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