git.oblomov.eu Git - linux-2.6/blob - 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/jiffies.h>
  29 #include <linux/err.h>
  30 #include <linux/slab.h>
  31 #include <linux/string.h>
  32
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_device.h>
  35 #include <scsi/scsi_host.h>
  36 #include <scsi/scsi_transport.h>
  37 #include <scsi/scsi_transport_sas.h>
  38
  39 #include "scsi_sas_internal.h"
  40 struct sas_host_attrs {
  41         struct list_head rphy_list;
  42         struct mutex lock;
  43         u32 next_target_id;
  44         u32 next_expander_id;
  45         int next_port_id;
  46 };
  47 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
  48
  49
  50 /*
  51  * Hack to allow attributes of the same name in different objects.
  52  */
  53 #define SAS_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  54         struct class_device_attribute class_device_attr_##_prefix##_##_name = \
  55         __ATTR(_name,_mode,_show,_store)
  56
  57
  58 /*
  59  * Pretty printing helpers
  60  */
  61
  62 #define sas_bitfield_name_match(title, table)                   \
  63 static ssize_t                                                  \
  64 get_sas_##title##_names(u32 table_key, char *buf)               \
  65 {                                                               \
  66         char *prefix = "";                                      \
  67         ssize_t len = 0;                                        \
  68         int i;                                                  \
  69                                                                 \
  70         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
  71                 if (table[i].value & table_key) {               \
  72                         len += sprintf(buf + len, "%s%s",       \
  73                                 prefix, table[i].name);         \
  74                         prefix = ", ";                          \
  75                 }                                               \
  76         }                                                       \
  77         len += sprintf(buf + len, "\n");                        \
  78         return len;                                             \
  79 }
  80
  81 #define sas_bitfield_name_set(title, table)                     \
  82 static ssize_t                                                  \
  83 set_sas_##title##_names(u32 *table_key, const char *buf)        \
  84 {                                                               \
  85         ssize_t len = 0;                                        \
  86         int i;                                                  \
  87                                                                 \
  88         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
  89                 len = strlen(table[i].name);                    \
  90                 if (strncmp(buf, table[i].name, len) == 0 &&    \
  91                     (buf[len] == '\n' || buf[len] == '\0')) {   \
  92                         *table_key = table[i].value;            \
  93                         return 0;                               \
  94                 }                                               \
  95         }                                                       \
  96         return -EINVAL;                                         \
  97 }
  98
  99 #define sas_bitfield_name_search(title, table)                  \
 100 static ssize_t                                                  \
 101 get_sas_##title##_names(u32 table_key, char *buf)               \
 102 {                                                               \
 103         ssize_t len = 0;                                        \
 104         int i;                                                  \
 105                                                                 \
 106         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 107                 if (table[i].value == table_key) {              \
 108                         len += sprintf(buf + len, "%s",         \
 109                                 table[i].name);                 \
 110                         break;                                  \
 111                 }                                               \
 112         }                                                       \
 113         len += sprintf(buf + len, "\n");                        \
 114         return len;                                             \
 115 }
 116
 117 static struct {
 118         u32             value;
 119         char            *name;
 120 } sas_device_type_names[] = {
 121         { SAS_PHY_UNUSED,               "unused" },
 122         { SAS_END_DEVICE,               "end device" },
 123         { SAS_EDGE_EXPANDER_DEVICE,     "edge expander" },
 124         { SAS_FANOUT_EXPANDER_DEVICE,   "fanout expander" },
 125 };
 126 sas_bitfield_name_search(device_type, sas_device_type_names)
 127
 128
 129 static struct {
 130         u32             value;
 131         char            *name;
 132 } sas_protocol_names[] = {
 133         { SAS_PROTOCOL_SATA,            "sata" },
 134         { SAS_PROTOCOL_SMP,             "smp" },
 135         { SAS_PROTOCOL_STP,             "stp" },
 136         { SAS_PROTOCOL_SSP,             "ssp" },
 137 };
 138 sas_bitfield_name_match(protocol, sas_protocol_names)
 139
 140 static struct {
 141         u32             value;
 142         char            *name;
 143 } sas_linkspeed_names[] = {
 144         { SAS_LINK_RATE_UNKNOWN,        "Unknown" },
 145         { SAS_PHY_DISABLED,             "Phy disabled" },
 146         { SAS_LINK_RATE_FAILED,         "Link Rate failed" },
 147         { SAS_SATA_SPINUP_HOLD,         "Spin-up hold" },
 148         { SAS_LINK_RATE_1_5_GBPS,       "1.5 Gbit" },
 149         { SAS_LINK_RATE_3_0_GBPS,       "3.0 Gbit" },
 150         { SAS_LINK_RATE_6_0_GBPS,       "6.0 Gbit" },
 151 };
 152 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 153 sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
 154
 155 /*
 156  * SAS host attributes
 157  */
 158
 159 static int sas_host_setup(struct transport_container *tc, struct device *dev,
 160                           struct class_device *cdev)
 161 {
 162         struct Scsi_Host *shost = dev_to_shost(dev);
 163         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 164
 165         INIT_LIST_HEAD(&sas_host->rphy_list);
 166         mutex_init(&sas_host->lock);
 167         sas_host->next_target_id = 0;
 168         sas_host->next_expander_id = 0;
 169         sas_host->next_port_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         int pass = (int)(unsigned long)data;
 199
 200         if (pass == 0 && scsi_is_sas_port(dev))
 201                 sas_port_delete(dev_to_sas_port(dev));
 202         else if (pass == 1 && scsi_is_sas_phy(dev))
 203                 sas_phy_delete(dev_to_phy(dev));
 204         return 0;
 205 }
 206
 207 /**
 208  * sas_remove_children  --  tear down a devices SAS data structures
 209  * @dev:        device belonging to the sas object
 210  *
 211  * Removes all SAS PHYs and remote PHYs for a given object
 212  */
 213 void sas_remove_children(struct device *dev)
 214 {
 215         device_for_each_child(dev, (void *)0, do_sas_phy_delete);
 216         device_for_each_child(dev, (void *)1, do_sas_phy_delete);
 217 }
 218 EXPORT_SYMBOL(sas_remove_children);
 219
 220 /**
 221  * sas_remove_host  --  tear down a Scsi_Host's SAS data structures
 222  * @shost:      Scsi Host that is torn down
 223  *
 224  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
 225  * Must be called just before scsi_remove_host for SAS HBAs.
 226  */
 227 void sas_remove_host(struct Scsi_Host *shost)
 228 {
 229         sas_remove_children(&shost->shost_gendev);
 230 }
 231 EXPORT_SYMBOL(sas_remove_host);
 232
 233
 234 /*
 235  * SAS Phy attributes
 236  */
 237
 238 #define sas_phy_show_simple(field, name, format_string, cast)           \
 239 static ssize_t                                                          \
 240 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
 241 {                                                                       \
 242         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 243                                                                         \
 244         return snprintf(buf, 20, format_string, cast phy->field);       \
 245 }
 246
 247 #define sas_phy_simple_attr(field, name, format_string, type)           \
 248         sas_phy_show_simple(field, name, format_string, (type)) \
 249 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 250
 251 #define sas_phy_show_protocol(field, name)                              \
 252 static ssize_t                                                          \
 253 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
 254 {                                                                       \
 255         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 256                                                                         \
 257         if (!phy->field)                                                \
 258                 return snprintf(buf, 20, "none\n");                     \
 259         return get_sas_protocol_names(phy->field, buf);         \
 260 }
 261
 262 #define sas_phy_protocol_attr(field, name)                              \
 263         sas_phy_show_protocol(field, name)                              \
 264 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 265
 266 #define sas_phy_show_linkspeed(field)                                   \
 267 static ssize_t                                                          \
 268 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
 269 {                                                                       \
 270         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 271                                                                         \
 272         return get_sas_linkspeed_names(phy->field, buf);                \
 273 }
 274
 275 /* Fudge to tell if we're minimum or maximum */
 276 #define sas_phy_store_linkspeed(field)                                  \
 277 static ssize_t                                                          \
 278 store_sas_phy_##field(struct class_device *cdev, const char *buf,       \
 279                       size_t count)                                     \
 280 {                                                                       \
 281         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 282         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 283         struct sas_internal *i = to_sas_internal(shost->transportt);    \
 284         u32 value;                                                      \
 285         struct sas_phy_linkrates rates = {0};                           \
 286         int error;                                                      \
 287                                                                         \
 288         error = set_sas_linkspeed_names(&value, buf);                   \
 289         if (error)                                                      \
 290                 return error;                                           \
 291         rates.field = value;                                            \
 292         error = i->f->set_phy_speed(phy, &rates);                       \
 293                                                                         \
 294         return error ? error : count;                                   \
 295 }
 296
 297 #define sas_phy_linkspeed_rw_attr(field)                                \
 298         sas_phy_show_linkspeed(field)                                   \
 299         sas_phy_store_linkspeed(field)                                  \
 300 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,          \
 301         store_sas_phy_##field)
 302
 303 #define sas_phy_linkspeed_attr(field)                                   \
 304         sas_phy_show_linkspeed(field)                                   \
 305 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 306
 307
 308 #define sas_phy_show_linkerror(field)                                   \
 309 static ssize_t                                                          \
 310 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
 311 {                                                                       \
 312         struct sas_phy *phy = transport_class_to_phy(cdev);             \
 313         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 314         struct sas_internal *i = to_sas_internal(shost->transportt);    \
 315         int error;                                                      \
 316                                                                         \
 317         error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;   \
 318         if (error)                                                      \
 319                 return error;                                           \
 320         return snprintf(buf, 20, "%u\n", phy->field);                   \
 321 }
 322
 323 #define sas_phy_linkerror_attr(field)                                   \
 324         sas_phy_show_linkerror(field)                                   \
 325 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 326
 327
 328 static ssize_t
 329 show_sas_device_type(struct class_device *cdev, char *buf)
 330 {
 331         struct sas_phy *phy = transport_class_to_phy(cdev);
 332
 333         if (!phy->identify.device_type)
 334                 return snprintf(buf, 20, "none\n");
 335         return get_sas_device_type_names(phy->identify.device_type, buf);
 336 }
 337 static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 338
 339 static ssize_t do_sas_phy_enable(struct class_device *cdev,
 340                 size_t count, int enable)
 341 {
 342         struct sas_phy *phy = transport_class_to_phy(cdev);
 343         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 344         struct sas_internal *i = to_sas_internal(shost->transportt);
 345         int error;
 346
 347         error = i->f->phy_enable(phy, enable);
 348         if (error)
 349                 return error;
 350         phy->enabled = enable;
 351         return count;
 352 };
 353
 354 static ssize_t store_sas_phy_enable(struct class_device *cdev,
 355                 const char *buf, size_t count)
 356 {
 357         if (count < 1)
 358                 return -EINVAL;
 359
 360         switch (buf[0]) {
 361         case '0':
 362                 do_sas_phy_enable(cdev, count, 0);
 363                 break;
 364         case '1':
 365                 do_sas_phy_enable(cdev, count, 1);
 366                 break;
 367         default:
 368                 return -EINVAL;
 369         }
 370
 371         return count;
 372 }
 373
 374 static ssize_t show_sas_phy_enable(struct class_device *cdev, char *buf)
 375 {
 376         struct sas_phy *phy = transport_class_to_phy(cdev);
 377
 378         return snprintf(buf, 20, "%d", phy->enabled);
 379 }
 380
 381 static CLASS_DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
 382                          store_sas_phy_enable);
 383
 384 static ssize_t do_sas_phy_reset(struct class_device *cdev,
 385                 size_t count, int hard_reset)
 386 {
 387         struct sas_phy *phy = transport_class_to_phy(cdev);
 388         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 389         struct sas_internal *i = to_sas_internal(shost->transportt);
 390         int error;
 391
 392         error = i->f->phy_reset(phy, hard_reset);
 393         if (error)
 394                 return error;
 395         return count;
 396 };
 397
 398 static ssize_t store_sas_link_reset(struct class_device *cdev,
 399                 const char *buf, size_t count)
 400 {
 401         return do_sas_phy_reset(cdev, count, 0);
 402 }
 403 static CLASS_DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 404
 405 static ssize_t store_sas_hard_reset(struct class_device *cdev,
 406                 const char *buf, size_t count)
 407 {
 408         return do_sas_phy_reset(cdev, count, 1);
 409 }
 410 static CLASS_DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 411
 412 sas_phy_protocol_attr(identify.initiator_port_protocols,
 413                 initiator_port_protocols);
 414 sas_phy_protocol_attr(identify.target_port_protocols,
 415                 target_port_protocols);
 416 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 417                 unsigned long long);
 418 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 419 //sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", int);
 420 sas_phy_linkspeed_attr(negotiated_linkrate);
 421 sas_phy_linkspeed_attr(minimum_linkrate_hw);
 422 sas_phy_linkspeed_rw_attr(minimum_linkrate);
 423 sas_phy_linkspeed_attr(maximum_linkrate_hw);
 424 sas_phy_linkspeed_rw_attr(maximum_linkrate);
 425 sas_phy_linkerror_attr(invalid_dword_count);
 426 sas_phy_linkerror_attr(running_disparity_error_count);
 427 sas_phy_linkerror_attr(loss_of_dword_sync_count);
 428 sas_phy_linkerror_attr(phy_reset_problem_count);
 429
 430
 431 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 432                 "sas_phy", NULL, NULL, NULL);
 433
 434 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 435 {
 436         struct Scsi_Host *shost;
 437         struct sas_internal *i;
 438
 439         if (!scsi_is_sas_phy(dev))
 440                 return 0;
 441         shost = dev_to_shost(dev->parent);
 442
 443         if (!shost->transportt)
 444                 return 0;
 445         if (shost->transportt->host_attrs.ac.class !=
 446                         &sas_host_class.class)
 447                 return 0;
 448
 449         i = to_sas_internal(shost->transportt);
 450         return &i->phy_attr_cont.ac == cont;
 451 }
 452
 453 static void sas_phy_release(struct device *dev)
 454 {
 455         struct sas_phy *phy = dev_to_phy(dev);
 456
 457         put_device(dev->parent);
 458         kfree(phy);
 459 }
 460
 461 /**
 462  * sas_phy_alloc  --  allocates and initialize a SAS PHY structure
 463  * @parent:     Parent device
 464  * @number:     Phy index
 465  *
 466  * Allocates an SAS PHY structure.  It will be added in the device tree
 467  * below the device specified by @parent, which has to be either a Scsi_Host
 468  * or sas_rphy.
 469  *
 470  * Returns:
 471  *      SAS PHY allocated or %NULL if the allocation failed.
 472  */
 473 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 474 {
 475         struct Scsi_Host *shost = dev_to_shost(parent);
 476         struct sas_phy *phy;
 477
 478         phy = kzalloc(sizeof(*phy), GFP_KERNEL);
 479         if (!phy)
 480                 return NULL;
 481
 482         phy->number = number;
 483         phy->enabled = 1;
 484
 485         device_initialize(&phy->dev);
 486         phy->dev.parent = get_device(parent);
 487         phy->dev.release = sas_phy_release;
 488         INIT_LIST_HEAD(&phy->port_siblings);
 489         if (scsi_is_sas_expander_device(parent)) {
 490                 struct sas_rphy *rphy = dev_to_rphy(parent);
 491                 sprintf(phy->dev.bus_id, "phy-%d:%d:%d", shost->host_no,
 492                         rphy->scsi_target_id, number);
 493         } else
 494                 sprintf(phy->dev.bus_id, "phy-%d:%d", shost->host_no, number);
 495
 496         transport_setup_device(&phy->dev);
 497
 498         return phy;
 499 }
 500 EXPORT_SYMBOL(sas_phy_alloc);
 501
 502 /**
 503  * sas_phy_add  --  add a SAS PHY to the device hierarchy
 504  * @phy:        The PHY to be added
 505  *
 506  * Publishes a SAS PHY to the rest of the system.
 507  */
 508 int sas_phy_add(struct sas_phy *phy)
 509 {
 510         int error;
 511
 512         error = device_add(&phy->dev);
 513         if (!error) {
 514                 transport_add_device(&phy->dev);
 515                 transport_configure_device(&phy->dev);
 516         }
 517
 518         return error;
 519 }
 520 EXPORT_SYMBOL(sas_phy_add);
 521
 522 /**
 523  * sas_phy_free  --  free a SAS PHY
 524  * @phy:        SAS PHY to free
 525  *
 526  * Frees the specified SAS PHY.
 527  *
 528  * Note:
 529  *   This function must only be called on a PHY that has not
 530  *   sucessfully been added using sas_phy_add().
 531  */
 532 void sas_phy_free(struct sas_phy *phy)
 533 {
 534         transport_destroy_device(&phy->dev);
 535         put_device(&phy->dev);
 536 }
 537 EXPORT_SYMBOL(sas_phy_free);
 538
 539 /**
 540  * sas_phy_delete  --  remove SAS PHY
 541  * @phy:        SAS PHY to remove
 542  *
 543  * Removes the specified SAS PHY.  If the SAS PHY has an
 544  * associated remote PHY it is removed before.
 545  */
 546 void
 547 sas_phy_delete(struct sas_phy *phy)
 548 {
 549         struct device *dev = &phy->dev;
 550
 551         /* this happens if the phy is still part of a port when deleted */
 552         BUG_ON(!list_empty(&phy->port_siblings));
 553
 554         transport_remove_device(dev);
 555         device_del(dev);
 556         transport_destroy_device(dev);
 557         put_device(dev);
 558 }
 559 EXPORT_SYMBOL(sas_phy_delete);
 560
 561 /**
 562  * scsi_is_sas_phy  --  check if a struct device represents a SAS PHY
 563  * @dev:        device to check
 564  *
 565  * Returns:
 566  *      %1 if the device represents a SAS PHY, %0 else
 567  */
 568 int scsi_is_sas_phy(const struct device *dev)
 569 {
 570         return dev->release == sas_phy_release;
 571 }
 572 EXPORT_SYMBOL(scsi_is_sas_phy);
 573
 574 /*
 575  * SAS Port attributes
 576  */
 577 #define sas_port_show_simple(field, name, format_string, cast)          \
 578 static ssize_t                                                          \
 579 show_sas_port_##name(struct class_device *cdev, char *buf)              \
 580 {                                                                       \
 581         struct sas_port *port = transport_class_to_sas_port(cdev);      \
 582                                                                         \
 583         return snprintf(buf, 20, format_string, cast port->field);      \
 584 }
 585
 586 #define sas_port_simple_attr(field, name, format_string, type)          \
 587         sas_port_show_simple(field, name, format_string, (type))        \
 588 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
 589
 590 sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
 591
 592 static DECLARE_TRANSPORT_CLASS(sas_port_class,
 593                                "sas_port", NULL, NULL, NULL);
 594
 595 static int sas_port_match(struct attribute_container *cont, struct device *dev)
 596 {
 597         struct Scsi_Host *shost;
 598         struct sas_internal *i;
 599
 600         if (!scsi_is_sas_port(dev))
 601                 return 0;
 602         shost = dev_to_shost(dev->parent);
 603
 604         if (!shost->transportt)
 605                 return 0;
 606         if (shost->transportt->host_attrs.ac.class !=
 607                         &sas_host_class.class)
 608                 return 0;
 609
 610         i = to_sas_internal(shost->transportt);
 611         return &i->port_attr_cont.ac == cont;
 612 }
 613
 614
 615 static void sas_port_release(struct device *dev)
 616 {
 617         struct sas_port *port = dev_to_sas_port(dev);
 618
 619         BUG_ON(!list_empty(&port->phy_list));
 620
 621         put_device(dev->parent);
 622         kfree(port);
 623 }
 624
 625 static void sas_port_create_link(struct sas_port *port,
 626                                  struct sas_phy *phy)
 627 {
 628         int res;
 629
 630         res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
 631                                 phy->dev.bus_id);
 632         if (res)
 633                 goto err;
 634         res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
 635         if (res)
 636                 goto err;
 637         return;
 638 err:
 639         printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
 640                __FUNCTION__, res);
 641 }
 642
 643 static void sas_port_delete_link(struct sas_port *port,
 644                                  struct sas_phy *phy)
 645 {
 646         sysfs_remove_link(&port->dev.kobj, phy->dev.bus_id);
 647         sysfs_remove_link(&phy->dev.kobj, "port");
 648 }
 649
 650 /** sas_port_alloc - allocate and initialize a SAS port structure
 651  *
 652  * @parent:     parent device
 653  * @port_id:    port number
 654  *
 655  * Allocates a SAS port structure.  It will be added to the device tree
 656  * below the device specified by @parent which must be either a Scsi_Host
 657  * or a sas_expander_device.
 658  *
 659  * Returns %NULL on error
 660  */
 661 struct sas_port *sas_port_alloc(struct device *parent, int port_id)
 662 {
 663         struct Scsi_Host *shost = dev_to_shost(parent);
 664         struct sas_port *port;
 665
 666         port = kzalloc(sizeof(*port), GFP_KERNEL);
 667         if (!port)
 668                 return NULL;
 669
 670         port->port_identifier = port_id;
 671
 672         device_initialize(&port->dev);
 673
 674         port->dev.parent = get_device(parent);
 675         port->dev.release = sas_port_release;
 676
 677         mutex_init(&port->phy_list_mutex);
 678         INIT_LIST_HEAD(&port->phy_list);
 679
 680         if (scsi_is_sas_expander_device(parent)) {
 681                 struct sas_rphy *rphy = dev_to_rphy(parent);
 682                 sprintf(port->dev.bus_id, "port-%d:%d:%d", shost->host_no,
 683                         rphy->scsi_target_id, port->port_identifier);
 684         } else
 685                 sprintf(port->dev.bus_id, "port-%d:%d", shost->host_no,
 686                         port->port_identifier);
 687
 688         transport_setup_device(&port->dev);
 689
 690         return port;
 691 }
 692 EXPORT_SYMBOL(sas_port_alloc);
 693
 694 /** sas_port_alloc_num - allocate and initialize a SAS port structure
 695  *
 696  * @parent:     parent device
 697  *
 698  * Allocates a SAS port structure and a number to go with it.  This
 699  * interface is really for adapters where the port number has no
 700  * meansing, so the sas class should manage them.  It will be added to
 701  * the device tree below the device specified by @parent which must be
 702  * either a Scsi_Host or a sas_expander_device.
 703  *
 704  * Returns %NULL on error
 705  */
 706 struct sas_port *sas_port_alloc_num(struct device *parent)
 707 {
 708         int index;
 709         struct Scsi_Host *shost = dev_to_shost(parent);
 710         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 711
 712         /* FIXME: use idr for this eventually */
 713         mutex_lock(&sas_host->lock);
 714         if (scsi_is_sas_expander_device(parent)) {
 715                 struct sas_rphy *rphy = dev_to_rphy(parent);
 716                 struct sas_expander_device *exp = rphy_to_expander_device(rphy);
 717
 718                 index = exp->next_port_id++;
 719         } else
 720                 index = sas_host->next_port_id++;
 721         mutex_unlock(&sas_host->lock);
 722         return sas_port_alloc(parent, index);
 723 }
 724 EXPORT_SYMBOL(sas_port_alloc_num);
 725
 726 /**
 727  * sas_port_add - add a SAS port to the device hierarchy
 728  *
 729  * @port:       port to be added
 730  *
 731  * publishes a port to the rest of the system
 732  */
 733 int sas_port_add(struct sas_port *port)
 734 {
 735         int error;
 736
 737         /* No phys should be added until this is made visible */
 738         BUG_ON(!list_empty(&port->phy_list));
 739
 740         error = device_add(&port->dev);
 741
 742         if (error)
 743                 return error;
 744
 745         transport_add_device(&port->dev);
 746         transport_configure_device(&port->dev);
 747
 748         return 0;
 749 }
 750 EXPORT_SYMBOL(sas_port_add);
 751
 752 /**
 753  * sas_port_free  --  free a SAS PORT
 754  * @port:       SAS PORT to free
 755  *
 756  * Frees the specified SAS PORT.
 757  *
 758  * Note:
 759  *   This function must only be called on a PORT that has not
 760  *   sucessfully been added using sas_port_add().
 761  */
 762 void sas_port_free(struct sas_port *port)
 763 {
 764         transport_destroy_device(&port->dev);
 765         put_device(&port->dev);
 766 }
 767 EXPORT_SYMBOL(sas_port_free);
 768
 769 /**
 770  * sas_port_delete  --  remove SAS PORT
 771  * @port:       SAS PORT to remove
 772  *
 773  * Removes the specified SAS PORT.  If the SAS PORT has an
 774  * associated phys, unlink them from the port as well.
 775  */
 776 void sas_port_delete(struct sas_port *port)
 777 {
 778         struct device *dev = &port->dev;
 779         struct sas_phy *phy, *tmp_phy;
 780
 781         if (port->rphy) {
 782                 sas_rphy_delete(port->rphy);
 783                 port->rphy = NULL;
 784         }
 785
 786         mutex_lock(&port->phy_list_mutex);
 787         list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
 788                                  port_siblings) {
 789                 sas_port_delete_link(port, phy);
 790                 list_del_init(&phy->port_siblings);
 791         }
 792         mutex_unlock(&port->phy_list_mutex);
 793
 794         if (port->is_backlink) {
 795                 struct device *parent = port->dev.parent;
 796
 797                 sysfs_remove_link(&port->dev.kobj, parent->bus_id);
 798                 port->is_backlink = 0;
 799         }
 800
 801         transport_remove_device(dev);
 802         device_del(dev);
 803         transport_destroy_device(dev);
 804         put_device(dev);
 805 }
 806 EXPORT_SYMBOL(sas_port_delete);
 807
 808 /**
 809  * scsi_is_sas_port --  check if a struct device represents a SAS port
 810  * @dev:        device to check
 811  *
 812  * Returns:
 813  *      %1 if the device represents a SAS Port, %0 else
 814  */
 815 int scsi_is_sas_port(const struct device *dev)
 816 {
 817         return dev->release == sas_port_release;
 818 }
 819 EXPORT_SYMBOL(scsi_is_sas_port);
 820
 821 /**
 822  * sas_port_add_phy - add another phy to a port to form a wide port
 823  * @port:       port to add the phy to
 824  * @phy:        phy to add
 825  *
 826  * When a port is initially created, it is empty (has no phys).  All
 827  * ports must have at least one phy to operated, and all wide ports
 828  * must have at least two.  The current code makes no difference
 829  * between ports and wide ports, but the only object that can be
 830  * connected to a remote device is a port, so ports must be formed on
 831  * all devices with phys if they're connected to anything.
 832  */
 833 void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
 834 {
 835         mutex_lock(&port->phy_list_mutex);
 836         if (unlikely(!list_empty(&phy->port_siblings))) {
 837                 /* make sure we're already on this port */
 838                 struct sas_phy *tmp;
 839
 840                 list_for_each_entry(tmp, &port->phy_list, port_siblings)
 841                         if (tmp == phy)
 842                                 break;
 843                 /* If this trips, you added a phy that was already
 844                  * part of a different port */
 845                 if (unlikely(tmp != phy)) {
 846                         dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n", phy->dev.bus_id);
 847                         BUG();
 848                 }
 849         } else {
 850                 sas_port_create_link(port, phy);
 851                 list_add_tail(&phy->port_siblings, &port->phy_list);
 852                 port->num_phys++;
 853         }
 854         mutex_unlock(&port->phy_list_mutex);
 855 }
 856 EXPORT_SYMBOL(sas_port_add_phy);
 857
 858 /**
 859  * sas_port_delete_phy - remove a phy from a port or wide port
 860  * @port:       port to remove the phy from
 861  * @phy:        phy to remove
 862  *
 863  * This operation is used for tearing down ports again.  It must be
 864  * done to every port or wide port before calling sas_port_delete.
 865  */
 866 void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
 867 {
 868         mutex_lock(&port->phy_list_mutex);
 869         sas_port_delete_link(port, phy);
 870         list_del_init(&phy->port_siblings);
 871         port->num_phys--;
 872         mutex_unlock(&port->phy_list_mutex);
 873 }
 874 EXPORT_SYMBOL(sas_port_delete_phy);
 875
 876 void sas_port_mark_backlink(struct sas_port *port)
 877 {
 878         int res;
 879         struct device *parent = port->dev.parent->parent->parent;
 880
 881         if (port->is_backlink)
 882                 return;
 883         port->is_backlink = 1;
 884         res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
 885                                 parent->bus_id);
 886         if (res)
 887                 goto err;
 888         return;
 889 err:
 890         printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
 891                __FUNCTION__, res);
 892
 893 }
 894 EXPORT_SYMBOL(sas_port_mark_backlink);
 895
 896 /*
 897  * SAS remote PHY attributes.
 898  */
 899
 900 #define sas_rphy_show_simple(field, name, format_string, cast)          \
 901 static ssize_t                                                          \
 902 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
 903 {                                                                       \
 904         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
 905                                                                         \
 906         return snprintf(buf, 20, format_string, cast rphy->field);      \
 907 }
 908
 909 #define sas_rphy_simple_attr(field, name, format_string, type)          \
 910         sas_rphy_show_simple(field, name, format_string, (type))        \
 911 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
 912                 show_sas_rphy_##name, NULL)
 913
 914 #define sas_rphy_show_protocol(field, name)                             \
 915 static ssize_t                                                          \
 916 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
 917 {                                                                       \
 918         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
 919                                                                         \
 920         if (!rphy->field)                                       \
 921                 return snprintf(buf, 20, "none\n");                     \
 922         return get_sas_protocol_names(rphy->field, buf);        \
 923 }
 924
 925 #define sas_rphy_protocol_attr(field, name)                             \
 926         sas_rphy_show_protocol(field, name)                             \
 927 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
 928                 show_sas_rphy_##name, NULL)
 929
 930 static ssize_t
 931 show_sas_rphy_device_type(struct class_device *cdev, char *buf)
 932 {
 933         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
 934
 935         if (!rphy->identify.device_type)
 936                 return snprintf(buf, 20, "none\n");
 937         return get_sas_device_type_names(
 938                         rphy->identify.device_type, buf);
 939 }
 940
 941 static SAS_CLASS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
 942                 show_sas_rphy_device_type, NULL);
 943
 944 static ssize_t
 945 show_sas_rphy_enclosure_identifier(struct class_device *cdev, char *buf)
 946 {
 947         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
 948         struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
 949         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 950         struct sas_internal *i = to_sas_internal(shost->transportt);
 951         u64 identifier;
 952         int error;
 953
 954         /*
 955          * Only devices behind an expander are supported, because the
 956          * enclosure identifier is a SMP feature.
 957          */
 958         if (scsi_is_sas_phy_local(phy))
 959                 return -EINVAL;
 960
 961         error = i->f->get_enclosure_identifier(rphy, &identifier);
 962         if (error)
 963                 return error;
 964         return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
 965 }
 966
 967 static SAS_CLASS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
 968                 show_sas_rphy_enclosure_identifier, NULL);
 969
 970 static ssize_t
 971 show_sas_rphy_bay_identifier(struct class_device *cdev, char *buf)
 972 {
 973         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
 974         struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
 975         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 976         struct sas_internal *i = to_sas_internal(shost->transportt);
 977         int val;
 978
 979         if (scsi_is_sas_phy_local(phy))
 980                 return -EINVAL;
 981
 982         val = i->f->get_bay_identifier(rphy);
 983         if (val < 0)
 984                 return val;
 985         return sprintf(buf, "%d\n", val);
 986 }
 987
 988 static SAS_CLASS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
 989                 show_sas_rphy_bay_identifier, NULL);
 990
 991 sas_rphy_protocol_attr(identify.initiator_port_protocols,
 992                 initiator_port_protocols);
 993 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
 994 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 995                 unsigned long long);
 996 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 997
 998 /* only need 8 bytes of data plus header (4 or 8) */
 999 #define BUF_SIZE 64
1000
1001 int sas_read_port_mode_page(struct scsi_device *sdev)
1002 {
1003         char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1004         struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
1005         struct sas_end_device *rdev;
1006         struct scsi_mode_data mode_data;
1007         int res, error;
1008
1009         BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
1010
1011         rdev = rphy_to_end_device(rphy);
1012
1013         if (!buffer)
1014                 return -ENOMEM;
1015
1016         res = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
1017                               &mode_data, NULL);
1018
1019         error = -EINVAL;
1020         if (!scsi_status_is_good(res))
1021                 goto out;
1022
1023         msdata = buffer +  mode_data.header_length +
1024                 mode_data.block_descriptor_length;
1025
1026         if (msdata - buffer > BUF_SIZE - 8)
1027                 goto out;
1028
1029         error = 0;
1030
1031         rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1032         rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1033         rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1034
1035  out:
1036         kfree(buffer);
1037         return error;
1038 }
1039 EXPORT_SYMBOL(sas_read_port_mode_page);
1040
1041 static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1042                                "sas_end_device", NULL, NULL, NULL);
1043
1044 #define sas_end_dev_show_simple(field, name, format_string, cast)       \
1045 static ssize_t                                                          \
1046 show_sas_end_dev_##name(struct class_device *cdev, char *buf)           \
1047 {                                                                       \
1048         struct sas_rphy *rphy = transport_class_to_rphy(cdev);          \
1049         struct sas_end_device *rdev = rphy_to_end_device(rphy);         \
1050                                                                         \
1051         return snprintf(buf, 20, format_string, cast rdev->field);      \
1052 }
1053
1054 #define sas_end_dev_simple_attr(field, name, format_string, type)       \
1055         sas_end_dev_show_simple(field, name, format_string, (type))     \
1056 static SAS_CLASS_DEVICE_ATTR(end_dev, name, S_IRUGO,                    \
1057                 show_sas_end_dev_##name, NULL)
1058
1059 sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1060 sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1061                         "%d\n", int);
1062 sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1063                         "%d\n", int);
1064
1065 static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1066                                "sas_expander", NULL, NULL, NULL);
1067
1068 #define sas_expander_show_simple(field, name, format_string, cast)      \
1069 static ssize_t                                                          \
1070 show_sas_expander_##name(struct class_device *cdev, char *buf)          \
1071 {                                                                       \
1072         struct sas_rphy *rphy = transport_class_to_rphy(cdev);          \
1073         struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1074                                                                         \
1075         return snprintf(buf, 20, format_string, cast edev->field);      \
1076 }
1077
1078 #define sas_expander_simple_attr(field, name, format_string, type)      \
1079         sas_expander_show_simple(field, name, format_string, (type))    \
1080 static SAS_CLASS_DEVICE_ATTR(expander, name, S_IRUGO,                   \
1081                 show_sas_expander_##name, NULL)
1082
1083 sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1084 sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1085 sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1086 sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1087                          "%s\n", char *);
1088 sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1089 sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1090                          unsigned int);
1091 sas_expander_simple_attr(level, level, "%d\n", int);
1092
1093 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1094                 "sas_device", NULL, NULL, NULL);
1095
1096 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1097 {
1098         struct Scsi_Host *shost;
1099         struct sas_internal *i;
1100
1101         if (!scsi_is_sas_rphy(dev))
1102                 return 0;
1103         shost = dev_to_shost(dev->parent->parent);
1104
1105         if (!shost->transportt)
1106                 return 0;
1107         if (shost->transportt->host_attrs.ac.class !=
1108                         &sas_host_class.class)
1109                 return 0;
1110
1111         i = to_sas_internal(shost->transportt);
1112         return &i->rphy_attr_cont.ac == cont;
1113 }
1114
1115 static int sas_end_dev_match(struct attribute_container *cont,
1116                              struct device *dev)
1117 {
1118         struct Scsi_Host *shost;
1119         struct sas_internal *i;
1120         struct sas_rphy *rphy;
1121
1122         if (!scsi_is_sas_rphy(dev))
1123                 return 0;
1124         shost = dev_to_shost(dev->parent->parent);
1125         rphy = dev_to_rphy(dev);
1126
1127         if (!shost->transportt)
1128                 return 0;
1129         if (shost->transportt->host_attrs.ac.class !=
1130                         &sas_host_class.class)
1131                 return 0;
1132
1133         i = to_sas_internal(shost->transportt);
1134         return &i->end_dev_attr_cont.ac == cont &&
1135                 rphy->identify.device_type == SAS_END_DEVICE;
1136 }
1137
1138 static int sas_expander_match(struct attribute_container *cont,
1139                               struct device *dev)
1140 {
1141         struct Scsi_Host *shost;
1142         struct sas_internal *i;
1143         struct sas_rphy *rphy;
1144
1145         if (!scsi_is_sas_rphy(dev))
1146                 return 0;
1147         shost = dev_to_shost(dev->parent->parent);
1148         rphy = dev_to_rphy(dev);
1149
1150         if (!shost->transportt)
1151                 return 0;
1152         if (shost->transportt->host_attrs.ac.class !=
1153                         &sas_host_class.class)
1154                 return 0;
1155
1156         i = to_sas_internal(shost->transportt);
1157         return &i->expander_attr_cont.ac == cont &&
1158                 (rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1159                  rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1160 }
1161
1162 static void sas_expander_release(struct device *dev)
1163 {
1164         struct sas_rphy *rphy = dev_to_rphy(dev);
1165         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1166
1167         put_device(dev->parent);
1168         kfree(edev);
1169 }
1170
1171 static void sas_end_device_release(struct device *dev)
1172 {
1173         struct sas_rphy *rphy = dev_to_rphy(dev);
1174         struct sas_end_device *edev = rphy_to_end_device(rphy);
1175
1176         put_device(dev->parent);
1177         kfree(edev);
1178 }
1179
1180 /**
1181  * sas_rphy_initialize - common rphy intialization
1182  * @rphy:       rphy to initialise
1183  *
1184  * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1185  * initialise the common rphy component of each.
1186  */
1187 static void sas_rphy_initialize(struct sas_rphy *rphy)
1188 {
1189         INIT_LIST_HEAD(&rphy->list);
1190 }
1191
1192 /**
1193  * sas_end_device_alloc - allocate an rphy for an end device
1194  *
1195  * Allocates an SAS remote PHY structure, connected to @parent.
1196  *
1197  * Returns:
1198  *      SAS PHY allocated or %NULL if the allocation failed.
1199  */
1200 struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1201 {
1202         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1203         struct sas_end_device *rdev;
1204
1205         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1206         if (!rdev) {
1207                 return NULL;
1208         }
1209
1210         device_initialize(&rdev->rphy.dev);
1211         rdev->rphy.dev.parent = get_device(&parent->dev);
1212         rdev->rphy.dev.release = sas_end_device_release;
1213         if (scsi_is_sas_expander_device(parent->dev.parent)) {
1214                 struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1215                 sprintf(rdev->rphy.dev.bus_id, "end_device-%d:%d:%d",
1216                         shost->host_no, rphy->scsi_target_id, parent->port_identifier);
1217         } else
1218                 sprintf(rdev->rphy.dev.bus_id, "end_device-%d:%d",
1219                         shost->host_no, parent->port_identifier);
1220         rdev->rphy.identify.device_type = SAS_END_DEVICE;
1221         sas_rphy_initialize(&rdev->rphy);
1222         transport_setup_device(&rdev->rphy.dev);
1223
1224         return &rdev->rphy;
1225 }
1226 EXPORT_SYMBOL(sas_end_device_alloc);
1227
1228 /**
1229  * sas_expander_alloc - allocate an rphy for an end device
1230  *
1231  * Allocates an SAS remote PHY structure, connected to @parent.
1232  *
1233  * Returns:
1234  *      SAS PHY allocated or %NULL if the allocation failed.
1235  */
1236 struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1237                                     enum sas_device_type type)
1238 {
1239         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1240         struct sas_expander_device *rdev;
1241         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1242
1243         BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1244                type != SAS_FANOUT_EXPANDER_DEVICE);
1245
1246         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1247         if (!rdev) {
1248                 return NULL;
1249         }
1250
1251         device_initialize(&rdev->rphy.dev);
1252         rdev->rphy.dev.parent = get_device(&parent->dev);
1253         rdev->rphy.dev.release = sas_expander_release;
1254         mutex_lock(&sas_host->lock);
1255         rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1256         mutex_unlock(&sas_host->lock);
1257         sprintf(rdev->rphy.dev.bus_id, "expander-%d:%d",
1258                 shost->host_no, rdev->rphy.scsi_target_id);
1259         rdev->rphy.identify.device_type = type;
1260         sas_rphy_initialize(&rdev->rphy);
1261         transport_setup_device(&rdev->rphy.dev);
1262
1263         return &rdev->rphy;
1264 }
1265 EXPORT_SYMBOL(sas_expander_alloc);
1266
1267 /**
1268  * sas_rphy_add  --  add a SAS remote PHY to the device hierarchy
1269  * @rphy:       The remote PHY to be added
1270  *
1271  * Publishes a SAS remote PHY to the rest of the system.
1272  */
1273 int sas_rphy_add(struct sas_rphy *rphy)
1274 {
1275         struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1276         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1277         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1278         struct sas_identify *identify = &rphy->identify;
1279         int error;
1280
1281         if (parent->rphy)
1282                 return -ENXIO;
1283         parent->rphy = rphy;
1284
1285         error = device_add(&rphy->dev);
1286         if (error)
1287                 return error;
1288         transport_add_device(&rphy->dev);
1289         transport_configure_device(&rphy->dev);
1290
1291         mutex_lock(&sas_host->lock);
1292         list_add_tail(&rphy->list, &sas_host->rphy_list);
1293         if (identify->device_type == SAS_END_DEVICE &&
1294             (identify->target_port_protocols &
1295              (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
1296                 rphy->scsi_target_id = sas_host->next_target_id++;
1297         else if (identify->device_type == SAS_END_DEVICE)
1298                 rphy->scsi_target_id = -1;
1299         mutex_unlock(&sas_host->lock);
1300
1301         if (identify->device_type == SAS_END_DEVICE &&
1302             rphy->scsi_target_id != -1) {
1303                 scsi_scan_target(&rphy->dev, 0,
1304                                 rphy->scsi_target_id, SCAN_WILD_CARD, 0);
1305         }
1306
1307         return 0;
1308 }
1309 EXPORT_SYMBOL(sas_rphy_add);
1310
1311 /**
1312  * sas_rphy_free  --  free a SAS remote PHY
1313  * @rphy        SAS remote PHY to free
1314  *
1315  * Frees the specified SAS remote PHY.
1316  *
1317  * Note:
1318  *   This function must only be called on a remote
1319  *   PHY that has not sucessfully been added using
1320  *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1321  */
1322 void sas_rphy_free(struct sas_rphy *rphy)
1323 {
1324         struct device *dev = &rphy->dev;
1325         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1326         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1327
1328         mutex_lock(&sas_host->lock);
1329         list_del(&rphy->list);
1330         mutex_unlock(&sas_host->lock);
1331
1332         transport_destroy_device(dev);
1333
1334         put_device(dev);
1335 }
1336 EXPORT_SYMBOL(sas_rphy_free);
1337
1338 /**
1339  * sas_rphy_delete  --  remove and free SAS remote PHY
1340  * @rphy:       SAS remote PHY to remove and free
1341  *
1342  * Removes the specified SAS remote PHY and frees it.
1343  */
1344 void
1345 sas_rphy_delete(struct sas_rphy *rphy)
1346 {
1347         sas_rphy_remove(rphy);
1348         sas_rphy_free(rphy);
1349 }
1350 EXPORT_SYMBOL(sas_rphy_delete);
1351
1352 /**
1353  * sas_rphy_remove  --  remove SAS remote PHY
1354  * @rphy:       SAS remote phy to remove
1355  *
1356  * Removes the specified SAS remote PHY.
1357  */
1358 void
1359 sas_rphy_remove(struct sas_rphy *rphy)
1360 {
1361         struct device *dev = &rphy->dev;
1362         struct sas_port *parent = dev_to_sas_port(dev->parent);
1363
1364         switch (rphy->identify.device_type) {
1365         case SAS_END_DEVICE:
1366                 scsi_remove_target(dev);
1367                 break;
1368         case SAS_EDGE_EXPANDER_DEVICE:
1369         case SAS_FANOUT_EXPANDER_DEVICE:
1370                 sas_remove_children(dev);
1371                 break;
1372         default:
1373                 break;
1374         }
1375
1376         transport_remove_device(dev);
1377         device_del(dev);
1378
1379         parent->rphy = NULL;
1380 }
1381 EXPORT_SYMBOL(sas_rphy_remove);
1382
1383 /**
1384  * scsi_is_sas_rphy  --  check if a struct device represents a SAS remote PHY
1385  * @dev:        device to check
1386  *
1387  * Returns:
1388  *      %1 if the device represents a SAS remote PHY, %0 else
1389  */
1390 int scsi_is_sas_rphy(const struct device *dev)
1391 {
1392         return dev->release == sas_end_device_release ||
1393                 dev->release == sas_expander_release;
1394 }
1395 EXPORT_SYMBOL(scsi_is_sas_rphy);
1396
1397
1398 /*
1399  * SCSI scan helper
1400  */
1401
1402 static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1403                 uint id, uint lun)
1404 {
1405         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1406         struct sas_rphy *rphy;
1407
1408         mutex_lock(&sas_host->lock);
1409         list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1410                 if (rphy->identify.device_type != SAS_END_DEVICE ||
1411                     rphy->scsi_target_id == -1)
1412                         continue;
1413
1414                 if ((channel == SCAN_WILD_CARD || channel == 0) &&
1415                     (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1416                         scsi_scan_target(&rphy->dev, 0,
1417                                          rphy->scsi_target_id, lun, 1);
1418                 }
1419         }
1420         mutex_unlock(&sas_host->lock);
1421
1422         return 0;
1423 }
1424
1425
1426 /*
1427  * Setup / Teardown code
1428  */
1429
1430 #define SETUP_TEMPLATE(attrb, field, perm, test)                        \
1431         i->private_##attrb[count] = class_device_attr_##field;          \
1432         i->private_##attrb[count].attr.mode = perm;                     \
1433         i->attrb[count] = &i->private_##attrb[count];                   \
1434         if (test)                                                       \
1435                 count++
1436
1437 #define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)   \
1438         i->private_##attrb[count] = class_device_attr_##field;          \
1439         i->private_##attrb[count].attr.mode = perm;                     \
1440         if (ro_test) {                                                  \
1441                 i->private_##attrb[count].attr.mode = ro_perm;          \
1442                 i->private_##attrb[count].store = NULL;                 \
1443         }                                                               \
1444         i->attrb[count] = &i->private_##attrb[count];                   \
1445         if (test)                                                       \
1446                 count++
1447
1448 #define SETUP_RPORT_ATTRIBUTE(field)                                    \
1449         SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1450
1451 #define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)                     \
1452         SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1453
1454 #define SETUP_PHY_ATTRIBUTE(field)                                      \
1455         SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1456
1457 #define SETUP_PHY_ATTRIBUTE_RW(field)                                   \
1458         SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,       \
1459                         !i->f->set_phy_speed, S_IRUGO)
1460
1461 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)                    \
1462         SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,       \
1463                           !i->f->func, S_IRUGO)
1464
1465 #define SETUP_PORT_ATTRIBUTE(field)                                     \
1466         SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1467
1468 #define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)                       \
1469         SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1470
1471 #define SETUP_PHY_ATTRIBUTE_WRONLY(field)                               \
1472         SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1473
1474 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)                \
1475         SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1476
1477 #define SETUP_END_DEV_ATTRIBUTE(field)                                  \
1478         SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1479
1480 #define SETUP_EXPANDER_ATTRIBUTE(field)                                 \
1481         SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1482
1483 /**
1484  * sas_attach_transport  --  instantiate SAS transport template
1485  * @ft:         SAS transport class function template
1486  */
1487 struct scsi_transport_template *
1488 sas_attach_transport(struct sas_function_template *ft)
1489 {
1490         struct sas_internal *i;
1491         int count;
1492
1493         i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1494         if (!i)
1495                 return NULL;
1496
1497         i->t.user_scan = sas_user_scan;
1498
1499         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1500         i->t.host_attrs.ac.class = &sas_host_class.class;
1501         i->t.host_attrs.ac.match = sas_host_match;
1502         transport_container_register(&i->t.host_attrs);
1503         i->t.host_size = sizeof(struct sas_host_attrs);
1504
1505         i->phy_attr_cont.ac.class = &sas_phy_class.class;
1506         i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1507         i->phy_attr_cont.ac.match = sas_phy_match;
1508         transport_container_register(&i->phy_attr_cont);
1509
1510         i->port_attr_cont.ac.class = &sas_port_class.class;
1511         i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1512         i->port_attr_cont.ac.match = sas_port_match;
1513         transport_container_register(&i->port_attr_cont);
1514
1515         i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1516         i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1517         i->rphy_attr_cont.ac.match = sas_rphy_match;
1518         transport_container_register(&i->rphy_attr_cont);
1519
1520         i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1521         i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1522         i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1523         transport_container_register(&i->end_dev_attr_cont);
1524
1525         i->expander_attr_cont.ac.class = &sas_expander_class.class;
1526         i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1527         i->expander_attr_cont.ac.match = sas_expander_match;
1528         transport_container_register(&i->expander_attr_cont);
1529
1530         i->f = ft;
1531
1532         count = 0;
1533         SETUP_PORT_ATTRIBUTE(num_phys);
1534         i->host_attrs[count] = NULL;
1535
1536         count = 0;
1537         SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1538         SETUP_PHY_ATTRIBUTE(target_port_protocols);
1539         SETUP_PHY_ATTRIBUTE(device_type);
1540         SETUP_PHY_ATTRIBUTE(sas_address);
1541         SETUP_PHY_ATTRIBUTE(phy_identifier);
1542         //SETUP_PHY_ATTRIBUTE(port_identifier);
1543         SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1544         SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1545         SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1546         SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1547         SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1548
1549         SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1550         SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1551         SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1552         SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1553         SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1554         SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1555         SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1556         i->phy_attrs[count] = NULL;
1557
1558         count = 0;
1559         SETUP_PORT_ATTRIBUTE(num_phys);
1560         i->port_attrs[count] = NULL;
1561
1562         count = 0;
1563         SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1564         SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1565         SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1566         SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1567         SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1568         SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1569                                        get_enclosure_identifier);
1570         SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1571                                        get_bay_identifier);
1572         i->rphy_attrs[count] = NULL;
1573
1574         count = 0;
1575         SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1576         SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1577         SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1578         i->end_dev_attrs[count] = NULL;
1579
1580         count = 0;
1581         SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1582         SETUP_EXPANDER_ATTRIBUTE(product_id);
1583         SETUP_EXPANDER_ATTRIBUTE(product_rev);
1584         SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1585         SETUP_EXPANDER_ATTRIBUTE(component_id);
1586         SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1587         SETUP_EXPANDER_ATTRIBUTE(level);
1588         i->expander_attrs[count] = NULL;
1589
1590         return &i->t;
1591 }
1592 EXPORT_SYMBOL(sas_attach_transport);
1593
1594 /**
1595  * sas_release_transport  --  release SAS transport template instance
1596  * @t:          transport template instance
1597  */
1598 void sas_release_transport(struct scsi_transport_template *t)
1599 {
1600         struct sas_internal *i = to_sas_internal(t);
1601
1602         transport_container_unregister(&i->t.host_attrs);
1603         transport_container_unregister(&i->phy_attr_cont);
1604         transport_container_unregister(&i->port_attr_cont);
1605         transport_container_unregister(&i->rphy_attr_cont);
1606         transport_container_unregister(&i->end_dev_attr_cont);
1607         transport_container_unregister(&i->expander_attr_cont);
1608
1609         kfree(i);
1610 }
1611 EXPORT_SYMBOL(sas_release_transport);
1612
1613 static __init int sas_transport_init(void)
1614 {
1615         int error;
1616
1617         error = transport_class_register(&sas_host_class);
1618         if (error)
1619                 goto out;
1620         error = transport_class_register(&sas_phy_class);
1621         if (error)
1622                 goto out_unregister_transport;
1623         error = transport_class_register(&sas_port_class);
1624         if (error)
1625                 goto out_unregister_phy;
1626         error = transport_class_register(&sas_rphy_class);
1627         if (error)
1628                 goto out_unregister_port;
1629         error = transport_class_register(&sas_end_dev_class);
1630         if (error)
1631                 goto out_unregister_rphy;
1632         error = transport_class_register(&sas_expander_class);
1633         if (error)
1634                 goto out_unregister_end_dev;
1635
1636         return 0;
1637
1638  out_unregister_end_dev:
1639         transport_class_unregister(&sas_end_dev_class);
1640  out_unregister_rphy:
1641         transport_class_unregister(&sas_rphy_class);
1642  out_unregister_port:
1643         transport_class_unregister(&sas_port_class);
1644  out_unregister_phy:
1645         transport_class_unregister(&sas_phy_class);
1646  out_unregister_transport:
1647         transport_class_unregister(&sas_host_class);
1648  out:
1649         return error;
1650
1651 }
1652
1653 static void __exit sas_transport_exit(void)
1654 {
1655         transport_class_unregister(&sas_host_class);
1656         transport_class_unregister(&sas_phy_class);
1657         transport_class_unregister(&sas_port_class);
1658         transport_class_unregister(&sas_rphy_class);
1659         transport_class_unregister(&sas_end_dev_class);
1660         transport_class_unregister(&sas_expander_class);
1661 }
1662
1663 MODULE_AUTHOR("Christoph Hellwig");
1664 MODULE_DESCRIPTION("SAS Transport Attributes");
1665 MODULE_LICENSE("GPL");
1666
1667 module_init(sas_transport_init);
1668 module_exit(sas_transport_exit);