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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2005-2006 Dell Inc.
0004  *
0005  * Serial Attached SCSI (SAS) transport class.
0006  *
0007  * The SAS transport class contains common code to deal with SAS HBAs,
0008  * an aproximated representation of SAS topologies in the driver model,
0009  * and various sysfs attributes to expose these topologies and management
0010  * interfaces to userspace.
0011  *
0012  * In addition to the basic SCSI core objects this transport class
0013  * introduces two additional intermediate objects:  The SAS PHY
0014  * as represented by struct sas_phy defines an "outgoing" PHY on
0015  * a SAS HBA or Expander, and the SAS remote PHY represented by
0016  * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
0017  * end device.  Note that this is purely a software concept, the
0018  * underlying hardware for a PHY and a remote PHY is the exactly
0019  * the same.
0020  *
0021  * There is no concept of a SAS port in this code, users can see
0022  * what PHYs form a wide port based on the port_identifier attribute,
0023  * which is the same for all PHYs in a port.
0024  */
0025 
0026 #include <linux/init.h>
0027 #include <linux/module.h>
0028 #include <linux/jiffies.h>
0029 #include <linux/err.h>
0030 #include <linux/slab.h>
0031 #include <linux/string.h>
0032 #include <linux/blkdev.h>
0033 #include <linux/bsg.h>
0034 
0035 #include <scsi/scsi.h>
0036 #include <scsi/scsi_cmnd.h>
0037 #include <scsi/scsi_device.h>
0038 #include <scsi/scsi_host.h>
0039 #include <scsi/scsi_transport.h>
0040 #include <scsi/scsi_transport_sas.h>
0041 
0042 #include "scsi_sas_internal.h"
0043 struct sas_host_attrs {
0044     struct list_head rphy_list;
0045     struct mutex lock;
0046     struct request_queue *q;
0047     u32 next_target_id;
0048     u32 next_expander_id;
0049     int next_port_id;
0050 };
0051 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
0052 
0053 
0054 /*
0055  * Hack to allow attributes of the same name in different objects.
0056  */
0057 #define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
0058     struct device_attribute dev_attr_##_prefix##_##_name = \
0059     __ATTR(_name,_mode,_show,_store)
0060 
0061 
0062 /*
0063  * Pretty printing helpers
0064  */
0065 
0066 #define sas_bitfield_name_match(title, table)           \
0067 static ssize_t                          \
0068 get_sas_##title##_names(u32 table_key, char *buf)       \
0069 {                               \
0070     char *prefix = "";                  \
0071     ssize_t len = 0;                    \
0072     int i;                          \
0073                                 \
0074     for (i = 0; i < ARRAY_SIZE(table); i++) {       \
0075         if (table[i].value & table_key) {       \
0076             len += sprintf(buf + len, "%s%s",   \
0077                 prefix, table[i].name);     \
0078             prefix = ", ";              \
0079         }                       \
0080     }                           \
0081     len += sprintf(buf + len, "\n");            \
0082     return len;                     \
0083 }
0084 
0085 #define sas_bitfield_name_set(title, table)         \
0086 static ssize_t                          \
0087 set_sas_##title##_names(u32 *table_key, const char *buf)    \
0088 {                               \
0089     ssize_t len = 0;                    \
0090     int i;                          \
0091                                 \
0092     for (i = 0; i < ARRAY_SIZE(table); i++) {       \
0093         len = strlen(table[i].name);            \
0094         if (strncmp(buf, table[i].name, len) == 0 &&    \
0095             (buf[len] == '\n' || buf[len] == '\0')) {   \
0096             *table_key = table[i].value;        \
0097             return 0;               \
0098         }                       \
0099     }                           \
0100     return -EINVAL;                     \
0101 }
0102 
0103 #define sas_bitfield_name_search(title, table)          \
0104 static ssize_t                          \
0105 get_sas_##title##_names(u32 table_key, char *buf)       \
0106 {                               \
0107     ssize_t len = 0;                    \
0108     int i;                          \
0109                                 \
0110     for (i = 0; i < ARRAY_SIZE(table); i++) {       \
0111         if (table[i].value == table_key) {      \
0112             len += sprintf(buf + len, "%s",     \
0113                 table[i].name);         \
0114             break;                  \
0115         }                       \
0116     }                           \
0117     len += sprintf(buf + len, "\n");            \
0118     return len;                     \
0119 }
0120 
0121 static struct {
0122     u32     value;
0123     char        *name;
0124 } sas_device_type_names[] = {
0125     { SAS_PHY_UNUSED,       "unused" },
0126     { SAS_END_DEVICE,       "end device" },
0127     { SAS_EDGE_EXPANDER_DEVICE, "edge expander" },
0128     { SAS_FANOUT_EXPANDER_DEVICE,   "fanout expander" },
0129 };
0130 sas_bitfield_name_search(device_type, sas_device_type_names)
0131 
0132 
0133 static struct {
0134     u32     value;
0135     char        *name;
0136 } sas_protocol_names[] = {
0137     { SAS_PROTOCOL_SATA,        "sata" },
0138     { SAS_PROTOCOL_SMP,     "smp" },
0139     { SAS_PROTOCOL_STP,     "stp" },
0140     { SAS_PROTOCOL_SSP,     "ssp" },
0141 };
0142 sas_bitfield_name_match(protocol, sas_protocol_names)
0143 
0144 static struct {
0145     u32     value;
0146     char        *name;
0147 } sas_linkspeed_names[] = {
0148     { SAS_LINK_RATE_UNKNOWN,    "Unknown" },
0149     { SAS_PHY_DISABLED,     "Phy disabled" },
0150     { SAS_LINK_RATE_FAILED,     "Link Rate failed" },
0151     { SAS_SATA_SPINUP_HOLD,     "Spin-up hold" },
0152     { SAS_LINK_RATE_1_5_GBPS,   "1.5 Gbit" },
0153     { SAS_LINK_RATE_3_0_GBPS,   "3.0 Gbit" },
0154     { SAS_LINK_RATE_6_0_GBPS,   "6.0 Gbit" },
0155     { SAS_LINK_RATE_12_0_GBPS,  "12.0 Gbit" },
0156     { SAS_LINK_RATE_22_5_GBPS,  "22.5 Gbit" },
0157 };
0158 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
0159 sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
0160 
0161 static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
0162 {
0163     struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
0164     struct sas_end_device *rdev;
0165 
0166     BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
0167 
0168     rdev = rphy_to_end_device(rphy);
0169     return rdev;
0170 }
0171 
0172 static int sas_smp_dispatch(struct bsg_job *job)
0173 {
0174     struct Scsi_Host *shost = dev_to_shost(job->dev);
0175     struct sas_rphy *rphy = NULL;
0176 
0177     if (!scsi_is_host_device(job->dev))
0178         rphy = dev_to_rphy(job->dev);
0179 
0180     if (!job->reply_payload.payload_len) {
0181         dev_warn(job->dev, "space for a smp response is missing\n");
0182         bsg_job_done(job, -EINVAL, 0);
0183         return 0;
0184     }
0185 
0186     to_sas_internal(shost->transportt)->f->smp_handler(job, shost, rphy);
0187     return 0;
0188 }
0189 
0190 static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
0191 {
0192     struct request_queue *q;
0193 
0194     if (!to_sas_internal(shost->transportt)->f->smp_handler) {
0195         printk("%s can't handle SMP requests\n", shost->hostt->name);
0196         return 0;
0197     }
0198 
0199     if (rphy) {
0200         q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev),
0201                 sas_smp_dispatch, NULL, 0);
0202         if (IS_ERR(q))
0203             return PTR_ERR(q);
0204         rphy->q = q;
0205     } else {
0206         char name[20];
0207 
0208         snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
0209         q = bsg_setup_queue(&shost->shost_gendev, name,
0210                 sas_smp_dispatch, NULL, 0);
0211         if (IS_ERR(q))
0212             return PTR_ERR(q);
0213         to_sas_host_attrs(shost)->q = q;
0214     }
0215 
0216     return 0;
0217 }
0218 
0219 /*
0220  * SAS host attributes
0221  */
0222 
0223 static int sas_host_setup(struct transport_container *tc, struct device *dev,
0224               struct device *cdev)
0225 {
0226     struct Scsi_Host *shost = dev_to_shost(dev);
0227     struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
0228     struct device *dma_dev = shost->dma_dev;
0229 
0230     INIT_LIST_HEAD(&sas_host->rphy_list);
0231     mutex_init(&sas_host->lock);
0232     sas_host->next_target_id = 0;
0233     sas_host->next_expander_id = 0;
0234     sas_host->next_port_id = 0;
0235 
0236     if (sas_bsg_initialize(shost, NULL))
0237         dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
0238                shost->host_no);
0239 
0240     if (dma_dev->dma_mask) {
0241         shost->opt_sectors = min_t(unsigned int, shost->max_sectors,
0242                 dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
0243     }
0244 
0245     return 0;
0246 }
0247 
0248 static int sas_host_remove(struct transport_container *tc, struct device *dev,
0249                struct device *cdev)
0250 {
0251     struct Scsi_Host *shost = dev_to_shost(dev);
0252     struct request_queue *q = to_sas_host_attrs(shost)->q;
0253 
0254     bsg_remove_queue(q);
0255     return 0;
0256 }
0257 
0258 static DECLARE_TRANSPORT_CLASS(sas_host_class,
0259         "sas_host", sas_host_setup, sas_host_remove, NULL);
0260 
0261 static int sas_host_match(struct attribute_container *cont,
0262                 struct device *dev)
0263 {
0264     struct Scsi_Host *shost;
0265     struct sas_internal *i;
0266 
0267     if (!scsi_is_host_device(dev))
0268         return 0;
0269     shost = dev_to_shost(dev);
0270 
0271     if (!shost->transportt)
0272         return 0;
0273     if (shost->transportt->host_attrs.ac.class !=
0274             &sas_host_class.class)
0275         return 0;
0276 
0277     i = to_sas_internal(shost->transportt);
0278     return &i->t.host_attrs.ac == cont;
0279 }
0280 
0281 static int do_sas_phy_delete(struct device *dev, void *data)
0282 {
0283     int pass = (int)(unsigned long)data;
0284 
0285     if (pass == 0 && scsi_is_sas_port(dev))
0286         sas_port_delete(dev_to_sas_port(dev));
0287     else if (pass == 1 && scsi_is_sas_phy(dev))
0288         sas_phy_delete(dev_to_phy(dev));
0289     return 0;
0290 }
0291 
0292 /**
0293  * sas_remove_children  -  tear down a devices SAS data structures
0294  * @dev:    device belonging to the sas object
0295  *
0296  * Removes all SAS PHYs and remote PHYs for a given object
0297  */
0298 void sas_remove_children(struct device *dev)
0299 {
0300     device_for_each_child(dev, (void *)0, do_sas_phy_delete);
0301     device_for_each_child(dev, (void *)1, do_sas_phy_delete);
0302 }
0303 EXPORT_SYMBOL(sas_remove_children);
0304 
0305 /**
0306  * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
0307  * @shost:  Scsi Host that is torn down
0308  *
0309  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host and remove the
0310  * Scsi_Host as well.
0311  *
0312  * Note: Do not call scsi_remove_host() on the Scsi_Host any more, as it is
0313  * already removed.
0314  */
0315 void sas_remove_host(struct Scsi_Host *shost)
0316 {
0317     sas_remove_children(&shost->shost_gendev);
0318     scsi_remove_host(shost);
0319 }
0320 EXPORT_SYMBOL(sas_remove_host);
0321 
0322 /**
0323  * sas_get_address - return the SAS address of the device
0324  * @sdev: scsi device
0325  *
0326  * Returns the SAS address of the scsi device
0327  */
0328 u64 sas_get_address(struct scsi_device *sdev)
0329 {
0330     struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
0331 
0332     return rdev->rphy.identify.sas_address;
0333 }
0334 EXPORT_SYMBOL(sas_get_address);
0335 
0336 /**
0337  * sas_tlr_supported - checking TLR bit in vpd 0x90
0338  * @sdev: scsi device struct
0339  *
0340  * Check Transport Layer Retries are supported or not.
0341  * If vpd page 0x90 is present, TRL is supported.
0342  *
0343  */
0344 unsigned int
0345 sas_tlr_supported(struct scsi_device *sdev)
0346 {
0347     const int vpd_len = 32;
0348     struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
0349     char *buffer = kzalloc(vpd_len, GFP_KERNEL);
0350     int ret = 0;
0351 
0352     if (!buffer)
0353         goto out;
0354 
0355     if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
0356         goto out;
0357 
0358     /*
0359      * Magic numbers: the VPD Protocol page (0x90)
0360      * has a 4 byte header and then one entry per device port
0361      * the TLR bit is at offset 8 on each port entry
0362      * if we take the first port, that's at total offset 12
0363      */
0364     ret = buffer[12] & 0x01;
0365 
0366  out:
0367     kfree(buffer);
0368     rdev->tlr_supported = ret;
0369     return ret;
0370 
0371 }
0372 EXPORT_SYMBOL_GPL(sas_tlr_supported);
0373 
0374 /**
0375  * sas_disable_tlr - setting TLR flags
0376  * @sdev: scsi device struct
0377  *
0378  * Seting tlr_enabled flag to 0.
0379  *
0380  */
0381 void
0382 sas_disable_tlr(struct scsi_device *sdev)
0383 {
0384     struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
0385 
0386     rdev->tlr_enabled = 0;
0387 }
0388 EXPORT_SYMBOL_GPL(sas_disable_tlr);
0389 
0390 /**
0391  * sas_enable_tlr - setting TLR flags
0392  * @sdev: scsi device struct
0393  *
0394  * Seting tlr_enabled flag 1.
0395  *
0396  */
0397 void sas_enable_tlr(struct scsi_device *sdev)
0398 {
0399     unsigned int tlr_supported = 0;
0400     tlr_supported  = sas_tlr_supported(sdev);
0401 
0402     if (tlr_supported) {
0403         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
0404 
0405         rdev->tlr_enabled = 1;
0406     }
0407 
0408     return;
0409 }
0410 EXPORT_SYMBOL_GPL(sas_enable_tlr);
0411 
0412 unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
0413 {
0414     struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
0415     return rdev->tlr_enabled;
0416 }
0417 EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
0418 
0419 /*
0420  * SAS Phy attributes
0421  */
0422 
0423 #define sas_phy_show_simple(field, name, format_string, cast)       \
0424 static ssize_t                              \
0425 show_sas_phy_##name(struct device *dev,                 \
0426             struct device_attribute *attr, char *buf)       \
0427 {                                   \
0428     struct sas_phy *phy = transport_class_to_phy(dev);      \
0429                                     \
0430     return snprintf(buf, 20, format_string, cast phy->field);   \
0431 }
0432 
0433 #define sas_phy_simple_attr(field, name, format_string, type)       \
0434     sas_phy_show_simple(field, name, format_string, (type)) \
0435 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
0436 
0437 #define sas_phy_show_protocol(field, name)              \
0438 static ssize_t                              \
0439 show_sas_phy_##name(struct device *dev,                 \
0440             struct device_attribute *attr, char *buf)       \
0441 {                                   \
0442     struct sas_phy *phy = transport_class_to_phy(dev);      \
0443                                     \
0444     if (!phy->field)                        \
0445         return snprintf(buf, 20, "none\n");         \
0446     return get_sas_protocol_names(phy->field, buf);     \
0447 }
0448 
0449 #define sas_phy_protocol_attr(field, name)              \
0450     sas_phy_show_protocol(field, name)              \
0451 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
0452 
0453 #define sas_phy_show_linkspeed(field)                   \
0454 static ssize_t                              \
0455 show_sas_phy_##field(struct device *dev,                \
0456              struct device_attribute *attr, char *buf)      \
0457 {                                   \
0458     struct sas_phy *phy = transport_class_to_phy(dev);      \
0459                                     \
0460     return get_sas_linkspeed_names(phy->field, buf);        \
0461 }
0462 
0463 /* Fudge to tell if we're minimum or maximum */
0464 #define sas_phy_store_linkspeed(field)                  \
0465 static ssize_t                              \
0466 store_sas_phy_##field(struct device *dev,               \
0467               struct device_attribute *attr,            \
0468               const char *buf,  size_t count)           \
0469 {                                   \
0470     struct sas_phy *phy = transport_class_to_phy(dev);      \
0471     struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);    \
0472     struct sas_internal *i = to_sas_internal(shost->transportt);    \
0473     u32 value;                          \
0474     struct sas_phy_linkrates rates = {0};               \
0475     int error;                          \
0476                                     \
0477     error = set_sas_linkspeed_names(&value, buf);           \
0478     if (error)                          \
0479         return error;                       \
0480     rates.field = value;                        \
0481     error = i->f->set_phy_speed(phy, &rates);           \
0482                                     \
0483     return error ? error : count;                   \
0484 }
0485 
0486 #define sas_phy_linkspeed_rw_attr(field)                \
0487     sas_phy_show_linkspeed(field)                   \
0488     sas_phy_store_linkspeed(field)                  \
0489 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,        \
0490     store_sas_phy_##field)
0491 
0492 #define sas_phy_linkspeed_attr(field)                   \
0493     sas_phy_show_linkspeed(field)                   \
0494 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
0495 
0496 
0497 #define sas_phy_show_linkerror(field)                   \
0498 static ssize_t                              \
0499 show_sas_phy_##field(struct device *dev,                \
0500              struct device_attribute *attr, char *buf)      \
0501 {                                   \
0502     struct sas_phy *phy = transport_class_to_phy(dev);      \
0503     struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);    \
0504     struct sas_internal *i = to_sas_internal(shost->transportt);    \
0505     int error;                          \
0506                                     \
0507     error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;   \
0508     if (error)                          \
0509         return error;                       \
0510     return snprintf(buf, 20, "%u\n", phy->field);           \
0511 }
0512 
0513 #define sas_phy_linkerror_attr(field)                   \
0514     sas_phy_show_linkerror(field)                   \
0515 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
0516 
0517 
0518 static ssize_t
0519 show_sas_device_type(struct device *dev,
0520              struct device_attribute *attr, char *buf)
0521 {
0522     struct sas_phy *phy = transport_class_to_phy(dev);
0523 
0524     if (!phy->identify.device_type)
0525         return snprintf(buf, 20, "none\n");
0526     return get_sas_device_type_names(phy->identify.device_type, buf);
0527 }
0528 static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
0529 
0530 static ssize_t do_sas_phy_enable(struct device *dev,
0531         size_t count, int enable)
0532 {
0533     struct sas_phy *phy = transport_class_to_phy(dev);
0534     struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
0535     struct sas_internal *i = to_sas_internal(shost->transportt);
0536     int error;
0537 
0538     error = i->f->phy_enable(phy, enable);
0539     if (error)
0540         return error;
0541     phy->enabled = enable;
0542     return count;
0543 };
0544 
0545 static ssize_t
0546 store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
0547              const char *buf, size_t count)
0548 {
0549     if (count < 1)
0550         return -EINVAL;
0551 
0552     switch (buf[0]) {
0553     case '0':
0554         do_sas_phy_enable(dev, count, 0);
0555         break;
0556     case '1':
0557         do_sas_phy_enable(dev, count, 1);
0558         break;
0559     default:
0560         return -EINVAL;
0561     }
0562 
0563     return count;
0564 }
0565 
0566 static ssize_t
0567 show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
0568             char *buf)
0569 {
0570     struct sas_phy *phy = transport_class_to_phy(dev);
0571 
0572     return snprintf(buf, 20, "%d\n", phy->enabled);
0573 }
0574 
0575 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
0576              store_sas_phy_enable);
0577 
0578 static ssize_t
0579 do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
0580 {
0581     struct sas_phy *phy = transport_class_to_phy(dev);
0582     struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
0583     struct sas_internal *i = to_sas_internal(shost->transportt);
0584     int error;
0585 
0586     error = i->f->phy_reset(phy, hard_reset);
0587     if (error)
0588         return error;
0589     phy->enabled = 1;
0590     return count;
0591 };
0592 
0593 static ssize_t
0594 store_sas_link_reset(struct device *dev, struct device_attribute *attr,
0595              const char *buf, size_t count)
0596 {
0597     return do_sas_phy_reset(dev, count, 0);
0598 }
0599 static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
0600 
0601 static ssize_t
0602 store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
0603              const char *buf, size_t count)
0604 {
0605     return do_sas_phy_reset(dev, count, 1);
0606 }
0607 static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
0608 
0609 sas_phy_protocol_attr(identify.initiator_port_protocols,
0610         initiator_port_protocols);
0611 sas_phy_protocol_attr(identify.target_port_protocols,
0612         target_port_protocols);
0613 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
0614         unsigned long long);
0615 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
0616 sas_phy_linkspeed_attr(negotiated_linkrate);
0617 sas_phy_linkspeed_attr(minimum_linkrate_hw);
0618 sas_phy_linkspeed_rw_attr(minimum_linkrate);
0619 sas_phy_linkspeed_attr(maximum_linkrate_hw);
0620 sas_phy_linkspeed_rw_attr(maximum_linkrate);
0621 sas_phy_linkerror_attr(invalid_dword_count);
0622 sas_phy_linkerror_attr(running_disparity_error_count);
0623 sas_phy_linkerror_attr(loss_of_dword_sync_count);
0624 sas_phy_linkerror_attr(phy_reset_problem_count);
0625 
0626 static int sas_phy_setup(struct transport_container *tc, struct device *dev,
0627              struct device *cdev)
0628 {
0629     struct sas_phy *phy = dev_to_phy(dev);
0630     struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
0631     struct sas_internal *i = to_sas_internal(shost->transportt);
0632 
0633     if (i->f->phy_setup)
0634         i->f->phy_setup(phy);
0635 
0636     return 0;
0637 }
0638 
0639 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
0640         "sas_phy", sas_phy_setup, NULL, NULL);
0641 
0642 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
0643 {
0644     struct Scsi_Host *shost;
0645     struct sas_internal *i;
0646 
0647     if (!scsi_is_sas_phy(dev))
0648         return 0;
0649     shost = dev_to_shost(dev->parent);
0650 
0651     if (!shost->transportt)
0652         return 0;
0653     if (shost->transportt->host_attrs.ac.class !=
0654             &sas_host_class.class)
0655         return 0;
0656 
0657     i = to_sas_internal(shost->transportt);
0658     return &i->phy_attr_cont.ac == cont;
0659 }
0660 
0661 static void sas_phy_release(struct device *dev)
0662 {
0663     struct sas_phy *phy = dev_to_phy(dev);
0664     struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
0665     struct sas_internal *i = to_sas_internal(shost->transportt);
0666 
0667     if (i->f->phy_release)
0668         i->f->phy_release(phy);
0669     put_device(dev->parent);
0670     kfree(phy);
0671 }
0672 
0673 /**
0674  * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
0675  * @parent: Parent device
0676  * @number: Phy index
0677  *
0678  * Allocates an SAS PHY structure.  It will be added in the device tree
0679  * below the device specified by @parent, which has to be either a Scsi_Host
0680  * or sas_rphy.
0681  *
0682  * Returns:
0683  *  SAS PHY allocated or %NULL if the allocation failed.
0684  */
0685 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
0686 {
0687     struct Scsi_Host *shost = dev_to_shost(parent);
0688     struct sas_phy *phy;
0689 
0690     phy = kzalloc(sizeof(*phy), GFP_KERNEL);
0691     if (!phy)
0692         return NULL;
0693 
0694     phy->number = number;
0695     phy->enabled = 1;
0696 
0697     device_initialize(&phy->dev);
0698     phy->dev.parent = get_device(parent);
0699     phy->dev.release = sas_phy_release;
0700     INIT_LIST_HEAD(&phy->port_siblings);
0701     if (scsi_is_sas_expander_device(parent)) {
0702         struct sas_rphy *rphy = dev_to_rphy(parent);
0703         dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
0704             rphy->scsi_target_id, number);
0705     } else
0706         dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
0707 
0708     transport_setup_device(&phy->dev);
0709 
0710     return phy;
0711 }
0712 EXPORT_SYMBOL(sas_phy_alloc);
0713 
0714 /**
0715  * sas_phy_add  -  add a SAS PHY to the device hierarchy
0716  * @phy:    The PHY to be added
0717  *
0718  * Publishes a SAS PHY to the rest of the system.
0719  */
0720 int sas_phy_add(struct sas_phy *phy)
0721 {
0722     int error;
0723 
0724     error = device_add(&phy->dev);
0725     if (!error) {
0726         transport_add_device(&phy->dev);
0727         transport_configure_device(&phy->dev);
0728     }
0729 
0730     return error;
0731 }
0732 EXPORT_SYMBOL(sas_phy_add);
0733 
0734 /**
0735  * sas_phy_free  -  free a SAS PHY
0736  * @phy:    SAS PHY to free
0737  *
0738  * Frees the specified SAS PHY.
0739  *
0740  * Note:
0741  *   This function must only be called on a PHY that has not
0742  *   successfully been added using sas_phy_add().
0743  */
0744 void sas_phy_free(struct sas_phy *phy)
0745 {
0746     transport_destroy_device(&phy->dev);
0747     put_device(&phy->dev);
0748 }
0749 EXPORT_SYMBOL(sas_phy_free);
0750 
0751 /**
0752  * sas_phy_delete  -  remove SAS PHY
0753  * @phy:    SAS PHY to remove
0754  *
0755  * Removes the specified SAS PHY.  If the SAS PHY has an
0756  * associated remote PHY it is removed before.
0757  */
0758 void
0759 sas_phy_delete(struct sas_phy *phy)
0760 {
0761     struct device *dev = &phy->dev;
0762 
0763     /* this happens if the phy is still part of a port when deleted */
0764     BUG_ON(!list_empty(&phy->port_siblings));
0765 
0766     transport_remove_device(dev);
0767     device_del(dev);
0768     transport_destroy_device(dev);
0769     put_device(dev);
0770 }
0771 EXPORT_SYMBOL(sas_phy_delete);
0772 
0773 /**
0774  * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
0775  * @dev:    device to check
0776  *
0777  * Returns:
0778  *  %1 if the device represents a SAS PHY, %0 else
0779  */
0780 int scsi_is_sas_phy(const struct device *dev)
0781 {
0782     return dev->release == sas_phy_release;
0783 }
0784 EXPORT_SYMBOL(scsi_is_sas_phy);
0785 
0786 /*
0787  * SAS Port attributes
0788  */
0789 #define sas_port_show_simple(field, name, format_string, cast)      \
0790 static ssize_t                              \
0791 show_sas_port_##name(struct device *dev,                \
0792              struct device_attribute *attr, char *buf)      \
0793 {                                   \
0794     struct sas_port *port = transport_class_to_sas_port(dev);   \
0795                                     \
0796     return snprintf(buf, 20, format_string, cast port->field);  \
0797 }
0798 
0799 #define sas_port_simple_attr(field, name, format_string, type)      \
0800     sas_port_show_simple(field, name, format_string, (type))    \
0801 static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
0802 
0803 sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
0804 
0805 static DECLARE_TRANSPORT_CLASS(sas_port_class,
0806                    "sas_port", NULL, NULL, NULL);
0807 
0808 static int sas_port_match(struct attribute_container *cont, struct device *dev)
0809 {
0810     struct Scsi_Host *shost;
0811     struct sas_internal *i;
0812 
0813     if (!scsi_is_sas_port(dev))
0814         return 0;
0815     shost = dev_to_shost(dev->parent);
0816 
0817     if (!shost->transportt)
0818         return 0;
0819     if (shost->transportt->host_attrs.ac.class !=
0820             &sas_host_class.class)
0821         return 0;
0822 
0823     i = to_sas_internal(shost->transportt);
0824     return &i->port_attr_cont.ac == cont;
0825 }
0826 
0827 
0828 static void sas_port_release(struct device *dev)
0829 {
0830     struct sas_port *port = dev_to_sas_port(dev);
0831 
0832     BUG_ON(!list_empty(&port->phy_list));
0833 
0834     put_device(dev->parent);
0835     kfree(port);
0836 }
0837 
0838 static void sas_port_create_link(struct sas_port *port,
0839                  struct sas_phy *phy)
0840 {
0841     int res;
0842 
0843     res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
0844                 dev_name(&phy->dev));
0845     if (res)
0846         goto err;
0847     res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
0848     if (res)
0849         goto err;
0850     return;
0851 err:
0852     printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
0853            __func__, res);
0854 }
0855 
0856 static void sas_port_delete_link(struct sas_port *port,
0857                  struct sas_phy *phy)
0858 {
0859     sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
0860     sysfs_remove_link(&phy->dev.kobj, "port");
0861 }
0862 
0863 /** sas_port_alloc - allocate and initialize a SAS port structure
0864  *
0865  * @parent: parent device
0866  * @port_id:    port number
0867  *
0868  * Allocates a SAS port structure.  It will be added to the device tree
0869  * below the device specified by @parent which must be either a Scsi_Host
0870  * or a sas_expander_device.
0871  *
0872  * Returns %NULL on error
0873  */
0874 struct sas_port *sas_port_alloc(struct device *parent, int port_id)
0875 {
0876     struct Scsi_Host *shost = dev_to_shost(parent);
0877     struct sas_port *port;
0878 
0879     port = kzalloc(sizeof(*port), GFP_KERNEL);
0880     if (!port)
0881         return NULL;
0882 
0883     port->port_identifier = port_id;
0884 
0885     device_initialize(&port->dev);
0886 
0887     port->dev.parent = get_device(parent);
0888     port->dev.release = sas_port_release;
0889 
0890     mutex_init(&port->phy_list_mutex);
0891     INIT_LIST_HEAD(&port->phy_list);
0892 
0893     if (scsi_is_sas_expander_device(parent)) {
0894         struct sas_rphy *rphy = dev_to_rphy(parent);
0895         dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
0896                  rphy->scsi_target_id, port->port_identifier);
0897     } else
0898         dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
0899                  port->port_identifier);
0900 
0901     transport_setup_device(&port->dev);
0902 
0903     return port;
0904 }
0905 EXPORT_SYMBOL(sas_port_alloc);
0906 
0907 /** sas_port_alloc_num - allocate and initialize a SAS port structure
0908  *
0909  * @parent: parent device
0910  *
0911  * Allocates a SAS port structure and a number to go with it.  This
0912  * interface is really for adapters where the port number has no
0913  * meansing, so the sas class should manage them.  It will be added to
0914  * the device tree below the device specified by @parent which must be
0915  * either a Scsi_Host or a sas_expander_device.
0916  *
0917  * Returns %NULL on error
0918  */
0919 struct sas_port *sas_port_alloc_num(struct device *parent)
0920 {
0921     int index;
0922     struct Scsi_Host *shost = dev_to_shost(parent);
0923     struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
0924 
0925     /* FIXME: use idr for this eventually */
0926     mutex_lock(&sas_host->lock);
0927     if (scsi_is_sas_expander_device(parent)) {
0928         struct sas_rphy *rphy = dev_to_rphy(parent);
0929         struct sas_expander_device *exp = rphy_to_expander_device(rphy);
0930 
0931         index = exp->next_port_id++;
0932     } else
0933         index = sas_host->next_port_id++;
0934     mutex_unlock(&sas_host->lock);
0935     return sas_port_alloc(parent, index);
0936 }
0937 EXPORT_SYMBOL(sas_port_alloc_num);
0938 
0939 /**
0940  * sas_port_add - add a SAS port to the device hierarchy
0941  * @port:   port to be added
0942  *
0943  * publishes a port to the rest of the system
0944  */
0945 int sas_port_add(struct sas_port *port)
0946 {
0947     int error;
0948 
0949     /* No phys should be added until this is made visible */
0950     BUG_ON(!list_empty(&port->phy_list));
0951 
0952     error = device_add(&port->dev);
0953 
0954     if (error)
0955         return error;
0956 
0957     transport_add_device(&port->dev);
0958     transport_configure_device(&port->dev);
0959 
0960     return 0;
0961 }
0962 EXPORT_SYMBOL(sas_port_add);
0963 
0964 /**
0965  * sas_port_free  -  free a SAS PORT
0966  * @port:   SAS PORT to free
0967  *
0968  * Frees the specified SAS PORT.
0969  *
0970  * Note:
0971  *   This function must only be called on a PORT that has not
0972  *   successfully been added using sas_port_add().
0973  */
0974 void sas_port_free(struct sas_port *port)
0975 {
0976     transport_destroy_device(&port->dev);
0977     put_device(&port->dev);
0978 }
0979 EXPORT_SYMBOL(sas_port_free);
0980 
0981 /**
0982  * sas_port_delete  -  remove SAS PORT
0983  * @port:   SAS PORT to remove
0984  *
0985  * Removes the specified SAS PORT.  If the SAS PORT has an
0986  * associated phys, unlink them from the port as well.
0987  */
0988 void sas_port_delete(struct sas_port *port)
0989 {
0990     struct device *dev = &port->dev;
0991     struct sas_phy *phy, *tmp_phy;
0992 
0993     if (port->rphy) {
0994         sas_rphy_delete(port->rphy);
0995         port->rphy = NULL;
0996     }
0997 
0998     mutex_lock(&port->phy_list_mutex);
0999     list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
1000                  port_siblings) {
1001         sas_port_delete_link(port, phy);
1002         list_del_init(&phy->port_siblings);
1003     }
1004     mutex_unlock(&port->phy_list_mutex);
1005 
1006     if (port->is_backlink) {
1007         struct device *parent = port->dev.parent;
1008 
1009         sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1010         port->is_backlink = 0;
1011     }
1012 
1013     transport_remove_device(dev);
1014     device_del(dev);
1015     transport_destroy_device(dev);
1016     put_device(dev);
1017 }
1018 EXPORT_SYMBOL(sas_port_delete);
1019 
1020 /**
1021  * scsi_is_sas_port -  check if a struct device represents a SAS port
1022  * @dev:    device to check
1023  *
1024  * Returns:
1025  *  %1 if the device represents a SAS Port, %0 else
1026  */
1027 int scsi_is_sas_port(const struct device *dev)
1028 {
1029     return dev->release == sas_port_release;
1030 }
1031 EXPORT_SYMBOL(scsi_is_sas_port);
1032 
1033 /**
1034  * sas_port_get_phy - try to take a reference on a port member
1035  * @port: port to check
1036  */
1037 struct sas_phy *sas_port_get_phy(struct sas_port *port)
1038 {
1039     struct sas_phy *phy;
1040 
1041     mutex_lock(&port->phy_list_mutex);
1042     if (list_empty(&port->phy_list))
1043         phy = NULL;
1044     else {
1045         struct list_head *ent = port->phy_list.next;
1046 
1047         phy = list_entry(ent, typeof(*phy), port_siblings);
1048         get_device(&phy->dev);
1049     }
1050     mutex_unlock(&port->phy_list_mutex);
1051 
1052     return phy;
1053 }
1054 EXPORT_SYMBOL(sas_port_get_phy);
1055 
1056 /**
1057  * sas_port_add_phy - add another phy to a port to form a wide port
1058  * @port:   port to add the phy to
1059  * @phy:    phy to add
1060  *
1061  * When a port is initially created, it is empty (has no phys).  All
1062  * ports must have at least one phy to operated, and all wide ports
1063  * must have at least two.  The current code makes no difference
1064  * between ports and wide ports, but the only object that can be
1065  * connected to a remote device is a port, so ports must be formed on
1066  * all devices with phys if they're connected to anything.
1067  */
1068 void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1069 {
1070     mutex_lock(&port->phy_list_mutex);
1071     if (unlikely(!list_empty(&phy->port_siblings))) {
1072         /* make sure we're already on this port */
1073         struct sas_phy *tmp;
1074 
1075         list_for_each_entry(tmp, &port->phy_list, port_siblings)
1076             if (tmp == phy)
1077                 break;
1078         /* If this trips, you added a phy that was already
1079          * part of a different port */
1080         if (unlikely(tmp != phy)) {
1081             dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1082                    dev_name(&phy->dev));
1083             BUG();
1084         }
1085     } else {
1086         sas_port_create_link(port, phy);
1087         list_add_tail(&phy->port_siblings, &port->phy_list);
1088         port->num_phys++;
1089     }
1090     mutex_unlock(&port->phy_list_mutex);
1091 }
1092 EXPORT_SYMBOL(sas_port_add_phy);
1093 
1094 /**
1095  * sas_port_delete_phy - remove a phy from a port or wide port
1096  * @port:   port to remove the phy from
1097  * @phy:    phy to remove
1098  *
1099  * This operation is used for tearing down ports again.  It must be
1100  * done to every port or wide port before calling sas_port_delete.
1101  */
1102 void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1103 {
1104     mutex_lock(&port->phy_list_mutex);
1105     sas_port_delete_link(port, phy);
1106     list_del_init(&phy->port_siblings);
1107     port->num_phys--;
1108     mutex_unlock(&port->phy_list_mutex);
1109 }
1110 EXPORT_SYMBOL(sas_port_delete_phy);
1111 
1112 void sas_port_mark_backlink(struct sas_port *port)
1113 {
1114     int res;
1115     struct device *parent = port->dev.parent->parent->parent;
1116 
1117     if (port->is_backlink)
1118         return;
1119     port->is_backlink = 1;
1120     res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1121                 dev_name(parent));
1122     if (res)
1123         goto err;
1124     return;
1125 err:
1126     printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1127            __func__, res);
1128 
1129 }
1130 EXPORT_SYMBOL(sas_port_mark_backlink);
1131 
1132 /*
1133  * SAS remote PHY attributes.
1134  */
1135 
1136 #define sas_rphy_show_simple(field, name, format_string, cast)      \
1137 static ssize_t                              \
1138 show_sas_rphy_##name(struct device *dev,                \
1139              struct device_attribute *attr, char *buf)      \
1140 {                                   \
1141     struct sas_rphy *rphy = transport_class_to_rphy(dev);       \
1142                                     \
1143     return snprintf(buf, 20, format_string, cast rphy->field);  \
1144 }
1145 
1146 #define sas_rphy_simple_attr(field, name, format_string, type)      \
1147     sas_rphy_show_simple(field, name, format_string, (type))    \
1148 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,             \
1149         show_sas_rphy_##name, NULL)
1150 
1151 #define sas_rphy_show_protocol(field, name)             \
1152 static ssize_t                              \
1153 show_sas_rphy_##name(struct device *dev,                \
1154              struct device_attribute *attr, char *buf)      \
1155 {                                   \
1156     struct sas_rphy *rphy = transport_class_to_rphy(dev);       \
1157                                     \
1158     if (!rphy->field)                   \
1159         return snprintf(buf, 20, "none\n");         \
1160     return get_sas_protocol_names(rphy->field, buf);    \
1161 }
1162 
1163 #define sas_rphy_protocol_attr(field, name)             \
1164     sas_rphy_show_protocol(field, name)             \
1165 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,         \
1166         show_sas_rphy_##name, NULL)
1167 
1168 static ssize_t
1169 show_sas_rphy_device_type(struct device *dev,
1170               struct device_attribute *attr, char *buf)
1171 {
1172     struct sas_rphy *rphy = transport_class_to_rphy(dev);
1173 
1174     if (!rphy->identify.device_type)
1175         return snprintf(buf, 20, "none\n");
1176     return get_sas_device_type_names(
1177             rphy->identify.device_type, buf);
1178 }
1179 
1180 static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1181         show_sas_rphy_device_type, NULL);
1182 
1183 static ssize_t
1184 show_sas_rphy_enclosure_identifier(struct device *dev,
1185                    struct device_attribute *attr, char *buf)
1186 {
1187     struct sas_rphy *rphy = transport_class_to_rphy(dev);
1188     struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1189     struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1190     struct sas_internal *i = to_sas_internal(shost->transportt);
1191     u64 identifier;
1192     int error;
1193 
1194     error = i->f->get_enclosure_identifier(rphy, &identifier);
1195     if (error)
1196         return error;
1197     return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1198 }
1199 
1200 static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1201         show_sas_rphy_enclosure_identifier, NULL);
1202 
1203 static ssize_t
1204 show_sas_rphy_bay_identifier(struct device *dev,
1205                  struct device_attribute *attr, char *buf)
1206 {
1207     struct sas_rphy *rphy = transport_class_to_rphy(dev);
1208     struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1209     struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1210     struct sas_internal *i = to_sas_internal(shost->transportt);
1211     int val;
1212 
1213     val = i->f->get_bay_identifier(rphy);
1214     if (val < 0)
1215         return val;
1216     return sprintf(buf, "%d\n", val);
1217 }
1218 
1219 static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1220         show_sas_rphy_bay_identifier, NULL);
1221 
1222 sas_rphy_protocol_attr(identify.initiator_port_protocols,
1223         initiator_port_protocols);
1224 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1225 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1226         unsigned long long);
1227 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1228 sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
1229 
1230 /* only need 8 bytes of data plus header (4 or 8) */
1231 #define BUF_SIZE 64
1232 
1233 int sas_read_port_mode_page(struct scsi_device *sdev)
1234 {
1235     char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1236     struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1237     struct scsi_mode_data mode_data;
1238     int error;
1239 
1240     if (!buffer)
1241         return -ENOMEM;
1242 
1243     error = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
1244                 &mode_data, NULL);
1245 
1246     if (error)
1247         goto out;
1248 
1249     msdata = buffer +  mode_data.header_length +
1250         mode_data.block_descriptor_length;
1251 
1252     if (msdata - buffer > BUF_SIZE - 8)
1253         goto out;
1254 
1255     error = 0;
1256 
1257     rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1258     rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1259     rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1260 
1261  out:
1262     kfree(buffer);
1263     return error;
1264 }
1265 EXPORT_SYMBOL(sas_read_port_mode_page);
1266 
1267 static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1268                    "sas_end_device", NULL, NULL, NULL);
1269 
1270 #define sas_end_dev_show_simple(field, name, format_string, cast)   \
1271 static ssize_t                              \
1272 show_sas_end_dev_##name(struct device *dev,                 \
1273             struct device_attribute *attr, char *buf)   \
1274 {                                   \
1275     struct sas_rphy *rphy = transport_class_to_rphy(dev);       \
1276     struct sas_end_device *rdev = rphy_to_end_device(rphy);     \
1277                                     \
1278     return snprintf(buf, 20, format_string, cast rdev->field);  \
1279 }
1280 
1281 #define sas_end_dev_simple_attr(field, name, format_string, type)   \
1282     sas_end_dev_show_simple(field, name, format_string, (type)) \
1283 static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO,          \
1284         show_sas_end_dev_##name, NULL)
1285 
1286 sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1287 sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1288             "%d\n", int);
1289 sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1290             "%d\n", int);
1291 sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1292             "%d\n", int);
1293 sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1294             "%d\n", int);
1295 
1296 static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1297                    "sas_expander", NULL, NULL, NULL);
1298 
1299 #define sas_expander_show_simple(field, name, format_string, cast)  \
1300 static ssize_t                              \
1301 show_sas_expander_##name(struct device *dev,                \
1302              struct device_attribute *attr, char *buf)  \
1303 {                                   \
1304     struct sas_rphy *rphy = transport_class_to_rphy(dev);       \
1305     struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1306                                     \
1307     return snprintf(buf, 20, format_string, cast edev->field);  \
1308 }
1309 
1310 #define sas_expander_simple_attr(field, name, format_string, type)  \
1311     sas_expander_show_simple(field, name, format_string, (type))    \
1312 static SAS_DEVICE_ATTR(expander, name, S_IRUGO,             \
1313         show_sas_expander_##name, NULL)
1314 
1315 sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1316 sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1317 sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1318 sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1319              "%s\n", char *);
1320 sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1321 sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1322              unsigned int);
1323 sas_expander_simple_attr(level, level, "%d\n", int);
1324 
1325 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1326         "sas_device", NULL, NULL, NULL);
1327 
1328 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1329 {
1330     struct Scsi_Host *shost;
1331     struct sas_internal *i;
1332 
1333     if (!scsi_is_sas_rphy(dev))
1334         return 0;
1335     shost = dev_to_shost(dev->parent->parent);
1336 
1337     if (!shost->transportt)
1338         return 0;
1339     if (shost->transportt->host_attrs.ac.class !=
1340             &sas_host_class.class)
1341         return 0;
1342 
1343     i = to_sas_internal(shost->transportt);
1344     return &i->rphy_attr_cont.ac == cont;
1345 }
1346 
1347 static int sas_end_dev_match(struct attribute_container *cont,
1348                  struct device *dev)
1349 {
1350     struct Scsi_Host *shost;
1351     struct sas_internal *i;
1352     struct sas_rphy *rphy;
1353 
1354     if (!scsi_is_sas_rphy(dev))
1355         return 0;
1356     shost = dev_to_shost(dev->parent->parent);
1357     rphy = dev_to_rphy(dev);
1358 
1359     if (!shost->transportt)
1360         return 0;
1361     if (shost->transportt->host_attrs.ac.class !=
1362             &sas_host_class.class)
1363         return 0;
1364 
1365     i = to_sas_internal(shost->transportt);
1366     return &i->end_dev_attr_cont.ac == cont &&
1367         rphy->identify.device_type == SAS_END_DEVICE;
1368 }
1369 
1370 static int sas_expander_match(struct attribute_container *cont,
1371                   struct device *dev)
1372 {
1373     struct Scsi_Host *shost;
1374     struct sas_internal *i;
1375     struct sas_rphy *rphy;
1376 
1377     if (!scsi_is_sas_rphy(dev))
1378         return 0;
1379     shost = dev_to_shost(dev->parent->parent);
1380     rphy = dev_to_rphy(dev);
1381 
1382     if (!shost->transportt)
1383         return 0;
1384     if (shost->transportt->host_attrs.ac.class !=
1385             &sas_host_class.class)
1386         return 0;
1387 
1388     i = to_sas_internal(shost->transportt);
1389     return &i->expander_attr_cont.ac == cont &&
1390         (rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1391          rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1392 }
1393 
1394 static void sas_expander_release(struct device *dev)
1395 {
1396     struct sas_rphy *rphy = dev_to_rphy(dev);
1397     struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1398 
1399     put_device(dev->parent);
1400     kfree(edev);
1401 }
1402 
1403 static void sas_end_device_release(struct device *dev)
1404 {
1405     struct sas_rphy *rphy = dev_to_rphy(dev);
1406     struct sas_end_device *edev = rphy_to_end_device(rphy);
1407 
1408     put_device(dev->parent);
1409     kfree(edev);
1410 }
1411 
1412 /**
1413  * sas_rphy_initialize - common rphy initialization
1414  * @rphy:   rphy to initialise
1415  *
1416  * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1417  * initialise the common rphy component of each.
1418  */
1419 static void sas_rphy_initialize(struct sas_rphy *rphy)
1420 {
1421     INIT_LIST_HEAD(&rphy->list);
1422 }
1423 
1424 /**
1425  * sas_end_device_alloc - allocate an rphy for an end device
1426  * @parent: which port
1427  *
1428  * Allocates an SAS remote PHY structure, connected to @parent.
1429  *
1430  * Returns:
1431  *  SAS PHY allocated or %NULL if the allocation failed.
1432  */
1433 struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1434 {
1435     struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1436     struct sas_end_device *rdev;
1437 
1438     rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1439     if (!rdev) {
1440         return NULL;
1441     }
1442 
1443     device_initialize(&rdev->rphy.dev);
1444     rdev->rphy.dev.parent = get_device(&parent->dev);
1445     rdev->rphy.dev.release = sas_end_device_release;
1446     if (scsi_is_sas_expander_device(parent->dev.parent)) {
1447         struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1448         dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1449                  shost->host_no, rphy->scsi_target_id,
1450                  parent->port_identifier);
1451     } else
1452         dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1453                  shost->host_no, parent->port_identifier);
1454     rdev->rphy.identify.device_type = SAS_END_DEVICE;
1455     sas_rphy_initialize(&rdev->rphy);
1456     transport_setup_device(&rdev->rphy.dev);
1457 
1458     return &rdev->rphy;
1459 }
1460 EXPORT_SYMBOL(sas_end_device_alloc);
1461 
1462 /**
1463  * sas_expander_alloc - allocate an rphy for an end device
1464  * @parent: which port
1465  * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1466  *
1467  * Allocates an SAS remote PHY structure, connected to @parent.
1468  *
1469  * Returns:
1470  *  SAS PHY allocated or %NULL if the allocation failed.
1471  */
1472 struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1473                     enum sas_device_type type)
1474 {
1475     struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1476     struct sas_expander_device *rdev;
1477     struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1478 
1479     BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1480            type != SAS_FANOUT_EXPANDER_DEVICE);
1481 
1482     rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1483     if (!rdev) {
1484         return NULL;
1485     }
1486 
1487     device_initialize(&rdev->rphy.dev);
1488     rdev->rphy.dev.parent = get_device(&parent->dev);
1489     rdev->rphy.dev.release = sas_expander_release;
1490     mutex_lock(&sas_host->lock);
1491     rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1492     mutex_unlock(&sas_host->lock);
1493     dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1494              shost->host_no, rdev->rphy.scsi_target_id);
1495     rdev->rphy.identify.device_type = type;
1496     sas_rphy_initialize(&rdev->rphy);
1497     transport_setup_device(&rdev->rphy.dev);
1498 
1499     return &rdev->rphy;
1500 }
1501 EXPORT_SYMBOL(sas_expander_alloc);
1502 
1503 /**
1504  * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
1505  * @rphy:   The remote PHY to be added
1506  *
1507  * Publishes a SAS remote PHY to the rest of the system.
1508  */
1509 int sas_rphy_add(struct sas_rphy *rphy)
1510 {
1511     struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1512     struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1513     struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1514     struct sas_identify *identify = &rphy->identify;
1515     int error;
1516 
1517     if (parent->rphy)
1518         return -ENXIO;
1519     parent->rphy = rphy;
1520 
1521     error = device_add(&rphy->dev);
1522     if (error)
1523         return error;
1524     transport_add_device(&rphy->dev);
1525     transport_configure_device(&rphy->dev);
1526     if (sas_bsg_initialize(shost, rphy))
1527         printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1528 
1529 
1530     mutex_lock(&sas_host->lock);
1531     list_add_tail(&rphy->list, &sas_host->rphy_list);
1532     if (identify->device_type == SAS_END_DEVICE &&
1533         (identify->target_port_protocols &
1534          (SAS_PROTOCOL_SSP | SAS_PROTOCOL_STP | SAS_PROTOCOL_SATA)))
1535         rphy->scsi_target_id = sas_host->next_target_id++;
1536     else if (identify->device_type == SAS_END_DEVICE)
1537         rphy->scsi_target_id = -1;
1538     mutex_unlock(&sas_host->lock);
1539 
1540     if (identify->device_type == SAS_END_DEVICE &&
1541         rphy->scsi_target_id != -1) {
1542         int lun;
1543 
1544         if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1545             lun = SCAN_WILD_CARD;
1546         else
1547             lun = 0;
1548 
1549         scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
1550                  SCSI_SCAN_INITIAL);
1551     }
1552 
1553     return 0;
1554 }
1555 EXPORT_SYMBOL(sas_rphy_add);
1556 
1557 /**
1558  * sas_rphy_free  -  free a SAS remote PHY
1559  * @rphy: SAS remote PHY to free
1560  *
1561  * Frees the specified SAS remote PHY.
1562  *
1563  * Note:
1564  *   This function must only be called on a remote
1565  *   PHY that has not successfully been added using
1566  *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1567  */
1568 void sas_rphy_free(struct sas_rphy *rphy)
1569 {
1570     struct device *dev = &rphy->dev;
1571     struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1572     struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1573 
1574     mutex_lock(&sas_host->lock);
1575     list_del(&rphy->list);
1576     mutex_unlock(&sas_host->lock);
1577 
1578     transport_destroy_device(dev);
1579 
1580     put_device(dev);
1581 }
1582 EXPORT_SYMBOL(sas_rphy_free);
1583 
1584 /**
1585  * sas_rphy_delete  -  remove and free SAS remote PHY
1586  * @rphy:   SAS remote PHY to remove and free
1587  *
1588  * Removes the specified SAS remote PHY and frees it.
1589  */
1590 void
1591 sas_rphy_delete(struct sas_rphy *rphy)
1592 {
1593     sas_rphy_remove(rphy);
1594     sas_rphy_free(rphy);
1595 }
1596 EXPORT_SYMBOL(sas_rphy_delete);
1597 
1598 /**
1599  * sas_rphy_unlink  -  unlink SAS remote PHY
1600  * @rphy:   SAS remote phy to unlink from its parent port
1601  *
1602  * Removes port reference to an rphy
1603  */
1604 void sas_rphy_unlink(struct sas_rphy *rphy)
1605 {
1606     struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1607 
1608     parent->rphy = NULL;
1609 }
1610 EXPORT_SYMBOL(sas_rphy_unlink);
1611 
1612 /**
1613  * sas_rphy_remove  -  remove SAS remote PHY
1614  * @rphy:   SAS remote phy to remove
1615  *
1616  * Removes the specified SAS remote PHY.
1617  */
1618 void
1619 sas_rphy_remove(struct sas_rphy *rphy)
1620 {
1621     struct device *dev = &rphy->dev;
1622 
1623     switch (rphy->identify.device_type) {
1624     case SAS_END_DEVICE:
1625         scsi_remove_target(dev);
1626         break;
1627     case SAS_EDGE_EXPANDER_DEVICE:
1628     case SAS_FANOUT_EXPANDER_DEVICE:
1629         sas_remove_children(dev);
1630         break;
1631     default:
1632         break;
1633     }
1634 
1635     sas_rphy_unlink(rphy);
1636     bsg_remove_queue(rphy->q);
1637     transport_remove_device(dev);
1638     device_del(dev);
1639 }
1640 EXPORT_SYMBOL(sas_rphy_remove);
1641 
1642 /**
1643  * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
1644  * @dev:    device to check
1645  *
1646  * Returns:
1647  *  %1 if the device represents a SAS remote PHY, %0 else
1648  */
1649 int scsi_is_sas_rphy(const struct device *dev)
1650 {
1651     return dev->release == sas_end_device_release ||
1652         dev->release == sas_expander_release;
1653 }
1654 EXPORT_SYMBOL(scsi_is_sas_rphy);
1655 
1656 
1657 /*
1658  * SCSI scan helper
1659  */
1660 
1661 static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1662         uint id, u64 lun)
1663 {
1664     struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1665     struct sas_rphy *rphy;
1666 
1667     mutex_lock(&sas_host->lock);
1668     list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1669         if (rphy->identify.device_type != SAS_END_DEVICE ||
1670             rphy->scsi_target_id == -1)
1671             continue;
1672 
1673         if ((channel == SCAN_WILD_CARD || channel == 0) &&
1674             (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1675             scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id,
1676                      lun, SCSI_SCAN_MANUAL);
1677         }
1678     }
1679     mutex_unlock(&sas_host->lock);
1680 
1681     return 0;
1682 }
1683 
1684 
1685 /*
1686  * Setup / Teardown code
1687  */
1688 
1689 #define SETUP_TEMPLATE(attrb, field, perm, test)            \
1690     i->private_##attrb[count] = dev_attr_##field;       \
1691     i->private_##attrb[count].attr.mode = perm;         \
1692     i->attrb[count] = &i->private_##attrb[count];           \
1693     if (test)                           \
1694         count++
1695 
1696 #define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)   \
1697     i->private_##attrb[count] = dev_attr_##field;       \
1698     i->private_##attrb[count].attr.mode = perm;         \
1699     if (ro_test) {                          \
1700         i->private_##attrb[count].attr.mode = ro_perm;      \
1701         i->private_##attrb[count].store = NULL;         \
1702     }                               \
1703     i->attrb[count] = &i->private_##attrb[count];           \
1704     if (test)                           \
1705         count++
1706 
1707 #define SETUP_RPORT_ATTRIBUTE(field)                    \
1708     SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1709 
1710 #define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)         \
1711     SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1712 
1713 #define SETUP_PHY_ATTRIBUTE(field)                  \
1714     SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1715 
1716 #define SETUP_PHY_ATTRIBUTE_RW(field)                   \
1717     SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,   \
1718             !i->f->set_phy_speed, S_IRUGO)
1719 
1720 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)            \
1721     SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,   \
1722               !i->f->func, S_IRUGO)
1723 
1724 #define SETUP_PORT_ATTRIBUTE(field)                 \
1725     SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1726 
1727 #define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)           \
1728     SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1729 
1730 #define SETUP_PHY_ATTRIBUTE_WRONLY(field)               \
1731     SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1732 
1733 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)        \
1734     SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1735 
1736 #define SETUP_END_DEV_ATTRIBUTE(field)                  \
1737     SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1738 
1739 #define SETUP_EXPANDER_ATTRIBUTE(field)                 \
1740     SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1741 
1742 /**
1743  * sas_attach_transport  -  instantiate SAS transport template
1744  * @ft:     SAS transport class function template
1745  */
1746 struct scsi_transport_template *
1747 sas_attach_transport(struct sas_function_template *ft)
1748 {
1749     struct sas_internal *i;
1750     int count;
1751 
1752     i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1753     if (!i)
1754         return NULL;
1755 
1756     i->t.user_scan = sas_user_scan;
1757 
1758     i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1759     i->t.host_attrs.ac.class = &sas_host_class.class;
1760     i->t.host_attrs.ac.match = sas_host_match;
1761     transport_container_register(&i->t.host_attrs);
1762     i->t.host_size = sizeof(struct sas_host_attrs);
1763 
1764     i->phy_attr_cont.ac.class = &sas_phy_class.class;
1765     i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1766     i->phy_attr_cont.ac.match = sas_phy_match;
1767     transport_container_register(&i->phy_attr_cont);
1768 
1769     i->port_attr_cont.ac.class = &sas_port_class.class;
1770     i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1771     i->port_attr_cont.ac.match = sas_port_match;
1772     transport_container_register(&i->port_attr_cont);
1773 
1774     i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1775     i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1776     i->rphy_attr_cont.ac.match = sas_rphy_match;
1777     transport_container_register(&i->rphy_attr_cont);
1778 
1779     i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1780     i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1781     i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1782     transport_container_register(&i->end_dev_attr_cont);
1783 
1784     i->expander_attr_cont.ac.class = &sas_expander_class.class;
1785     i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1786     i->expander_attr_cont.ac.match = sas_expander_match;
1787     transport_container_register(&i->expander_attr_cont);
1788 
1789     i->f = ft;
1790 
1791     count = 0;
1792     SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1793     SETUP_PHY_ATTRIBUTE(target_port_protocols);
1794     SETUP_PHY_ATTRIBUTE(device_type);
1795     SETUP_PHY_ATTRIBUTE(sas_address);
1796     SETUP_PHY_ATTRIBUTE(phy_identifier);
1797     SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1798     SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1799     SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1800     SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1801     SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1802 
1803     SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1804     SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1805     SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1806     SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1807     SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1808     SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1809     SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1810     i->phy_attrs[count] = NULL;
1811 
1812     count = 0;
1813     SETUP_PORT_ATTRIBUTE(num_phys);
1814     i->port_attrs[count] = NULL;
1815 
1816     count = 0;
1817     SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1818     SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1819     SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1820     SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1821     SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1822     SETUP_RPORT_ATTRIBUTE(rphy_scsi_target_id);
1823     SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1824                        get_enclosure_identifier);
1825     SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1826                        get_bay_identifier);
1827     i->rphy_attrs[count] = NULL;
1828 
1829     count = 0;
1830     SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1831     SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1832     SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1833     SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1834     SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1835     i->end_dev_attrs[count] = NULL;
1836 
1837     count = 0;
1838     SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1839     SETUP_EXPANDER_ATTRIBUTE(product_id);
1840     SETUP_EXPANDER_ATTRIBUTE(product_rev);
1841     SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1842     SETUP_EXPANDER_ATTRIBUTE(component_id);
1843     SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1844     SETUP_EXPANDER_ATTRIBUTE(level);
1845     i->expander_attrs[count] = NULL;
1846 
1847     return &i->t;
1848 }
1849 EXPORT_SYMBOL(sas_attach_transport);
1850 
1851 /**
1852  * sas_release_transport  -  release SAS transport template instance
1853  * @t:      transport template instance
1854  */
1855 void sas_release_transport(struct scsi_transport_template *t)
1856 {
1857     struct sas_internal *i = to_sas_internal(t);
1858 
1859     transport_container_unregister(&i->t.host_attrs);
1860     transport_container_unregister(&i->phy_attr_cont);
1861     transport_container_unregister(&i->port_attr_cont);
1862     transport_container_unregister(&i->rphy_attr_cont);
1863     transport_container_unregister(&i->end_dev_attr_cont);
1864     transport_container_unregister(&i->expander_attr_cont);
1865 
1866     kfree(i);
1867 }
1868 EXPORT_SYMBOL(sas_release_transport);
1869 
1870 static __init int sas_transport_init(void)
1871 {
1872     int error;
1873 
1874     error = transport_class_register(&sas_host_class);
1875     if (error)
1876         goto out;
1877     error = transport_class_register(&sas_phy_class);
1878     if (error)
1879         goto out_unregister_transport;
1880     error = transport_class_register(&sas_port_class);
1881     if (error)
1882         goto out_unregister_phy;
1883     error = transport_class_register(&sas_rphy_class);
1884     if (error)
1885         goto out_unregister_port;
1886     error = transport_class_register(&sas_end_dev_class);
1887     if (error)
1888         goto out_unregister_rphy;
1889     error = transport_class_register(&sas_expander_class);
1890     if (error)
1891         goto out_unregister_end_dev;
1892 
1893     return 0;
1894 
1895  out_unregister_end_dev:
1896     transport_class_unregister(&sas_end_dev_class);
1897  out_unregister_rphy:
1898     transport_class_unregister(&sas_rphy_class);
1899  out_unregister_port:
1900     transport_class_unregister(&sas_port_class);
1901  out_unregister_phy:
1902     transport_class_unregister(&sas_phy_class);
1903  out_unregister_transport:
1904     transport_class_unregister(&sas_host_class);
1905  out:
1906     return error;
1907 
1908 }
1909 
1910 static void __exit sas_transport_exit(void)
1911 {
1912     transport_class_unregister(&sas_host_class);
1913     transport_class_unregister(&sas_phy_class);
1914     transport_class_unregister(&sas_port_class);
1915     transport_class_unregister(&sas_rphy_class);
1916     transport_class_unregister(&sas_end_dev_class);
1917     transport_class_unregister(&sas_expander_class);
1918 }
1919 
1920 MODULE_AUTHOR("Christoph Hellwig");
1921 MODULE_DESCRIPTION("SAS Transport Attributes");
1922 MODULE_LICENSE("GPL");
1923 
1924 module_init(sas_transport_init);
1925 module_exit(sas_transport_exit);
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