drivers/scsi/scsi_sysfs.c

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