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 const struct attribute_group scsi_shost_attr_group = {
 428         .attrs =        scsi_sysfs_shost_attrs,
 429 };
 430
 431 static void scsi_device_cls_release(struct device *class_dev)
 432 {
 433         struct scsi_device *sdev;
 434
 435         sdev = class_to_sdev(class_dev);
 436         put_device(&sdev->sdev_gendev);
 437 }
 438
 439 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 440 {
 441         struct scsi_device *sdev;
 442         struct device *parent;
 443         struct list_head *this, *tmp;
 444         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 445         struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
 446         unsigned long flags;
 447         struct module *mod;
 448
 449         sdev = container_of(work, struct scsi_device, ew.work);
 450
 451         mod = sdev->host->hostt->module;
 452
 453         scsi_dh_release_device(sdev);
 454
 455         parent = sdev->sdev_gendev.parent;
 456
 457         spin_lock_irqsave(sdev->host->host_lock, flags);
 458         list_del(&sdev->siblings);
 459         list_del(&sdev->same_target_siblings);
 460         list_del(&sdev->starved_entry);
 461         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 462
 463         cancel_work_sync(&sdev->event_work);
 464
 465         list_for_each_safe(this, tmp, &sdev->event_list) {
 466                 struct scsi_event *evt;
 467
 468                 evt = list_entry(this, struct scsi_event, node);
 469                 list_del(&evt->node);
 470                 kfree(evt);
 471         }
 472
 473         blk_put_queue(sdev->request_queue);
 474         /* NULL queue means the device can't be used */
 475         sdev->request_queue = NULL;
 476
 477         sbitmap_free(&sdev->budget_map);
 478
 479         mutex_lock(&sdev->inquiry_mutex);
 480         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 481                                        lockdep_is_held(&sdev->inquiry_mutex));
 482         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 483                                        lockdep_is_held(&sdev->inquiry_mutex));
 484         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 485                                        lockdep_is_held(&sdev->inquiry_mutex));
 486         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 487                                        lockdep_is_held(&sdev->inquiry_mutex));
 488         mutex_unlock(&sdev->inquiry_mutex);
 489
 490         if (vpd_pg0)
 491                 kfree_rcu(vpd_pg0, rcu);
 492         if (vpd_pg83)
 493                 kfree_rcu(vpd_pg83, rcu);
 494         if (vpd_pg80)
 495                 kfree_rcu(vpd_pg80, rcu);
 496         if (vpd_pg89)
 497                 kfree_rcu(vpd_pg89, rcu);
 498         kfree(sdev->inquiry);
 499         kfree(sdev);
 500
 501         if (parent)
 502                 put_device(parent);
 503         module_put(mod);
 504 }
 505
 506 static void scsi_device_dev_release(struct device *dev)
 507 {
 508         struct scsi_device *sdp = to_scsi_device(dev);
 509
 510         /* Set module pointer as NULL in case of module unloading */
 511         if (!try_module_get(sdp->host->hostt->module))
 512                 sdp->host->hostt->module = NULL;
 513
 514         execute_in_process_context(scsi_device_dev_release_usercontext,
 515                                    &sdp->ew);
 516 }
 517
 518 static struct class sdev_class = {
 519         .name           = "scsi_device",
 520         .dev_release    = scsi_device_cls_release,
 521 };
 522
 523 /* all probing is done in the individual ->probe routines */
 524 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 525 {
 526         struct scsi_device *sdp;
 527
 528         if (dev->type != &scsi_dev_type)
 529                 return 0;
 530
 531         sdp = to_scsi_device(dev);
 532         if (sdp->no_uld_attach)
 533                 return 0;
 534         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 535 }
 536
 537 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 538 {
 539         struct scsi_device *sdev;
 540
 541         if (dev->type != &scsi_dev_type)
 542                 return 0;
 543
 544         sdev = to_scsi_device(dev);
 545
 546         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 547         return 0;
 548 }
 549
 550 struct bus_type scsi_bus_type = {
 551         .name           = "scsi",
 552         .match          = scsi_bus_match,
 553         .uevent         = scsi_bus_uevent,
 554 #ifdef CONFIG_PM
 555         .pm             = &scsi_bus_pm_ops,
 556 #endif
 557 };
 558 EXPORT_SYMBOL_GPL(scsi_bus_type);
 559
 560 int scsi_sysfs_register(void)
 561 {
 562         int error;
 563
 564         error = bus_register(&scsi_bus_type);
 565         if (!error) {
 566                 error = class_register(&sdev_class);
 567                 if (error)
 568                         bus_unregister(&scsi_bus_type);
 569         }
 570
 571         return error;
 572 }
 573
 574 void scsi_sysfs_unregister(void)
 575 {
 576         class_unregister(&sdev_class);
 577         bus_unregister(&scsi_bus_type);
 578 }
 579
 580 /*
 581  * sdev_show_function: macro to create an attr function that can be used to
 582  * show a non-bit field.
 583  */
 584 #define sdev_show_function(field, format_string)                                \
 585 static ssize_t                                                          \
 586 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 587                    char *buf)                                           \
 588 {                                                                       \
 589         struct scsi_device *sdev;                                       \
 590         sdev = to_scsi_device(dev);                                     \
 591         return snprintf (buf, 20, format_string, sdev->field);          \
 592 }                                                                       \
 593
 594 /*
 595  * sdev_rd_attr: macro to create a function and attribute variable for a
 596  * read only field.
 597  */
 598 #define sdev_rd_attr(field, format_string)                              \
 599         sdev_show_function(field, format_string)                        \
 600 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 601
 602
 603 /*
 604  * sdev_rw_attr: create a function and attribute variable for a
 605  * read/write field.
 606  */
 607 #define sdev_rw_attr(field, format_string)                              \
 608         sdev_show_function(field, format_string)                                \
 609                                                                         \
 610 static ssize_t                                                          \
 611 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 612                     const char *buf, size_t count)                      \
 613 {                                                                       \
 614         struct scsi_device *sdev;                                       \
 615         sdev = to_scsi_device(dev);                                     \
 616         sscanf (buf, format_string, &sdev->field);                      \
 617         return count;                                                   \
 618 }                                                                       \
 619 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 620
 621 /* Currently we don't export bit fields, but we might in future,
 622  * so leave this code in */
 623 #if 0
 624 /*
 625  * sdev_rd_attr: create a function and attribute variable for a
 626  * read/write bit field.
 627  */
 628 #define sdev_rw_attr_bit(field)                                         \
 629         sdev_show_function(field, "%d\n")                                       \
 630                                                                         \
 631 static ssize_t                                                          \
 632 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 633                     const char *buf, size_t count)                      \
 634 {                                                                       \
 635         int ret;                                                        \
 636         struct scsi_device *sdev;                                       \
 637         ret = scsi_sdev_check_buf_bit(buf);                             \
 638         if (ret >= 0)   {                                               \
 639                 sdev = to_scsi_device(dev);                             \
 640                 sdev->field = ret;                                      \
 641                 ret = count;                                            \
 642         }                                                               \
 643         return ret;                                                     \
 644 }                                                                       \
 645 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 646
 647 /*
 648  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 649  * else return -EINVAL.
 650  */
 651 static int scsi_sdev_check_buf_bit(const char *buf)
 652 {
 653         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 654                 if (buf[0] == '1')
 655                         return 1;
 656                 else if (buf[0] == '0')
 657                         return 0;
 658                 else
 659                         return -EINVAL;
 660         } else
 661                 return -EINVAL;
 662 }
 663 #endif
 664 /*
 665  * Create the actual show/store functions and data structures.
 666  */
 667 sdev_rd_attr (type, "%d\n");
 668 sdev_rd_attr (scsi_level, "%d\n");
 669 sdev_rd_attr (vendor, "%.8s\n");
 670 sdev_rd_attr (model, "%.16s\n");
 671 sdev_rd_attr (rev, "%.4s\n");
 672
 673 static ssize_t
 674 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 675                 char *buf)
 676 {
 677         struct scsi_device *sdev = to_scsi_device(dev);
 678         return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 679 }
 680 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 681
 682 static ssize_t
 683 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 684                 char *buf)
 685 {
 686         struct scsi_device *sdev = to_scsi_device(dev);
 687         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 688 }
 689 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 690
 691 /*
 692  * TODO: can we make these symlinks to the block layer ones?
 693  */
 694 static ssize_t
 695 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 696 {
 697         struct scsi_device *sdev;
 698         sdev = to_scsi_device(dev);
 699         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 700 }
 701
 702 static ssize_t
 703 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 704                     const char *buf, size_t count)
 705 {
 706         struct scsi_device *sdev;
 707         int timeout;
 708         sdev = to_scsi_device(dev);
 709         sscanf (buf, "%d\n", &timeout);
 710         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 711         return count;
 712 }
 713 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 714
 715 static ssize_t
 716 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 717 {
 718         struct scsi_device *sdev;
 719         sdev = to_scsi_device(dev);
 720         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 721 }
 722
 723 static ssize_t
 724 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 725                     const char *buf, size_t count)
 726 {
 727         struct scsi_device *sdev;
 728         unsigned int eh_timeout;
 729         int err;
 730
 731         if (!capable(CAP_SYS_ADMIN))
 732                 return -EACCES;
 733
 734         sdev = to_scsi_device(dev);
 735         err = kstrtouint(buf, 10, &eh_timeout);
 736         if (err)
 737                 return err;
 738         sdev->eh_timeout = eh_timeout * HZ;
 739
 740         return count;
 741 }
 742 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 743
 744 static ssize_t
 745 store_rescan_field (struct device *dev, struct device_attribute *attr,
 746                     const char *buf, size_t count)
 747 {
 748         scsi_rescan_device(dev);
 749         return count;
 750 }
 751 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 752
 753 static ssize_t
 754 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 755                   const char *buf, size_t count)
 756 {
 757         struct kernfs_node *kn;
 758         struct scsi_device *sdev = to_scsi_device(dev);
 759
 760         /*
 761          * We need to try to get module, avoiding the module been removed
 762          * during delete.
 763          */
 764         if (scsi_device_get(sdev))
 765                 return -ENODEV;
 766
 767         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 768         WARN_ON_ONCE(!kn);
 769         /*
 770          * Concurrent writes into the "delete" sysfs attribute may trigger
 771          * concurrent calls to device_remove_file() and scsi_remove_device().
 772          * device_remove_file() handles concurrent removal calls by
 773          * serializing these and by ignoring the second and later removal
 774          * attempts.  Concurrent calls of scsi_remove_device() are
 775          * serialized. The second and later calls of scsi_remove_device() are
 776          * ignored because the first call of that function changes the device
 777          * state into SDEV_DEL.
 778          */
 779         device_remove_file(dev, attr);
 780         scsi_remove_device(sdev);
 781         if (kn)
 782                 sysfs_unbreak_active_protection(kn);
 783         scsi_device_put(sdev);
 784         return count;
 785 };
 786 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 787
 788 static ssize_t
 789 store_state_field(struct device *dev, struct device_attribute *attr,
 790                   const char *buf, size_t count)
 791 {
 792         int i, ret;
 793         struct scsi_device *sdev = to_scsi_device(dev);
 794         enum scsi_device_state state = 0;
 795
 796         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 797                 const int len = strlen(sdev_states[i].name);
 798                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 799                    buf[len] == '\n') {
 800                         state = sdev_states[i].value;
 801                         break;
 802                 }
 803         }
 804         switch (state) {
 805         case SDEV_RUNNING:
 806         case SDEV_OFFLINE:
 807                 break;
 808         default:
 809                 return -EINVAL;
 810         }
 811
 812         mutex_lock(&sdev->state_mutex);
 813         ret = scsi_device_set_state(sdev, state);
 814         /*
 815          * If the device state changes to SDEV_RUNNING, we need to
 816          * run the queue to avoid I/O hang, and rescan the device
 817          * to revalidate it. Running the queue first is necessary
 818          * because another thread may be waiting inside
 819          * blk_mq_freeze_queue_wait() and because that call may be
 820          * waiting for pending I/O to finish.
 821          */
 822         if (ret == 0 && state == SDEV_RUNNING) {
 823                 blk_mq_run_hw_queues(sdev->request_queue, true);
 824                 scsi_rescan_device(dev);
 825         }
 826         mutex_unlock(&sdev->state_mutex);
 827
 828         return ret == 0 ? count : -EINVAL;
 829 }
 830
 831 static ssize_t
 832 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 833 {
 834         struct scsi_device *sdev = to_scsi_device(dev);
 835         const char *name = scsi_device_state_name(sdev->sdev_state);
 836
 837         if (!name)
 838                 return -EINVAL;
 839
 840         return snprintf(buf, 20, "%s\n", name);
 841 }
 842
 843 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 844
 845 static ssize_t
 846 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 847                       char *buf)
 848 {
 849         struct scsi_device *sdev = to_scsi_device(dev);
 850         const char *name = "none";
 851
 852         if (sdev->simple_tags)
 853                 name = "simple";
 854
 855         return snprintf(buf, 20, "%s\n", name);
 856 }
 857
 858 static ssize_t
 859 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 860                        const char *buf, size_t count)
 861 {
 862         struct scsi_device *sdev = to_scsi_device(dev);
 863
 864         if (!sdev->tagged_supported)
 865                 return -EINVAL;
 866
 867         sdev_printk(KERN_INFO, sdev,
 868                     "ignoring write to deprecated queue_type attribute");
 869         return count;
 870 }
 871
 872 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 873                    store_queue_type_field);
 874
 875 #define sdev_vpd_pg_attr(_page)                                         \
 876 static ssize_t                                                  \
 877 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 878                  struct bin_attribute *bin_attr,                        \
 879                  char *buf, loff_t off, size_t count)                   \
 880 {                                                                       \
 881         struct device *dev = kobj_to_dev(kobj);                         \
 882         struct scsi_device *sdev = to_scsi_device(dev);                 \
 883         struct scsi_vpd *vpd_page;                                      \
 884         int ret = -EINVAL;                                              \
 885                                                                         \
 886         rcu_read_lock();                                                \
 887         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 888         if (vpd_page)                                                   \
 889                 ret = memory_read_from_buffer(buf, count, &off,         \
 890                                 vpd_page->data, vpd_page->len);         \
 891         rcu_read_unlock();                                              \
 892         return ret;                                                     \
 893 }                                                                       \
 894 static struct bin_attribute dev_attr_vpd_##_page = {            \
 895         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 896         .size = 0,                                                      \
 897         .read = show_vpd_##_page,                                       \
 898 };
 899
 900 sdev_vpd_pg_attr(pg83);
 901 sdev_vpd_pg_attr(pg80);
 902 sdev_vpd_pg_attr(pg89);
 903 sdev_vpd_pg_attr(pg0);
 904
 905 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 906                             struct bin_attribute *bin_attr,
 907                             char *buf, loff_t off, size_t count)
 908 {
 909         struct device *dev = kobj_to_dev(kobj);
 910         struct scsi_device *sdev = to_scsi_device(dev);
 911
 912         if (!sdev->inquiry)
 913                 return -EINVAL;
 914
 915         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 916                                        sdev->inquiry_len);
 917 }
 918
 919 static struct bin_attribute dev_attr_inquiry = {
 920         .attr = {
 921                 .name = "inquiry",
 922                 .mode = S_IRUGO,
 923         },
 924         .size = 0,
 925         .read = show_inquiry,
 926 };
 927
 928 static ssize_t
 929 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 930                         char *buf)
 931 {
 932         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 933 }
 934
 935 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 936
 937 #define show_sdev_iostat(field)                                         \
 938 static ssize_t                                                          \
 939 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 940                     char *buf)                                          \
 941 {                                                                       \
 942         struct scsi_device *sdev = to_scsi_device(dev);                 \
 943         unsigned long long count = atomic_read(&sdev->field);           \
 944         return snprintf(buf, 20, "0x%llx\n", count);                    \
 945 }                                                                       \
 946 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 947
 948 show_sdev_iostat(iorequest_cnt);
 949 show_sdev_iostat(iodone_cnt);
 950 show_sdev_iostat(ioerr_cnt);
 951
 952 static ssize_t
 953 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 954 {
 955         struct scsi_device *sdev;
 956         sdev = to_scsi_device(dev);
 957         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 958 }
 959 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 960
 961 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 962 static ssize_t                                                          \
 963 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 964                      char *buf)                                         \
 965 {                                                                       \
 966         struct scsi_device *sdev = to_scsi_device(dev);                 \
 967         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 968         return snprintf(buf, 20, "%d\n", val);                          \
 969 }
 970
 971 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 972 static ssize_t                                                          \
 973 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 974                       const char *buf, size_t count)                    \
 975 {                                                                       \
 976         struct scsi_device *sdev = to_scsi_device(dev);                 \
 977         int val = simple_strtoul(buf, NULL, 0);                         \
 978         if (val == 0)                                                   \
 979                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 980         else if (val == 1)                                              \
 981                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 982         else                                                            \
 983                 return -EINVAL;                                         \
 984         return count;                                                   \
 985 }
 986
 987 #define DECLARE_EVT(name, Cap_name)                                     \
 988         DECLARE_EVT_SHOW(name, Cap_name)                                \
 989         DECLARE_EVT_STORE(name, Cap_name)                               \
 990         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 991                            sdev_store_evt_##name);
 992 #define REF_EVT(name) &dev_attr_evt_##name.attr
 993
 994 DECLARE_EVT(media_change, MEDIA_CHANGE)
 995 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 996 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 997 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 998 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 999 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1000
1001 static ssize_t
1002 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1003                        const char *buf, size_t count)
1004 {
1005         int depth, retval;
1006         struct scsi_device *sdev = to_scsi_device(dev);
1007         struct scsi_host_template *sht = sdev->host->hostt;
1008
1009         if (!sht->change_queue_depth)
1010                 return -EINVAL;
1011
1012         depth = simple_strtoul(buf, NULL, 0);
1013
1014         if (depth < 1 || depth > sdev->host->can_queue)
1015                 return -EINVAL;
1016
1017         retval = sht->change_queue_depth(sdev, depth);
1018         if (retval < 0)
1019                 return retval;
1020
1021         sdev->max_queue_depth = sdev->queue_depth;
1022
1023         return count;
1024 }
1025 sdev_show_function(queue_depth, "%d\n");
1026
1027 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1028                    sdev_store_queue_depth);
1029
1030 static ssize_t
1031 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1032                     char *buf)
1033 {
1034         struct scsi_device *sdev = to_scsi_device(dev);
1035         ssize_t count;
1036
1037         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1038         if (count > 0) {
1039                 buf[count] = '\n';
1040                 count++;
1041         }
1042         return count;
1043 }
1044 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1045
1046 #define BLIST_FLAG_NAME(name)                                   \
1047         [const_ilog2((__force __u64)BLIST_##name)] = #name
1048 static const char *const sdev_bflags_name[] = {
1049 #include "scsi_devinfo_tbl.c"
1050 };
1051 #undef BLIST_FLAG_NAME
1052
1053 static ssize_t
1054 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1055                     char *buf)
1056 {
1057         struct scsi_device *sdev = to_scsi_device(dev);
1058         int i;
1059         ssize_t len = 0;
1060
1061         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1062                 const char *name = NULL;
1063
1064                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1065                         continue;
1066                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1067                         name = sdev_bflags_name[i];
1068
1069                 if (name)
1070                         len += scnprintf(buf + len, PAGE_SIZE - len,
1071                                          "%s%s", len ? " " : "", name);
1072                 else
1073                         len += scnprintf(buf + len, PAGE_SIZE - len,
1074                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1075         }
1076         if (len)
1077                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1078         return len;
1079 }
1080 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1081
1082 #ifdef CONFIG_SCSI_DH
1083 static ssize_t
1084 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1085                    char *buf)
1086 {
1087         struct scsi_device *sdev = to_scsi_device(dev);
1088
1089         if (!sdev->handler)
1090                 return snprintf(buf, 20, "detached\n");
1091
1092         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1093 }
1094
1095 static ssize_t
1096 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1097                     const char *buf, size_t count)
1098 {
1099         struct scsi_device *sdev = to_scsi_device(dev);
1100         int err = -EINVAL;
1101
1102         if (sdev->sdev_state == SDEV_CANCEL ||
1103             sdev->sdev_state == SDEV_DEL)
1104                 return -ENODEV;
1105
1106         if (!sdev->handler) {
1107                 /*
1108                  * Attach to a device handler
1109                  */
1110                 err = scsi_dh_attach(sdev->request_queue, buf);
1111         } else if (!strncmp(buf, "activate", 8)) {
1112                 /*
1113                  * Activate a device handler
1114                  */
1115                 if (sdev->handler->activate)
1116                         err = sdev->handler->activate(sdev, NULL, NULL);
1117                 else
1118                         err = 0;
1119         } else if (!strncmp(buf, "detach", 6)) {
1120                 /*
1121                  * Detach from a device handler
1122                  */
1123                 sdev_printk(KERN_WARNING, sdev,
1124                             "can't detach handler %s.\n",
1125                             sdev->handler->name);
1126                 err = -EINVAL;
1127         }
1128
1129         return err < 0 ? err : count;
1130 }
1131
1132 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1133                    sdev_store_dh_state);
1134
1135 static ssize_t
1136 sdev_show_access_state(struct device *dev,
1137                        struct device_attribute *attr,
1138                        char *buf)
1139 {
1140         struct scsi_device *sdev = to_scsi_device(dev);
1141         unsigned char access_state;
1142         const char *access_state_name;
1143
1144         if (!sdev->handler)
1145                 return -EINVAL;
1146
1147         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1148         access_state_name = scsi_access_state_name(access_state);
1149
1150         return sprintf(buf, "%s\n",
1151                        access_state_name ? access_state_name : "unknown");
1152 }
1153 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1154
1155 static ssize_t
1156 sdev_show_preferred_path(struct device *dev,
1157                          struct device_attribute *attr,
1158                          char *buf)
1159 {
1160         struct scsi_device *sdev = to_scsi_device(dev);
1161
1162         if (!sdev->handler)
1163                 return -EINVAL;
1164
1165         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1166                 return sprintf(buf, "1\n");
1167         else
1168                 return sprintf(buf, "0\n");
1169 }
1170 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1171 #endif
1172
1173 static ssize_t
1174 sdev_show_queue_ramp_up_period(struct device *dev,
1175                                struct device_attribute *attr,
1176                                char *buf)
1177 {
1178         struct scsi_device *sdev;
1179         sdev = to_scsi_device(dev);
1180         return snprintf(buf, 20, "%u\n",
1181                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1182 }
1183
1184 static ssize_t
1185 sdev_store_queue_ramp_up_period(struct device *dev,
1186                                 struct device_attribute *attr,
1187                                 const char *buf, size_t count)
1188 {
1189         struct scsi_device *sdev = to_scsi_device(dev);
1190         unsigned int period;
1191
1192         if (kstrtouint(buf, 10, &period))
1193                 return -EINVAL;
1194
1195         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1196         return count;
1197 }
1198
1199 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1200                    sdev_show_queue_ramp_up_period,
1201                    sdev_store_queue_ramp_up_period);
1202
1203 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1204                                          struct attribute *attr, int i)
1205 {
1206         struct device *dev = kobj_to_dev(kobj);
1207         struct scsi_device *sdev = to_scsi_device(dev);
1208
1209
1210         if (attr == &dev_attr_queue_depth.attr &&
1211             !sdev->host->hostt->change_queue_depth)
1212                 return S_IRUGO;
1213
1214         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1215             !sdev->host->hostt->change_queue_depth)
1216                 return 0;
1217
1218 #ifdef CONFIG_SCSI_DH
1219         if (attr == &dev_attr_access_state.attr &&
1220             !sdev->handler)
1221                 return 0;
1222         if (attr == &dev_attr_preferred_path.attr &&
1223             !sdev->handler)
1224                 return 0;
1225 #endif
1226         return attr->mode;
1227 }
1228
1229 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1230                                              struct bin_attribute *attr, int i)
1231 {
1232         struct device *dev = kobj_to_dev(kobj);
1233         struct scsi_device *sdev = to_scsi_device(dev);
1234
1235
1236         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1237                 return 0;
1238
1239         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1240                 return 0;
1241
1242         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1243                 return 0;
1244
1245         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1246                 return 0;
1247
1248         return S_IRUGO;
1249 }
1250
1251 /* Default template for device attributes.  May NOT be modified */
1252 static struct attribute *scsi_sdev_attrs[] = {
1253         &dev_attr_device_blocked.attr,
1254         &dev_attr_type.attr,
1255         &dev_attr_scsi_level.attr,
1256         &dev_attr_device_busy.attr,
1257         &dev_attr_vendor.attr,
1258         &dev_attr_model.attr,
1259         &dev_attr_rev.attr,
1260         &dev_attr_rescan.attr,
1261         &dev_attr_delete.attr,
1262         &dev_attr_state.attr,
1263         &dev_attr_timeout.attr,
1264         &dev_attr_eh_timeout.attr,
1265         &dev_attr_iocounterbits.attr,
1266         &dev_attr_iorequest_cnt.attr,
1267         &dev_attr_iodone_cnt.attr,
1268         &dev_attr_ioerr_cnt.attr,
1269         &dev_attr_modalias.attr,
1270         &dev_attr_queue_depth.attr,
1271         &dev_attr_queue_type.attr,
1272         &dev_attr_wwid.attr,
1273         &dev_attr_blacklist.attr,
1274 #ifdef CONFIG_SCSI_DH
1275         &dev_attr_dh_state.attr,
1276         &dev_attr_access_state.attr,
1277         &dev_attr_preferred_path.attr,
1278 #endif
1279         &dev_attr_queue_ramp_up_period.attr,
1280         REF_EVT(media_change),
1281         REF_EVT(inquiry_change_reported),
1282         REF_EVT(capacity_change_reported),
1283         REF_EVT(soft_threshold_reached),
1284         REF_EVT(mode_parameter_change_reported),
1285         REF_EVT(lun_change_reported),
1286         NULL
1287 };
1288
1289 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1290         &dev_attr_vpd_pg0,
1291         &dev_attr_vpd_pg83,
1292         &dev_attr_vpd_pg80,
1293         &dev_attr_vpd_pg89,
1294         &dev_attr_inquiry,
1295         NULL
1296 };
1297 static struct attribute_group scsi_sdev_attr_group = {
1298         .attrs =        scsi_sdev_attrs,
1299         .bin_attrs =    scsi_sdev_bin_attrs,
1300         .is_visible =   scsi_sdev_attr_is_visible,
1301         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1302 };
1303
1304 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1305         &scsi_sdev_attr_group,
1306         NULL
1307 };
1308
1309 static int scsi_target_add(struct scsi_target *starget)
1310 {
1311         int error;
1312
1313         if (starget->state != STARGET_CREATED)
1314                 return 0;
1315
1316         error = device_add(&starget->dev);
1317         if (error) {
1318                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1319                 return error;
1320         }
1321         transport_add_device(&starget->dev);
1322         starget->state = STARGET_RUNNING;
1323
1324         pm_runtime_set_active(&starget->dev);
1325         pm_runtime_enable(&starget->dev);
1326         device_enable_async_suspend(&starget->dev);
1327
1328         return 0;
1329 }
1330
1331 /**
1332  * scsi_sysfs_add_sdev - add scsi device to sysfs
1333  * @sdev:       scsi_device to add
1334  *
1335  * Return value:
1336  *      0 on Success / non-zero on Failure
1337  **/
1338 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1339 {
1340         int error;
1341         struct scsi_target *starget = sdev->sdev_target;
1342
1343         error = scsi_target_add(starget);
1344         if (error)
1345                 return error;
1346
1347         transport_configure_device(&starget->dev);
1348
1349         device_enable_async_suspend(&sdev->sdev_gendev);
1350         scsi_autopm_get_target(starget);
1351         pm_runtime_set_active(&sdev->sdev_gendev);
1352         if (!sdev->rpm_autosuspend)
1353                 pm_runtime_forbid(&sdev->sdev_gendev);
1354         pm_runtime_enable(&sdev->sdev_gendev);
1355         scsi_autopm_put_target(starget);
1356
1357         scsi_autopm_get_device(sdev);
1358
1359         scsi_dh_add_device(sdev);
1360
1361         error = device_add(&sdev->sdev_gendev);
1362         if (error) {
1363                 sdev_printk(KERN_INFO, sdev,
1364                                 "failed to add device: %d\n", error);
1365                 return error;
1366         }
1367
1368         device_enable_async_suspend(&sdev->sdev_dev);
1369         error = device_add(&sdev->sdev_dev);
1370         if (error) {
1371                 sdev_printk(KERN_INFO, sdev,
1372                                 "failed to add class device: %d\n", error);
1373                 device_del(&sdev->sdev_gendev);
1374                 return error;
1375         }
1376         transport_add_device(&sdev->sdev_gendev);
1377         sdev->is_visible = 1;
1378
1379         if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1380                 sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1381                 if (IS_ERR(sdev->bsg_dev)) {
1382                         /*
1383                          * We're treating error on bsg register as non-fatal, so
1384                          * pretend nothing went wrong.
1385                          */
1386                         sdev_printk(KERN_INFO, sdev,
1387                                     "Failed to register bsg queue, errno=%d\n",
1388                                     error);
1389                         sdev->bsg_dev = NULL;
1390                 }
1391         }
1392
1393         scsi_autopm_put_device(sdev);
1394         return error;
1395 }
1396
1397 void __scsi_remove_device(struct scsi_device *sdev)
1398 {
1399         struct device *dev = &sdev->sdev_gendev;
1400         int res;
1401
1402         /*
1403          * This cleanup path is not reentrant and while it is impossible
1404          * to get a new reference with scsi_device_get() someone can still
1405          * hold a previously acquired one.
1406          */
1407         if (sdev->sdev_state == SDEV_DEL)
1408                 return;
1409
1410         if (sdev->is_visible) {
1411                 /*
1412                  * If scsi_internal_target_block() is running concurrently,
1413                  * wait until it has finished before changing the device state.
1414                  */
1415                 mutex_lock(&sdev->state_mutex);
1416                 /*
1417                  * If blocked, we go straight to DEL and restart the queue so
1418                  * any commands issued during driver shutdown (like sync
1419                  * cache) are errored immediately.
1420                  */
1421                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1422                 if (res != 0) {
1423                         res = scsi_device_set_state(sdev, SDEV_DEL);
1424                         if (res == 0)
1425                                 scsi_start_queue(sdev);
1426                 }
1427                 mutex_unlock(&sdev->state_mutex);
1428
1429                 if (res != 0)
1430                         return;
1431
1432                 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1433                         bsg_unregister_queue(sdev->bsg_dev);
1434                 device_unregister(&sdev->sdev_dev);
1435                 transport_remove_device(dev);
1436                 device_del(dev);
1437         } else
1438                 put_device(&sdev->sdev_dev);
1439
1440         /*
1441          * Stop accepting new requests and wait until all queuecommand() and
1442          * scsi_run_queue() invocations have finished before tearing down the
1443          * device.
1444          */
1445         mutex_lock(&sdev->state_mutex);
1446         scsi_device_set_state(sdev, SDEV_DEL);
1447         mutex_unlock(&sdev->state_mutex);
1448
1449         blk_cleanup_queue(sdev->request_queue);
1450         cancel_work_sync(&sdev->requeue_work);
1451
1452         if (sdev->host->hostt->slave_destroy)
1453                 sdev->host->hostt->slave_destroy(sdev);
1454         transport_destroy_device(dev);
1455
1456         /*
1457          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1458          * removed sysfs visibility from the device, so make the target
1459          * invisible if this was the last device underneath it.
1460          */
1461         scsi_target_reap(scsi_target(sdev));
1462
1463         put_device(dev);
1464 }
1465
1466 /**
1467  * scsi_remove_device - unregister a device from the scsi bus
1468  * @sdev:       scsi_device to unregister
1469  **/
1470 void scsi_remove_device(struct scsi_device *sdev)
1471 {
1472         struct Scsi_Host *shost = sdev->host;
1473
1474         mutex_lock(&shost->scan_mutex);
1475         __scsi_remove_device(sdev);
1476         mutex_unlock(&shost->scan_mutex);
1477 }
1478 EXPORT_SYMBOL(scsi_remove_device);
1479
1480 static void __scsi_remove_target(struct scsi_target *starget)
1481 {
1482         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1483         unsigned long flags;
1484         struct scsi_device *sdev;
1485
1486         spin_lock_irqsave(shost->host_lock, flags);
1487  restart:
1488         list_for_each_entry(sdev, &shost->__devices, siblings) {
1489                 /*
1490                  * We cannot call scsi_device_get() here, as
1491                  * we might've been called from rmmod() causing
1492                  * scsi_device_get() to fail the module_is_live()
1493                  * check.
1494                  */
1495                 if (sdev->channel != starget->channel ||
1496                     sdev->id != starget->id)
1497                         continue;
1498                 if (sdev->sdev_state == SDEV_DEL ||
1499                     sdev->sdev_state == SDEV_CANCEL ||
1500                     !get_device(&sdev->sdev_gendev))
1501                         continue;
1502                 spin_unlock_irqrestore(shost->host_lock, flags);
1503                 scsi_remove_device(sdev);
1504                 put_device(&sdev->sdev_gendev);
1505                 spin_lock_irqsave(shost->host_lock, flags);
1506                 goto restart;
1507         }
1508         spin_unlock_irqrestore(shost->host_lock, flags);
1509 }
1510
1511 /**
1512  * scsi_remove_target - try to remove a target and all its devices
1513  * @dev: generic starget or parent of generic stargets to be removed
1514  *
1515  * Note: This is slightly racy.  It is possible that if the user
1516  * requests the addition of another device then the target won't be
1517  * removed.
1518  */
1519 void scsi_remove_target(struct device *dev)
1520 {
1521         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1522         struct scsi_target *starget;
1523         unsigned long flags;
1524
1525 restart:
1526         spin_lock_irqsave(shost->host_lock, flags);
1527         list_for_each_entry(starget, &shost->__targets, siblings) {
1528                 if (starget->state == STARGET_DEL ||
1529                     starget->state == STARGET_REMOVE ||
1530                     starget->state == STARGET_CREATED_REMOVE)
1531                         continue;
1532                 if (starget->dev.parent == dev || &starget->dev == dev) {
1533                         kref_get(&starget->reap_ref);
1534                         if (starget->state == STARGET_CREATED)
1535                                 starget->state = STARGET_CREATED_REMOVE;
1536                         else
1537                                 starget->state = STARGET_REMOVE;
1538                         spin_unlock_irqrestore(shost->host_lock, flags);
1539                         __scsi_remove_target(starget);
1540                         scsi_target_reap(starget);
1541                         goto restart;
1542                 }
1543         }
1544         spin_unlock_irqrestore(shost->host_lock, flags);
1545 }
1546 EXPORT_SYMBOL(scsi_remove_target);
1547
1548 int scsi_register_driver(struct device_driver *drv)
1549 {
1550         drv->bus = &scsi_bus_type;
1551
1552         return driver_register(drv);
1553 }
1554 EXPORT_SYMBOL(scsi_register_driver);
1555
1556 int scsi_register_interface(struct class_interface *intf)
1557 {
1558         intf->class = &sdev_class;
1559
1560         return class_interface_register(intf);
1561 }
1562 EXPORT_SYMBOL(scsi_register_interface);
1563
1564 /**
1565  * scsi_sysfs_add_host - add scsi host to subsystem
1566  * @shost:     scsi host struct to add to subsystem
1567  **/
1568 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1569 {
1570         transport_register_device(&shost->shost_gendev);
1571         transport_configure_device(&shost->shost_gendev);
1572         return 0;
1573 }
1574
1575 static struct device_type scsi_dev_type = {
1576         .name =         "scsi_device",
1577         .release =      scsi_device_dev_release,
1578         .groups =       scsi_sdev_attr_groups,
1579 };
1580
1581 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1582 {
1583         int i, j = 0;
1584         unsigned long flags;
1585         struct Scsi_Host *shost = sdev->host;
1586         struct scsi_host_template *hostt = shost->hostt;
1587         struct scsi_target  *starget = sdev->sdev_target;
1588
1589         device_initialize(&sdev->sdev_gendev);
1590         sdev->sdev_gendev.bus = &scsi_bus_type;
1591         sdev->sdev_gendev.type = &scsi_dev_type;
1592         scsi_enable_async_suspend(&sdev->sdev_gendev);
1593         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1594                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1595         sdev->gendev_attr_groups[j++] = &scsi_sdev_attr_group;
1596         if (hostt->sdev_groups) {
1597                 for (i = 0; hostt->sdev_groups[i] &&
1598                              j < ARRAY_SIZE(sdev->gendev_attr_groups);
1599                      i++, j++) {
1600                         sdev->gendev_attr_groups[j] = hostt->sdev_groups[i];
1601                 }
1602         }
1603         WARN_ON_ONCE(j >= ARRAY_SIZE(sdev->gendev_attr_groups));
1604
1605         device_initialize(&sdev->sdev_dev);
1606         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1607         sdev->sdev_dev.class = &sdev_class;
1608         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1609                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1610         /*
1611          * Get a default scsi_level from the target (derived from sibling
1612          * devices).  This is the best we can do for guessing how to set
1613          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1614          * setting doesn't matter, because all the bits are zero anyway.
1615          * But it does matter for higher LUNs.
1616          */
1617         sdev->scsi_level = starget->scsi_level;
1618         if (sdev->scsi_level <= SCSI_2 &&
1619                         sdev->scsi_level != SCSI_UNKNOWN &&
1620                         !shost->no_scsi2_lun_in_cdb)
1621                 sdev->lun_in_cdb = 1;
1622
1623         transport_setup_device(&sdev->sdev_gendev);
1624         spin_lock_irqsave(shost->host_lock, flags);
1625         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1626         list_add_tail(&sdev->siblings, &shost->__devices);
1627         spin_unlock_irqrestore(shost->host_lock, flags);
1628         /*
1629          * device can now only be removed via __scsi_remove_device() so hold
1630          * the target.  Target will be held in CREATED state until something
1631          * beneath it becomes visible (in which case it moves to RUNNING)
1632          */
1633         kref_get(&starget->reap_ref);
1634 }
1635
1636 int scsi_is_sdev_device(const struct device *dev)
1637 {
1638         return dev->type == &scsi_dev_type;
1639 }
1640 EXPORT_SYMBOL(scsi_is_sdev_device);
1641
1642 /* A blank transport template that is used in drivers that don't
1643  * yet implement Transport Attributes */
1644 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };