drivers/scsi/scsi_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * scsi_sysfs.c
   4  *
   5  * SCSI sysfs interface routines.
   6  *
   7  * Created to pull SCSI mid layer sysfs routines into one file.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/init.h>
  13 #include <linux/blkdev.h>
  14 #include <linux/device.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/bsg.h>
  17
  18 #include <scsi/scsi.h>
  19 #include <scsi/scsi_device.h>
  20 #include <scsi/scsi_host.h>
  21 #include <scsi/scsi_tcq.h>
  22 #include <scsi/scsi_dh.h>
  23 #include <scsi/scsi_transport.h>
  24 #include <scsi/scsi_driver.h>
  25 #include <scsi/scsi_devinfo.h>
  26
  27 #include "scsi_priv.h"
  28 #include "scsi_logging.h"
  29
  30 static struct device_type scsi_dev_type;
  31
  32 static const struct {
  33         enum scsi_device_state  value;
  34         char                    *name;
  35 } sdev_states[] = {
  36         { SDEV_CREATED, "created" },
  37         { SDEV_RUNNING, "running" },
  38         { SDEV_CANCEL, "cancel" },
  39         { SDEV_DEL, "deleted" },
  40         { SDEV_QUIESCE, "quiesce" },
  41         { SDEV_OFFLINE, "offline" },
  42         { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  43         { SDEV_BLOCK,   "blocked" },
  44         { SDEV_CREATED_BLOCK, "created-blocked" },
  45 };
  46
  47 const char *scsi_device_state_name(enum scsi_device_state state)
  48 {
  49         int i;
  50         char *name = NULL;
  51
  52         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  53                 if (sdev_states[i].value == state) {
  54                         name = sdev_states[i].name;
  55                         break;
  56                 }
  57         }
  58         return name;
  59 }
  60
  61 static const struct {
  62         enum scsi_host_state    value;
  63         char                    *name;
  64 } shost_states[] = {
  65         { SHOST_CREATED, "created" },
  66         { SHOST_RUNNING, "running" },
  67         { SHOST_CANCEL, "cancel" },
  68         { SHOST_DEL, "deleted" },
  69         { SHOST_RECOVERY, "recovery" },
  70         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  71         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  72 };
  73 const char *scsi_host_state_name(enum scsi_host_state state)
  74 {
  75         int i;
  76         char *name = NULL;
  77
  78         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  79                 if (shost_states[i].value == state) {
  80                         name = shost_states[i].name;
  81                         break;
  82                 }
  83         }
  84         return name;
  85 }
  86
  87 #ifdef CONFIG_SCSI_DH
  88 static const struct {
  89         unsigned char   value;
  90         char            *name;
  91 } sdev_access_states[] = {
  92         { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
  93         { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
  94         { SCSI_ACCESS_STATE_STANDBY, "standby" },
  95         { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
  96         { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
  97         { SCSI_ACCESS_STATE_OFFLINE, "offline" },
  98         { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
  99 };
 100
 101 static const char *scsi_access_state_name(unsigned char state)
 102 {
 103         int i;
 104         char *name = NULL;
 105
 106         for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
 107                 if (sdev_access_states[i].value == state) {
 108                         name = sdev_access_states[i].name;
 109                         break;
 110                 }
 111         }
 112         return name;
 113 }
 114 #endif
 115
 116 static int check_set(unsigned long long *val, char *src)
 117 {
 118         char *last;
 119
 120         if (strcmp(src, "-") == 0) {
 121                 *val = SCAN_WILD_CARD;
 122         } else {
 123                 /*
 124                  * Doesn't check for int overflow
 125                  */
 126                 *val = simple_strtoull(src, &last, 0);
 127                 if (*last != '\0')
 128                         return 1;
 129         }
 130         return 0;
 131 }
 132
 133 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 134 {
 135         char s1[15], s2[15], s3[17], junk;
 136         unsigned long long channel, id, lun;
 137         int res;
 138
 139         res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
 140         if (res != 3)
 141                 return -EINVAL;
 142         if (check_set(&channel, s1))
 143                 return -EINVAL;
 144         if (check_set(&id, s2))
 145                 return -EINVAL;
 146         if (check_set(&lun, s3))
 147                 return -EINVAL;
 148         if (shost->transportt->user_scan)
 149                 res = shost->transportt->user_scan(shost, channel, id, lun);
 150         else
 151                 res = scsi_scan_host_selected(shost, channel, id, lun,
 152                                               SCSI_SCAN_MANUAL);
 153         return res;
 154 }
 155
 156 /*
 157  * shost_show_function: macro to create an attr function that can be used to
 158  * show a non-bit field.
 159  */
 160 #define shost_show_function(name, field, format_string)                 \
 161 static ssize_t                                                          \
 162 show_##name (struct device *dev, struct device_attribute *attr,         \
 163              char *buf)                                                 \
 164 {                                                                       \
 165         struct Scsi_Host *shost = class_to_shost(dev);                  \
 166         return snprintf (buf, 20, format_string, shost->field);         \
 167 }
 168
 169 /*
 170  * shost_rd_attr: macro to create a function and attribute variable for a
 171  * read only field.
 172  */
 173 #define shost_rd_attr2(name, field, format_string)                      \
 174         shost_show_function(name, field, format_string)                 \
 175 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 176
 177 #define shost_rd_attr(field, format_string) \
 178 shost_rd_attr2(field, field, format_string)
 179
 180 /*
 181  * Create the actual show/store functions and data structures.
 182  */
 183
 184 static ssize_t
 185 store_scan(struct device *dev, struct device_attribute *attr,
 186            const char *buf, size_t count)
 187 {
 188         struct Scsi_Host *shost = class_to_shost(dev);
 189         int res;
 190
 191         res = scsi_scan(shost, buf);
 192         if (res == 0)
 193                 res = count;
 194         return res;
 195 };
 196 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 197
 198 static ssize_t
 199 store_shost_state(struct device *dev, struct device_attribute *attr,
 200                   const char *buf, size_t count)
 201 {
 202         int i;
 203         struct Scsi_Host *shost = class_to_shost(dev);
 204         enum scsi_host_state state = 0;
 205
 206         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 207                 const int len = strlen(shost_states[i].name);
 208                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 209                    buf[len] == '\n') {
 210                         state = shost_states[i].value;
 211                         break;
 212                 }
 213         }
 214         if (!state)
 215                 return -EINVAL;
 216
 217         if (scsi_host_set_state(shost, state))
 218                 return -EINVAL;
 219         return count;
 220 }
 221
 222 static ssize_t
 223 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 224 {
 225         struct Scsi_Host *shost = class_to_shost(dev);
 226         const char *name = scsi_host_state_name(shost->shost_state);
 227
 228         if (!name)
 229                 return -EINVAL;
 230
 231         return snprintf(buf, 20, "%s\n", name);
 232 }
 233
 234 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 235 static struct device_attribute dev_attr_hstate =
 236         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 237
 238 static ssize_t
 239 show_shost_mode(unsigned int mode, char *buf)
 240 {
 241         ssize_t len = 0;
 242
 243         if (mode & MODE_INITIATOR)
 244                 len = sprintf(buf, "%s", "Initiator");
 245
 246         if (mode & MODE_TARGET)
 247                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 248
 249         len += sprintf(buf + len, "\n");
 250
 251         return len;
 252 }
 253
 254 static ssize_t
 255 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 256                           char *buf)
 257 {
 258         struct Scsi_Host *shost = class_to_shost(dev);
 259         unsigned int supported_mode = shost->hostt->supported_mode;
 260
 261         if (supported_mode == MODE_UNKNOWN)
 262                 /* by default this should be initiator */
 263                 supported_mode = MODE_INITIATOR;
 264
 265         return show_shost_mode(supported_mode, buf);
 266 }
 267
 268 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 269
 270 static ssize_t
 271 show_shost_active_mode(struct device *dev,
 272                        struct device_attribute *attr, char *buf)
 273 {
 274         struct Scsi_Host *shost = class_to_shost(dev);
 275
 276         if (shost->active_mode == MODE_UNKNOWN)
 277                 return snprintf(buf, 20, "unknown\n");
 278         else
 279                 return show_shost_mode(shost->active_mode, buf);
 280 }
 281
 282 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 283
 284 static int check_reset_type(const char *str)
 285 {
 286         if (sysfs_streq(str, "adapter"))
 287                 return SCSI_ADAPTER_RESET;
 288         else if (sysfs_streq(str, "firmware"))
 289                 return SCSI_FIRMWARE_RESET;
 290         else
 291                 return 0;
 292 }
 293
 294 static ssize_t
 295 store_host_reset(struct device *dev, struct device_attribute *attr,
 296                 const char *buf, size_t count)
 297 {
 298         struct Scsi_Host *shost = class_to_shost(dev);
 299         struct scsi_host_template *sht = shost->hostt;
 300         int ret = -EINVAL;
 301         int type;
 302
 303         type = check_reset_type(buf);
 304         if (!type)
 305                 goto exit_store_host_reset;
 306
 307         if (sht->host_reset)
 308                 ret = sht->host_reset(shost, type);
 309         else
 310                 ret = -EOPNOTSUPP;
 311
 312 exit_store_host_reset:
 313         if (ret == 0)
 314                 ret = count;
 315         return ret;
 316 }
 317
 318 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 319
 320 static ssize_t
 321 show_shost_eh_deadline(struct device *dev,
 322                       struct device_attribute *attr, char *buf)
 323 {
 324         struct Scsi_Host *shost = class_to_shost(dev);
 325
 326         if (shost->eh_deadline == -1)
 327                 return snprintf(buf, strlen("off") + 2, "off\n");
 328         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 329 }
 330
 331 static ssize_t
 332 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 333                 const char *buf, size_t count)
 334 {
 335         struct Scsi_Host *shost = class_to_shost(dev);
 336         int ret = -EINVAL;
 337         unsigned long deadline, flags;
 338
 339         if (shost->transportt &&
 340             (shost->transportt->eh_strategy_handler ||
 341              !shost->hostt->eh_host_reset_handler))
 342                 return ret;
 343
 344         if (!strncmp(buf, "off", strlen("off")))
 345                 deadline = -1;
 346         else {
 347                 ret = kstrtoul(buf, 10, &deadline);
 348                 if (ret)
 349                         return ret;
 350                 if (deadline * HZ > UINT_MAX)
 351                         return -EINVAL;
 352         }
 353
 354         spin_lock_irqsave(shost->host_lock, flags);
 355         if (scsi_host_in_recovery(shost))
 356                 ret = -EBUSY;
 357         else {
 358                 if (deadline == -1)
 359                         shost->eh_deadline = -1;
 360                 else
 361                         shost->eh_deadline = deadline * HZ;
 362
 363                 ret = count;
 364         }
 365         spin_unlock_irqrestore(shost->host_lock, flags);
 366
 367         return ret;
 368 }
 369
 370 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 371
 372 shost_rd_attr(unique_id, "%u\n");
 373 shost_rd_attr(cmd_per_lun, "%hd\n");
 374 shost_rd_attr(can_queue, "%d\n");
 375 shost_rd_attr(sg_tablesize, "%hu\n");
 376 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 377 shost_rd_attr(prot_capabilities, "%u\n");
 378 shost_rd_attr(prot_guard_type, "%hd\n");
 379 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 380
 381 static ssize_t
 382 show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
 383 {
 384         struct Scsi_Host *shost = class_to_shost(dev);
 385         return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
 386 }
 387 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 388
 389 static ssize_t
 390 show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
 391 {
 392         return sprintf(buf, "1\n");
 393 }
 394 static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
 395
 396 static ssize_t
 397 show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf)
 398 {
 399         struct Scsi_Host *shost = class_to_shost(dev);
 400         struct blk_mq_tag_set *tag_set = &shost->tag_set;
 401
 402         return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues);
 403 }
 404 static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
 405
 406 static struct attribute *scsi_sysfs_shost_attrs[] = {
 407         &dev_attr_use_blk_mq.attr,
 408         &dev_attr_unique_id.attr,
 409         &dev_attr_host_busy.attr,
 410         &dev_attr_cmd_per_lun.attr,
 411         &dev_attr_can_queue.attr,
 412         &dev_attr_sg_tablesize.attr,
 413         &dev_attr_sg_prot_tablesize.attr,
 414         &dev_attr_proc_name.attr,
 415         &dev_attr_scan.attr,
 416         &dev_attr_hstate.attr,
 417         &dev_attr_supported_mode.attr,
 418         &dev_attr_active_mode.attr,
 419         &dev_attr_prot_capabilities.attr,
 420         &dev_attr_prot_guard_type.attr,
 421         &dev_attr_host_reset.attr,
 422         &dev_attr_eh_deadline.attr,
 423         &dev_attr_nr_hw_queues.attr,
 424         NULL
 425 };
 426
 427 static const struct attribute_group scsi_shost_attr_group = {
 428         .attrs =        scsi_sysfs_shost_attrs,
 429 };
 430
 431 const struct attribute_group *scsi_shost_groups[] = {
 432         &scsi_shost_attr_group,
 433         NULL
 434 };
 435
 436 static void scsi_device_cls_release(struct device *class_dev)
 437 {
 438         struct scsi_device *sdev;
 439
 440         sdev = class_to_sdev(class_dev);
 441         put_device(&sdev->sdev_gendev);
 442 }
 443
 444 static void scsi_device_dev_release(struct device *dev)
 445 {
 446         struct scsi_device *sdev = to_scsi_device(dev);
 447         struct device *parent;
 448         struct list_head *this, *tmp;
 449         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 450         struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
 451         struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL;
 452         unsigned long flags;
 453
 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         vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
 490                                        lockdep_is_held(&sdev->inquiry_mutex));
 491         vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
 492                                        lockdep_is_held(&sdev->inquiry_mutex));
 493         vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
 494                                        lockdep_is_held(&sdev->inquiry_mutex));
 495         mutex_unlock(&sdev->inquiry_mutex);
 496
 497         if (vpd_pg0)
 498                 kfree_rcu(vpd_pg0, rcu);
 499         if (vpd_pg83)
 500                 kfree_rcu(vpd_pg83, rcu);
 501         if (vpd_pg80)
 502                 kfree_rcu(vpd_pg80, rcu);
 503         if (vpd_pg89)
 504                 kfree_rcu(vpd_pg89, rcu);
 505         if (vpd_pgb0)
 506                 kfree_rcu(vpd_pgb0, rcu);
 507         if (vpd_pgb1)
 508                 kfree_rcu(vpd_pgb1, rcu);
 509         if (vpd_pgb2)
 510                 kfree_rcu(vpd_pgb2, rcu);
 511         kfree(sdev->inquiry);
 512         kfree(sdev);
 513
 514         if (parent)
 515                 put_device(parent);
 516 }
 517
 518 static struct class sdev_class = {
 519         .name           = "scsi_device",
 520         .dev_release    = scsi_device_cls_release,
 521 };
 522
 523 /* all probing is done in the individual ->probe routines */
 524 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 525 {
 526         struct scsi_device *sdp;
 527
 528         if (dev->type != &scsi_dev_type)
 529                 return 0;
 530
 531         sdp = to_scsi_device(dev);
 532         if (sdp->no_uld_attach)
 533                 return 0;
 534         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 535 }
 536
 537 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 538 {
 539         struct scsi_device *sdev;
 540
 541         if (dev->type != &scsi_dev_type)
 542                 return 0;
 543
 544         sdev = to_scsi_device(dev);
 545
 546         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 547         return 0;
 548 }
 549
 550 struct bus_type scsi_bus_type = {
 551         .name           = "scsi",
 552         .match          = scsi_bus_match,
 553         .uevent         = scsi_bus_uevent,
 554 #ifdef CONFIG_PM
 555         .pm             = &scsi_bus_pm_ops,
 556 #endif
 557 };
 558
 559 int scsi_sysfs_register(void)
 560 {
 561         int error;
 562
 563         error = bus_register(&scsi_bus_type);
 564         if (!error) {
 565                 error = class_register(&sdev_class);
 566                 if (error)
 567                         bus_unregister(&scsi_bus_type);
 568         }
 569
 570         return error;
 571 }
 572
 573 void scsi_sysfs_unregister(void)
 574 {
 575         class_unregister(&sdev_class);
 576         bus_unregister(&scsi_bus_type);
 577 }
 578
 579 /*
 580  * sdev_show_function: macro to create an attr function that can be used to
 581  * show a non-bit field.
 582  */
 583 #define sdev_show_function(field, format_string)                                \
 584 static ssize_t                                                          \
 585 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 586                    char *buf)                                           \
 587 {                                                                       \
 588         struct scsi_device *sdev;                                       \
 589         sdev = to_scsi_device(dev);                                     \
 590         return snprintf (buf, 20, format_string, sdev->field);          \
 591 }                                                                       \
 592
 593 /*
 594  * sdev_rd_attr: macro to create a function and attribute variable for a
 595  * read only field.
 596  */
 597 #define sdev_rd_attr(field, format_string)                              \
 598         sdev_show_function(field, format_string)                        \
 599 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 600
 601
 602 /*
 603  * sdev_rw_attr: create a function and attribute variable for a
 604  * read/write field.
 605  */
 606 #define sdev_rw_attr(field, format_string)                              \
 607         sdev_show_function(field, format_string)                                \
 608                                                                         \
 609 static ssize_t                                                          \
 610 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 611                     const char *buf, size_t count)                      \
 612 {                                                                       \
 613         struct scsi_device *sdev;                                       \
 614         sdev = to_scsi_device(dev);                                     \
 615         sscanf (buf, format_string, &sdev->field);                      \
 616         return count;                                                   \
 617 }                                                                       \
 618 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 619
 620 /* Currently we don't export bit fields, but we might in future,
 621  * so leave this code in */
 622 #if 0
 623 /*
 624  * sdev_rd_attr: create a function and attribute variable for a
 625  * read/write bit field.
 626  */
 627 #define sdev_rw_attr_bit(field)                                         \
 628         sdev_show_function(field, "%d\n")                                       \
 629                                                                         \
 630 static ssize_t                                                          \
 631 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 632                     const char *buf, size_t count)                      \
 633 {                                                                       \
 634         int ret;                                                        \
 635         struct scsi_device *sdev;                                       \
 636         ret = scsi_sdev_check_buf_bit(buf);                             \
 637         if (ret >= 0)   {                                               \
 638                 sdev = to_scsi_device(dev);                             \
 639                 sdev->field = ret;                                      \
 640                 ret = count;                                            \
 641         }                                                               \
 642         return ret;                                                     \
 643 }                                                                       \
 644 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 645
 646 /*
 647  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 648  * else return -EINVAL.
 649  */
 650 static int scsi_sdev_check_buf_bit(const char *buf)
 651 {
 652         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 653                 if (buf[0] == '1')
 654                         return 1;
 655                 else if (buf[0] == '0')
 656                         return 0;
 657                 else
 658                         return -EINVAL;
 659         } else
 660                 return -EINVAL;
 661 }
 662 #endif
 663 /*
 664  * Create the actual show/store functions and data structures.
 665  */
 666 sdev_rd_attr (type, "%d\n");
 667 sdev_rd_attr (scsi_level, "%d\n");
 668 sdev_rd_attr (vendor, "%.8s\n");
 669 sdev_rd_attr (model, "%.16s\n");
 670 sdev_rd_attr (rev, "%.4s\n");
 671
 672 static ssize_t
 673 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 674                 char *buf)
 675 {
 676         struct scsi_device *sdev = to_scsi_device(dev);
 677         return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 678 }
 679 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 680
 681 static ssize_t
 682 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 683                 char *buf)
 684 {
 685         struct scsi_device *sdev = to_scsi_device(dev);
 686         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 687 }
 688 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 689
 690 /*
 691  * TODO: can we make these symlinks to the block layer ones?
 692  */
 693 static ssize_t
 694 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 695 {
 696         struct scsi_device *sdev;
 697         sdev = to_scsi_device(dev);
 698         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 699 }
 700
 701 static ssize_t
 702 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 703                     const char *buf, size_t count)
 704 {
 705         struct scsi_device *sdev;
 706         int timeout;
 707         sdev = to_scsi_device(dev);
 708         sscanf (buf, "%d\n", &timeout);
 709         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 710         return count;
 711 }
 712 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 713
 714 static ssize_t
 715 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 716 {
 717         struct scsi_device *sdev;
 718         sdev = to_scsi_device(dev);
 719         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 720 }
 721
 722 static ssize_t
 723 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 724                     const char *buf, size_t count)
 725 {
 726         struct scsi_device *sdev;
 727         unsigned int eh_timeout;
 728         int err;
 729
 730         if (!capable(CAP_SYS_ADMIN))
 731                 return -EACCES;
 732
 733         sdev = to_scsi_device(dev);
 734         err = kstrtouint(buf, 10, &eh_timeout);
 735         if (err)
 736                 return err;
 737         sdev->eh_timeout = eh_timeout * HZ;
 738
 739         return count;
 740 }
 741 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 742
 743 static ssize_t
 744 store_rescan_field (struct device *dev, struct device_attribute *attr,
 745                     const char *buf, size_t count)
 746 {
 747         scsi_rescan_device(dev);
 748         return count;
 749 }
 750 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 751
 752 static ssize_t
 753 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 754                   const char *buf, size_t count)
 755 {
 756         struct kernfs_node *kn;
 757         struct scsi_device *sdev = to_scsi_device(dev);
 758
 759         /*
 760          * We need to try to get module, avoiding the module been removed
 761          * during delete.
 762          */
 763         if (scsi_device_get(sdev))
 764                 return -ENODEV;
 765
 766         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 767         WARN_ON_ONCE(!kn);
 768         /*
 769          * Concurrent writes into the "delete" sysfs attribute may trigger
 770          * concurrent calls to device_remove_file() and scsi_remove_device().
 771          * device_remove_file() handles concurrent removal calls by
 772          * serializing these and by ignoring the second and later removal
 773          * attempts.  Concurrent calls of scsi_remove_device() are
 774          * serialized. The second and later calls of scsi_remove_device() are
 775          * ignored because the first call of that function changes the device
 776          * state into SDEV_DEL.
 777          */
 778         device_remove_file(dev, attr);
 779         scsi_remove_device(sdev);
 780         if (kn)
 781                 sysfs_unbreak_active_protection(kn);
 782         scsi_device_put(sdev);
 783         return count;
 784 };
 785 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 786
 787 static ssize_t
 788 store_state_field(struct device *dev, struct device_attribute *attr,
 789                   const char *buf, size_t count)
 790 {
 791         int i, ret;
 792         struct scsi_device *sdev = to_scsi_device(dev);
 793         enum scsi_device_state state = 0;
 794         bool rescan_dev = false;
 795
 796         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 797                 const int len = strlen(sdev_states[i].name);
 798                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 799                    buf[len] == '\n') {
 800                         state = sdev_states[i].value;
 801                         break;
 802                 }
 803         }
 804         switch (state) {
 805         case SDEV_RUNNING:
 806         case SDEV_OFFLINE:
 807                 break;
 808         default:
 809                 return -EINVAL;
 810         }
 811
 812         mutex_lock(&sdev->state_mutex);
 813         switch (sdev->sdev_state) {
 814         case SDEV_RUNNING:
 815         case SDEV_OFFLINE:
 816                 break;
 817         default:
 818                 mutex_unlock(&sdev->state_mutex);
 819                 return -EINVAL;
 820         }
 821         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
 822                 ret = 0;
 823         } else {
 824                 ret = scsi_device_set_state(sdev, state);
 825                 if (ret == 0 && state == SDEV_RUNNING)
 826                         rescan_dev = true;
 827         }
 828         mutex_unlock(&sdev->state_mutex);
 829
 830         if (rescan_dev) {
 831                 /*
 832                  * If the device state changes to SDEV_RUNNING, we need to
 833                  * run the queue to avoid I/O hang, and rescan the device
 834                  * to revalidate it. Running the queue first is necessary
 835                  * because another thread may be waiting inside
 836                  * blk_mq_freeze_queue_wait() and because that call may be
 837                  * waiting for pending I/O to finish.
 838                  */
 839                 blk_mq_run_hw_queues(sdev->request_queue, true);
 840                 scsi_rescan_device(dev);
 841         }
 842
 843         return ret == 0 ? count : -EINVAL;
 844 }
 845
 846 static ssize_t
 847 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 848 {
 849         struct scsi_device *sdev = to_scsi_device(dev);
 850         const char *name = scsi_device_state_name(sdev->sdev_state);
 851
 852         if (!name)
 853                 return -EINVAL;
 854
 855         return snprintf(buf, 20, "%s\n", name);
 856 }
 857
 858 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 859
 860 static ssize_t
 861 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 862                       char *buf)
 863 {
 864         struct scsi_device *sdev = to_scsi_device(dev);
 865         const char *name = "none";
 866
 867         if (sdev->simple_tags)
 868                 name = "simple";
 869
 870         return snprintf(buf, 20, "%s\n", name);
 871 }
 872
 873 static ssize_t
 874 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 875                        const char *buf, size_t count)
 876 {
 877         struct scsi_device *sdev = to_scsi_device(dev);
 878
 879         if (!sdev->tagged_supported)
 880                 return -EINVAL;
 881
 882         sdev_printk(KERN_INFO, sdev,
 883                     "ignoring write to deprecated queue_type attribute");
 884         return count;
 885 }
 886
 887 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 888                    store_queue_type_field);
 889
 890 #define sdev_vpd_pg_attr(_page)                                         \
 891 static ssize_t                                                  \
 892 show_vpd_##_page(struct file *filp, 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         struct scsi_vpd *vpd_page;                                      \
 899         int ret = -EINVAL;                                              \
 900                                                                         \
 901         rcu_read_lock();                                                \
 902         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 903         if (vpd_page)                                                   \
 904                 ret = memory_read_from_buffer(buf, count, &off,         \
 905                                 vpd_page->data, vpd_page->len);         \
 906         rcu_read_unlock();                                              \
 907         return ret;                                                     \
 908 }                                                                       \
 909 static struct bin_attribute dev_attr_vpd_##_page = {            \
 910         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 911         .size = 0,                                                      \
 912         .read = show_vpd_##_page,                                       \
 913 };
 914
 915 sdev_vpd_pg_attr(pg83);
 916 sdev_vpd_pg_attr(pg80);
 917 sdev_vpd_pg_attr(pg89);
 918 sdev_vpd_pg_attr(pgb0);
 919 sdev_vpd_pg_attr(pgb1);
 920 sdev_vpd_pg_attr(pgb2);
 921 sdev_vpd_pg_attr(pg0);
 922
 923 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 924                             struct bin_attribute *bin_attr,
 925                             char *buf, loff_t off, size_t count)
 926 {
 927         struct device *dev = kobj_to_dev(kobj);
 928         struct scsi_device *sdev = to_scsi_device(dev);
 929
 930         if (!sdev->inquiry)
 931                 return -EINVAL;
 932
 933         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 934                                        sdev->inquiry_len);
 935 }
 936
 937 static struct bin_attribute dev_attr_inquiry = {
 938         .attr = {
 939                 .name = "inquiry",
 940                 .mode = S_IRUGO,
 941         },
 942         .size = 0,
 943         .read = show_inquiry,
 944 };
 945
 946 static ssize_t
 947 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 948                         char *buf)
 949 {
 950         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 951 }
 952
 953 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 954
 955 #define show_sdev_iostat(field)                                         \
 956 static ssize_t                                                          \
 957 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 958                     char *buf)                                          \
 959 {                                                                       \
 960         struct scsi_device *sdev = to_scsi_device(dev);                 \
 961         unsigned long long count = atomic_read(&sdev->field);           \
 962         return snprintf(buf, 20, "0x%llx\n", count);                    \
 963 }                                                                       \
 964 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 965
 966 show_sdev_iostat(iorequest_cnt);
 967 show_sdev_iostat(iodone_cnt);
 968 show_sdev_iostat(ioerr_cnt);
 969 show_sdev_iostat(iotmo_cnt);
 970
 971 static ssize_t
 972 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 973 {
 974         struct scsi_device *sdev;
 975         sdev = to_scsi_device(dev);
 976         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 977 }
 978 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 979
 980 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 981 static ssize_t                                                          \
 982 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 983                      char *buf)                                         \
 984 {                                                                       \
 985         struct scsi_device *sdev = to_scsi_device(dev);                 \
 986         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 987         return snprintf(buf, 20, "%d\n", val);                          \
 988 }
 989
 990 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 991 static ssize_t                                                          \
 992 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 993                       const char *buf, size_t count)                    \
 994 {                                                                       \
 995         struct scsi_device *sdev = to_scsi_device(dev);                 \
 996         int val = simple_strtoul(buf, NULL, 0);                         \
 997         if (val == 0)                                                   \
 998                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 999         else if (val == 1)                                              \
1000                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
1001         else                                                            \
1002                 return -EINVAL;                                         \
1003         return count;                                                   \
1004 }
1005
1006 #define DECLARE_EVT(name, Cap_name)                                     \
1007         DECLARE_EVT_SHOW(name, Cap_name)                                \
1008         DECLARE_EVT_STORE(name, Cap_name)                               \
1009         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
1010                            sdev_store_evt_##name);
1011 #define REF_EVT(name) &dev_attr_evt_##name.attr
1012
1013 DECLARE_EVT(media_change, MEDIA_CHANGE)
1014 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1015 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1016 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1017 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1018 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1019
1020 static ssize_t
1021 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1022                        const char *buf, size_t count)
1023 {
1024         int depth, retval;
1025         struct scsi_device *sdev = to_scsi_device(dev);
1026         struct scsi_host_template *sht = sdev->host->hostt;
1027
1028         if (!sht->change_queue_depth)
1029                 return -EINVAL;
1030
1031         depth = simple_strtoul(buf, NULL, 0);
1032
1033         if (depth < 1 || depth > sdev->host->can_queue)
1034                 return -EINVAL;
1035
1036         retval = sht->change_queue_depth(sdev, depth);
1037         if (retval < 0)
1038                 return retval;
1039
1040         sdev->max_queue_depth = sdev->queue_depth;
1041
1042         return count;
1043 }
1044 sdev_show_function(queue_depth, "%d\n");
1045
1046 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1047                    sdev_store_queue_depth);
1048
1049 static ssize_t
1050 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1051                     char *buf)
1052 {
1053         struct scsi_device *sdev = to_scsi_device(dev);
1054         ssize_t count;
1055
1056         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1057         if (count > 0) {
1058                 buf[count] = '\n';
1059                 count++;
1060         }
1061         return count;
1062 }
1063 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1064
1065 #define BLIST_FLAG_NAME(name)                                   \
1066         [const_ilog2((__force __u64)BLIST_##name)] = #name
1067 static const char *const sdev_bflags_name[] = {
1068 #include "scsi_devinfo_tbl.c"
1069 };
1070 #undef BLIST_FLAG_NAME
1071
1072 static ssize_t
1073 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1074                     char *buf)
1075 {
1076         struct scsi_device *sdev = to_scsi_device(dev);
1077         int i;
1078         ssize_t len = 0;
1079
1080         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1081                 const char *name = NULL;
1082
1083                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1084                         continue;
1085                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1086                         name = sdev_bflags_name[i];
1087
1088                 if (name)
1089                         len += scnprintf(buf + len, PAGE_SIZE - len,
1090                                          "%s%s", len ? " " : "", name);
1091                 else
1092                         len += scnprintf(buf + len, PAGE_SIZE - len,
1093                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1094         }
1095         if (len)
1096                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1097         return len;
1098 }
1099 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1100
1101 #ifdef CONFIG_SCSI_DH
1102 static ssize_t
1103 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1104                    char *buf)
1105 {
1106         struct scsi_device *sdev = to_scsi_device(dev);
1107
1108         if (!sdev->handler)
1109                 return snprintf(buf, 20, "detached\n");
1110
1111         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1112 }
1113
1114 static ssize_t
1115 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1116                     const char *buf, size_t count)
1117 {
1118         struct scsi_device *sdev = to_scsi_device(dev);
1119         int err = -EINVAL;
1120
1121         if (sdev->sdev_state == SDEV_CANCEL ||
1122             sdev->sdev_state == SDEV_DEL)
1123                 return -ENODEV;
1124
1125         if (!sdev->handler) {
1126                 /*
1127                  * Attach to a device handler
1128                  */
1129                 err = scsi_dh_attach(sdev->request_queue, buf);
1130         } else if (!strncmp(buf, "activate", 8)) {
1131                 /*
1132                  * Activate a device handler
1133                  */
1134                 if (sdev->handler->activate)
1135                         err = sdev->handler->activate(sdev, NULL, NULL);
1136                 else
1137                         err = 0;
1138         } else if (!strncmp(buf, "detach", 6)) {
1139                 /*
1140                  * Detach from a device handler
1141                  */
1142                 sdev_printk(KERN_WARNING, sdev,
1143                             "can't detach handler %s.\n",
1144                             sdev->handler->name);
1145                 err = -EINVAL;
1146         }
1147
1148         return err < 0 ? err : count;
1149 }
1150
1151 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1152                    sdev_store_dh_state);
1153
1154 static ssize_t
1155 sdev_show_access_state(struct device *dev,
1156                        struct device_attribute *attr,
1157                        char *buf)
1158 {
1159         struct scsi_device *sdev = to_scsi_device(dev);
1160         unsigned char access_state;
1161         const char *access_state_name;
1162
1163         if (!sdev->handler)
1164                 return -EINVAL;
1165
1166         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1167         access_state_name = scsi_access_state_name(access_state);
1168
1169         return sprintf(buf, "%s\n",
1170                        access_state_name ? access_state_name : "unknown");
1171 }
1172 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1173
1174 static ssize_t
1175 sdev_show_preferred_path(struct device *dev,
1176                          struct device_attribute *attr,
1177                          char *buf)
1178 {
1179         struct scsi_device *sdev = to_scsi_device(dev);
1180
1181         if (!sdev->handler)
1182                 return -EINVAL;
1183
1184         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1185                 return sprintf(buf, "1\n");
1186         else
1187                 return sprintf(buf, "0\n");
1188 }
1189 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1190 #endif
1191
1192 static ssize_t
1193 sdev_show_queue_ramp_up_period(struct device *dev,
1194                                struct device_attribute *attr,
1195                                char *buf)
1196 {
1197         struct scsi_device *sdev;
1198         sdev = to_scsi_device(dev);
1199         return snprintf(buf, 20, "%u\n",
1200                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1201 }
1202
1203 static ssize_t
1204 sdev_store_queue_ramp_up_period(struct device *dev,
1205                                 struct device_attribute *attr,
1206                                 const char *buf, size_t count)
1207 {
1208         struct scsi_device *sdev = to_scsi_device(dev);
1209         unsigned int period;
1210
1211         if (kstrtouint(buf, 10, &period))
1212                 return -EINVAL;
1213
1214         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1215         return count;
1216 }
1217
1218 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1219                    sdev_show_queue_ramp_up_period,
1220                    sdev_store_queue_ramp_up_period);
1221
1222 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1223                                          struct attribute *attr, int i)
1224 {
1225         struct device *dev = kobj_to_dev(kobj);
1226         struct scsi_device *sdev = to_scsi_device(dev);
1227
1228
1229         if (attr == &dev_attr_queue_depth.attr &&
1230             !sdev->host->hostt->change_queue_depth)
1231                 return S_IRUGO;
1232
1233         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1234             !sdev->host->hostt->change_queue_depth)
1235                 return 0;
1236
1237         return attr->mode;
1238 }
1239
1240 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1241                                              struct bin_attribute *attr, int i)
1242 {
1243         struct device *dev = kobj_to_dev(kobj);
1244         struct scsi_device *sdev = to_scsi_device(dev);
1245
1246
1247         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1248                 return 0;
1249
1250         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1251                 return 0;
1252
1253         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1254                 return 0;
1255
1256         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1257                 return 0;
1258
1259         if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1260                 return 0;
1261
1262         if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1263                 return 0;
1264
1265         if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1266                 return 0;
1267
1268         return S_IRUGO;
1269 }
1270
1271 /* Default template for device attributes.  May NOT be modified */
1272 static struct attribute *scsi_sdev_attrs[] = {
1273         &dev_attr_device_blocked.attr,
1274         &dev_attr_type.attr,
1275         &dev_attr_scsi_level.attr,
1276         &dev_attr_device_busy.attr,
1277         &dev_attr_vendor.attr,
1278         &dev_attr_model.attr,
1279         &dev_attr_rev.attr,
1280         &dev_attr_rescan.attr,
1281         &dev_attr_delete.attr,
1282         &dev_attr_state.attr,
1283         &dev_attr_timeout.attr,
1284         &dev_attr_eh_timeout.attr,
1285         &dev_attr_iocounterbits.attr,
1286         &dev_attr_iorequest_cnt.attr,
1287         &dev_attr_iodone_cnt.attr,
1288         &dev_attr_ioerr_cnt.attr,
1289         &dev_attr_iotmo_cnt.attr,
1290         &dev_attr_modalias.attr,
1291         &dev_attr_queue_depth.attr,
1292         &dev_attr_queue_type.attr,
1293         &dev_attr_wwid.attr,
1294         &dev_attr_blacklist.attr,
1295 #ifdef CONFIG_SCSI_DH
1296         &dev_attr_dh_state.attr,
1297         &dev_attr_access_state.attr,
1298         &dev_attr_preferred_path.attr,
1299 #endif
1300         &dev_attr_queue_ramp_up_period.attr,
1301         REF_EVT(media_change),
1302         REF_EVT(inquiry_change_reported),
1303         REF_EVT(capacity_change_reported),
1304         REF_EVT(soft_threshold_reached),
1305         REF_EVT(mode_parameter_change_reported),
1306         REF_EVT(lun_change_reported),
1307         NULL
1308 };
1309
1310 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1311         &dev_attr_vpd_pg0,
1312         &dev_attr_vpd_pg83,
1313         &dev_attr_vpd_pg80,
1314         &dev_attr_vpd_pg89,
1315         &dev_attr_vpd_pgb0,
1316         &dev_attr_vpd_pgb1,
1317         &dev_attr_vpd_pgb2,
1318         &dev_attr_inquiry,
1319         NULL
1320 };
1321 static struct attribute_group scsi_sdev_attr_group = {
1322         .attrs =        scsi_sdev_attrs,
1323         .bin_attrs =    scsi_sdev_bin_attrs,
1324         .is_visible =   scsi_sdev_attr_is_visible,
1325         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1326 };
1327
1328 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1329         &scsi_sdev_attr_group,
1330         NULL
1331 };
1332
1333 static int scsi_target_add(struct scsi_target *starget)
1334 {
1335         int error;
1336
1337         if (starget->state != STARGET_CREATED)
1338                 return 0;
1339
1340         error = device_add(&starget->dev);
1341         if (error) {
1342                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1343                 return error;
1344         }
1345         transport_add_device(&starget->dev);
1346         starget->state = STARGET_RUNNING;
1347
1348         pm_runtime_set_active(&starget->dev);
1349         pm_runtime_enable(&starget->dev);
1350         device_enable_async_suspend(&starget->dev);
1351
1352         return 0;
1353 }
1354
1355 /**
1356  * scsi_sysfs_add_sdev - add scsi device to sysfs
1357  * @sdev:       scsi_device to add
1358  *
1359  * Return value:
1360  *      0 on Success / non-zero on Failure
1361  **/
1362 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1363 {
1364         int error;
1365         struct scsi_target *starget = sdev->sdev_target;
1366
1367         error = scsi_target_add(starget);
1368         if (error)
1369                 return error;
1370
1371         transport_configure_device(&starget->dev);
1372
1373         device_enable_async_suspend(&sdev->sdev_gendev);
1374         scsi_autopm_get_target(starget);
1375         pm_runtime_set_active(&sdev->sdev_gendev);
1376         if (!sdev->rpm_autosuspend)
1377                 pm_runtime_forbid(&sdev->sdev_gendev);
1378         pm_runtime_enable(&sdev->sdev_gendev);
1379         scsi_autopm_put_target(starget);
1380
1381         scsi_autopm_get_device(sdev);
1382
1383         scsi_dh_add_device(sdev);
1384
1385         error = device_add(&sdev->sdev_gendev);
1386         if (error) {
1387                 sdev_printk(KERN_INFO, sdev,
1388                                 "failed to add device: %d\n", error);
1389                 return error;
1390         }
1391
1392         device_enable_async_suspend(&sdev->sdev_dev);
1393         error = device_add(&sdev->sdev_dev);
1394         if (error) {
1395                 sdev_printk(KERN_INFO, sdev,
1396                                 "failed to add class device: %d\n", error);
1397                 device_del(&sdev->sdev_gendev);
1398                 return error;
1399         }
1400         transport_add_device(&sdev->sdev_gendev);
1401         sdev->is_visible = 1;
1402
1403         if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1404                 sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1405                 if (IS_ERR(sdev->bsg_dev)) {
1406                         error = PTR_ERR(sdev->bsg_dev);
1407                         sdev_printk(KERN_INFO, sdev,
1408                                     "Failed to register bsg queue, errno=%d\n",
1409                                     error);
1410                         sdev->bsg_dev = NULL;
1411                 }
1412         }
1413
1414         scsi_autopm_put_device(sdev);
1415         return error;
1416 }
1417
1418 void __scsi_remove_device(struct scsi_device *sdev)
1419 {
1420         struct device *dev = &sdev->sdev_gendev;
1421         int res;
1422
1423         /*
1424          * This cleanup path is not reentrant and while it is impossible
1425          * to get a new reference with scsi_device_get() someone can still
1426          * hold a previously acquired one.
1427          */
1428         if (sdev->sdev_state == SDEV_DEL)
1429                 return;
1430
1431         if (sdev->is_visible) {
1432                 /*
1433                  * If scsi_internal_target_block() is running concurrently,
1434                  * wait until it has finished before changing the device state.
1435                  */
1436                 mutex_lock(&sdev->state_mutex);
1437                 /*
1438                  * If blocked, we go straight to DEL and restart the queue so
1439                  * any commands issued during driver shutdown (like sync
1440                  * cache) are errored immediately.
1441                  */
1442                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1443                 if (res != 0) {
1444                         res = scsi_device_set_state(sdev, SDEV_DEL);
1445                         if (res == 0)
1446                                 scsi_start_queue(sdev);
1447                 }
1448                 mutex_unlock(&sdev->state_mutex);
1449
1450                 if (res != 0)
1451                         return;
1452
1453                 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1454                         bsg_unregister_queue(sdev->bsg_dev);
1455                 device_unregister(&sdev->sdev_dev);
1456                 transport_remove_device(dev);
1457                 device_del(dev);
1458         } else
1459                 put_device(&sdev->sdev_dev);
1460
1461         /*
1462          * Stop accepting new requests and wait until all queuecommand() and
1463          * scsi_run_queue() invocations have finished before tearing down the
1464          * device.
1465          */
1466         mutex_lock(&sdev->state_mutex);
1467         scsi_device_set_state(sdev, SDEV_DEL);
1468         mutex_unlock(&sdev->state_mutex);
1469
1470         blk_mq_destroy_queue(sdev->request_queue);
1471         kref_put(&sdev->host->tagset_refcnt, scsi_mq_free_tags);
1472         cancel_work_sync(&sdev->requeue_work);
1473
1474         if (sdev->host->hostt->slave_destroy)
1475                 sdev->host->hostt->slave_destroy(sdev);
1476         transport_destroy_device(dev);
1477
1478         /*
1479          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1480          * removed sysfs visibility from the device, so make the target
1481          * invisible if this was the last device underneath it.
1482          */
1483         scsi_target_reap(scsi_target(sdev));
1484
1485         put_device(dev);
1486 }
1487
1488 /**
1489  * scsi_remove_device - unregister a device from the scsi bus
1490  * @sdev:       scsi_device to unregister
1491  **/
1492 void scsi_remove_device(struct scsi_device *sdev)
1493 {
1494         struct Scsi_Host *shost = sdev->host;
1495
1496         mutex_lock(&shost->scan_mutex);
1497         __scsi_remove_device(sdev);
1498         mutex_unlock(&shost->scan_mutex);
1499 }
1500 EXPORT_SYMBOL(scsi_remove_device);
1501
1502 static void __scsi_remove_target(struct scsi_target *starget)
1503 {
1504         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1505         unsigned long flags;
1506         struct scsi_device *sdev;
1507
1508         spin_lock_irqsave(shost->host_lock, flags);
1509  restart:
1510         list_for_each_entry(sdev, &shost->__devices, siblings) {
1511                 /*
1512                  * We cannot call scsi_device_get() here, as
1513                  * we might've been called from rmmod() causing
1514                  * scsi_device_get() to fail the module_is_live()
1515                  * check.
1516                  */
1517                 if (sdev->channel != starget->channel ||
1518                     sdev->id != starget->id)
1519                         continue;
1520                 if (sdev->sdev_state == SDEV_DEL ||
1521                     sdev->sdev_state == SDEV_CANCEL ||
1522                     !get_device(&sdev->sdev_gendev))
1523                         continue;
1524                 spin_unlock_irqrestore(shost->host_lock, flags);
1525                 scsi_remove_device(sdev);
1526                 put_device(&sdev->sdev_gendev);
1527                 spin_lock_irqsave(shost->host_lock, flags);
1528                 goto restart;
1529         }
1530         spin_unlock_irqrestore(shost->host_lock, flags);
1531 }
1532
1533 /**
1534  * scsi_remove_target - try to remove a target and all its devices
1535  * @dev: generic starget or parent of generic stargets to be removed
1536  *
1537  * Note: This is slightly racy.  It is possible that if the user
1538  * requests the addition of another device then the target won't be
1539  * removed.
1540  */
1541 void scsi_remove_target(struct device *dev)
1542 {
1543         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1544         struct scsi_target *starget;
1545         unsigned long flags;
1546
1547 restart:
1548         spin_lock_irqsave(shost->host_lock, flags);
1549         list_for_each_entry(starget, &shost->__targets, siblings) {
1550                 if (starget->state == STARGET_DEL ||
1551                     starget->state == STARGET_REMOVE ||
1552                     starget->state == STARGET_CREATED_REMOVE)
1553                         continue;
1554                 if (starget->dev.parent == dev || &starget->dev == dev) {
1555                         kref_get(&starget->reap_ref);
1556                         if (starget->state == STARGET_CREATED)
1557                                 starget->state = STARGET_CREATED_REMOVE;
1558                         else
1559                                 starget->state = STARGET_REMOVE;
1560                         spin_unlock_irqrestore(shost->host_lock, flags);
1561                         __scsi_remove_target(starget);
1562                         scsi_target_reap(starget);
1563                         goto restart;
1564                 }
1565         }
1566         spin_unlock_irqrestore(shost->host_lock, flags);
1567 }
1568 EXPORT_SYMBOL(scsi_remove_target);
1569
1570 int scsi_register_driver(struct device_driver *drv)
1571 {
1572         drv->bus = &scsi_bus_type;
1573
1574         return driver_register(drv);
1575 }
1576 EXPORT_SYMBOL(scsi_register_driver);
1577
1578 int scsi_register_interface(struct class_interface *intf)
1579 {
1580         intf->class = &sdev_class;
1581
1582         return class_interface_register(intf);
1583 }
1584 EXPORT_SYMBOL(scsi_register_interface);
1585
1586 /**
1587  * scsi_sysfs_add_host - add scsi host to subsystem
1588  * @shost:     scsi host struct to add to subsystem
1589  **/
1590 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1591 {
1592         transport_register_device(&shost->shost_gendev);
1593         transport_configure_device(&shost->shost_gendev);
1594         return 0;
1595 }
1596
1597 static struct device_type scsi_dev_type = {
1598         .name =         "scsi_device",
1599         .release =      scsi_device_dev_release,
1600         .groups =       scsi_sdev_attr_groups,
1601 };
1602
1603 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1604 {
1605         unsigned long flags;
1606         struct Scsi_Host *shost = sdev->host;
1607         struct scsi_host_template *hostt = shost->hostt;
1608         struct scsi_target  *starget = sdev->sdev_target;
1609
1610         device_initialize(&sdev->sdev_gendev);
1611         sdev->sdev_gendev.bus = &scsi_bus_type;
1612         sdev->sdev_gendev.type = &scsi_dev_type;
1613         scsi_enable_async_suspend(&sdev->sdev_gendev);
1614         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1615                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1616         sdev->sdev_gendev.groups = hostt->sdev_groups;
1617
1618         device_initialize(&sdev->sdev_dev);
1619         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1620         sdev->sdev_dev.class = &sdev_class;
1621         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1622                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1623         /*
1624          * Get a default scsi_level from the target (derived from sibling
1625          * devices).  This is the best we can do for guessing how to set
1626          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1627          * setting doesn't matter, because all the bits are zero anyway.
1628          * But it does matter for higher LUNs.
1629          */
1630         sdev->scsi_level = starget->scsi_level;
1631         if (sdev->scsi_level <= SCSI_2 &&
1632                         sdev->scsi_level != SCSI_UNKNOWN &&
1633                         !shost->no_scsi2_lun_in_cdb)
1634                 sdev->lun_in_cdb = 1;
1635
1636         transport_setup_device(&sdev->sdev_gendev);
1637         spin_lock_irqsave(shost->host_lock, flags);
1638         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1639         list_add_tail(&sdev->siblings, &shost->__devices);
1640         spin_unlock_irqrestore(shost->host_lock, flags);
1641         /*
1642          * device can now only be removed via __scsi_remove_device() so hold
1643          * the target.  Target will be held in CREATED state until something
1644          * beneath it becomes visible (in which case it moves to RUNNING)
1645          */
1646         kref_get(&starget->reap_ref);
1647 }
1648
1649 int scsi_is_sdev_device(const struct device *dev)
1650 {
1651         return dev->type == &scsi_dev_type;
1652 }
1653 EXPORT_SYMBOL(scsi_is_sdev_device);
1654
1655 /* A blank transport template that is used in drivers that don't
1656  * yet implement Transport Attributes */
1657 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };