git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/scsi_transport_sas.c

   1 /*
   2  * Copyright (C) 2005 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         5
  42
  43 struct sas_internal {
  44         struct scsi_transport_template t;
  45         struct sas_function_template *f;
  46
  47         struct class_device_attribute private_host_attrs[SAS_HOST_ATTRS];
  48         struct class_device_attribute private_phy_attrs[SAS_PORT_ATTRS];
  49         struct class_device_attribute private_rphy_attrs[SAS_RPORT_ATTRS];
  50
  51         struct transport_container phy_attr_cont;
  52         struct transport_container rphy_attr_cont;
  53
  54         /*
  55          * The array of null terminated pointers to attributes
  56          * needed by scsi_sysfs.c
  57          */
  58         struct class_device_attribute *host_attrs[SAS_HOST_ATTRS + 1];
  59         struct class_device_attribute *phy_attrs[SAS_PORT_ATTRS + 1];
  60         struct class_device_attribute *rphy_attrs[SAS_RPORT_ATTRS + 1];
  61 };
  62 #define to_sas_internal(tmpl)   container_of(tmpl, struct sas_internal, t)
  63
  64 struct sas_host_attrs {
  65         struct list_head rphy_list;
  66         struct mutex lock;
  67         u32 next_target_id;
  68 };
  69 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
  70
  71
  72 /*
  73  * Hack to allow attributes of the same name in different objects.
  74  */
  75 #define SAS_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  76         struct class_device_attribute class_device_attr_##_prefix##_##_name = \
  77         __ATTR(_name,_mode,_show,_store)
  78
  79
  80 /*
  81  * Pretty printing helpers
  82  */
  83
  84 #define sas_bitfield_name_match(title, table)                   \
  85 static ssize_t                                                  \
  86 get_sas_##title##_names(u32 table_key, char *buf)               \
  87 {                                                               \
  88         char *prefix = "";                                      \
  89         ssize_t len = 0;                                        \
  90         int i;                                                  \
  91                                                                 \
  92         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
  93                 if (table[i].value & table_key) {               \
  94                         len += sprintf(buf + len, "%s%s",       \
  95                                 prefix, table[i].name);         \
  96                         prefix = ", ";                          \
  97                 }                                               \
  98         }                                                       \
  99         len += sprintf(buf + len, "\n");                        \
 100         return len;                                             \
 101 }
 102
 103 #define sas_bitfield_name_search(title, table)                  \
 104 static ssize_t                                                  \
 105 get_sas_##title##_names(u32 table_key, char *buf)               \
 106 {                                                               \
 107         ssize_t len = 0;                                        \
 108         int i;                                                  \
 109                                                                 \
 110         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
 111                 if (table[i].value == table_key) {              \
 112                         len += sprintf(buf + len, "%s",         \
 113                                 table[i].name);                 \
 114                         break;                                  \
 115                 }                                               \
 116         }                                                       \
 117         len += sprintf(buf + len, "\n");                        \
 118         return len;                                             \
 119 }
 120
 121 static struct {
 122         u32             value;
 123         char            *name;
 124 } sas_device_type_names[] = {
 125         { SAS_PHY_UNUSED,               "unused" },
 126         { SAS_END_DEVICE,               "end device" },
 127         { SAS_EDGE_EXPANDER_DEVICE,     "edge expander" },
 128         { SAS_FANOUT_EXPANDER_DEVICE,   "fanout expander" },
 129 };
 130 sas_bitfield_name_search(device_type, sas_device_type_names)
 131
 132
 133 static struct {
 134         u32             value;
 135         char            *name;
 136 } sas_protocol_names[] = {
 137         { SAS_PROTOCOL_SATA,            "sata" },
 138         { SAS_PROTOCOL_SMP,             "smp" },
 139         { SAS_PROTOCOL_STP,             "stp" },
 140         { SAS_PROTOCOL_SSP,             "ssp" },
 141 };
 142 sas_bitfield_name_match(protocol, sas_protocol_names)
 143
 144 static struct {
 145         u32             value;
 146         char            *name;
 147 } sas_linkspeed_names[] = {
 148         { SAS_LINK_RATE_UNKNOWN,        "Unknown" },
 149         { SAS_PHY_DISABLED,             "Phy disabled" },
 150         { SAS_LINK_RATE_FAILED,         "Link Rate failed" },
 151         { SAS_SATA_SPINUP_HOLD,         "Spin-up hold" },
 152         { SAS_LINK_RATE_1_5_GBPS,       "1.5 Gbit" },
 153         { SAS_LINK_RATE_3_0_GBPS,       "3.0 Gbit" },
 154 };
 155 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 156
 157
 158 /*
 159  * SAS host attributes
 160  */
 161
 162 static int sas_host_setup(struct transport_container *tc, struct device *dev,
 163                           struct class_device *cdev)
 164 {
 165         struct Scsi_Host *shost = dev_to_shost(dev);
 166         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 167
 168         INIT_LIST_HEAD(&sas_host->rphy_list);
 169         mutex_init(&sas_host->lock);
 170         sas_host->next_target_id = 0;
 171         return 0;
 172 }
 173
 174 static DECLARE_TRANSPORT_CLASS(sas_host_class,
 175                 "sas_host", sas_host_setup, NULL, NULL);
 176
 177 static int sas_host_match(struct attribute_container *cont,
 178                             struct device *dev)
 179 {
 180         struct Scsi_Host *shost;
 181         struct sas_internal *i;
 182
 183         if (!scsi_is_host_device(dev))
 184                 return 0;
 185         shost = dev_to_shost(dev);
 186
 187         if (!shost->transportt)
 188                 return 0;
 189         if (shost->transportt->host_attrs.ac.class !=
 190                         &sas_host_class.class)
 191                 return 0;
 192
 193         i = to_sas_internal(shost->transportt);
 194         return &i->t.host_attrs.ac == cont;
 195 }
 196
 197 static int do_sas_phy_delete(struct device *dev, void *data)
 198 {
 199         if (scsi_is_sas_phy(dev))
 200                 sas_phy_delete(dev_to_phy(dev));
 201         return 0;
 202 }
 203
 204 /**
 205  * sas_remove_host  --  tear down a Scsi_Host's SAS data structures
 206  * @shost:      Scsi Host that is torn down
 207  *
 208  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
 209  * Must be called just before scsi_remove_host for SAS HBAs.
 210  */
 211 void sas_remove_host(struct Scsi_Host *shost)
 212 {
 213         device_for_each_child(&shost->shost_gendev, NULL, do_sas_phy_delete);
 214 }
 215 EXPORT_SYMBOL(sas_remove_host);
 216
 217
 218 /*
 219  * SAS Port attributes
 220  */
 221
 222 #define sas_phy_show_simple(field, name, format_string, cast)           \
 223 static ssize_t                                                          \
 224 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
 225 {                                                                       \
 226         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 227                                                                         \
 228         return snprintf(buf, 20, format_string, cast phy->field);       \
 229 }
 230
 231 #define sas_phy_simple_attr(field, name, format_string, type)           \
 232         sas_phy_show_simple(field, name, format_string, (type)) \
 233 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 234
 235 #define sas_phy_show_protocol(field, name)                              \
 236 static ssize_t                                                          \
 237 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
 238 {                                                                       \
 239         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 240                                                                         \
 241         if (!phy->field)                                                \
 242                 return snprintf(buf, 20, "none\n");                     \
 243         return get_sas_protocol_names(phy->field, buf);         \
 244 }
 245
 246 #define sas_phy_protocol_attr(field, name)                              \
 247         sas_phy_show_protocol(field, name)                              \
 248 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 249
 250 #define sas_phy_show_linkspeed(field)                                   \
 251 static ssize_t                                                          \
 252 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
 253 {                                                                       \
 254         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 255                                                                         \
 256         return get_sas_linkspeed_names(phy->field, buf);                \
 257 }
 258
 259 #define sas_phy_linkspeed_attr(field)                                   \
 260         sas_phy_show_linkspeed(field)                                   \
 261 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 262
 263 #define sas_phy_show_linkerror(field)                                   \
 264 static ssize_t                                                          \
 265 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
 266 {                                                                       \
 267         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 268         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 269         struct sas_internal *i = to_sas_internal(shost->transportt);    \
 270         int error;                                                      \
 271                                                                         \
 272         if (!phy->local_attached)                                       \
 273                 return -EINVAL;                                         \
 274                                                                         \
 275         error = i->f->get_linkerrors(phy);                              \
 276         if (error)                                                      \
 277                 return error;                                           \
 278         return snprintf(buf, 20, "%u\n", phy->field);                   \
 279 }
 280
 281 #define sas_phy_linkerror_attr(field)                                   \
 282         sas_phy_show_linkerror(field)                                   \
 283 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 284
 285
 286 static ssize_t
 287 show_sas_device_type(struct class_device *cdev, char *buf)
 288 {
 289         struct sas_phy *phy = transport_class_to_phy(cdev);
 290
 291         if (!phy->identify.device_type)
 292                 return snprintf(buf, 20, "none\n");
 293         return get_sas_device_type_names(phy->identify.device_type, buf);
 294 }
 295 static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 296
 297 static ssize_t do_sas_phy_reset(struct class_device *cdev,
 298                 size_t count, int hard_reset)
 299 {
 300         struct sas_phy *phy = transport_class_to_phy(cdev);
 301         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 302         struct sas_internal *i = to_sas_internal(shost->transportt);
 303         int error;
 304
 305         if (!phy->local_attached)
 306                 return -EINVAL;
 307
 308         error = i->f->phy_reset(phy, hard_reset);
 309         if (error)
 310                 return error;
 311         return count;
 312 };
 313
 314 static ssize_t store_sas_link_reset(struct class_device *cdev,
 315                 const char *buf, size_t count)
 316 {
 317         return do_sas_phy_reset(cdev, count, 0);
 318 }
 319 static CLASS_DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 320
 321 static ssize_t store_sas_hard_reset(struct class_device *cdev,
 322                 const char *buf, size_t count)
 323 {
 324         return do_sas_phy_reset(cdev, count, 1);
 325 }
 326 static CLASS_DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 327
 328 sas_phy_protocol_attr(identify.initiator_port_protocols,
 329                 initiator_port_protocols);
 330 sas_phy_protocol_attr(identify.target_port_protocols,
 331                 target_port_protocols);
 332 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 333                 unsigned long long);
 334 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 335 sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", u8);
 336 sas_phy_linkspeed_attr(negotiated_linkrate);
 337 sas_phy_linkspeed_attr(minimum_linkrate_hw);
 338 sas_phy_linkspeed_attr(minimum_linkrate);
 339 sas_phy_linkspeed_attr(maximum_linkrate_hw);
 340 sas_phy_linkspeed_attr(maximum_linkrate);
 341 sas_phy_linkerror_attr(invalid_dword_count);
 342 sas_phy_linkerror_attr(running_disparity_error_count);
 343 sas_phy_linkerror_attr(loss_of_dword_sync_count);
 344 sas_phy_linkerror_attr(phy_reset_problem_count);
 345
 346
 347 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 348                 "sas_phy", NULL, NULL, NULL);
 349
 350 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 351 {
 352         struct Scsi_Host *shost;
 353         struct sas_internal *i;
 354
 355         if (!scsi_is_sas_phy(dev))
 356                 return 0;
 357         shost = dev_to_shost(dev->parent);
 358
 359         if (!shost->transportt)
 360                 return 0;
 361         if (shost->transportt->host_attrs.ac.class !=
 362                         &sas_host_class.class)
 363                 return 0;
 364
 365         i = to_sas_internal(shost->transportt);
 366         return &i->phy_attr_cont.ac == cont;
 367 }
 368
 369 static void sas_phy_release(struct device *dev)
 370 {
 371         struct sas_phy *phy = dev_to_phy(dev);
 372
 373         put_device(dev->parent);
 374         kfree(phy);
 375 }
 376
 377 /**
 378  * sas_phy_alloc  --  allocates and initialize a SAS PHY structure
 379  * @parent:     Parent device
 380  * @number:     Port number
 381  *
 382  * Allocates an SAS PHY structure.  It will be added in the device tree
 383  * below the device specified by @parent, which has to be either a Scsi_Host
 384  * or sas_rphy.
 385  *
 386  * Returns:
 387  *      SAS PHY allocated or %NULL if the allocation failed.
 388  */
 389 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 390 {
 391         struct Scsi_Host *shost = dev_to_shost(parent);
 392         struct sas_phy *phy;
 393
 394         phy = kmalloc(sizeof(*phy), GFP_KERNEL);
 395         if (!phy)
 396                 return NULL;
 397         memset(phy, 0, sizeof(*phy));
 398
 399         get_device(parent);
 400
 401         phy->number = number;
 402
 403         device_initialize(&phy->dev);
 404         phy->dev.parent = get_device(parent);
 405         phy->dev.release = sas_phy_release;
 406         sprintf(phy->dev.bus_id, "phy-%d:%d", shost->host_no, number);
 407
 408         transport_setup_device(&phy->dev);
 409
 410         return phy;
 411 }
 412 EXPORT_SYMBOL(sas_phy_alloc);
 413
 414 /**
 415  * sas_phy_add  --  add a SAS PHY to the device hierachy
 416  * @phy:        The PHY to be added
 417  *
 418  * Publishes a SAS PHY to the rest of the system.
 419  */
 420 int sas_phy_add(struct sas_phy *phy)
 421 {
 422         int error;
 423
 424         error = device_add(&phy->dev);
 425         if (!error) {
 426                 transport_add_device(&phy->dev);
 427                 transport_configure_device(&phy->dev);
 428         }
 429
 430         return error;
 431 }
 432 EXPORT_SYMBOL(sas_phy_add);
 433
 434 /**
 435  * sas_phy_free  --  free a SAS PHY
 436  * @phy:        SAS PHY to free
 437  *
 438  * Frees the specified SAS PHY.
 439  *
 440  * Note:
 441  *   This function must only be called on a PHY that has not
 442  *   sucessfully been added using sas_phy_add().
 443  */
 444 void sas_phy_free(struct sas_phy *phy)
 445 {
 446         transport_destroy_device(&phy->dev);
 447         put_device(phy->dev.parent);
 448         put_device(phy->dev.parent);
 449         put_device(phy->dev.parent);
 450         kfree(phy);
 451 }
 452 EXPORT_SYMBOL(sas_phy_free);
 453
 454 /**
 455  * sas_phy_delete  --  remove SAS PHY
 456  * @phy:        SAS PHY to remove
 457  *
 458  * Removes the specified SAS PHY.  If the SAS PHY has an
 459  * associated remote PHY it is removed before.
 460  */
 461 void
 462 sas_phy_delete(struct sas_phy *phy)
 463 {
 464         struct device *dev = &phy->dev;
 465
 466         if (phy->rphy)
 467                 sas_rphy_delete(phy->rphy);
 468
 469         transport_remove_device(dev);
 470         device_del(dev);
 471         transport_destroy_device(dev);
 472         put_device(dev->parent);
 473 }
 474 EXPORT_SYMBOL(sas_phy_delete);
 475
 476 /**
 477  * scsi_is_sas_phy  --  check if a struct device represents a SAS PHY
 478  * @dev:        device to check
 479  *
 480  * Returns:
 481  *      %1 if the device represents a SAS PHY, %0 else
 482  */
 483 int scsi_is_sas_phy(const struct device *dev)
 484 {
 485         return dev->release == sas_phy_release;
 486 }
 487 EXPORT_SYMBOL(scsi_is_sas_phy);
 488
 489 /*
 490  * SAS remote PHY attributes.
 491  */
 492
 493 #define sas_rphy_show_simple(field, name, format_string, cast)          \
 494 static ssize_t                                                          \
 495 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
 496 {                                                                       \
 497         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
 498                                                                         \
 499         return snprintf(buf, 20, format_string, cast rphy->field);      \
 500 }
 501
 502 #define sas_rphy_simple_attr(field, name, format_string, type)          \
 503         sas_rphy_show_simple(field, name, format_string, (type))        \
 504 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
 505                 show_sas_rphy_##name, NULL)
 506
 507 #define sas_rphy_show_protocol(field, name)                             \
 508 static ssize_t                                                          \
 509 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
 510 {                                                                       \
 511         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
 512                                                                         \
 513         if (!rphy->field)                                       \
 514                 return snprintf(buf, 20, "none\n");                     \
 515         return get_sas_protocol_names(rphy->field, buf);        \
 516 }
 517
 518 #define sas_rphy_protocol_attr(field, name)                             \
 519         sas_rphy_show_protocol(field, name)                             \
 520 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
 521                 show_sas_rphy_##name, NULL)
 522
 523 static ssize_t
 524 show_sas_rphy_device_type(struct class_device *cdev, char *buf)
 525 {
 526         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
 527
 528         if (!rphy->identify.device_type)
 529                 return snprintf(buf, 20, "none\n");
 530         return get_sas_device_type_names(
 531                         rphy->identify.device_type, buf);
 532 }
 533
 534 static SAS_CLASS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
 535                 show_sas_rphy_device_type, NULL);
 536
 537 sas_rphy_protocol_attr(identify.initiator_port_protocols,
 538                 initiator_port_protocols);
 539 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
 540 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 541                 unsigned long long);
 542 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 543
 544 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
 545                 "sas_rphy", NULL, NULL, NULL);
 546
 547 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
 548 {
 549         struct Scsi_Host *shost;
 550         struct sas_internal *i;
 551
 552         if (!scsi_is_sas_rphy(dev))
 553                 return 0;
 554         shost = dev_to_shost(dev->parent->parent);
 555
 556         if (!shost->transportt)
 557                 return 0;
 558         if (shost->transportt->host_attrs.ac.class !=
 559                         &sas_host_class.class)
 560                 return 0;
 561
 562         i = to_sas_internal(shost->transportt);
 563         return &i->rphy_attr_cont.ac == cont;
 564 }
 565
 566 static void sas_rphy_release(struct device *dev)
 567 {
 568         struct sas_rphy *rphy = dev_to_rphy(dev);
 569
 570         put_device(dev->parent);
 571         kfree(rphy);
 572 }
 573
 574 /**
 575  * sas_rphy_alloc  --  allocates and initialize a SAS remote PHY structure
 576  * @parent:             SAS PHY this remote PHY is conneted to
 577  *
 578  * Allocates an SAS remote PHY structure, connected to @parent.
 579  *
 580  * Returns:
 581  *      SAS PHY allocated or %NULL if the allocation failed.
 582  */
 583 struct sas_rphy *sas_rphy_alloc(struct sas_phy *parent)
 584 {
 585         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
 586         struct sas_rphy *rphy;
 587
 588         rphy = kmalloc(sizeof(*rphy), GFP_KERNEL);
 589         if (!rphy) {
 590                 put_device(&parent->dev);
 591                 return NULL;
 592         }
 593         memset(rphy, 0, sizeof(*rphy));
 594
 595         device_initialize(&rphy->dev);
 596         rphy->dev.parent = get_device(&parent->dev);
 597         rphy->dev.release = sas_rphy_release;
 598         sprintf(rphy->dev.bus_id, "rphy-%d:%d",
 599                 shost->host_no, parent->number);
 600         transport_setup_device(&rphy->dev);
 601
 602         return rphy;
 603 }
 604 EXPORT_SYMBOL(sas_rphy_alloc);
 605
 606 /**
 607  * sas_rphy_add  --  add a SAS remote PHY to the device hierachy
 608  * @rphy:       The remote PHY to be added
 609  *
 610  * Publishes a SAS remote PHY to the rest of the system.
 611  */
 612 int sas_rphy_add(struct sas_rphy *rphy)
 613 {
 614         struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
 615         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
 616         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 617         struct sas_identify *identify = &rphy->identify;
 618         int error;
 619
 620         if (parent->rphy)
 621                 return -ENXIO;
 622         parent->rphy = rphy;
 623
 624         error = device_add(&rphy->dev);
 625         if (error)
 626                 return error;
 627         transport_add_device(&rphy->dev);
 628         transport_configure_device(&rphy->dev);
 629
 630         mutex_lock(&sas_host->lock);
 631         list_add_tail(&rphy->list, &sas_host->rphy_list);
 632         if (identify->device_type == SAS_END_DEVICE &&
 633             (identify->target_port_protocols &
 634              (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
 635                 rphy->scsi_target_id = sas_host->next_target_id++;
 636         else
 637                 rphy->scsi_target_id = -1;
 638         mutex_unlock(&sas_host->lock);
 639
 640         if (rphy->scsi_target_id != -1) {
 641                 scsi_scan_target(&rphy->dev, parent->port_identifier,
 642                                 rphy->scsi_target_id, ~0, 0);
 643         }
 644
 645         return 0;
 646 }
 647 EXPORT_SYMBOL(sas_rphy_add);
 648
 649 /**
 650  * sas_rphy_free  --  free a SAS remote PHY
 651  * @rphy        SAS remote PHY to free
 652  *
 653  * Frees the specified SAS remote PHY.
 654  *
 655  * Note:
 656  *   This function must only be called on a remote
 657  *   PHY that has not sucessfully been added using
 658  *   sas_rphy_add().
 659  */
 660 void sas_rphy_free(struct sas_rphy *rphy)
 661 {
 662         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
 663         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 664
 665         mutex_lock(&sas_host->lock);
 666         list_del(&rphy->list);
 667         mutex_unlock(&sas_host->lock);
 668
 669         transport_destroy_device(&rphy->dev);
 670         put_device(rphy->dev.parent);
 671         put_device(rphy->dev.parent);
 672         put_device(rphy->dev.parent);
 673         kfree(rphy);
 674 }
 675 EXPORT_SYMBOL(sas_rphy_free);
 676
 677 /**
 678  * sas_rphy_delete  --  remove SAS remote PHY
 679  * @rphy:       SAS remote PHY to remove
 680  *
 681  * Removes the specified SAS remote PHY.
 682  */
 683 void
 684 sas_rphy_delete(struct sas_rphy *rphy)
 685 {
 686         struct device *dev = &rphy->dev;
 687         struct sas_phy *parent = dev_to_phy(dev->parent);
 688         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
 689         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 690
 691         switch (rphy->identify.device_type) {
 692         case SAS_END_DEVICE:
 693                 scsi_remove_target(dev);
 694                 break;
 695         case SAS_EDGE_EXPANDER_DEVICE:
 696         case SAS_FANOUT_EXPANDER_DEVICE:
 697                 device_for_each_child(dev, NULL, do_sas_phy_delete);
 698                 break;
 699         default:
 700                 break;
 701         }
 702
 703         transport_remove_device(dev);
 704         device_del(dev);
 705         transport_destroy_device(dev);
 706
 707         mutex_lock(&sas_host->lock);
 708         list_del(&rphy->list);
 709         mutex_unlock(&sas_host->lock);
 710
 711         parent->rphy = NULL;
 712
 713         put_device(&parent->dev);
 714 }
 715 EXPORT_SYMBOL(sas_rphy_delete);
 716
 717 /**
 718  * scsi_is_sas_rphy  --  check if a struct device represents a SAS remote PHY
 719  * @dev:        device to check
 720  *
 721  * Returns:
 722  *      %1 if the device represents a SAS remote PHY, %0 else
 723  */
 724 int scsi_is_sas_rphy(const struct device *dev)
 725 {
 726         return dev->release == sas_rphy_release;
 727 }
 728 EXPORT_SYMBOL(scsi_is_sas_rphy);
 729
 730
 731 /*
 732  * SCSI scan helper
 733  */
 734
 735 static int sas_user_scan(struct Scsi_Host *shost, uint channel,
 736                 uint id, uint lun)
 737 {
 738         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 739         struct sas_rphy *rphy;
 740
 741         mutex_lock(&sas_host->lock);
 742         list_for_each_entry(rphy, &sas_host->rphy_list, list) {
 743                 struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
 744
 745                 if (rphy->scsi_target_id == -1)
 746                         continue;
 747
 748                 if ((channel == SCAN_WILD_CARD || channel == parent->port_identifier) &&
 749                     (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
 750                         scsi_scan_target(&rphy->dev, parent->port_identifier,
 751                                          rphy->scsi_target_id, lun, 1);
 752                 }
 753         }
 754         mutex_unlock(&sas_host->lock);
 755
 756         return 0;
 757 }
 758
 759
 760 /*
 761  * Setup / Teardown code
 762  */
 763
 764 #define SETUP_RPORT_ATTRIBUTE(field)                                    \
 765         i->private_rphy_attrs[count] = class_device_attr_##field;       \
 766         i->private_rphy_attrs[count].attr.mode = S_IRUGO;               \
 767         i->private_rphy_attrs[count].store = NULL;                      \
 768         i->rphy_attrs[count] = &i->private_rphy_attrs[count];   \
 769         count++
 770
 771 #define SETUP_PORT_ATTRIBUTE(field)                                     \
 772         i->private_phy_attrs[count] = class_device_attr_##field;        \
 773         i->private_phy_attrs[count].attr.mode = S_IRUGO;                \
 774         i->private_phy_attrs[count].store = NULL;                       \
 775         i->phy_attrs[count] = &i->private_phy_attrs[count];             \
 776         count++
 777
 778 #define SETUP_PORT_ATTRIBUTE_WRONLY(field)                              \
 779         i->private_phy_attrs[count] = class_device_attr_##field;        \
 780         i->private_phy_attrs[count].attr.mode = S_IWUGO;                \
 781         i->private_phy_attrs[count].show = NULL;                        \
 782         i->phy_attrs[count] = &i->private_phy_attrs[count];             \
 783         count++
 784
 785
 786 /**
 787  * sas_attach_transport  --  instantiate SAS transport template
 788  * @ft:         SAS transport class function template
 789  */
 790 struct scsi_transport_template *
 791 sas_attach_transport(struct sas_function_template *ft)
 792 {
 793         struct sas_internal *i;
 794         int count;
 795
 796         i = kmalloc(sizeof(struct sas_internal), GFP_KERNEL);
 797         if (!i)
 798                 return NULL;
 799         memset(i, 0, sizeof(struct sas_internal));
 800
 801         i->t.user_scan = sas_user_scan;
 802
 803         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
 804         i->t.host_attrs.ac.class = &sas_host_class.class;
 805         i->t.host_attrs.ac.match = sas_host_match;
 806         transport_container_register(&i->t.host_attrs);
 807         i->t.host_size = sizeof(struct sas_host_attrs);
 808
 809         i->phy_attr_cont.ac.class = &sas_phy_class.class;
 810         i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
 811         i->phy_attr_cont.ac.match = sas_phy_match;
 812         transport_container_register(&i->phy_attr_cont);
 813
 814         i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
 815         i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
 816         i->rphy_attr_cont.ac.match = sas_rphy_match;
 817         transport_container_register(&i->rphy_attr_cont);
 818
 819         i->f = ft;
 820
 821         count = 0;
 822         i->host_attrs[count] = NULL;
 823
 824         count = 0;
 825         SETUP_PORT_ATTRIBUTE(initiator_port_protocols);
 826         SETUP_PORT_ATTRIBUTE(target_port_protocols);
 827         SETUP_PORT_ATTRIBUTE(device_type);
 828         SETUP_PORT_ATTRIBUTE(sas_address);
 829         SETUP_PORT_ATTRIBUTE(phy_identifier);
 830         SETUP_PORT_ATTRIBUTE(port_identifier);
 831         SETUP_PORT_ATTRIBUTE(negotiated_linkrate);
 832         SETUP_PORT_ATTRIBUTE(minimum_linkrate_hw);
 833         SETUP_PORT_ATTRIBUTE(minimum_linkrate);
 834         SETUP_PORT_ATTRIBUTE(maximum_linkrate_hw);
 835         SETUP_PORT_ATTRIBUTE(maximum_linkrate);
 836
 837         SETUP_PORT_ATTRIBUTE(invalid_dword_count);
 838         SETUP_PORT_ATTRIBUTE(running_disparity_error_count);
 839         SETUP_PORT_ATTRIBUTE(loss_of_dword_sync_count);
 840         SETUP_PORT_ATTRIBUTE(phy_reset_problem_count);
 841         SETUP_PORT_ATTRIBUTE_WRONLY(link_reset);
 842         SETUP_PORT_ATTRIBUTE_WRONLY(hard_reset);
 843         i->phy_attrs[count] = NULL;
 844
 845         count = 0;
 846         SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
 847         SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
 848         SETUP_RPORT_ATTRIBUTE(rphy_device_type);
 849         SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
 850         SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
 851         i->rphy_attrs[count] = NULL;
 852
 853         return &i->t;
 854 }
 855 EXPORT_SYMBOL(sas_attach_transport);
 856
 857 /**
 858  * sas_release_transport  --  release SAS transport template instance
 859  * @t:          transport template instance
 860  */
 861 void sas_release_transport(struct scsi_transport_template *t)
 862 {
 863         struct sas_internal *i = to_sas_internal(t);
 864
 865         transport_container_unregister(&i->t.host_attrs);
 866         transport_container_unregister(&i->phy_attr_cont);
 867         transport_container_unregister(&i->rphy_attr_cont);
 868
 869         kfree(i);
 870 }
 871 EXPORT_SYMBOL(sas_release_transport);
 872
 873 static __init int sas_transport_init(void)
 874 {
 875         int error;
 876
 877         error = transport_class_register(&sas_host_class);
 878         if (error)
 879                 goto out;
 880         error = transport_class_register(&sas_phy_class);
 881         if (error)
 882                 goto out_unregister_transport;
 883         error = transport_class_register(&sas_rphy_class);
 884         if (error)
 885                 goto out_unregister_phy;
 886
 887         return 0;
 888
 889  out_unregister_phy:
 890         transport_class_unregister(&sas_phy_class);
 891  out_unregister_transport:
 892         transport_class_unregister(&sas_host_class);
 893  out:
 894         return error;
 895
 896 }
 897
 898 static void __exit sas_transport_exit(void)
 899 {
 900         transport_class_unregister(&sas_host_class);
 901         transport_class_unregister(&sas_phy_class);
 902         transport_class_unregister(&sas_rphy_class);
 903 }
 904
 905 MODULE_AUTHOR("Christoph Hellwig");
 906 MODULE_DESCRIPTION("SAS Transphy Attributes");
 907 MODULE_LICENSE("GPL");
 908
 909 module_init(sas_transport_init);
 910 module_exit(sas_transport_exit);