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;
 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         if (scsi_device_set_state(sdev, state))
 738                 return -EINVAL;
 739         return count;
 740 }
 741
 742 static ssize_t
 743 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 744 {
 745         struct scsi_device *sdev = to_scsi_device(dev);
 746         const char *name = scsi_device_state_name(sdev->sdev_state);
 747
 748         if (!name)
 749                 return -EINVAL;
 750
 751         return snprintf(buf, 20, "%s\n", name);
 752 }
 753
 754 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 755
 756 static ssize_t
 757 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 758                       char *buf)
 759 {
 760         struct scsi_device *sdev = to_scsi_device(dev);
 761         const char *name = "none";
 762
 763         if (sdev->simple_tags)
 764                 name = "simple";
 765
 766         return snprintf(buf, 20, "%s\n", name);
 767 }
 768
 769 static ssize_t
 770 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 771                        const char *buf, size_t count)
 772 {
 773         struct scsi_device *sdev = to_scsi_device(dev);
 774
 775         if (!sdev->tagged_supported)
 776                 return -EINVAL;
 777
 778         sdev_printk(KERN_INFO, sdev,
 779                     "ignoring write to deprecated queue_type attribute");
 780         return count;
 781 }
 782
 783 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 784                    store_queue_type_field);
 785
 786 #define sdev_vpd_pg_attr(_page)                                         \
 787 static ssize_t                                                  \
 788 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 789                  struct bin_attribute *bin_attr,                        \
 790                  char *buf, loff_t off, size_t count)                   \
 791 {                                                                       \
 792         struct device *dev = container_of(kobj, struct device, kobj);   \
 793         struct scsi_device *sdev = to_scsi_device(dev);                 \
 794         int ret;                                                        \
 795         if (!sdev->vpd_##_page)                                         \
 796                 return -EINVAL;                                         \
 797         rcu_read_lock();                                                \
 798         ret = memory_read_from_buffer(buf, count, &off,                 \
 799                                       rcu_dereference(sdev->vpd_##_page), \
 800                                        sdev->vpd_##_page##_len);        \
 801         rcu_read_unlock();                                              \
 802         return ret;                                             \
 803 }                                                                       \
 804 static struct bin_attribute dev_attr_vpd_##_page = {            \
 805         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 806         .size = 0,                                                      \
 807         .read = show_vpd_##_page,                                       \
 808 };
 809
 810 sdev_vpd_pg_attr(pg83);
 811 sdev_vpd_pg_attr(pg80);
 812
 813 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 814                             struct bin_attribute *bin_attr,
 815                             char *buf, loff_t off, size_t count)
 816 {
 817         struct device *dev = container_of(kobj, struct device, kobj);
 818         struct scsi_device *sdev = to_scsi_device(dev);
 819
 820         if (!sdev->inquiry)
 821                 return -EINVAL;
 822
 823         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 824                                        sdev->inquiry_len);
 825 }
 826
 827 static struct bin_attribute dev_attr_inquiry = {
 828         .attr = {
 829                 .name = "inquiry",
 830                 .mode = S_IRUGO,
 831         },
 832         .size = 0,
 833         .read = show_inquiry,
 834 };
 835
 836 static ssize_t
 837 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 838                         char *buf)
 839 {
 840         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 841 }
 842
 843 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 844
 845 #define show_sdev_iostat(field)                                         \
 846 static ssize_t                                                          \
 847 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 848                     char *buf)                                          \
 849 {                                                                       \
 850         struct scsi_device *sdev = to_scsi_device(dev);                 \
 851         unsigned long long count = atomic_read(&sdev->field);           \
 852         return snprintf(buf, 20, "0x%llx\n", count);                    \
 853 }                                                                       \
 854 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 855
 856 show_sdev_iostat(iorequest_cnt);
 857 show_sdev_iostat(iodone_cnt);
 858 show_sdev_iostat(ioerr_cnt);
 859
 860 static ssize_t
 861 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 862 {
 863         struct scsi_device *sdev;
 864         sdev = to_scsi_device(dev);
 865         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 866 }
 867 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 868
 869 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 870 static ssize_t                                                          \
 871 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 872                      char *buf)                                         \
 873 {                                                                       \
 874         struct scsi_device *sdev = to_scsi_device(dev);                 \
 875         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 876         return snprintf(buf, 20, "%d\n", val);                          \
 877 }
 878
 879 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 880 static ssize_t                                                          \
 881 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 882                       const char *buf, size_t count)                    \
 883 {                                                                       \
 884         struct scsi_device *sdev = to_scsi_device(dev);                 \
 885         int val = simple_strtoul(buf, NULL, 0);                         \
 886         if (val == 0)                                                   \
 887                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 888         else if (val == 1)                                              \
 889                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 890         else                                                            \
 891                 return -EINVAL;                                         \
 892         return count;                                                   \
 893 }
 894
 895 #define DECLARE_EVT(name, Cap_name)                                     \
 896         DECLARE_EVT_SHOW(name, Cap_name)                                \
 897         DECLARE_EVT_STORE(name, Cap_name)                               \
 898         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 899                            sdev_store_evt_##name);
 900 #define REF_EVT(name) &dev_attr_evt_##name.attr
 901
 902 DECLARE_EVT(media_change, MEDIA_CHANGE)
 903 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 904 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 905 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 906 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 907 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 908
 909 static ssize_t
 910 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 911                        const char *buf, size_t count)
 912 {
 913         int depth, retval;
 914         struct scsi_device *sdev = to_scsi_device(dev);
 915         struct scsi_host_template *sht = sdev->host->hostt;
 916
 917         if (!sht->change_queue_depth)
 918                 return -EINVAL;
 919
 920         depth = simple_strtoul(buf, NULL, 0);
 921
 922         if (depth < 1 || depth > sdev->host->can_queue)
 923                 return -EINVAL;
 924
 925         retval = sht->change_queue_depth(sdev, depth);
 926         if (retval < 0)
 927                 return retval;
 928
 929         sdev->max_queue_depth = sdev->queue_depth;
 930
 931         return count;
 932 }
 933 sdev_show_function(queue_depth, "%d\n");
 934
 935 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 936                    sdev_store_queue_depth);
 937
 938 static ssize_t
 939 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
 940                     char *buf)
 941 {
 942         struct scsi_device *sdev = to_scsi_device(dev);
 943         ssize_t count;
 944
 945         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
 946         if (count > 0) {
 947                 buf[count] = '\n';
 948                 count++;
 949         }
 950         return count;
 951 }
 952 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
 953
 954 #ifdef CONFIG_SCSI_DH
 955 static ssize_t
 956 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
 957                    char *buf)
 958 {
 959         struct scsi_device *sdev = to_scsi_device(dev);
 960
 961         if (!sdev->handler)
 962                 return snprintf(buf, 20, "detached\n");
 963
 964         return snprintf(buf, 20, "%s\n", sdev->handler->name);
 965 }
 966
 967 static ssize_t
 968 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
 969                     const char *buf, size_t count)
 970 {
 971         struct scsi_device *sdev = to_scsi_device(dev);
 972         int err = -EINVAL;
 973
 974         if (sdev->sdev_state == SDEV_CANCEL ||
 975             sdev->sdev_state == SDEV_DEL)
 976                 return -ENODEV;
 977
 978         if (!sdev->handler) {
 979                 /*
 980                  * Attach to a device handler
 981                  */
 982                 err = scsi_dh_attach(sdev->request_queue, buf);
 983         } else if (!strncmp(buf, "activate", 8)) {
 984                 /*
 985                  * Activate a device handler
 986                  */
 987                 if (sdev->handler->activate)
 988                         err = sdev->handler->activate(sdev, NULL, NULL);
 989                 else
 990                         err = 0;
 991         } else if (!strncmp(buf, "detach", 6)) {
 992                 /*
 993                  * Detach from a device handler
 994                  */
 995                 sdev_printk(KERN_WARNING, sdev,
 996                             "can't detach handler %s.\n",
 997                             sdev->handler->name);
 998                 err = -EINVAL;
 999         }
1000
1001         return err < 0 ? err : count;
1002 }
1003
1004 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1005                    sdev_store_dh_state);
1006
1007 static ssize_t
1008 sdev_show_access_state(struct device *dev,
1009                        struct device_attribute *attr,
1010                        char *buf)
1011 {
1012         struct scsi_device *sdev = to_scsi_device(dev);
1013         unsigned char access_state;
1014         const char *access_state_name;
1015
1016         if (!sdev->handler)
1017                 return -EINVAL;
1018
1019         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1020         access_state_name = scsi_access_state_name(access_state);
1021
1022         return sprintf(buf, "%s\n",
1023                        access_state_name ? access_state_name : "unknown");
1024 }
1025 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1026
1027 static ssize_t
1028 sdev_show_preferred_path(struct device *dev,
1029                          struct device_attribute *attr,
1030                          char *buf)
1031 {
1032         struct scsi_device *sdev = to_scsi_device(dev);
1033
1034         if (!sdev->handler)
1035                 return -EINVAL;
1036
1037         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1038                 return sprintf(buf, "1\n");
1039         else
1040                 return sprintf(buf, "0\n");
1041 }
1042 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1043 #endif
1044
1045 static ssize_t
1046 sdev_show_queue_ramp_up_period(struct device *dev,
1047                                struct device_attribute *attr,
1048                                char *buf)
1049 {
1050         struct scsi_device *sdev;
1051         sdev = to_scsi_device(dev);
1052         return snprintf(buf, 20, "%u\n",
1053                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1054 }
1055
1056 static ssize_t
1057 sdev_store_queue_ramp_up_period(struct device *dev,
1058                                 struct device_attribute *attr,
1059                                 const char *buf, size_t count)
1060 {
1061         struct scsi_device *sdev = to_scsi_device(dev);
1062         unsigned int period;
1063
1064         if (kstrtouint(buf, 10, &period))
1065                 return -EINVAL;
1066
1067         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1068         return count;
1069 }
1070
1071 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1072                    sdev_show_queue_ramp_up_period,
1073                    sdev_store_queue_ramp_up_period);
1074
1075 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1076                                          struct attribute *attr, int i)
1077 {
1078         struct device *dev = container_of(kobj, struct device, kobj);
1079         struct scsi_device *sdev = to_scsi_device(dev);
1080
1081
1082         if (attr == &dev_attr_queue_depth.attr &&
1083             !sdev->host->hostt->change_queue_depth)
1084                 return S_IRUGO;
1085
1086         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1087             !sdev->host->hostt->change_queue_depth)
1088                 return 0;
1089
1090 #ifdef CONFIG_SCSI_DH
1091         if (attr == &dev_attr_access_state.attr &&
1092             !sdev->handler)
1093                 return 0;
1094         if (attr == &dev_attr_preferred_path.attr &&
1095             !sdev->handler)
1096                 return 0;
1097 #endif
1098         return attr->mode;
1099 }
1100
1101 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1102                                              struct bin_attribute *attr, int i)
1103 {
1104         struct device *dev = container_of(kobj, struct device, kobj);
1105         struct scsi_device *sdev = to_scsi_device(dev);
1106
1107
1108         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1109                 return 0;
1110
1111         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1112                 return 0;
1113
1114         return S_IRUGO;
1115 }
1116
1117 /* Default template for device attributes.  May NOT be modified */
1118 static struct attribute *scsi_sdev_attrs[] = {
1119         &dev_attr_device_blocked.attr,
1120         &dev_attr_type.attr,
1121         &dev_attr_scsi_level.attr,
1122         &dev_attr_device_busy.attr,
1123         &dev_attr_vendor.attr,
1124         &dev_attr_model.attr,
1125         &dev_attr_rev.attr,
1126         &dev_attr_rescan.attr,
1127         &dev_attr_delete.attr,
1128         &dev_attr_state.attr,
1129         &dev_attr_timeout.attr,
1130         &dev_attr_eh_timeout.attr,
1131         &dev_attr_iocounterbits.attr,
1132         &dev_attr_iorequest_cnt.attr,
1133         &dev_attr_iodone_cnt.attr,
1134         &dev_attr_ioerr_cnt.attr,
1135         &dev_attr_modalias.attr,
1136         &dev_attr_queue_depth.attr,
1137         &dev_attr_queue_type.attr,
1138         &dev_attr_wwid.attr,
1139 #ifdef CONFIG_SCSI_DH
1140         &dev_attr_dh_state.attr,
1141         &dev_attr_access_state.attr,
1142         &dev_attr_preferred_path.attr,
1143 #endif
1144         &dev_attr_queue_ramp_up_period.attr,
1145         REF_EVT(media_change),
1146         REF_EVT(inquiry_change_reported),
1147         REF_EVT(capacity_change_reported),
1148         REF_EVT(soft_threshold_reached),
1149         REF_EVT(mode_parameter_change_reported),
1150         REF_EVT(lun_change_reported),
1151         NULL
1152 };
1153
1154 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1155         &dev_attr_vpd_pg83,
1156         &dev_attr_vpd_pg80,
1157         &dev_attr_inquiry,
1158         NULL
1159 };
1160 static struct attribute_group scsi_sdev_attr_group = {
1161         .attrs =        scsi_sdev_attrs,
1162         .bin_attrs =    scsi_sdev_bin_attrs,
1163         .is_visible =   scsi_sdev_attr_is_visible,
1164         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1165 };
1166
1167 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1168         &scsi_sdev_attr_group,
1169         NULL
1170 };
1171
1172 static int scsi_target_add(struct scsi_target *starget)
1173 {
1174         int error;
1175
1176         if (starget->state != STARGET_CREATED)
1177                 return 0;
1178
1179         error = device_add(&starget->dev);
1180         if (error) {
1181                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1182                 return error;
1183         }
1184         transport_add_device(&starget->dev);
1185         starget->state = STARGET_RUNNING;
1186
1187         pm_runtime_set_active(&starget->dev);
1188         pm_runtime_enable(&starget->dev);
1189         device_enable_async_suspend(&starget->dev);
1190
1191         return 0;
1192 }
1193
1194 /**
1195  * scsi_sysfs_add_sdev - add scsi device to sysfs
1196  * @sdev:       scsi_device to add
1197  *
1198  * Return value:
1199  *      0 on Success / non-zero on Failure
1200  **/
1201 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1202 {
1203         int error, i;
1204         struct request_queue *rq = sdev->request_queue;
1205         struct scsi_target *starget = sdev->sdev_target;
1206
1207         error = scsi_target_add(starget);
1208         if (error)
1209                 return error;
1210
1211         transport_configure_device(&starget->dev);
1212
1213         device_enable_async_suspend(&sdev->sdev_gendev);
1214         scsi_autopm_get_target(starget);
1215         pm_runtime_set_active(&sdev->sdev_gendev);
1216         pm_runtime_forbid(&sdev->sdev_gendev);
1217         pm_runtime_enable(&sdev->sdev_gendev);
1218         scsi_autopm_put_target(starget);
1219
1220         scsi_autopm_get_device(sdev);
1221
1222         error = scsi_dh_add_device(sdev);
1223         if (error)
1224                 /*
1225                  * device_handler is optional, so any error can be ignored
1226                  */
1227                 sdev_printk(KERN_INFO, sdev,
1228                                 "failed to add device handler: %d\n", error);
1229
1230         error = device_add(&sdev->sdev_gendev);
1231         if (error) {
1232                 sdev_printk(KERN_INFO, sdev,
1233                                 "failed to add device: %d\n", error);
1234                 scsi_dh_remove_device(sdev);
1235                 return error;
1236         }
1237
1238         device_enable_async_suspend(&sdev->sdev_dev);
1239         error = device_add(&sdev->sdev_dev);
1240         if (error) {
1241                 sdev_printk(KERN_INFO, sdev,
1242                                 "failed to add class device: %d\n", error);
1243                 scsi_dh_remove_device(sdev);
1244                 device_del(&sdev->sdev_gendev);
1245                 return error;
1246         }
1247         transport_add_device(&sdev->sdev_gendev);
1248         sdev->is_visible = 1;
1249
1250         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1251
1252         if (error)
1253                 /* we're treating error on bsg register as non-fatal,
1254                  * so pretend nothing went wrong */
1255                 sdev_printk(KERN_INFO, sdev,
1256                             "Failed to register bsg queue, errno=%d\n", error);
1257
1258         /* add additional host specific attributes */
1259         if (sdev->host->hostt->sdev_attrs) {
1260                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1261                         error = device_create_file(&sdev->sdev_gendev,
1262                                         sdev->host->hostt->sdev_attrs[i]);
1263                         if (error)
1264                                 return error;
1265                 }
1266         }
1267
1268         scsi_autopm_put_device(sdev);
1269         return error;
1270 }
1271
1272 void __scsi_remove_device(struct scsi_device *sdev)
1273 {
1274         struct device *dev = &sdev->sdev_gendev;
1275
1276         /*
1277          * This cleanup path is not reentrant and while it is impossible
1278          * to get a new reference with scsi_device_get() someone can still
1279          * hold a previously acquired one.
1280          */
1281         if (sdev->sdev_state == SDEV_DEL)
1282                 return;
1283
1284         if (sdev->is_visible) {
1285                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
1286                         return;
1287
1288                 bsg_unregister_queue(sdev->request_queue);
1289                 device_unregister(&sdev->sdev_dev);
1290                 transport_remove_device(dev);
1291                 scsi_dh_remove_device(sdev);
1292                 device_del(dev);
1293         } else
1294                 put_device(&sdev->sdev_dev);
1295
1296         /*
1297          * Stop accepting new requests and wait until all queuecommand() and
1298          * scsi_run_queue() invocations have finished before tearing down the
1299          * device.
1300          */
1301         scsi_device_set_state(sdev, SDEV_DEL);
1302         blk_cleanup_queue(sdev->request_queue);
1303         cancel_work_sync(&sdev->requeue_work);
1304
1305         if (sdev->host->hostt->slave_destroy)
1306                 sdev->host->hostt->slave_destroy(sdev);
1307         transport_destroy_device(dev);
1308
1309         /*
1310          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1311          * remoed sysfs visibility from the device, so make the target
1312          * invisible if this was the last device underneath it.
1313          */
1314         scsi_target_reap(scsi_target(sdev));
1315
1316         put_device(dev);
1317 }
1318
1319 /**
1320  * scsi_remove_device - unregister a device from the scsi bus
1321  * @sdev:       scsi_device to unregister
1322  **/
1323 void scsi_remove_device(struct scsi_device *sdev)
1324 {
1325         struct Scsi_Host *shost = sdev->host;
1326
1327         mutex_lock(&shost->scan_mutex);
1328         __scsi_remove_device(sdev);
1329         mutex_unlock(&shost->scan_mutex);
1330 }
1331 EXPORT_SYMBOL(scsi_remove_device);
1332
1333 static void __scsi_remove_target(struct scsi_target *starget)
1334 {
1335         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1336         unsigned long flags;
1337         struct scsi_device *sdev;
1338
1339         spin_lock_irqsave(shost->host_lock, flags);
1340  restart:
1341         list_for_each_entry(sdev, &shost->__devices, siblings) {
1342                 if (sdev->channel != starget->channel ||
1343                     sdev->id != starget->id ||
1344                     scsi_device_get(sdev))
1345                         continue;
1346                 spin_unlock_irqrestore(shost->host_lock, flags);
1347                 scsi_remove_device(sdev);
1348                 scsi_device_put(sdev);
1349                 spin_lock_irqsave(shost->host_lock, flags);
1350                 goto restart;
1351         }
1352         spin_unlock_irqrestore(shost->host_lock, flags);
1353 }
1354
1355 /**
1356  * scsi_remove_target - try to remove a target and all its devices
1357  * @dev: generic starget or parent of generic stargets to be removed
1358  *
1359  * Note: This is slightly racy.  It is possible that if the user
1360  * requests the addition of another device then the target won't be
1361  * removed.
1362  */
1363 void scsi_remove_target(struct device *dev)
1364 {
1365         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1366         struct scsi_target *starget;
1367         unsigned long flags;
1368
1369 restart:
1370         spin_lock_irqsave(shost->host_lock, flags);
1371         list_for_each_entry(starget, &shost->__targets, siblings) {
1372                 if (starget->state == STARGET_DEL ||
1373                     starget->state == STARGET_REMOVE)
1374                         continue;
1375                 if (starget->dev.parent == dev || &starget->dev == dev) {
1376                         kref_get(&starget->reap_ref);
1377                         starget->state = STARGET_REMOVE;
1378                         spin_unlock_irqrestore(shost->host_lock, flags);
1379                         __scsi_remove_target(starget);
1380                         scsi_target_reap(starget);
1381                         goto restart;
1382                 }
1383         }
1384         spin_unlock_irqrestore(shost->host_lock, flags);
1385 }
1386 EXPORT_SYMBOL(scsi_remove_target);
1387
1388 int scsi_register_driver(struct device_driver *drv)
1389 {
1390         drv->bus = &scsi_bus_type;
1391
1392         return driver_register(drv);
1393 }
1394 EXPORT_SYMBOL(scsi_register_driver);
1395
1396 int scsi_register_interface(struct class_interface *intf)
1397 {
1398         intf->class = &sdev_class;
1399
1400         return class_interface_register(intf);
1401 }
1402 EXPORT_SYMBOL(scsi_register_interface);
1403
1404 /**
1405  * scsi_sysfs_add_host - add scsi host to subsystem
1406  * @shost:     scsi host struct to add to subsystem
1407  **/
1408 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1409 {
1410         int error, i;
1411
1412         /* add host specific attributes */
1413         if (shost->hostt->shost_attrs) {
1414                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1415                         error = device_create_file(&shost->shost_dev,
1416                                         shost->hostt->shost_attrs[i]);
1417                         if (error)
1418                                 return error;
1419                 }
1420         }
1421
1422         transport_register_device(&shost->shost_gendev);
1423         transport_configure_device(&shost->shost_gendev);
1424         return 0;
1425 }
1426
1427 static struct device_type scsi_dev_type = {
1428         .name =         "scsi_device",
1429         .release =      scsi_device_dev_release,
1430         .groups =       scsi_sdev_attr_groups,
1431 };
1432
1433 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1434 {
1435         unsigned long flags;
1436         struct Scsi_Host *shost = sdev->host;
1437         struct scsi_target  *starget = sdev->sdev_target;
1438
1439         device_initialize(&sdev->sdev_gendev);
1440         sdev->sdev_gendev.bus = &scsi_bus_type;
1441         sdev->sdev_gendev.type = &scsi_dev_type;
1442         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1443                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1444
1445         device_initialize(&sdev->sdev_dev);
1446         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1447         sdev->sdev_dev.class = &sdev_class;
1448         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1449                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1450         /*
1451          * Get a default scsi_level from the target (derived from sibling
1452          * devices).  This is the best we can do for guessing how to set
1453          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1454          * setting doesn't matter, because all the bits are zero anyway.
1455          * But it does matter for higher LUNs.
1456          */
1457         sdev->scsi_level = starget->scsi_level;
1458         if (sdev->scsi_level <= SCSI_2 &&
1459                         sdev->scsi_level != SCSI_UNKNOWN &&
1460                         !shost->no_scsi2_lun_in_cdb)
1461                 sdev->lun_in_cdb = 1;
1462
1463         transport_setup_device(&sdev->sdev_gendev);
1464         spin_lock_irqsave(shost->host_lock, flags);
1465         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1466         list_add_tail(&sdev->siblings, &shost->__devices);
1467         spin_unlock_irqrestore(shost->host_lock, flags);
1468         /*
1469          * device can now only be removed via __scsi_remove_device() so hold
1470          * the target.  Target will be held in CREATED state until something
1471          * beneath it becomes visible (in which case it moves to RUNNING)
1472          */
1473         kref_get(&starget->reap_ref);
1474 }
1475
1476 int scsi_is_sdev_device(const struct device *dev)
1477 {
1478         return dev->type == &scsi_dev_type;
1479 }
1480 EXPORT_SYMBOL(scsi_is_sdev_device);
1481
1482 /* A blank transport template that is used in drivers that don't
1483  * yet implement Transport Attributes */
1484 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };