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_device.h>
  33 #include <scsi/scsi_host.h>
  34 #include <scsi/scsi_transport.h>
  35 #include <scsi/scsi_transport_sas.h>
  36
  37
  38 #define SAS_HOST_ATTRS          0
  39 #define SAS_PORT_ATTRS          17
  40 #define SAS_RPORT_ATTRS         5
  41
  42 struct sas_internal {
  43         struct scsi_transport_template t;
  44         struct sas_function_template *f;
  45
  46         struct class_device_attribute private_host_attrs[SAS_HOST_ATTRS];
  47         struct class_device_attribute private_phy_attrs[SAS_PORT_ATTRS];
  48         struct class_device_attribute private_rphy_attrs[SAS_RPORT_ATTRS];
  49
  50         struct transport_container phy_attr_cont;
  51         struct transport_container rphy_attr_cont;
  52
  53         /*
  54          * The array of null terminated pointers to attributes
  55          * needed by scsi_sysfs.c
  56          */
  57         struct class_device_attribute *host_attrs[SAS_HOST_ATTRS + 1];
  58         struct class_device_attribute *phy_attrs[SAS_PORT_ATTRS + 1];
  59         struct class_device_attribute *rphy_attrs[SAS_RPORT_ATTRS + 1];
  60 };
  61 #define to_sas_internal(tmpl)   container_of(tmpl, struct sas_internal, t)
  62
  63 struct sas_host_attrs {
  64         struct list_head rphy_list;
  65         spinlock_t lock;
  66         u32 next_target_id;
  67 };
  68 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
  69
  70
  71 /*
  72  * Hack to allow attributes of the same name in different objects.
  73  */
  74 #define SAS_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  75         struct class_device_attribute class_device_attr_##_prefix##_##_name = \
  76         __ATTR(_name,_mode,_show,_store)
  77
  78
  79 /*
  80  * Pretty printing helpers
  81  */
  82
  83 #define sas_bitfield_name_match(title, table)                   \
  84 static ssize_t                                                  \
  85 get_sas_##title##_names(u32 table_key, char *buf)               \
  86 {                                                               \
  87         char *prefix = "";                                      \
  88         ssize_t len = 0;                                        \
  89         int i;                                                  \
  90                                                                 \
  91         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
  92                 if (table[i].value & table_key) {               \
  93                         len += sprintf(buf + len, "%s%s",       \
  94                                 prefix, table[i].name);         \
  95                         prefix = ", ";                          \
  96                 }                                               \
  97         }                                                       \
  98         len += sprintf(buf + len, "\n");                        \
  99         return len;                                             \
 100 }
 101
 102 #define sas_bitfield_name_search(title, table)                  \
 103 static ssize_t                                                  \
 104 get_sas_##title##_names(u32 table_key, char *buf)               \
 105 {                                                               \
 106         ssize_t len = 0;                                        \
 107         int i;                                                  \
 108                                                                 \
 109         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
 110                 if (table[i].value == table_key) {              \
 111                         len += sprintf(buf + len, "%s",         \
 112                                 table[i].name);                 \
 113                         break;                                  \
 114                 }                                               \
 115         }                                                       \
 116         len += sprintf(buf + len, "\n");                        \
 117         return len;                                             \
 118 }
 119
 120 static struct {
 121         u32             value;
 122         char            *name;
 123 } sas_device_type_names[] = {
 124         { SAS_PHY_UNUSED,               "unused" },
 125         { SAS_END_DEVICE,               "end device" },
 126         { SAS_EDGE_EXPANDER_DEVICE,     "edge expander" },
 127         { SAS_FANOUT_EXPANDER_DEVICE,   "fanout expander" },
 128 };
 129 sas_bitfield_name_search(device_type, sas_device_type_names)
 130
 131
 132 static struct {
 133         u32             value;
 134         char            *name;
 135 } sas_protocol_names[] = {
 136         { SAS_PROTOCOL_SATA,            "sata" },
 137         { SAS_PROTOCOL_SMP,             "smp" },
 138         { SAS_PROTOCOL_STP,             "stp" },
 139         { SAS_PROTOCOL_SSP,             "ssp" },
 140 };
 141 sas_bitfield_name_match(protocol, sas_protocol_names)
 142
 143 static struct {
 144         u32             value;
 145         char            *name;
 146 } sas_linkspeed_names[] = {
 147         { SAS_LINK_RATE_UNKNOWN,        "Unknown" },
 148         { SAS_PHY_DISABLED,             "Phy disabled" },
 149         { SAS_LINK_RATE_FAILED,         "Link Rate failed" },
 150         { SAS_SATA_SPINUP_HOLD,         "Spin-up hold" },
 151         { SAS_LINK_RATE_1_5_GBPS,       "1.5 Gbit" },
 152         { SAS_LINK_RATE_3_0_GBPS,       "3.0 Gbit" },
 153 };
 154 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 155
 156
 157 /*
 158  * SAS host attributes
 159  */
 160
 161 static int sas_host_setup(struct transport_container *tc, struct device *dev,
 162                           struct class_device *cdev)
 163 {
 164         struct Scsi_Host *shost = dev_to_shost(dev);
 165         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 166
 167         INIT_LIST_HEAD(&sas_host->rphy_list);
 168         spin_lock_init(&sas_host->lock);
 169         sas_host->next_target_id = 0;
 170         return 0;
 171 }
 172
 173 static DECLARE_TRANSPORT_CLASS(sas_host_class,
 174                 "sas_host", sas_host_setup, NULL, NULL);
 175
 176 static int sas_host_match(struct attribute_container *cont,
 177                             struct device *dev)
 178 {
 179         struct Scsi_Host *shost;
 180         struct sas_internal *i;
 181
 182         if (!scsi_is_host_device(dev))
 183                 return 0;
 184         shost = dev_to_shost(dev);
 185
 186         if (!shost->transportt)
 187                 return 0;
 188         if (shost->transportt->host_attrs.ac.class !=
 189                         &sas_host_class.class)
 190                 return 0;
 191
 192         i = to_sas_internal(shost->transportt);
 193         return &i->t.host_attrs.ac == cont;
 194 }
 195
 196 static int do_sas_phy_delete(struct device *dev, void *data)
 197 {
 198         if (scsi_is_sas_phy(dev))
 199                 sas_phy_delete(dev_to_phy(dev));
 200         return 0;
 201 }
 202
 203 /**
 204  * sas_remove_host  --  tear down a Scsi_Host's SAS data structures
 205  * @shost:      Scsi Host that is torn down
 206  *
 207  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
 208  * Must be called just before scsi_remove_host for SAS HBAs.
 209  */
 210 void sas_remove_host(struct Scsi_Host *shost)
 211 {
 212         device_for_each_child(&shost->shost_gendev, NULL, do_sas_phy_delete);
 213 }
 214 EXPORT_SYMBOL(sas_remove_host);
 215
 216
 217 /*
 218  * SAS Port attributes
 219  */
 220
 221 #define sas_phy_show_simple(field, name, format_string, cast)           \
 222 static ssize_t                                                          \
 223 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
 224 {                                                                       \
 225         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 226                                                                         \
 227         return snprintf(buf, 20, format_string, cast phy->field);       \
 228 }
 229
 230 #define sas_phy_simple_attr(field, name, format_string, type)           \
 231         sas_phy_show_simple(field, name, format_string, (type)) \
 232 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 233
 234 #define sas_phy_show_protocol(field, name)                              \
 235 static ssize_t                                                          \
 236 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
 237 {                                                                       \
 238         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 239                                                                         \
 240         if (!phy->field)                                                \
 241                 return snprintf(buf, 20, "none\n");                     \
 242         return get_sas_protocol_names(phy->field, buf);         \
 243 }
 244
 245 #define sas_phy_protocol_attr(field, name)                              \
 246         sas_phy_show_protocol(field, name)                              \
 247 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 248
 249 #define sas_phy_show_linkspeed(field)                                   \
 250 static ssize_t                                                          \
 251 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
 252 {                                                                       \
 253         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 254                                                                         \
 255         return get_sas_linkspeed_names(phy->field, buf);                \
 256 }
 257
 258 #define sas_phy_linkspeed_attr(field)                                   \
 259         sas_phy_show_linkspeed(field)                                   \
 260 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 261
 262 #define sas_phy_show_linkerror(field)                                   \
 263 static ssize_t                                                          \
 264 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
 265 {                                                                       \
 266         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 267         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 268         struct sas_internal *i = to_sas_internal(shost->transportt);    \
 269         int error;                                                      \
 270                                                                         \
 271         if (!phy->local_attached)                                       \
 272                 return -EINVAL;                                         \
 273                                                                         \
 274         error = i->f->get_linkerrors(phy);                              \
 275         if (error)                                                      \
 276                 return error;                                           \
 277         return snprintf(buf, 20, "%u\n", phy->field);                   \
 278 }
 279
 280 #define sas_phy_linkerror_attr(field)                                   \
 281         sas_phy_show_linkerror(field)                                   \
 282 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 283
 284
 285 static ssize_t
 286 show_sas_device_type(struct class_device *cdev, char *buf)
 287 {
 288         struct sas_phy *phy = transport_class_to_phy(cdev);
 289
 290         if (!phy->identify.device_type)
 291                 return snprintf(buf, 20, "none\n");
 292         return get_sas_device_type_names(phy->identify.device_type, buf);
 293 }
 294 static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 295
 296 static ssize_t do_sas_phy_reset(struct class_device *cdev,
 297                 size_t count, int hard_reset)
 298 {
 299         struct sas_phy *phy = transport_class_to_phy(cdev);
 300         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 301         struct sas_internal *i = to_sas_internal(shost->transportt);
 302         int error;
 303
 304         if (!phy->local_attached)
 305                 return -EINVAL;
 306
 307         error = i->f->phy_reset(phy, hard_reset);
 308         if (error)
 309                 return error;
 310         return count;
 311 };
 312
 313 static ssize_t store_sas_link_reset(struct class_device *cdev,
 314                 const char *buf, size_t count)
 315 {
 316         return do_sas_phy_reset(cdev, count, 0);
 317 }
 318 static CLASS_DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 319
 320 static ssize_t store_sas_hard_reset(struct class_device *cdev,
 321                 const char *buf, size_t count)
 322 {
 323         return do_sas_phy_reset(cdev, count, 1);
 324 }
 325 static CLASS_DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 326
 327 sas_phy_protocol_attr(identify.initiator_port_protocols,
 328                 initiator_port_protocols);
 329 sas_phy_protocol_attr(identify.target_port_protocols,
 330                 target_port_protocols);
 331 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 332                 unsigned long long);
 333 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 334 sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", u8);
 335 sas_phy_linkspeed_attr(negotiated_linkrate);
 336 sas_phy_linkspeed_attr(minimum_linkrate_hw);
 337 sas_phy_linkspeed_attr(minimum_linkrate);
 338 sas_phy_linkspeed_attr(maximum_linkrate_hw);
 339 sas_phy_linkspeed_attr(maximum_linkrate);
 340 sas_phy_linkerror_attr(invalid_dword_count);
 341 sas_phy_linkerror_attr(running_disparity_error_count);
 342 sas_phy_linkerror_attr(loss_of_dword_sync_count);
 343 sas_phy_linkerror_attr(phy_reset_problem_count);
 344
 345
 346 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 347                 "sas_phy", NULL, NULL, NULL);
 348
 349 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 350 {
 351         struct Scsi_Host *shost;
 352         struct sas_internal *i;
 353
 354         if (!scsi_is_sas_phy(dev))
 355                 return 0;
 356         shost = dev_to_shost(dev->parent);
 357
 358         if (!shost->transportt)
 359                 return 0;
 360         if (shost->transportt->host_attrs.ac.class !=
 361                         &sas_host_class.class)
 362                 return 0;
 363
 364         i = to_sas_internal(shost->transportt);
 365         return &i->phy_attr_cont.ac == cont;
 366 }
 367
 368 static void sas_phy_release(struct device *dev)
 369 {
 370         struct sas_phy *phy = dev_to_phy(dev);
 371
 372         put_device(dev->parent);
 373         kfree(phy);
 374 }
 375
 376 /**
 377  * sas_phy_alloc  --  allocates and initialize a SAS PHY structure
 378  * @parent:     Parent device
 379  * @number:     Port number
 380  *
 381  * Allocates an SAS PHY structure.  It will be added in the device tree
 382  * below the device specified by @parent, which has to be either a Scsi_Host
 383  * or sas_rphy.
 384  *
 385  * Returns:
 386  *      SAS PHY allocated or %NULL if the allocation failed.
 387  */
 388 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 389 {
 390         struct Scsi_Host *shost = dev_to_shost(parent);
 391         struct sas_phy *phy;
 392
 393         phy = kmalloc(sizeof(*phy), GFP_KERNEL);
 394         if (!phy)
 395                 return NULL;
 396         memset(phy, 0, sizeof(*phy));
 397
 398         get_device(parent);
 399
 400         phy->number = number;
 401
 402         device_initialize(&phy->dev);
 403         phy->dev.parent = get_device(parent);
 404         phy->dev.release = sas_phy_release;
 405         sprintf(phy->dev.bus_id, "phy-%d:%d", shost->host_no, number);
 406
 407         transport_setup_device(&phy->dev);
 408
 409         return phy;
 410 }
 411 EXPORT_SYMBOL(sas_phy_alloc);
 412
 413 /**
 414  * sas_phy_add  --  add a SAS PHY to the device hierachy
 415  * @phy:        The PHY to be added
 416  *
 417  * Publishes a SAS PHY to the rest of the system.
 418  */
 419 int sas_phy_add(struct sas_phy *phy)
 420 {
 421         int error;
 422
 423         error = device_add(&phy->dev);
 424         if (!error) {
 425                 transport_add_device(&phy->dev);
 426                 transport_configure_device(&phy->dev);
 427         }
 428
 429         return error;
 430 }
 431 EXPORT_SYMBOL(sas_phy_add);
 432
 433 /**
 434  * sas_phy_free  --  free a SAS PHY
 435  * @phy:        SAS PHY to free
 436  *
 437  * Frees the specified SAS PHY.
 438  *
 439  * Note:
 440  *   This function must only be called on a PHY that has not
 441  *   sucessfully been added using sas_phy_add().
 442  */
 443 void sas_phy_free(struct sas_phy *phy)
 444 {
 445         transport_destroy_device(&phy->dev);
 446         put_device(phy->dev.parent);
 447         put_device(phy->dev.parent);
 448         put_device(phy->dev.parent);
 449         kfree(phy);
 450 }
 451 EXPORT_SYMBOL(sas_phy_free);
 452
 453 /**
 454  * sas_phy_delete  --  remove SAS PHY
 455  * @phy:        SAS PHY to remove
 456  *
 457  * Removes the specified SAS PHY.  If the SAS PHY has an
 458  * associated remote PHY it is removed before.
 459  */
 460 void
 461 sas_phy_delete(struct sas_phy *phy)
 462 {
 463         struct device *dev = &phy->dev;
 464
 465         if (phy->rphy)
 466                 sas_rphy_delete(phy->rphy);
 467
 468         transport_remove_device(dev);
 469         device_del(dev);
 470         transport_destroy_device(dev);
 471         put_device(dev->parent);
 472 }
 473 EXPORT_SYMBOL(sas_phy_delete);
 474
 475 /**
 476  * scsi_is_sas_phy  --  check if a struct device represents a SAS PHY
 477  * @dev:        device to check
 478  *
 479  * Returns:
 480  *      %1 if the device represents a SAS PHY, %0 else
 481  */
 482 int scsi_is_sas_phy(const struct device *dev)
 483 {
 484         return dev->release == sas_phy_release;
 485 }
 486 EXPORT_SYMBOL(scsi_is_sas_phy);
 487
 488 /*
 489  * SAS remote PHY attributes.
 490  */
 491
 492 #define sas_rphy_show_simple(field, name, format_string, cast)          \
 493 static ssize_t                                                          \
 494 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
 495 {                                                                       \
 496         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
 497                                                                         \
 498         return snprintf(buf, 20, format_string, cast rphy->field);      \
 499 }
 500
 501 #define sas_rphy_simple_attr(field, name, format_string, type)          \
 502         sas_rphy_show_simple(field, name, format_string, (type))        \
 503 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
 504                 show_sas_rphy_##name, NULL)
 505
 506 #define sas_rphy_show_protocol(field, name)                             \
 507 static ssize_t                                                          \
 508 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
 509 {                                                                       \
 510         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
 511                                                                         \
 512         if (!rphy->field)                                       \
 513                 return snprintf(buf, 20, "none\n");                     \
 514         return get_sas_protocol_names(rphy->field, buf);        \
 515 }
 516
 517 #define sas_rphy_protocol_attr(field, name)                             \
 518         sas_rphy_show_protocol(field, name)                             \
 519 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
 520                 show_sas_rphy_##name, NULL)
 521
 522 static ssize_t
 523 show_sas_rphy_device_type(struct class_device *cdev, char *buf)
 524 {
 525         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
 526
 527         if (!rphy->identify.device_type)
 528                 return snprintf(buf, 20, "none\n");
 529         return get_sas_device_type_names(
 530                         rphy->identify.device_type, buf);
 531 }
 532
 533 static SAS_CLASS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
 534                 show_sas_rphy_device_type, NULL);
 535
 536 sas_rphy_protocol_attr(identify.initiator_port_protocols,
 537                 initiator_port_protocols);
 538 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
 539 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 540                 unsigned long long);
 541 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 542
 543 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
 544                 "sas_rphy", NULL, NULL, NULL);
 545
 546 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
 547 {
 548         struct Scsi_Host *shost;
 549         struct sas_internal *i;
 550
 551         if (!scsi_is_sas_rphy(dev))
 552                 return 0;
 553         shost = dev_to_shost(dev->parent->parent);
 554
 555         if (!shost->transportt)
 556                 return 0;
 557         if (shost->transportt->host_attrs.ac.class !=
 558                         &sas_host_class.class)
 559                 return 0;
 560
 561         i = to_sas_internal(shost->transportt);
 562         return &i->rphy_attr_cont.ac == cont;
 563 }
 564
 565 static void sas_rphy_release(struct device *dev)
 566 {
 567         struct sas_rphy *rphy = dev_to_rphy(dev);
 568
 569         put_device(dev->parent);
 570         kfree(rphy);
 571 }
 572
 573 /**
 574  * sas_rphy_alloc  --  allocates and initialize a SAS remote PHY structure
 575  * @parent:             SAS PHY this remote PHY is conneted to
 576  *
 577  * Allocates an SAS remote PHY structure, connected to @parent.
 578  *
 579  * Returns:
 580  *      SAS PHY allocated or %NULL if the allocation failed.
 581  */
 582 struct sas_rphy *sas_rphy_alloc(struct sas_phy *parent)
 583 {
 584         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
 585         struct sas_rphy *rphy;
 586
 587         rphy = kmalloc(sizeof(*rphy), GFP_KERNEL);
 588         if (!rphy) {
 589                 put_device(&parent->dev);
 590                 return NULL;
 591         }
 592         memset(rphy, 0, sizeof(*rphy));
 593
 594         device_initialize(&rphy->dev);
 595         rphy->dev.parent = get_device(&parent->dev);
 596         rphy->dev.release = sas_rphy_release;
 597         sprintf(rphy->dev.bus_id, "rphy-%d:%d",
 598                 shost->host_no, parent->number);
 599         transport_setup_device(&rphy->dev);
 600
 601         return rphy;
 602 }
 603 EXPORT_SYMBOL(sas_rphy_alloc);
 604
 605 /**
 606  * sas_rphy_add  --  add a SAS remote PHY to the device hierachy
 607  * @rphy:       The remote PHY to be added
 608  *
 609  * Publishes a SAS remote PHY to the rest of the system.
 610  */
 611 int sas_rphy_add(struct sas_rphy *rphy)
 612 {
 613         struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
 614         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
 615         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 616         struct sas_identify *identify = &rphy->identify;
 617         int error;
 618
 619         if (parent->rphy)
 620                 return -ENXIO;
 621         parent->rphy = rphy;
 622
 623         error = device_add(&rphy->dev);
 624         if (error)
 625                 return error;
 626         transport_add_device(&rphy->dev);
 627         transport_configure_device(&rphy->dev);
 628
 629         spin_lock(&sas_host->lock);
 630         list_add_tail(&rphy->list, &sas_host->rphy_list);
 631         if (identify->device_type == SAS_END_DEVICE &&
 632             (identify->target_port_protocols &
 633              (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
 634                 rphy->scsi_target_id = sas_host->next_target_id++;
 635         else
 636                 rphy->scsi_target_id = -1;
 637         spin_unlock(&sas_host->lock);
 638
 639         if (rphy->scsi_target_id != -1) {
 640                 scsi_scan_target(&rphy->dev, parent->number,
 641                                 rphy->scsi_target_id, ~0, 0);
 642         }
 643
 644         return 0;
 645 }
 646 EXPORT_SYMBOL(sas_rphy_add);
 647
 648 /**
 649  * sas_rphy_free  --  free a SAS remote PHY
 650  * @rphy        SAS remote PHY to free
 651  *
 652  * Frees the specified SAS remote PHY.
 653  *
 654  * Note:
 655  *   This function must only be called on a remote
 656  *   PHY that has not sucessfully been added using
 657  *   sas_rphy_add().
 658  */
 659 void sas_rphy_free(struct sas_rphy *rphy)
 660 {
 661         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
 662         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 663
 664         spin_lock(&sas_host->lock);
 665         list_del(&rphy->list);
 666         spin_unlock(&sas_host->lock);
 667
 668         transport_destroy_device(&rphy->dev);
 669         put_device(rphy->dev.parent);
 670         put_device(rphy->dev.parent);
 671         put_device(rphy->dev.parent);
 672         kfree(rphy);
 673 }
 674 EXPORT_SYMBOL(sas_rphy_free);
 675
 676 /**
 677  * sas_rphy_delete  --  remove SAS remote PHY
 678  * @rphy:       SAS remote PHY to remove
 679  *
 680  * Removes the specified SAS remote PHY.
 681  */
 682 void
 683 sas_rphy_delete(struct sas_rphy *rphy)
 684 {
 685         struct device *dev = &rphy->dev;
 686         struct sas_phy *parent = dev_to_phy(dev->parent);
 687         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
 688         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 689
 690         scsi_remove_target(dev);
 691
 692         transport_remove_device(dev);
 693         device_del(dev);
 694         transport_destroy_device(dev);
 695
 696         spin_lock(&sas_host->lock);
 697         list_del(&rphy->list);
 698         spin_unlock(&sas_host->lock);
 699
 700         put_device(&parent->dev);
 701 }
 702 EXPORT_SYMBOL(sas_rphy_delete);
 703
 704 /**
 705  * scsi_is_sas_rphy  --  check if a struct device represents a SAS remote PHY
 706  * @dev:        device to check
 707  *
 708  * Returns:
 709  *      %1 if the device represents a SAS remote PHY, %0 else
 710  */
 711 int scsi_is_sas_rphy(const struct device *dev)
 712 {
 713         return dev->release == sas_rphy_release;
 714 }
 715 EXPORT_SYMBOL(scsi_is_sas_rphy);
 716
 717
 718 /*
 719  * SCSI scan helper
 720  */
 721
 722 static struct device *sas_target_parent(struct Scsi_Host *shost,
 723                                         int channel, uint id)
 724 {
 725         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 726         struct sas_rphy *rphy;
 727         struct device *dev = NULL;
 728
 729         spin_lock(&sas_host->lock);
 730         list_for_each_entry(rphy, &sas_host->rphy_list, list) {
 731                 struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
 732                 if (parent->number == channel &&
 733                     rphy->scsi_target_id == id)
 734                         dev = &rphy->dev;
 735         }
 736         spin_unlock(&sas_host->lock);
 737
 738         return dev;
 739 }
 740
 741
 742 /*
 743  * Setup / Teardown code
 744  */
 745
 746 #define SETUP_RPORT_ATTRIBUTE(field)                                    \
 747         i->private_rphy_attrs[count] = class_device_attr_##field;       \
 748         i->private_rphy_attrs[count].attr.mode = S_IRUGO;               \
 749         i->private_rphy_attrs[count].store = NULL;                      \
 750         i->rphy_attrs[count] = &i->private_rphy_attrs[count];   \
 751         count++
 752
 753 #define SETUP_PORT_ATTRIBUTE(field)                                     \
 754         i->private_phy_attrs[count] = class_device_attr_##field;        \
 755         i->private_phy_attrs[count].attr.mode = S_IRUGO;                \
 756         i->private_phy_attrs[count].store = NULL;                       \
 757         i->phy_attrs[count] = &i->private_phy_attrs[count];             \
 758         count++
 759
 760 #define SETUP_PORT_ATTRIBUTE_WRONLY(field)                              \
 761         i->private_phy_attrs[count] = class_device_attr_##field;        \
 762         i->private_phy_attrs[count].attr.mode = S_IWUGO;                \
 763         i->private_phy_attrs[count].show = NULL;                        \
 764         i->phy_attrs[count] = &i->private_phy_attrs[count];             \
 765         count++
 766
 767
 768 /**
 769  * sas_attach_transport  --  instantiate SAS transport template
 770  * @ft:         SAS transport class function template
 771  */
 772 struct scsi_transport_template *
 773 sas_attach_transport(struct sas_function_template *ft)
 774 {
 775         struct sas_internal *i;
 776         int count;
 777
 778         i = kmalloc(sizeof(struct sas_internal), GFP_KERNEL);
 779         if (!i)
 780                 return NULL;
 781         memset(i, 0, sizeof(struct sas_internal));
 782
 783         i->t.target_parent = sas_target_parent;
 784
 785         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
 786         i->t.host_attrs.ac.class = &sas_host_class.class;
 787         i->t.host_attrs.ac.match = sas_host_match;
 788         transport_container_register(&i->t.host_attrs);
 789         i->t.host_size = sizeof(struct sas_host_attrs);
 790
 791         i->phy_attr_cont.ac.class = &sas_phy_class.class;
 792         i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
 793         i->phy_attr_cont.ac.match = sas_phy_match;
 794         transport_container_register(&i->phy_attr_cont);
 795
 796         i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
 797         i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
 798         i->rphy_attr_cont.ac.match = sas_rphy_match;
 799         transport_container_register(&i->rphy_attr_cont);
 800
 801         i->f = ft;
 802
 803         count = 0;
 804         i->host_attrs[count] = NULL;
 805
 806         count = 0;
 807         SETUP_PORT_ATTRIBUTE(initiator_port_protocols);
 808         SETUP_PORT_ATTRIBUTE(target_port_protocols);
 809         SETUP_PORT_ATTRIBUTE(device_type);
 810         SETUP_PORT_ATTRIBUTE(sas_address);
 811         SETUP_PORT_ATTRIBUTE(phy_identifier);
 812         SETUP_PORT_ATTRIBUTE(port_identifier);
 813         SETUP_PORT_ATTRIBUTE(negotiated_linkrate);
 814         SETUP_PORT_ATTRIBUTE(minimum_linkrate_hw);
 815         SETUP_PORT_ATTRIBUTE(minimum_linkrate);
 816         SETUP_PORT_ATTRIBUTE(maximum_linkrate_hw);
 817         SETUP_PORT_ATTRIBUTE(maximum_linkrate);
 818
 819         SETUP_PORT_ATTRIBUTE(invalid_dword_count);
 820         SETUP_PORT_ATTRIBUTE(running_disparity_error_count);
 821         SETUP_PORT_ATTRIBUTE(loss_of_dword_sync_count);
 822         SETUP_PORT_ATTRIBUTE(phy_reset_problem_count);
 823         SETUP_PORT_ATTRIBUTE_WRONLY(link_reset);
 824         SETUP_PORT_ATTRIBUTE_WRONLY(hard_reset);
 825         i->phy_attrs[count] = NULL;
 826
 827         count = 0;
 828         SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
 829         SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
 830         SETUP_RPORT_ATTRIBUTE(rphy_device_type);
 831         SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
 832         SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
 833         i->rphy_attrs[count] = NULL;
 834
 835         return &i->t;
 836 }
 837 EXPORT_SYMBOL(sas_attach_transport);
 838
 839 /**
 840  * sas_release_transport  --  release SAS transport template instance
 841  * @t:          transport template instance
 842  */
 843 void sas_release_transport(struct scsi_transport_template *t)
 844 {
 845         struct sas_internal *i = to_sas_internal(t);
 846
 847         transport_container_unregister(&i->t.host_attrs);
 848         transport_container_unregister(&i->phy_attr_cont);
 849         transport_container_unregister(&i->rphy_attr_cont);
 850
 851         kfree(i);
 852 }
 853 EXPORT_SYMBOL(sas_release_transport);
 854
 855 static __init int sas_transport_init(void)
 856 {
 857         int error;
 858
 859         error = transport_class_register(&sas_host_class);
 860         if (error)
 861                 goto out;
 862         error = transport_class_register(&sas_phy_class);
 863         if (error)
 864                 goto out_unregister_transport;
 865         error = transport_class_register(&sas_rphy_class);
 866         if (error)
 867                 goto out_unregister_phy;
 868
 869         return 0;
 870
 871  out_unregister_phy:
 872         transport_class_unregister(&sas_phy_class);
 873  out_unregister_transport:
 874         transport_class_unregister(&sas_host_class);
 875  out:
 876         return error;
 877
 878 }
 879
 880 static void __exit sas_transport_exit(void)
 881 {
 882         transport_class_unregister(&sas_host_class);
 883         transport_class_unregister(&sas_phy_class);
 884         transport_class_unregister(&sas_rphy_class);
 885 }
 886
 887 MODULE_AUTHOR("Christoph Hellwig");
 888 MODULE_DESCRIPTION("SAS Transphy Attributes");
 889 MODULE_LICENSE("GPL");
 890
 891 module_init(sas_transport_init);
 892 module_exit(sas_transport_exit);