drivers/scsi/scsi_sysfs.c

   1 /*
   2  * scsi_sysfs.c
   3  *
   4  * SCSI sysfs interface routines.
   5  *
   6  * Created to pull SCSI mid layer sysfs routines into one file.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/slab.h>
  11 #include <linux/init.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/device.h>
  14 #include <linux/pm_runtime.h>
  15
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_device.h>
  18 #include <scsi/scsi_host.h>
  19 #include <scsi/scsi_tcq.h>
  20 #include <scsi/scsi_dh.h>
  21 #include <scsi/scsi_transport.h>
  22 #include <scsi/scsi_driver.h>
  23
  24 #include "scsi_priv.h"
  25 #include "scsi_logging.h"
  26
  27 static struct device_type scsi_dev_type;
  28
  29 static const struct {
  30         enum scsi_device_state  value;
  31         char                    *name;
  32 } sdev_states[] = {
  33         { SDEV_CREATED, "created" },
  34         { SDEV_RUNNING, "running" },
  35         { SDEV_CANCEL, "cancel" },
  36         { SDEV_DEL, "deleted" },
  37         { SDEV_QUIESCE, "quiesce" },
  38         { SDEV_OFFLINE, "offline" },
  39         { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  40         { SDEV_BLOCK,   "blocked" },
  41         { SDEV_CREATED_BLOCK, "created-blocked" },
  42 };
  43
  44 const char *scsi_device_state_name(enum scsi_device_state state)
  45 {
  46         int i;
  47         char *name = NULL;
  48
  49         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  50                 if (sdev_states[i].value == state) {
  51                         name = sdev_states[i].name;
  52                         break;
  53                 }
  54         }
  55         return name;
  56 }
  57
  58 static const struct {
  59         enum scsi_host_state    value;
  60         char                    *name;
  61 } shost_states[] = {
  62         { SHOST_CREATED, "created" },
  63         { SHOST_RUNNING, "running" },
  64         { SHOST_CANCEL, "cancel" },
  65         { SHOST_DEL, "deleted" },
  66         { SHOST_RECOVERY, "recovery" },
  67         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  68         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  69 };
  70 const char *scsi_host_state_name(enum scsi_host_state state)
  71 {
  72         int i;
  73         char *name = NULL;
  74
  75         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  76                 if (shost_states[i].value == state) {
  77                         name = shost_states[i].name;
  78                         break;
  79                 }
  80         }
  81         return name;
  82 }
  83
  84 static const struct {
  85         unsigned char   value;
  86         char            *name;
  87 } sdev_access_states[] = {
  88         { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
  89         { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
  90         { SCSI_ACCESS_STATE_STANDBY, "standby" },
  91         { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
  92         { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
  93         { SCSI_ACCESS_STATE_OFFLINE, "offline" },
  94         { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
  95 };
  96
  97 const char *scsi_access_state_name(unsigned char state)
  98 {
  99         int i;
 100         char *name = NULL;
 101
 102         for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
 103                 if (sdev_access_states[i].value == state) {
 104                         name = sdev_access_states[i].name;
 105                         break;
 106                 }
 107         }
 108         return name;
 109 }
 110
 111 static int check_set(unsigned long long *val, char *src)
 112 {
 113         char *last;
 114
 115         if (strncmp(src, "-", 20) == 0) {
 116                 *val = SCAN_WILD_CARD;
 117         } else {
 118                 /*
 119                  * Doesn't check for int overflow
 120                  */
 121                 *val = simple_strtoull(src, &last, 0);
 122                 if (*last != '\0')
 123                         return 1;
 124         }
 125         return 0;
 126 }
 127
 128 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 129 {
 130         char s1[15], s2[15], s3[17], junk;
 131         unsigned long long channel, id, lun;
 132         int res;
 133
 134         res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
 135         if (res != 3)
 136                 return -EINVAL;
 137         if (check_set(&channel, s1))
 138                 return -EINVAL;
 139         if (check_set(&id, s2))
 140                 return -EINVAL;
 141         if (check_set(&lun, s3))
 142                 return -EINVAL;
 143         if (shost->transportt->user_scan)
 144                 res = shost->transportt->user_scan(shost, channel, id, lun);
 145         else
 146                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 147         return res;
 148 }
 149
 150 /*
 151  * shost_show_function: macro to create an attr function that can be used to
 152  * show a non-bit field.
 153  */
 154 #define shost_show_function(name, field, format_string)                 \
 155 static ssize_t                                                          \
 156 show_##name (struct device *dev, struct device_attribute *attr,         \
 157              char *buf)                                                 \
 158 {                                                                       \
 159         struct Scsi_Host *shost = class_to_shost(dev);                  \
 160         return snprintf (buf, 20, format_string, shost->field);         \
 161 }
 162
 163 /*
 164  * shost_rd_attr: macro to create a function and attribute variable for a
 165  * read only field.
 166  */
 167 #define shost_rd_attr2(name, field, format_string)                      \
 168         shost_show_function(name, field, format_string)                 \
 169 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 170
 171 #define shost_rd_attr(field, format_string) \
 172 shost_rd_attr2(field, field, format_string)
 173
 174 /*
 175  * Create the actual show/store functions and data structures.
 176  */
 177
 178 static ssize_t
 179 store_scan(struct device *dev, struct device_attribute *attr,
 180            const char *buf, size_t count)
 181 {
 182         struct Scsi_Host *shost = class_to_shost(dev);
 183         int res;
 184
 185         res = scsi_scan(shost, buf);
 186         if (res == 0)
 187                 res = count;
 188         return res;
 189 };
 190 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 191
 192 static ssize_t
 193 store_shost_state(struct device *dev, struct device_attribute *attr,
 194                   const char *buf, size_t count)
 195 {
 196         int i;
 197         struct Scsi_Host *shost = class_to_shost(dev);
 198         enum scsi_host_state state = 0;
 199
 200         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 201                 const int len = strlen(shost_states[i].name);
 202                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 203                    buf[len] == '\n') {
 204                         state = shost_states[i].value;
 205                         break;
 206                 }
 207         }
 208         if (!state)
 209                 return -EINVAL;
 210
 211         if (scsi_host_set_state(shost, state))
 212                 return -EINVAL;
 213         return count;
 214 }
 215
 216 static ssize_t
 217 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 218 {
 219         struct Scsi_Host *shost = class_to_shost(dev);
 220         const char *name = scsi_host_state_name(shost->shost_state);
 221
 222         if (!name)
 223                 return -EINVAL;
 224
 225         return snprintf(buf, 20, "%s\n", name);
 226 }
 227
 228 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 229 struct device_attribute dev_attr_hstate =
 230         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 231
 232 static ssize_t
 233 show_shost_mode(unsigned int mode, char *buf)
 234 {
 235         ssize_t len = 0;
 236
 237         if (mode & MODE_INITIATOR)
 238                 len = sprintf(buf, "%s", "Initiator");
 239
 240         if (mode & MODE_TARGET)
 241                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 242
 243         len += sprintf(buf + len, "\n");
 244
 245         return len;
 246 }
 247
 248 static ssize_t
 249 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 250                           char *buf)
 251 {
 252         struct Scsi_Host *shost = class_to_shost(dev);
 253         unsigned int supported_mode = shost->hostt->supported_mode;
 254
 255         if (supported_mode == MODE_UNKNOWN)
 256                 /* by default this should be initiator */
 257                 supported_mode = MODE_INITIATOR;
 258
 259         return show_shost_mode(supported_mode, buf);
 260 }
 261
 262 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 263
 264 static ssize_t
 265 show_shost_active_mode(struct device *dev,
 266                        struct device_attribute *attr, char *buf)
 267 {
 268         struct Scsi_Host *shost = class_to_shost(dev);
 269
 270         if (shost->active_mode == MODE_UNKNOWN)
 271                 return snprintf(buf, 20, "unknown\n");
 272         else
 273                 return show_shost_mode(shost->active_mode, buf);
 274 }
 275
 276 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 277
 278 static int check_reset_type(const char *str)
 279 {
 280         if (sysfs_streq(str, "adapter"))
 281                 return SCSI_ADAPTER_RESET;
 282         else if (sysfs_streq(str, "firmware"))
 283                 return SCSI_FIRMWARE_RESET;
 284         else
 285                 return 0;
 286 }
 287
 288 static ssize_t
 289 store_host_reset(struct device *dev, struct device_attribute *attr,
 290                 const char *buf, size_t count)
 291 {
 292         struct Scsi_Host *shost = class_to_shost(dev);
 293         struct scsi_host_template *sht = shost->hostt;
 294         int ret = -EINVAL;
 295         int type;
 296
 297         type = check_reset_type(buf);
 298         if (!type)
 299                 goto exit_store_host_reset;
 300
 301         if (sht->host_reset)
 302                 ret = sht->host_reset(shost, type);
 303
 304 exit_store_host_reset:
 305         if (ret == 0)
 306                 ret = count;
 307         return ret;
 308 }
 309
 310 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 311
 312 static ssize_t
 313 show_shost_eh_deadline(struct device *dev,
 314                       struct device_attribute *attr, char *buf)
 315 {
 316         struct Scsi_Host *shost = class_to_shost(dev);
 317
 318         if (shost->eh_deadline == -1)
 319                 return snprintf(buf, strlen("off") + 2, "off\n");
 320         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 321 }
 322
 323 static ssize_t
 324 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 325                 const char *buf, size_t count)
 326 {
 327         struct Scsi_Host *shost = class_to_shost(dev);
 328         int ret = -EINVAL;
 329         unsigned long deadline, flags;
 330
 331         if (shost->transportt &&
 332             (shost->transportt->eh_strategy_handler ||
 333              !shost->hostt->eh_host_reset_handler))
 334                 return ret;
 335
 336         if (!strncmp(buf, "off", strlen("off")))
 337                 deadline = -1;
 338         else {
 339                 ret = kstrtoul(buf, 10, &deadline);
 340                 if (ret)
 341                         return ret;
 342                 if (deadline * HZ > UINT_MAX)
 343                         return -EINVAL;
 344         }
 345
 346         spin_lock_irqsave(shost->host_lock, flags);
 347         if (scsi_host_in_recovery(shost))
 348                 ret = -EBUSY;
 349         else {
 350                 if (deadline == -1)
 351                         shost->eh_deadline = -1;
 352                 else
 353                         shost->eh_deadline = deadline * HZ;
 354
 355                 ret = count;
 356         }
 357         spin_unlock_irqrestore(shost->host_lock, flags);
 358
 359         return ret;
 360 }
 361
 362 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 363
 364 shost_rd_attr(use_blk_mq, "%d\n");
 365 shost_rd_attr(unique_id, "%u\n");
 366 shost_rd_attr(cmd_per_lun, "%hd\n");
 367 shost_rd_attr(can_queue, "%hd\n");
 368 shost_rd_attr(sg_tablesize, "%hu\n");
 369 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 370 shost_rd_attr(unchecked_isa_dma, "%d\n");
 371 shost_rd_attr(prot_capabilities, "%u\n");
 372 shost_rd_attr(prot_guard_type, "%hd\n");
 373 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 374
 375 static ssize_t
 376 show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
 377 {
 378         struct Scsi_Host *shost = class_to_shost(dev);
 379         return snprintf(buf, 20, "%d\n", atomic_read(&shost->host_busy));
 380 }
 381 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 382
 383 static struct attribute *scsi_sysfs_shost_attrs[] = {
 384         &dev_attr_use_blk_mq.attr,
 385         &dev_attr_unique_id.attr,
 386         &dev_attr_host_busy.attr,
 387         &dev_attr_cmd_per_lun.attr,
 388         &dev_attr_can_queue.attr,
 389         &dev_attr_sg_tablesize.attr,
 390         &dev_attr_sg_prot_tablesize.attr,
 391         &dev_attr_unchecked_isa_dma.attr,
 392         &dev_attr_proc_name.attr,
 393         &dev_attr_scan.attr,
 394         &dev_attr_hstate.attr,
 395         &dev_attr_supported_mode.attr,
 396         &dev_attr_active_mode.attr,
 397         &dev_attr_prot_capabilities.attr,
 398         &dev_attr_prot_guard_type.attr,
 399         &dev_attr_host_reset.attr,
 400         &dev_attr_eh_deadline.attr,
 401         NULL
 402 };
 403
 404 struct attribute_group scsi_shost_attr_group = {
 405         .attrs =        scsi_sysfs_shost_attrs,
 406 };
 407
 408 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 409         &scsi_shost_attr_group,
 410         NULL
 411 };
 412
 413 static void scsi_device_cls_release(struct device *class_dev)
 414 {
 415         struct scsi_device *sdev;
 416
 417         sdev = class_to_sdev(class_dev);
 418         put_device(&sdev->sdev_gendev);
 419 }
 420
 421 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 422 {
 423         struct scsi_device *sdev;
 424         struct device *parent;
 425         struct list_head *this, *tmp;
 426         unsigned long flags;
 427
 428         sdev = container_of(work, struct scsi_device, ew.work);
 429
 430         scsi_dh_release_device(sdev);
 431
 432         parent = sdev->sdev_gendev.parent;
 433
 434         spin_lock_irqsave(sdev->host->host_lock, flags);
 435         list_del(&sdev->siblings);
 436         list_del(&sdev->same_target_siblings);
 437         list_del(&sdev->starved_entry);
 438         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 439
 440         cancel_work_sync(&sdev->event_work);
 441
 442         list_for_each_safe(this, tmp, &sdev->event_list) {
 443                 struct scsi_event *evt;
 444
 445                 evt = list_entry(this, struct scsi_event, node);
 446                 list_del(&evt->node);
 447                 kfree(evt);
 448         }
 449
 450         blk_put_queue(sdev->request_queue);
 451         /* NULL queue means the device can't be used */
 452         sdev->request_queue = NULL;
 453
 454         kfree(sdev->vpd_pg83);
 455         kfree(sdev->vpd_pg80);
 456         kfree(sdev->inquiry);
 457         kfree(sdev);
 458
 459         if (parent)
 460                 put_device(parent);
 461 }
 462
 463 static void scsi_device_dev_release(struct device *dev)
 464 {
 465         struct scsi_device *sdp = to_scsi_device(dev);
 466         execute_in_process_context(scsi_device_dev_release_usercontext,
 467                                    &sdp->ew);
 468 }
 469
 470 static struct class sdev_class = {
 471         .name           = "scsi_device",
 472         .dev_release    = scsi_device_cls_release,
 473 };
 474
 475 /* all probing is done in the individual ->probe routines */
 476 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 477 {
 478         struct scsi_device *sdp;
 479
 480         if (dev->type != &scsi_dev_type)
 481                 return 0;
 482
 483         sdp = to_scsi_device(dev);
 484         if (sdp->no_uld_attach)
 485                 return 0;
 486         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 487 }
 488
 489 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 490 {
 491         struct scsi_device *sdev;
 492
 493         if (dev->type != &scsi_dev_type)
 494                 return 0;
 495
 496         sdev = to_scsi_device(dev);
 497
 498         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 499         return 0;
 500 }
 501
 502 struct bus_type scsi_bus_type = {
 503         .name           = "scsi",
 504         .match          = scsi_bus_match,
 505         .uevent         = scsi_bus_uevent,
 506 #ifdef CONFIG_PM
 507         .pm             = &scsi_bus_pm_ops,
 508 #endif
 509 };
 510 EXPORT_SYMBOL_GPL(scsi_bus_type);
 511
 512 int scsi_sysfs_register(void)
 513 {
 514         int error;
 515
 516         error = bus_register(&scsi_bus_type);
 517         if (!error) {
 518                 error = class_register(&sdev_class);
 519                 if (error)
 520                         bus_unregister(&scsi_bus_type);
 521         }
 522
 523         return error;
 524 }
 525
 526 void scsi_sysfs_unregister(void)
 527 {
 528         class_unregister(&sdev_class);
 529         bus_unregister(&scsi_bus_type);
 530 }
 531
 532 /*
 533  * sdev_show_function: macro to create an attr function that can be used to
 534  * show a non-bit field.
 535  */
 536 #define sdev_show_function(field, format_string)                                \
 537 static ssize_t                                                          \
 538 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 539                    char *buf)                                           \
 540 {                                                                       \
 541         struct scsi_device *sdev;                                       \
 542         sdev = to_scsi_device(dev);                                     \
 543         return snprintf (buf, 20, format_string, sdev->field);          \
 544 }                                                                       \
 545
 546 /*
 547  * sdev_rd_attr: macro to create a function and attribute variable for a
 548  * read only field.
 549  */
 550 #define sdev_rd_attr(field, format_string)                              \
 551         sdev_show_function(field, format_string)                        \
 552 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 553
 554
 555 /*
 556  * sdev_rw_attr: create a function and attribute variable for a
 557  * read/write field.
 558  */
 559 #define sdev_rw_attr(field, format_string)                              \
 560         sdev_show_function(field, format_string)                                \
 561                                                                         \
 562 static ssize_t                                                          \
 563 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 564                     const char *buf, size_t count)                      \
 565 {                                                                       \
 566         struct scsi_device *sdev;                                       \
 567         sdev = to_scsi_device(dev);                                     \
 568         sscanf (buf, format_string, &sdev->field);                      \
 569         return count;                                                   \
 570 }                                                                       \
 571 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 572
 573 /* Currently we don't export bit fields, but we might in future,
 574  * so leave this code in */
 575 #if 0
 576 /*
 577  * sdev_rd_attr: create a function and attribute variable for a
 578  * read/write bit field.
 579  */
 580 #define sdev_rw_attr_bit(field)                                         \
 581         sdev_show_function(field, "%d\n")                                       \
 582                                                                         \
 583 static ssize_t                                                          \
 584 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 585                     const char *buf, size_t count)                      \
 586 {                                                                       \
 587         int ret;                                                        \
 588         struct scsi_device *sdev;                                       \
 589         ret = scsi_sdev_check_buf_bit(buf);                             \
 590         if (ret >= 0)   {                                               \
 591                 sdev = to_scsi_device(dev);                             \
 592                 sdev->field = ret;                                      \
 593                 ret = count;                                            \
 594         }                                                               \
 595         return ret;                                                     \
 596 }                                                                       \
 597 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 598
 599 /*
 600  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 601  * else return -EINVAL.
 602  */
 603 static int scsi_sdev_check_buf_bit(const char *buf)
 604 {
 605         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 606                 if (buf[0] == '1')
 607                         return 1;
 608                 else if (buf[0] == '0')
 609                         return 0;
 610                 else
 611                         return -EINVAL;
 612         } else
 613                 return -EINVAL;
 614 }
 615 #endif
 616 /*
 617  * Create the actual show/store functions and data structures.
 618  */
 619 sdev_rd_attr (type, "%d\n");
 620 sdev_rd_attr (scsi_level, "%d\n");
 621 sdev_rd_attr (vendor, "%.8s\n");
 622 sdev_rd_attr (model, "%.16s\n");
 623 sdev_rd_attr (rev, "%.4s\n");
 624
 625 static ssize_t
 626 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 627                 char *buf)
 628 {
 629         struct scsi_device *sdev = to_scsi_device(dev);
 630         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
 631 }
 632 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 633
 634 static ssize_t
 635 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 636                 char *buf)
 637 {
 638         struct scsi_device *sdev = to_scsi_device(dev);
 639         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 640 }
 641 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 642
 643 /*
 644  * TODO: can we make these symlinks to the block layer ones?
 645  */
 646 static ssize_t
 647 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 648 {
 649         struct scsi_device *sdev;
 650         sdev = to_scsi_device(dev);
 651         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 652 }
 653
 654 static ssize_t
 655 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 656                     const char *buf, size_t count)
 657 {
 658         struct scsi_device *sdev;
 659         int timeout;
 660         sdev = to_scsi_device(dev);
 661         sscanf (buf, "%d\n", &timeout);
 662         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 663         return count;
 664 }
 665 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 666
 667 static ssize_t
 668 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 669 {
 670         struct scsi_device *sdev;
 671         sdev = to_scsi_device(dev);
 672         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 673 }
 674
 675 static ssize_t
 676 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 677                     const char *buf, size_t count)
 678 {
 679         struct scsi_device *sdev;
 680         unsigned int eh_timeout;
 681         int err;
 682
 683         if (!capable(CAP_SYS_ADMIN))
 684                 return -EACCES;
 685
 686         sdev = to_scsi_device(dev);
 687         err = kstrtouint(buf, 10, &eh_timeout);
 688         if (err)
 689                 return err;
 690         sdev->eh_timeout = eh_timeout * HZ;
 691
 692         return count;
 693 }
 694 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 695
 696 static ssize_t
 697 store_rescan_field (struct device *dev, struct device_attribute *attr,
 698                     const char *buf, size_t count)
 699 {
 700         scsi_rescan_device(dev);
 701         return count;
 702 }
 703 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 704
 705 static ssize_t
 706 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 707                   const char *buf, size_t count)
 708 {
 709         if (device_remove_file_self(dev, attr))
 710                 scsi_remove_device(to_scsi_device(dev));
 711         return count;
 712 };
 713 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 714
 715 static ssize_t
 716 store_state_field(struct device *dev, struct device_attribute *attr,
 717                   const char *buf, size_t count)
 718 {
 719         int i;
 720         struct scsi_device *sdev = to_scsi_device(dev);
 721         enum scsi_device_state state = 0;
 722
 723         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 724                 const int len = strlen(sdev_states[i].name);
 725                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 726                    buf[len] == '\n') {
 727                         state = sdev_states[i].value;
 728                         break;
 729                 }
 730         }
 731         if (!state)
 732                 return -EINVAL;
 733
 734         if (scsi_device_set_state(sdev, state))
 735                 return -EINVAL;
 736         return count;
 737 }
 738
 739 static ssize_t
 740 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 741 {
 742         struct scsi_device *sdev = to_scsi_device(dev);
 743         const char *name = scsi_device_state_name(sdev->sdev_state);
 744
 745         if (!name)
 746                 return -EINVAL;
 747
 748         return snprintf(buf, 20, "%s\n", name);
 749 }
 750
 751 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 752
 753 static ssize_t
 754 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 755                       char *buf)
 756 {
 757         struct scsi_device *sdev = to_scsi_device(dev);
 758         const char *name = "none";
 759
 760         if (sdev->simple_tags)
 761                 name = "simple";
 762
 763         return snprintf(buf, 20, "%s\n", name);
 764 }
 765
 766 static ssize_t
 767 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 768                        const char *buf, size_t count)
 769 {
 770         struct scsi_device *sdev = to_scsi_device(dev);
 771
 772         if (!sdev->tagged_supported)
 773                 return -EINVAL;
 774
 775         sdev_printk(KERN_INFO, sdev,
 776                     "ignoring write to deprecated queue_type attribute");
 777         return count;
 778 }
 779
 780 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 781                    store_queue_type_field);
 782
 783 #define sdev_vpd_pg_attr(_page)                                         \
 784 static ssize_t                                                  \
 785 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 786                  struct bin_attribute *bin_attr,                        \
 787                  char *buf, loff_t off, size_t count)                   \
 788 {                                                                       \
 789         struct device *dev = container_of(kobj, struct device, kobj);   \
 790         struct scsi_device *sdev = to_scsi_device(dev);                 \
 791         int ret;                                                        \
 792         if (!sdev->vpd_##_page)                                         \
 793                 return -EINVAL;                                         \
 794         rcu_read_lock();                                                \
 795         ret = memory_read_from_buffer(buf, count, &off,                 \
 796                                       rcu_dereference(sdev->vpd_##_page), \
 797                                        sdev->vpd_##_page##_len);        \
 798         rcu_read_unlock();                                              \
 799         return ret;                                             \
 800 }                                                                       \
 801 static struct bin_attribute dev_attr_vpd_##_page = {            \
 802         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 803         .size = 0,                                                      \
 804         .read = show_vpd_##_page,                                       \
 805 };
 806
 807 sdev_vpd_pg_attr(pg83);
 808 sdev_vpd_pg_attr(pg80);
 809
 810 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 811                             struct bin_attribute *bin_attr,
 812                             char *buf, loff_t off, size_t count)
 813 {
 814         struct device *dev = container_of(kobj, struct device, kobj);
 815         struct scsi_device *sdev = to_scsi_device(dev);
 816
 817         if (!sdev->inquiry)
 818                 return -EINVAL;
 819
 820         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 821                                        sdev->inquiry_len);
 822 }
 823
 824 static struct bin_attribute dev_attr_inquiry = {
 825         .attr = {
 826                 .name = "inquiry",
 827                 .mode = S_IRUGO,
 828         },
 829         .size = 0,
 830         .read = show_inquiry,
 831 };
 832
 833 static ssize_t
 834 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 835                         char *buf)
 836 {
 837         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 838 }
 839
 840 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 841
 842 #define show_sdev_iostat(field)                                         \
 843 static ssize_t                                                          \
 844 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 845                     char *buf)                                          \
 846 {                                                                       \
 847         struct scsi_device *sdev = to_scsi_device(dev);                 \
 848         unsigned long long count = atomic_read(&sdev->field);           \
 849         return snprintf(buf, 20, "0x%llx\n", count);                    \
 850 }                                                                       \
 851 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 852
 853 show_sdev_iostat(iorequest_cnt);
 854 show_sdev_iostat(iodone_cnt);
 855 show_sdev_iostat(ioerr_cnt);
 856
 857 static ssize_t
 858 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 859 {
 860         struct scsi_device *sdev;
 861         sdev = to_scsi_device(dev);
 862         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 863 }
 864 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 865
 866 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 867 static ssize_t                                                          \
 868 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 869                      char *buf)                                         \
 870 {                                                                       \
 871         struct scsi_device *sdev = to_scsi_device(dev);                 \
 872         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 873         return snprintf(buf, 20, "%d\n", val);                          \
 874 }
 875
 876 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 877 static ssize_t                                                          \
 878 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 879                       const char *buf, size_t count)                    \
 880 {                                                                       \
 881         struct scsi_device *sdev = to_scsi_device(dev);                 \
 882         int val = simple_strtoul(buf, NULL, 0);                         \
 883         if (val == 0)                                                   \
 884                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 885         else if (val == 1)                                              \
 886                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 887         else                                                            \
 888                 return -EINVAL;                                         \
 889         return count;                                                   \
 890 }
 891
 892 #define DECLARE_EVT(name, Cap_name)                                     \
 893         DECLARE_EVT_SHOW(name, Cap_name)                                \
 894         DECLARE_EVT_STORE(name, Cap_name)                               \
 895         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 896                            sdev_store_evt_##name);
 897 #define REF_EVT(name) &dev_attr_evt_##name.attr
 898
 899 DECLARE_EVT(media_change, MEDIA_CHANGE)
 900 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 901 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 902 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 903 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 904 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 905
 906 static ssize_t
 907 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 908                        const char *buf, size_t count)
 909 {
 910         int depth, retval;
 911         struct scsi_device *sdev = to_scsi_device(dev);
 912         struct scsi_host_template *sht = sdev->host->hostt;
 913
 914         if (!sht->change_queue_depth)
 915                 return -EINVAL;
 916
 917         depth = simple_strtoul(buf, NULL, 0);
 918
 919         if (depth < 1 || depth > sdev->host->can_queue)
 920                 return -EINVAL;
 921
 922         retval = sht->change_queue_depth(sdev, depth);
 923         if (retval < 0)
 924                 return retval;
 925
 926         sdev->max_queue_depth = sdev->queue_depth;
 927
 928         return count;
 929 }
 930 sdev_show_function(queue_depth, "%d\n");
 931
 932 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 933                    sdev_store_queue_depth);
 934
 935 static ssize_t
 936 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
 937                     char *buf)
 938 {
 939         struct scsi_device *sdev = to_scsi_device(dev);
 940         ssize_t count;
 941
 942         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
 943         if (count > 0) {
 944                 buf[count] = '\n';
 945                 count++;
 946         }
 947         return count;
 948 }
 949 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
 950
 951 #ifdef CONFIG_SCSI_DH
 952 static ssize_t
 953 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
 954                    char *buf)
 955 {
 956         struct scsi_device *sdev = to_scsi_device(dev);
 957
 958         if (!sdev->handler)
 959                 return snprintf(buf, 20, "detached\n");
 960
 961         return snprintf(buf, 20, "%s\n", sdev->handler->name);
 962 }
 963
 964 static ssize_t
 965 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
 966                     const char *buf, size_t count)
 967 {
 968         struct scsi_device *sdev = to_scsi_device(dev);
 969         int err = -EINVAL;
 970
 971         if (sdev->sdev_state == SDEV_CANCEL ||
 972             sdev->sdev_state == SDEV_DEL)
 973                 return -ENODEV;
 974
 975         if (!sdev->handler) {
 976                 /*
 977                  * Attach to a device handler
 978                  */
 979                 err = scsi_dh_attach(sdev->request_queue, buf);
 980         } else if (!strncmp(buf, "activate", 8)) {
 981                 /*
 982                  * Activate a device handler
 983                  */
 984                 if (sdev->handler->activate)
 985                         err = sdev->handler->activate(sdev, NULL, NULL);
 986                 else
 987                         err = 0;
 988         } else if (!strncmp(buf, "detach", 6)) {
 989                 /*
 990                  * Detach from a device handler
 991                  */
 992                 sdev_printk(KERN_WARNING, sdev,
 993                             "can't detach handler %s.\n",
 994                             sdev->handler->name);
 995                 err = -EINVAL;
 996         }
 997
 998         return err < 0 ? err : count;
 999 }
1000
1001 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1002                    sdev_store_dh_state);
1003
1004 static ssize_t
1005 sdev_show_access_state(struct device *dev,
1006                        struct device_attribute *attr,
1007                        char *buf)
1008 {
1009         struct scsi_device *sdev = to_scsi_device(dev);
1010         unsigned char access_state;
1011         const char *access_state_name;
1012
1013         if (!sdev->handler)
1014                 return -EINVAL;
1015
1016         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1017         access_state_name = scsi_access_state_name(access_state);
1018
1019         return sprintf(buf, "%s\n",
1020                        access_state_name ? access_state_name : "unknown");
1021 }
1022 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1023
1024 static ssize_t
1025 sdev_show_preferred_path(struct device *dev,
1026                          struct device_attribute *attr,
1027                          char *buf)
1028 {
1029         struct scsi_device *sdev = to_scsi_device(dev);
1030
1031         if (!sdev->handler)
1032                 return -EINVAL;
1033
1034         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1035                 return sprintf(buf, "1\n");
1036         else
1037                 return sprintf(buf, "0\n");
1038 }
1039 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1040 #endif
1041
1042 static ssize_t
1043 sdev_show_queue_ramp_up_period(struct device *dev,
1044                                struct device_attribute *attr,
1045                                char *buf)
1046 {
1047         struct scsi_device *sdev;
1048         sdev = to_scsi_device(dev);
1049         return snprintf(buf, 20, "%u\n",
1050                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1051 }
1052
1053 static ssize_t
1054 sdev_store_queue_ramp_up_period(struct device *dev,
1055                                 struct device_attribute *attr,
1056                                 const char *buf, size_t count)
1057 {
1058         struct scsi_device *sdev = to_scsi_device(dev);
1059         unsigned int period;
1060
1061         if (kstrtouint(buf, 10, &period))
1062                 return -EINVAL;
1063
1064         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1065         return count;
1066 }
1067
1068 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1069                    sdev_show_queue_ramp_up_period,
1070                    sdev_store_queue_ramp_up_period);
1071
1072 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1073                                          struct attribute *attr, int i)
1074 {
1075         struct device *dev = container_of(kobj, struct device, kobj);
1076         struct scsi_device *sdev = to_scsi_device(dev);
1077
1078
1079         if (attr == &dev_attr_queue_depth.attr &&
1080             !sdev->host->hostt->change_queue_depth)
1081                 return S_IRUGO;
1082
1083         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1084             !sdev->host->hostt->change_queue_depth)
1085                 return 0;
1086
1087 #ifdef CONFIG_SCSI_DH
1088         if (attr == &dev_attr_access_state.attr &&
1089             !sdev->handler)
1090                 return 0;
1091         if (attr == &dev_attr_preferred_path.attr &&
1092             !sdev->handler)
1093                 return 0;
1094 #endif
1095         return attr->mode;
1096 }
1097
1098 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1099                                              struct bin_attribute *attr, int i)
1100 {
1101         struct device *dev = container_of(kobj, struct device, kobj);
1102         struct scsi_device *sdev = to_scsi_device(dev);
1103
1104
1105         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1106                 return 0;
1107
1108         if (attr == &dev_attr_vpd_pg83 && sdev->vpd_pg83)
1109                 return 0;
1110
1111         return S_IRUGO;
1112 }
1113
1114 /* Default template for device attributes.  May NOT be modified */
1115 static struct attribute *scsi_sdev_attrs[] = {
1116         &dev_attr_device_blocked.attr,
1117         &dev_attr_type.attr,
1118         &dev_attr_scsi_level.attr,
1119         &dev_attr_device_busy.attr,
1120         &dev_attr_vendor.attr,
1121         &dev_attr_model.attr,
1122         &dev_attr_rev.attr,
1123         &dev_attr_rescan.attr,
1124         &dev_attr_delete.attr,
1125         &dev_attr_state.attr,
1126         &dev_attr_timeout.attr,
1127         &dev_attr_eh_timeout.attr,
1128         &dev_attr_iocounterbits.attr,
1129         &dev_attr_iorequest_cnt.attr,
1130         &dev_attr_iodone_cnt.attr,
1131         &dev_attr_ioerr_cnt.attr,
1132         &dev_attr_modalias.attr,
1133         &dev_attr_queue_depth.attr,
1134         &dev_attr_queue_type.attr,
1135         &dev_attr_wwid.attr,
1136 #ifdef CONFIG_SCSI_DH
1137         &dev_attr_dh_state.attr,
1138         &dev_attr_access_state.attr,
1139         &dev_attr_preferred_path.attr,
1140 #endif
1141         &dev_attr_queue_ramp_up_period.attr,
1142         REF_EVT(media_change),
1143         REF_EVT(inquiry_change_reported),
1144         REF_EVT(capacity_change_reported),
1145         REF_EVT(soft_threshold_reached),
1146         REF_EVT(mode_parameter_change_reported),
1147         REF_EVT(lun_change_reported),
1148         NULL
1149 };
1150
1151 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1152         &dev_attr_vpd_pg83,
1153         &dev_attr_vpd_pg80,
1154         &dev_attr_inquiry,
1155         NULL
1156 };
1157 static struct attribute_group scsi_sdev_attr_group = {
1158         .attrs =        scsi_sdev_attrs,
1159         .bin_attrs =    scsi_sdev_bin_attrs,
1160         .is_visible =   scsi_sdev_attr_is_visible,
1161         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1162 };
1163
1164 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1165         &scsi_sdev_attr_group,
1166         NULL
1167 };
1168
1169 static int scsi_target_add(struct scsi_target *starget)
1170 {
1171         int error;
1172
1173         if (starget->state != STARGET_CREATED)
1174                 return 0;
1175
1176         error = device_add(&starget->dev);
1177         if (error) {
1178                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1179                 return error;
1180         }
1181         transport_add_device(&starget->dev);
1182         starget->state = STARGET_RUNNING;
1183
1184         pm_runtime_set_active(&starget->dev);
1185         pm_runtime_enable(&starget->dev);
1186         device_enable_async_suspend(&starget->dev);
1187
1188         return 0;
1189 }
1190
1191 /**
1192  * scsi_sysfs_add_sdev - add scsi device to sysfs
1193  * @sdev:       scsi_device to add
1194  *
1195  * Return value:
1196  *      0 on Success / non-zero on Failure
1197  **/
1198 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1199 {
1200         int error, i;
1201         struct request_queue *rq = sdev->request_queue;
1202         struct scsi_target *starget = sdev->sdev_target;
1203
1204         error = scsi_device_set_state(sdev, SDEV_RUNNING);
1205         if (error)
1206                 return error;
1207
1208         error = scsi_target_add(starget);
1209         if (error)
1210                 return error;
1211
1212         transport_configure_device(&starget->dev);
1213
1214         device_enable_async_suspend(&sdev->sdev_gendev);
1215         scsi_autopm_get_target(starget);
1216         pm_runtime_set_active(&sdev->sdev_gendev);
1217         pm_runtime_forbid(&sdev->sdev_gendev);
1218         pm_runtime_enable(&sdev->sdev_gendev);
1219         scsi_autopm_put_target(starget);
1220
1221         scsi_autopm_get_device(sdev);
1222
1223         error = scsi_dh_add_device(sdev);
1224         if (error)
1225                 /*
1226                  * device_handler is optional, so any error can be ignored
1227                  */
1228                 sdev_printk(KERN_INFO, sdev,
1229                                 "failed to add device handler: %d\n", error);
1230
1231         error = device_add(&sdev->sdev_gendev);
1232         if (error) {
1233                 sdev_printk(KERN_INFO, sdev,
1234                                 "failed to add device: %d\n", error);
1235                 scsi_dh_remove_device(sdev);
1236                 return error;
1237         }
1238
1239         device_enable_async_suspend(&sdev->sdev_dev);
1240         error = device_add(&sdev->sdev_dev);
1241         if (error) {
1242                 sdev_printk(KERN_INFO, sdev,
1243                                 "failed to add class device: %d\n", error);
1244                 scsi_dh_remove_device(sdev);
1245                 device_del(&sdev->sdev_gendev);
1246                 return error;
1247         }
1248         transport_add_device(&sdev->sdev_gendev);
1249         sdev->is_visible = 1;
1250
1251         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1252
1253         if (error)
1254                 /* we're treating error on bsg register as non-fatal,
1255                  * so pretend nothing went wrong */
1256                 sdev_printk(KERN_INFO, sdev,
1257                             "Failed to register bsg queue, errno=%d\n", error);
1258
1259         /* add additional host specific attributes */
1260         if (sdev->host->hostt->sdev_attrs) {
1261                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1262                         error = device_create_file(&sdev->sdev_gendev,
1263                                         sdev->host->hostt->sdev_attrs[i]);
1264                         if (error)
1265                                 return error;
1266                 }
1267         }
1268
1269         scsi_autopm_put_device(sdev);
1270         return error;
1271 }
1272
1273 void __scsi_remove_device(struct scsi_device *sdev)
1274 {
1275         struct device *dev = &sdev->sdev_gendev;
1276
1277         /*
1278          * This cleanup path is not reentrant and while it is impossible
1279          * to get a new reference with scsi_device_get() someone can still
1280          * hold a previously acquired one.
1281          */
1282         if (sdev->sdev_state == SDEV_DEL)
1283                 return;
1284
1285         if (sdev->is_visible) {
1286                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
1287                         return;
1288
1289                 bsg_unregister_queue(sdev->request_queue);
1290                 device_unregister(&sdev->sdev_dev);
1291                 transport_remove_device(dev);
1292                 scsi_dh_remove_device(sdev);
1293                 device_del(dev);
1294         } else
1295                 put_device(&sdev->sdev_dev);
1296
1297         /*
1298          * Stop accepting new requests and wait until all queuecommand() and
1299          * scsi_run_queue() invocations have finished before tearing down the
1300          * device.
1301          */
1302         scsi_device_set_state(sdev, SDEV_DEL);
1303         blk_cleanup_queue(sdev->request_queue);
1304         cancel_work_sync(&sdev->requeue_work);
1305
1306         if (sdev->host->hostt->slave_destroy)
1307                 sdev->host->hostt->slave_destroy(sdev);
1308         transport_destroy_device(dev);
1309
1310         /*
1311          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1312          * remoed sysfs visibility from the device, so make the target
1313          * invisible if this was the last device underneath it.
1314          */
1315         scsi_target_reap(scsi_target(sdev));
1316
1317         put_device(dev);
1318 }
1319
1320 /**
1321  * scsi_remove_device - unregister a device from the scsi bus
1322  * @sdev:       scsi_device to unregister
1323  **/
1324 void scsi_remove_device(struct scsi_device *sdev)
1325 {
1326         struct Scsi_Host *shost = sdev->host;
1327
1328         mutex_lock(&shost->scan_mutex);
1329         __scsi_remove_device(sdev);
1330         mutex_unlock(&shost->scan_mutex);
1331 }
1332 EXPORT_SYMBOL(scsi_remove_device);
1333
1334 static void __scsi_remove_target(struct scsi_target *starget)
1335 {
1336         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1337         unsigned long flags;
1338         struct scsi_device *sdev;
1339
1340         spin_lock_irqsave(shost->host_lock, flags);
1341  restart:
1342         list_for_each_entry(sdev, &shost->__devices, siblings) {
1343                 if (sdev->channel != starget->channel ||
1344                     sdev->id != starget->id ||
1345                     scsi_device_get(sdev))
1346                         continue;
1347                 spin_unlock_irqrestore(shost->host_lock, flags);
1348                 scsi_remove_device(sdev);
1349                 scsi_device_put(sdev);
1350                 spin_lock_irqsave(shost->host_lock, flags);
1351                 goto restart;
1352         }
1353         spin_unlock_irqrestore(shost->host_lock, flags);
1354 }
1355
1356 /**
1357  * scsi_remove_target - try to remove a target and all its devices
1358  * @dev: generic starget or parent of generic stargets to be removed
1359  *
1360  * Note: This is slightly racy.  It is possible that if the user
1361  * requests the addition of another device then the target won't be
1362  * removed.
1363  */
1364 void scsi_remove_target(struct device *dev)
1365 {
1366         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1367         struct scsi_target *starget, *last_target = NULL;
1368         unsigned long flags;
1369
1370 restart:
1371         spin_lock_irqsave(shost->host_lock, flags);
1372         list_for_each_entry(starget, &shost->__targets, siblings) {
1373                 if (starget->state == STARGET_DEL ||
1374                     starget == last_target)
1375                         continue;
1376                 if (starget->dev.parent == dev || &starget->dev == dev) {
1377                         kref_get(&starget->reap_ref);
1378                         last_target = starget;
1379                         spin_unlock_irqrestore(shost->host_lock, flags);
1380                         __scsi_remove_target(starget);
1381                         scsi_target_reap(starget);
1382                         goto restart;
1383                 }
1384         }
1385         spin_unlock_irqrestore(shost->host_lock, flags);
1386 }
1387 EXPORT_SYMBOL(scsi_remove_target);
1388
1389 int scsi_register_driver(struct device_driver *drv)
1390 {
1391         drv->bus = &scsi_bus_type;
1392
1393         return driver_register(drv);
1394 }
1395 EXPORT_SYMBOL(scsi_register_driver);
1396
1397 int scsi_register_interface(struct class_interface *intf)
1398 {
1399         intf->class = &sdev_class;
1400
1401         return class_interface_register(intf);
1402 }
1403 EXPORT_SYMBOL(scsi_register_interface);
1404
1405 /**
1406  * scsi_sysfs_add_host - add scsi host to subsystem
1407  * @shost:     scsi host struct to add to subsystem
1408  **/
1409 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1410 {
1411         int error, i;
1412
1413         /* add host specific attributes */
1414         if (shost->hostt->shost_attrs) {
1415                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1416                         error = device_create_file(&shost->shost_dev,
1417                                         shost->hostt->shost_attrs[i]);
1418                         if (error)
1419                                 return error;
1420                 }
1421         }
1422
1423         transport_register_device(&shost->shost_gendev);
1424         transport_configure_device(&shost->shost_gendev);
1425         return 0;
1426 }
1427
1428 static struct device_type scsi_dev_type = {
1429         .name =         "scsi_device",
1430         .release =      scsi_device_dev_release,
1431         .groups =       scsi_sdev_attr_groups,
1432 };
1433
1434 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1435 {
1436         unsigned long flags;
1437         struct Scsi_Host *shost = sdev->host;
1438         struct scsi_target  *starget = sdev->sdev_target;
1439
1440         device_initialize(&sdev->sdev_gendev);
1441         sdev->sdev_gendev.bus = &scsi_bus_type;
1442         sdev->sdev_gendev.type = &scsi_dev_type;
1443         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1444                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1445
1446         device_initialize(&sdev->sdev_dev);
1447         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1448         sdev->sdev_dev.class = &sdev_class;
1449         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1450                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1451         /*
1452          * Get a default scsi_level from the target (derived from sibling
1453          * devices).  This is the best we can do for guessing how to set
1454          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1455          * setting doesn't matter, because all the bits are zero anyway.
1456          * But it does matter for higher LUNs.
1457          */
1458         sdev->scsi_level = starget->scsi_level;
1459         if (sdev->scsi_level <= SCSI_2 &&
1460                         sdev->scsi_level != SCSI_UNKNOWN &&
1461                         !shost->no_scsi2_lun_in_cdb)
1462                 sdev->lun_in_cdb = 1;
1463
1464         transport_setup_device(&sdev->sdev_gendev);
1465         spin_lock_irqsave(shost->host_lock, flags);
1466         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1467         list_add_tail(&sdev->siblings, &shost->__devices);
1468         spin_unlock_irqrestore(shost->host_lock, flags);
1469         /*
1470          * device can now only be removed via __scsi_remove_device() so hold
1471          * the target.  Target will be held in CREATED state until something
1472          * beneath it becomes visible (in which case it moves to RUNNING)
1473          */
1474         kref_get(&starget->reap_ref);
1475 }
1476
1477 int scsi_is_sdev_device(const struct device *dev)
1478 {
1479         return dev->type == &scsi_dev_type;
1480 }
1481 EXPORT_SYMBOL(scsi_is_sdev_device);
1482
1483 /* A blank transport template that is used in drivers that don't
1484  * yet implement Transport Attributes */
1485 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };