sprintf(page + len, PRINTK_HEADER
5686                    " tsb->tsa.iostat.dev_act_time %d\n",
5687                        tsb->tsa.iostat.dev_act_time);
5688             sense = tsb->tsa.iostat.sense;
5689             break;
5690         case 2: /* ts_ddpc */
5691             len += sprintf(page + len, PRINTK_HEADER
5692                    " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5693             for (sl = 0; sl < 2; sl++) {
5694                 len += sprintf(page + len, PRINTK_HEADER
5695                            " tsb->tsa.ddpc.rcq %2d-%2d: ",
5696                            (8 * sl), ((8 * sl) + 7));
5697                 rcq = tsb->tsa.ddpc.rcq;
5698                 for (sct = 0; sct < 8; sct++) {
5699                     len += sprintf(page + len, " %02x",
5700                                rcq[8 * sl + sct]);
5701                 }
5702                 len += sprintf(page + len, "\n");
5703             }
5704             sense = tsb->tsa.ddpc.sense;
5705             break;
5706         case 3: /* tsa_intrg */
5707             len += sprintf(page + len, PRINTK_HEADER
5708                       " tsb->tsa.intrg.: not supported yet\n");
5709             break;
5710         }
5711
5712         if (sense) {
5713             for (sl = 0; sl < 4; sl++) {
5714                 len += sprintf(page + len, PRINTK_HEADER
5715                            " Sense(hex) %2d-%2d:",
5716                            (8 * sl), ((8 * sl) + 7));
5717                 for (sct = 0; sct < 8; sct++) {
5718                     len += sprintf(page + len, " %02x",
5719                                sense[8 * sl + sct]);
5720                 }
5721                 len += sprintf(page + len, "\n");
5722             }
5723
5724             if (sense[27] & DASD_SENSE_BIT_0) {
5725                 /* 24 Byte Sense Data */
5726                 sprintf(page + len, PRINTK_HEADER
5727                     " 24 Byte: %x MSG %x, "
5728                     "%s MSGb to SYSOP\n",
5729                     sense[7] >> 4, sense[7] & 0x0f,
5730                     sense[1] & 0x10 ? "" : "no");
5731             } else {
5732                 /* 32 Byte Sense Data */
5733                 sprintf(page + len, PRINTK_HEADER
5734                     " 32 Byte: Format: %x "
5735                     "Exception class %x\n",
5736                     sense[6] & 0x0f, sense[22] >> 4);
5737             }
5738         } else {
5739             sprintf(page + len, PRINTK_HEADER
5740                 " SORRY - NO VALID SENSE AVAILABLE\n");
5741         }
5742     } else {
5743         sprintf(page + len, PRINTK_HEADER
5744             " SORRY - NO TSB DATA AVAILABLE\n");
5745     }
5746     printk(KERN_ERR "%s", page);
5747     free_page((unsigned long) page);
5748 }
5749
5750 static void dasd_eckd_dump_sense(struct dasd_device *device,
5751                  struct dasd_ccw_req *req, struct irb *irb)
5752 {
5753     u8 *sense = dasd_get_sense(irb);
5754
5755     if (scsw_is_tm(&irb->scsw)) {
5756         /*
5757          * In some cases the 'File Protected' or 'Incorrect Length'
5758          * error might be expected and log messages shouldn't be written
5759          * then. Check if the according suppress bit is set.
5760          */
5761         if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
5762             test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
5763             return;
5764         if (scsw_cstat(&irb->scsw) == 0x40 &&
5765             test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5766             return;
5767
5768         dasd_eckd_dump_sense_tcw(device, req, irb);
5769     } else {
5770         /*
5771          * In some cases the 'Command Reject' or 'No Record Found'
5772          * error might be expected and log messages shouldn't be
5773          * written then. Check if the according suppress bit is set.
5774          */
5775         if (sense && sense[0] & SNS0_CMD_REJECT &&
5776             test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5777             return;
5778
5779         if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5780             test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5781             return;
5782
5783         dasd_eckd_dump_sense_ccw(device, req, irb);
5784     }
5785 }
5786
5787 static int dasd_eckd_reload_device(struct dasd_device *device)
5788 {
5789     struct dasd_eckd_private *private = device->private;
5790     int rc, old_base;
5791     char print_uid[60];
5792     struct dasd_uid uid;
5793     unsigned long flags;
5794
5795     /*
5796      * remove device from alias handling to prevent new requests
5797      * from being scheduled on the wrong alias device
5798      */
5799     dasd_alias_remove_device(device);
5800
5801     spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5802     old_base = private->uid.base_unit_addr;
5803     spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5804
5805     /* Read Configuration Data */
5806     rc = dasd_eckd_read_conf(device);
5807     if (rc)
5808         goto out_err;
5809
5810     dasd_eckd_read_fc_security(device);
5811
5812     rc = dasd_eckd_generate_uid(device);
5813     if (rc)
5814         goto out_err;
5815     /*
5816      * update unit address configuration and
5817      * add device to alias management
5818      */
5819     dasd_alias_update_add_device(device);
5820
5821     dasd_eckd_get_uid(device, &uid);
5822
5823     if (old_base != uid.base_unit_addr) {
5824         dasd_eckd_get_uid_string(&private->conf, print_uid);
5825         dev_info(&device->cdev->dev,
5826              "An Alias device was reassigned to a new base device "
5827              "with UID: %s\n", print_uid);
5828     }
5829     return 0;
5830
5831 out_err:
5832     return -1;
5833 }
5834
5835 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5836                      struct dasd_rssd_messages *messages,
5837                      __u8 lpum)
5838 {
5839     struct dasd_rssd_messages *message_buf;
5840     struct dasd_psf_prssd_data *prssdp;
5841     struct dasd_ccw_req *cqr;
5842     struct ccw1 *ccw;
5843     int rc;
5844
5845     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5846                    (sizeof(struct dasd_psf_prssd_data) +
5847                     sizeof(struct dasd_rssd_messages)),
5848                    device, NULL);
5849     if (IS_ERR(cqr)) {
5850         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5851                 "Could not allocate read message buffer request");
5852         return PTR_ERR(cqr);
5853     }
5854
5855     cqr->lpm = lpum;
5856 retry:
5857     cqr->startdev = device;
5858     cqr->memdev = device;
5859     cqr->block = NULL;
5860     cqr->expires = 10 * HZ;
5861     set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5862     /* dasd_sleep_on_immediatly does not do complex error
5863      * recovery so clear erp flag and set retry counter to
5864      * do basic erp */
5865     clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5866     cqr->retries = 256;
5867
5868     /* Prepare for Read Subsystem Data */
5869     prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5870     memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5871     prssdp->order = PSF_ORDER_PRSSD;
5872     prssdp->suborder = 0x03;    /* Message Buffer */
5873     /* all other bytes of prssdp must be zero */
5874
5875     ccw = cqr->cpaddr;
5876     ccw->cmd_code = DASD_ECKD_CCW_PSF;
5877     ccw->count = sizeof(struct dasd_psf_prssd_data);
5878     ccw->flags |= CCW_FLAG_CC;
5879     ccw->flags |= CCW_FLAG_SLI;
5880     ccw->cda = (__u32)(addr_t) prssdp;
5881
5882     /* Read Subsystem Data - message buffer */
5883     message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5884     memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5885
5886     ccw++;
5887     ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5888     ccw->count = sizeof(struct dasd_rssd_messages);
5889     ccw->flags |= CCW_FLAG_SLI;
5890     ccw->cda = (__u32)(addr_t) message_buf;
5891
5892     cqr->buildclk = get_tod_clock();
5893     cqr->status = DASD_CQR_FILLED;
5894     rc = dasd_sleep_on_immediatly(cqr);
5895     if (rc == 0) {
5896         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5897         message_buf = (struct dasd_rssd_messages *)
5898             (prssdp + 1);
5899         memcpy(messages, message_buf,
5900                sizeof(struct dasd_rssd_messages));
5901     } else if (cqr->lpm) {
5902         /*
5903          * on z/VM we might not be able to do I/O on the requested path
5904          * but instead we get the required information on any path
5905          * so retry with open path mask
5906          */
5907         cqr->lpm = 0;
5908         goto retry;
5909     } else
5910         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5911                 "Reading messages failed with rc=%d\n"
5912                 , rc);
5913     dasd_sfree_request(cqr, cqr->memdev);
5914     return rc;
5915 }
5916
5917 static int dasd_eckd_query_host_access(struct dasd_device *device,
5918                        struct dasd_psf_query_host_access *data)
5919 {
5920     struct dasd_eckd_private *private = device->private;
5921     struct dasd_psf_query_host_access *host_access;
5922     struct dasd_psf_prssd_data *prssdp;
5923     struct dasd_ccw_req *cqr;
5924     struct ccw1 *ccw;
5925     int rc;
5926
5927     /* not available for HYPER PAV alias devices */
5928     if (!device->block && private->lcu->pav == HYPER_PAV)
5929         return -EOPNOTSUPP;
5930
5931     /* may not be supported by the storage server */
5932     if (!(private->features.feature[14] & 0x80))
5933         return -EOPNOTSUPP;
5934
5935     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5936                    sizeof(struct dasd_psf_prssd_data) + 1,
5937                    device, NULL);
5938     if (IS_ERR(cqr)) {
5939         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5940                 "Could not allocate read message buffer request");
5941         return PTR_ERR(cqr);
5942     }
5943     host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5944     if (!host_access) {
5945         dasd_sfree_request(cqr, device);
5946         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5947                 "Could not allocate host_access buffer");
5948         return -ENOMEM;
5949     }
5950     cqr->startdev = device;
5951     cqr->memdev = device;
5952     cqr->block = NULL;
5953     cqr->retries = 256;
5954     cqr->expires = 10 * HZ;
5955
5956     /* Prepare for Read Subsystem Data */
5957     prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5958     memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5959     prssdp->order = PSF_ORDER_PRSSD;
5960     prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5961     /* LSS and Volume that will be queried */
5962     prssdp->lss = private->conf.ned->ID;
5963     prssdp->volume = private->conf.ned->unit_addr;
5964     /* all other bytes of prssdp must be zero */
5965
5966     ccw = cqr->cpaddr;
5967     ccw->cmd_code = DASD_ECKD_CCW_PSF;
5968     ccw->count = sizeof(struct dasd_psf_prssd_data);
5969     ccw->flags |= CCW_FLAG_CC;
5970     ccw->flags |= CCW_FLAG_SLI;
5971     ccw->cda = (__u32)(addr_t) prssdp;
5972
5973     /* Read Subsystem Data - query host access */
5974     ccw++;
5975     ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5976     ccw->count = sizeof(struct dasd_psf_query_host_access);
5977     ccw->flags |= CCW_FLAG_SLI;
5978     ccw->cda = (__u32)(addr_t) host_access;
5979
5980     cqr->buildclk = get_tod_clock();
5981     cqr->status = DASD_CQR_FILLED;
5982     /* the command might not be supported, suppress error message */
5983     __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5984     rc = dasd_sleep_on_interruptible(cqr);
5985     if (rc == 0) {
5986         *data = *host_access;
5987     } else {
5988         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5989                 "Reading host access data failed with rc=%d\n",
5990                 rc);
5991         rc = -EOPNOTSUPP;
5992     }
5993
5994     dasd_sfree_request(cqr, cqr->memdev);
5995     kfree(host_access);
5996     return rc;
5997 }
5998 /*
5999  * return number of grouped devices
6000  */
6001 static int dasd_eckd_host_access_count(struct dasd_device *device)
6002 {
6003     struct dasd_psf_query_host_access *access;
6004     struct dasd_ckd_path_group_entry *entry;
6005     struct dasd_ckd_host_information *info;
6006     int count = 0;
6007     int rc, i;
6008
6009     access = kzalloc(sizeof(*access), GFP_NOIO);
6010     if (!access) {
6011         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6012                 "Could not allocate access buffer");
6013         return -ENOMEM;
6014     }
6015     rc = dasd_eckd_query_host_access(device, access);
6016     if (rc) {
6017         kfree(access);
6018         return rc;
6019     }
6020
6021     info = (struct dasd_ckd_host_information *)
6022         access->host_access_information;
6023     for (i = 0; i < info->entry_count; i++) {
6024         entry = (struct dasd_ckd_path_group_entry *)
6025             (info->entry + i * info->entry_size);
6026         if (entry->status_flags & DASD_ECKD_PG_GROUPED)
6027             count++;
6028     }
6029
6030     kfree(access);
6031     return count;
6032 }
6033
6034 /*
6035  * write host access information to a sequential file
6036  */
6037 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
6038 {
6039     struct dasd_psf_query_host_access *access;
6040     struct dasd_ckd_path_group_entry *entry;
6041     struct dasd_ckd_host_information *info;
6042     char sysplex[9] = "";
6043     int rc, i;
6044
6045     access = kzalloc(sizeof(*access), GFP_NOIO);
6046     if (!access) {
6047         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6048                 "Could not allocate access buffer");
6049         return -ENOMEM;
6050     }
6051     rc = dasd_eckd_query_host_access(device, access);
6052     if (rc) {
6053         kfree(access);
6054         return rc;
6055     }
6056
6057     info = (struct dasd_ckd_host_information *)
6058         access->host_access_information;
6059     for (i = 0; i < info->entry_count; i++) {
6060         entry = (struct dasd_ckd_path_group_entry *)
6061             (info->entry + i * info->entry_size);
6062         /* PGID */
6063         seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6064         /* FLAGS */
6065         seq_printf(m, "status_flags %02x\n", entry->status_flags);
6066         /* SYSPLEX NAME */
6067         memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6068         EBCASC(sysplex, sizeof(sysplex));
6069         seq_printf(m, "sysplex_name %8s\n", sysplex);
6070         /* SUPPORTED CYLINDER */
6071         seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6072         /* TIMESTAMP */
6073         seq_printf(m, "timestamp %lu\n", (unsigned long)
6074                entry->timestamp);
6075     }
6076     kfree(access);
6077
6078     return 0;
6079 }
6080
6081 /*
6082  * Perform Subsystem Function - CUIR response
6083  */
6084 static int
6085 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6086                 __u32 message_id, __u8 lpum)
6087 {
6088     struct dasd_psf_cuir_response *psf_cuir;
6089     int pos = pathmask_to_pos(lpum);
6090     struct dasd_ccw_req *cqr;
6091     struct ccw1 *ccw;
6092     int rc;
6093
6094     cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6095                    sizeof(struct dasd_psf_cuir_response),
6096                    device, NULL);
6097
6098     if (IS_ERR(cqr)) {
6099         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6100                "Could not allocate PSF-CUIR request");
6101         return PTR_ERR(cqr);
6102     }
6103
6104     psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6105     psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6106     psf_cuir->cc = response;
6107     psf_cuir->chpid = device->path[pos].chpid;
6108     psf_cuir->message_id = message_id;
6109     psf_cuir->cssid = device->path[pos].cssid;
6110     psf_cuir->ssid = device->path[pos].ssid;
6111     ccw = cqr->cpaddr;
6112     ccw->cmd_code = DASD_ECKD_CCW_PSF;
6113     ccw->cda = (__u32)(addr_t)psf_cuir;
6114     ccw->flags = CCW_FLAG_SLI;
6115     ccw->count = sizeof(struct dasd_psf_cuir_response);
6116
6117     cqr->startdev = device;
6118     cqr->memdev = device;
6119     cqr->block = NULL;
6120     cqr->retries = 256;
6121     cqr->expires = 10*HZ;
6122     cqr->buildclk = get_tod_clock();
6123     cqr->status = DASD_CQR_FILLED;
6124     set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6125
6126     rc = dasd_sleep_on(cqr);
6127
6128     dasd_sfree_request(cqr, cqr->memdev);
6129     return rc;
6130 }
6131
6132 /*
6133  * return configuration data that is referenced by record selector
6134  * if a record selector is specified or per default return the
6135  * conf_data pointer for the path specified by lpum
6136  */
6137 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6138                              __u8 lpum,
6139                              struct dasd_cuir_message *cuir)
6140 {
6141     struct dasd_conf_data *conf_data;
6142     int path, pos;
6143
6144     if (cuir->record_selector == 0)
6145         goto out;
6146     for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6147         conf_data = device->path[pos].conf_data;
6148         if (conf_data->gneq.record_selector ==
6149             cuir->record_selector)
6150             return conf_data;
6151     }
6152 out:
6153     return device->path[pathmask_to_pos(lpum)].conf_data;
6154 }
6155
6156 /*
6157  * This function determines the scope of a reconfiguration request by
6158  * analysing the path and device selection data provided in the CUIR request.
6159  * Returns a path mask containing CUIR affected paths for the give device.
6160  *
6161  * If the CUIR request does not contain the required information return the
6162  * path mask of the path the attention message for the CUIR request was reveived
6163  * on.
6164  */
6165 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6166                 struct dasd_cuir_message *cuir)
6167 {
6168     struct dasd_conf_data *ref_conf_data;
6169     unsigned long bitmask = 0, mask = 0;
6170     struct dasd_conf_data *conf_data;
6171     unsigned int pos, path;
6172     char *ref_gneq, *gneq;
6173     char *ref_ned, *ned;
6174     int tbcpm = 0;
6175
6176     /* if CUIR request does not specify the scope use the path
6177        the attention message was presented on */
6178     if (!cuir->ned_map ||
6179         !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6180         return lpum;
6181
6182     /* get reference conf data */
6183     ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6184     /* reference ned is determined by ned_map field */
6185     pos = 8 - ffs(cuir->ned_map);
6186     ref_ned = (char *)&ref_conf_data->neds[pos];
6187     ref_gneq = (char *)&ref_conf_data->gneq;
6188     /* transfer 24 bit neq_map to mask */
6189     mask = cuir->neq_map[2];
6190     mask |= cuir->neq_map[1] << 8;
6191     mask |= cuir->neq_map[0] << 16;
6192
6193     for (path = 0; path < 8; path++) {
6194         /* initialise data per path */
6195         bitmask = mask;
6196         conf_data = device->path[path].conf_data;
6197         pos = 8 - ffs(cuir->ned_map);
6198         ned = (char *) &conf_data->neds[pos];
6199         /* compare reference ned and per path ned */
6200         if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6201             continue;
6202         gneq = (char *)&conf_data->gneq;
6203         /* compare reference gneq and per_path gneq under
6204            24 bit mask where mask bit 0 equals byte 7 of
6205            the gneq and mask bit 24 equals byte 31 */
6206         while (bitmask) {
6207             pos = ffs(bitmask) - 1;
6208             if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6209                 != 0)
6210                 break;
6211             clear_bit(pos, &bitmask);
6212         }
6213         if (bitmask)
6214             continue;
6215         /* device and path match the reference values
6216            add path to CUIR scope */
6217         tbcpm |= 0x80 >> path;
6218     }
6219     return tbcpm;
6220 }
6221
6222 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6223                        unsigned long paths, int action)
6224 {
6225     int pos;
6226
6227     while (paths) {
6228         /* get position of bit in mask */
6229         pos = 8 - ffs(paths);
6230         /* get channel path descriptor from this position */
6231         if (action == CUIR_QUIESCE)
6232             pr_warn("Service on the storage server caused path %x.%02x to go offline",
6233                 device->path[pos].cssid,
6234                 device->path[pos].chpid);
6235         else if (action == CUIR_RESUME)
6236             pr_info("Path %x.%02x is back online after service on the storage server",
6237                 device->path[pos].cssid,
6238                 device->path[pos].chpid);
6239         clear_bit(7 - pos, &paths);
6240     }
6241 }
6242
6243 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6244                       struct dasd_cuir_message *cuir)
6245 {
6246     unsigned long tbcpm;
6247
6248     tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6249     /* nothing to do if path is not in use */
6250     if (!(dasd_path_get_opm(device) & tbcpm))
6251         return 0;
6252     if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6253         /* no path would be left if the CUIR action is taken
6254            return error */
6255         return -EINVAL;
6256     }
6257     /* remove device from operational path mask */
6258     dasd_path_remove_opm(device, tbcpm);
6259     dasd_path_add_cuirpm(device, tbcpm);
6260     return tbcpm;
6261 }
6262
6263 /*
6264  * walk through all devices and build a path mask to quiesce them
6265  * return an error if the last path to a device would be removed
6266  *
6267  * if only part of the devices are quiesced and an error
6268  * occurs no onlining necessary, the storage server will
6269  * notify the already set offline devices again
6270  */
6271 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6272                   struct dasd_cuir_message *cuir)
6273 {
6274     struct dasd_eckd_private *private = device->private;
6275     struct alias_pav_group *pavgroup, *tempgroup;
6276     struct dasd_device *dev, *n;
6277     unsigned long paths = 0;
6278     unsigned long flags;
6279     int tbcpm;
6280
6281     /* active devices */
6282     list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6283                  alias_list) {
6284         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6285         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6286         spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6287         if (tbcpm < 0)
6288             goto out_err;
6289         paths |= tbcpm;
6290     }
6291     /* inactive devices */
6292     list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6293                  alias_list) {
6294         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6295         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6296         spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6297         if (tbcpm < 0)
6298             goto out_err;
6299         paths |= tbcpm;
6300     }
6301     /* devices in PAV groups */
6302     list_for_each_entry_safe(pavgroup, tempgroup,
6303                  &private->lcu->grouplist, group) {
6304         list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6305                      alias_list) {
6306             spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6307             tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6308             spin_unlock_irqrestore(
6309                 get_ccwdev_lock(dev->cdev), flags);
6310             if (tbcpm < 0)
6311                 goto out_err;
6312             paths |= tbcpm;
6313         }
6314         list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6315                      alias_list) {
6316             spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6317             tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6318             spin_unlock_irqrestore(
6319                 get_ccwdev_lock(dev->cdev), flags);
6320             if (tbcpm < 0)
6321                 goto out_err;
6322             paths |= tbcpm;
6323         }
6324     }
6325     /* notify user about all paths affected by CUIR action */
6326     dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6327     return 0;
6328 out_err:
6329     return tbcpm;
6330 }
6331
6332 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6333                  struct dasd_cuir_message *cuir)
6334 {
6335     struct dasd_eckd_private *private = device->private;
6336     struct alias_pav_group *pavgroup, *tempgroup;
6337     struct dasd_device *dev, *n;
6338     unsigned long paths = 0;
6339     int tbcpm;
6340
6341     /*
6342      * the path may have been added through a generic path event before
6343      * only trigger path verification if the path is not already in use
6344      */
6345     list_for_each_entry_safe(dev, n,
6346                  &private->lcu->active_devices,
6347                  alias_list) {
6348         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6349         paths |= tbcpm;
6350         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6351             dasd_path_add_tbvpm(dev, tbcpm);
6352             dasd_schedule_device_bh(dev);
6353         }
6354     }
6355     list_for_each_entry_safe(dev, n,
6356                  &private->lcu->inactive_devices,
6357                  alias_list) {
6358         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6359         paths |= tbcpm;
6360         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6361             dasd_path_add_tbvpm(dev, tbcpm);
6362             dasd_schedule_device_bh(dev);
6363         }
6364     }
6365     /* devices in PAV groups */
6366     list_for_each_entry_safe(pavgroup, tempgroup,
6367                  &private->lcu->grouplist,
6368                  group) {
6369         list_for_each_entry_safe(dev, n,
6370                      &pavgroup->baselist,
6371                      alias_list) {
6372             tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6373             paths |= tbcpm;
6374             if (!(dasd_path_get_opm(dev) & tbcpm)) {
6375                 dasd_path_add_tbvpm(dev, tbcpm);
6376                 dasd_schedule_device_bh(dev);
6377             }
6378         }
6379         list_for_each_entry_safe(dev, n,
6380                      &pavgroup->aliaslist,
6381                      alias_list) {
6382             tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6383             paths |= tbcpm;
6384             if (!(dasd_path_get_opm(dev) & tbcpm)) {
6385                 dasd_path_add_tbvpm(dev, tbcpm);
6386                 dasd_schedule_device_bh(dev);
6387             }
6388         }
6389     }
6390     /* notify user about all paths affected by CUIR action */
6391     dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6392     return 0;
6393 }
6394
6395 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6396                  __u8 lpum)
6397 {
6398     struct dasd_cuir_message *cuir = messages;
6399     int response;
6400
6401     DBF_DEV_EVENT(DBF_WARNING, device,
6402               "CUIR request: %016llx %016llx %016llx %08x",
6403               ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6404               ((u32 *)cuir)[3]);
6405
6406     if (cuir->code == CUIR_QUIESCE) {
6407         /* quiesce */
6408         if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6409             response = PSF_CUIR_LAST_PATH;
6410         else
6411             response = PSF_CUIR_COMPLETED;
6412     } else if (cuir->code == CUIR_RESUME) {
6413         /* resume */
6414         dasd_eckd_cuir_resume(device, lpum, cuir);
6415         response = PSF_CUIR_COMPLETED;
6416     } else
6417         response = PSF_CUIR_NOT_SUPPORTED;
6418
6419     dasd_eckd_psf_cuir_response(device, response,
6420                     cuir->message_id, lpum);
6421     DBF_DEV_EVENT(DBF_WARNING, device,
6422               "CUIR response: %d on message ID %08x", response,
6423               cuir->message_id);
6424     /* to make sure there is no attention left schedule work again */
6425     device->discipline->check_attention(device, lpum);
6426 }
6427
6428 static void dasd_eckd_oos_resume(struct dasd_device *device)
6429 {
6430     struct dasd_eckd_private *private = device->private;
6431     struct alias_pav_group *pavgroup, *tempgroup;
6432     struct dasd_device *dev, *n;
6433     unsigned long flags;
6434
6435     spin_lock_irqsave(&private->lcu->lock, flags);
6436     list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6437                  alias_list) {
6438         if (dev->stopped & DASD_STOPPED_NOSPC)
6439             dasd_generic_space_avail(dev);
6440     }
6441     list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6442                  alias_list) {
6443         if (dev->stopped & DASD_STOPPED_NOSPC)
6444             dasd_generic_space_avail(dev);
6445     }
6446     /* devices in PAV groups */
6447     list_for_each_entry_safe(pavgroup, tempgroup,
6448                  &private->lcu->grouplist,
6449                  group) {
6450         list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6451                      alias_list) {
6452             if (dev->stopped & DASD_STOPPED_NOSPC)
6453                 dasd_generic_space_avail(dev);
6454         }
6455         list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6456                      alias_list) {
6457             if (dev->stopped & DASD_STOPPED_NOSPC)
6458                 dasd_generic_space_avail(dev);
6459         }
6460     }
6461     spin_unlock_irqrestore(&private->lcu->lock, flags);
6462 }
6463
6464 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6465                  __u8 lpum)
6466 {
6467     struct dasd_oos_message *oos = messages;
6468
6469     switch (oos->code) {
6470     case REPO_WARN:
6471     case POOL_WARN:
6472         dev_warn(&device->cdev->dev,
6473              "Extent pool usage has reached a critical value\n");
6474         dasd_eckd_oos_resume(device);
6475         break;
6476     case REPO_EXHAUST:
6477     case POOL_EXHAUST:
6478         dev_warn(&device->cdev->dev,
6479              "Extent pool is exhausted\n");
6480         break;
6481     case REPO_RELIEVE:
6482     case POOL_RELIEVE:
6483         dev_info(&device->cdev->dev,
6484              "Extent pool physical space constraint has been relieved\n");
6485         break;
6486     }
6487
6488     /* In any case, update related data */
6489     dasd_eckd_read_ext_pool_info(device);
6490
6491     /* to make sure there is no attention left schedule work again */
6492     device->discipline->check_attention(device, lpum);
6493 }
6494
6495 static void dasd_eckd_check_attention_work(struct work_struct *work)
6496 {
6497     struct check_attention_work_data *data;
6498     struct dasd_rssd_messages *messages;
6499     struct dasd_device *device;
6500     int rc;
6501
6502     data = container_of(work, struct check_attention_work_data, worker);
6503     device = data->device;
6504     messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6505     if (!messages) {
6506         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6507                   "Could not allocate attention message buffer");
6508         goto out;
6509     }
6510     rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6511     if (rc)
6512         goto out;
6513
6514     if (messages->length == ATTENTION_LENGTH_CUIR &&
6515         messages->format == ATTENTION_FORMAT_CUIR)
6516         dasd_eckd_handle_cuir(device, messages, data->lpum);
6517     if (messages->length == ATTENTION_LENGTH_OOS &&
6518         messages->format == ATTENTION_FORMAT_OOS)
6519         dasd_eckd_handle_oos(device, messages, data->lpum);
6520
6521 out:
6522     dasd_put_device(device);
6523     kfree(messages);
6524     kfree(data);
6525 }
6526
6527 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6528 {
6529     struct check_attention_work_data *data;
6530
6531     data = kzalloc(sizeof(*data), GFP_ATOMIC);
6532     if (!data)
6533         return -ENOMEM;
6534     INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6535     dasd_get_device(device);
6536     data->device = device;
6537     data->lpum = lpum;
6538     schedule_work(&data->worker);
6539     return 0;
6540 }
6541
6542 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6543 {
6544     if (~lpum & dasd_path_get_opm(device)) {
6545         dasd_path_add_nohpfpm(device, lpum);
6546         dasd_path_remove_opm(device, lpum);
6547         dev_err(&device->cdev->dev,
6548             "Channel path %02X lost HPF functionality and is disabled\n",
6549             lpum);
6550         return 1;
6551     }
6552     return 0;
6553 }
6554
6555 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6556 {
6557     struct dasd_eckd_private *private = device->private;
6558
6559     dev_err(&device->cdev->dev,
6560         "High Performance FICON disabled\n");
6561     private->fcx_max_data = 0;
6562 }
6563
6564 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6565 {
6566     struct dasd_eckd_private *private = device->private;
6567
6568     return private->fcx_max_data ? 1 : 0;
6569 }
6570
6571 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6572                        struct irb *irb)
6573 {
6574     struct dasd_eckd_private *private = device->private;
6575
6576     if (!private->fcx_max_data) {
6577         /* sanity check for no HPF, the error makes no sense */
6578         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6579                   "Trying to disable HPF for a non HPF device");
6580         return;
6581     }
6582     if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6583         dasd_eckd_disable_hpf_device(device);
6584     } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6585         if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6586             return;
6587         dasd_eckd_disable_hpf_device(device);
6588         dasd_path_set_tbvpm(device,
6589                   dasd_path_get_hpfpm(device));
6590     }
6591     /*
6592      * prevent that any new I/O ist started on the device and schedule a
6593      * requeue of existing requests
6594      */
6595     dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6596     dasd_schedule_requeue(device);
6597 }
6598
6599 /*
6600  * Initialize block layer request queue.
6601  */
6602 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6603 {
6604     unsigned int logical_block_size = block->bp_block;
6605     struct request_queue *q = block->request_queue;
6606     struct dasd_device *device = block->base;
6607     int max;
6608
6609     if (device->features & DASD_FEATURE_USERAW) {
6610         /*
6611          * the max_blocks value for raw_track access is 256
6612          * it is higher than the native ECKD value because we
6613          * only need one ccw per track
6614          * so the max_hw_sectors are
6615          * 2048 x 512B = 1024kB = 16 tracks
6616          */
6617         max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6618     } else {
6619         max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6620     }
6621     blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6622     q->limits.max_dev_sectors = max;
6623     blk_queue_logical_block_size(q, logical_block_size);
6624     blk_queue_max_hw_sectors(q, max);
6625     blk_queue_max_segments(q, USHRT_MAX);
6626     /* With page sized segments each segment can be translated into one idaw/tidaw */
6627     blk_queue_max_segment_size(q, PAGE_SIZE);
6628     blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6629     blk_queue_dma_alignment(q, PAGE_SIZE - 1);
6630 }
6631
6632 static struct ccw_driver dasd_eckd_driver = {
6633     .driver = {
6634         .name   = "dasd-eckd",
6635         .owner  = THIS_MODULE,
6636         .dev_groups = dasd_dev_groups,
6637     },
6638     .ids         = dasd_eckd_ids,
6639     .probe       = dasd_eckd_probe,
6640     .remove      = dasd_generic_remove,
6641     .set_offline = dasd_generic_set_offline,
6642     .set_online  = dasd_eckd_set_online,
6643     .notify      = dasd_generic_notify,
6644     .path_event  = dasd_generic_path_event,
6645     .shutdown    = dasd_generic_shutdown,
6646     .uc_handler  = dasd_generic_uc_handler,
6647     .int_class   = IRQIO_DAS,
6648 };
6649
6650 static struct dasd_discipline dasd_eckd_discipline = {
6651     .owner = THIS_MODULE,
6652     .name = "ECKD",
6653     .ebcname = "ECKD",
6654     .check_device = dasd_eckd_check_characteristics,
6655     .uncheck_device = dasd_eckd_uncheck_device,
6656     .do_analysis = dasd_eckd_do_analysis,
6657     .pe_handler = dasd_eckd_pe_handler,
6658     .basic_to_ready = dasd_eckd_basic_to_ready,
6659     .online_to_ready = dasd_eckd_online_to_ready,
6660     .basic_to_known = dasd_eckd_basic_to_known,
6661     .setup_blk_queue = dasd_eckd_setup_blk_queue,
6662     .fill_geometry = dasd_eckd_fill_geometry,
6663     .start_IO = dasd_start_IO,
6664     .term_IO = dasd_term_IO,
6665     .handle_terminated_request = dasd_eckd_handle_terminated_request,
6666     .format_device = dasd_eckd_format_device,
6667     .check_device_format = dasd_eckd_check_device_format,
6668     .erp_action = dasd_eckd_erp_action,
6669     .erp_postaction = dasd_eckd_erp_postaction,
6670     .check_for_device_change = dasd_eckd_check_for_device_change,
6671     .build_cp = dasd_eckd_build_alias_cp,
6672     .free_cp = dasd_eckd_free_alias_cp,
6673     .dump_sense = dasd_eckd_dump_sense,
6674     .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6675     .fill_info = dasd_eckd_fill_info,
6676     .ioctl = dasd_eckd_ioctl,
6677     .reload = dasd_eckd_reload_device,
6678     .get_uid = dasd_eckd_get_uid,
6679     .kick_validate = dasd_eckd_kick_validate_server,
6680     .check_attention = dasd_eckd_check_attention,
6681     .host_access_count = dasd_eckd_host_access_count,
6682     .hosts_print = dasd_hosts_print,
6683     .handle_hpf_error = dasd_eckd_handle_hpf_error,
6684     .disable_hpf = dasd_eckd_disable_hpf_device,
6685     .hpf_enabled = dasd_eckd_hpf_enabled,
6686     .reset_path = dasd_eckd_reset_path,
6687     .is_ese = dasd_eckd_is_ese,
6688     .space_allocated = dasd_eckd_space_allocated,
6689     .space_configured = dasd_eckd_space_configured,
6690     .logical_capacity = dasd_eckd_logical_capacity,
6691     .release_space = dasd_eckd_release_space,
6692     .ext_pool_id = dasd_eckd_ext_pool_id,
6693     .ext_size = dasd_eckd_ext_size,
6694     .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6695     .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6696     .ext_pool_oos = dasd_eckd_ext_pool_oos,
6697     .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6698     .ese_format = dasd_eckd_ese_format,
6699     .ese_read = dasd_eckd_ese_read,
6700 };
6701
6702 static int __init
6703 dasd_eckd_init(void)
6704 {
6705     int ret;
6706
6707     ASCEBC(dasd_eckd_discipline.ebcname, 4);
6708     dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6709                    GFP_KERNEL | GFP_DMA);
6710     if (!dasd_reserve_req)
6711         return -ENOMEM;
6712     dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6713                     GFP_KERNEL | GFP_DMA);
6714     if (!dasd_vol_info_req)
6715         return -ENOMEM;
6716     pe_handler_worker = kmalloc(sizeof(*pe_handler_worker),
6717                     GFP_KERNEL | GFP_DMA);
6718     if (!pe_handler_worker) {
6719         kfree(dasd_reserve_req);
6720         kfree(dasd_vol_info_req);
6721         return -ENOMEM;
6722     }
6723     rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6724     if (!rawpadpage) {
6725         kfree(pe_handler_worker);
6726         kfree(dasd_reserve_req);
6727         kfree(dasd_vol_info_req);
6728         return -ENOMEM;
6729     }
6730     ret = ccw_driver_register(&dasd_eckd_driver);
6731     if (!ret)
6732         wait_for_device_probe();
6733     else {
6734         kfree(pe_handler_worker);
6735         kfree(dasd_reserve_req);
6736         kfree(dasd_vol_info_req);
6737         free_page((unsigned long)rawpadpage);
6738     }
6739     return ret;
6740 }
6741
6742 static void __exit
6743 dasd_eckd_cleanup(void)
6744 {
6745     ccw_driver_unregister(&dasd_eckd_driver);
6746     kfree(pe_handler_worker);
6747     kfree(dasd_reserve_req);
6748     free_page((unsigned long)rawpadpage);
6749 }
6750
6751 module_init(dasd_eckd_init);
6752 module_exit(dasd_eckd_cleanup);