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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
0004  * Bugreports.to..: <Linux390@de.ibm.com>
0005  * Copyright IBM Corp. 1999, 2009
0006  */
0007 
0008 #define KMSG_COMPONENT "dasd-fba"
0009 
0010 #include <linux/stddef.h>
0011 #include <linux/kernel.h>
0012 #include <asm/debug.h>
0013 
0014 #include <linux/slab.h>
0015 #include <linux/hdreg.h>    /* HDIO_GETGEO              */
0016 #include <linux/bio.h>
0017 #include <linux/module.h>
0018 #include <linux/init.h>
0019 
0020 #include <asm/idals.h>
0021 #include <asm/ebcdic.h>
0022 #include <asm/io.h>
0023 #include <asm/ccwdev.h>
0024 
0025 #include "dasd_int.h"
0026 #include "dasd_fba.h"
0027 
0028 #ifdef PRINTK_HEADER
0029 #undef PRINTK_HEADER
0030 #endif              /* PRINTK_HEADER */
0031 #define PRINTK_HEADER "dasd(fba):"
0032 
0033 #define FBA_DEFAULT_RETRIES 32
0034 
0035 #define DASD_FBA_CCW_WRITE 0x41
0036 #define DASD_FBA_CCW_READ 0x42
0037 #define DASD_FBA_CCW_LOCATE 0x43
0038 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
0039 
0040 MODULE_LICENSE("GPL");
0041 
0042 static struct dasd_discipline dasd_fba_discipline;
0043 static void *dasd_fba_zero_page;
0044 
0045 struct dasd_fba_private {
0046     struct dasd_fba_characteristics rdc_data;
0047 };
0048 
0049 static struct ccw_device_id dasd_fba_ids[] = {
0050     { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
0051     { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
0052     { /* end of list */ },
0053 };
0054 
0055 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
0056 
0057 static int
0058 dasd_fba_set_online(struct ccw_device *cdev)
0059 {
0060     return dasd_generic_set_online(cdev, &dasd_fba_discipline);
0061 }
0062 
0063 static struct ccw_driver dasd_fba_driver = {
0064     .driver = {
0065         .name   = "dasd-fba",
0066         .owner  = THIS_MODULE,
0067         .dev_groups = dasd_dev_groups,
0068     },
0069     .ids         = dasd_fba_ids,
0070     .probe       = dasd_generic_probe,
0071     .remove      = dasd_generic_remove,
0072     .set_offline = dasd_generic_set_offline,
0073     .set_online  = dasd_fba_set_online,
0074     .notify      = dasd_generic_notify,
0075     .path_event  = dasd_generic_path_event,
0076     .int_class   = IRQIO_DAS,
0077 };
0078 
0079 static void
0080 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
0081           int blksize, int beg, int nr)
0082 {
0083     ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
0084     ccw->flags = 0;
0085     ccw->count = 16;
0086     ccw->cda = (__u32) __pa(data);
0087     memset(data, 0, sizeof (struct DE_fba_data));
0088     if (rw == WRITE)
0089         (data->mask).perm = 0x0;
0090     else if (rw == READ)
0091         (data->mask).perm = 0x1;
0092     else
0093         data->mask.perm = 0x2;
0094     data->blk_size = blksize;
0095     data->ext_loc = beg;
0096     data->ext_end = nr - 1;
0097 }
0098 
0099 static void
0100 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
0101           int block_nr, int block_ct)
0102 {
0103     ccw->cmd_code = DASD_FBA_CCW_LOCATE;
0104     ccw->flags = 0;
0105     ccw->count = 8;
0106     ccw->cda = (__u32) __pa(data);
0107     memset(data, 0, sizeof (struct LO_fba_data));
0108     if (rw == WRITE)
0109         data->operation.cmd = 0x5;
0110     else if (rw == READ)
0111         data->operation.cmd = 0x6;
0112     else
0113         data->operation.cmd = 0x8;
0114     data->blk_nr = block_nr;
0115     data->blk_ct = block_ct;
0116 }
0117 
0118 static int
0119 dasd_fba_check_characteristics(struct dasd_device *device)
0120 {
0121     struct dasd_fba_private *private = device->private;
0122     struct ccw_device *cdev = device->cdev;
0123     struct dasd_block *block;
0124     int readonly, rc;
0125 
0126     if (!private) {
0127         private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
0128         if (!private) {
0129             dev_warn(&device->cdev->dev,
0130                  "Allocating memory for private DASD "
0131                  "data failed\n");
0132             return -ENOMEM;
0133         }
0134         device->private = private;
0135     } else {
0136         memset(private, 0, sizeof(*private));
0137     }
0138     block = dasd_alloc_block();
0139     if (IS_ERR(block)) {
0140         DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
0141                 "dasd block structure");
0142         device->private = NULL;
0143         kfree(private);
0144         return PTR_ERR(block);
0145     }
0146     device->block = block;
0147     block->base = device;
0148 
0149     /* Read Device Characteristics */
0150     rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
0151                      &private->rdc_data, 32);
0152     if (rc) {
0153         DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
0154                 "characteristics returned error %d", rc);
0155         device->block = NULL;
0156         dasd_free_block(block);
0157         device->private = NULL;
0158         kfree(private);
0159         return rc;
0160     }
0161 
0162     device->default_expires = DASD_EXPIRES;
0163     device->default_retries = FBA_DEFAULT_RETRIES;
0164     dasd_path_set_opm(device, LPM_ANYPATH);
0165 
0166     readonly = dasd_device_is_ro(device);
0167     if (readonly)
0168         set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
0169 
0170     /* FBA supports discard, set the according feature bit */
0171     dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
0172 
0173     dev_info(&device->cdev->dev,
0174          "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
0175          "and %d B/blk%s\n",
0176          cdev->id.dev_type,
0177          cdev->id.dev_model,
0178          cdev->id.cu_type,
0179          cdev->id.cu_model,
0180          ((private->rdc_data.blk_bdsa *
0181            (private->rdc_data.blk_size >> 9)) >> 11),
0182          private->rdc_data.blk_size,
0183          readonly ? ", read-only device" : "");
0184     return 0;
0185 }
0186 
0187 static int dasd_fba_do_analysis(struct dasd_block *block)
0188 {
0189     struct dasd_fba_private *private = block->base->private;
0190     int sb, rc;
0191 
0192     rc = dasd_check_blocksize(private->rdc_data.blk_size);
0193     if (rc) {
0194         DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
0195                 private->rdc_data.blk_size);
0196         return rc;
0197     }
0198     block->blocks = private->rdc_data.blk_bdsa;
0199     block->bp_block = private->rdc_data.blk_size;
0200     block->s2b_shift = 0;   /* bits to shift 512 to get a block */
0201     for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
0202         block->s2b_shift++;
0203     return 0;
0204 }
0205 
0206 static int dasd_fba_fill_geometry(struct dasd_block *block,
0207                   struct hd_geometry *geo)
0208 {
0209     if (dasd_check_blocksize(block->bp_block) != 0)
0210         return -EINVAL;
0211     geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
0212     geo->heads = 16;
0213     geo->sectors = 128 >> block->s2b_shift;
0214     return 0;
0215 }
0216 
0217 static dasd_erp_fn_t
0218 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
0219 {
0220     return dasd_default_erp_action;
0221 }
0222 
0223 static dasd_erp_fn_t
0224 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
0225 {
0226     if (cqr->function == dasd_default_erp_action)
0227         return dasd_default_erp_postaction;
0228 
0229     DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
0230             cqr->function);
0231     return NULL;
0232 }
0233 
0234 static void dasd_fba_check_for_device_change(struct dasd_device *device,
0235                          struct dasd_ccw_req *cqr,
0236                          struct irb *irb)
0237 {
0238     char mask;
0239 
0240     /* first of all check for state change pending interrupt */
0241     mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
0242     if ((irb->scsw.cmd.dstat & mask) == mask)
0243         dasd_generic_handle_state_change(device);
0244 };
0245 
0246 
0247 /*
0248  * Builds a CCW with no data payload
0249  */
0250 static void ccw_write_no_data(struct ccw1 *ccw)
0251 {
0252     ccw->cmd_code = DASD_FBA_CCW_WRITE;
0253     ccw->flags |= CCW_FLAG_SLI;
0254     ccw->count = 0;
0255 }
0256 
0257 /*
0258  * Builds a CCW that writes only zeroes.
0259  */
0260 static void ccw_write_zero(struct ccw1 *ccw, int count)
0261 {
0262     ccw->cmd_code = DASD_FBA_CCW_WRITE;
0263     ccw->flags |= CCW_FLAG_SLI;
0264     ccw->count = count;
0265     ccw->cda = (__u32) (addr_t) dasd_fba_zero_page;
0266 }
0267 
0268 /*
0269  * Helper function to count the amount of necessary CCWs within a given range
0270  * with 4k alignment and command chaining in mind.
0271  */
0272 static int count_ccws(sector_t first_rec, sector_t last_rec,
0273               unsigned int blocks_per_page)
0274 {
0275     sector_t wz_stop = 0, d_stop = 0;
0276     int cur_pos = 0;
0277     int count = 0;
0278 
0279     if (first_rec % blocks_per_page != 0) {
0280         wz_stop = first_rec + blocks_per_page -
0281             (first_rec % blocks_per_page) - 1;
0282         if (wz_stop > last_rec)
0283             wz_stop = last_rec;
0284         cur_pos = wz_stop - first_rec + 1;
0285         count++;
0286     }
0287 
0288     if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
0289         if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
0290             d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
0291                          blocks_per_page);
0292         else
0293             d_stop = last_rec;
0294 
0295         cur_pos += d_stop - (first_rec + cur_pos) + 1;
0296         count++;
0297     }
0298 
0299     if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
0300         count++;
0301 
0302     return count;
0303 }
0304 
0305 /*
0306  * This function builds a CCW request for block layer discard requests.
0307  * Each page in the z/VM hypervisor that represents certain records of an FBA
0308  * device will be padded with zeros. This is a special behaviour of the WRITE
0309  * command which is triggered when no data payload is added to the CCW.
0310  *
0311  * Note: Due to issues in some z/VM versions, we can't fully utilise this
0312  * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
0313  * work around those issues and write actual zeroes to the unaligned parts in
0314  * the request. This workaround might be removed in the future.
0315  */
0316 static struct dasd_ccw_req *dasd_fba_build_cp_discard(
0317                         struct dasd_device *memdev,
0318                         struct dasd_block *block,
0319                         struct request *req)
0320 {
0321     struct LO_fba_data *LO_data;
0322     struct dasd_ccw_req *cqr;
0323     struct ccw1 *ccw;
0324 
0325     sector_t wz_stop = 0, d_stop = 0;
0326     sector_t first_rec, last_rec;
0327 
0328     unsigned int blksize = block->bp_block;
0329     unsigned int blocks_per_page;
0330     int wz_count = 0;
0331     int d_count = 0;
0332     int cur_pos = 0; /* Current position within the extent */
0333     int count = 0;
0334     int cplength;
0335     int datasize;
0336     int nr_ccws;
0337 
0338     first_rec = blk_rq_pos(req) >> block->s2b_shift;
0339     last_rec =
0340         (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
0341     count = last_rec - first_rec + 1;
0342 
0343     blocks_per_page = BLOCKS_PER_PAGE(blksize);
0344     nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
0345 
0346     /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
0347     cplength = 1 + 2 * nr_ccws;
0348     datasize = sizeof(struct DE_fba_data) +
0349         nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
0350 
0351     cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
0352                    blk_mq_rq_to_pdu(req));
0353     if (IS_ERR(cqr))
0354         return cqr;
0355 
0356     ccw = cqr->cpaddr;
0357 
0358     define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
0359     LO_data = cqr->data + sizeof(struct DE_fba_data);
0360 
0361     /* First part is not aligned. Calculate range to write zeroes. */
0362     if (first_rec % blocks_per_page != 0) {
0363         wz_stop = first_rec + blocks_per_page -
0364             (first_rec % blocks_per_page) - 1;
0365         if (wz_stop > last_rec)
0366             wz_stop = last_rec;
0367         wz_count = wz_stop - first_rec + 1;
0368 
0369         ccw[-1].flags |= CCW_FLAG_CC;
0370         locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
0371 
0372         ccw[-1].flags |= CCW_FLAG_CC;
0373         ccw_write_zero(ccw++, wz_count * blksize);
0374 
0375         cur_pos = wz_count;
0376     }
0377 
0378     /* We can do proper discard when we've got at least blocks_per_page blocks. */
0379     if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
0380         /* is last record at page boundary? */
0381         if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
0382             d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
0383                          blocks_per_page);
0384         else
0385             d_stop = last_rec;
0386 
0387         d_count = d_stop - (first_rec + cur_pos) + 1;
0388 
0389         ccw[-1].flags |= CCW_FLAG_CC;
0390         locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
0391 
0392         ccw[-1].flags |= CCW_FLAG_CC;
0393         ccw_write_no_data(ccw++);
0394 
0395         cur_pos += d_count;
0396     }
0397 
0398     /* We might still have some bits left which need to be zeroed. */
0399     if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) {
0400         if (d_stop != 0)
0401             wz_count = last_rec - d_stop;
0402         else if (wz_stop != 0)
0403             wz_count = last_rec - wz_stop;
0404         else
0405             wz_count = count;
0406 
0407         ccw[-1].flags |= CCW_FLAG_CC;
0408         locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
0409 
0410         ccw[-1].flags |= CCW_FLAG_CC;
0411         ccw_write_zero(ccw++, wz_count * blksize);
0412     }
0413 
0414     if (blk_noretry_request(req) ||
0415         block->base->features & DASD_FEATURE_FAILFAST)
0416         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
0417 
0418     cqr->startdev = memdev;
0419     cqr->memdev = memdev;
0420     cqr->block = block;
0421     cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
0422     cqr->retries = memdev->default_retries;
0423     cqr->buildclk = get_tod_clock();
0424     cqr->status = DASD_CQR_FILLED;
0425 
0426     return cqr;
0427 }
0428 
0429 static struct dasd_ccw_req *dasd_fba_build_cp_regular(
0430                         struct dasd_device *memdev,
0431                         struct dasd_block *block,
0432                         struct request *req)
0433 {
0434     struct dasd_fba_private *private = block->base->private;
0435     unsigned long *idaws;
0436     struct LO_fba_data *LO_data;
0437     struct dasd_ccw_req *cqr;
0438     struct ccw1 *ccw;
0439     struct req_iterator iter;
0440     struct bio_vec bv;
0441     char *dst;
0442     int count, cidaw, cplength, datasize;
0443     sector_t recid, first_rec, last_rec;
0444     unsigned int blksize, off;
0445     unsigned char cmd;
0446 
0447     if (rq_data_dir(req) == READ) {
0448         cmd = DASD_FBA_CCW_READ;
0449     } else if (rq_data_dir(req) == WRITE) {
0450         cmd = DASD_FBA_CCW_WRITE;
0451     } else
0452         return ERR_PTR(-EINVAL);
0453     blksize = block->bp_block;
0454     /* Calculate record id of first and last block. */
0455     first_rec = blk_rq_pos(req) >> block->s2b_shift;
0456     last_rec =
0457         (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
0458     /* Check struct bio and count the number of blocks for the request. */
0459     count = 0;
0460     cidaw = 0;
0461     rq_for_each_segment(bv, req, iter) {
0462         if (bv.bv_len & (blksize - 1))
0463             /* Fba can only do full blocks. */
0464             return ERR_PTR(-EINVAL);
0465         count += bv.bv_len >> (block->s2b_shift + 9);
0466         if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
0467             cidaw += bv.bv_len / blksize;
0468     }
0469     /* Paranoia. */
0470     if (count != last_rec - first_rec + 1)
0471         return ERR_PTR(-EINVAL);
0472     /* 1x define extent + 1x locate record + number of blocks */
0473     cplength = 2 + count;
0474     /* 1x define extent + 1x locate record */
0475     datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
0476         cidaw * sizeof(unsigned long);
0477     /*
0478      * Find out number of additional locate record ccws if the device
0479      * can't do data chaining.
0480      */
0481     if (private->rdc_data.mode.bits.data_chain == 0) {
0482         cplength += count - 1;
0483         datasize += (count - 1)*sizeof(struct LO_fba_data);
0484     }
0485     /* Allocate the ccw request. */
0486     cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
0487                    blk_mq_rq_to_pdu(req));
0488     if (IS_ERR(cqr))
0489         return cqr;
0490     ccw = cqr->cpaddr;
0491     /* First ccw is define extent. */
0492     define_extent(ccw++, cqr->data, rq_data_dir(req),
0493               block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
0494     /* Build locate_record + read/write ccws. */
0495     idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
0496     LO_data = (struct LO_fba_data *) (idaws + cidaw);
0497     /* Locate record for all blocks for smart devices. */
0498     if (private->rdc_data.mode.bits.data_chain != 0) {
0499         ccw[-1].flags |= CCW_FLAG_CC;
0500         locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
0501     }
0502     recid = first_rec;
0503     rq_for_each_segment(bv, req, iter) {
0504         dst = bvec_virt(&bv);
0505         if (dasd_page_cache) {
0506             char *copy = kmem_cache_alloc(dasd_page_cache,
0507                               GFP_DMA | __GFP_NOWARN);
0508             if (copy && rq_data_dir(req) == WRITE)
0509                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
0510             if (copy)
0511                 dst = copy + bv.bv_offset;
0512         }
0513         for (off = 0; off < bv.bv_len; off += blksize) {
0514             /* Locate record for stupid devices. */
0515             if (private->rdc_data.mode.bits.data_chain == 0) {
0516                 ccw[-1].flags |= CCW_FLAG_CC;
0517                 locate_record(ccw, LO_data++,
0518                           rq_data_dir(req),
0519                           recid - first_rec, 1);
0520                 ccw->flags = CCW_FLAG_CC;
0521                 ccw++;
0522             } else {
0523                 if (recid > first_rec)
0524                     ccw[-1].flags |= CCW_FLAG_DC;
0525                 else
0526                     ccw[-1].flags |= CCW_FLAG_CC;
0527             }
0528             ccw->cmd_code = cmd;
0529             ccw->count = block->bp_block;
0530             if (idal_is_needed(dst, blksize)) {
0531                 ccw->cda = (__u32)(addr_t) idaws;
0532                 ccw->flags = CCW_FLAG_IDA;
0533                 idaws = idal_create_words(idaws, dst, blksize);
0534             } else {
0535                 ccw->cda = (__u32)(addr_t) dst;
0536                 ccw->flags = 0;
0537             }
0538             ccw++;
0539             dst += blksize;
0540             recid++;
0541         }
0542     }
0543     if (blk_noretry_request(req) ||
0544         block->base->features & DASD_FEATURE_FAILFAST)
0545         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
0546     cqr->startdev = memdev;
0547     cqr->memdev = memdev;
0548     cqr->block = block;
0549     cqr->expires = memdev->default_expires * HZ;    /* default 5 minutes */
0550     cqr->retries = memdev->default_retries;
0551     cqr->buildclk = get_tod_clock();
0552     cqr->status = DASD_CQR_FILLED;
0553     return cqr;
0554 }
0555 
0556 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
0557                           struct dasd_block *block,
0558                           struct request *req)
0559 {
0560     if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
0561         return dasd_fba_build_cp_discard(memdev, block, req);
0562     else
0563         return dasd_fba_build_cp_regular(memdev, block, req);
0564 }
0565 
0566 static int
0567 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
0568 {
0569     struct dasd_fba_private *private = cqr->block->base->private;
0570     struct ccw1 *ccw;
0571     struct req_iterator iter;
0572     struct bio_vec bv;
0573     char *dst, *cda;
0574     unsigned int blksize, off;
0575     int status;
0576 
0577     if (!dasd_page_cache)
0578         goto out;
0579     blksize = cqr->block->bp_block;
0580     ccw = cqr->cpaddr;
0581     /* Skip over define extent & locate record. */
0582     ccw++;
0583     if (private->rdc_data.mode.bits.data_chain != 0)
0584         ccw++;
0585     rq_for_each_segment(bv, req, iter) {
0586         dst = bvec_virt(&bv);
0587         for (off = 0; off < bv.bv_len; off += blksize) {
0588             /* Skip locate record. */
0589             if (private->rdc_data.mode.bits.data_chain == 0)
0590                 ccw++;
0591             if (dst) {
0592                 if (ccw->flags & CCW_FLAG_IDA)
0593                     cda = *((char **)((addr_t) ccw->cda));
0594                 else
0595                     cda = (char *)((addr_t) ccw->cda);
0596                 if (dst != cda) {
0597                     if (rq_data_dir(req) == READ)
0598                         memcpy(dst, cda, bv.bv_len);
0599                     kmem_cache_free(dasd_page_cache,
0600                         (void *)((addr_t)cda & PAGE_MASK));
0601                 }
0602                 dst = NULL;
0603             }
0604             ccw++;
0605         }
0606     }
0607 out:
0608     status = cqr->status == DASD_CQR_DONE;
0609     dasd_sfree_request(cqr, cqr->memdev);
0610     return status;
0611 }
0612 
0613 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
0614 {
0615     if (cqr->retries < 0)
0616         cqr->status = DASD_CQR_FAILED;
0617     else
0618         cqr->status = DASD_CQR_FILLED;
0619 };
0620 
0621 static int
0622 dasd_fba_fill_info(struct dasd_device * device,
0623            struct dasd_information2_t * info)
0624 {
0625     struct dasd_fba_private *private = device->private;
0626 
0627     info->label_block = 1;
0628     info->FBA_layout = 1;
0629     info->format = DASD_FORMAT_LDL;
0630     info->characteristics_size = sizeof(private->rdc_data);
0631     memcpy(info->characteristics, &private->rdc_data,
0632            sizeof(private->rdc_data));
0633     info->confdata_size = 0;
0634     return 0;
0635 }
0636 
0637 static void
0638 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
0639             char *reason)
0640 {
0641     u64 *sense;
0642 
0643     sense = (u64 *) dasd_get_sense(irb);
0644     if (sense) {
0645         DBF_DEV_EVENT(DBF_EMERG, device,
0646                   "%s: %s %02x%02x%02x %016llx %016llx %016llx "
0647                   "%016llx", reason,
0648                   scsw_is_tm(&irb->scsw) ? "t" : "c",
0649                   scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
0650                   scsw_dstat(&irb->scsw), sense[0], sense[1],
0651                   sense[2], sense[3]);
0652     } else {
0653         DBF_DEV_EVENT(DBF_EMERG, device, "%s",
0654                   "SORRY - NO VALID SENSE AVAILABLE\n");
0655     }
0656 }
0657 
0658 
0659 static void
0660 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
0661             struct irb *irb)
0662 {
0663     char *page;
0664     struct ccw1 *act, *end, *last;
0665     int len, sl, sct, count;
0666 
0667     page = (char *) get_zeroed_page(GFP_ATOMIC);
0668     if (page == NULL) {
0669         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
0670                 "No memory to dump sense data");
0671         return;
0672     }
0673     len = sprintf(page, PRINTK_HEADER
0674               " I/O status report for device %s:\n",
0675               dev_name(&device->cdev->dev));
0676     len += sprintf(page + len, PRINTK_HEADER
0677                " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
0678                irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
0679     len += sprintf(page + len, PRINTK_HEADER
0680                " device %s: Failing CCW: %p\n",
0681                dev_name(&device->cdev->dev),
0682                (void *) (addr_t) irb->scsw.cmd.cpa);
0683     if (irb->esw.esw0.erw.cons) {
0684         for (sl = 0; sl < 4; sl++) {
0685             len += sprintf(page + len, PRINTK_HEADER
0686                        " Sense(hex) %2d-%2d:",
0687                        (8 * sl), ((8 * sl) + 7));
0688 
0689             for (sct = 0; sct < 8; sct++) {
0690                 len += sprintf(page + len, " %02x",
0691                            irb->ecw[8 * sl + sct]);
0692             }
0693             len += sprintf(page + len, "\n");
0694         }
0695     } else {
0696         len += sprintf(page + len, PRINTK_HEADER
0697                    " SORRY - NO VALID SENSE AVAILABLE\n");
0698     }
0699     printk(KERN_ERR "%s", page);
0700 
0701     /* dump the Channel Program */
0702     /* print first CCWs (maximum 8) */
0703     act = req->cpaddr;
0704         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
0705     end = min(act + 8, last);
0706     len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
0707     while (act <= end) {
0708         len += sprintf(page + len, PRINTK_HEADER
0709                    " CCW %p: %08X %08X DAT:",
0710                    act, ((int *) act)[0], ((int *) act)[1]);
0711         for (count = 0; count < 32 && count < act->count;
0712              count += sizeof(int))
0713             len += sprintf(page + len, " %08X",
0714                        ((int *) (addr_t) act->cda)
0715                        [(count>>2)]);
0716         len += sprintf(page + len, "\n");
0717         act++;
0718     }
0719     printk(KERN_ERR "%s", page);
0720 
0721 
0722     /* print failing CCW area */
0723     len = 0;
0724     if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
0725         act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
0726         len += sprintf(page + len, PRINTK_HEADER "......\n");
0727     }
0728     end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
0729     while (act <= end) {
0730         len += sprintf(page + len, PRINTK_HEADER
0731                    " CCW %p: %08X %08X DAT:",
0732                    act, ((int *) act)[0], ((int *) act)[1]);
0733         for (count = 0; count < 32 && count < act->count;
0734              count += sizeof(int))
0735             len += sprintf(page + len, " %08X",
0736                        ((int *) (addr_t) act->cda)
0737                        [(count>>2)]);
0738         len += sprintf(page + len, "\n");
0739         act++;
0740     }
0741 
0742     /* print last CCWs */
0743     if (act <  last - 2) {
0744         act = last - 2;
0745         len += sprintf(page + len, PRINTK_HEADER "......\n");
0746     }
0747     while (act <= last) {
0748         len += sprintf(page + len, PRINTK_HEADER
0749                    " CCW %p: %08X %08X DAT:",
0750                    act, ((int *) act)[0], ((int *) act)[1]);
0751         for (count = 0; count < 32 && count < act->count;
0752              count += sizeof(int))
0753             len += sprintf(page + len, " %08X",
0754                        ((int *) (addr_t) act->cda)
0755                        [(count>>2)]);
0756         len += sprintf(page + len, "\n");
0757         act++;
0758     }
0759     if (len > 0)
0760         printk(KERN_ERR "%s", page);
0761     free_page((unsigned long) page);
0762 }
0763 
0764 /*
0765  * Initialize block layer request queue.
0766  */
0767 static void dasd_fba_setup_blk_queue(struct dasd_block *block)
0768 {
0769     unsigned int logical_block_size = block->bp_block;
0770     struct request_queue *q = block->request_queue;
0771     unsigned int max_bytes, max_discard_sectors;
0772     int max;
0773 
0774     max = DASD_FBA_MAX_BLOCKS << block->s2b_shift;
0775     blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
0776     q->limits.max_dev_sectors = max;
0777     blk_queue_logical_block_size(q, logical_block_size);
0778     blk_queue_max_hw_sectors(q, max);
0779     blk_queue_max_segments(q, USHRT_MAX);
0780     /* With page sized segments each segment can be translated into one idaw/tidaw */
0781     blk_queue_max_segment_size(q, PAGE_SIZE);
0782     blk_queue_segment_boundary(q, PAGE_SIZE - 1);
0783 
0784     q->limits.discard_granularity = logical_block_size;
0785 
0786     /* Calculate max_discard_sectors and make it PAGE aligned */
0787     max_bytes = USHRT_MAX * logical_block_size;
0788     max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE);
0789     max_discard_sectors = max_bytes / logical_block_size;
0790 
0791     blk_queue_max_discard_sectors(q, max_discard_sectors);
0792     blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
0793 }
0794 
0795 static int dasd_fba_pe_handler(struct dasd_device *device,
0796                    __u8 tbvpm, __u8 fcsecpm)
0797 {
0798     return dasd_generic_verify_path(device, tbvpm);
0799 }
0800 
0801 static struct dasd_discipline dasd_fba_discipline = {
0802     .owner = THIS_MODULE,
0803     .name = "FBA ",
0804     .ebcname = "FBA ",
0805     .check_device = dasd_fba_check_characteristics,
0806     .do_analysis = dasd_fba_do_analysis,
0807     .pe_handler = dasd_fba_pe_handler,
0808     .setup_blk_queue = dasd_fba_setup_blk_queue,
0809     .fill_geometry = dasd_fba_fill_geometry,
0810     .start_IO = dasd_start_IO,
0811     .term_IO = dasd_term_IO,
0812     .handle_terminated_request = dasd_fba_handle_terminated_request,
0813     .erp_action = dasd_fba_erp_action,
0814     .erp_postaction = dasd_fba_erp_postaction,
0815     .check_for_device_change = dasd_fba_check_for_device_change,
0816     .build_cp = dasd_fba_build_cp,
0817     .free_cp = dasd_fba_free_cp,
0818     .dump_sense = dasd_fba_dump_sense,
0819     .dump_sense_dbf = dasd_fba_dump_sense_dbf,
0820     .fill_info = dasd_fba_fill_info,
0821 };
0822 
0823 static int __init
0824 dasd_fba_init(void)
0825 {
0826     int ret;
0827 
0828     ASCEBC(dasd_fba_discipline.ebcname, 4);
0829 
0830     dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
0831     if (!dasd_fba_zero_page)
0832         return -ENOMEM;
0833 
0834     ret = ccw_driver_register(&dasd_fba_driver);
0835     if (!ret)
0836         wait_for_device_probe();
0837 
0838     return ret;
0839 }
0840 
0841 static void __exit
0842 dasd_fba_cleanup(void)
0843 {
0844     ccw_driver_unregister(&dasd_fba_driver);
0845     free_page((unsigned long)dasd_fba_zero_page);
0846 }
0847 
0848 module_init(dasd_fba_init);
0849 module_exit(dasd_fba_cleanup);
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