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