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         struct module *mod;
 431
 432         sdev = container_of(work, struct scsi_device, ew.work);
 433
 434         mod = sdev->host->hostt->module;
 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         kfree(sdev->vpd_pg83);
 461         kfree(sdev->vpd_pg80);
 462         kfree(sdev->inquiry);
 463         kfree(sdev);
 464
 465         if (parent)
 466                 put_device(parent);
 467         module_put(mod);
 468 }
 469
 470 static void scsi_device_dev_release(struct device *dev)
 471 {
 472         struct scsi_device *sdp = to_scsi_device(dev);
 473
 474         /* Set module pointer as NULL in case of module unloading */
 475         if (!try_module_get(sdp->host->hostt->module))
 476                 sdp->host->hostt->module = NULL;
 477
 478         execute_in_process_context(scsi_device_dev_release_usercontext,
 479                                    &sdp->ew);
 480 }
 481
 482 static struct class sdev_class = {
 483         .name           = "scsi_device",
 484         .dev_release    = scsi_device_cls_release,
 485 };
 486
 487 /* all probing is done in the individual ->probe routines */
 488 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 489 {
 490         struct scsi_device *sdp;
 491
 492         if (dev->type != &scsi_dev_type)
 493                 return 0;
 494
 495         sdp = to_scsi_device(dev);
 496         if (sdp->no_uld_attach)
 497                 return 0;
 498         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 499 }
 500
 501 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 502 {
 503         struct scsi_device *sdev;
 504
 505         if (dev->type != &scsi_dev_type)
 506                 return 0;
 507
 508         sdev = to_scsi_device(dev);
 509
 510         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 511         return 0;
 512 }
 513
 514 struct bus_type scsi_bus_type = {
 515         .name           = "scsi",
 516         .match          = scsi_bus_match,
 517         .uevent         = scsi_bus_uevent,
 518 #ifdef CONFIG_PM
 519         .pm             = &scsi_bus_pm_ops,
 520 #endif
 521 };
 522 EXPORT_SYMBOL_GPL(scsi_bus_type);
 523
 524 int scsi_sysfs_register(void)
 525 {
 526         int error;
 527
 528         error = bus_register(&scsi_bus_type);
 529         if (!error) {
 530                 error = class_register(&sdev_class);
 531                 if (error)
 532                         bus_unregister(&scsi_bus_type);
 533         }
 534
 535         return error;
 536 }
 537
 538 void scsi_sysfs_unregister(void)
 539 {
 540         class_unregister(&sdev_class);
 541         bus_unregister(&scsi_bus_type);
 542 }
 543
 544 /*
 545  * sdev_show_function: macro to create an attr function that can be used to
 546  * show a non-bit field.
 547  */
 548 #define sdev_show_function(field, format_string)                                \
 549 static ssize_t                                                          \
 550 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 551                    char *buf)                                           \
 552 {                                                                       \
 553         struct scsi_device *sdev;                                       \
 554         sdev = to_scsi_device(dev);                                     \
 555         return snprintf (buf, 20, format_string, sdev->field);          \
 556 }                                                                       \
 557
 558 /*
 559  * sdev_rd_attr: macro to create a function and attribute variable for a
 560  * read only field.
 561  */
 562 #define sdev_rd_attr(field, format_string)                              \
 563         sdev_show_function(field, format_string)                        \
 564 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 565
 566
 567 /*
 568  * sdev_rw_attr: create a function and attribute variable for a
 569  * read/write field.
 570  */
 571 #define sdev_rw_attr(field, format_string)                              \
 572         sdev_show_function(field, format_string)                                \
 573                                                                         \
 574 static ssize_t                                                          \
 575 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 576                     const char *buf, size_t count)                      \
 577 {                                                                       \
 578         struct scsi_device *sdev;                                       \
 579         sdev = to_scsi_device(dev);                                     \
 580         sscanf (buf, format_string, &sdev->field);                      \
 581         return count;                                                   \
 582 }                                                                       \
 583 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 584
 585 /* Currently we don't export bit fields, but we might in future,
 586  * so leave this code in */
 587 #if 0
 588 /*
 589  * sdev_rd_attr: create a function and attribute variable for a
 590  * read/write bit field.
 591  */
 592 #define sdev_rw_attr_bit(field)                                         \
 593         sdev_show_function(field, "%d\n")                                       \
 594                                                                         \
 595 static ssize_t                                                          \
 596 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 597                     const char *buf, size_t count)                      \
 598 {                                                                       \
 599         int ret;                                                        \
 600         struct scsi_device *sdev;                                       \
 601         ret = scsi_sdev_check_buf_bit(buf);                             \
 602         if (ret >= 0)   {                                               \
 603                 sdev = to_scsi_device(dev);                             \
 604                 sdev->field = ret;                                      \
 605                 ret = count;                                            \
 606         }                                                               \
 607         return ret;                                                     \
 608 }                                                                       \
 609 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 610
 611 /*
 612  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 613  * else return -EINVAL.
 614  */
 615 static int scsi_sdev_check_buf_bit(const char *buf)
 616 {
 617         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 618                 if (buf[0] == '1')
 619                         return 1;
 620                 else if (buf[0] == '0')
 621                         return 0;
 622                 else
 623                         return -EINVAL;
 624         } else
 625                 return -EINVAL;
 626 }
 627 #endif
 628 /*
 629  * Create the actual show/store functions and data structures.
 630  */
 631 sdev_rd_attr (type, "%d\n");
 632 sdev_rd_attr (scsi_level, "%d\n");
 633 sdev_rd_attr (vendor, "%.8s\n");
 634 sdev_rd_attr (model, "%.16s\n");
 635 sdev_rd_attr (rev, "%.4s\n");
 636
 637 static ssize_t
 638 sdev_show_device_busy(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_busy));
 643 }
 644 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 645
 646 static ssize_t
 647 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 648                 char *buf)
 649 {
 650         struct scsi_device *sdev = to_scsi_device(dev);
 651         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 652 }
 653 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 654
 655 /*
 656  * TODO: can we make these symlinks to the block layer ones?
 657  */
 658 static ssize_t
 659 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 660 {
 661         struct scsi_device *sdev;
 662         sdev = to_scsi_device(dev);
 663         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 664 }
 665
 666 static ssize_t
 667 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 668                     const char *buf, size_t count)
 669 {
 670         struct scsi_device *sdev;
 671         int timeout;
 672         sdev = to_scsi_device(dev);
 673         sscanf (buf, "%d\n", &timeout);
 674         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 675         return count;
 676 }
 677 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 678
 679 static ssize_t
 680 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 681 {
 682         struct scsi_device *sdev;
 683         sdev = to_scsi_device(dev);
 684         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 685 }
 686
 687 static ssize_t
 688 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 689                     const char *buf, size_t count)
 690 {
 691         struct scsi_device *sdev;
 692         unsigned int eh_timeout;
 693         int err;
 694
 695         if (!capable(CAP_SYS_ADMIN))
 696                 return -EACCES;
 697
 698         sdev = to_scsi_device(dev);
 699         err = kstrtouint(buf, 10, &eh_timeout);
 700         if (err)
 701                 return err;
 702         sdev->eh_timeout = eh_timeout * HZ;
 703
 704         return count;
 705 }
 706 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 707
 708 static ssize_t
 709 store_rescan_field (struct device *dev, struct device_attribute *attr,
 710                     const char *buf, size_t count)
 711 {
 712         scsi_rescan_device(dev);
 713         return count;
 714 }
 715 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 716
 717 static ssize_t
 718 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 719                   const char *buf, size_t count)
 720 {
 721         struct kernfs_node *kn;
 722         struct scsi_device *sdev = to_scsi_device(dev);
 723
 724         /*
 725          * We need to try to get module, avoiding the module been removed
 726          * during delete.
 727          */
 728         if (scsi_device_get(sdev))
 729                 return -ENODEV;
 730
 731         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 732         WARN_ON_ONCE(!kn);
 733         /*
 734          * Concurrent writes into the "delete" sysfs attribute may trigger
 735          * concurrent calls to device_remove_file() and scsi_remove_device().
 736          * device_remove_file() handles concurrent removal calls by
 737          * serializing these and by ignoring the second and later removal
 738          * attempts.  Concurrent calls of scsi_remove_device() are
 739          * serialized. The second and later calls of scsi_remove_device() are
 740          * ignored because the first call of that function changes the device
 741          * state into SDEV_DEL.
 742          */
 743         device_remove_file(dev, attr);
 744         scsi_remove_device(sdev);
 745         if (kn)
 746                 sysfs_unbreak_active_protection(kn);
 747         scsi_device_put(sdev);
 748         return count;
 749 };
 750 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 751
 752 static ssize_t
 753 store_state_field(struct device *dev, struct device_attribute *attr,
 754                   const char *buf, size_t count)
 755 {
 756         int i;
 757         struct scsi_device *sdev = to_scsi_device(dev);
 758         enum scsi_device_state state = 0;
 759
 760         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 761                 const int len = strlen(sdev_states[i].name);
 762                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 763                    buf[len] == '\n') {
 764                         state = sdev_states[i].value;
 765                         break;
 766                 }
 767         }
 768         if (!state)
 769                 return -EINVAL;
 770
 771         if (scsi_device_set_state(sdev, state))
 772                 return -EINVAL;
 773         return count;
 774 }
 775
 776 static ssize_t
 777 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 778 {
 779         struct scsi_device *sdev = to_scsi_device(dev);
 780         const char *name = scsi_device_state_name(sdev->sdev_state);
 781
 782         if (!name)
 783                 return -EINVAL;
 784
 785         return snprintf(buf, 20, "%s\n", name);
 786 }
 787
 788 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 789
 790 static ssize_t
 791 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 792                       char *buf)
 793 {
 794         struct scsi_device *sdev = to_scsi_device(dev);
 795         const char *name = "none";
 796
 797         if (sdev->simple_tags)
 798                 name = "simple";
 799
 800         return snprintf(buf, 20, "%s\n", name);
 801 }
 802
 803 static ssize_t
 804 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 805                        const char *buf, size_t count)
 806 {
 807         struct scsi_device *sdev = to_scsi_device(dev);
 808
 809         if (!sdev->tagged_supported)
 810                 return -EINVAL;
 811
 812         sdev_printk(KERN_INFO, sdev,
 813                     "ignoring write to deprecated queue_type attribute");
 814         return count;
 815 }
 816
 817 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 818                    store_queue_type_field);
 819
 820 #define sdev_vpd_pg_attr(_page)                                         \
 821 static ssize_t                                                  \
 822 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 823                  struct bin_attribute *bin_attr,                        \
 824                  char *buf, loff_t off, size_t count)                   \
 825 {                                                                       \
 826         struct device *dev = container_of(kobj, struct device, kobj);   \
 827         struct scsi_device *sdev = to_scsi_device(dev);                 \
 828         int ret;                                                        \
 829         if (!sdev->vpd_##_page)                                         \
 830                 return -EINVAL;                                         \
 831         rcu_read_lock();                                                \
 832         ret = memory_read_from_buffer(buf, count, &off,                 \
 833                                       rcu_dereference(sdev->vpd_##_page), \
 834                                        sdev->vpd_##_page##_len);        \
 835         rcu_read_unlock();                                              \
 836         return ret;                                             \
 837 }                                                                       \
 838 static struct bin_attribute dev_attr_vpd_##_page = {            \
 839         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 840         .size = 0,                                                      \
 841         .read = show_vpd_##_page,                                       \
 842 };
 843
 844 sdev_vpd_pg_attr(pg83);
 845 sdev_vpd_pg_attr(pg80);
 846
 847 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 848                             struct bin_attribute *bin_attr,
 849                             char *buf, loff_t off, size_t count)
 850 {
 851         struct device *dev = container_of(kobj, struct device, kobj);
 852         struct scsi_device *sdev = to_scsi_device(dev);
 853
 854         if (!sdev->inquiry)
 855                 return -EINVAL;
 856
 857         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 858                                        sdev->inquiry_len);
 859 }
 860
 861 static struct bin_attribute dev_attr_inquiry = {
 862         .attr = {
 863                 .name = "inquiry",
 864                 .mode = S_IRUGO,
 865         },
 866         .size = 0,
 867         .read = show_inquiry,
 868 };
 869
 870 static ssize_t
 871 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 872                         char *buf)
 873 {
 874         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 875 }
 876
 877 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 878
 879 #define show_sdev_iostat(field)                                         \
 880 static ssize_t                                                          \
 881 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 882                     char *buf)                                          \
 883 {                                                                       \
 884         struct scsi_device *sdev = to_scsi_device(dev);                 \
 885         unsigned long long count = atomic_read(&sdev->field);           \
 886         return snprintf(buf, 20, "0x%llx\n", count);                    \
 887 }                                                                       \
 888 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 889
 890 show_sdev_iostat(iorequest_cnt);
 891 show_sdev_iostat(iodone_cnt);
 892 show_sdev_iostat(ioerr_cnt);
 893
 894 static ssize_t
 895 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 896 {
 897         struct scsi_device *sdev;
 898         sdev = to_scsi_device(dev);
 899         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 900 }
 901 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 902
 903 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 904 static ssize_t                                                          \
 905 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 906                      char *buf)                                         \
 907 {                                                                       \
 908         struct scsi_device *sdev = to_scsi_device(dev);                 \
 909         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 910         return snprintf(buf, 20, "%d\n", val);                          \
 911 }
 912
 913 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 914 static ssize_t                                                          \
 915 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 916                       const char *buf, size_t count)                    \
 917 {                                                                       \
 918         struct scsi_device *sdev = to_scsi_device(dev);                 \
 919         int val = simple_strtoul(buf, NULL, 0);                         \
 920         if (val == 0)                                                   \
 921                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 922         else if (val == 1)                                              \
 923                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 924         else                                                            \
 925                 return -EINVAL;                                         \
 926         return count;                                                   \
 927 }
 928
 929 #define DECLARE_EVT(name, Cap_name)                                     \
 930         DECLARE_EVT_SHOW(name, Cap_name)                                \
 931         DECLARE_EVT_STORE(name, Cap_name)                               \
 932         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 933                            sdev_store_evt_##name);
 934 #define REF_EVT(name) &dev_attr_evt_##name.attr
 935
 936 DECLARE_EVT(media_change, MEDIA_CHANGE)
 937 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 938 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 939 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 940 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 941 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 942
 943 static ssize_t
 944 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 945                        const char *buf, size_t count)
 946 {
 947         int depth, retval;
 948         struct scsi_device *sdev = to_scsi_device(dev);
 949         struct scsi_host_template *sht = sdev->host->hostt;
 950
 951         if (!sht->change_queue_depth)
 952                 return -EINVAL;
 953
 954         depth = simple_strtoul(buf, NULL, 0);
 955
 956         if (depth < 1 || depth > sdev->host->can_queue)
 957                 return -EINVAL;
 958
 959         retval = sht->change_queue_depth(sdev, depth);
 960         if (retval < 0)
 961                 return retval;
 962
 963         sdev->max_queue_depth = sdev->queue_depth;
 964
 965         return count;
 966 }
 967 sdev_show_function(queue_depth, "%d\n");
 968
 969 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 970                    sdev_store_queue_depth);
 971
 972 static ssize_t
 973 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
 974                     char *buf)
 975 {
 976         struct scsi_device *sdev = to_scsi_device(dev);
 977         ssize_t count;
 978
 979         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
 980         if (count > 0) {
 981                 buf[count] = '\n';
 982                 count++;
 983         }
 984         return count;
 985 }
 986 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
 987
 988 #ifdef CONFIG_SCSI_DH
 989 static ssize_t
 990 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
 991                    char *buf)
 992 {
 993         struct scsi_device *sdev = to_scsi_device(dev);
 994
 995         if (!sdev->handler)
 996                 return snprintf(buf, 20, "detached\n");
 997
 998         return snprintf(buf, 20, "%s\n", sdev->handler->name);
 999 }
1000
1001 static ssize_t
1002 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1003                     const char *buf, size_t count)
1004 {
1005         struct scsi_device *sdev = to_scsi_device(dev);
1006         int err = -EINVAL;
1007
1008         if (sdev->sdev_state == SDEV_CANCEL ||
1009             sdev->sdev_state == SDEV_DEL)
1010                 return -ENODEV;
1011
1012         if (!sdev->handler) {
1013                 /*
1014                  * Attach to a device handler
1015                  */
1016                 err = scsi_dh_attach(sdev->request_queue, buf);
1017         } else if (!strncmp(buf, "activate", 8)) {
1018                 /*
1019                  * Activate a device handler
1020                  */
1021                 if (sdev->handler->activate)
1022                         err = sdev->handler->activate(sdev, NULL, NULL);
1023                 else
1024                         err = 0;
1025         } else if (!strncmp(buf, "detach", 6)) {
1026                 /*
1027                  * Detach from a device handler
1028                  */
1029                 sdev_printk(KERN_WARNING, sdev,
1030                             "can't detach handler %s.\n",
1031                             sdev->handler->name);
1032                 err = -EINVAL;
1033         }
1034
1035         return err < 0 ? err : count;
1036 }
1037
1038 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1039                    sdev_store_dh_state);
1040
1041 static ssize_t
1042 sdev_show_access_state(struct device *dev,
1043                        struct device_attribute *attr,
1044                        char *buf)
1045 {
1046         struct scsi_device *sdev = to_scsi_device(dev);
1047         unsigned char access_state;
1048         const char *access_state_name;
1049
1050         if (!sdev->handler)
1051                 return -EINVAL;
1052
1053         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1054         access_state_name = scsi_access_state_name(access_state);
1055
1056         return sprintf(buf, "%s\n",
1057                        access_state_name ? access_state_name : "unknown");
1058 }
1059 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1060
1061 static ssize_t
1062 sdev_show_preferred_path(struct device *dev,
1063                          struct device_attribute *attr,
1064                          char *buf)
1065 {
1066         struct scsi_device *sdev = to_scsi_device(dev);
1067
1068         if (!sdev->handler)
1069                 return -EINVAL;
1070
1071         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1072                 return sprintf(buf, "1\n");
1073         else
1074                 return sprintf(buf, "0\n");
1075 }
1076 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1077 #endif
1078
1079 static ssize_t
1080 sdev_show_queue_ramp_up_period(struct device *dev,
1081                                struct device_attribute *attr,
1082                                char *buf)
1083 {
1084         struct scsi_device *sdev;
1085         sdev = to_scsi_device(dev);
1086         return snprintf(buf, 20, "%u\n",
1087                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1088 }
1089
1090 static ssize_t
1091 sdev_store_queue_ramp_up_period(struct device *dev,
1092                                 struct device_attribute *attr,
1093                                 const char *buf, size_t count)
1094 {
1095         struct scsi_device *sdev = to_scsi_device(dev);
1096         unsigned int period;
1097
1098         if (kstrtouint(buf, 10, &period))
1099                 return -EINVAL;
1100
1101         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1102         return count;
1103 }
1104
1105 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1106                    sdev_show_queue_ramp_up_period,
1107                    sdev_store_queue_ramp_up_period);
1108
1109 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1110                                          struct attribute *attr, int i)
1111 {
1112         struct device *dev = container_of(kobj, struct device, kobj);
1113         struct scsi_device *sdev = to_scsi_device(dev);
1114
1115
1116         if (attr == &dev_attr_queue_depth.attr &&
1117             !sdev->host->hostt->change_queue_depth)
1118                 return S_IRUGO;
1119
1120         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1121             !sdev->host->hostt->change_queue_depth)
1122                 return 0;
1123
1124 #ifdef CONFIG_SCSI_DH
1125         if (attr == &dev_attr_access_state.attr &&
1126             !sdev->handler)
1127                 return 0;
1128         if (attr == &dev_attr_preferred_path.attr &&
1129             !sdev->handler)
1130                 return 0;
1131 #endif
1132         return attr->mode;
1133 }
1134
1135 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1136                                              struct bin_attribute *attr, int i)
1137 {
1138         struct device *dev = container_of(kobj, struct device, kobj);
1139         struct scsi_device *sdev = to_scsi_device(dev);
1140
1141
1142         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1143                 return 0;
1144
1145         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1146                 return 0;
1147
1148         return S_IRUGO;
1149 }
1150
1151 /* Default template for device attributes.  May NOT be modified */
1152 static struct attribute *scsi_sdev_attrs[] = {
1153         &dev_attr_device_blocked.attr,
1154         &dev_attr_type.attr,
1155         &dev_attr_scsi_level.attr,
1156         &dev_attr_device_busy.attr,
1157         &dev_attr_vendor.attr,
1158         &dev_attr_model.attr,
1159         &dev_attr_rev.attr,
1160         &dev_attr_rescan.attr,
1161         &dev_attr_delete.attr,
1162         &dev_attr_state.attr,
1163         &dev_attr_timeout.attr,
1164         &dev_attr_eh_timeout.attr,
1165         &dev_attr_iocounterbits.attr,
1166         &dev_attr_iorequest_cnt.attr,
1167         &dev_attr_iodone_cnt.attr,
1168         &dev_attr_ioerr_cnt.attr,
1169         &dev_attr_modalias.attr,
1170         &dev_attr_queue_depth.attr,
1171         &dev_attr_queue_type.attr,
1172         &dev_attr_wwid.attr,
1173 #ifdef CONFIG_SCSI_DH
1174         &dev_attr_dh_state.attr,
1175         &dev_attr_access_state.attr,
1176         &dev_attr_preferred_path.attr,
1177 #endif
1178         &dev_attr_queue_ramp_up_period.attr,
1179         REF_EVT(media_change),
1180         REF_EVT(inquiry_change_reported),
1181         REF_EVT(capacity_change_reported),
1182         REF_EVT(soft_threshold_reached),
1183         REF_EVT(mode_parameter_change_reported),
1184         REF_EVT(lun_change_reported),
1185         NULL
1186 };
1187
1188 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1189         &dev_attr_vpd_pg83,
1190         &dev_attr_vpd_pg80,
1191         &dev_attr_inquiry,
1192         NULL
1193 };
1194 static struct attribute_group scsi_sdev_attr_group = {
1195         .attrs =        scsi_sdev_attrs,
1196         .bin_attrs =    scsi_sdev_bin_attrs,
1197         .is_visible =   scsi_sdev_attr_is_visible,
1198         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1199 };
1200
1201 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1202         &scsi_sdev_attr_group,
1203         NULL
1204 };
1205
1206 static int scsi_target_add(struct scsi_target *starget)
1207 {
1208         int error;
1209
1210         if (starget->state != STARGET_CREATED)
1211                 return 0;
1212
1213         error = device_add(&starget->dev);
1214         if (error) {
1215                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1216                 return error;
1217         }
1218         transport_add_device(&starget->dev);
1219         starget->state = STARGET_RUNNING;
1220
1221         pm_runtime_set_active(&starget->dev);
1222         pm_runtime_enable(&starget->dev);
1223         device_enable_async_suspend(&starget->dev);
1224
1225         return 0;
1226 }
1227
1228 /**
1229  * scsi_sysfs_add_sdev - add scsi device to sysfs
1230  * @sdev:       scsi_device to add
1231  *
1232  * Return value:
1233  *      0 on Success / non-zero on Failure
1234  **/
1235 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1236 {
1237         int error, i;
1238         struct request_queue *rq = sdev->request_queue;
1239         struct scsi_target *starget = sdev->sdev_target;
1240
1241         error = scsi_target_add(starget);
1242         if (error)
1243                 return error;
1244
1245         transport_configure_device(&starget->dev);
1246
1247         device_enable_async_suspend(&sdev->sdev_gendev);
1248         scsi_autopm_get_target(starget);
1249         pm_runtime_set_active(&sdev->sdev_gendev);
1250         pm_runtime_forbid(&sdev->sdev_gendev);
1251         pm_runtime_enable(&sdev->sdev_gendev);
1252         scsi_autopm_put_target(starget);
1253
1254         scsi_autopm_get_device(sdev);
1255
1256         error = scsi_dh_add_device(sdev);
1257         if (error)
1258                 /*
1259                  * device_handler is optional, so any error can be ignored
1260                  */
1261                 sdev_printk(KERN_INFO, sdev,
1262                                 "failed to add device handler: %d\n", error);
1263
1264         error = device_add(&sdev->sdev_gendev);
1265         if (error) {
1266                 sdev_printk(KERN_INFO, sdev,
1267                                 "failed to add device: %d\n", error);
1268                 scsi_dh_remove_device(sdev);
1269                 return error;
1270         }
1271
1272         device_enable_async_suspend(&sdev->sdev_dev);
1273         error = device_add(&sdev->sdev_dev);
1274         if (error) {
1275                 sdev_printk(KERN_INFO, sdev,
1276                                 "failed to add class device: %d\n", error);
1277                 scsi_dh_remove_device(sdev);
1278                 device_del(&sdev->sdev_gendev);
1279                 return error;
1280         }
1281         transport_add_device(&sdev->sdev_gendev);
1282         sdev->is_visible = 1;
1283
1284         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1285
1286         if (error)
1287                 /* we're treating error on bsg register as non-fatal,
1288                  * so pretend nothing went wrong */
1289                 sdev_printk(KERN_INFO, sdev,
1290                             "Failed to register bsg queue, errno=%d\n", error);
1291
1292         /* add additional host specific attributes */
1293         if (sdev->host->hostt->sdev_attrs) {
1294                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1295                         error = device_create_file(&sdev->sdev_gendev,
1296                                         sdev->host->hostt->sdev_attrs[i]);
1297                         if (error)
1298                                 return error;
1299                 }
1300         }
1301
1302         scsi_autopm_put_device(sdev);
1303         return error;
1304 }
1305
1306 void __scsi_remove_device(struct scsi_device *sdev)
1307 {
1308         struct device *dev = &sdev->sdev_gendev;
1309
1310         /*
1311          * This cleanup path is not reentrant and while it is impossible
1312          * to get a new reference with scsi_device_get() someone can still
1313          * hold a previously acquired one.
1314          */
1315         if (sdev->sdev_state == SDEV_DEL)
1316                 return;
1317
1318         if (sdev->is_visible) {
1319                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 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         scsi_device_set_state(sdev, SDEV_DEL);
1336         blk_cleanup_queue(sdev->request_queue);
1337         cancel_work_sync(&sdev->requeue_work);
1338
1339         if (sdev->host->hostt->slave_destroy)
1340                 sdev->host->hostt->slave_destroy(sdev);
1341         transport_destroy_device(dev);
1342
1343         /*
1344          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1345          * remoed sysfs visibility from the device, so make the target
1346          * invisible if this was the last device underneath it.
1347          */
1348         scsi_target_reap(scsi_target(sdev));
1349
1350         put_device(dev);
1351 }
1352
1353 /**
1354  * scsi_remove_device - unregister a device from the scsi bus
1355  * @sdev:       scsi_device to unregister
1356  **/
1357 void scsi_remove_device(struct scsi_device *sdev)
1358 {
1359         struct Scsi_Host *shost = sdev->host;
1360
1361         mutex_lock(&shost->scan_mutex);
1362         __scsi_remove_device(sdev);
1363         mutex_unlock(&shost->scan_mutex);
1364 }
1365 EXPORT_SYMBOL(scsi_remove_device);
1366
1367 static void __scsi_remove_target(struct scsi_target *starget)
1368 {
1369         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1370         unsigned long flags;
1371         struct scsi_device *sdev;
1372
1373         spin_lock_irqsave(shost->host_lock, flags);
1374  restart:
1375         list_for_each_entry(sdev, &shost->__devices, siblings) {
1376                 if (sdev->channel != starget->channel ||
1377                     sdev->id != starget->id ||
1378                     scsi_device_get(sdev))
1379                         continue;
1380                 spin_unlock_irqrestore(shost->host_lock, flags);
1381                 scsi_remove_device(sdev);
1382                 scsi_device_put(sdev);
1383                 spin_lock_irqsave(shost->host_lock, flags);
1384                 goto restart;
1385         }
1386         spin_unlock_irqrestore(shost->host_lock, flags);
1387 }
1388
1389 /**
1390  * scsi_remove_target - try to remove a target and all its devices
1391  * @dev: generic starget or parent of generic stargets to be removed
1392  *
1393  * Note: This is slightly racy.  It is possible that if the user
1394  * requests the addition of another device then the target won't be
1395  * removed.
1396  */
1397 void scsi_remove_target(struct device *dev)
1398 {
1399         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1400         struct scsi_target *starget;
1401         unsigned long flags;
1402
1403 restart:
1404         spin_lock_irqsave(shost->host_lock, flags);
1405         list_for_each_entry(starget, &shost->__targets, siblings) {
1406                 if (starget->state == STARGET_DEL ||
1407                     starget->state == STARGET_REMOVE ||
1408                     starget->state == STARGET_CREATED_REMOVE)
1409                         continue;
1410                 if (starget->dev.parent == dev || &starget->dev == dev) {
1411                         kref_get(&starget->reap_ref);
1412                         if (starget->state == STARGET_CREATED)
1413                                 starget->state = STARGET_CREATED_REMOVE;
1414                         else
1415                                 starget->state = STARGET_REMOVE;
1416                         spin_unlock_irqrestore(shost->host_lock, flags);
1417                         __scsi_remove_target(starget);
1418                         scsi_target_reap(starget);
1419                         goto restart;
1420                 }
1421         }
1422         spin_unlock_irqrestore(shost->host_lock, flags);
1423 }
1424 EXPORT_SYMBOL(scsi_remove_target);
1425
1426 int scsi_register_driver(struct device_driver *drv)
1427 {
1428         drv->bus = &scsi_bus_type;
1429
1430         return driver_register(drv);
1431 }
1432 EXPORT_SYMBOL(scsi_register_driver);
1433
1434 int scsi_register_interface(struct class_interface *intf)
1435 {
1436         intf->class = &sdev_class;
1437
1438         return class_interface_register(intf);
1439 }
1440 EXPORT_SYMBOL(scsi_register_interface);
1441
1442 /**
1443  * scsi_sysfs_add_host - add scsi host to subsystem
1444  * @shost:     scsi host struct to add to subsystem
1445  **/
1446 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1447 {
1448         int error, i;
1449
1450         /* add host specific attributes */
1451         if (shost->hostt->shost_attrs) {
1452                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1453                         error = device_create_file(&shost->shost_dev,
1454                                         shost->hostt->shost_attrs[i]);
1455                         if (error)
1456                                 return error;
1457                 }
1458         }
1459
1460         transport_register_device(&shost->shost_gendev);
1461         transport_configure_device(&shost->shost_gendev);
1462         return 0;
1463 }
1464
1465 static struct device_type scsi_dev_type = {
1466         .name =         "scsi_device",
1467         .release =      scsi_device_dev_release,
1468         .groups =       scsi_sdev_attr_groups,
1469 };
1470
1471 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1472 {
1473         unsigned long flags;
1474         struct Scsi_Host *shost = sdev->host;
1475         struct scsi_target  *starget = sdev->sdev_target;
1476
1477         device_initialize(&sdev->sdev_gendev);
1478         sdev->sdev_gendev.bus = &scsi_bus_type;
1479         sdev->sdev_gendev.type = &scsi_dev_type;
1480         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1481                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1482
1483         device_initialize(&sdev->sdev_dev);
1484         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1485         sdev->sdev_dev.class = &sdev_class;
1486         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1487                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1488         /*
1489          * Get a default scsi_level from the target (derived from sibling
1490          * devices).  This is the best we can do for guessing how to set
1491          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1492          * setting doesn't matter, because all the bits are zero anyway.
1493          * But it does matter for higher LUNs.
1494          */
1495         sdev->scsi_level = starget->scsi_level;
1496         if (sdev->scsi_level <= SCSI_2 &&
1497                         sdev->scsi_level != SCSI_UNKNOWN &&
1498                         !shost->no_scsi2_lun_in_cdb)
1499                 sdev->lun_in_cdb = 1;
1500
1501         transport_setup_device(&sdev->sdev_gendev);
1502         spin_lock_irqsave(shost->host_lock, flags);
1503         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1504         list_add_tail(&sdev->siblings, &shost->__devices);
1505         spin_unlock_irqrestore(shost->host_lock, flags);
1506         /*
1507          * device can now only be removed via __scsi_remove_device() so hold
1508          * the target.  Target will be held in CREATED state until something
1509          * beneath it becomes visible (in which case it moves to RUNNING)
1510          */
1511         kref_get(&starget->reap_ref);
1512 }
1513
1514 int scsi_is_sdev_device(const struct device *dev)
1515 {
1516         return dev->type == &scsi_dev_type;
1517 }
1518 EXPORT_SYMBOL(scsi_is_sdev_device);
1519
1520 /* A blank transport template that is used in drivers that don't
1521  * yet implement Transport Attributes */
1522 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };