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 #ifdef CONFIG_SCSI_DH
  85 static const struct {
  86         unsigned char   value;
  87         char            *name;
  88 } sdev_access_states[] = {
  89         { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
  90         { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
  91         { SCSI_ACCESS_STATE_STANDBY, "standby" },
  92         { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
  93         { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
  94         { SCSI_ACCESS_STATE_OFFLINE, "offline" },
  95         { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
  96 };
  97
  98 static const char *scsi_access_state_name(unsigned char state)
  99 {
 100         int i;
 101         char *name = NULL;
 102
 103         for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
 104                 if (sdev_access_states[i].value == state) {
 105                         name = sdev_access_states[i].name;
 106                         break;
 107                 }
 108         }
 109         return name;
 110 }
 111 #endif
 112
 113 static int check_set(unsigned long long *val, char *src)
 114 {
 115         char *last;
 116
 117         if (strcmp(src, "-") == 0) {
 118                 *val = SCAN_WILD_CARD;
 119         } else {
 120                 /*
 121                  * Doesn't check for int overflow
 122                  */
 123                 *val = simple_strtoull(src, &last, 0);
 124                 if (*last != '\0')
 125                         return 1;
 126         }
 127         return 0;
 128 }
 129
 130 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 131 {
 132         char s1[15], s2[15], s3[17], junk;
 133         unsigned long long channel, id, lun;
 134         int res;
 135
 136         res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
 137         if (res != 3)
 138                 return -EINVAL;
 139         if (check_set(&channel, s1))
 140                 return -EINVAL;
 141         if (check_set(&id, s2))
 142                 return -EINVAL;
 143         if (check_set(&lun, s3))
 144                 return -EINVAL;
 145         if (shost->transportt->user_scan)
 146                 res = shost->transportt->user_scan(shost, channel, id, lun);
 147         else
 148                 res = scsi_scan_host_selected(shost, channel, id, lun,
 149                                               SCSI_SCAN_MANUAL);
 150         return res;
 151 }
 152
 153 /*
 154  * shost_show_function: macro to create an attr function that can be used to
 155  * show a non-bit field.
 156  */
 157 #define shost_show_function(name, field, format_string)                 \
 158 static ssize_t                                                          \
 159 show_##name (struct device *dev, struct device_attribute *attr,         \
 160              char *buf)                                                 \
 161 {                                                                       \
 162         struct Scsi_Host *shost = class_to_shost(dev);                  \
 163         return snprintf (buf, 20, format_string, shost->field);         \
 164 }
 165
 166 /*
 167  * shost_rd_attr: macro to create a function and attribute variable for a
 168  * read only field.
 169  */
 170 #define shost_rd_attr2(name, field, format_string)                      \
 171         shost_show_function(name, field, format_string)                 \
 172 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 173
 174 #define shost_rd_attr(field, format_string) \
 175 shost_rd_attr2(field, field, format_string)
 176
 177 /*
 178  * Create the actual show/store functions and data structures.
 179  */
 180
 181 static ssize_t
 182 store_scan(struct device *dev, struct device_attribute *attr,
 183            const char *buf, size_t count)
 184 {
 185         struct Scsi_Host *shost = class_to_shost(dev);
 186         int res;
 187
 188         res = scsi_scan(shost, buf);
 189         if (res == 0)
 190                 res = count;
 191         return res;
 192 };
 193 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 194
 195 static ssize_t
 196 store_shost_state(struct device *dev, struct device_attribute *attr,
 197                   const char *buf, size_t count)
 198 {
 199         int i;
 200         struct Scsi_Host *shost = class_to_shost(dev);
 201         enum scsi_host_state state = 0;
 202
 203         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 204                 const int len = strlen(shost_states[i].name);
 205                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 206                    buf[len] == '\n') {
 207                         state = shost_states[i].value;
 208                         break;
 209                 }
 210         }
 211         if (!state)
 212                 return -EINVAL;
 213
 214         if (scsi_host_set_state(shost, state))
 215                 return -EINVAL;
 216         return count;
 217 }
 218
 219 static ssize_t
 220 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 221 {
 222         struct Scsi_Host *shost = class_to_shost(dev);
 223         const char *name = scsi_host_state_name(shost->shost_state);
 224
 225         if (!name)
 226                 return -EINVAL;
 227
 228         return snprintf(buf, 20, "%s\n", name);
 229 }
 230
 231 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 232 static struct device_attribute dev_attr_hstate =
 233         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 234
 235 static ssize_t
 236 show_shost_mode(unsigned int mode, char *buf)
 237 {
 238         ssize_t len = 0;
 239
 240         if (mode & MODE_INITIATOR)
 241                 len = sprintf(buf, "%s", "Initiator");
 242
 243         if (mode & MODE_TARGET)
 244                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 245
 246         len += sprintf(buf + len, "\n");
 247
 248         return len;
 249 }
 250
 251 static ssize_t
 252 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 253                           char *buf)
 254 {
 255         struct Scsi_Host *shost = class_to_shost(dev);
 256         unsigned int supported_mode = shost->hostt->supported_mode;
 257
 258         if (supported_mode == MODE_UNKNOWN)
 259                 /* by default this should be initiator */
 260                 supported_mode = MODE_INITIATOR;
 261
 262         return show_shost_mode(supported_mode, buf);
 263 }
 264
 265 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 266
 267 static ssize_t
 268 show_shost_active_mode(struct device *dev,
 269                        struct device_attribute *attr, char *buf)
 270 {
 271         struct Scsi_Host *shost = class_to_shost(dev);
 272
 273         if (shost->active_mode == MODE_UNKNOWN)
 274                 return snprintf(buf, 20, "unknown\n");
 275         else
 276                 return show_shost_mode(shost->active_mode, buf);
 277 }
 278
 279 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 280
 281 static int check_reset_type(const char *str)
 282 {
 283         if (sysfs_streq(str, "adapter"))
 284                 return SCSI_ADAPTER_RESET;
 285         else if (sysfs_streq(str, "firmware"))
 286                 return SCSI_FIRMWARE_RESET;
 287         else
 288                 return 0;
 289 }
 290
 291 static ssize_t
 292 store_host_reset(struct device *dev, struct device_attribute *attr,
 293                 const char *buf, size_t count)
 294 {
 295         struct Scsi_Host *shost = class_to_shost(dev);
 296         struct scsi_host_template *sht = shost->hostt;
 297         int ret = -EINVAL;
 298         int type;
 299
 300         type = check_reset_type(buf);
 301         if (!type)
 302                 goto exit_store_host_reset;
 303
 304         if (sht->host_reset)
 305                 ret = sht->host_reset(shost, type);
 306         else
 307                 ret = -EOPNOTSUPP;
 308
 309 exit_store_host_reset:
 310         if (ret == 0)
 311                 ret = count;
 312         return ret;
 313 }
 314
 315 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 316
 317 static ssize_t
 318 show_shost_eh_deadline(struct device *dev,
 319                       struct device_attribute *attr, char *buf)
 320 {
 321         struct Scsi_Host *shost = class_to_shost(dev);
 322
 323         if (shost->eh_deadline == -1)
 324                 return snprintf(buf, strlen("off") + 2, "off\n");
 325         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 326 }
 327
 328 static ssize_t
 329 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 330                 const char *buf, size_t count)
 331 {
 332         struct Scsi_Host *shost = class_to_shost(dev);
 333         int ret = -EINVAL;
 334         unsigned long deadline, flags;
 335
 336         if (shost->transportt &&
 337             (shost->transportt->eh_strategy_handler ||
 338              !shost->hostt->eh_host_reset_handler))
 339                 return ret;
 340
 341         if (!strncmp(buf, "off", strlen("off")))
 342                 deadline = -1;
 343         else {
 344                 ret = kstrtoul(buf, 10, &deadline);
 345                 if (ret)
 346                         return ret;
 347                 if (deadline * HZ > UINT_MAX)
 348                         return -EINVAL;
 349         }
 350
 351         spin_lock_irqsave(shost->host_lock, flags);
 352         if (scsi_host_in_recovery(shost))
 353                 ret = -EBUSY;
 354         else {
 355                 if (deadline == -1)
 356                         shost->eh_deadline = -1;
 357                 else
 358                         shost->eh_deadline = deadline * HZ;
 359
 360                 ret = count;
 361         }
 362         spin_unlock_irqrestore(shost->host_lock, flags);
 363
 364         return ret;
 365 }
 366
 367 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 368
 369 shost_rd_attr(use_blk_mq, "%d\n");
 370 shost_rd_attr(unique_id, "%u\n");
 371 shost_rd_attr(cmd_per_lun, "%hd\n");
 372 shost_rd_attr(can_queue, "%hd\n");
 373 shost_rd_attr(sg_tablesize, "%hu\n");
 374 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 375 shost_rd_attr(unchecked_isa_dma, "%d\n");
 376 shost_rd_attr(prot_capabilities, "%u\n");
 377 shost_rd_attr(prot_guard_type, "%hd\n");
 378 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 379
 380 static ssize_t
 381 show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
 382 {
 383         struct Scsi_Host *shost = class_to_shost(dev);
 384         return snprintf(buf, 20, "%d\n", atomic_read(&shost->host_busy));
 385 }
 386 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 387
 388 static struct attribute *scsi_sysfs_shost_attrs[] = {
 389         &dev_attr_use_blk_mq.attr,
 390         &dev_attr_unique_id.attr,
 391         &dev_attr_host_busy.attr,
 392         &dev_attr_cmd_per_lun.attr,
 393         &dev_attr_can_queue.attr,
 394         &dev_attr_sg_tablesize.attr,
 395         &dev_attr_sg_prot_tablesize.attr,
 396         &dev_attr_unchecked_isa_dma.attr,
 397         &dev_attr_proc_name.attr,
 398         &dev_attr_scan.attr,
 399         &dev_attr_hstate.attr,
 400         &dev_attr_supported_mode.attr,
 401         &dev_attr_active_mode.attr,
 402         &dev_attr_prot_capabilities.attr,
 403         &dev_attr_prot_guard_type.attr,
 404         &dev_attr_host_reset.attr,
 405         &dev_attr_eh_deadline.attr,
 406         NULL
 407 };
 408
 409 static struct attribute_group scsi_shost_attr_group = {
 410         .attrs =        scsi_sysfs_shost_attrs,
 411 };
 412
 413 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 414         &scsi_shost_attr_group,
 415         NULL
 416 };
 417
 418 static void scsi_device_cls_release(struct device *class_dev)
 419 {
 420         struct scsi_device *sdev;
 421
 422         sdev = class_to_sdev(class_dev);
 423         put_device(&sdev->sdev_gendev);
 424 }
 425
 426 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 427 {
 428         struct scsi_device *sdev;
 429         struct device *parent;
 430         struct list_head *this, *tmp;
 431         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 432         unsigned long flags;
 433
 434         sdev = container_of(work, struct scsi_device, ew.work);
 435
 436         scsi_dh_release_device(sdev);
 437
 438         parent = sdev->sdev_gendev.parent;
 439
 440         spin_lock_irqsave(sdev->host->host_lock, flags);
 441         list_del(&sdev->siblings);
 442         list_del(&sdev->same_target_siblings);
 443         list_del(&sdev->starved_entry);
 444         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 445
 446         cancel_work_sync(&sdev->event_work);
 447
 448         list_for_each_safe(this, tmp, &sdev->event_list) {
 449                 struct scsi_event *evt;
 450
 451                 evt = list_entry(this, struct scsi_event, node);
 452                 list_del(&evt->node);
 453                 kfree(evt);
 454         }
 455
 456         blk_put_queue(sdev->request_queue);
 457         /* NULL queue means the device can't be used */
 458         sdev->request_queue = NULL;
 459
 460         mutex_lock(&sdev->inquiry_mutex);
 461         rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
 462                            lockdep_is_held(&sdev->inquiry_mutex));
 463         rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
 464                            lockdep_is_held(&sdev->inquiry_mutex));
 465         mutex_unlock(&sdev->inquiry_mutex);
 466
 467         if (vpd_pg83)
 468                 kfree_rcu(vpd_pg83, rcu);
 469         if (vpd_pg80)
 470                 kfree_rcu(vpd_pg80, rcu);
 471         kfree(sdev->inquiry);
 472         kfree(sdev);
 473
 474         if (parent)
 475                 put_device(parent);
 476 }
 477
 478 static void scsi_device_dev_release(struct device *dev)
 479 {
 480         struct scsi_device *sdp = to_scsi_device(dev);
 481         execute_in_process_context(scsi_device_dev_release_usercontext,
 482                                    &sdp->ew);
 483 }
 484
 485 static struct class sdev_class = {
 486         .name           = "scsi_device",
 487         .dev_release    = scsi_device_cls_release,
 488 };
 489
 490 /* all probing is done in the individual ->probe routines */
 491 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 492 {
 493         struct scsi_device *sdp;
 494
 495         if (dev->type != &scsi_dev_type)
 496                 return 0;
 497
 498         sdp = to_scsi_device(dev);
 499         if (sdp->no_uld_attach)
 500                 return 0;
 501         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 502 }
 503
 504 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 505 {
 506         struct scsi_device *sdev;
 507
 508         if (dev->type != &scsi_dev_type)
 509                 return 0;
 510
 511         sdev = to_scsi_device(dev);
 512
 513         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 514         return 0;
 515 }
 516
 517 struct bus_type scsi_bus_type = {
 518         .name           = "scsi",
 519         .match          = scsi_bus_match,
 520         .uevent         = scsi_bus_uevent,
 521 #ifdef CONFIG_PM
 522         .pm             = &scsi_bus_pm_ops,
 523 #endif
 524 };
 525 EXPORT_SYMBOL_GPL(scsi_bus_type);
 526
 527 int scsi_sysfs_register(void)
 528 {
 529         int error;
 530
 531         error = bus_register(&scsi_bus_type);
 532         if (!error) {
 533                 error = class_register(&sdev_class);
 534                 if (error)
 535                         bus_unregister(&scsi_bus_type);
 536         }
 537
 538         return error;
 539 }
 540
 541 void scsi_sysfs_unregister(void)
 542 {
 543         class_unregister(&sdev_class);
 544         bus_unregister(&scsi_bus_type);
 545 }
 546
 547 /*
 548  * sdev_show_function: macro to create an attr function that can be used to
 549  * show a non-bit field.
 550  */
 551 #define sdev_show_function(field, format_string)                                \
 552 static ssize_t                                                          \
 553 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 554                    char *buf)                                           \
 555 {                                                                       \
 556         struct scsi_device *sdev;                                       \
 557         sdev = to_scsi_device(dev);                                     \
 558         return snprintf (buf, 20, format_string, sdev->field);          \
 559 }                                                                       \
 560
 561 /*
 562  * sdev_rd_attr: macro to create a function and attribute variable for a
 563  * read only field.
 564  */
 565 #define sdev_rd_attr(field, format_string)                              \
 566         sdev_show_function(field, format_string)                        \
 567 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 568
 569
 570 /*
 571  * sdev_rw_attr: create a function and attribute variable for a
 572  * read/write field.
 573  */
 574 #define sdev_rw_attr(field, format_string)                              \
 575         sdev_show_function(field, format_string)                                \
 576                                                                         \
 577 static ssize_t                                                          \
 578 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 579                     const char *buf, size_t count)                      \
 580 {                                                                       \
 581         struct scsi_device *sdev;                                       \
 582         sdev = to_scsi_device(dev);                                     \
 583         sscanf (buf, format_string, &sdev->field);                      \
 584         return count;                                                   \
 585 }                                                                       \
 586 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 587
 588 /* Currently we don't export bit fields, but we might in future,
 589  * so leave this code in */
 590 #if 0
 591 /*
 592  * sdev_rd_attr: create a function and attribute variable for a
 593  * read/write bit field.
 594  */
 595 #define sdev_rw_attr_bit(field)                                         \
 596         sdev_show_function(field, "%d\n")                                       \
 597                                                                         \
 598 static ssize_t                                                          \
 599 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 600                     const char *buf, size_t count)                      \
 601 {                                                                       \
 602         int ret;                                                        \
 603         struct scsi_device *sdev;                                       \
 604         ret = scsi_sdev_check_buf_bit(buf);                             \
 605         if (ret >= 0)   {                                               \
 606                 sdev = to_scsi_device(dev);                             \
 607                 sdev->field = ret;                                      \
 608                 ret = count;                                            \
 609         }                                                               \
 610         return ret;                                                     \
 611 }                                                                       \
 612 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 613
 614 /*
 615  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 616  * else return -EINVAL.
 617  */
 618 static int scsi_sdev_check_buf_bit(const char *buf)
 619 {
 620         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 621                 if (buf[0] == '1')
 622                         return 1;
 623                 else if (buf[0] == '0')
 624                         return 0;
 625                 else
 626                         return -EINVAL;
 627         } else
 628                 return -EINVAL;
 629 }
 630 #endif
 631 /*
 632  * Create the actual show/store functions and data structures.
 633  */
 634 sdev_rd_attr (type, "%d\n");
 635 sdev_rd_attr (scsi_level, "%d\n");
 636 sdev_rd_attr (vendor, "%.8s\n");
 637 sdev_rd_attr (model, "%.16s\n");
 638 sdev_rd_attr (rev, "%.4s\n");
 639
 640 static ssize_t
 641 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 642                 char *buf)
 643 {
 644         struct scsi_device *sdev = to_scsi_device(dev);
 645         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
 646 }
 647 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 648
 649 static ssize_t
 650 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 651                 char *buf)
 652 {
 653         struct scsi_device *sdev = to_scsi_device(dev);
 654         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 655 }
 656 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 657
 658 /*
 659  * TODO: can we make these symlinks to the block layer ones?
 660  */
 661 static ssize_t
 662 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 663 {
 664         struct scsi_device *sdev;
 665         sdev = to_scsi_device(dev);
 666         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 667 }
 668
 669 static ssize_t
 670 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 671                     const char *buf, size_t count)
 672 {
 673         struct scsi_device *sdev;
 674         int timeout;
 675         sdev = to_scsi_device(dev);
 676         sscanf (buf, "%d\n", &timeout);
 677         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 678         return count;
 679 }
 680 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 681
 682 static ssize_t
 683 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 684 {
 685         struct scsi_device *sdev;
 686         sdev = to_scsi_device(dev);
 687         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 688 }
 689
 690 static ssize_t
 691 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 692                     const char *buf, size_t count)
 693 {
 694         struct scsi_device *sdev;
 695         unsigned int eh_timeout;
 696         int err;
 697
 698         if (!capable(CAP_SYS_ADMIN))
 699                 return -EACCES;
 700
 701         sdev = to_scsi_device(dev);
 702         err = kstrtouint(buf, 10, &eh_timeout);
 703         if (err)
 704                 return err;
 705         sdev->eh_timeout = eh_timeout * HZ;
 706
 707         return count;
 708 }
 709 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 710
 711 static ssize_t
 712 store_rescan_field (struct device *dev, struct device_attribute *attr,
 713                     const char *buf, size_t count)
 714 {
 715         scsi_rescan_device(dev);
 716         return count;
 717 }
 718 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 719
 720 static ssize_t
 721 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 722                   const char *buf, size_t count)
 723 {
 724         if (device_remove_file_self(dev, attr))
 725                 scsi_remove_device(to_scsi_device(dev));
 726         return count;
 727 };
 728 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 729
 730 static ssize_t
 731 store_state_field(struct device *dev, struct device_attribute *attr,
 732                   const char *buf, size_t count)
 733 {
 734         int i, ret;
 735         struct scsi_device *sdev = to_scsi_device(dev);
 736         enum scsi_device_state state = 0;
 737
 738         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 739                 const int len = strlen(sdev_states[i].name);
 740                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 741                    buf[len] == '\n') {
 742                         state = sdev_states[i].value;
 743                         break;
 744                 }
 745         }
 746         if (!state)
 747                 return -EINVAL;
 748
 749         mutex_lock(&sdev->state_mutex);
 750         ret = scsi_device_set_state(sdev, state);
 751         mutex_unlock(&sdev->state_mutex);
 752
 753         return ret == 0 ? count : -EINVAL;
 754 }
 755
 756 static ssize_t
 757 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 758 {
 759         struct scsi_device *sdev = to_scsi_device(dev);
 760         const char *name = scsi_device_state_name(sdev->sdev_state);
 761
 762         if (!name)
 763                 return -EINVAL;
 764
 765         return snprintf(buf, 20, "%s\n", name);
 766 }
 767
 768 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 769
 770 static ssize_t
 771 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 772                       char *buf)
 773 {
 774         struct scsi_device *sdev = to_scsi_device(dev);
 775         const char *name = "none";
 776
 777         if (sdev->simple_tags)
 778                 name = "simple";
 779
 780         return snprintf(buf, 20, "%s\n", name);
 781 }
 782
 783 static ssize_t
 784 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 785                        const char *buf, size_t count)
 786 {
 787         struct scsi_device *sdev = to_scsi_device(dev);
 788
 789         if (!sdev->tagged_supported)
 790                 return -EINVAL;
 791
 792         sdev_printk(KERN_INFO, sdev,
 793                     "ignoring write to deprecated queue_type attribute");
 794         return count;
 795 }
 796
 797 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 798                    store_queue_type_field);
 799
 800 #define sdev_vpd_pg_attr(_page)                                         \
 801 static ssize_t                                                  \
 802 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 803                  struct bin_attribute *bin_attr,                        \
 804                  char *buf, loff_t off, size_t count)                   \
 805 {                                                                       \
 806         struct device *dev = container_of(kobj, struct device, kobj);   \
 807         struct scsi_device *sdev = to_scsi_device(dev);                 \
 808         struct scsi_vpd *vpd_page;                                      \
 809         int ret = -EINVAL;                                              \
 810                                                                         \
 811         rcu_read_lock();                                                \
 812         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 813         if (vpd_page)                                                   \
 814                 ret = memory_read_from_buffer(buf, count, &off,         \
 815                                 vpd_page->data, vpd_page->len);         \
 816         rcu_read_unlock();                                              \
 817         return ret;                                                     \
 818 }                                                                       \
 819 static struct bin_attribute dev_attr_vpd_##_page = {            \
 820         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 821         .size = 0,                                                      \
 822         .read = show_vpd_##_page,                                       \
 823 };
 824
 825 sdev_vpd_pg_attr(pg83);
 826 sdev_vpd_pg_attr(pg80);
 827
 828 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 829                             struct bin_attribute *bin_attr,
 830                             char *buf, loff_t off, size_t count)
 831 {
 832         struct device *dev = container_of(kobj, struct device, kobj);
 833         struct scsi_device *sdev = to_scsi_device(dev);
 834
 835         if (!sdev->inquiry)
 836                 return -EINVAL;
 837
 838         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 839                                        sdev->inquiry_len);
 840 }
 841
 842 static struct bin_attribute dev_attr_inquiry = {
 843         .attr = {
 844                 .name = "inquiry",
 845                 .mode = S_IRUGO,
 846         },
 847         .size = 0,
 848         .read = show_inquiry,
 849 };
 850
 851 static ssize_t
 852 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 853                         char *buf)
 854 {
 855         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 856 }
 857
 858 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 859
 860 #define show_sdev_iostat(field)                                         \
 861 static ssize_t                                                          \
 862 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 863                     char *buf)                                          \
 864 {                                                                       \
 865         struct scsi_device *sdev = to_scsi_device(dev);                 \
 866         unsigned long long count = atomic_read(&sdev->field);           \
 867         return snprintf(buf, 20, "0x%llx\n", count);                    \
 868 }                                                                       \
 869 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 870
 871 show_sdev_iostat(iorequest_cnt);
 872 show_sdev_iostat(iodone_cnt);
 873 show_sdev_iostat(ioerr_cnt);
 874
 875 static ssize_t
 876 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 877 {
 878         struct scsi_device *sdev;
 879         sdev = to_scsi_device(dev);
 880         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 881 }
 882 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 883
 884 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 885 static ssize_t                                                          \
 886 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 887                      char *buf)                                         \
 888 {                                                                       \
 889         struct scsi_device *sdev = to_scsi_device(dev);                 \
 890         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 891         return snprintf(buf, 20, "%d\n", val);                          \
 892 }
 893
 894 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 895 static ssize_t                                                          \
 896 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 897                       const char *buf, size_t count)                    \
 898 {                                                                       \
 899         struct scsi_device *sdev = to_scsi_device(dev);                 \
 900         int val = simple_strtoul(buf, NULL, 0);                         \
 901         if (val == 0)                                                   \
 902                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 903         else if (val == 1)                                              \
 904                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 905         else                                                            \
 906                 return -EINVAL;                                         \
 907         return count;                                                   \
 908 }
 909
 910 #define DECLARE_EVT(name, Cap_name)                                     \
 911         DECLARE_EVT_SHOW(name, Cap_name)                                \
 912         DECLARE_EVT_STORE(name, Cap_name)                               \
 913         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 914                            sdev_store_evt_##name);
 915 #define REF_EVT(name) &dev_attr_evt_##name.attr
 916
 917 DECLARE_EVT(media_change, MEDIA_CHANGE)
 918 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 919 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 920 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 921 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 922 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 923
 924 static ssize_t
 925 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 926                        const char *buf, size_t count)
 927 {
 928         int depth, retval;
 929         struct scsi_device *sdev = to_scsi_device(dev);
 930         struct scsi_host_template *sht = sdev->host->hostt;
 931
 932         if (!sht->change_queue_depth)
 933                 return -EINVAL;
 934
 935         depth = simple_strtoul(buf, NULL, 0);
 936
 937         if (depth < 1 || depth > sdev->host->can_queue)
 938                 return -EINVAL;
 939
 940         retval = sht->change_queue_depth(sdev, depth);
 941         if (retval < 0)
 942                 return retval;
 943
 944         sdev->max_queue_depth = sdev->queue_depth;
 945
 946         return count;
 947 }
 948 sdev_show_function(queue_depth, "%d\n");
 949
 950 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 951                    sdev_store_queue_depth);
 952
 953 static ssize_t
 954 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
 955                     char *buf)
 956 {
 957         struct scsi_device *sdev = to_scsi_device(dev);
 958         ssize_t count;
 959
 960         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
 961         if (count > 0) {
 962                 buf[count] = '\n';
 963                 count++;
 964         }
 965         return count;
 966 }
 967 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
 968
 969 #ifdef CONFIG_SCSI_DH
 970 static ssize_t
 971 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
 972                    char *buf)
 973 {
 974         struct scsi_device *sdev = to_scsi_device(dev);
 975
 976         if (!sdev->handler)
 977                 return snprintf(buf, 20, "detached\n");
 978
 979         return snprintf(buf, 20, "%s\n", sdev->handler->name);
 980 }
 981
 982 static ssize_t
 983 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
 984                     const char *buf, size_t count)
 985 {
 986         struct scsi_device *sdev = to_scsi_device(dev);
 987         int err = -EINVAL;
 988
 989         if (sdev->sdev_state == SDEV_CANCEL ||
 990             sdev->sdev_state == SDEV_DEL)
 991                 return -ENODEV;
 992
 993         if (!sdev->handler) {
 994                 /*
 995                  * Attach to a device handler
 996                  */
 997                 err = scsi_dh_attach(sdev->request_queue, buf);
 998         } else if (!strncmp(buf, "activate", 8)) {
 999                 /*
1000                  * Activate a device handler
1001                  */
1002                 if (sdev->handler->activate)
1003                         err = sdev->handler->activate(sdev, NULL, NULL);
1004                 else
1005                         err = 0;
1006         } else if (!strncmp(buf, "detach", 6)) {
1007                 /*
1008                  * Detach from a device handler
1009                  */
1010                 sdev_printk(KERN_WARNING, sdev,
1011                             "can't detach handler %s.\n",
1012                             sdev->handler->name);
1013                 err = -EINVAL;
1014         }
1015
1016         return err < 0 ? err : count;
1017 }
1018
1019 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1020                    sdev_store_dh_state);
1021
1022 static ssize_t
1023 sdev_show_access_state(struct device *dev,
1024                        struct device_attribute *attr,
1025                        char *buf)
1026 {
1027         struct scsi_device *sdev = to_scsi_device(dev);
1028         unsigned char access_state;
1029         const char *access_state_name;
1030
1031         if (!sdev->handler)
1032                 return -EINVAL;
1033
1034         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1035         access_state_name = scsi_access_state_name(access_state);
1036
1037         return sprintf(buf, "%s\n",
1038                        access_state_name ? access_state_name : "unknown");
1039 }
1040 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1041
1042 static ssize_t
1043 sdev_show_preferred_path(struct device *dev,
1044                          struct device_attribute *attr,
1045                          char *buf)
1046 {
1047         struct scsi_device *sdev = to_scsi_device(dev);
1048
1049         if (!sdev->handler)
1050                 return -EINVAL;
1051
1052         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1053                 return sprintf(buf, "1\n");
1054         else
1055                 return sprintf(buf, "0\n");
1056 }
1057 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1058 #endif
1059
1060 static ssize_t
1061 sdev_show_queue_ramp_up_period(struct device *dev,
1062                                struct device_attribute *attr,
1063                                char *buf)
1064 {
1065         struct scsi_device *sdev;
1066         sdev = to_scsi_device(dev);
1067         return snprintf(buf, 20, "%u\n",
1068                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1069 }
1070
1071 static ssize_t
1072 sdev_store_queue_ramp_up_period(struct device *dev,
1073                                 struct device_attribute *attr,
1074                                 const char *buf, size_t count)
1075 {
1076         struct scsi_device *sdev = to_scsi_device(dev);
1077         unsigned int period;
1078
1079         if (kstrtouint(buf, 10, &period))
1080                 return -EINVAL;
1081
1082         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1083         return count;
1084 }
1085
1086 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1087                    sdev_show_queue_ramp_up_period,
1088                    sdev_store_queue_ramp_up_period);
1089
1090 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1091                                          struct attribute *attr, int i)
1092 {
1093         struct device *dev = container_of(kobj, struct device, kobj);
1094         struct scsi_device *sdev = to_scsi_device(dev);
1095
1096
1097         if (attr == &dev_attr_queue_depth.attr &&
1098             !sdev->host->hostt->change_queue_depth)
1099                 return S_IRUGO;
1100
1101         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1102             !sdev->host->hostt->change_queue_depth)
1103                 return 0;
1104
1105 #ifdef CONFIG_SCSI_DH
1106         if (attr == &dev_attr_access_state.attr &&
1107             !sdev->handler)
1108                 return 0;
1109         if (attr == &dev_attr_preferred_path.attr &&
1110             !sdev->handler)
1111                 return 0;
1112 #endif
1113         return attr->mode;
1114 }
1115
1116 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1117                                              struct bin_attribute *attr, int i)
1118 {
1119         struct device *dev = container_of(kobj, struct device, kobj);
1120         struct scsi_device *sdev = to_scsi_device(dev);
1121
1122
1123         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1124                 return 0;
1125
1126         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1127                 return 0;
1128
1129         return S_IRUGO;
1130 }
1131
1132 /* Default template for device attributes.  May NOT be modified */
1133 static struct attribute *scsi_sdev_attrs[] = {
1134         &dev_attr_device_blocked.attr,
1135         &dev_attr_type.attr,
1136         &dev_attr_scsi_level.attr,
1137         &dev_attr_device_busy.attr,
1138         &dev_attr_vendor.attr,
1139         &dev_attr_model.attr,
1140         &dev_attr_rev.attr,
1141         &dev_attr_rescan.attr,
1142         &dev_attr_delete.attr,
1143         &dev_attr_state.attr,
1144         &dev_attr_timeout.attr,
1145         &dev_attr_eh_timeout.attr,
1146         &dev_attr_iocounterbits.attr,
1147         &dev_attr_iorequest_cnt.attr,
1148         &dev_attr_iodone_cnt.attr,
1149         &dev_attr_ioerr_cnt.attr,
1150         &dev_attr_modalias.attr,
1151         &dev_attr_queue_depth.attr,
1152         &dev_attr_queue_type.attr,
1153         &dev_attr_wwid.attr,
1154 #ifdef CONFIG_SCSI_DH
1155         &dev_attr_dh_state.attr,
1156         &dev_attr_access_state.attr,
1157         &dev_attr_preferred_path.attr,
1158 #endif
1159         &dev_attr_queue_ramp_up_period.attr,
1160         REF_EVT(media_change),
1161         REF_EVT(inquiry_change_reported),
1162         REF_EVT(capacity_change_reported),
1163         REF_EVT(soft_threshold_reached),
1164         REF_EVT(mode_parameter_change_reported),
1165         REF_EVT(lun_change_reported),
1166         NULL
1167 };
1168
1169 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1170         &dev_attr_vpd_pg83,
1171         &dev_attr_vpd_pg80,
1172         &dev_attr_inquiry,
1173         NULL
1174 };
1175 static struct attribute_group scsi_sdev_attr_group = {
1176         .attrs =        scsi_sdev_attrs,
1177         .bin_attrs =    scsi_sdev_bin_attrs,
1178         .is_visible =   scsi_sdev_attr_is_visible,
1179         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1180 };
1181
1182 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1183         &scsi_sdev_attr_group,
1184         NULL
1185 };
1186
1187 static int scsi_target_add(struct scsi_target *starget)
1188 {
1189         int error;
1190
1191         if (starget->state != STARGET_CREATED)
1192                 return 0;
1193
1194         error = device_add(&starget->dev);
1195         if (error) {
1196                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1197                 return error;
1198         }
1199         transport_add_device(&starget->dev);
1200         starget->state = STARGET_RUNNING;
1201
1202         pm_runtime_set_active(&starget->dev);
1203         pm_runtime_enable(&starget->dev);
1204         device_enable_async_suspend(&starget->dev);
1205
1206         return 0;
1207 }
1208
1209 /**
1210  * scsi_sysfs_add_sdev - add scsi device to sysfs
1211  * @sdev:       scsi_device to add
1212  *
1213  * Return value:
1214  *      0 on Success / non-zero on Failure
1215  **/
1216 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1217 {
1218         int error, i;
1219         struct request_queue *rq = sdev->request_queue;
1220         struct scsi_target *starget = sdev->sdev_target;
1221
1222         error = scsi_target_add(starget);
1223         if (error)
1224                 return error;
1225
1226         transport_configure_device(&starget->dev);
1227
1228         device_enable_async_suspend(&sdev->sdev_gendev);
1229         scsi_autopm_get_target(starget);
1230         pm_runtime_set_active(&sdev->sdev_gendev);
1231         pm_runtime_forbid(&sdev->sdev_gendev);
1232         pm_runtime_enable(&sdev->sdev_gendev);
1233         scsi_autopm_put_target(starget);
1234
1235         scsi_autopm_get_device(sdev);
1236
1237         error = scsi_dh_add_device(sdev);
1238         if (error)
1239                 /*
1240                  * device_handler is optional, so any error can be ignored
1241                  */
1242                 sdev_printk(KERN_INFO, sdev,
1243                                 "failed to add device handler: %d\n", error);
1244
1245         error = device_add(&sdev->sdev_gendev);
1246         if (error) {
1247                 sdev_printk(KERN_INFO, sdev,
1248                                 "failed to add device: %d\n", error);
1249                 scsi_dh_remove_device(sdev);
1250                 return error;
1251         }
1252
1253         device_enable_async_suspend(&sdev->sdev_dev);
1254         error = device_add(&sdev->sdev_dev);
1255         if (error) {
1256                 sdev_printk(KERN_INFO, sdev,
1257                                 "failed to add class device: %d\n", error);
1258                 scsi_dh_remove_device(sdev);
1259                 device_del(&sdev->sdev_gendev);
1260                 return error;
1261         }
1262         transport_add_device(&sdev->sdev_gendev);
1263         sdev->is_visible = 1;
1264
1265         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1266
1267         if (error)
1268                 /* we're treating error on bsg register as non-fatal,
1269                  * so pretend nothing went wrong */
1270                 sdev_printk(KERN_INFO, sdev,
1271                             "Failed to register bsg queue, errno=%d\n", error);
1272
1273         /* add additional host specific attributes */
1274         if (sdev->host->hostt->sdev_attrs) {
1275                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1276                         error = device_create_file(&sdev->sdev_gendev,
1277                                         sdev->host->hostt->sdev_attrs[i]);
1278                         if (error)
1279                                 return error;
1280                 }
1281         }
1282
1283         scsi_autopm_put_device(sdev);
1284         return error;
1285 }
1286
1287 void __scsi_remove_device(struct scsi_device *sdev)
1288 {
1289         struct device *dev = &sdev->sdev_gendev;
1290         int res;
1291
1292         /*
1293          * This cleanup path is not reentrant and while it is impossible
1294          * to get a new reference with scsi_device_get() someone can still
1295          * hold a previously acquired one.
1296          */
1297         if (sdev->sdev_state == SDEV_DEL)
1298                 return;
1299
1300         if (sdev->is_visible) {
1301                 /*
1302                  * If scsi_internal_target_block() is running concurrently,
1303                  * wait until it has finished before changing the device state.
1304                  */
1305                 mutex_lock(&sdev->state_mutex);
1306                 /*
1307                  * If blocked, we go straight to DEL and restart the queue so
1308                  * any commands issued during driver shutdown (like sync
1309                  * cache) are errored immediately.
1310                  */
1311                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1312                 if (res != 0) {
1313                         res = scsi_device_set_state(sdev, SDEV_DEL);
1314                         if (res == 0)
1315                                 scsi_start_queue(sdev);
1316                 }
1317                 mutex_unlock(&sdev->state_mutex);
1318
1319                 if (res != 0)
1320                         return;
1321
1322                 bsg_unregister_queue(sdev->request_queue);
1323                 device_unregister(&sdev->sdev_dev);
1324                 transport_remove_device(dev);
1325                 scsi_dh_remove_device(sdev);
1326                 device_del(dev);
1327         } else
1328                 put_device(&sdev->sdev_dev);
1329
1330         /*
1331          * Stop accepting new requests and wait until all queuecommand() and
1332          * scsi_run_queue() invocations have finished before tearing down the
1333          * device.
1334          */
1335         mutex_lock(&sdev->state_mutex);
1336         scsi_device_set_state(sdev, SDEV_DEL);
1337         mutex_unlock(&sdev->state_mutex);
1338
1339         blk_cleanup_queue(sdev->request_queue);
1340         cancel_work_sync(&sdev->requeue_work);
1341
1342         if (sdev->host->hostt->slave_destroy)
1343                 sdev->host->hostt->slave_destroy(sdev);
1344         transport_destroy_device(dev);
1345
1346         /*
1347          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1348          * remoed sysfs visibility from the device, so make the target
1349          * invisible if this was the last device underneath it.
1350          */
1351         scsi_target_reap(scsi_target(sdev));
1352
1353         put_device(dev);
1354 }
1355
1356 /**
1357  * scsi_remove_device - unregister a device from the scsi bus
1358  * @sdev:       scsi_device to unregister
1359  **/
1360 void scsi_remove_device(struct scsi_device *sdev)
1361 {
1362         struct Scsi_Host *shost = sdev->host;
1363
1364         mutex_lock(&shost->scan_mutex);
1365         __scsi_remove_device(sdev);
1366         mutex_unlock(&shost->scan_mutex);
1367 }
1368 EXPORT_SYMBOL(scsi_remove_device);
1369
1370 static void __scsi_remove_target(struct scsi_target *starget)
1371 {
1372         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1373         unsigned long flags;
1374         struct scsi_device *sdev;
1375
1376         spin_lock_irqsave(shost->host_lock, flags);
1377  restart:
1378         list_for_each_entry(sdev, &shost->__devices, siblings) {
1379                 if (sdev->channel != starget->channel ||
1380                     sdev->id != starget->id ||
1381                     scsi_device_get(sdev))
1382                         continue;
1383                 spin_unlock_irqrestore(shost->host_lock, flags);
1384                 scsi_remove_device(sdev);
1385                 scsi_device_put(sdev);
1386                 spin_lock_irqsave(shost->host_lock, flags);
1387                 goto restart;
1388         }
1389         spin_unlock_irqrestore(shost->host_lock, flags);
1390 }
1391
1392 /**
1393  * scsi_remove_target - try to remove a target and all its devices
1394  * @dev: generic starget or parent of generic stargets to be removed
1395  *
1396  * Note: This is slightly racy.  It is possible that if the user
1397  * requests the addition of another device then the target won't be
1398  * removed.
1399  */
1400 void scsi_remove_target(struct device *dev)
1401 {
1402         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1403         struct scsi_target *starget;
1404         unsigned long flags;
1405
1406 restart:
1407         spin_lock_irqsave(shost->host_lock, flags);
1408         list_for_each_entry(starget, &shost->__targets, siblings) {
1409                 if (starget->state == STARGET_DEL ||
1410                     starget->state == STARGET_REMOVE ||
1411                     starget->state == STARGET_CREATED_REMOVE)
1412                         continue;
1413                 if (starget->dev.parent == dev || &starget->dev == dev) {
1414                         kref_get(&starget->reap_ref);
1415                         if (starget->state == STARGET_CREATED)
1416                                 starget->state = STARGET_CREATED_REMOVE;
1417                         else
1418                                 starget->state = STARGET_REMOVE;
1419                         spin_unlock_irqrestore(shost->host_lock, flags);
1420                         __scsi_remove_target(starget);
1421                         scsi_target_reap(starget);
1422                         goto restart;
1423                 }
1424         }
1425         spin_unlock_irqrestore(shost->host_lock, flags);
1426 }
1427 EXPORT_SYMBOL(scsi_remove_target);
1428
1429 int scsi_register_driver(struct device_driver *drv)
1430 {
1431         drv->bus = &scsi_bus_type;
1432
1433         return driver_register(drv);
1434 }
1435 EXPORT_SYMBOL(scsi_register_driver);
1436
1437 int scsi_register_interface(struct class_interface *intf)
1438 {
1439         intf->class = &sdev_class;
1440
1441         return class_interface_register(intf);
1442 }
1443 EXPORT_SYMBOL(scsi_register_interface);
1444
1445 /**
1446  * scsi_sysfs_add_host - add scsi host to subsystem
1447  * @shost:     scsi host struct to add to subsystem
1448  **/
1449 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1450 {
1451         int error, i;
1452
1453         /* add host specific attributes */
1454         if (shost->hostt->shost_attrs) {
1455                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1456                         error = device_create_file(&shost->shost_dev,
1457                                         shost->hostt->shost_attrs[i]);
1458                         if (error)
1459                                 return error;
1460                 }
1461         }
1462
1463         transport_register_device(&shost->shost_gendev);
1464         transport_configure_device(&shost->shost_gendev);
1465         return 0;
1466 }
1467
1468 static struct device_type scsi_dev_type = {
1469         .name =         "scsi_device",
1470         .release =      scsi_device_dev_release,
1471         .groups =       scsi_sdev_attr_groups,
1472 };
1473
1474 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1475 {
1476         unsigned long flags;
1477         struct Scsi_Host *shost = sdev->host;
1478         struct scsi_target  *starget = sdev->sdev_target;
1479
1480         device_initialize(&sdev->sdev_gendev);
1481         sdev->sdev_gendev.bus = &scsi_bus_type;
1482         sdev->sdev_gendev.type = &scsi_dev_type;
1483         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1484                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1485
1486         device_initialize(&sdev->sdev_dev);
1487         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1488         sdev->sdev_dev.class = &sdev_class;
1489         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1490                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1491         /*
1492          * Get a default scsi_level from the target (derived from sibling
1493          * devices).  This is the best we can do for guessing how to set
1494          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1495          * setting doesn't matter, because all the bits are zero anyway.
1496          * But it does matter for higher LUNs.
1497          */
1498         sdev->scsi_level = starget->scsi_level;
1499         if (sdev->scsi_level <= SCSI_2 &&
1500                         sdev->scsi_level != SCSI_UNKNOWN &&
1501                         !shost->no_scsi2_lun_in_cdb)
1502                 sdev->lun_in_cdb = 1;
1503
1504         transport_setup_device(&sdev->sdev_gendev);
1505         spin_lock_irqsave(shost->host_lock, flags);
1506         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1507         list_add_tail(&sdev->siblings, &shost->__devices);
1508         spin_unlock_irqrestore(shost->host_lock, flags);
1509         /*
1510          * device can now only be removed via __scsi_remove_device() so hold
1511          * the target.  Target will be held in CREATED state until something
1512          * beneath it becomes visible (in which case it moves to RUNNING)
1513          */
1514         kref_get(&starget->reap_ref);
1515 }
1516
1517 int scsi_is_sdev_device(const struct device *dev)
1518 {
1519         return dev->type == &scsi_dev_type;
1520 }
1521 EXPORT_SYMBOL(scsi_is_sdev_device);
1522
1523 /* A blank transport template that is used in drivers that don't
1524  * yet implement Transport Attributes */
1525 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };