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 = container_of(work, struct scsi_device,
 447                                                 ew.work);
 448         struct scsi_target *starget = sdev->sdev_target;
 449         struct device *parent;
 450         struct list_head *this, *tmp;
 451         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 452         struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
 453         struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL;
 454         unsigned long flags;
 455
 456         scsi_dh_release_device(sdev);
 457
 458         parent = sdev->sdev_gendev.parent;
 459
 460         spin_lock_irqsave(sdev->host->host_lock, flags);
 461         list_del(&sdev->siblings);
 462         list_del(&sdev->same_target_siblings);
 463         list_del(&sdev->starved_entry);
 464         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 465
 466         cancel_work_sync(&sdev->event_work);
 467
 468         list_for_each_safe(this, tmp, &sdev->event_list) {
 469                 struct scsi_event *evt;
 470
 471                 evt = list_entry(this, struct scsi_event, node);
 472                 list_del(&evt->node);
 473                 kfree(evt);
 474         }
 475
 476         blk_put_queue(sdev->request_queue);
 477         /* NULL queue means the device can't be used */
 478         sdev->request_queue = NULL;
 479
 480         sbitmap_free(&sdev->budget_map);
 481
 482         mutex_lock(&sdev->inquiry_mutex);
 483         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 484                                        lockdep_is_held(&sdev->inquiry_mutex));
 485         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 486                                        lockdep_is_held(&sdev->inquiry_mutex));
 487         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 488                                        lockdep_is_held(&sdev->inquiry_mutex));
 489         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 490                                        lockdep_is_held(&sdev->inquiry_mutex));
 491         vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
 492                                        lockdep_is_held(&sdev->inquiry_mutex));
 493         vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
 494                                        lockdep_is_held(&sdev->inquiry_mutex));
 495         vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
 496                                        lockdep_is_held(&sdev->inquiry_mutex));
 497         mutex_unlock(&sdev->inquiry_mutex);
 498
 499         if (vpd_pg0)
 500                 kfree_rcu(vpd_pg0, rcu);
 501         if (vpd_pg83)
 502                 kfree_rcu(vpd_pg83, rcu);
 503         if (vpd_pg80)
 504                 kfree_rcu(vpd_pg80, rcu);
 505         if (vpd_pg89)
 506                 kfree_rcu(vpd_pg89, rcu);
 507         if (vpd_pgb0)
 508                 kfree_rcu(vpd_pgb0, rcu);
 509         if (vpd_pgb1)
 510                 kfree_rcu(vpd_pgb1, rcu);
 511         if (vpd_pgb2)
 512                 kfree_rcu(vpd_pgb2, rcu);
 513         kfree(sdev->inquiry);
 514         kfree(sdev);
 515
 516         if (starget && atomic_dec_return(&starget->sdev_count) == 0)
 517                 wake_up(&starget->sdev_wq);
 518
 519         if (parent)
 520                 put_device(parent);
 521 }
 522
 523 static void scsi_device_dev_release(struct device *dev)
 524 {
 525         struct scsi_device *sdp = to_scsi_device(dev);
 526         execute_in_process_context(scsi_device_dev_release_usercontext,
 527                                    &sdp->ew);
 528 }
 529
 530 static struct class sdev_class = {
 531         .name           = "scsi_device",
 532         .dev_release    = scsi_device_cls_release,
 533 };
 534
 535 /* all probing is done in the individual ->probe routines */
 536 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 537 {
 538         struct scsi_device *sdp;
 539
 540         if (dev->type != &scsi_dev_type)
 541                 return 0;
 542
 543         sdp = to_scsi_device(dev);
 544         if (sdp->no_uld_attach)
 545                 return 0;
 546         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 547 }
 548
 549 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 550 {
 551         struct scsi_device *sdev;
 552
 553         if (dev->type != &scsi_dev_type)
 554                 return 0;
 555
 556         sdev = to_scsi_device(dev);
 557
 558         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 559         return 0;
 560 }
 561
 562 struct bus_type scsi_bus_type = {
 563         .name           = "scsi",
 564         .match          = scsi_bus_match,
 565         .uevent         = scsi_bus_uevent,
 566 #ifdef CONFIG_PM
 567         .pm             = &scsi_bus_pm_ops,
 568 #endif
 569 };
 570
 571 int scsi_sysfs_register(void)
 572 {
 573         int error;
 574
 575         error = bus_register(&scsi_bus_type);
 576         if (!error) {
 577                 error = class_register(&sdev_class);
 578                 if (error)
 579                         bus_unregister(&scsi_bus_type);
 580         }
 581
 582         return error;
 583 }
 584
 585 void scsi_sysfs_unregister(void)
 586 {
 587         class_unregister(&sdev_class);
 588         bus_unregister(&scsi_bus_type);
 589 }
 590
 591 /*
 592  * sdev_show_function: macro to create an attr function that can be used to
 593  * show a non-bit field.
 594  */
 595 #define sdev_show_function(field, format_string)                                \
 596 static ssize_t                                                          \
 597 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 598                    char *buf)                                           \
 599 {                                                                       \
 600         struct scsi_device *sdev;                                       \
 601         sdev = to_scsi_device(dev);                                     \
 602         return snprintf (buf, 20, format_string, sdev->field);          \
 603 }                                                                       \
 604
 605 /*
 606  * sdev_rd_attr: macro to create a function and attribute variable for a
 607  * read only field.
 608  */
 609 #define sdev_rd_attr(field, format_string)                              \
 610         sdev_show_function(field, format_string)                        \
 611 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 612
 613
 614 /*
 615  * sdev_rw_attr: create a function and attribute variable for a
 616  * read/write field.
 617  */
 618 #define sdev_rw_attr(field, format_string)                              \
 619         sdev_show_function(field, format_string)                                \
 620                                                                         \
 621 static ssize_t                                                          \
 622 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 623                     const char *buf, size_t count)                      \
 624 {                                                                       \
 625         struct scsi_device *sdev;                                       \
 626         sdev = to_scsi_device(dev);                                     \
 627         sscanf (buf, format_string, &sdev->field);                      \
 628         return count;                                                   \
 629 }                                                                       \
 630 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 631
 632 /* Currently we don't export bit fields, but we might in future,
 633  * so leave this code in */
 634 #if 0
 635 /*
 636  * sdev_rd_attr: create a function and attribute variable for a
 637  * read/write bit field.
 638  */
 639 #define sdev_rw_attr_bit(field)                                         \
 640         sdev_show_function(field, "%d\n")                                       \
 641                                                                         \
 642 static ssize_t                                                          \
 643 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 644                     const char *buf, size_t count)                      \
 645 {                                                                       \
 646         int ret;                                                        \
 647         struct scsi_device *sdev;                                       \
 648         ret = scsi_sdev_check_buf_bit(buf);                             \
 649         if (ret >= 0)   {                                               \
 650                 sdev = to_scsi_device(dev);                             \
 651                 sdev->field = ret;                                      \
 652                 ret = count;                                            \
 653         }                                                               \
 654         return ret;                                                     \
 655 }                                                                       \
 656 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 657
 658 /*
 659  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 660  * else return -EINVAL.
 661  */
 662 static int scsi_sdev_check_buf_bit(const char *buf)
 663 {
 664         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 665                 if (buf[0] == '1')
 666                         return 1;
 667                 else if (buf[0] == '0')
 668                         return 0;
 669                 else
 670                         return -EINVAL;
 671         } else
 672                 return -EINVAL;
 673 }
 674 #endif
 675 /*
 676  * Create the actual show/store functions and data structures.
 677  */
 678 sdev_rd_attr (type, "%d\n");
 679 sdev_rd_attr (scsi_level, "%d\n");
 680 sdev_rd_attr (vendor, "%.8s\n");
 681 sdev_rd_attr (model, "%.16s\n");
 682 sdev_rd_attr (rev, "%.4s\n");
 683
 684 static ssize_t
 685 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 686                 char *buf)
 687 {
 688         struct scsi_device *sdev = to_scsi_device(dev);
 689         return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 690 }
 691 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 692
 693 static ssize_t
 694 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 695                 char *buf)
 696 {
 697         struct scsi_device *sdev = to_scsi_device(dev);
 698         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 699 }
 700 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 701
 702 /*
 703  * TODO: can we make these symlinks to the block layer ones?
 704  */
 705 static ssize_t
 706 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 707 {
 708         struct scsi_device *sdev;
 709         sdev = to_scsi_device(dev);
 710         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 711 }
 712
 713 static ssize_t
 714 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 715                     const char *buf, size_t count)
 716 {
 717         struct scsi_device *sdev;
 718         int timeout;
 719         sdev = to_scsi_device(dev);
 720         sscanf (buf, "%d\n", &timeout);
 721         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 722         return count;
 723 }
 724 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 725
 726 static ssize_t
 727 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 728 {
 729         struct scsi_device *sdev;
 730         sdev = to_scsi_device(dev);
 731         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 732 }
 733
 734 static ssize_t
 735 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 736                     const char *buf, size_t count)
 737 {
 738         struct scsi_device *sdev;
 739         unsigned int eh_timeout;
 740         int err;
 741
 742         if (!capable(CAP_SYS_ADMIN))
 743                 return -EACCES;
 744
 745         sdev = to_scsi_device(dev);
 746         err = kstrtouint(buf, 10, &eh_timeout);
 747         if (err)
 748                 return err;
 749         sdev->eh_timeout = eh_timeout * HZ;
 750
 751         return count;
 752 }
 753 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 754
 755 static ssize_t
 756 store_rescan_field (struct device *dev, struct device_attribute *attr,
 757                     const char *buf, size_t count)
 758 {
 759         scsi_rescan_device(dev);
 760         return count;
 761 }
 762 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 763
 764 static ssize_t
 765 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 766                   const char *buf, size_t count)
 767 {
 768         struct kernfs_node *kn;
 769         struct scsi_device *sdev = to_scsi_device(dev);
 770
 771         /*
 772          * We need to try to get module, avoiding the module been removed
 773          * during delete.
 774          */
 775         if (scsi_device_get(sdev))
 776                 return -ENODEV;
 777
 778         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 779         WARN_ON_ONCE(!kn);
 780         /*
 781          * Concurrent writes into the "delete" sysfs attribute may trigger
 782          * concurrent calls to device_remove_file() and scsi_remove_device().
 783          * device_remove_file() handles concurrent removal calls by
 784          * serializing these and by ignoring the second and later removal
 785          * attempts.  Concurrent calls of scsi_remove_device() are
 786          * serialized. The second and later calls of scsi_remove_device() are
 787          * ignored because the first call of that function changes the device
 788          * state into SDEV_DEL.
 789          */
 790         device_remove_file(dev, attr);
 791         scsi_remove_device(sdev);
 792         if (kn)
 793                 sysfs_unbreak_active_protection(kn);
 794         scsi_device_put(sdev);
 795         return count;
 796 };
 797 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 798
 799 static ssize_t
 800 store_state_field(struct device *dev, struct device_attribute *attr,
 801                   const char *buf, size_t count)
 802 {
 803         int i, ret;
 804         struct scsi_device *sdev = to_scsi_device(dev);
 805         enum scsi_device_state state = 0;
 806         bool rescan_dev = false;
 807
 808         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 809                 const int len = strlen(sdev_states[i].name);
 810                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 811                    buf[len] == '\n') {
 812                         state = sdev_states[i].value;
 813                         break;
 814                 }
 815         }
 816         switch (state) {
 817         case SDEV_RUNNING:
 818         case SDEV_OFFLINE:
 819                 break;
 820         default:
 821                 return -EINVAL;
 822         }
 823
 824         mutex_lock(&sdev->state_mutex);
 825         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
 826                 ret = 0;
 827         } else {
 828                 ret = scsi_device_set_state(sdev, state);
 829                 if (ret == 0 && state == SDEV_RUNNING)
 830                         rescan_dev = true;
 831         }
 832         mutex_unlock(&sdev->state_mutex);
 833
 834         if (rescan_dev) {
 835                 /*
 836                  * If the device state changes to SDEV_RUNNING, we need to
 837                  * run the queue to avoid I/O hang, and rescan the device
 838                  * to revalidate it. Running the queue first is necessary
 839                  * because another thread may be waiting inside
 840                  * blk_mq_freeze_queue_wait() and because that call may be
 841                  * waiting for pending I/O to finish.
 842                  */
 843                 blk_mq_run_hw_queues(sdev->request_queue, true);
 844                 scsi_rescan_device(dev);
 845         }
 846
 847         return ret == 0 ? count : -EINVAL;
 848 }
 849
 850 static ssize_t
 851 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 852 {
 853         struct scsi_device *sdev = to_scsi_device(dev);
 854         const char *name = scsi_device_state_name(sdev->sdev_state);
 855
 856         if (!name)
 857                 return -EINVAL;
 858
 859         return snprintf(buf, 20, "%s\n", name);
 860 }
 861
 862 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 863
 864 static ssize_t
 865 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 866                       char *buf)
 867 {
 868         struct scsi_device *sdev = to_scsi_device(dev);
 869         const char *name = "none";
 870
 871         if (sdev->simple_tags)
 872                 name = "simple";
 873
 874         return snprintf(buf, 20, "%s\n", name);
 875 }
 876
 877 static ssize_t
 878 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 879                        const char *buf, size_t count)
 880 {
 881         struct scsi_device *sdev = to_scsi_device(dev);
 882
 883         if (!sdev->tagged_supported)
 884                 return -EINVAL;
 885
 886         sdev_printk(KERN_INFO, sdev,
 887                     "ignoring write to deprecated queue_type attribute");
 888         return count;
 889 }
 890
 891 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 892                    store_queue_type_field);
 893
 894 #define sdev_vpd_pg_attr(_page)                                         \
 895 static ssize_t                                                  \
 896 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 897                  struct bin_attribute *bin_attr,                        \
 898                  char *buf, loff_t off, size_t count)                   \
 899 {                                                                       \
 900         struct device *dev = kobj_to_dev(kobj);                         \
 901         struct scsi_device *sdev = to_scsi_device(dev);                 \
 902         struct scsi_vpd *vpd_page;                                      \
 903         int ret = -EINVAL;                                              \
 904                                                                         \
 905         rcu_read_lock();                                                \
 906         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 907         if (vpd_page)                                                   \
 908                 ret = memory_read_from_buffer(buf, count, &off,         \
 909                                 vpd_page->data, vpd_page->len);         \
 910         rcu_read_unlock();                                              \
 911         return ret;                                                     \
 912 }                                                                       \
 913 static struct bin_attribute dev_attr_vpd_##_page = {            \
 914         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 915         .size = 0,                                                      \
 916         .read = show_vpd_##_page,                                       \
 917 };
 918
 919 sdev_vpd_pg_attr(pg83);
 920 sdev_vpd_pg_attr(pg80);
 921 sdev_vpd_pg_attr(pg89);
 922 sdev_vpd_pg_attr(pgb0);
 923 sdev_vpd_pg_attr(pgb1);
 924 sdev_vpd_pg_attr(pgb2);
 925 sdev_vpd_pg_attr(pg0);
 926
 927 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 928                             struct bin_attribute *bin_attr,
 929                             char *buf, loff_t off, size_t count)
 930 {
 931         struct device *dev = kobj_to_dev(kobj);
 932         struct scsi_device *sdev = to_scsi_device(dev);
 933
 934         if (!sdev->inquiry)
 935                 return -EINVAL;
 936
 937         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 938                                        sdev->inquiry_len);
 939 }
 940
 941 static struct bin_attribute dev_attr_inquiry = {
 942         .attr = {
 943                 .name = "inquiry",
 944                 .mode = S_IRUGO,
 945         },
 946         .size = 0,
 947         .read = show_inquiry,
 948 };
 949
 950 static ssize_t
 951 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 952                         char *buf)
 953 {
 954         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 955 }
 956
 957 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 958
 959 #define show_sdev_iostat(field)                                         \
 960 static ssize_t                                                          \
 961 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 962                     char *buf)                                          \
 963 {                                                                       \
 964         struct scsi_device *sdev = to_scsi_device(dev);                 \
 965         unsigned long long count = atomic_read(&sdev->field);           \
 966         return snprintf(buf, 20, "0x%llx\n", count);                    \
 967 }                                                                       \
 968 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 969
 970 show_sdev_iostat(iorequest_cnt);
 971 show_sdev_iostat(iodone_cnt);
 972 show_sdev_iostat(ioerr_cnt);
 973
 974 static ssize_t
 975 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 976 {
 977         struct scsi_device *sdev;
 978         sdev = to_scsi_device(dev);
 979         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 980 }
 981 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 982
 983 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 984 static ssize_t                                                          \
 985 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 986                      char *buf)                                         \
 987 {                                                                       \
 988         struct scsi_device *sdev = to_scsi_device(dev);                 \
 989         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 990         return snprintf(buf, 20, "%d\n", val);                          \
 991 }
 992
 993 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 994 static ssize_t                                                          \
 995 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 996                       const char *buf, size_t count)                    \
 997 {                                                                       \
 998         struct scsi_device *sdev = to_scsi_device(dev);                 \
 999         int val = simple_strtoul(buf, NULL, 0);                         \
1000         if (val == 0)                                                   \
1001                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1002         else if (val == 1)                                              \
1003                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
1004         else                                                            \
1005                 return -EINVAL;                                         \
1006         return count;                                                   \
1007 }
1008
1009 #define DECLARE_EVT(name, Cap_name)                                     \
1010         DECLARE_EVT_SHOW(name, Cap_name)                                \
1011         DECLARE_EVT_STORE(name, Cap_name)                               \
1012         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
1013                            sdev_store_evt_##name);
1014 #define REF_EVT(name) &dev_attr_evt_##name.attr
1015
1016 DECLARE_EVT(media_change, MEDIA_CHANGE)
1017 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1018 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1019 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1020 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1021 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1022
1023 static ssize_t
1024 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1025                        const char *buf, size_t count)
1026 {
1027         int depth, retval;
1028         struct scsi_device *sdev = to_scsi_device(dev);
1029         struct scsi_host_template *sht = sdev->host->hostt;
1030
1031         if (!sht->change_queue_depth)
1032                 return -EINVAL;
1033
1034         depth = simple_strtoul(buf, NULL, 0);
1035
1036         if (depth < 1 || depth > sdev->host->can_queue)
1037                 return -EINVAL;
1038
1039         retval = sht->change_queue_depth(sdev, depth);
1040         if (retval < 0)
1041                 return retval;
1042
1043         sdev->max_queue_depth = sdev->queue_depth;
1044
1045         return count;
1046 }
1047 sdev_show_function(queue_depth, "%d\n");
1048
1049 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1050                    sdev_store_queue_depth);
1051
1052 static ssize_t
1053 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1054                     char *buf)
1055 {
1056         struct scsi_device *sdev = to_scsi_device(dev);
1057         ssize_t count;
1058
1059         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1060         if (count > 0) {
1061                 buf[count] = '\n';
1062                 count++;
1063         }
1064         return count;
1065 }
1066 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1067
1068 #define BLIST_FLAG_NAME(name)                                   \
1069         [const_ilog2((__force __u64)BLIST_##name)] = #name
1070 static const char *const sdev_bflags_name[] = {
1071 #include "scsi_devinfo_tbl.c"
1072 };
1073 #undef BLIST_FLAG_NAME
1074
1075 static ssize_t
1076 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1077                     char *buf)
1078 {
1079         struct scsi_device *sdev = to_scsi_device(dev);
1080         int i;
1081         ssize_t len = 0;
1082
1083         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1084                 const char *name = NULL;
1085
1086                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1087                         continue;
1088                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1089                         name = sdev_bflags_name[i];
1090
1091                 if (name)
1092                         len += scnprintf(buf + len, PAGE_SIZE - len,
1093                                          "%s%s", len ? " " : "", name);
1094                 else
1095                         len += scnprintf(buf + len, PAGE_SIZE - len,
1096                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1097         }
1098         if (len)
1099                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1100         return len;
1101 }
1102 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1103
1104 #ifdef CONFIG_SCSI_DH
1105 static ssize_t
1106 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1107                    char *buf)
1108 {
1109         struct scsi_device *sdev = to_scsi_device(dev);
1110
1111         if (!sdev->handler)
1112                 return snprintf(buf, 20, "detached\n");
1113
1114         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1115 }
1116
1117 static ssize_t
1118 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1119                     const char *buf, size_t count)
1120 {
1121         struct scsi_device *sdev = to_scsi_device(dev);
1122         int err = -EINVAL;
1123
1124         if (sdev->sdev_state == SDEV_CANCEL ||
1125             sdev->sdev_state == SDEV_DEL)
1126                 return -ENODEV;
1127
1128         if (!sdev->handler) {
1129                 /*
1130                  * Attach to a device handler
1131                  */
1132                 err = scsi_dh_attach(sdev->request_queue, buf);
1133         } else if (!strncmp(buf, "activate", 8)) {
1134                 /*
1135                  * Activate a device handler
1136                  */
1137                 if (sdev->handler->activate)
1138                         err = sdev->handler->activate(sdev, NULL, NULL);
1139                 else
1140                         err = 0;
1141         } else if (!strncmp(buf, "detach", 6)) {
1142                 /*
1143                  * Detach from a device handler
1144                  */
1145                 sdev_printk(KERN_WARNING, sdev,
1146                             "can't detach handler %s.\n",
1147                             sdev->handler->name);
1148                 err = -EINVAL;
1149         }
1150
1151         return err < 0 ? err : count;
1152 }
1153
1154 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1155                    sdev_store_dh_state);
1156
1157 static ssize_t
1158 sdev_show_access_state(struct device *dev,
1159                        struct device_attribute *attr,
1160                        char *buf)
1161 {
1162         struct scsi_device *sdev = to_scsi_device(dev);
1163         unsigned char access_state;
1164         const char *access_state_name;
1165
1166         if (!sdev->handler)
1167                 return -EINVAL;
1168
1169         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1170         access_state_name = scsi_access_state_name(access_state);
1171
1172         return sprintf(buf, "%s\n",
1173                        access_state_name ? access_state_name : "unknown");
1174 }
1175 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1176
1177 static ssize_t
1178 sdev_show_preferred_path(struct device *dev,
1179                          struct device_attribute *attr,
1180                          char *buf)
1181 {
1182         struct scsi_device *sdev = to_scsi_device(dev);
1183
1184         if (!sdev->handler)
1185                 return -EINVAL;
1186
1187         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1188                 return sprintf(buf, "1\n");
1189         else
1190                 return sprintf(buf, "0\n");
1191 }
1192 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1193 #endif
1194
1195 static ssize_t
1196 sdev_show_queue_ramp_up_period(struct device *dev,
1197                                struct device_attribute *attr,
1198                                char *buf)
1199 {
1200         struct scsi_device *sdev;
1201         sdev = to_scsi_device(dev);
1202         return snprintf(buf, 20, "%u\n",
1203                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1204 }
1205
1206 static ssize_t
1207 sdev_store_queue_ramp_up_period(struct device *dev,
1208                                 struct device_attribute *attr,
1209                                 const char *buf, size_t count)
1210 {
1211         struct scsi_device *sdev = to_scsi_device(dev);
1212         unsigned int period;
1213
1214         if (kstrtouint(buf, 10, &period))
1215                 return -EINVAL;
1216
1217         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1218         return count;
1219 }
1220
1221 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1222                    sdev_show_queue_ramp_up_period,
1223                    sdev_store_queue_ramp_up_period);
1224
1225 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1226                                          struct 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_queue_depth.attr &&
1233             !sdev->host->hostt->change_queue_depth)
1234                 return S_IRUGO;
1235
1236         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1237             !sdev->host->hostt->change_queue_depth)
1238                 return 0;
1239
1240         return attr->mode;
1241 }
1242
1243 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1244                                              struct bin_attribute *attr, int i)
1245 {
1246         struct device *dev = kobj_to_dev(kobj);
1247         struct scsi_device *sdev = to_scsi_device(dev);
1248
1249
1250         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1251                 return 0;
1252
1253         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1254                 return 0;
1255
1256         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1257                 return 0;
1258
1259         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1260                 return 0;
1261
1262         if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1263                 return 0;
1264
1265         if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1266                 return 0;
1267
1268         if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1269                 return 0;
1270
1271         return S_IRUGO;
1272 }
1273
1274 /* Default template for device attributes.  May NOT be modified */
1275 static struct attribute *scsi_sdev_attrs[] = {
1276         &dev_attr_device_blocked.attr,
1277         &dev_attr_type.attr,
1278         &dev_attr_scsi_level.attr,
1279         &dev_attr_device_busy.attr,
1280         &dev_attr_vendor.attr,
1281         &dev_attr_model.attr,
1282         &dev_attr_rev.attr,
1283         &dev_attr_rescan.attr,
1284         &dev_attr_delete.attr,
1285         &dev_attr_state.attr,
1286         &dev_attr_timeout.attr,
1287         &dev_attr_eh_timeout.attr,
1288         &dev_attr_iocounterbits.attr,
1289         &dev_attr_iorequest_cnt.attr,
1290         &dev_attr_iodone_cnt.attr,
1291         &dev_attr_ioerr_cnt.attr,
1292         &dev_attr_modalias.attr,
1293         &dev_attr_queue_depth.attr,
1294         &dev_attr_queue_type.attr,
1295         &dev_attr_wwid.attr,
1296         &dev_attr_blacklist.attr,
1297 #ifdef CONFIG_SCSI_DH
1298         &dev_attr_dh_state.attr,
1299         &dev_attr_access_state.attr,
1300         &dev_attr_preferred_path.attr,
1301 #endif
1302         &dev_attr_queue_ramp_up_period.attr,
1303         REF_EVT(media_change),
1304         REF_EVT(inquiry_change_reported),
1305         REF_EVT(capacity_change_reported),
1306         REF_EVT(soft_threshold_reached),
1307         REF_EVT(mode_parameter_change_reported),
1308         REF_EVT(lun_change_reported),
1309         NULL
1310 };
1311
1312 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1313         &dev_attr_vpd_pg0,
1314         &dev_attr_vpd_pg83,
1315         &dev_attr_vpd_pg80,
1316         &dev_attr_vpd_pg89,
1317         &dev_attr_vpd_pgb0,
1318         &dev_attr_vpd_pgb1,
1319         &dev_attr_vpd_pgb2,
1320         &dev_attr_inquiry,
1321         NULL
1322 };
1323 static struct attribute_group scsi_sdev_attr_group = {
1324         .attrs =        scsi_sdev_attrs,
1325         .bin_attrs =    scsi_sdev_bin_attrs,
1326         .is_visible =   scsi_sdev_attr_is_visible,
1327         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1328 };
1329
1330 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1331         &scsi_sdev_attr_group,
1332         NULL
1333 };
1334
1335 static int scsi_target_add(struct scsi_target *starget)
1336 {
1337         int error;
1338
1339         if (starget->state != STARGET_CREATED)
1340                 return 0;
1341
1342         error = device_add(&starget->dev);
1343         if (error) {
1344                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1345                 return error;
1346         }
1347         transport_add_device(&starget->dev);
1348         starget->state = STARGET_RUNNING;
1349
1350         pm_runtime_set_active(&starget->dev);
1351         pm_runtime_enable(&starget->dev);
1352         device_enable_async_suspend(&starget->dev);
1353
1354         return 0;
1355 }
1356
1357 /**
1358  * scsi_sysfs_add_sdev - add scsi device to sysfs
1359  * @sdev:       scsi_device to add
1360  *
1361  * Return value:
1362  *      0 on Success / non-zero on Failure
1363  **/
1364 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1365 {
1366         int error;
1367         struct scsi_target *starget = sdev->sdev_target;
1368
1369         error = scsi_target_add(starget);
1370         if (error)
1371                 return error;
1372
1373         transport_configure_device(&starget->dev);
1374
1375         device_enable_async_suspend(&sdev->sdev_gendev);
1376         scsi_autopm_get_target(starget);
1377         pm_runtime_set_active(&sdev->sdev_gendev);
1378         if (!sdev->rpm_autosuspend)
1379                 pm_runtime_forbid(&sdev->sdev_gendev);
1380         pm_runtime_enable(&sdev->sdev_gendev);
1381         scsi_autopm_put_target(starget);
1382
1383         scsi_autopm_get_device(sdev);
1384
1385         scsi_dh_add_device(sdev);
1386
1387         error = device_add(&sdev->sdev_gendev);
1388         if (error) {
1389                 sdev_printk(KERN_INFO, sdev,
1390                                 "failed to add device: %d\n", error);
1391                 return error;
1392         }
1393
1394         device_enable_async_suspend(&sdev->sdev_dev);
1395         error = device_add(&sdev->sdev_dev);
1396         if (error) {
1397                 sdev_printk(KERN_INFO, sdev,
1398                                 "failed to add class device: %d\n", error);
1399                 device_del(&sdev->sdev_gendev);
1400                 return error;
1401         }
1402         transport_add_device(&sdev->sdev_gendev);
1403         sdev->is_visible = 1;
1404
1405         if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1406                 sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1407                 if (IS_ERR(sdev->bsg_dev)) {
1408                         error = PTR_ERR(sdev->bsg_dev);
1409                         sdev_printk(KERN_INFO, sdev,
1410                                     "Failed to register bsg queue, errno=%d\n",
1411                                     error);
1412                         sdev->bsg_dev = NULL;
1413                 }
1414         }
1415
1416         scsi_autopm_put_device(sdev);
1417         return error;
1418 }
1419
1420 void __scsi_remove_device(struct scsi_device *sdev)
1421 {
1422         struct device *dev = &sdev->sdev_gendev;
1423         int res;
1424
1425         /*
1426          * This cleanup path is not reentrant and while it is impossible
1427          * to get a new reference with scsi_device_get() someone can still
1428          * hold a previously acquired one.
1429          */
1430         if (sdev->sdev_state == SDEV_DEL)
1431                 return;
1432
1433         if (sdev->is_visible) {
1434                 /*
1435                  * If scsi_internal_target_block() is running concurrently,
1436                  * wait until it has finished before changing the device state.
1437                  */
1438                 mutex_lock(&sdev->state_mutex);
1439                 /*
1440                  * If blocked, we go straight to DEL and restart the queue so
1441                  * any commands issued during driver shutdown (like sync
1442                  * cache) are errored immediately.
1443                  */
1444                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1445                 if (res != 0) {
1446                         res = scsi_device_set_state(sdev, SDEV_DEL);
1447                         if (res == 0)
1448                                 scsi_start_queue(sdev);
1449                 }
1450                 mutex_unlock(&sdev->state_mutex);
1451
1452                 if (res != 0)
1453                         return;
1454
1455                 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1456                         bsg_unregister_queue(sdev->bsg_dev);
1457                 device_unregister(&sdev->sdev_dev);
1458                 transport_remove_device(dev);
1459                 device_del(dev);
1460         } else
1461                 put_device(&sdev->sdev_dev);
1462
1463         /*
1464          * Stop accepting new requests and wait until all queuecommand() and
1465          * scsi_run_queue() invocations have finished before tearing down the
1466          * device.
1467          */
1468         mutex_lock(&sdev->state_mutex);
1469         scsi_device_set_state(sdev, SDEV_DEL);
1470         mutex_unlock(&sdev->state_mutex);
1471
1472         blk_mq_destroy_queue(sdev->request_queue);
1473         cancel_work_sync(&sdev->requeue_work);
1474
1475         if (sdev->host->hostt->slave_destroy)
1476                 sdev->host->hostt->slave_destroy(sdev);
1477         transport_destroy_device(dev);
1478
1479         /*
1480          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1481          * removed sysfs visibility from the device, so make the target
1482          * invisible if this was the last device underneath it.
1483          */
1484         scsi_target_reap(scsi_target(sdev));
1485
1486         put_device(dev);
1487 }
1488
1489 /**
1490  * scsi_remove_device - unregister a device from the scsi bus
1491  * @sdev:       scsi_device to unregister
1492  **/
1493 void scsi_remove_device(struct scsi_device *sdev)
1494 {
1495         struct Scsi_Host *shost = sdev->host;
1496
1497         mutex_lock(&shost->scan_mutex);
1498         __scsi_remove_device(sdev);
1499         mutex_unlock(&shost->scan_mutex);
1500 }
1501 EXPORT_SYMBOL(scsi_remove_device);
1502
1503 static void __scsi_remove_target(struct scsi_target *starget)
1504 {
1505         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1506         unsigned long flags;
1507         struct scsi_device *sdev;
1508
1509         spin_lock_irqsave(shost->host_lock, flags);
1510  restart:
1511         list_for_each_entry(sdev, &shost->__devices, siblings) {
1512                 /*
1513                  * We cannot call scsi_device_get() here, as
1514                  * we might've been called from rmmod() causing
1515                  * scsi_device_get() to fail the module_is_live()
1516                  * check.
1517                  */
1518                 if (sdev->channel != starget->channel ||
1519                     sdev->id != starget->id)
1520                         continue;
1521                 if (sdev->sdev_state == SDEV_DEL ||
1522                     sdev->sdev_state == SDEV_CANCEL ||
1523                     !get_device(&sdev->sdev_gendev))
1524                         continue;
1525                 spin_unlock_irqrestore(shost->host_lock, flags);
1526                 scsi_remove_device(sdev);
1527                 put_device(&sdev->sdev_gendev);
1528                 spin_lock_irqsave(shost->host_lock, flags);
1529                 goto restart;
1530         }
1531         spin_unlock_irqrestore(shost->host_lock, flags);
1532
1533         /*
1534          * After scsi_remove_target() returns its caller can remove resources
1535          * associated with @starget, e.g. an rport or session. Wait until all
1536          * devices associated with @starget have been removed to prevent that
1537          * a SCSI error handling callback function triggers a use-after-free.
1538          */
1539         wait_event(starget->sdev_wq, atomic_read(&starget->sdev_count) == 0);
1540 }
1541
1542 /**
1543  * scsi_remove_target - try to remove a target and all its devices
1544  * @dev: generic starget or parent of generic stargets to be removed
1545  *
1546  * Note: This is slightly racy.  It is possible that if the user
1547  * requests the addition of another device then the target won't be
1548  * removed.
1549  */
1550 void scsi_remove_target(struct device *dev)
1551 {
1552         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1553         struct scsi_target *starget;
1554         unsigned long flags;
1555
1556 restart:
1557         spin_lock_irqsave(shost->host_lock, flags);
1558         list_for_each_entry(starget, &shost->__targets, siblings) {
1559                 if (starget->state == STARGET_DEL ||
1560                     starget->state == STARGET_REMOVE ||
1561                     starget->state == STARGET_CREATED_REMOVE)
1562                         continue;
1563                 if (starget->dev.parent == dev || &starget->dev == dev) {
1564                         kref_get(&starget->reap_ref);
1565                         if (starget->state == STARGET_CREATED)
1566                                 starget->state = STARGET_CREATED_REMOVE;
1567                         else
1568                                 starget->state = STARGET_REMOVE;
1569                         spin_unlock_irqrestore(shost->host_lock, flags);
1570                         __scsi_remove_target(starget);
1571                         scsi_target_reap(starget);
1572                         goto restart;
1573                 }
1574         }
1575         spin_unlock_irqrestore(shost->host_lock, flags);
1576 }
1577 EXPORT_SYMBOL(scsi_remove_target);
1578
1579 int scsi_register_driver(struct device_driver *drv)
1580 {
1581         drv->bus = &scsi_bus_type;
1582
1583         return driver_register(drv);
1584 }
1585 EXPORT_SYMBOL(scsi_register_driver);
1586
1587 int scsi_register_interface(struct class_interface *intf)
1588 {
1589         intf->class = &sdev_class;
1590
1591         return class_interface_register(intf);
1592 }
1593 EXPORT_SYMBOL(scsi_register_interface);
1594
1595 /**
1596  * scsi_sysfs_add_host - add scsi host to subsystem
1597  * @shost:     scsi host struct to add to subsystem
1598  **/
1599 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1600 {
1601         transport_register_device(&shost->shost_gendev);
1602         transport_configure_device(&shost->shost_gendev);
1603         return 0;
1604 }
1605
1606 static struct device_type scsi_dev_type = {
1607         .name =         "scsi_device",
1608         .release =      scsi_device_dev_release,
1609         .groups =       scsi_sdev_attr_groups,
1610 };
1611
1612 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1613 {
1614         unsigned long flags;
1615         struct Scsi_Host *shost = sdev->host;
1616         struct scsi_host_template *hostt = shost->hostt;
1617         struct scsi_target  *starget = sdev->sdev_target;
1618
1619         device_initialize(&sdev->sdev_gendev);
1620         sdev->sdev_gendev.bus = &scsi_bus_type;
1621         sdev->sdev_gendev.type = &scsi_dev_type;
1622         scsi_enable_async_suspend(&sdev->sdev_gendev);
1623         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1624                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1625         sdev->sdev_gendev.groups = hostt->sdev_groups;
1626
1627         device_initialize(&sdev->sdev_dev);
1628         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1629         sdev->sdev_dev.class = &sdev_class;
1630         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1631                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1632         /*
1633          * Get a default scsi_level from the target (derived from sibling
1634          * devices).  This is the best we can do for guessing how to set
1635          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1636          * setting doesn't matter, because all the bits are zero anyway.
1637          * But it does matter for higher LUNs.
1638          */
1639         sdev->scsi_level = starget->scsi_level;
1640         if (sdev->scsi_level <= SCSI_2 &&
1641                         sdev->scsi_level != SCSI_UNKNOWN &&
1642                         !shost->no_scsi2_lun_in_cdb)
1643                 sdev->lun_in_cdb = 1;
1644
1645         transport_setup_device(&sdev->sdev_gendev);
1646         spin_lock_irqsave(shost->host_lock, flags);
1647         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1648         list_add_tail(&sdev->siblings, &shost->__devices);
1649         spin_unlock_irqrestore(shost->host_lock, flags);
1650
1651         atomic_inc(&starget->sdev_count);
1652
1653         /*
1654          * device can now only be removed via __scsi_remove_device() so hold
1655          * the target.  Target will be held in CREATED state until something
1656          * beneath it becomes visible (in which case it moves to RUNNING)
1657          */
1658         kref_get(&starget->reap_ref);
1659 }
1660
1661 int scsi_is_sdev_device(const struct device *dev)
1662 {
1663         return dev->type == &scsi_dev_type;
1664 }
1665 EXPORT_SYMBOL(scsi_is_sdev_device);
1666
1667 /* A blank transport template that is used in drivers that don't
1668  * yet implement Transport Attributes */
1669 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };