drivers/scsi/scsi_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * scsi_sysfs.c
   4  *
   5  * SCSI sysfs interface routines.
   6  *
   7  * Created to pull SCSI mid layer sysfs routines into one file.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/init.h>
  13 #include <linux/blkdev.h>
  14 #include <linux/device.h>
  15 #include <linux/pm_runtime.h>
  16
  17 #include <scsi/scsi.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_host.h>
  20 #include <scsi/scsi_tcq.h>
  21 #include <scsi/scsi_dh.h>
  22 #include <scsi/scsi_transport.h>
  23 #include <scsi/scsi_driver.h>
  24 #include <scsi/scsi_devinfo.h>
  25
  26 #include "scsi_priv.h"
  27 #include "scsi_logging.h"
  28
  29 static struct device_type scsi_dev_type;
  30
  31 static const struct {
  32         enum scsi_device_state  value;
  33         char                    *name;
  34 } sdev_states[] = {
  35         { SDEV_CREATED, "created" },
  36         { SDEV_RUNNING, "running" },
  37         { SDEV_CANCEL, "cancel" },
  38         { SDEV_DEL, "deleted" },
  39         { SDEV_QUIESCE, "quiesce" },
  40         { SDEV_OFFLINE, "offline" },
  41         { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  42         { SDEV_BLOCK,   "blocked" },
  43         { SDEV_CREATED_BLOCK, "created-blocked" },
  44 };
  45
  46 const char *scsi_device_state_name(enum scsi_device_state state)
  47 {
  48         int i;
  49         char *name = NULL;
  50
  51         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  52                 if (sdev_states[i].value == state) {
  53                         name = sdev_states[i].name;
  54                         break;
  55                 }
  56         }
  57         return name;
  58 }
  59
  60 static const struct {
  61         enum scsi_host_state    value;
  62         char                    *name;
  63 } shost_states[] = {
  64         { SHOST_CREATED, "created" },
  65         { SHOST_RUNNING, "running" },
  66         { SHOST_CANCEL, "cancel" },
  67         { SHOST_DEL, "deleted" },
  68         { SHOST_RECOVERY, "recovery" },
  69         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  70         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  71 };
  72 const char *scsi_host_state_name(enum scsi_host_state state)
  73 {
  74         int i;
  75         char *name = NULL;
  76
  77         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  78                 if (shost_states[i].value == state) {
  79                         name = shost_states[i].name;
  80                         break;
  81                 }
  82         }
  83         return name;
  84 }
  85
  86 #ifdef CONFIG_SCSI_DH
  87 static const struct {
  88         unsigned char   value;
  89         char            *name;
  90 } sdev_access_states[] = {
  91         { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
  92         { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
  93         { SCSI_ACCESS_STATE_STANDBY, "standby" },
  94         { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
  95         { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
  96         { SCSI_ACCESS_STATE_OFFLINE, "offline" },
  97         { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
  98 };
  99
 100 static const char *scsi_access_state_name(unsigned char state)
 101 {
 102         int i;
 103         char *name = NULL;
 104
 105         for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
 106                 if (sdev_access_states[i].value == state) {
 107                         name = sdev_access_states[i].name;
 108                         break;
 109                 }
 110         }
 111         return name;
 112 }
 113 #endif
 114
 115 static int check_set(unsigned long long *val, char *src)
 116 {
 117         char *last;
 118
 119         if (strcmp(src, "-") == 0) {
 120                 *val = SCAN_WILD_CARD;
 121         } else {
 122                 /*
 123                  * Doesn't check for int overflow
 124                  */
 125                 *val = simple_strtoull(src, &last, 0);
 126                 if (*last != '\0')
 127                         return 1;
 128         }
 129         return 0;
 130 }
 131
 132 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 133 {
 134         char s1[15], s2[15], s3[17], junk;
 135         unsigned long long channel, id, lun;
 136         int res;
 137
 138         res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
 139         if (res != 3)
 140                 return -EINVAL;
 141         if (check_set(&channel, s1))
 142                 return -EINVAL;
 143         if (check_set(&id, s2))
 144                 return -EINVAL;
 145         if (check_set(&lun, s3))
 146                 return -EINVAL;
 147         if (shost->transportt->user_scan)
 148                 res = shost->transportt->user_scan(shost, channel, id, lun);
 149         else
 150                 res = scsi_scan_host_selected(shost, channel, id, lun,
 151                                               SCSI_SCAN_MANUAL);
 152         return res;
 153 }
 154
 155 /*
 156  * shost_show_function: macro to create an attr function that can be used to
 157  * show a non-bit field.
 158  */
 159 #define shost_show_function(name, field, format_string)                 \
 160 static ssize_t                                                          \
 161 show_##name (struct device *dev, struct device_attribute *attr,         \
 162              char *buf)                                                 \
 163 {                                                                       \
 164         struct Scsi_Host *shost = class_to_shost(dev);                  \
 165         return snprintf (buf, 20, format_string, shost->field);         \
 166 }
 167
 168 /*
 169  * shost_rd_attr: macro to create a function and attribute variable for a
 170  * read only field.
 171  */
 172 #define shost_rd_attr2(name, field, format_string)                      \
 173         shost_show_function(name, field, format_string)                 \
 174 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 175
 176 #define shost_rd_attr(field, format_string) \
 177 shost_rd_attr2(field, field, format_string)
 178
 179 /*
 180  * Create the actual show/store functions and data structures.
 181  */
 182
 183 static ssize_t
 184 store_scan(struct device *dev, struct device_attribute *attr,
 185            const char *buf, size_t count)
 186 {
 187         struct Scsi_Host *shost = class_to_shost(dev);
 188         int res;
 189
 190         res = scsi_scan(shost, buf);
 191         if (res == 0)
 192                 res = count;
 193         return res;
 194 };
 195 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 196
 197 static ssize_t
 198 store_shost_state(struct device *dev, struct device_attribute *attr,
 199                   const char *buf, size_t count)
 200 {
 201         int i;
 202         struct Scsi_Host *shost = class_to_shost(dev);
 203         enum scsi_host_state state = 0;
 204
 205         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 206                 const int len = strlen(shost_states[i].name);
 207                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 208                    buf[len] == '\n') {
 209                         state = shost_states[i].value;
 210                         break;
 211                 }
 212         }
 213         if (!state)
 214                 return -EINVAL;
 215
 216         if (scsi_host_set_state(shost, state))
 217                 return -EINVAL;
 218         return count;
 219 }
 220
 221 static ssize_t
 222 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 223 {
 224         struct Scsi_Host *shost = class_to_shost(dev);
 225         const char *name = scsi_host_state_name(shost->shost_state);
 226
 227         if (!name)
 228                 return -EINVAL;
 229
 230         return snprintf(buf, 20, "%s\n", name);
 231 }
 232
 233 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 234 static struct device_attribute dev_attr_hstate =
 235         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 236
 237 static ssize_t
 238 show_shost_mode(unsigned int mode, char *buf)
 239 {
 240         ssize_t len = 0;
 241
 242         if (mode & MODE_INITIATOR)
 243                 len = sprintf(buf, "%s", "Initiator");
 244
 245         if (mode & MODE_TARGET)
 246                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 247
 248         len += sprintf(buf + len, "\n");
 249
 250         return len;
 251 }
 252
 253 static ssize_t
 254 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 255                           char *buf)
 256 {
 257         struct Scsi_Host *shost = class_to_shost(dev);
 258         unsigned int supported_mode = shost->hostt->supported_mode;
 259
 260         if (supported_mode == MODE_UNKNOWN)
 261                 /* by default this should be initiator */
 262                 supported_mode = MODE_INITIATOR;
 263
 264         return show_shost_mode(supported_mode, buf);
 265 }
 266
 267 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 268
 269 static ssize_t
 270 show_shost_active_mode(struct device *dev,
 271                        struct device_attribute *attr, char *buf)
 272 {
 273         struct Scsi_Host *shost = class_to_shost(dev);
 274
 275         if (shost->active_mode == MODE_UNKNOWN)
 276                 return snprintf(buf, 20, "unknown\n");
 277         else
 278                 return show_shost_mode(shost->active_mode, buf);
 279 }
 280
 281 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 282
 283 static int check_reset_type(const char *str)
 284 {
 285         if (sysfs_streq(str, "adapter"))
 286                 return SCSI_ADAPTER_RESET;
 287         else if (sysfs_streq(str, "firmware"))
 288                 return SCSI_FIRMWARE_RESET;
 289         else
 290                 return 0;
 291 }
 292
 293 static ssize_t
 294 store_host_reset(struct device *dev, struct device_attribute *attr,
 295                 const char *buf, size_t count)
 296 {
 297         struct Scsi_Host *shost = class_to_shost(dev);
 298         struct scsi_host_template *sht = shost->hostt;
 299         int ret = -EINVAL;
 300         int type;
 301
 302         type = check_reset_type(buf);
 303         if (!type)
 304                 goto exit_store_host_reset;
 305
 306         if (sht->host_reset)
 307                 ret = sht->host_reset(shost, type);
 308         else
 309                 ret = -EOPNOTSUPP;
 310
 311 exit_store_host_reset:
 312         if (ret == 0)
 313                 ret = count;
 314         return ret;
 315 }
 316
 317 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 318
 319 static ssize_t
 320 show_shost_eh_deadline(struct device *dev,
 321                       struct device_attribute *attr, char *buf)
 322 {
 323         struct Scsi_Host *shost = class_to_shost(dev);
 324
 325         if (shost->eh_deadline == -1)
 326                 return snprintf(buf, strlen("off") + 2, "off\n");
 327         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 328 }
 329
 330 static ssize_t
 331 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 332                 const char *buf, size_t count)
 333 {
 334         struct Scsi_Host *shost = class_to_shost(dev);
 335         int ret = -EINVAL;
 336         unsigned long deadline, flags;
 337
 338         if (shost->transportt &&
 339             (shost->transportt->eh_strategy_handler ||
 340              !shost->hostt->eh_host_reset_handler))
 341                 return ret;
 342
 343         if (!strncmp(buf, "off", strlen("off")))
 344                 deadline = -1;
 345         else {
 346                 ret = kstrtoul(buf, 10, &deadline);
 347                 if (ret)
 348                         return ret;
 349                 if (deadline * HZ > UINT_MAX)
 350                         return -EINVAL;
 351         }
 352
 353         spin_lock_irqsave(shost->host_lock, flags);
 354         if (scsi_host_in_recovery(shost))
 355                 ret = -EBUSY;
 356         else {
 357                 if (deadline == -1)
 358                         shost->eh_deadline = -1;
 359                 else
 360                         shost->eh_deadline = deadline * HZ;
 361
 362                 ret = count;
 363         }
 364         spin_unlock_irqrestore(shost->host_lock, flags);
 365
 366         return ret;
 367 }
 368
 369 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 370
 371 shost_rd_attr(unique_id, "%u\n");
 372 shost_rd_attr(cmd_per_lun, "%hd\n");
 373 shost_rd_attr(can_queue, "%hd\n");
 374 shost_rd_attr(sg_tablesize, "%hu\n");
 375 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 376 shost_rd_attr(unchecked_isa_dma, "%d\n");
 377 shost_rd_attr(prot_capabilities, "%u\n");
 378 shost_rd_attr(prot_guard_type, "%hd\n");
 379 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 380
 381 static ssize_t
 382 show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
 383 {
 384         struct Scsi_Host *shost = class_to_shost(dev);
 385         return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
 386 }
 387 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 388
 389 static ssize_t
 390 show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
 391 {
 392         return sprintf(buf, "1\n");
 393 }
 394 static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
 395
 396 static ssize_t
 397 show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf)
 398 {
 399         struct Scsi_Host *shost = class_to_shost(dev);
 400         struct blk_mq_tag_set *tag_set = &shost->tag_set;
 401
 402         return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues);
 403 }
 404 static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
 405
 406 static struct attribute *scsi_sysfs_shost_attrs[] = {
 407         &dev_attr_use_blk_mq.attr,
 408         &dev_attr_unique_id.attr,
 409         &dev_attr_host_busy.attr,
 410         &dev_attr_cmd_per_lun.attr,
 411         &dev_attr_can_queue.attr,
 412         &dev_attr_sg_tablesize.attr,
 413         &dev_attr_sg_prot_tablesize.attr,
 414         &dev_attr_unchecked_isa_dma.attr,
 415         &dev_attr_proc_name.attr,
 416         &dev_attr_scan.attr,
 417         &dev_attr_hstate.attr,
 418         &dev_attr_supported_mode.attr,
 419         &dev_attr_active_mode.attr,
 420         &dev_attr_prot_capabilities.attr,
 421         &dev_attr_prot_guard_type.attr,
 422         &dev_attr_host_reset.attr,
 423         &dev_attr_eh_deadline.attr,
 424         &dev_attr_nr_hw_queues.attr,
 425         NULL
 426 };
 427
 428 static struct attribute_group scsi_shost_attr_group = {
 429         .attrs =        scsi_sysfs_shost_attrs,
 430 };
 431
 432 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 433         &scsi_shost_attr_group,
 434         NULL
 435 };
 436
 437 static void scsi_device_cls_release(struct device *class_dev)
 438 {
 439         struct scsi_device *sdev;
 440
 441         sdev = class_to_sdev(class_dev);
 442         put_device(&sdev->sdev_gendev);
 443 }
 444
 445 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 446 {
 447         struct scsi_device *sdev;
 448         struct device *parent;
 449         struct list_head *this, *tmp;
 450         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 451         struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
 452         unsigned long flags;
 453         struct module *mod;
 454
 455         sdev = container_of(work, struct scsi_device, ew.work);
 456
 457         mod = sdev->host->hostt->module;
 458
 459         scsi_dh_release_device(sdev);
 460
 461         parent = sdev->sdev_gendev.parent;
 462
 463         spin_lock_irqsave(sdev->host->host_lock, flags);
 464         list_del(&sdev->siblings);
 465         list_del(&sdev->same_target_siblings);
 466         list_del(&sdev->starved_entry);
 467         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 468
 469         cancel_work_sync(&sdev->event_work);
 470
 471         list_for_each_safe(this, tmp, &sdev->event_list) {
 472                 struct scsi_event *evt;
 473
 474                 evt = list_entry(this, struct scsi_event, node);
 475                 list_del(&evt->node);
 476                 kfree(evt);
 477         }
 478
 479         blk_put_queue(sdev->request_queue);
 480         /* NULL queue means the device can't be used */
 481         sdev->request_queue = NULL;
 482
 483         mutex_lock(&sdev->inquiry_mutex);
 484         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 485                                        lockdep_is_held(&sdev->inquiry_mutex));
 486         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 487                                        lockdep_is_held(&sdev->inquiry_mutex));
 488         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 489                                        lockdep_is_held(&sdev->inquiry_mutex));
 490         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 491                                        lockdep_is_held(&sdev->inquiry_mutex));
 492         mutex_unlock(&sdev->inquiry_mutex);
 493
 494         if (vpd_pg0)
 495                 kfree_rcu(vpd_pg0, rcu);
 496         if (vpd_pg83)
 497                 kfree_rcu(vpd_pg83, rcu);
 498         if (vpd_pg80)
 499                 kfree_rcu(vpd_pg80, rcu);
 500         if (vpd_pg89)
 501                 kfree_rcu(vpd_pg89, rcu);
 502         kfree(sdev->inquiry);
 503         kfree(sdev);
 504
 505         if (parent)
 506                 put_device(parent);
 507         module_put(mod);
 508 }
 509
 510 static void scsi_device_dev_release(struct device *dev)
 511 {
 512         struct scsi_device *sdp = to_scsi_device(dev);
 513
 514         /* Set module pointer as NULL in case of module unloading */
 515         if (!try_module_get(sdp->host->hostt->module))
 516                 sdp->host->hostt->module = NULL;
 517
 518         execute_in_process_context(scsi_device_dev_release_usercontext,
 519                                    &sdp->ew);
 520 }
 521
 522 static struct class sdev_class = {
 523         .name           = "scsi_device",
 524         .dev_release    = scsi_device_cls_release,
 525 };
 526
 527 /* all probing is done in the individual ->probe routines */
 528 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 529 {
 530         struct scsi_device *sdp;
 531
 532         if (dev->type != &scsi_dev_type)
 533                 return 0;
 534
 535         sdp = to_scsi_device(dev);
 536         if (sdp->no_uld_attach)
 537                 return 0;
 538         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 539 }
 540
 541 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 542 {
 543         struct scsi_device *sdev;
 544
 545         if (dev->type != &scsi_dev_type)
 546                 return 0;
 547
 548         sdev = to_scsi_device(dev);
 549
 550         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 551         return 0;
 552 }
 553
 554 struct bus_type scsi_bus_type = {
 555         .name           = "scsi",
 556         .match          = scsi_bus_match,
 557         .uevent         = scsi_bus_uevent,
 558 #ifdef CONFIG_PM
 559         .pm             = &scsi_bus_pm_ops,
 560 #endif
 561 };
 562 EXPORT_SYMBOL_GPL(scsi_bus_type);
 563
 564 int scsi_sysfs_register(void)
 565 {
 566         int error;
 567
 568         error = bus_register(&scsi_bus_type);
 569         if (!error) {
 570                 error = class_register(&sdev_class);
 571                 if (error)
 572                         bus_unregister(&scsi_bus_type);
 573         }
 574
 575         return error;
 576 }
 577
 578 void scsi_sysfs_unregister(void)
 579 {
 580         class_unregister(&sdev_class);
 581         bus_unregister(&scsi_bus_type);
 582 }
 583
 584 /*
 585  * sdev_show_function: macro to create an attr function that can be used to
 586  * show a non-bit field.
 587  */
 588 #define sdev_show_function(field, format_string)                                \
 589 static ssize_t                                                          \
 590 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 591                    char *buf)                                           \
 592 {                                                                       \
 593         struct scsi_device *sdev;                                       \
 594         sdev = to_scsi_device(dev);                                     \
 595         return snprintf (buf, 20, format_string, sdev->field);          \
 596 }                                                                       \
 597
 598 /*
 599  * sdev_rd_attr: macro to create a function and attribute variable for a
 600  * read only field.
 601  */
 602 #define sdev_rd_attr(field, format_string)                              \
 603         sdev_show_function(field, format_string)                        \
 604 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 605
 606
 607 /*
 608  * sdev_rw_attr: create a function and attribute variable for a
 609  * read/write field.
 610  */
 611 #define sdev_rw_attr(field, format_string)                              \
 612         sdev_show_function(field, format_string)                                \
 613                                                                         \
 614 static ssize_t                                                          \
 615 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 616                     const char *buf, size_t count)                      \
 617 {                                                                       \
 618         struct scsi_device *sdev;                                       \
 619         sdev = to_scsi_device(dev);                                     \
 620         sscanf (buf, format_string, &sdev->field);                      \
 621         return count;                                                   \
 622 }                                                                       \
 623 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 624
 625 /* Currently we don't export bit fields, but we might in future,
 626  * so leave this code in */
 627 #if 0
 628 /*
 629  * sdev_rd_attr: create a function and attribute variable for a
 630  * read/write bit field.
 631  */
 632 #define sdev_rw_attr_bit(field)                                         \
 633         sdev_show_function(field, "%d\n")                                       \
 634                                                                         \
 635 static ssize_t                                                          \
 636 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 637                     const char *buf, size_t count)                      \
 638 {                                                                       \
 639         int ret;                                                        \
 640         struct scsi_device *sdev;                                       \
 641         ret = scsi_sdev_check_buf_bit(buf);                             \
 642         if (ret >= 0)   {                                               \
 643                 sdev = to_scsi_device(dev);                             \
 644                 sdev->field = ret;                                      \
 645                 ret = count;                                            \
 646         }                                                               \
 647         return ret;                                                     \
 648 }                                                                       \
 649 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 650
 651 /*
 652  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 653  * else return -EINVAL.
 654  */
 655 static int scsi_sdev_check_buf_bit(const char *buf)
 656 {
 657         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 658                 if (buf[0] == '1')
 659                         return 1;
 660                 else if (buf[0] == '0')
 661                         return 0;
 662                 else
 663                         return -EINVAL;
 664         } else
 665                 return -EINVAL;
 666 }
 667 #endif
 668 /*
 669  * Create the actual show/store functions and data structures.
 670  */
 671 sdev_rd_attr (type, "%d\n");
 672 sdev_rd_attr (scsi_level, "%d\n");
 673 sdev_rd_attr (vendor, "%.8s\n");
 674 sdev_rd_attr (model, "%.16s\n");
 675 sdev_rd_attr (rev, "%.4s\n");
 676
 677 static ssize_t
 678 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 679                 char *buf)
 680 {
 681         struct scsi_device *sdev = to_scsi_device(dev);
 682         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
 683 }
 684 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 685
 686 static ssize_t
 687 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 688                 char *buf)
 689 {
 690         struct scsi_device *sdev = to_scsi_device(dev);
 691         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 692 }
 693 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 694
 695 /*
 696  * TODO: can we make these symlinks to the block layer ones?
 697  */
 698 static ssize_t
 699 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 700 {
 701         struct scsi_device *sdev;
 702         sdev = to_scsi_device(dev);
 703         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 704 }
 705
 706 static ssize_t
 707 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 708                     const char *buf, size_t count)
 709 {
 710         struct scsi_device *sdev;
 711         int timeout;
 712         sdev = to_scsi_device(dev);
 713         sscanf (buf, "%d\n", &timeout);
 714         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 715         return count;
 716 }
 717 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 718
 719 static ssize_t
 720 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 721 {
 722         struct scsi_device *sdev;
 723         sdev = to_scsi_device(dev);
 724         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 725 }
 726
 727 static ssize_t
 728 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 729                     const char *buf, size_t count)
 730 {
 731         struct scsi_device *sdev;
 732         unsigned int eh_timeout;
 733         int err;
 734
 735         if (!capable(CAP_SYS_ADMIN))
 736                 return -EACCES;
 737
 738         sdev = to_scsi_device(dev);
 739         err = kstrtouint(buf, 10, &eh_timeout);
 740         if (err)
 741                 return err;
 742         sdev->eh_timeout = eh_timeout * HZ;
 743
 744         return count;
 745 }
 746 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 747
 748 static ssize_t
 749 store_rescan_field (struct device *dev, struct device_attribute *attr,
 750                     const char *buf, size_t count)
 751 {
 752         scsi_rescan_device(dev);
 753         return count;
 754 }
 755 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 756
 757 static ssize_t
 758 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 759                   const char *buf, size_t count)
 760 {
 761         struct kernfs_node *kn;
 762         struct scsi_device *sdev = to_scsi_device(dev);
 763
 764         /*
 765          * We need to try to get module, avoiding the module been removed
 766          * during delete.
 767          */
 768         if (scsi_device_get(sdev))
 769                 return -ENODEV;
 770
 771         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 772         WARN_ON_ONCE(!kn);
 773         /*
 774          * Concurrent writes into the "delete" sysfs attribute may trigger
 775          * concurrent calls to device_remove_file() and scsi_remove_device().
 776          * device_remove_file() handles concurrent removal calls by
 777          * serializing these and by ignoring the second and later removal
 778          * attempts.  Concurrent calls of scsi_remove_device() are
 779          * serialized. The second and later calls of scsi_remove_device() are
 780          * ignored because the first call of that function changes the device
 781          * state into SDEV_DEL.
 782          */
 783         device_remove_file(dev, attr);
 784         scsi_remove_device(sdev);
 785         if (kn)
 786                 sysfs_unbreak_active_protection(kn);
 787         scsi_device_put(sdev);
 788         return count;
 789 };
 790 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 791
 792 static ssize_t
 793 store_state_field(struct device *dev, struct device_attribute *attr,
 794                   const char *buf, size_t count)
 795 {
 796         int i, ret;
 797         struct scsi_device *sdev = to_scsi_device(dev);
 798         enum scsi_device_state state = 0;
 799         bool rescan_dev = false;
 800
 801         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 802                 const int len = strlen(sdev_states[i].name);
 803                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 804                    buf[len] == '\n') {
 805                         state = sdev_states[i].value;
 806                         break;
 807                 }
 808         }
 809         switch (state) {
 810         case SDEV_RUNNING:
 811         case SDEV_OFFLINE:
 812                 break;
 813         default:
 814                 return -EINVAL;
 815         }
 816
 817         mutex_lock(&sdev->state_mutex);
 818         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
 819                 ret = 0;
 820         } else {
 821                 ret = scsi_device_set_state(sdev, state);
 822                 if (ret == 0 && state == SDEV_RUNNING)
 823                         rescan_dev = true;
 824         }
 825         mutex_unlock(&sdev->state_mutex);
 826
 827         if (rescan_dev) {
 828                 /*
 829                  * If the device state changes to SDEV_RUNNING, we need to
 830                  * run the queue to avoid I/O hang, and rescan the device
 831                  * to revalidate it. Running the queue first is necessary
 832                  * because another thread may be waiting inside
 833                  * blk_mq_freeze_queue_wait() and because that call may be
 834                  * waiting for pending I/O to finish.
 835                  */
 836                 blk_mq_run_hw_queues(sdev->request_queue, true);
 837                 scsi_rescan_device(dev);
 838         }
 839
 840         return ret == 0 ? count : -EINVAL;
 841 }
 842
 843 static ssize_t
 844 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 845 {
 846         struct scsi_device *sdev = to_scsi_device(dev);
 847         const char *name = scsi_device_state_name(sdev->sdev_state);
 848
 849         if (!name)
 850                 return -EINVAL;
 851
 852         return snprintf(buf, 20, "%s\n", name);
 853 }
 854
 855 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 856
 857 static ssize_t
 858 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 859                       char *buf)
 860 {
 861         struct scsi_device *sdev = to_scsi_device(dev);
 862         const char *name = "none";
 863
 864         if (sdev->simple_tags)
 865                 name = "simple";
 866
 867         return snprintf(buf, 20, "%s\n", name);
 868 }
 869
 870 static ssize_t
 871 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 872                        const char *buf, size_t count)
 873 {
 874         struct scsi_device *sdev = to_scsi_device(dev);
 875
 876         if (!sdev->tagged_supported)
 877                 return -EINVAL;
 878
 879         sdev_printk(KERN_INFO, sdev,
 880                     "ignoring write to deprecated queue_type attribute");
 881         return count;
 882 }
 883
 884 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 885                    store_queue_type_field);
 886
 887 #define sdev_vpd_pg_attr(_page)                                         \
 888 static ssize_t                                                  \
 889 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 890                  struct bin_attribute *bin_attr,                        \
 891                  char *buf, loff_t off, size_t count)                   \
 892 {                                                                       \
 893         struct device *dev = kobj_to_dev(kobj);                         \
 894         struct scsi_device *sdev = to_scsi_device(dev);                 \
 895         struct scsi_vpd *vpd_page;                                      \
 896         int ret = -EINVAL;                                              \
 897                                                                         \
 898         rcu_read_lock();                                                \
 899         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 900         if (vpd_page)                                                   \
 901                 ret = memory_read_from_buffer(buf, count, &off,         \
 902                                 vpd_page->data, vpd_page->len);         \
 903         rcu_read_unlock();                                              \
 904         return ret;                                                     \
 905 }                                                                       \
 906 static struct bin_attribute dev_attr_vpd_##_page = {            \
 907         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 908         .size = 0,                                                      \
 909         .read = show_vpd_##_page,                                       \
 910 };
 911
 912 sdev_vpd_pg_attr(pg83);
 913 sdev_vpd_pg_attr(pg80);
 914 sdev_vpd_pg_attr(pg89);
 915 sdev_vpd_pg_attr(pg0);
 916
 917 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 918                             struct bin_attribute *bin_attr,
 919                             char *buf, loff_t off, size_t count)
 920 {
 921         struct device *dev = kobj_to_dev(kobj);
 922         struct scsi_device *sdev = to_scsi_device(dev);
 923
 924         if (!sdev->inquiry)
 925                 return -EINVAL;
 926
 927         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 928                                        sdev->inquiry_len);
 929 }
 930
 931 static struct bin_attribute dev_attr_inquiry = {
 932         .attr = {
 933                 .name = "inquiry",
 934                 .mode = S_IRUGO,
 935         },
 936         .size = 0,
 937         .read = show_inquiry,
 938 };
 939
 940 static ssize_t
 941 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 942                         char *buf)
 943 {
 944         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 945 }
 946
 947 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 948
 949 #define show_sdev_iostat(field)                                         \
 950 static ssize_t                                                          \
 951 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 952                     char *buf)                                          \
 953 {                                                                       \
 954         struct scsi_device *sdev = to_scsi_device(dev);                 \
 955         unsigned long long count = atomic_read(&sdev->field);           \
 956         return snprintf(buf, 20, "0x%llx\n", count);                    \
 957 }                                                                       \
 958 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 959
 960 show_sdev_iostat(iorequest_cnt);
 961 show_sdev_iostat(iodone_cnt);
 962 show_sdev_iostat(ioerr_cnt);
 963
 964 static ssize_t
 965 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 966 {
 967         struct scsi_device *sdev;
 968         sdev = to_scsi_device(dev);
 969         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 970 }
 971 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 972
 973 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 974 static ssize_t                                                          \
 975 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 976                      char *buf)                                         \
 977 {                                                                       \
 978         struct scsi_device *sdev = to_scsi_device(dev);                 \
 979         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 980         return snprintf(buf, 20, "%d\n", val);                          \
 981 }
 982
 983 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 984 static ssize_t                                                          \
 985 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 986                       const char *buf, size_t count)                    \
 987 {                                                                       \
 988         struct scsi_device *sdev = to_scsi_device(dev);                 \
 989         int val = simple_strtoul(buf, NULL, 0);                         \
 990         if (val == 0)                                                   \
 991                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 992         else if (val == 1)                                              \
 993                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 994         else                                                            \
 995                 return -EINVAL;                                         \
 996         return count;                                                   \
 997 }
 998
 999 #define DECLARE_EVT(name, Cap_name)                                     \
1000         DECLARE_EVT_SHOW(name, Cap_name)                                \
1001         DECLARE_EVT_STORE(name, Cap_name)                               \
1002         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
1003                            sdev_store_evt_##name);
1004 #define REF_EVT(name) &dev_attr_evt_##name.attr
1005
1006 DECLARE_EVT(media_change, MEDIA_CHANGE)
1007 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1008 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1009 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1010 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1011 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1012
1013 static ssize_t
1014 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1015                        const char *buf, size_t count)
1016 {
1017         int depth, retval;
1018         struct scsi_device *sdev = to_scsi_device(dev);
1019         struct scsi_host_template *sht = sdev->host->hostt;
1020
1021         if (!sht->change_queue_depth)
1022                 return -EINVAL;
1023
1024         depth = simple_strtoul(buf, NULL, 0);
1025
1026         if (depth < 1 || depth > sdev->host->can_queue)
1027                 return -EINVAL;
1028
1029         retval = sht->change_queue_depth(sdev, depth);
1030         if (retval < 0)
1031                 return retval;
1032
1033         sdev->max_queue_depth = sdev->queue_depth;
1034
1035         return count;
1036 }
1037 sdev_show_function(queue_depth, "%d\n");
1038
1039 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1040                    sdev_store_queue_depth);
1041
1042 static ssize_t
1043 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1044                     char *buf)
1045 {
1046         struct scsi_device *sdev = to_scsi_device(dev);
1047         ssize_t count;
1048
1049         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1050         if (count > 0) {
1051                 buf[count] = '\n';
1052                 count++;
1053         }
1054         return count;
1055 }
1056 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1057
1058 #define BLIST_FLAG_NAME(name)                                   \
1059         [const_ilog2((__force __u64)BLIST_##name)] = #name
1060 static const char *const sdev_bflags_name[] = {
1061 #include "scsi_devinfo_tbl.c"
1062 };
1063 #undef BLIST_FLAG_NAME
1064
1065 static ssize_t
1066 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1067                     char *buf)
1068 {
1069         struct scsi_device *sdev = to_scsi_device(dev);
1070         int i;
1071         ssize_t len = 0;
1072
1073         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1074                 const char *name = NULL;
1075
1076                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1077                         continue;
1078                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1079                         name = sdev_bflags_name[i];
1080
1081                 if (name)
1082                         len += scnprintf(buf + len, PAGE_SIZE - len,
1083                                          "%s%s", len ? " " : "", name);
1084                 else
1085                         len += scnprintf(buf + len, PAGE_SIZE - len,
1086                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1087         }
1088         if (len)
1089                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1090         return len;
1091 }
1092 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1093
1094 #ifdef CONFIG_SCSI_DH
1095 static ssize_t
1096 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1097                    char *buf)
1098 {
1099         struct scsi_device *sdev = to_scsi_device(dev);
1100
1101         if (!sdev->handler)
1102                 return snprintf(buf, 20, "detached\n");
1103
1104         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1105 }
1106
1107 static ssize_t
1108 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1109                     const char *buf, size_t count)
1110 {
1111         struct scsi_device *sdev = to_scsi_device(dev);
1112         int err = -EINVAL;
1113
1114         if (sdev->sdev_state == SDEV_CANCEL ||
1115             sdev->sdev_state == SDEV_DEL)
1116                 return -ENODEV;
1117
1118         if (!sdev->handler) {
1119                 /*
1120                  * Attach to a device handler
1121                  */
1122                 err = scsi_dh_attach(sdev->request_queue, buf);
1123         } else if (!strncmp(buf, "activate", 8)) {
1124                 /*
1125                  * Activate a device handler
1126                  */
1127                 if (sdev->handler->activate)
1128                         err = sdev->handler->activate(sdev, NULL, NULL);
1129                 else
1130                         err = 0;
1131         } else if (!strncmp(buf, "detach", 6)) {
1132                 /*
1133                  * Detach from a device handler
1134                  */
1135                 sdev_printk(KERN_WARNING, sdev,
1136                             "can't detach handler %s.\n",
1137                             sdev->handler->name);
1138                 err = -EINVAL;
1139         }
1140
1141         return err < 0 ? err : count;
1142 }
1143
1144 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1145                    sdev_store_dh_state);
1146
1147 static ssize_t
1148 sdev_show_access_state(struct device *dev,
1149                        struct device_attribute *attr,
1150                        char *buf)
1151 {
1152         struct scsi_device *sdev = to_scsi_device(dev);
1153         unsigned char access_state;
1154         const char *access_state_name;
1155
1156         if (!sdev->handler)
1157                 return -EINVAL;
1158
1159         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1160         access_state_name = scsi_access_state_name(access_state);
1161
1162         return sprintf(buf, "%s\n",
1163                        access_state_name ? access_state_name : "unknown");
1164 }
1165 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1166
1167 static ssize_t
1168 sdev_show_preferred_path(struct device *dev,
1169                          struct device_attribute *attr,
1170                          char *buf)
1171 {
1172         struct scsi_device *sdev = to_scsi_device(dev);
1173
1174         if (!sdev->handler)
1175                 return -EINVAL;
1176
1177         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1178                 return sprintf(buf, "1\n");
1179         else
1180                 return sprintf(buf, "0\n");
1181 }
1182 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1183 #endif
1184
1185 static ssize_t
1186 sdev_show_queue_ramp_up_period(struct device *dev,
1187                                struct device_attribute *attr,
1188                                char *buf)
1189 {
1190         struct scsi_device *sdev;
1191         sdev = to_scsi_device(dev);
1192         return snprintf(buf, 20, "%u\n",
1193                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1194 }
1195
1196 static ssize_t
1197 sdev_store_queue_ramp_up_period(struct device *dev,
1198                                 struct device_attribute *attr,
1199                                 const char *buf, size_t count)
1200 {
1201         struct scsi_device *sdev = to_scsi_device(dev);
1202         unsigned int period;
1203
1204         if (kstrtouint(buf, 10, &period))
1205                 return -EINVAL;
1206
1207         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1208         return count;
1209 }
1210
1211 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1212                    sdev_show_queue_ramp_up_period,
1213                    sdev_store_queue_ramp_up_period);
1214
1215 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1216                                          struct attribute *attr, int i)
1217 {
1218         struct device *dev = kobj_to_dev(kobj);
1219         struct scsi_device *sdev = to_scsi_device(dev);
1220
1221
1222         if (attr == &dev_attr_queue_depth.attr &&
1223             !sdev->host->hostt->change_queue_depth)
1224                 return S_IRUGO;
1225
1226         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1227             !sdev->host->hostt->change_queue_depth)
1228                 return 0;
1229
1230 #ifdef CONFIG_SCSI_DH
1231         if (attr == &dev_attr_access_state.attr &&
1232             !sdev->handler)
1233                 return 0;
1234         if (attr == &dev_attr_preferred_path.attr &&
1235             !sdev->handler)
1236                 return 0;
1237 #endif
1238         return attr->mode;
1239 }
1240
1241 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1242                                              struct bin_attribute *attr, int i)
1243 {
1244         struct device *dev = kobj_to_dev(kobj);
1245         struct scsi_device *sdev = to_scsi_device(dev);
1246
1247
1248         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1249                 return 0;
1250
1251         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1252                 return 0;
1253
1254         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1255                 return 0;
1256
1257         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1258                 return 0;
1259
1260         return S_IRUGO;
1261 }
1262
1263 /* Default template for device attributes.  May NOT be modified */
1264 static struct attribute *scsi_sdev_attrs[] = {
1265         &dev_attr_device_blocked.attr,
1266         &dev_attr_type.attr,
1267         &dev_attr_scsi_level.attr,
1268         &dev_attr_device_busy.attr,
1269         &dev_attr_vendor.attr,
1270         &dev_attr_model.attr,
1271         &dev_attr_rev.attr,
1272         &dev_attr_rescan.attr,
1273         &dev_attr_delete.attr,
1274         &dev_attr_state.attr,
1275         &dev_attr_timeout.attr,
1276         &dev_attr_eh_timeout.attr,
1277         &dev_attr_iocounterbits.attr,
1278         &dev_attr_iorequest_cnt.attr,
1279         &dev_attr_iodone_cnt.attr,
1280         &dev_attr_ioerr_cnt.attr,
1281         &dev_attr_modalias.attr,
1282         &dev_attr_queue_depth.attr,
1283         &dev_attr_queue_type.attr,
1284         &dev_attr_wwid.attr,
1285         &dev_attr_blacklist.attr,
1286 #ifdef CONFIG_SCSI_DH
1287         &dev_attr_dh_state.attr,
1288         &dev_attr_access_state.attr,
1289         &dev_attr_preferred_path.attr,
1290 #endif
1291         &dev_attr_queue_ramp_up_period.attr,
1292         REF_EVT(media_change),
1293         REF_EVT(inquiry_change_reported),
1294         REF_EVT(capacity_change_reported),
1295         REF_EVT(soft_threshold_reached),
1296         REF_EVT(mode_parameter_change_reported),
1297         REF_EVT(lun_change_reported),
1298         NULL
1299 };
1300
1301 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1302         &dev_attr_vpd_pg0,
1303         &dev_attr_vpd_pg83,
1304         &dev_attr_vpd_pg80,
1305         &dev_attr_vpd_pg89,
1306         &dev_attr_inquiry,
1307         NULL
1308 };
1309 static struct attribute_group scsi_sdev_attr_group = {
1310         .attrs =        scsi_sdev_attrs,
1311         .bin_attrs =    scsi_sdev_bin_attrs,
1312         .is_visible =   scsi_sdev_attr_is_visible,
1313         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1314 };
1315
1316 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1317         &scsi_sdev_attr_group,
1318         NULL
1319 };
1320
1321 static int scsi_target_add(struct scsi_target *starget)
1322 {
1323         int error;
1324
1325         if (starget->state != STARGET_CREATED)
1326                 return 0;
1327
1328         error = device_add(&starget->dev);
1329         if (error) {
1330                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1331                 return error;
1332         }
1333         transport_add_device(&starget->dev);
1334         starget->state = STARGET_RUNNING;
1335
1336         pm_runtime_set_active(&starget->dev);
1337         pm_runtime_enable(&starget->dev);
1338         device_enable_async_suspend(&starget->dev);
1339
1340         return 0;
1341 }
1342
1343 /**
1344  * scsi_sysfs_add_sdev - add scsi device to sysfs
1345  * @sdev:       scsi_device to add
1346  *
1347  * Return value:
1348  *      0 on Success / non-zero on Failure
1349  **/
1350 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1351 {
1352         int error, i;
1353         struct request_queue *rq = sdev->request_queue;
1354         struct scsi_target *starget = sdev->sdev_target;
1355
1356         error = scsi_target_add(starget);
1357         if (error)
1358                 return error;
1359
1360         transport_configure_device(&starget->dev);
1361
1362         device_enable_async_suspend(&sdev->sdev_gendev);
1363         scsi_autopm_get_target(starget);
1364         pm_runtime_set_active(&sdev->sdev_gendev);
1365         if (!sdev->rpm_autosuspend)
1366                 pm_runtime_forbid(&sdev->sdev_gendev);
1367         pm_runtime_enable(&sdev->sdev_gendev);
1368         scsi_autopm_put_target(starget);
1369
1370         scsi_autopm_get_device(sdev);
1371
1372         scsi_dh_add_device(sdev);
1373
1374         error = device_add(&sdev->sdev_gendev);
1375         if (error) {
1376                 sdev_printk(KERN_INFO, sdev,
1377                                 "failed to add device: %d\n", error);
1378                 return error;
1379         }
1380
1381         device_enable_async_suspend(&sdev->sdev_dev);
1382         error = device_add(&sdev->sdev_dev);
1383         if (error) {
1384                 sdev_printk(KERN_INFO, sdev,
1385                                 "failed to add class device: %d\n", error);
1386                 device_del(&sdev->sdev_gendev);
1387                 return error;
1388         }
1389         transport_add_device(&sdev->sdev_gendev);
1390         sdev->is_visible = 1;
1391
1392         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1393         if (error)
1394                 /* we're treating error on bsg register as non-fatal,
1395                  * so pretend nothing went wrong */
1396                 sdev_printk(KERN_INFO, sdev,
1397                             "Failed to register bsg queue, errno=%d\n", error);
1398
1399         /* add additional host specific attributes */
1400         if (sdev->host->hostt->sdev_attrs) {
1401                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1402                         error = device_create_file(&sdev->sdev_gendev,
1403                                         sdev->host->hostt->sdev_attrs[i]);
1404                         if (error)
1405                                 return error;
1406                 }
1407         }
1408
1409         if (sdev->host->hostt->sdev_groups) {
1410                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1411                                 sdev->host->hostt->sdev_groups);
1412                 if (error)
1413                         return error;
1414         }
1415
1416         scsi_autopm_put_device(sdev);
1417         return error;
1418 }
1419
1420 void __scsi_remove_device(struct scsi_device *sdev)
1421 {
1422         struct device *dev = &sdev->sdev_gendev;
1423         int res;
1424
1425         /*
1426          * This cleanup path is not reentrant and while it is impossible
1427          * to get a new reference with scsi_device_get() someone can still
1428          * hold a previously acquired one.
1429          */
1430         if (sdev->sdev_state == SDEV_DEL)
1431                 return;
1432
1433         if (sdev->is_visible) {
1434                 /*
1435                  * If scsi_internal_target_block() is running concurrently,
1436                  * wait until it has finished before changing the device state.
1437                  */
1438                 mutex_lock(&sdev->state_mutex);
1439                 /*
1440                  * If blocked, we go straight to DEL and restart the queue so
1441                  * any commands issued during driver shutdown (like sync
1442                  * cache) are errored immediately.
1443                  */
1444                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1445                 if (res != 0) {
1446                         res = scsi_device_set_state(sdev, SDEV_DEL);
1447                         if (res == 0)
1448                                 scsi_start_queue(sdev);
1449                 }
1450                 mutex_unlock(&sdev->state_mutex);
1451
1452                 if (res != 0)
1453                         return;
1454
1455                 if (sdev->host->hostt->sdev_groups)
1456                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1457                                         sdev->host->hostt->sdev_groups);
1458
1459                 bsg_unregister_queue(sdev->request_queue);
1460                 device_unregister(&sdev->sdev_dev);
1461                 transport_remove_device(dev);
1462                 device_del(dev);
1463         } else
1464                 put_device(&sdev->sdev_dev);
1465
1466         /*
1467          * Stop accepting new requests and wait until all queuecommand() and
1468          * scsi_run_queue() invocations have finished before tearing down the
1469          * device.
1470          */
1471         mutex_lock(&sdev->state_mutex);
1472         scsi_device_set_state(sdev, SDEV_DEL);
1473         mutex_unlock(&sdev->state_mutex);
1474
1475         blk_cleanup_queue(sdev->request_queue);
1476         cancel_work_sync(&sdev->requeue_work);
1477
1478         if (sdev->host->hostt->slave_destroy)
1479                 sdev->host->hostt->slave_destroy(sdev);
1480         transport_destroy_device(dev);
1481
1482         /*
1483          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1484          * remoed sysfs visibility from the device, so make the target
1485          * invisible if this was the last device underneath it.
1486          */
1487         scsi_target_reap(scsi_target(sdev));
1488
1489         put_device(dev);
1490 }
1491
1492 /**
1493  * scsi_remove_device - unregister a device from the scsi bus
1494  * @sdev:       scsi_device to unregister
1495  **/
1496 void scsi_remove_device(struct scsi_device *sdev)
1497 {
1498         struct Scsi_Host *shost = sdev->host;
1499
1500         mutex_lock(&shost->scan_mutex);
1501         __scsi_remove_device(sdev);
1502         mutex_unlock(&shost->scan_mutex);
1503 }
1504 EXPORT_SYMBOL(scsi_remove_device);
1505
1506 static void __scsi_remove_target(struct scsi_target *starget)
1507 {
1508         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1509         unsigned long flags;
1510         struct scsi_device *sdev;
1511
1512         spin_lock_irqsave(shost->host_lock, flags);
1513  restart:
1514         list_for_each_entry(sdev, &shost->__devices, siblings) {
1515                 /*
1516                  * We cannot call scsi_device_get() here, as
1517                  * we might've been called from rmmod() causing
1518                  * scsi_device_get() to fail the module_is_live()
1519                  * check.
1520                  */
1521                 if (sdev->channel != starget->channel ||
1522                     sdev->id != starget->id)
1523                         continue;
1524                 if (sdev->sdev_state == SDEV_DEL ||
1525                     sdev->sdev_state == SDEV_CANCEL ||
1526                     !get_device(&sdev->sdev_gendev))
1527                         continue;
1528                 spin_unlock_irqrestore(shost->host_lock, flags);
1529                 scsi_remove_device(sdev);
1530                 put_device(&sdev->sdev_gendev);
1531                 spin_lock_irqsave(shost->host_lock, flags);
1532                 goto restart;
1533         }
1534         spin_unlock_irqrestore(shost->host_lock, flags);
1535 }
1536
1537 /**
1538  * scsi_remove_target - try to remove a target and all its devices
1539  * @dev: generic starget or parent of generic stargets to be removed
1540  *
1541  * Note: This is slightly racy.  It is possible that if the user
1542  * requests the addition of another device then the target won't be
1543  * removed.
1544  */
1545 void scsi_remove_target(struct device *dev)
1546 {
1547         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1548         struct scsi_target *starget;
1549         unsigned long flags;
1550
1551 restart:
1552         spin_lock_irqsave(shost->host_lock, flags);
1553         list_for_each_entry(starget, &shost->__targets, siblings) {
1554                 if (starget->state == STARGET_DEL ||
1555                     starget->state == STARGET_REMOVE ||
1556                     starget->state == STARGET_CREATED_REMOVE)
1557                         continue;
1558                 if (starget->dev.parent == dev || &starget->dev == dev) {
1559                         kref_get(&starget->reap_ref);
1560                         if (starget->state == STARGET_CREATED)
1561                                 starget->state = STARGET_CREATED_REMOVE;
1562                         else
1563                                 starget->state = STARGET_REMOVE;
1564                         spin_unlock_irqrestore(shost->host_lock, flags);
1565                         __scsi_remove_target(starget);
1566                         scsi_target_reap(starget);
1567                         goto restart;
1568                 }
1569         }
1570         spin_unlock_irqrestore(shost->host_lock, flags);
1571 }
1572 EXPORT_SYMBOL(scsi_remove_target);
1573
1574 int scsi_register_driver(struct device_driver *drv)
1575 {
1576         drv->bus = &scsi_bus_type;
1577
1578         return driver_register(drv);
1579 }
1580 EXPORT_SYMBOL(scsi_register_driver);
1581
1582 int scsi_register_interface(struct class_interface *intf)
1583 {
1584         intf->class = &sdev_class;
1585
1586         return class_interface_register(intf);
1587 }
1588 EXPORT_SYMBOL(scsi_register_interface);
1589
1590 /**
1591  * scsi_sysfs_add_host - add scsi host to subsystem
1592  * @shost:     scsi host struct to add to subsystem
1593  **/
1594 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1595 {
1596         int error, i;
1597
1598         /* add host specific attributes */
1599         if (shost->hostt->shost_attrs) {
1600                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1601                         error = device_create_file(&shost->shost_dev,
1602                                         shost->hostt->shost_attrs[i]);
1603                         if (error)
1604                                 return error;
1605                 }
1606         }
1607
1608         transport_register_device(&shost->shost_gendev);
1609         transport_configure_device(&shost->shost_gendev);
1610         return 0;
1611 }
1612
1613 static struct device_type scsi_dev_type = {
1614         .name =         "scsi_device",
1615         .release =      scsi_device_dev_release,
1616         .groups =       scsi_sdev_attr_groups,
1617 };
1618
1619 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1620 {
1621         unsigned long flags;
1622         struct Scsi_Host *shost = sdev->host;
1623         struct scsi_target  *starget = sdev->sdev_target;
1624
1625         device_initialize(&sdev->sdev_gendev);
1626         sdev->sdev_gendev.bus = &scsi_bus_type;
1627         sdev->sdev_gendev.type = &scsi_dev_type;
1628         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1629                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1630
1631         device_initialize(&sdev->sdev_dev);
1632         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1633         sdev->sdev_dev.class = &sdev_class;
1634         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1635                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1636         /*
1637          * Get a default scsi_level from the target (derived from sibling
1638          * devices).  This is the best we can do for guessing how to set
1639          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1640          * setting doesn't matter, because all the bits are zero anyway.
1641          * But it does matter for higher LUNs.
1642          */
1643         sdev->scsi_level = starget->scsi_level;
1644         if (sdev->scsi_level <= SCSI_2 &&
1645                         sdev->scsi_level != SCSI_UNKNOWN &&
1646                         !shost->no_scsi2_lun_in_cdb)
1647                 sdev->lun_in_cdb = 1;
1648
1649         transport_setup_device(&sdev->sdev_gendev);
1650         spin_lock_irqsave(shost->host_lock, flags);
1651         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1652         list_add_tail(&sdev->siblings, &shost->__devices);
1653         spin_unlock_irqrestore(shost->host_lock, flags);
1654         /*
1655          * device can now only be removed via __scsi_remove_device() so hold
1656          * the target.  Target will be held in CREATED state until something
1657          * beneath it becomes visible (in which case it moves to RUNNING)
1658          */
1659         kref_get(&starget->reap_ref);
1660 }
1661
1662 int scsi_is_sdev_device(const struct device *dev)
1663 {
1664         return dev->type == &scsi_dev_type;
1665 }
1666 EXPORT_SYMBOL(scsi_is_sdev_device);
1667
1668 /* A blank transport template that is used in drivers that don't
1669  * yet implement Transport Attributes */
1670 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };