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         sbitmap_free(&sdev->budget_map);
 479
 480         mutex_lock(&sdev->inquiry_mutex);
 481         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 482                                        lockdep_is_held(&sdev->inquiry_mutex));
 483         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 484                                        lockdep_is_held(&sdev->inquiry_mutex));
 485         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 486                                        lockdep_is_held(&sdev->inquiry_mutex));
 487         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 488                                        lockdep_is_held(&sdev->inquiry_mutex));
 489         mutex_unlock(&sdev->inquiry_mutex);
 490
 491         if (vpd_pg0)
 492                 kfree_rcu(vpd_pg0, rcu);
 493         if (vpd_pg83)
 494                 kfree_rcu(vpd_pg83, rcu);
 495         if (vpd_pg80)
 496                 kfree_rcu(vpd_pg80, rcu);
 497         if (vpd_pg89)
 498                 kfree_rcu(vpd_pg89, rcu);
 499         kfree(sdev->inquiry);
 500         kfree(sdev);
 501
 502         if (parent)
 503                 put_device(parent);
 504 }
 505
 506 static void scsi_device_dev_release(struct device *dev)
 507 {
 508         struct scsi_device *sdp = to_scsi_device(dev);
 509         execute_in_process_context(scsi_device_dev_release_usercontext,
 510                                    &sdp->ew);
 511 }
 512
 513 static struct class sdev_class = {
 514         .name           = "scsi_device",
 515         .dev_release    = scsi_device_cls_release,
 516 };
 517
 518 /* all probing is done in the individual ->probe routines */
 519 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 520 {
 521         struct scsi_device *sdp;
 522
 523         if (dev->type != &scsi_dev_type)
 524                 return 0;
 525
 526         sdp = to_scsi_device(dev);
 527         if (sdp->no_uld_attach)
 528                 return 0;
 529         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 530 }
 531
 532 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 533 {
 534         struct scsi_device *sdev;
 535
 536         if (dev->type != &scsi_dev_type)
 537                 return 0;
 538
 539         sdev = to_scsi_device(dev);
 540
 541         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 542         return 0;
 543 }
 544
 545 struct bus_type scsi_bus_type = {
 546         .name           = "scsi",
 547         .match          = scsi_bus_match,
 548         .uevent         = scsi_bus_uevent,
 549 #ifdef CONFIG_PM
 550         .pm             = &scsi_bus_pm_ops,
 551 #endif
 552 };
 553 EXPORT_SYMBOL_GPL(scsi_bus_type);
 554
 555 int scsi_sysfs_register(void)
 556 {
 557         int error;
 558
 559         error = bus_register(&scsi_bus_type);
 560         if (!error) {
 561                 error = class_register(&sdev_class);
 562                 if (error)
 563                         bus_unregister(&scsi_bus_type);
 564         }
 565
 566         return error;
 567 }
 568
 569 void scsi_sysfs_unregister(void)
 570 {
 571         class_unregister(&sdev_class);
 572         bus_unregister(&scsi_bus_type);
 573 }
 574
 575 /*
 576  * sdev_show_function: macro to create an attr function that can be used to
 577  * show a non-bit field.
 578  */
 579 #define sdev_show_function(field, format_string)                                \
 580 static ssize_t                                                          \
 581 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 582                    char *buf)                                           \
 583 {                                                                       \
 584         struct scsi_device *sdev;                                       \
 585         sdev = to_scsi_device(dev);                                     \
 586         return snprintf (buf, 20, format_string, sdev->field);          \
 587 }                                                                       \
 588
 589 /*
 590  * sdev_rd_attr: macro to create a function and attribute variable for a
 591  * read only field.
 592  */
 593 #define sdev_rd_attr(field, format_string)                              \
 594         sdev_show_function(field, format_string)                        \
 595 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 596
 597
 598 /*
 599  * sdev_rw_attr: create a function and attribute variable for a
 600  * read/write field.
 601  */
 602 #define sdev_rw_attr(field, format_string)                              \
 603         sdev_show_function(field, format_string)                                \
 604                                                                         \
 605 static ssize_t                                                          \
 606 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 607                     const char *buf, size_t count)                      \
 608 {                                                                       \
 609         struct scsi_device *sdev;                                       \
 610         sdev = to_scsi_device(dev);                                     \
 611         sscanf (buf, format_string, &sdev->field);                      \
 612         return count;                                                   \
 613 }                                                                       \
 614 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 615
 616 /* Currently we don't export bit fields, but we might in future,
 617  * so leave this code in */
 618 #if 0
 619 /*
 620  * sdev_rd_attr: create a function and attribute variable for a
 621  * read/write bit field.
 622  */
 623 #define sdev_rw_attr_bit(field)                                         \
 624         sdev_show_function(field, "%d\n")                                       \
 625                                                                         \
 626 static ssize_t                                                          \
 627 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 628                     const char *buf, size_t count)                      \
 629 {                                                                       \
 630         int ret;                                                        \
 631         struct scsi_device *sdev;                                       \
 632         ret = scsi_sdev_check_buf_bit(buf);                             \
 633         if (ret >= 0)   {                                               \
 634                 sdev = to_scsi_device(dev);                             \
 635                 sdev->field = ret;                                      \
 636                 ret = count;                                            \
 637         }                                                               \
 638         return ret;                                                     \
 639 }                                                                       \
 640 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 641
 642 /*
 643  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 644  * else return -EINVAL.
 645  */
 646 static int scsi_sdev_check_buf_bit(const char *buf)
 647 {
 648         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 649                 if (buf[0] == '1')
 650                         return 1;
 651                 else if (buf[0] == '0')
 652                         return 0;
 653                 else
 654                         return -EINVAL;
 655         } else
 656                 return -EINVAL;
 657 }
 658 #endif
 659 /*
 660  * Create the actual show/store functions and data structures.
 661  */
 662 sdev_rd_attr (type, "%d\n");
 663 sdev_rd_attr (scsi_level, "%d\n");
 664 sdev_rd_attr (vendor, "%.8s\n");
 665 sdev_rd_attr (model, "%.16s\n");
 666 sdev_rd_attr (rev, "%.4s\n");
 667
 668 static ssize_t
 669 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 670                 char *buf)
 671 {
 672         struct scsi_device *sdev = to_scsi_device(dev);
 673         return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 674 }
 675 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 676
 677 static ssize_t
 678 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 679                 char *buf)
 680 {
 681         struct scsi_device *sdev = to_scsi_device(dev);
 682         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 683 }
 684 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 685
 686 /*
 687  * TODO: can we make these symlinks to the block layer ones?
 688  */
 689 static ssize_t
 690 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 691 {
 692         struct scsi_device *sdev;
 693         sdev = to_scsi_device(dev);
 694         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 695 }
 696
 697 static ssize_t
 698 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 699                     const char *buf, size_t count)
 700 {
 701         struct scsi_device *sdev;
 702         int timeout;
 703         sdev = to_scsi_device(dev);
 704         sscanf (buf, "%d\n", &timeout);
 705         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 706         return count;
 707 }
 708 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 709
 710 static ssize_t
 711 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 712 {
 713         struct scsi_device *sdev;
 714         sdev = to_scsi_device(dev);
 715         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 716 }
 717
 718 static ssize_t
 719 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 720                     const char *buf, size_t count)
 721 {
 722         struct scsi_device *sdev;
 723         unsigned int eh_timeout;
 724         int err;
 725
 726         if (!capable(CAP_SYS_ADMIN))
 727                 return -EACCES;
 728
 729         sdev = to_scsi_device(dev);
 730         err = kstrtouint(buf, 10, &eh_timeout);
 731         if (err)
 732                 return err;
 733         sdev->eh_timeout = eh_timeout * HZ;
 734
 735         return count;
 736 }
 737 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 738
 739 static ssize_t
 740 store_rescan_field (struct device *dev, struct device_attribute *attr,
 741                     const char *buf, size_t count)
 742 {
 743         scsi_rescan_device(dev);
 744         return count;
 745 }
 746 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 747
 748 static ssize_t
 749 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 750                   const char *buf, size_t count)
 751 {
 752         struct kernfs_node *kn;
 753         struct scsi_device *sdev = to_scsi_device(dev);
 754
 755         /*
 756          * We need to try to get module, avoiding the module been removed
 757          * during delete.
 758          */
 759         if (scsi_device_get(sdev))
 760                 return -ENODEV;
 761
 762         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 763         WARN_ON_ONCE(!kn);
 764         /*
 765          * Concurrent writes into the "delete" sysfs attribute may trigger
 766          * concurrent calls to device_remove_file() and scsi_remove_device().
 767          * device_remove_file() handles concurrent removal calls by
 768          * serializing these and by ignoring the second and later removal
 769          * attempts.  Concurrent calls of scsi_remove_device() are
 770          * serialized. The second and later calls of scsi_remove_device() are
 771          * ignored because the first call of that function changes the device
 772          * state into SDEV_DEL.
 773          */
 774         device_remove_file(dev, attr);
 775         scsi_remove_device(sdev);
 776         if (kn)
 777                 sysfs_unbreak_active_protection(kn);
 778         scsi_device_put(sdev);
 779         return count;
 780 };
 781 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 782
 783 static ssize_t
 784 store_state_field(struct device *dev, struct device_attribute *attr,
 785                   const char *buf, size_t count)
 786 {
 787         int i, ret;
 788         struct scsi_device *sdev = to_scsi_device(dev);
 789         enum scsi_device_state state = 0;
 790
 791         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 792                 const int len = strlen(sdev_states[i].name);
 793                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 794                    buf[len] == '\n') {
 795                         state = sdev_states[i].value;
 796                         break;
 797                 }
 798         }
 799         switch (state) {
 800         case SDEV_RUNNING:
 801         case SDEV_OFFLINE:
 802                 break;
 803         default:
 804                 return -EINVAL;
 805         }
 806
 807         mutex_lock(&sdev->state_mutex);
 808         ret = scsi_device_set_state(sdev, state);
 809         /*
 810          * If the device state changes to SDEV_RUNNING, we need to
 811          * run the queue to avoid I/O hang, and rescan the device
 812          * to revalidate it. Running the queue first is necessary
 813          * because another thread may be waiting inside
 814          * blk_mq_freeze_queue_wait() and because that call may be
 815          * waiting for pending I/O to finish.
 816          */
 817         if (ret == 0 && state == SDEV_RUNNING) {
 818                 blk_mq_run_hw_queues(sdev->request_queue, true);
 819                 scsi_rescan_device(dev);
 820         }
 821         mutex_unlock(&sdev->state_mutex);
 822
 823         return ret == 0 ? count : -EINVAL;
 824 }
 825
 826 static ssize_t
 827 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 828 {
 829         struct scsi_device *sdev = to_scsi_device(dev);
 830         const char *name = scsi_device_state_name(sdev->sdev_state);
 831
 832         if (!name)
 833                 return -EINVAL;
 834
 835         return snprintf(buf, 20, "%s\n", name);
 836 }
 837
 838 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 839
 840 static ssize_t
 841 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 842                       char *buf)
 843 {
 844         struct scsi_device *sdev = to_scsi_device(dev);
 845         const char *name = "none";
 846
 847         if (sdev->simple_tags)
 848                 name = "simple";
 849
 850         return snprintf(buf, 20, "%s\n", name);
 851 }
 852
 853 static ssize_t
 854 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 855                        const char *buf, size_t count)
 856 {
 857         struct scsi_device *sdev = to_scsi_device(dev);
 858
 859         if (!sdev->tagged_supported)
 860                 return -EINVAL;
 861
 862         sdev_printk(KERN_INFO, sdev,
 863                     "ignoring write to deprecated queue_type attribute");
 864         return count;
 865 }
 866
 867 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 868                    store_queue_type_field);
 869
 870 #define sdev_vpd_pg_attr(_page)                                         \
 871 static ssize_t                                                  \
 872 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 873                  struct bin_attribute *bin_attr,                        \
 874                  char *buf, loff_t off, size_t count)                   \
 875 {                                                                       \
 876         struct device *dev = kobj_to_dev(kobj);                         \
 877         struct scsi_device *sdev = to_scsi_device(dev);                 \
 878         struct scsi_vpd *vpd_page;                                      \
 879         int ret = -EINVAL;                                              \
 880                                                                         \
 881         rcu_read_lock();                                                \
 882         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 883         if (vpd_page)                                                   \
 884                 ret = memory_read_from_buffer(buf, count, &off,         \
 885                                 vpd_page->data, vpd_page->len);         \
 886         rcu_read_unlock();                                              \
 887         return ret;                                                     \
 888 }                                                                       \
 889 static struct bin_attribute dev_attr_vpd_##_page = {            \
 890         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 891         .size = 0,                                                      \
 892         .read = show_vpd_##_page,                                       \
 893 };
 894
 895 sdev_vpd_pg_attr(pg83);
 896 sdev_vpd_pg_attr(pg80);
 897 sdev_vpd_pg_attr(pg89);
 898 sdev_vpd_pg_attr(pg0);
 899
 900 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 901                             struct bin_attribute *bin_attr,
 902                             char *buf, loff_t off, size_t count)
 903 {
 904         struct device *dev = kobj_to_dev(kobj);
 905         struct scsi_device *sdev = to_scsi_device(dev);
 906
 907         if (!sdev->inquiry)
 908                 return -EINVAL;
 909
 910         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 911                                        sdev->inquiry_len);
 912 }
 913
 914 static struct bin_attribute dev_attr_inquiry = {
 915         .attr = {
 916                 .name = "inquiry",
 917                 .mode = S_IRUGO,
 918         },
 919         .size = 0,
 920         .read = show_inquiry,
 921 };
 922
 923 static ssize_t
 924 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 925                         char *buf)
 926 {
 927         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 928 }
 929
 930 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 931
 932 #define show_sdev_iostat(field)                                         \
 933 static ssize_t                                                          \
 934 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 935                     char *buf)                                          \
 936 {                                                                       \
 937         struct scsi_device *sdev = to_scsi_device(dev);                 \
 938         unsigned long long count = atomic_read(&sdev->field);           \
 939         return snprintf(buf, 20, "0x%llx\n", count);                    \
 940 }                                                                       \
 941 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 942
 943 show_sdev_iostat(iorequest_cnt);
 944 show_sdev_iostat(iodone_cnt);
 945 show_sdev_iostat(ioerr_cnt);
 946
 947 static ssize_t
 948 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 949 {
 950         struct scsi_device *sdev;
 951         sdev = to_scsi_device(dev);
 952         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 953 }
 954 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 955
 956 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 957 static ssize_t                                                          \
 958 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 959                      char *buf)                                         \
 960 {                                                                       \
 961         struct scsi_device *sdev = to_scsi_device(dev);                 \
 962         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 963         return snprintf(buf, 20, "%d\n", val);                          \
 964 }
 965
 966 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 967 static ssize_t                                                          \
 968 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 969                       const char *buf, size_t count)                    \
 970 {                                                                       \
 971         struct scsi_device *sdev = to_scsi_device(dev);                 \
 972         int val = simple_strtoul(buf, NULL, 0);                         \
 973         if (val == 0)                                                   \
 974                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 975         else if (val == 1)                                              \
 976                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 977         else                                                            \
 978                 return -EINVAL;                                         \
 979         return count;                                                   \
 980 }
 981
 982 #define DECLARE_EVT(name, Cap_name)                                     \
 983         DECLARE_EVT_SHOW(name, Cap_name)                                \
 984         DECLARE_EVT_STORE(name, Cap_name)                               \
 985         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 986                            sdev_store_evt_##name);
 987 #define REF_EVT(name) &dev_attr_evt_##name.attr
 988
 989 DECLARE_EVT(media_change, MEDIA_CHANGE)
 990 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 991 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 992 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 993 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 994 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 995
 996 static ssize_t
 997 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 998                        const char *buf, size_t count)
 999 {
1000         int depth, retval;
1001         struct scsi_device *sdev = to_scsi_device(dev);
1002         struct scsi_host_template *sht = sdev->host->hostt;
1003
1004         if (!sht->change_queue_depth)
1005                 return -EINVAL;
1006
1007         depth = simple_strtoul(buf, NULL, 0);
1008
1009         if (depth < 1 || depth > sdev->host->can_queue)
1010                 return -EINVAL;
1011
1012         retval = sht->change_queue_depth(sdev, depth);
1013         if (retval < 0)
1014                 return retval;
1015
1016         sdev->max_queue_depth = sdev->queue_depth;
1017
1018         return count;
1019 }
1020 sdev_show_function(queue_depth, "%d\n");
1021
1022 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1023                    sdev_store_queue_depth);
1024
1025 static ssize_t
1026 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1027                     char *buf)
1028 {
1029         struct scsi_device *sdev = to_scsi_device(dev);
1030         ssize_t count;
1031
1032         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1033         if (count > 0) {
1034                 buf[count] = '\n';
1035                 count++;
1036         }
1037         return count;
1038 }
1039 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1040
1041 #define BLIST_FLAG_NAME(name)                                   \
1042         [const_ilog2((__force __u64)BLIST_##name)] = #name
1043 static const char *const sdev_bflags_name[] = {
1044 #include "scsi_devinfo_tbl.c"
1045 };
1046 #undef BLIST_FLAG_NAME
1047
1048 static ssize_t
1049 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1050                     char *buf)
1051 {
1052         struct scsi_device *sdev = to_scsi_device(dev);
1053         int i;
1054         ssize_t len = 0;
1055
1056         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1057                 const char *name = NULL;
1058
1059                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1060                         continue;
1061                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1062                         name = sdev_bflags_name[i];
1063
1064                 if (name)
1065                         len += scnprintf(buf + len, PAGE_SIZE - len,
1066                                          "%s%s", len ? " " : "", name);
1067                 else
1068                         len += scnprintf(buf + len, PAGE_SIZE - len,
1069                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1070         }
1071         if (len)
1072                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1073         return len;
1074 }
1075 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1076
1077 #ifdef CONFIG_SCSI_DH
1078 static ssize_t
1079 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1080                    char *buf)
1081 {
1082         struct scsi_device *sdev = to_scsi_device(dev);
1083
1084         if (!sdev->handler)
1085                 return snprintf(buf, 20, "detached\n");
1086
1087         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1088 }
1089
1090 static ssize_t
1091 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1092                     const char *buf, size_t count)
1093 {
1094         struct scsi_device *sdev = to_scsi_device(dev);
1095         int err = -EINVAL;
1096
1097         if (sdev->sdev_state == SDEV_CANCEL ||
1098             sdev->sdev_state == SDEV_DEL)
1099                 return -ENODEV;
1100
1101         if (!sdev->handler) {
1102                 /*
1103                  * Attach to a device handler
1104                  */
1105                 err = scsi_dh_attach(sdev->request_queue, buf);
1106         } else if (!strncmp(buf, "activate", 8)) {
1107                 /*
1108                  * Activate a device handler
1109                  */
1110                 if (sdev->handler->activate)
1111                         err = sdev->handler->activate(sdev, NULL, NULL);
1112                 else
1113                         err = 0;
1114         } else if (!strncmp(buf, "detach", 6)) {
1115                 /*
1116                  * Detach from a device handler
1117                  */
1118                 sdev_printk(KERN_WARNING, sdev,
1119                             "can't detach handler %s.\n",
1120                             sdev->handler->name);
1121                 err = -EINVAL;
1122         }
1123
1124         return err < 0 ? err : count;
1125 }
1126
1127 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1128                    sdev_store_dh_state);
1129
1130 static ssize_t
1131 sdev_show_access_state(struct device *dev,
1132                        struct device_attribute *attr,
1133                        char *buf)
1134 {
1135         struct scsi_device *sdev = to_scsi_device(dev);
1136         unsigned char access_state;
1137         const char *access_state_name;
1138
1139         if (!sdev->handler)
1140                 return -EINVAL;
1141
1142         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1143         access_state_name = scsi_access_state_name(access_state);
1144
1145         return sprintf(buf, "%s\n",
1146                        access_state_name ? access_state_name : "unknown");
1147 }
1148 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1149
1150 static ssize_t
1151 sdev_show_preferred_path(struct device *dev,
1152                          struct device_attribute *attr,
1153                          char *buf)
1154 {
1155         struct scsi_device *sdev = to_scsi_device(dev);
1156
1157         if (!sdev->handler)
1158                 return -EINVAL;
1159
1160         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1161                 return sprintf(buf, "1\n");
1162         else
1163                 return sprintf(buf, "0\n");
1164 }
1165 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1166 #endif
1167
1168 static ssize_t
1169 sdev_show_queue_ramp_up_period(struct device *dev,
1170                                struct device_attribute *attr,
1171                                char *buf)
1172 {
1173         struct scsi_device *sdev;
1174         sdev = to_scsi_device(dev);
1175         return snprintf(buf, 20, "%u\n",
1176                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1177 }
1178
1179 static ssize_t
1180 sdev_store_queue_ramp_up_period(struct device *dev,
1181                                 struct device_attribute *attr,
1182                                 const char *buf, size_t count)
1183 {
1184         struct scsi_device *sdev = to_scsi_device(dev);
1185         unsigned int period;
1186
1187         if (kstrtouint(buf, 10, &period))
1188                 return -EINVAL;
1189
1190         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1191         return count;
1192 }
1193
1194 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1195                    sdev_show_queue_ramp_up_period,
1196                    sdev_store_queue_ramp_up_period);
1197
1198 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1199                                          struct attribute *attr, int i)
1200 {
1201         struct device *dev = kobj_to_dev(kobj);
1202         struct scsi_device *sdev = to_scsi_device(dev);
1203
1204
1205         if (attr == &dev_attr_queue_depth.attr &&
1206             !sdev->host->hostt->change_queue_depth)
1207                 return S_IRUGO;
1208
1209         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1210             !sdev->host->hostt->change_queue_depth)
1211                 return 0;
1212
1213 #ifdef CONFIG_SCSI_DH
1214         if (attr == &dev_attr_access_state.attr &&
1215             !sdev->handler)
1216                 return 0;
1217         if (attr == &dev_attr_preferred_path.attr &&
1218             !sdev->handler)
1219                 return 0;
1220 #endif
1221         return attr->mode;
1222 }
1223
1224 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1225                                              struct bin_attribute *attr, int i)
1226 {
1227         struct device *dev = kobj_to_dev(kobj);
1228         struct scsi_device *sdev = to_scsi_device(dev);
1229
1230
1231         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1232                 return 0;
1233
1234         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1235                 return 0;
1236
1237         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1238                 return 0;
1239
1240         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1241                 return 0;
1242
1243         return S_IRUGO;
1244 }
1245
1246 /* Default template for device attributes.  May NOT be modified */
1247 static struct attribute *scsi_sdev_attrs[] = {
1248         &dev_attr_device_blocked.attr,
1249         &dev_attr_type.attr,
1250         &dev_attr_scsi_level.attr,
1251         &dev_attr_device_busy.attr,
1252         &dev_attr_vendor.attr,
1253         &dev_attr_model.attr,
1254         &dev_attr_rev.attr,
1255         &dev_attr_rescan.attr,
1256         &dev_attr_delete.attr,
1257         &dev_attr_state.attr,
1258         &dev_attr_timeout.attr,
1259         &dev_attr_eh_timeout.attr,
1260         &dev_attr_iocounterbits.attr,
1261         &dev_attr_iorequest_cnt.attr,
1262         &dev_attr_iodone_cnt.attr,
1263         &dev_attr_ioerr_cnt.attr,
1264         &dev_attr_modalias.attr,
1265         &dev_attr_queue_depth.attr,
1266         &dev_attr_queue_type.attr,
1267         &dev_attr_wwid.attr,
1268         &dev_attr_blacklist.attr,
1269 #ifdef CONFIG_SCSI_DH
1270         &dev_attr_dh_state.attr,
1271         &dev_attr_access_state.attr,
1272         &dev_attr_preferred_path.attr,
1273 #endif
1274         &dev_attr_queue_ramp_up_period.attr,
1275         REF_EVT(media_change),
1276         REF_EVT(inquiry_change_reported),
1277         REF_EVT(capacity_change_reported),
1278         REF_EVT(soft_threshold_reached),
1279         REF_EVT(mode_parameter_change_reported),
1280         REF_EVT(lun_change_reported),
1281         NULL
1282 };
1283
1284 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1285         &dev_attr_vpd_pg0,
1286         &dev_attr_vpd_pg83,
1287         &dev_attr_vpd_pg80,
1288         &dev_attr_vpd_pg89,
1289         &dev_attr_inquiry,
1290         NULL
1291 };
1292 static struct attribute_group scsi_sdev_attr_group = {
1293         .attrs =        scsi_sdev_attrs,
1294         .bin_attrs =    scsi_sdev_bin_attrs,
1295         .is_visible =   scsi_sdev_attr_is_visible,
1296         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1297 };
1298
1299 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1300         &scsi_sdev_attr_group,
1301         NULL
1302 };
1303
1304 static int scsi_target_add(struct scsi_target *starget)
1305 {
1306         int error;
1307
1308         if (starget->state != STARGET_CREATED)
1309                 return 0;
1310
1311         error = device_add(&starget->dev);
1312         if (error) {
1313                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1314                 return error;
1315         }
1316         transport_add_device(&starget->dev);
1317         starget->state = STARGET_RUNNING;
1318
1319         pm_runtime_set_active(&starget->dev);
1320         pm_runtime_enable(&starget->dev);
1321         device_enable_async_suspend(&starget->dev);
1322
1323         return 0;
1324 }
1325
1326 /**
1327  * scsi_sysfs_add_sdev - add scsi device to sysfs
1328  * @sdev:       scsi_device to add
1329  *
1330  * Return value:
1331  *      0 on Success / non-zero on Failure
1332  **/
1333 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1334 {
1335         int error, i;
1336         struct request_queue *rq = sdev->request_queue;
1337         struct scsi_target *starget = sdev->sdev_target;
1338
1339         error = scsi_target_add(starget);
1340         if (error)
1341                 return error;
1342
1343         transport_configure_device(&starget->dev);
1344
1345         device_enable_async_suspend(&sdev->sdev_gendev);
1346         scsi_autopm_get_target(starget);
1347         pm_runtime_set_active(&sdev->sdev_gendev);
1348         if (!sdev->rpm_autosuspend)
1349                 pm_runtime_forbid(&sdev->sdev_gendev);
1350         pm_runtime_enable(&sdev->sdev_gendev);
1351         scsi_autopm_put_target(starget);
1352
1353         scsi_autopm_get_device(sdev);
1354
1355         scsi_dh_add_device(sdev);
1356
1357         error = device_add(&sdev->sdev_gendev);
1358         if (error) {
1359                 sdev_printk(KERN_INFO, sdev,
1360                                 "failed to add device: %d\n", error);
1361                 return error;
1362         }
1363
1364         device_enable_async_suspend(&sdev->sdev_dev);
1365         error = device_add(&sdev->sdev_dev);
1366         if (error) {
1367                 sdev_printk(KERN_INFO, sdev,
1368                                 "failed to add class device: %d\n", error);
1369                 device_del(&sdev->sdev_gendev);
1370                 return error;
1371         }
1372         transport_add_device(&sdev->sdev_gendev);
1373         sdev->is_visible = 1;
1374
1375         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1376         if (error)
1377                 /* we're treating error on bsg register as non-fatal,
1378                  * so pretend nothing went wrong */
1379                 sdev_printk(KERN_INFO, sdev,
1380                             "Failed to register bsg queue, errno=%d\n", error);
1381
1382         /* add additional host specific attributes */
1383         if (sdev->host->hostt->sdev_attrs) {
1384                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1385                         error = device_create_file(&sdev->sdev_gendev,
1386                                         sdev->host->hostt->sdev_attrs[i]);
1387                         if (error)
1388                                 return error;
1389                 }
1390         }
1391
1392         if (sdev->host->hostt->sdev_groups) {
1393                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1394                                 sdev->host->hostt->sdev_groups);
1395                 if (error)
1396                         return error;
1397         }
1398
1399         scsi_autopm_put_device(sdev);
1400         return error;
1401 }
1402
1403 void __scsi_remove_device(struct scsi_device *sdev)
1404 {
1405         struct device *dev = &sdev->sdev_gendev;
1406         int res;
1407
1408         /*
1409          * This cleanup path is not reentrant and while it is impossible
1410          * to get a new reference with scsi_device_get() someone can still
1411          * hold a previously acquired one.
1412          */
1413         if (sdev->sdev_state == SDEV_DEL)
1414                 return;
1415
1416         if (sdev->is_visible) {
1417                 /*
1418                  * If scsi_internal_target_block() is running concurrently,
1419                  * wait until it has finished before changing the device state.
1420                  */
1421                 mutex_lock(&sdev->state_mutex);
1422                 /*
1423                  * If blocked, we go straight to DEL and restart the queue so
1424                  * any commands issued during driver shutdown (like sync
1425                  * cache) are errored immediately.
1426                  */
1427                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1428                 if (res != 0) {
1429                         res = scsi_device_set_state(sdev, SDEV_DEL);
1430                         if (res == 0)
1431                                 scsi_start_queue(sdev);
1432                 }
1433                 mutex_unlock(&sdev->state_mutex);
1434
1435                 if (res != 0)
1436                         return;
1437
1438                 if (sdev->host->hostt->sdev_groups)
1439                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1440                                         sdev->host->hostt->sdev_groups);
1441
1442                 bsg_unregister_queue(sdev->request_queue);
1443                 device_unregister(&sdev->sdev_dev);
1444                 transport_remove_device(dev);
1445                 device_del(dev);
1446         } else
1447                 put_device(&sdev->sdev_dev);
1448
1449         /*
1450          * Stop accepting new requests and wait until all queuecommand() and
1451          * scsi_run_queue() invocations have finished before tearing down the
1452          * device.
1453          */
1454         mutex_lock(&sdev->state_mutex);
1455         scsi_device_set_state(sdev, SDEV_DEL);
1456         mutex_unlock(&sdev->state_mutex);
1457
1458         blk_cleanup_queue(sdev->request_queue);
1459         cancel_work_sync(&sdev->requeue_work);
1460
1461         if (sdev->host->hostt->slave_destroy)
1462                 sdev->host->hostt->slave_destroy(sdev);
1463         transport_destroy_device(dev);
1464
1465         /*
1466          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1467          * removed sysfs visibility from the device, so make the target
1468          * invisible if this was the last device underneath it.
1469          */
1470         scsi_target_reap(scsi_target(sdev));
1471
1472         put_device(dev);
1473 }
1474
1475 /**
1476  * scsi_remove_device - unregister a device from the scsi bus
1477  * @sdev:       scsi_device to unregister
1478  **/
1479 void scsi_remove_device(struct scsi_device *sdev)
1480 {
1481         struct Scsi_Host *shost = sdev->host;
1482
1483         mutex_lock(&shost->scan_mutex);
1484         __scsi_remove_device(sdev);
1485         mutex_unlock(&shost->scan_mutex);
1486 }
1487 EXPORT_SYMBOL(scsi_remove_device);
1488
1489 static void __scsi_remove_target(struct scsi_target *starget)
1490 {
1491         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1492         unsigned long flags;
1493         struct scsi_device *sdev;
1494
1495         spin_lock_irqsave(shost->host_lock, flags);
1496  restart:
1497         list_for_each_entry(sdev, &shost->__devices, siblings) {
1498                 /*
1499                  * We cannot call scsi_device_get() here, as
1500                  * we might've been called from rmmod() causing
1501                  * scsi_device_get() to fail the module_is_live()
1502                  * check.
1503                  */
1504                 if (sdev->channel != starget->channel ||
1505                     sdev->id != starget->id)
1506                         continue;
1507                 if (sdev->sdev_state == SDEV_DEL ||
1508                     sdev->sdev_state == SDEV_CANCEL ||
1509                     !get_device(&sdev->sdev_gendev))
1510                         continue;
1511                 spin_unlock_irqrestore(shost->host_lock, flags);
1512                 scsi_remove_device(sdev);
1513                 put_device(&sdev->sdev_gendev);
1514                 spin_lock_irqsave(shost->host_lock, flags);
1515                 goto restart;
1516         }
1517         spin_unlock_irqrestore(shost->host_lock, flags);
1518 }
1519
1520 /**
1521  * scsi_remove_target - try to remove a target and all its devices
1522  * @dev: generic starget or parent of generic stargets to be removed
1523  *
1524  * Note: This is slightly racy.  It is possible that if the user
1525  * requests the addition of another device then the target won't be
1526  * removed.
1527  */
1528 void scsi_remove_target(struct device *dev)
1529 {
1530         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1531         struct scsi_target *starget;
1532         unsigned long flags;
1533
1534 restart:
1535         spin_lock_irqsave(shost->host_lock, flags);
1536         list_for_each_entry(starget, &shost->__targets, siblings) {
1537                 if (starget->state == STARGET_DEL ||
1538                     starget->state == STARGET_REMOVE ||
1539                     starget->state == STARGET_CREATED_REMOVE)
1540                         continue;
1541                 if (starget->dev.parent == dev || &starget->dev == dev) {
1542                         kref_get(&starget->reap_ref);
1543                         if (starget->state == STARGET_CREATED)
1544                                 starget->state = STARGET_CREATED_REMOVE;
1545                         else
1546                                 starget->state = STARGET_REMOVE;
1547                         spin_unlock_irqrestore(shost->host_lock, flags);
1548                         __scsi_remove_target(starget);
1549                         scsi_target_reap(starget);
1550                         goto restart;
1551                 }
1552         }
1553         spin_unlock_irqrestore(shost->host_lock, flags);
1554 }
1555 EXPORT_SYMBOL(scsi_remove_target);
1556
1557 int scsi_register_driver(struct device_driver *drv)
1558 {
1559         drv->bus = &scsi_bus_type;
1560
1561         return driver_register(drv);
1562 }
1563 EXPORT_SYMBOL(scsi_register_driver);
1564
1565 int scsi_register_interface(struct class_interface *intf)
1566 {
1567         intf->class = &sdev_class;
1568
1569         return class_interface_register(intf);
1570 }
1571 EXPORT_SYMBOL(scsi_register_interface);
1572
1573 /**
1574  * scsi_sysfs_add_host - add scsi host to subsystem
1575  * @shost:     scsi host struct to add to subsystem
1576  **/
1577 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1578 {
1579         int error, i;
1580
1581         /* add host specific attributes */
1582         if (shost->hostt->shost_attrs) {
1583                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1584                         error = device_create_file(&shost->shost_dev,
1585                                         shost->hostt->shost_attrs[i]);
1586                         if (error)
1587                                 return error;
1588                 }
1589         }
1590
1591         transport_register_device(&shost->shost_gendev);
1592         transport_configure_device(&shost->shost_gendev);
1593         return 0;
1594 }
1595
1596 static struct device_type scsi_dev_type = {
1597         .name =         "scsi_device",
1598         .release =      scsi_device_dev_release,
1599         .groups =       scsi_sdev_attr_groups,
1600 };
1601
1602 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1603 {
1604         unsigned long flags;
1605         struct Scsi_Host *shost = sdev->host;
1606         struct scsi_target  *starget = sdev->sdev_target;
1607
1608         device_initialize(&sdev->sdev_gendev);
1609         sdev->sdev_gendev.bus = &scsi_bus_type;
1610         sdev->sdev_gendev.type = &scsi_dev_type;
1611         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1612                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1613
1614         device_initialize(&sdev->sdev_dev);
1615         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1616         sdev->sdev_dev.class = &sdev_class;
1617         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1618                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1619         /*
1620          * Get a default scsi_level from the target (derived from sibling
1621          * devices).  This is the best we can do for guessing how to set
1622          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1623          * setting doesn't matter, because all the bits are zero anyway.
1624          * But it does matter for higher LUNs.
1625          */
1626         sdev->scsi_level = starget->scsi_level;
1627         if (sdev->scsi_level <= SCSI_2 &&
1628                         sdev->scsi_level != SCSI_UNKNOWN &&
1629                         !shost->no_scsi2_lun_in_cdb)
1630                 sdev->lun_in_cdb = 1;
1631
1632         transport_setup_device(&sdev->sdev_gendev);
1633         spin_lock_irqsave(shost->host_lock, flags);
1634         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1635         list_add_tail(&sdev->siblings, &shost->__devices);
1636         spin_unlock_irqrestore(shost->host_lock, flags);
1637         /*
1638          * device can now only be removed via __scsi_remove_device() so hold
1639          * the target.  Target will be held in CREATED state until something
1640          * beneath it becomes visible (in which case it moves to RUNNING)
1641          */
1642         kref_get(&starget->reap_ref);
1643 }
1644
1645 int scsi_is_sdev_device(const struct device *dev)
1646 {
1647         return dev->type == &scsi_dev_type;
1648 }
1649 EXPORT_SYMBOL(scsi_is_sdev_device);
1650
1651 /* A blank transport template that is used in drivers that don't
1652  * yet implement Transport Attributes */
1653 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };