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 const struct attribute_group scsi_shost_attr_group = {
 428         .attrs =        scsi_sysfs_shost_attrs,
 429 };
 430
 431 const struct attribute_group *scsi_shost_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         struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = 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         sbitmap_free(&sdev->budget_map);
 484
 485         mutex_lock(&sdev->inquiry_mutex);
 486         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 487                                        lockdep_is_held(&sdev->inquiry_mutex));
 488         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 489                                        lockdep_is_held(&sdev->inquiry_mutex));
 490         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 491                                        lockdep_is_held(&sdev->inquiry_mutex));
 492         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 493                                        lockdep_is_held(&sdev->inquiry_mutex));
 494         vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
 495                                        lockdep_is_held(&sdev->inquiry_mutex));
 496         vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
 497                                        lockdep_is_held(&sdev->inquiry_mutex));
 498         vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
 499                                        lockdep_is_held(&sdev->inquiry_mutex));
 500         mutex_unlock(&sdev->inquiry_mutex);
 501
 502         if (vpd_pg0)
 503                 kfree_rcu(vpd_pg0, rcu);
 504         if (vpd_pg83)
 505                 kfree_rcu(vpd_pg83, rcu);
 506         if (vpd_pg80)
 507                 kfree_rcu(vpd_pg80, rcu);
 508         if (vpd_pg89)
 509                 kfree_rcu(vpd_pg89, rcu);
 510         if (vpd_pgb0)
 511                 kfree_rcu(vpd_pgb0, rcu);
 512         if (vpd_pgb1)
 513                 kfree_rcu(vpd_pgb1, rcu);
 514         if (vpd_pgb2)
 515                 kfree_rcu(vpd_pgb2, rcu);
 516         kfree(sdev->inquiry);
 517         kfree(sdev);
 518
 519         if (parent)
 520                 put_device(parent);
 521         module_put(mod);
 522 }
 523
 524 static void scsi_device_dev_release(struct device *dev)
 525 {
 526         struct scsi_device *sdp = to_scsi_device(dev);
 527
 528         /* Set module pointer as NULL in case of module unloading */
 529         if (!try_module_get(sdp->host->hostt->module))
 530                 sdp->host->hostt->module = NULL;
 531
 532         execute_in_process_context(scsi_device_dev_release_usercontext,
 533                                    &sdp->ew);
 534 }
 535
 536 static struct class sdev_class = {
 537         .name           = "scsi_device",
 538         .dev_release    = scsi_device_cls_release,
 539 };
 540
 541 /* all probing is done in the individual ->probe routines */
 542 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 543 {
 544         struct scsi_device *sdp;
 545
 546         if (dev->type != &scsi_dev_type)
 547                 return 0;
 548
 549         sdp = to_scsi_device(dev);
 550         if (sdp->no_uld_attach)
 551                 return 0;
 552         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 553 }
 554
 555 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 556 {
 557         struct scsi_device *sdev;
 558
 559         if (dev->type != &scsi_dev_type)
 560                 return 0;
 561
 562         sdev = to_scsi_device(dev);
 563
 564         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 565         return 0;
 566 }
 567
 568 struct bus_type scsi_bus_type = {
 569         .name           = "scsi",
 570         .match          = scsi_bus_match,
 571         .uevent         = scsi_bus_uevent,
 572 #ifdef CONFIG_PM
 573         .pm             = &scsi_bus_pm_ops,
 574 #endif
 575 };
 576
 577 int scsi_sysfs_register(void)
 578 {
 579         int error;
 580
 581         error = bus_register(&scsi_bus_type);
 582         if (!error) {
 583                 error = class_register(&sdev_class);
 584                 if (error)
 585                         bus_unregister(&scsi_bus_type);
 586         }
 587
 588         return error;
 589 }
 590
 591 void scsi_sysfs_unregister(void)
 592 {
 593         class_unregister(&sdev_class);
 594         bus_unregister(&scsi_bus_type);
 595 }
 596
 597 /*
 598  * sdev_show_function: macro to create an attr function that can be used to
 599  * show a non-bit field.
 600  */
 601 #define sdev_show_function(field, format_string)                                \
 602 static ssize_t                                                          \
 603 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 604                    char *buf)                                           \
 605 {                                                                       \
 606         struct scsi_device *sdev;                                       \
 607         sdev = to_scsi_device(dev);                                     \
 608         return snprintf (buf, 20, format_string, sdev->field);          \
 609 }                                                                       \
 610
 611 /*
 612  * sdev_rd_attr: macro to create a function and attribute variable for a
 613  * read only field.
 614  */
 615 #define sdev_rd_attr(field, format_string)                              \
 616         sdev_show_function(field, format_string)                        \
 617 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 618
 619
 620 /*
 621  * sdev_rw_attr: create a function and attribute variable for a
 622  * read/write field.
 623  */
 624 #define sdev_rw_attr(field, format_string)                              \
 625         sdev_show_function(field, format_string)                                \
 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         struct scsi_device *sdev;                                       \
 632         sdev = to_scsi_device(dev);                                     \
 633         sscanf (buf, format_string, &sdev->field);                      \
 634         return count;                                                   \
 635 }                                                                       \
 636 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 637
 638 /* Currently we don't export bit fields, but we might in future,
 639  * so leave this code in */
 640 #if 0
 641 /*
 642  * sdev_rd_attr: create a function and attribute variable for a
 643  * read/write bit field.
 644  */
 645 #define sdev_rw_attr_bit(field)                                         \
 646         sdev_show_function(field, "%d\n")                                       \
 647                                                                         \
 648 static ssize_t                                                          \
 649 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 650                     const char *buf, size_t count)                      \
 651 {                                                                       \
 652         int ret;                                                        \
 653         struct scsi_device *sdev;                                       \
 654         ret = scsi_sdev_check_buf_bit(buf);                             \
 655         if (ret >= 0)   {                                               \
 656                 sdev = to_scsi_device(dev);                             \
 657                 sdev->field = ret;                                      \
 658                 ret = count;                                            \
 659         }                                                               \
 660         return ret;                                                     \
 661 }                                                                       \
 662 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 663
 664 /*
 665  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 666  * else return -EINVAL.
 667  */
 668 static int scsi_sdev_check_buf_bit(const char *buf)
 669 {
 670         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 671                 if (buf[0] == '1')
 672                         return 1;
 673                 else if (buf[0] == '0')
 674                         return 0;
 675                 else
 676                         return -EINVAL;
 677         } else
 678                 return -EINVAL;
 679 }
 680 #endif
 681 /*
 682  * Create the actual show/store functions and data structures.
 683  */
 684 sdev_rd_attr (type, "%d\n");
 685 sdev_rd_attr (scsi_level, "%d\n");
 686 sdev_rd_attr (vendor, "%.8s\n");
 687 sdev_rd_attr (model, "%.16s\n");
 688 sdev_rd_attr (rev, "%.4s\n");
 689
 690 static ssize_t
 691 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 692                 char *buf)
 693 {
 694         struct scsi_device *sdev = to_scsi_device(dev);
 695         return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 696 }
 697 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 698
 699 static ssize_t
 700 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 701                 char *buf)
 702 {
 703         struct scsi_device *sdev = to_scsi_device(dev);
 704         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 705 }
 706 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 707
 708 /*
 709  * TODO: can we make these symlinks to the block layer ones?
 710  */
 711 static ssize_t
 712 sdev_show_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, "%d\n", sdev->request_queue->rq_timeout / HZ);
 717 }
 718
 719 static ssize_t
 720 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 721                     const char *buf, size_t count)
 722 {
 723         struct scsi_device *sdev;
 724         int timeout;
 725         sdev = to_scsi_device(dev);
 726         sscanf (buf, "%d\n", &timeout);
 727         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 728         return count;
 729 }
 730 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 731
 732 static ssize_t
 733 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 734 {
 735         struct scsi_device *sdev;
 736         sdev = to_scsi_device(dev);
 737         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 738 }
 739
 740 static ssize_t
 741 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 742                     const char *buf, size_t count)
 743 {
 744         struct scsi_device *sdev;
 745         unsigned int eh_timeout;
 746         int err;
 747
 748         if (!capable(CAP_SYS_ADMIN))
 749                 return -EACCES;
 750
 751         sdev = to_scsi_device(dev);
 752         err = kstrtouint(buf, 10, &eh_timeout);
 753         if (err)
 754                 return err;
 755         sdev->eh_timeout = eh_timeout * HZ;
 756
 757         return count;
 758 }
 759 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 760
 761 static ssize_t
 762 store_rescan_field (struct device *dev, struct device_attribute *attr,
 763                     const char *buf, size_t count)
 764 {
 765         scsi_rescan_device(dev);
 766         return count;
 767 }
 768 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 769
 770 static ssize_t
 771 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 772                   const char *buf, size_t count)
 773 {
 774         struct kernfs_node *kn;
 775         struct scsi_device *sdev = to_scsi_device(dev);
 776
 777         /*
 778          * We need to try to get module, avoiding the module been removed
 779          * during delete.
 780          */
 781         if (scsi_device_get(sdev))
 782                 return -ENODEV;
 783
 784         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 785         WARN_ON_ONCE(!kn);
 786         /*
 787          * Concurrent writes into the "delete" sysfs attribute may trigger
 788          * concurrent calls to device_remove_file() and scsi_remove_device().
 789          * device_remove_file() handles concurrent removal calls by
 790          * serializing these and by ignoring the second and later removal
 791          * attempts.  Concurrent calls of scsi_remove_device() are
 792          * serialized. The second and later calls of scsi_remove_device() are
 793          * ignored because the first call of that function changes the device
 794          * state into SDEV_DEL.
 795          */
 796         device_remove_file(dev, attr);
 797         scsi_remove_device(sdev);
 798         if (kn)
 799                 sysfs_unbreak_active_protection(kn);
 800         scsi_device_put(sdev);
 801         return count;
 802 };
 803 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 804
 805 static ssize_t
 806 store_state_field(struct device *dev, struct device_attribute *attr,
 807                   const char *buf, size_t count)
 808 {
 809         int i, ret;
 810         struct scsi_device *sdev = to_scsi_device(dev);
 811         enum scsi_device_state state = 0;
 812         bool rescan_dev = false;
 813
 814         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 815                 const int len = strlen(sdev_states[i].name);
 816                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 817                    buf[len] == '\n') {
 818                         state = sdev_states[i].value;
 819                         break;
 820                 }
 821         }
 822         switch (state) {
 823         case SDEV_RUNNING:
 824         case SDEV_OFFLINE:
 825                 break;
 826         default:
 827                 return -EINVAL;
 828         }
 829
 830         mutex_lock(&sdev->state_mutex);
 831         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
 832                 ret = 0;
 833         } else {
 834                 ret = scsi_device_set_state(sdev, state);
 835                 if (ret == 0 && state == SDEV_RUNNING)
 836                         rescan_dev = true;
 837         }
 838         mutex_unlock(&sdev->state_mutex);
 839
 840         if (rescan_dev) {
 841                 /*
 842                  * If the device state changes to SDEV_RUNNING, we need to
 843                  * run the queue to avoid I/O hang, and rescan the device
 844                  * to revalidate it. Running the queue first is necessary
 845                  * because another thread may be waiting inside
 846                  * blk_mq_freeze_queue_wait() and because that call may be
 847                  * waiting for pending I/O to finish.
 848                  */
 849                 blk_mq_run_hw_queues(sdev->request_queue, true);
 850                 scsi_rescan_device(dev);
 851         }
 852
 853         return ret == 0 ? count : -EINVAL;
 854 }
 855
 856 static ssize_t
 857 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 858 {
 859         struct scsi_device *sdev = to_scsi_device(dev);
 860         const char *name = scsi_device_state_name(sdev->sdev_state);
 861
 862         if (!name)
 863                 return -EINVAL;
 864
 865         return snprintf(buf, 20, "%s\n", name);
 866 }
 867
 868 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 869
 870 static ssize_t
 871 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 872                       char *buf)
 873 {
 874         struct scsi_device *sdev = to_scsi_device(dev);
 875         const char *name = "none";
 876
 877         if (sdev->simple_tags)
 878                 name = "simple";
 879
 880         return snprintf(buf, 20, "%s\n", name);
 881 }
 882
 883 static ssize_t
 884 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 885                        const char *buf, size_t count)
 886 {
 887         struct scsi_device *sdev = to_scsi_device(dev);
 888
 889         if (!sdev->tagged_supported)
 890                 return -EINVAL;
 891
 892         sdev_printk(KERN_INFO, sdev,
 893                     "ignoring write to deprecated queue_type attribute");
 894         return count;
 895 }
 896
 897 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 898                    store_queue_type_field);
 899
 900 #define sdev_vpd_pg_attr(_page)                                         \
 901 static ssize_t                                                  \
 902 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 903                  struct bin_attribute *bin_attr,                        \
 904                  char *buf, loff_t off, size_t count)                   \
 905 {                                                                       \
 906         struct device *dev = kobj_to_dev(kobj);                         \
 907         struct scsi_device *sdev = to_scsi_device(dev);                 \
 908         struct scsi_vpd *vpd_page;                                      \
 909         int ret = -EINVAL;                                              \
 910                                                                         \
 911         rcu_read_lock();                                                \
 912         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 913         if (vpd_page)                                                   \
 914                 ret = memory_read_from_buffer(buf, count, &off,         \
 915                                 vpd_page->data, vpd_page->len);         \
 916         rcu_read_unlock();                                              \
 917         return ret;                                                     \
 918 }                                                                       \
 919 static struct bin_attribute dev_attr_vpd_##_page = {            \
 920         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 921         .size = 0,                                                      \
 922         .read = show_vpd_##_page,                                       \
 923 };
 924
 925 sdev_vpd_pg_attr(pg83);
 926 sdev_vpd_pg_attr(pg80);
 927 sdev_vpd_pg_attr(pg89);
 928 sdev_vpd_pg_attr(pgb0);
 929 sdev_vpd_pg_attr(pgb1);
 930 sdev_vpd_pg_attr(pgb2);
 931 sdev_vpd_pg_attr(pg0);
 932
 933 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 934                             struct bin_attribute *bin_attr,
 935                             char *buf, loff_t off, size_t count)
 936 {
 937         struct device *dev = kobj_to_dev(kobj);
 938         struct scsi_device *sdev = to_scsi_device(dev);
 939
 940         if (!sdev->inquiry)
 941                 return -EINVAL;
 942
 943         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 944                                        sdev->inquiry_len);
 945 }
 946
 947 static struct bin_attribute dev_attr_inquiry = {
 948         .attr = {
 949                 .name = "inquiry",
 950                 .mode = S_IRUGO,
 951         },
 952         .size = 0,
 953         .read = show_inquiry,
 954 };
 955
 956 static ssize_t
 957 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 958                         char *buf)
 959 {
 960         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 961 }
 962
 963 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 964
 965 #define show_sdev_iostat(field)                                         \
 966 static ssize_t                                                          \
 967 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 968                     char *buf)                                          \
 969 {                                                                       \
 970         struct scsi_device *sdev = to_scsi_device(dev);                 \
 971         unsigned long long count = atomic_read(&sdev->field);           \
 972         return snprintf(buf, 20, "0x%llx\n", count);                    \
 973 }                                                                       \
 974 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 975
 976 show_sdev_iostat(iorequest_cnt);
 977 show_sdev_iostat(iodone_cnt);
 978 show_sdev_iostat(ioerr_cnt);
 979
 980 static ssize_t
 981 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 982 {
 983         struct scsi_device *sdev;
 984         sdev = to_scsi_device(dev);
 985         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 986 }
 987 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 988
 989 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 990 static ssize_t                                                          \
 991 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 992                      char *buf)                                         \
 993 {                                                                       \
 994         struct scsi_device *sdev = to_scsi_device(dev);                 \
 995         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 996         return snprintf(buf, 20, "%d\n", val);                          \
 997 }
 998
 999 #define DECLARE_EVT_STORE(name, Cap_name)                               \
1000 static ssize_t                                                          \
1001 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
1002                       const char *buf, size_t count)                    \
1003 {                                                                       \
1004         struct scsi_device *sdev = to_scsi_device(dev);                 \
1005         int val = simple_strtoul(buf, NULL, 0);                         \
1006         if (val == 0)                                                   \
1007                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1008         else if (val == 1)                                              \
1009                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
1010         else                                                            \
1011                 return -EINVAL;                                         \
1012         return count;                                                   \
1013 }
1014
1015 #define DECLARE_EVT(name, Cap_name)                                     \
1016         DECLARE_EVT_SHOW(name, Cap_name)                                \
1017         DECLARE_EVT_STORE(name, Cap_name)                               \
1018         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
1019                            sdev_store_evt_##name);
1020 #define REF_EVT(name) &dev_attr_evt_##name.attr
1021
1022 DECLARE_EVT(media_change, MEDIA_CHANGE)
1023 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1024 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1025 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1026 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1027 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1028
1029 static ssize_t
1030 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1031                        const char *buf, size_t count)
1032 {
1033         int depth, retval;
1034         struct scsi_device *sdev = to_scsi_device(dev);
1035         struct scsi_host_template *sht = sdev->host->hostt;
1036
1037         if (!sht->change_queue_depth)
1038                 return -EINVAL;
1039
1040         depth = simple_strtoul(buf, NULL, 0);
1041
1042         if (depth < 1 || depth > sdev->host->can_queue)
1043                 return -EINVAL;
1044
1045         retval = sht->change_queue_depth(sdev, depth);
1046         if (retval < 0)
1047                 return retval;
1048
1049         sdev->max_queue_depth = sdev->queue_depth;
1050
1051         return count;
1052 }
1053 sdev_show_function(queue_depth, "%d\n");
1054
1055 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1056                    sdev_store_queue_depth);
1057
1058 static ssize_t
1059 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1060                     char *buf)
1061 {
1062         struct scsi_device *sdev = to_scsi_device(dev);
1063         ssize_t count;
1064
1065         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1066         if (count > 0) {
1067                 buf[count] = '\n';
1068                 count++;
1069         }
1070         return count;
1071 }
1072 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1073
1074 #define BLIST_FLAG_NAME(name)                                   \
1075         [const_ilog2((__force __u64)BLIST_##name)] = #name
1076 static const char *const sdev_bflags_name[] = {
1077 #include "scsi_devinfo_tbl.c"
1078 };
1079 #undef BLIST_FLAG_NAME
1080
1081 static ssize_t
1082 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1083                     char *buf)
1084 {
1085         struct scsi_device *sdev = to_scsi_device(dev);
1086         int i;
1087         ssize_t len = 0;
1088
1089         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1090                 const char *name = NULL;
1091
1092                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1093                         continue;
1094                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1095                         name = sdev_bflags_name[i];
1096
1097                 if (name)
1098                         len += scnprintf(buf + len, PAGE_SIZE - len,
1099                                          "%s%s", len ? " " : "", name);
1100                 else
1101                         len += scnprintf(buf + len, PAGE_SIZE - len,
1102                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1103         }
1104         if (len)
1105                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1106         return len;
1107 }
1108 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1109
1110 #ifdef CONFIG_SCSI_DH
1111 static ssize_t
1112 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1113                    char *buf)
1114 {
1115         struct scsi_device *sdev = to_scsi_device(dev);
1116
1117         if (!sdev->handler)
1118                 return snprintf(buf, 20, "detached\n");
1119
1120         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1121 }
1122
1123 static ssize_t
1124 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1125                     const char *buf, size_t count)
1126 {
1127         struct scsi_device *sdev = to_scsi_device(dev);
1128         int err = -EINVAL;
1129
1130         if (sdev->sdev_state == SDEV_CANCEL ||
1131             sdev->sdev_state == SDEV_DEL)
1132                 return -ENODEV;
1133
1134         if (!sdev->handler) {
1135                 /*
1136                  * Attach to a device handler
1137                  */
1138                 err = scsi_dh_attach(sdev->request_queue, buf);
1139         } else if (!strncmp(buf, "activate", 8)) {
1140                 /*
1141                  * Activate a device handler
1142                  */
1143                 if (sdev->handler->activate)
1144                         err = sdev->handler->activate(sdev, NULL, NULL);
1145                 else
1146                         err = 0;
1147         } else if (!strncmp(buf, "detach", 6)) {
1148                 /*
1149                  * Detach from a device handler
1150                  */
1151                 sdev_printk(KERN_WARNING, sdev,
1152                             "can't detach handler %s.\n",
1153                             sdev->handler->name);
1154                 err = -EINVAL;
1155         }
1156
1157         return err < 0 ? err : count;
1158 }
1159
1160 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1161                    sdev_store_dh_state);
1162
1163 static ssize_t
1164 sdev_show_access_state(struct device *dev,
1165                        struct device_attribute *attr,
1166                        char *buf)
1167 {
1168         struct scsi_device *sdev = to_scsi_device(dev);
1169         unsigned char access_state;
1170         const char *access_state_name;
1171
1172         if (!sdev->handler)
1173                 return -EINVAL;
1174
1175         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1176         access_state_name = scsi_access_state_name(access_state);
1177
1178         return sprintf(buf, "%s\n",
1179                        access_state_name ? access_state_name : "unknown");
1180 }
1181 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1182
1183 static ssize_t
1184 sdev_show_preferred_path(struct device *dev,
1185                          struct device_attribute *attr,
1186                          char *buf)
1187 {
1188         struct scsi_device *sdev = to_scsi_device(dev);
1189
1190         if (!sdev->handler)
1191                 return -EINVAL;
1192
1193         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1194                 return sprintf(buf, "1\n");
1195         else
1196                 return sprintf(buf, "0\n");
1197 }
1198 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1199 #endif
1200
1201 static ssize_t
1202 sdev_show_queue_ramp_up_period(struct device *dev,
1203                                struct device_attribute *attr,
1204                                char *buf)
1205 {
1206         struct scsi_device *sdev;
1207         sdev = to_scsi_device(dev);
1208         return snprintf(buf, 20, "%u\n",
1209                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1210 }
1211
1212 static ssize_t
1213 sdev_store_queue_ramp_up_period(struct device *dev,
1214                                 struct device_attribute *attr,
1215                                 const char *buf, size_t count)
1216 {
1217         struct scsi_device *sdev = to_scsi_device(dev);
1218         unsigned int period;
1219
1220         if (kstrtouint(buf, 10, &period))
1221                 return -EINVAL;
1222
1223         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1224         return count;
1225 }
1226
1227 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1228                    sdev_show_queue_ramp_up_period,
1229                    sdev_store_queue_ramp_up_period);
1230
1231 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1232                                          struct attribute *attr, int i)
1233 {
1234         struct device *dev = kobj_to_dev(kobj);
1235         struct scsi_device *sdev = to_scsi_device(dev);
1236
1237
1238         if (attr == &dev_attr_queue_depth.attr &&
1239             !sdev->host->hostt->change_queue_depth)
1240                 return S_IRUGO;
1241
1242         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1243             !sdev->host->hostt->change_queue_depth)
1244                 return 0;
1245
1246         return attr->mode;
1247 }
1248
1249 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1250                                              struct bin_attribute *attr, int i)
1251 {
1252         struct device *dev = kobj_to_dev(kobj);
1253         struct scsi_device *sdev = to_scsi_device(dev);
1254
1255
1256         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1257                 return 0;
1258
1259         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1260                 return 0;
1261
1262         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1263                 return 0;
1264
1265         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1266                 return 0;
1267
1268         if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1269                 return 0;
1270
1271         if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1272                 return 0;
1273
1274         if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1275                 return 0;
1276
1277         return S_IRUGO;
1278 }
1279
1280 /* Default template for device attributes.  May NOT be modified */
1281 static struct attribute *scsi_sdev_attrs[] = {
1282         &dev_attr_device_blocked.attr,
1283         &dev_attr_type.attr,
1284         &dev_attr_scsi_level.attr,
1285         &dev_attr_device_busy.attr,
1286         &dev_attr_vendor.attr,
1287         &dev_attr_model.attr,
1288         &dev_attr_rev.attr,
1289         &dev_attr_rescan.attr,
1290         &dev_attr_delete.attr,
1291         &dev_attr_state.attr,
1292         &dev_attr_timeout.attr,
1293         &dev_attr_eh_timeout.attr,
1294         &dev_attr_iocounterbits.attr,
1295         &dev_attr_iorequest_cnt.attr,
1296         &dev_attr_iodone_cnt.attr,
1297         &dev_attr_ioerr_cnt.attr,
1298         &dev_attr_modalias.attr,
1299         &dev_attr_queue_depth.attr,
1300         &dev_attr_queue_type.attr,
1301         &dev_attr_wwid.attr,
1302         &dev_attr_blacklist.attr,
1303 #ifdef CONFIG_SCSI_DH
1304         &dev_attr_dh_state.attr,
1305         &dev_attr_access_state.attr,
1306         &dev_attr_preferred_path.attr,
1307 #endif
1308         &dev_attr_queue_ramp_up_period.attr,
1309         REF_EVT(media_change),
1310         REF_EVT(inquiry_change_reported),
1311         REF_EVT(capacity_change_reported),
1312         REF_EVT(soft_threshold_reached),
1313         REF_EVT(mode_parameter_change_reported),
1314         REF_EVT(lun_change_reported),
1315         NULL
1316 };
1317
1318 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1319         &dev_attr_vpd_pg0,
1320         &dev_attr_vpd_pg83,
1321         &dev_attr_vpd_pg80,
1322         &dev_attr_vpd_pg89,
1323         &dev_attr_vpd_pgb0,
1324         &dev_attr_vpd_pgb1,
1325         &dev_attr_vpd_pgb2,
1326         &dev_attr_inquiry,
1327         NULL
1328 };
1329 static struct attribute_group scsi_sdev_attr_group = {
1330         .attrs =        scsi_sdev_attrs,
1331         .bin_attrs =    scsi_sdev_bin_attrs,
1332         .is_visible =   scsi_sdev_attr_is_visible,
1333         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1334 };
1335
1336 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1337         &scsi_sdev_attr_group,
1338         NULL
1339 };
1340
1341 static int scsi_target_add(struct scsi_target *starget)
1342 {
1343         int error;
1344
1345         if (starget->state != STARGET_CREATED)
1346                 return 0;
1347
1348         error = device_add(&starget->dev);
1349         if (error) {
1350                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1351                 return error;
1352         }
1353         transport_add_device(&starget->dev);
1354         starget->state = STARGET_RUNNING;
1355
1356         pm_runtime_set_active(&starget->dev);
1357         pm_runtime_enable(&starget->dev);
1358         device_enable_async_suspend(&starget->dev);
1359
1360         return 0;
1361 }
1362
1363 /**
1364  * scsi_sysfs_add_sdev - add scsi device to sysfs
1365  * @sdev:       scsi_device to add
1366  *
1367  * Return value:
1368  *      0 on Success / non-zero on Failure
1369  **/
1370 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1371 {
1372         int error;
1373         struct scsi_target *starget = sdev->sdev_target;
1374
1375         error = scsi_target_add(starget);
1376         if (error)
1377                 return error;
1378
1379         transport_configure_device(&starget->dev);
1380
1381         device_enable_async_suspend(&sdev->sdev_gendev);
1382         scsi_autopm_get_target(starget);
1383         pm_runtime_set_active(&sdev->sdev_gendev);
1384         if (!sdev->rpm_autosuspend)
1385                 pm_runtime_forbid(&sdev->sdev_gendev);
1386         pm_runtime_enable(&sdev->sdev_gendev);
1387         scsi_autopm_put_target(starget);
1388
1389         scsi_autopm_get_device(sdev);
1390
1391         scsi_dh_add_device(sdev);
1392
1393         error = device_add(&sdev->sdev_gendev);
1394         if (error) {
1395                 sdev_printk(KERN_INFO, sdev,
1396                                 "failed to add device: %d\n", error);
1397                 return error;
1398         }
1399
1400         device_enable_async_suspend(&sdev->sdev_dev);
1401         error = device_add(&sdev->sdev_dev);
1402         if (error) {
1403                 sdev_printk(KERN_INFO, sdev,
1404                                 "failed to add class device: %d\n", error);
1405                 device_del(&sdev->sdev_gendev);
1406                 return error;
1407         }
1408         transport_add_device(&sdev->sdev_gendev);
1409         sdev->is_visible = 1;
1410
1411         if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1412                 sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1413                 if (IS_ERR(sdev->bsg_dev)) {
1414                         error = PTR_ERR(sdev->bsg_dev);
1415                         sdev_printk(KERN_INFO, sdev,
1416                                     "Failed to register bsg queue, errno=%d\n",
1417                                     error);
1418                         sdev->bsg_dev = NULL;
1419                 }
1420         }
1421
1422         scsi_autopm_put_device(sdev);
1423         return error;
1424 }
1425
1426 void __scsi_remove_device(struct scsi_device *sdev)
1427 {
1428         struct device *dev = &sdev->sdev_gendev;
1429         int res;
1430
1431         /*
1432          * This cleanup path is not reentrant and while it is impossible
1433          * to get a new reference with scsi_device_get() someone can still
1434          * hold a previously acquired one.
1435          */
1436         if (sdev->sdev_state == SDEV_DEL)
1437                 return;
1438
1439         if (sdev->is_visible) {
1440                 /*
1441                  * If scsi_internal_target_block() is running concurrently,
1442                  * wait until it has finished before changing the device state.
1443                  */
1444                 mutex_lock(&sdev->state_mutex);
1445                 /*
1446                  * If blocked, we go straight to DEL and restart the queue so
1447                  * any commands issued during driver shutdown (like sync
1448                  * cache) are errored immediately.
1449                  */
1450                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1451                 if (res != 0) {
1452                         res = scsi_device_set_state(sdev, SDEV_DEL);
1453                         if (res == 0)
1454                                 scsi_start_queue(sdev);
1455                 }
1456                 mutex_unlock(&sdev->state_mutex);
1457
1458                 if (res != 0)
1459                         return;
1460
1461                 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1462                         bsg_unregister_queue(sdev->bsg_dev);
1463                 device_unregister(&sdev->sdev_dev);
1464                 transport_remove_device(dev);
1465                 device_del(dev);
1466         } else
1467                 put_device(&sdev->sdev_dev);
1468
1469         /*
1470          * Stop accepting new requests and wait until all queuecommand() and
1471          * scsi_run_queue() invocations have finished before tearing down the
1472          * device.
1473          */
1474         mutex_lock(&sdev->state_mutex);
1475         scsi_device_set_state(sdev, SDEV_DEL);
1476         mutex_unlock(&sdev->state_mutex);
1477
1478         blk_cleanup_queue(sdev->request_queue);
1479         cancel_work_sync(&sdev->requeue_work);
1480
1481         if (sdev->host->hostt->slave_destroy)
1482                 sdev->host->hostt->slave_destroy(sdev);
1483         transport_destroy_device(dev);
1484
1485         /*
1486          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1487          * removed sysfs visibility from the device, so make the target
1488          * invisible if this was the last device underneath it.
1489          */
1490         scsi_target_reap(scsi_target(sdev));
1491
1492         put_device(dev);
1493 }
1494
1495 /**
1496  * scsi_remove_device - unregister a device from the scsi bus
1497  * @sdev:       scsi_device to unregister
1498  **/
1499 void scsi_remove_device(struct scsi_device *sdev)
1500 {
1501         struct Scsi_Host *shost = sdev->host;
1502
1503         mutex_lock(&shost->scan_mutex);
1504         __scsi_remove_device(sdev);
1505         mutex_unlock(&shost->scan_mutex);
1506 }
1507 EXPORT_SYMBOL(scsi_remove_device);
1508
1509 static void __scsi_remove_target(struct scsi_target *starget)
1510 {
1511         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1512         unsigned long flags;
1513         struct scsi_device *sdev;
1514
1515         spin_lock_irqsave(shost->host_lock, flags);
1516  restart:
1517         list_for_each_entry(sdev, &shost->__devices, siblings) {
1518                 /*
1519                  * We cannot call scsi_device_get() here, as
1520                  * we might've been called from rmmod() causing
1521                  * scsi_device_get() to fail the module_is_live()
1522                  * check.
1523                  */
1524                 if (sdev->channel != starget->channel ||
1525                     sdev->id != starget->id)
1526                         continue;
1527                 if (sdev->sdev_state == SDEV_DEL ||
1528                     sdev->sdev_state == SDEV_CANCEL ||
1529                     !get_device(&sdev->sdev_gendev))
1530                         continue;
1531                 spin_unlock_irqrestore(shost->host_lock, flags);
1532                 scsi_remove_device(sdev);
1533                 put_device(&sdev->sdev_gendev);
1534                 spin_lock_irqsave(shost->host_lock, flags);
1535                 goto restart;
1536         }
1537         spin_unlock_irqrestore(shost->host_lock, flags);
1538 }
1539
1540 /**
1541  * scsi_remove_target - try to remove a target and all its devices
1542  * @dev: generic starget or parent of generic stargets to be removed
1543  *
1544  * Note: This is slightly racy.  It is possible that if the user
1545  * requests the addition of another device then the target won't be
1546  * removed.
1547  */
1548 void scsi_remove_target(struct device *dev)
1549 {
1550         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1551         struct scsi_target *starget;
1552         unsigned long flags;
1553
1554 restart:
1555         spin_lock_irqsave(shost->host_lock, flags);
1556         list_for_each_entry(starget, &shost->__targets, siblings) {
1557                 if (starget->state == STARGET_DEL ||
1558                     starget->state == STARGET_REMOVE ||
1559                     starget->state == STARGET_CREATED_REMOVE)
1560                         continue;
1561                 if (starget->dev.parent == dev || &starget->dev == dev) {
1562                         kref_get(&starget->reap_ref);
1563                         if (starget->state == STARGET_CREATED)
1564                                 starget->state = STARGET_CREATED_REMOVE;
1565                         else
1566                                 starget->state = STARGET_REMOVE;
1567                         spin_unlock_irqrestore(shost->host_lock, flags);
1568                         __scsi_remove_target(starget);
1569                         scsi_target_reap(starget);
1570                         goto restart;
1571                 }
1572         }
1573         spin_unlock_irqrestore(shost->host_lock, flags);
1574 }
1575 EXPORT_SYMBOL(scsi_remove_target);
1576
1577 int scsi_register_driver(struct device_driver *drv)
1578 {
1579         drv->bus = &scsi_bus_type;
1580
1581         return driver_register(drv);
1582 }
1583 EXPORT_SYMBOL(scsi_register_driver);
1584
1585 int scsi_register_interface(struct class_interface *intf)
1586 {
1587         intf->class = &sdev_class;
1588
1589         return class_interface_register(intf);
1590 }
1591 EXPORT_SYMBOL(scsi_register_interface);
1592
1593 /**
1594  * scsi_sysfs_add_host - add scsi host to subsystem
1595  * @shost:     scsi host struct to add to subsystem
1596  **/
1597 int scsi_sysfs_add_host(struct Scsi_Host *shost)
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_host_template *hostt = shost->hostt;
1615         struct scsi_target  *starget = sdev->sdev_target;
1616
1617         device_initialize(&sdev->sdev_gendev);
1618         sdev->sdev_gendev.bus = &scsi_bus_type;
1619         sdev->sdev_gendev.type = &scsi_dev_type;
1620         scsi_enable_async_suspend(&sdev->sdev_gendev);
1621         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1622                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1623         sdev->sdev_gendev.groups = hostt->sdev_groups;
1624
1625         device_initialize(&sdev->sdev_dev);
1626         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1627         sdev->sdev_dev.class = &sdev_class;
1628         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1629                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1630         /*
1631          * Get a default scsi_level from the target (derived from sibling
1632          * devices).  This is the best we can do for guessing how to set
1633          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1634          * setting doesn't matter, because all the bits are zero anyway.
1635          * But it does matter for higher LUNs.
1636          */
1637         sdev->scsi_level = starget->scsi_level;
1638         if (sdev->scsi_level <= SCSI_2 &&
1639                         sdev->scsi_level != SCSI_UNKNOWN &&
1640                         !shost->no_scsi2_lun_in_cdb)
1641                 sdev->lun_in_cdb = 1;
1642
1643         transport_setup_device(&sdev->sdev_gendev);
1644         spin_lock_irqsave(shost->host_lock, flags);
1645         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1646         list_add_tail(&sdev->siblings, &shost->__devices);
1647         spin_unlock_irqrestore(shost->host_lock, flags);
1648         /*
1649          * device can now only be removed via __scsi_remove_device() so hold
1650          * the target.  Target will be held in CREATED state until something
1651          * beneath it becomes visible (in which case it moves to RUNNING)
1652          */
1653         kref_get(&starget->reap_ref);
1654 }
1655
1656 int scsi_is_sdev_device(const struct device *dev)
1657 {
1658         return dev->type == &scsi_dev_type;
1659 }
1660 EXPORT_SYMBOL(scsi_is_sdev_device);
1661
1662 /* A blank transport template that is used in drivers that don't
1663  * yet implement Transport Attributes */
1664 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };