drivers/scsi/scsi_transport_sas.c

   1 /*
   2  * Copyright (C) 2005-2006 Dell Inc.
   3  *      Released under GPL v2.
   4  *
   5  * Serial Attached SCSI (SAS) transport class.
   6  *
   7  * The SAS transport class contains common code to deal with SAS HBAs,
   8  * an aproximated representation of SAS topologies in the driver model,
   9  * and various sysfs attributes to expose these topologies and managment
  10  * interfaces to userspace.
  11  *
  12  * In addition to the basic SCSI core objects this transport class
  13  * introduces two additional intermediate objects:  The SAS PHY
  14  * as represented by struct sas_phy defines an "outgoing" PHY on
  15  * a SAS HBA or Expander, and the SAS remote PHY represented by
  16  * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
  17  * end device.  Note that this is purely a software concept, the
  18  * underlying hardware for a PHY and a remote PHY is the exactly
  19  * the same.
  20  *
  21  * There is no concept of a SAS port in this code, users can see
  22  * what PHYs form a wide port based on the port_identifier attribute,
  23  * which is the same for all PHYs in a port.
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/module.h>
  28 #include <linux/err.h>
  29 #include <linux/slab.h>
  30 #include <linux/string.h>
  31
  32 #include <scsi/scsi.h>
  33 #include <scsi/scsi_device.h>
  34 #include <scsi/scsi_host.h>
  35 #include <scsi/scsi_transport.h>
  36 #include <scsi/scsi_transport_sas.h>
  37
  38
  39 #define SAS_HOST_ATTRS          0
  40 #define SAS_PORT_ATTRS          17
  41 #define SAS_RPORT_ATTRS         7
  42 #define SAS_END_DEV_ATTRS       3
  43 #define SAS_EXPANDER_ATTRS      7
  44
  45 struct sas_internal {
  46         struct scsi_transport_template t;
  47         struct sas_function_template *f;
  48
  49         struct class_device_attribute private_host_attrs[SAS_HOST_ATTRS];
  50         struct class_device_attribute private_phy_attrs[SAS_PORT_ATTRS];
  51         struct class_device_attribute private_rphy_attrs[SAS_RPORT_ATTRS];
  52         struct class_device_attribute private_end_dev_attrs[SAS_END_DEV_ATTRS];
  53         struct class_device_attribute private_expander_attrs[SAS_EXPANDER_ATTRS];
  54
  55         struct transport_container phy_attr_cont;
  56         struct transport_container rphy_attr_cont;
  57         struct transport_container end_dev_attr_cont;
  58         struct transport_container expander_attr_cont;
  59
  60         /*
  61          * The array of null terminated pointers to attributes
  62          * needed by scsi_sysfs.c
  63          */
  64         struct class_device_attribute *host_attrs[SAS_HOST_ATTRS + 1];
  65         struct class_device_attribute *phy_attrs[SAS_PORT_ATTRS + 1];
  66         struct class_device_attribute *rphy_attrs[SAS_RPORT_ATTRS + 1];
  67         struct class_device_attribute *end_dev_attrs[SAS_END_DEV_ATTRS + 1];
  68         struct class_device_attribute *expander_attrs[SAS_EXPANDER_ATTRS + 1];
  69 };
  70 #define to_sas_internal(tmpl)   container_of(tmpl, struct sas_internal, t)
  71
  72 struct sas_host_attrs {
  73         struct list_head rphy_list;
  74         struct mutex lock;
  75         u32 next_target_id;
  76         u32 next_expander_id;
  77 };
  78 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
  79
  80
  81 /*
  82  * Hack to allow attributes of the same name in different objects.
  83  */
  84 #define SAS_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  85         struct class_device_attribute class_device_attr_##_prefix##_##_name = \
  86         __ATTR(_name,_mode,_show,_store)
  87
  88
  89 /*
  90  * Pretty printing helpers
  91  */
  92
  93 #define sas_bitfield_name_match(title, table)                   \
  94 static ssize_t                                                  \
  95 get_sas_##title##_names(u32 table_key, char *buf)               \
  96 {                                                               \
  97         char *prefix = "";                                      \
  98         ssize_t len = 0;                                        \
  99         int i;                                                  \
 100                                                                 \
 101         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
 102                 if (table[i].value & table_key) {               \
 103                         len += sprintf(buf + len, "%s%s",       \
 104                                 prefix, table[i].name);         \
 105                         prefix = ", ";                          \
 106                 }                                               \
 107         }                                                       \
 108         len += sprintf(buf + len, "\n");                        \
 109         return len;                                             \
 110 }
 111
 112 #define sas_bitfield_name_search(title, table)                  \
 113 static ssize_t                                                  \
 114 get_sas_##title##_names(u32 table_key, char *buf)               \
 115 {                                                               \
 116         ssize_t len = 0;                                        \
 117         int i;                                                  \
 118                                                                 \
 119         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
 120                 if (table[i].value == table_key) {              \
 121                         len += sprintf(buf + len, "%s",         \
 122                                 table[i].name);                 \
 123                         break;                                  \
 124                 }                                               \
 125         }                                                       \
 126         len += sprintf(buf + len, "\n");                        \
 127         return len;                                             \
 128 }
 129
 130 static struct {
 131         u32             value;
 132         char            *name;
 133 } sas_device_type_names[] = {
 134         { SAS_PHY_UNUSED,               "unused" },
 135         { SAS_END_DEVICE,               "end device" },
 136         { SAS_EDGE_EXPANDER_DEVICE,     "edge expander" },
 137         { SAS_FANOUT_EXPANDER_DEVICE,   "fanout expander" },
 138 };
 139 sas_bitfield_name_search(device_type, sas_device_type_names)
 140
 141
 142 static struct {
 143         u32             value;
 144         char            *name;
 145 } sas_protocol_names[] = {
 146         { SAS_PROTOCOL_SATA,            "sata" },
 147         { SAS_PROTOCOL_SMP,             "smp" },
 148         { SAS_PROTOCOL_STP,             "stp" },
 149         { SAS_PROTOCOL_SSP,             "ssp" },
 150 };
 151 sas_bitfield_name_match(protocol, sas_protocol_names)
 152
 153 static struct {
 154         u32             value;
 155         char            *name;
 156 } sas_linkspeed_names[] = {
 157         { SAS_LINK_RATE_UNKNOWN,        "Unknown" },
 158         { SAS_PHY_DISABLED,             "Phy disabled" },
 159         { SAS_LINK_RATE_FAILED,         "Link Rate failed" },
 160         { SAS_SATA_SPINUP_HOLD,         "Spin-up hold" },
 161         { SAS_LINK_RATE_1_5_GBPS,       "1.5 Gbit" },
 162         { SAS_LINK_RATE_3_0_GBPS,       "3.0 Gbit" },
 163         { SAS_LINK_RATE_6_0_GBPS,       "6.0 Gbit" },
 164 };
 165 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 166
 167
 168 /*
 169  * SAS host attributes
 170  */
 171
 172 static int sas_host_setup(struct transport_container *tc, struct device *dev,
 173                           struct class_device *cdev)
 174 {
 175         struct Scsi_Host *shost = dev_to_shost(dev);
 176         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 177
 178         INIT_LIST_HEAD(&sas_host->rphy_list);
 179         mutex_init(&sas_host->lock);
 180         sas_host->next_target_id = 0;
 181         sas_host->next_expander_id = 0;
 182         return 0;
 183 }
 184
 185 static DECLARE_TRANSPORT_CLASS(sas_host_class,
 186                 "sas_host", sas_host_setup, NULL, NULL);
 187
 188 static int sas_host_match(struct attribute_container *cont,
 189                             struct device *dev)
 190 {
 191         struct Scsi_Host *shost;
 192         struct sas_internal *i;
 193
 194         if (!scsi_is_host_device(dev))
 195                 return 0;
 196         shost = dev_to_shost(dev);
 197
 198         if (!shost->transportt)
 199                 return 0;
 200         if (shost->transportt->host_attrs.ac.class !=
 201                         &sas_host_class.class)
 202                 return 0;
 203
 204         i = to_sas_internal(shost->transportt);
 205         return &i->t.host_attrs.ac == cont;
 206 }
 207
 208 static int do_sas_phy_delete(struct device *dev, void *data)
 209 {
 210         if (scsi_is_sas_phy(dev))
 211                 sas_phy_delete(dev_to_phy(dev));
 212         return 0;
 213 }
 214
 215 /**
 216  * sas_remove_host  --  tear down a Scsi_Host's SAS data structures
 217  * @shost:      Scsi Host that is torn down
 218  *
 219  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
 220  * Must be called just before scsi_remove_host for SAS HBAs.
 221  */
 222 void sas_remove_host(struct Scsi_Host *shost)
 223 {
 224         device_for_each_child(&shost->shost_gendev, NULL, do_sas_phy_delete);
 225 }
 226 EXPORT_SYMBOL(sas_remove_host);
 227
 228
 229 /*
 230  * SAS Port attributes
 231  */
 232
 233 #define sas_phy_show_simple(field, name, format_string, cast)           \
 234 static ssize_t                                                          \
 235 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
 236 {                                                                       \
 237         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 238                                                                         \
 239         return snprintf(buf, 20, format_string, cast phy->field);       \
 240 }
 241
 242 #define sas_phy_simple_attr(field, name, format_string, type)           \
 243         sas_phy_show_simple(field, name, format_string, (type)) \
 244 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 245
 246 #define sas_phy_show_protocol(field, name)                              \
 247 static ssize_t                                                          \
 248 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
 249 {                                                                       \
 250         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 251                                                                         \
 252         if (!phy->field)                                                \
 253                 return snprintf(buf, 20, "none\n");                     \
 254         return get_sas_protocol_names(phy->field, buf);         \
 255 }
 256
 257 #define sas_phy_protocol_attr(field, name)                              \
 258         sas_phy_show_protocol(field, name)                              \
 259 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 260
 261 #define sas_phy_show_linkspeed(field)                                   \
 262 static ssize_t                                                          \
 263 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
 264 {                                                                       \
 265         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 266                                                                         \
 267         return get_sas_linkspeed_names(phy->field, buf);                \
 268 }
 269
 270 #define sas_phy_linkspeed_attr(field)                                   \
 271         sas_phy_show_linkspeed(field)                                   \
 272 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 273
 274 #define sas_phy_show_linkerror(field)                                   \
 275 static ssize_t                                                          \
 276 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
 277 {                                                                       \
 278         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 279         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 280         struct sas_internal *i = to_sas_internal(shost->transportt);    \
 281         int error;                                                      \
 282                                                                         \
 283         if (!phy->local_attached)                                       \
 284                 return -EINVAL;                                         \
 285                                                                         \
 286         error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;   \
 287         if (error)                                                      \
 288                 return error;                                           \
 289         return snprintf(buf, 20, "%u\n", phy->field);                   \
 290 }
 291
 292 #define sas_phy_linkerror_attr(field)                                   \
 293         sas_phy_show_linkerror(field)                                   \
 294 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 295
 296
 297 static ssize_t
 298 show_sas_device_type(struct class_device *cdev, char *buf)
 299 {
 300         struct sas_phy *phy = transport_class_to_phy(cdev);
 301
 302         if (!phy->identify.device_type)
 303                 return snprintf(buf, 20, "none\n");
 304         return get_sas_device_type_names(phy->identify.device_type, buf);
 305 }
 306 static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 307
 308 static ssize_t do_sas_phy_reset(struct class_device *cdev,
 309                 size_t count, int hard_reset)
 310 {
 311         struct sas_phy *phy = transport_class_to_phy(cdev);
 312         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 313         struct sas_internal *i = to_sas_internal(shost->transportt);
 314         int error;
 315
 316         if (!phy->local_attached)
 317                 return -EINVAL;
 318
 319         error = i->f->phy_reset(phy, hard_reset);
 320         if (error)
 321                 return error;
 322         return count;
 323 };
 324
 325 static ssize_t store_sas_link_reset(struct class_device *cdev,
 326                 const char *buf, size_t count)
 327 {
 328         return do_sas_phy_reset(cdev, count, 0);
 329 }
 330 static CLASS_DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 331
 332 static ssize_t store_sas_hard_reset(struct class_device *cdev,
 333                 const char *buf, size_t count)
 334 {
 335         return do_sas_phy_reset(cdev, count, 1);
 336 }
 337 static CLASS_DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 338
 339 sas_phy_protocol_attr(identify.initiator_port_protocols,
 340                 initiator_port_protocols);
 341 sas_phy_protocol_attr(identify.target_port_protocols,
 342                 target_port_protocols);
 343 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 344                 unsigned long long);
 345 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 346 sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", u8);
 347 sas_phy_linkspeed_attr(negotiated_linkrate);
 348 sas_phy_linkspeed_attr(minimum_linkrate_hw);
 349 sas_phy_linkspeed_attr(minimum_linkrate);
 350 sas_phy_linkspeed_attr(maximum_linkrate_hw);
 351 sas_phy_linkspeed_attr(maximum_linkrate);
 352 sas_phy_linkerror_attr(invalid_dword_count);
 353 sas_phy_linkerror_attr(running_disparity_error_count);
 354 sas_phy_linkerror_attr(loss_of_dword_sync_count);
 355 sas_phy_linkerror_attr(phy_reset_problem_count);
 356
 357
 358 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 359                 "sas_phy", NULL, NULL, NULL);
 360
 361 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 362 {
 363         struct Scsi_Host *shost;
 364         struct sas_internal *i;
 365
 366         if (!scsi_is_sas_phy(dev))
 367                 return 0;
 368         shost = dev_to_shost(dev->parent);
 369
 370         if (!shost->transportt)
 371                 return 0;
 372         if (shost->transportt->host_attrs.ac.class !=
 373                         &sas_host_class.class)
 374                 return 0;
 375
 376         i = to_sas_internal(shost->transportt);
 377         return &i->phy_attr_cont.ac == cont;
 378 }
 379
 380 static void sas_phy_release(struct device *dev)
 381 {
 382         struct sas_phy *phy = dev_to_phy(dev);
 383
 384         put_device(dev->parent);
 385         kfree(phy);
 386 }
 387
 388 /**
 389  * sas_phy_alloc  --  allocates and initialize a SAS PHY structure
 390  * @parent:     Parent device
 391  * @number:     Phy index
 392  *
 393  * Allocates an SAS PHY structure.  It will be added in the device tree
 394  * below the device specified by @parent, which has to be either a Scsi_Host
 395  * or sas_rphy.
 396  *
 397  * Returns:
 398  *      SAS PHY allocated or %NULL if the allocation failed.
 399  */
 400 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 401 {
 402         struct Scsi_Host *shost = dev_to_shost(parent);
 403         struct sas_phy *phy;
 404
 405         phy = kzalloc(sizeof(*phy), GFP_KERNEL);
 406         if (!phy)
 407                 return NULL;
 408
 409         phy->number = number;
 410
 411         device_initialize(&phy->dev);
 412         phy->dev.parent = get_device(parent);
 413         phy->dev.release = sas_phy_release;
 414         if (scsi_is_sas_expander_device(parent)) {
 415                 struct sas_rphy *rphy = dev_to_rphy(parent);
 416                 sprintf(phy->dev.bus_id, "phy-%d-%d:%d", shost->host_no,
 417                         rphy->scsi_target_id, number);
 418         } else
 419                 sprintf(phy->dev.bus_id, "phy-%d:%d", shost->host_no, number);
 420
 421         transport_setup_device(&phy->dev);
 422
 423         return phy;
 424 }
 425 EXPORT_SYMBOL(sas_phy_alloc);
 426
 427 /**
 428  * sas_phy_add  --  add a SAS PHY to the device hierachy
 429  * @phy:        The PHY to be added
 430  *
 431  * Publishes a SAS PHY to the rest of the system.
 432  */
 433 int sas_phy_add(struct sas_phy *phy)
 434 {
 435         int error;
 436
 437         error = device_add(&phy->dev);
 438         if (!error) {
 439                 transport_add_device(&phy->dev);
 440                 transport_configure_device(&phy->dev);
 441         }
 442
 443         return error;
 444 }
 445 EXPORT_SYMBOL(sas_phy_add);
 446
 447 /**
 448  * sas_phy_free  --  free a SAS PHY
 449  * @phy:        SAS PHY to free
 450  *
 451  * Frees the specified SAS PHY.
 452  *
 453  * Note:
 454  *   This function must only be called on a PHY that has not
 455  *   sucessfully been added using sas_phy_add().
 456  */
 457 void sas_phy_free(struct sas_phy *phy)
 458 {
 459         transport_destroy_device(&phy->dev);
 460         put_device(&phy->dev);
 461 }
 462 EXPORT_SYMBOL(sas_phy_free);
 463
 464 /**
 465  * sas_phy_delete  --  remove SAS PHY
 466  * @phy:        SAS PHY to remove
 467  *
 468  * Removes the specified SAS PHY.  If the SAS PHY has an
 469  * associated remote PHY it is removed before.
 470  */
 471 void
 472 sas_phy_delete(struct sas_phy *phy)
 473 {
 474         struct device *dev = &phy->dev;
 475
 476         if (phy->rphy)
 477                 sas_rphy_delete(phy->rphy);
 478
 479         transport_remove_device(dev);
 480         device_del(dev);
 481         transport_destroy_device(dev);
 482         put_device(dev);
 483 }
 484 EXPORT_SYMBOL(sas_phy_delete);
 485
 486 /**
 487  * scsi_is_sas_phy  --  check if a struct device represents a SAS PHY
 488  * @dev:        device to check
 489  *
 490  * Returns:
 491  *      %1 if the device represents a SAS PHY, %0 else
 492  */
 493 int scsi_is_sas_phy(const struct device *dev)
 494 {
 495         return dev->release == sas_phy_release;
 496 }
 497 EXPORT_SYMBOL(scsi_is_sas_phy);
 498
 499 /*
 500  * SAS remote PHY attributes.
 501  */
 502
 503 #define sas_rphy_show_simple(field, name, format_string, cast)          \
 504 static ssize_t                                                          \
 505 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
 506 {                                                                       \
 507         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
 508                                                                         \
 509         return snprintf(buf, 20, format_string, cast rphy->field);      \
 510 }
 511
 512 #define sas_rphy_simple_attr(field, name, format_string, type)          \
 513         sas_rphy_show_simple(field, name, format_string, (type))        \
 514 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
 515                 show_sas_rphy_##name, NULL)
 516
 517 #define sas_rphy_show_protocol(field, name)                             \
 518 static ssize_t                                                          \
 519 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
 520 {                                                                       \
 521         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
 522                                                                         \
 523         if (!rphy->field)                                       \
 524                 return snprintf(buf, 20, "none\n");                     \
 525         return get_sas_protocol_names(rphy->field, buf);        \
 526 }
 527
 528 #define sas_rphy_protocol_attr(field, name)                             \
 529         sas_rphy_show_protocol(field, name)                             \
 530 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
 531                 show_sas_rphy_##name, NULL)
 532
 533 static ssize_t
 534 show_sas_rphy_device_type(struct class_device *cdev, char *buf)
 535 {
 536         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
 537
 538         if (!rphy->identify.device_type)
 539                 return snprintf(buf, 20, "none\n");
 540         return get_sas_device_type_names(
 541                         rphy->identify.device_type, buf);
 542 }
 543
 544 static SAS_CLASS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
 545                 show_sas_rphy_device_type, NULL);
 546
 547 static ssize_t
 548 show_sas_rphy_enclosure_identifier(struct class_device *cdev, char *buf)
 549 {
 550         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
 551         struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
 552         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 553         struct sas_internal *i = to_sas_internal(shost->transportt);
 554         u64 identifier;
 555         int error;
 556
 557         /*
 558          * Only devices behind an expander are supported, because the
 559          * enclosure identifier is a SMP feature.
 560          */
 561         if (phy->local_attached)
 562                 return -EINVAL;
 563
 564         error = i->f->get_enclosure_identifier(rphy, &identifier);
 565         if (error)
 566                 return error;
 567         return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
 568 }
 569
 570 static SAS_CLASS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
 571                 show_sas_rphy_enclosure_identifier, NULL);
 572
 573 static ssize_t
 574 show_sas_rphy_bay_identifier(struct class_device *cdev, char *buf)
 575 {
 576         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
 577         struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
 578         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 579         struct sas_internal *i = to_sas_internal(shost->transportt);
 580         int val;
 581
 582         if (phy->local_attached)
 583                 return -EINVAL;
 584
 585         val = i->f->get_bay_identifier(rphy);
 586         if (val < 0)
 587                 return val;
 588         return sprintf(buf, "%d\n", val);
 589 }
 590
 591 static SAS_CLASS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
 592                 show_sas_rphy_bay_identifier, NULL);
 593
 594 sas_rphy_protocol_attr(identify.initiator_port_protocols,
 595                 initiator_port_protocols);
 596 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
 597 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 598                 unsigned long long);
 599 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 600
 601 /* only need 8 bytes of data plus header (4 or 8) */
 602 #define BUF_SIZE 64
 603
 604 int sas_read_port_mode_page(struct scsi_device *sdev)
 605 {
 606         char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
 607         struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
 608         struct sas_end_device *rdev;
 609         struct scsi_mode_data mode_data;
 610         int res, error;
 611
 612         BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
 613
 614         rdev = rphy_to_end_device(rphy);
 615
 616         if (!buffer)
 617                 return -ENOMEM;
 618
 619         res = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
 620                               &mode_data, NULL);
 621
 622         error = -EINVAL;
 623         if (!scsi_status_is_good(res))
 624                 goto out;
 625
 626         msdata = buffer +  mode_data.header_length +
 627                 mode_data.block_descriptor_length;
 628
 629         if (msdata - buffer > BUF_SIZE - 8)
 630                 goto out;
 631
 632         error = 0;
 633
 634         rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
 635         rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
 636         rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
 637
 638  out:
 639         kfree(buffer);
 640         return error;
 641 }
 642 EXPORT_SYMBOL(sas_read_port_mode_page);
 643
 644 static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
 645                                "sas_end_device", NULL, NULL, NULL);
 646
 647 #define sas_end_dev_show_simple(field, name, format_string, cast)       \
 648 static ssize_t                                                          \
 649 show_sas_end_dev_##name(struct class_device *cdev, char *buf)           \
 650 {                                                                       \
 651         struct sas_rphy *rphy = transport_class_to_rphy(cdev);          \
 652         struct sas_end_device *rdev = rphy_to_end_device(rphy);         \
 653                                                                         \
 654         return snprintf(buf, 20, format_string, cast rdev->field);      \
 655 }
 656
 657 #define sas_end_dev_simple_attr(field, name, format_string, type)       \
 658         sas_end_dev_show_simple(field, name, format_string, (type))     \
 659 static SAS_CLASS_DEVICE_ATTR(end_dev, name, S_IRUGO,                    \
 660                 show_sas_end_dev_##name, NULL)
 661
 662 sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
 663 sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
 664                         "%d\n", int);
 665 sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
 666                         "%d\n", int);
 667
 668 static DECLARE_TRANSPORT_CLASS(sas_expander_class,
 669                                "sas_expander", NULL, NULL, NULL);
 670
 671 #define sas_expander_show_simple(field, name, format_string, cast)      \
 672 static ssize_t                                                          \
 673 show_sas_expander_##name(struct class_device *cdev, char *buf)          \
 674 {                                                                       \
 675         struct sas_rphy *rphy = transport_class_to_rphy(cdev);          \
 676         struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
 677                                                                         \
 678         return snprintf(buf, 20, format_string, cast edev->field);      \
 679 }
 680
 681 #define sas_expander_simple_attr(field, name, format_string, type)      \
 682         sas_expander_show_simple(field, name, format_string, (type))    \
 683 static SAS_CLASS_DEVICE_ATTR(expander, name, S_IRUGO,                   \
 684                 show_sas_expander_##name, NULL)
 685
 686 sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
 687 sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
 688 sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
 689 sas_expander_simple_attr(component_vendor_id, component_vendor_id,
 690                          "%s\n", char *);
 691 sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
 692 sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
 693                          unsigned int);
 694 sas_expander_simple_attr(level, level, "%d\n", int);
 695
 696 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
 697                 "sas_device", NULL, NULL, NULL);
 698
 699 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
 700 {
 701         struct Scsi_Host *shost;
 702         struct sas_internal *i;
 703
 704         if (!scsi_is_sas_rphy(dev))
 705                 return 0;
 706         shost = dev_to_shost(dev->parent->parent);
 707
 708         if (!shost->transportt)
 709                 return 0;
 710         if (shost->transportt->host_attrs.ac.class !=
 711                         &sas_host_class.class)
 712                 return 0;
 713
 714         i = to_sas_internal(shost->transportt);
 715         return &i->rphy_attr_cont.ac == cont;
 716 }
 717
 718 static int sas_end_dev_match(struct attribute_container *cont,
 719                              struct device *dev)
 720 {
 721         struct Scsi_Host *shost;
 722         struct sas_internal *i;
 723         struct sas_rphy *rphy;
 724
 725         if (!scsi_is_sas_rphy(dev))
 726                 return 0;
 727         shost = dev_to_shost(dev->parent->parent);
 728         rphy = dev_to_rphy(dev);
 729
 730         if (!shost->transportt)
 731                 return 0;
 732         if (shost->transportt->host_attrs.ac.class !=
 733                         &sas_host_class.class)
 734                 return 0;
 735
 736         i = to_sas_internal(shost->transportt);
 737         return &i->end_dev_attr_cont.ac == cont &&
 738                 rphy->identify.device_type == SAS_END_DEVICE;
 739 }
 740
 741 static int sas_expander_match(struct attribute_container *cont,
 742                               struct device *dev)
 743 {
 744         struct Scsi_Host *shost;
 745         struct sas_internal *i;
 746         struct sas_rphy *rphy;
 747
 748         if (!scsi_is_sas_rphy(dev))
 749                 return 0;
 750         shost = dev_to_shost(dev->parent->parent);
 751         rphy = dev_to_rphy(dev);
 752
 753         if (!shost->transportt)
 754                 return 0;
 755         if (shost->transportt->host_attrs.ac.class !=
 756                         &sas_host_class.class)
 757                 return 0;
 758
 759         i = to_sas_internal(shost->transportt);
 760         return &i->expander_attr_cont.ac == cont &&
 761                 (rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
 762                  rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
 763 }
 764
 765 static void sas_expander_release(struct device *dev)
 766 {
 767         struct sas_rphy *rphy = dev_to_rphy(dev);
 768         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 769
 770         put_device(dev->parent);
 771         kfree(edev);
 772 }
 773
 774 static void sas_end_device_release(struct device *dev)
 775 {
 776         struct sas_rphy *rphy = dev_to_rphy(dev);
 777         struct sas_end_device *edev = rphy_to_end_device(rphy);
 778
 779         put_device(dev->parent);
 780         kfree(edev);
 781 }
 782
 783 /**
 784  * sas_end_device_alloc - allocate an rphy for an end device
 785  *
 786  * Allocates an SAS remote PHY structure, connected to @parent.
 787  *
 788  * Returns:
 789  *      SAS PHY allocated or %NULL if the allocation failed.
 790  */
 791 struct sas_rphy *sas_end_device_alloc(struct sas_phy *parent)
 792 {
 793         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
 794         struct sas_end_device *rdev;
 795
 796         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
 797         if (!rdev) {
 798                 return NULL;
 799         }
 800
 801         device_initialize(&rdev->rphy.dev);
 802         rdev->rphy.dev.parent = get_device(&parent->dev);
 803         rdev->rphy.dev.release = sas_end_device_release;
 804         sprintf(rdev->rphy.dev.bus_id, "end_device-%d:%d-%d",
 805                 shost->host_no, parent->port_identifier, parent->number);
 806         rdev->rphy.identify.device_type = SAS_END_DEVICE;
 807         transport_setup_device(&rdev->rphy.dev);
 808
 809         return &rdev->rphy;
 810 }
 811 EXPORT_SYMBOL(sas_end_device_alloc);
 812
 813 /**
 814  * sas_expander_alloc - allocate an rphy for an end device
 815  *
 816  * Allocates an SAS remote PHY structure, connected to @parent.
 817  *
 818  * Returns:
 819  *      SAS PHY allocated or %NULL if the allocation failed.
 820  */
 821 struct sas_rphy *sas_expander_alloc(struct sas_phy *parent,
 822                                     enum sas_device_type type)
 823 {
 824         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
 825         struct sas_expander_device *rdev;
 826         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 827
 828         BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
 829                type != SAS_FANOUT_EXPANDER_DEVICE);
 830
 831         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
 832         if (!rdev) {
 833                 return NULL;
 834         }
 835
 836         device_initialize(&rdev->rphy.dev);
 837         rdev->rphy.dev.parent = get_device(&parent->dev);
 838         rdev->rphy.dev.release = sas_expander_release;
 839         mutex_lock(&sas_host->lock);
 840         rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
 841         mutex_unlock(&sas_host->lock);
 842         sprintf(rdev->rphy.dev.bus_id, "expander-%d:%d",
 843                 shost->host_no, rdev->rphy.scsi_target_id);
 844         rdev->rphy.identify.device_type = type;
 845         transport_setup_device(&rdev->rphy.dev);
 846
 847         return &rdev->rphy;
 848 }
 849 EXPORT_SYMBOL(sas_expander_alloc);
 850
 851 /**
 852  * sas_rphy_add  --  add a SAS remote PHY to the device hierachy
 853  * @rphy:       The remote PHY to be added
 854  *
 855  * Publishes a SAS remote PHY to the rest of the system.
 856  */
 857 int sas_rphy_add(struct sas_rphy *rphy)
 858 {
 859         struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
 860         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
 861         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 862         struct sas_identify *identify = &rphy->identify;
 863         int error;
 864
 865         if (parent->rphy)
 866                 return -ENXIO;
 867         parent->rphy = rphy;
 868
 869         error = device_add(&rphy->dev);
 870         if (error)
 871                 return error;
 872         transport_add_device(&rphy->dev);
 873         transport_configure_device(&rphy->dev);
 874
 875         mutex_lock(&sas_host->lock);
 876         list_add_tail(&rphy->list, &sas_host->rphy_list);
 877         if (identify->device_type == SAS_END_DEVICE &&
 878             (identify->target_port_protocols &
 879              (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
 880                 rphy->scsi_target_id = sas_host->next_target_id++;
 881         mutex_unlock(&sas_host->lock);
 882
 883         if (identify->device_type == SAS_END_DEVICE &&
 884             rphy->scsi_target_id != -1) {
 885                 scsi_scan_target(&rphy->dev, parent->port_identifier,
 886                                 rphy->scsi_target_id, ~0, 0);
 887         }
 888
 889         return 0;
 890 }
 891 EXPORT_SYMBOL(sas_rphy_add);
 892
 893 /**
 894  * sas_rphy_free  --  free a SAS remote PHY
 895  * @rphy        SAS remote PHY to free
 896  *
 897  * Frees the specified SAS remote PHY.
 898  *
 899  * Note:
 900  *   This function must only be called on a remote
 901  *   PHY that has not sucessfully been added using
 902  *   sas_rphy_add().
 903  */
 904 void sas_rphy_free(struct sas_rphy *rphy)
 905 {
 906         struct device *dev = &rphy->dev;
 907         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
 908         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 909
 910         mutex_lock(&sas_host->lock);
 911         list_del(&rphy->list);
 912         mutex_unlock(&sas_host->lock);
 913
 914         transport_destroy_device(dev);
 915
 916         put_device(dev);
 917 }
 918 EXPORT_SYMBOL(sas_rphy_free);
 919
 920 /**
 921  * sas_rphy_delete  --  remove SAS remote PHY
 922  * @rphy:       SAS remote PHY to remove
 923  *
 924  * Removes the specified SAS remote PHY.
 925  */
 926 void
 927 sas_rphy_delete(struct sas_rphy *rphy)
 928 {
 929         struct device *dev = &rphy->dev;
 930         struct sas_phy *parent = dev_to_phy(dev->parent);
 931         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
 932         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 933
 934         switch (rphy->identify.device_type) {
 935         case SAS_END_DEVICE:
 936                 scsi_remove_target(dev);
 937                 break;
 938         case SAS_EDGE_EXPANDER_DEVICE:
 939         case SAS_FANOUT_EXPANDER_DEVICE:
 940                 device_for_each_child(dev, NULL, do_sas_phy_delete);
 941                 break;
 942         default:
 943                 break;
 944         }
 945
 946         transport_remove_device(dev);
 947         device_del(dev);
 948         transport_destroy_device(dev);
 949
 950         mutex_lock(&sas_host->lock);
 951         list_del(&rphy->list);
 952         mutex_unlock(&sas_host->lock);
 953
 954         parent->rphy = NULL;
 955
 956         put_device(dev);
 957 }
 958 EXPORT_SYMBOL(sas_rphy_delete);
 959
 960 /**
 961  * scsi_is_sas_rphy  --  check if a struct device represents a SAS remote PHY
 962  * @dev:        device to check
 963  *
 964  * Returns:
 965  *      %1 if the device represents a SAS remote PHY, %0 else
 966  */
 967 int scsi_is_sas_rphy(const struct device *dev)
 968 {
 969         return dev->release == sas_end_device_release ||
 970                 dev->release == sas_expander_release;
 971 }
 972 EXPORT_SYMBOL(scsi_is_sas_rphy);
 973
 974
 975 /*
 976  * SCSI scan helper
 977  */
 978
 979 static int sas_user_scan(struct Scsi_Host *shost, uint channel,
 980                 uint id, uint lun)
 981 {
 982         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 983         struct sas_rphy *rphy;
 984
 985         mutex_lock(&sas_host->lock);
 986         list_for_each_entry(rphy, &sas_host->rphy_list, list) {
 987                 struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
 988
 989                 if (rphy->scsi_target_id == -1)
 990                         continue;
 991
 992                 if ((channel == SCAN_WILD_CARD || channel == parent->port_identifier) &&
 993                     (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
 994                         scsi_scan_target(&rphy->dev, parent->port_identifier,
 995                                          rphy->scsi_target_id, lun, 1);
 996                 }
 997         }
 998         mutex_unlock(&sas_host->lock);
 999
1000         return 0;
1001 }
1002
1003
1004 /*
1005  * Setup / Teardown code
1006  */
1007
1008 #define SETUP_TEMPLATE(attrb, field, perm, test)                                \
1009         i->private_##attrb[count] = class_device_attr_##field;          \
1010         i->private_##attrb[count].attr.mode = perm;                     \
1011         i->private_##attrb[count].store = NULL;                         \
1012         i->attrb[count] = &i->private_##attrb[count];                   \
1013         if (test)                                                       \
1014                 count++
1015
1016
1017 #define SETUP_RPORT_ATTRIBUTE(field)                                    \
1018         SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1019
1020 #define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)                     \
1021         SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1022
1023 #define SETUP_PORT_ATTRIBUTE(field)                                     \
1024         SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1025
1026 #define SETUP_OPTIONAL_PORT_ATTRIBUTE(field, func)                      \
1027         SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1028
1029 #define SETUP_PORT_ATTRIBUTE_WRONLY(field)                              \
1030         SETUP_TEMPLATE(phy_attrs, field, S_IWUGO, 1)
1031
1032 #define SETUP_OPTIONAL_PORT_ATTRIBUTE_WRONLY(field, func)               \
1033         SETUP_TEMPLATE(phy_attrs, field, S_IWUGO, i->f->func)
1034
1035 #define SETUP_END_DEV_ATTRIBUTE(field)                                  \
1036         SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1037
1038 #define SETUP_EXPANDER_ATTRIBUTE(field)                                 \
1039         SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1040
1041 /**
1042  * sas_attach_transport  --  instantiate SAS transport template
1043  * @ft:         SAS transport class function template
1044  */
1045 struct scsi_transport_template *
1046 sas_attach_transport(struct sas_function_template *ft)
1047 {
1048         struct sas_internal *i;
1049         int count;
1050
1051         i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1052         if (!i)
1053                 return NULL;
1054
1055         i->t.user_scan = sas_user_scan;
1056
1057         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1058         i->t.host_attrs.ac.class = &sas_host_class.class;
1059         i->t.host_attrs.ac.match = sas_host_match;
1060         transport_container_register(&i->t.host_attrs);
1061         i->t.host_size = sizeof(struct sas_host_attrs);
1062
1063         i->phy_attr_cont.ac.class = &sas_phy_class.class;
1064         i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1065         i->phy_attr_cont.ac.match = sas_phy_match;
1066         transport_container_register(&i->phy_attr_cont);
1067
1068         i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1069         i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1070         i->rphy_attr_cont.ac.match = sas_rphy_match;
1071         transport_container_register(&i->rphy_attr_cont);
1072
1073         i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1074         i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1075         i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1076         transport_container_register(&i->end_dev_attr_cont);
1077
1078         i->expander_attr_cont.ac.class = &sas_expander_class.class;
1079         i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1080         i->expander_attr_cont.ac.match = sas_expander_match;
1081         transport_container_register(&i->expander_attr_cont);
1082
1083         i->f = ft;
1084
1085         count = 0;
1086         i->host_attrs[count] = NULL;
1087
1088         count = 0;
1089         SETUP_PORT_ATTRIBUTE(initiator_port_protocols);
1090         SETUP_PORT_ATTRIBUTE(target_port_protocols);
1091         SETUP_PORT_ATTRIBUTE(device_type);
1092         SETUP_PORT_ATTRIBUTE(sas_address);
1093         SETUP_PORT_ATTRIBUTE(phy_identifier);
1094         SETUP_PORT_ATTRIBUTE(port_identifier);
1095         SETUP_PORT_ATTRIBUTE(negotiated_linkrate);
1096         SETUP_PORT_ATTRIBUTE(minimum_linkrate_hw);
1097         SETUP_PORT_ATTRIBUTE(minimum_linkrate);
1098         SETUP_PORT_ATTRIBUTE(maximum_linkrate_hw);
1099         SETUP_PORT_ATTRIBUTE(maximum_linkrate);
1100
1101         SETUP_PORT_ATTRIBUTE(invalid_dword_count);
1102         SETUP_PORT_ATTRIBUTE(running_disparity_error_count);
1103         SETUP_PORT_ATTRIBUTE(loss_of_dword_sync_count);
1104         SETUP_PORT_ATTRIBUTE(phy_reset_problem_count);
1105         SETUP_OPTIONAL_PORT_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1106         SETUP_OPTIONAL_PORT_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1107         i->phy_attrs[count] = NULL;
1108
1109         count = 0;
1110         SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1111         SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1112         SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1113         SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1114         SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1115         SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1116                                        get_enclosure_identifier);
1117         SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1118                                        get_bay_identifier);
1119         i->rphy_attrs[count] = NULL;
1120
1121         count = 0;
1122         SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1123         SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1124         SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1125         i->end_dev_attrs[count] = NULL;
1126
1127         count = 0;
1128         SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1129         SETUP_EXPANDER_ATTRIBUTE(product_id);
1130         SETUP_EXPANDER_ATTRIBUTE(product_rev);
1131         SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1132         SETUP_EXPANDER_ATTRIBUTE(component_id);
1133         SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1134         SETUP_EXPANDER_ATTRIBUTE(level);
1135         i->expander_attrs[count] = NULL;
1136
1137         return &i->t;
1138 }
1139 EXPORT_SYMBOL(sas_attach_transport);
1140
1141 /**
1142  * sas_release_transport  --  release SAS transport template instance
1143  * @t:          transport template instance
1144  */
1145 void sas_release_transport(struct scsi_transport_template *t)
1146 {
1147         struct sas_internal *i = to_sas_internal(t);
1148
1149         transport_container_unregister(&i->t.host_attrs);
1150         transport_container_unregister(&i->phy_attr_cont);
1151         transport_container_unregister(&i->rphy_attr_cont);
1152         transport_container_unregister(&i->end_dev_attr_cont);
1153         transport_container_unregister(&i->expander_attr_cont);
1154
1155         kfree(i);
1156 }
1157 EXPORT_SYMBOL(sas_release_transport);
1158
1159 static __init int sas_transport_init(void)
1160 {
1161         int error;
1162
1163         error = transport_class_register(&sas_host_class);
1164         if (error)
1165                 goto out;
1166         error = transport_class_register(&sas_phy_class);
1167         if (error)
1168                 goto out_unregister_transport;
1169         error = transport_class_register(&sas_rphy_class);
1170         if (error)
1171                 goto out_unregister_phy;
1172         error = transport_class_register(&sas_end_dev_class);
1173         if (error)
1174                 goto out_unregister_rphy;
1175         error = transport_class_register(&sas_expander_class);
1176         if (error)
1177                 goto out_unregister_end_dev;
1178
1179         return 0;
1180
1181  out_unregister_end_dev:
1182         transport_class_unregister(&sas_end_dev_class);
1183  out_unregister_rphy:
1184         transport_class_unregister(&sas_rphy_class);
1185  out_unregister_phy:
1186         transport_class_unregister(&sas_phy_class);
1187  out_unregister_transport:
1188         transport_class_unregister(&sas_host_class);
1189  out:
1190         return error;
1191
1192 }
1193
1194 static void __exit sas_transport_exit(void)
1195 {
1196         transport_class_unregister(&sas_host_class);
1197         transport_class_unregister(&sas_phy_class);
1198         transport_class_unregister(&sas_rphy_class);
1199         transport_class_unregister(&sas_end_dev_class);
1200         transport_class_unregister(&sas_expander_class);
1201 }
1202
1203 MODULE_AUTHOR("Christoph Hellwig");
1204 MODULE_DESCRIPTION("SAS Transphy Attributes");
1205 MODULE_LICENSE("GPL");
1206
1207 module_init(sas_transport_init);
1208 module_exit(sas_transport_exit);