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, "%hd\n");
 374 shost_rd_attr(sg_tablesize, "%hu\n");
 375 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 376 shost_rd_attr(unchecked_isa_dma, "%d\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 struct attribute *scsi_sysfs_shost_attrs[] = {
 397         &dev_attr_use_blk_mq.attr,
 398         &dev_attr_unique_id.attr,
 399         &dev_attr_host_busy.attr,
 400         &dev_attr_cmd_per_lun.attr,
 401         &dev_attr_can_queue.attr,
 402         &dev_attr_sg_tablesize.attr,
 403         &dev_attr_sg_prot_tablesize.attr,
 404         &dev_attr_unchecked_isa_dma.attr,
 405         &dev_attr_proc_name.attr,
 406         &dev_attr_scan.attr,
 407         &dev_attr_hstate.attr,
 408         &dev_attr_supported_mode.attr,
 409         &dev_attr_active_mode.attr,
 410         &dev_attr_prot_capabilities.attr,
 411         &dev_attr_prot_guard_type.attr,
 412         &dev_attr_host_reset.attr,
 413         &dev_attr_eh_deadline.attr,
 414         NULL
 415 };
 416
 417 static struct attribute_group scsi_shost_attr_group = {
 418         .attrs =        scsi_sysfs_shost_attrs,
 419 };
 420
 421 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 422         &scsi_shost_attr_group,
 423         NULL
 424 };
 425
 426 static void scsi_device_cls_release(struct device *class_dev)
 427 {
 428         struct scsi_device *sdev;
 429
 430         sdev = class_to_sdev(class_dev);
 431         put_device(&sdev->sdev_gendev);
 432 }
 433
 434 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 435 {
 436         struct scsi_device *sdev;
 437         struct device *parent;
 438         struct list_head *this, *tmp;
 439         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 440         unsigned long flags;
 441
 442         sdev = container_of(work, struct scsi_device, ew.work);
 443
 444         scsi_dh_release_device(sdev);
 445
 446         parent = sdev->sdev_gendev.parent;
 447
 448         spin_lock_irqsave(sdev->host->host_lock, flags);
 449         list_del(&sdev->siblings);
 450         list_del(&sdev->same_target_siblings);
 451         list_del(&sdev->starved_entry);
 452         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 453
 454         cancel_work_sync(&sdev->event_work);
 455
 456         list_for_each_safe(this, tmp, &sdev->event_list) {
 457                 struct scsi_event *evt;
 458
 459                 evt = list_entry(this, struct scsi_event, node);
 460                 list_del(&evt->node);
 461                 kfree(evt);
 462         }
 463
 464         blk_put_queue(sdev->request_queue);
 465         /* NULL queue means the device can't be used */
 466         sdev->request_queue = NULL;
 467
 468         mutex_lock(&sdev->inquiry_mutex);
 469         rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
 470                            lockdep_is_held(&sdev->inquiry_mutex));
 471         rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
 472                            lockdep_is_held(&sdev->inquiry_mutex));
 473         mutex_unlock(&sdev->inquiry_mutex);
 474
 475         if (vpd_pg83)
 476                 kfree_rcu(vpd_pg83, rcu);
 477         if (vpd_pg80)
 478                 kfree_rcu(vpd_pg80, rcu);
 479         kfree(sdev->inquiry);
 480         kfree(sdev);
 481
 482         if (parent)
 483                 put_device(parent);
 484 }
 485
 486 static void scsi_device_dev_release(struct device *dev)
 487 {
 488         struct scsi_device *sdp = to_scsi_device(dev);
 489         execute_in_process_context(scsi_device_dev_release_usercontext,
 490                                    &sdp->ew);
 491 }
 492
 493 static struct class sdev_class = {
 494         .name           = "scsi_device",
 495         .dev_release    = scsi_device_cls_release,
 496 };
 497
 498 /* all probing is done in the individual ->probe routines */
 499 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 500 {
 501         struct scsi_device *sdp;
 502
 503         if (dev->type != &scsi_dev_type)
 504                 return 0;
 505
 506         sdp = to_scsi_device(dev);
 507         if (sdp->no_uld_attach)
 508                 return 0;
 509         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 510 }
 511
 512 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 513 {
 514         struct scsi_device *sdev;
 515
 516         if (dev->type != &scsi_dev_type)
 517                 return 0;
 518
 519         sdev = to_scsi_device(dev);
 520
 521         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 522         return 0;
 523 }
 524
 525 struct bus_type scsi_bus_type = {
 526         .name           = "scsi",
 527         .match          = scsi_bus_match,
 528         .uevent         = scsi_bus_uevent,
 529 #ifdef CONFIG_PM
 530         .pm             = &scsi_bus_pm_ops,
 531 #endif
 532 };
 533 EXPORT_SYMBOL_GPL(scsi_bus_type);
 534
 535 int scsi_sysfs_register(void)
 536 {
 537         int error;
 538
 539         error = bus_register(&scsi_bus_type);
 540         if (!error) {
 541                 error = class_register(&sdev_class);
 542                 if (error)
 543                         bus_unregister(&scsi_bus_type);
 544         }
 545
 546         return error;
 547 }
 548
 549 void scsi_sysfs_unregister(void)
 550 {
 551         class_unregister(&sdev_class);
 552         bus_unregister(&scsi_bus_type);
 553 }
 554
 555 /*
 556  * sdev_show_function: macro to create an attr function that can be used to
 557  * show a non-bit field.
 558  */
 559 #define sdev_show_function(field, format_string)                                \
 560 static ssize_t                                                          \
 561 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 562                    char *buf)                                           \
 563 {                                                                       \
 564         struct scsi_device *sdev;                                       \
 565         sdev = to_scsi_device(dev);                                     \
 566         return snprintf (buf, 20, format_string, sdev->field);          \
 567 }                                                                       \
 568
 569 /*
 570  * sdev_rd_attr: macro to create a function and attribute variable for a
 571  * read only field.
 572  */
 573 #define sdev_rd_attr(field, format_string)                              \
 574         sdev_show_function(field, format_string)                        \
 575 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 576
 577
 578 /*
 579  * sdev_rw_attr: create a function and attribute variable for a
 580  * read/write field.
 581  */
 582 #define sdev_rw_attr(field, format_string)                              \
 583         sdev_show_function(field, format_string)                                \
 584                                                                         \
 585 static ssize_t                                                          \
 586 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 587                     const char *buf, size_t count)                      \
 588 {                                                                       \
 589         struct scsi_device *sdev;                                       \
 590         sdev = to_scsi_device(dev);                                     \
 591         sscanf (buf, format_string, &sdev->field);                      \
 592         return count;                                                   \
 593 }                                                                       \
 594 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 595
 596 /* Currently we don't export bit fields, but we might in future,
 597  * so leave this code in */
 598 #if 0
 599 /*
 600  * sdev_rd_attr: create a function and attribute variable for a
 601  * read/write bit field.
 602  */
 603 #define sdev_rw_attr_bit(field)                                         \
 604         sdev_show_function(field, "%d\n")                                       \
 605                                                                         \
 606 static ssize_t                                                          \
 607 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 608                     const char *buf, size_t count)                      \
 609 {                                                                       \
 610         int ret;                                                        \
 611         struct scsi_device *sdev;                                       \
 612         ret = scsi_sdev_check_buf_bit(buf);                             \
 613         if (ret >= 0)   {                                               \
 614                 sdev = to_scsi_device(dev);                             \
 615                 sdev->field = ret;                                      \
 616                 ret = count;                                            \
 617         }                                                               \
 618         return ret;                                                     \
 619 }                                                                       \
 620 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 621
 622 /*
 623  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 624  * else return -EINVAL.
 625  */
 626 static int scsi_sdev_check_buf_bit(const char *buf)
 627 {
 628         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 629                 if (buf[0] == '1')
 630                         return 1;
 631                 else if (buf[0] == '0')
 632                         return 0;
 633                 else
 634                         return -EINVAL;
 635         } else
 636                 return -EINVAL;
 637 }
 638 #endif
 639 /*
 640  * Create the actual show/store functions and data structures.
 641  */
 642 sdev_rd_attr (type, "%d\n");
 643 sdev_rd_attr (scsi_level, "%d\n");
 644 sdev_rd_attr (vendor, "%.8s\n");
 645 sdev_rd_attr (model, "%.16s\n");
 646 sdev_rd_attr (rev, "%.4s\n");
 647
 648 static ssize_t
 649 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 650                 char *buf)
 651 {
 652         struct scsi_device *sdev = to_scsi_device(dev);
 653         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
 654 }
 655 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 656
 657 static ssize_t
 658 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 659                 char *buf)
 660 {
 661         struct scsi_device *sdev = to_scsi_device(dev);
 662         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 663 }
 664 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 665
 666 /*
 667  * TODO: can we make these symlinks to the block layer ones?
 668  */
 669 static ssize_t
 670 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 671 {
 672         struct scsi_device *sdev;
 673         sdev = to_scsi_device(dev);
 674         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 675 }
 676
 677 static ssize_t
 678 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 679                     const char *buf, size_t count)
 680 {
 681         struct scsi_device *sdev;
 682         int timeout;
 683         sdev = to_scsi_device(dev);
 684         sscanf (buf, "%d\n", &timeout);
 685         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 686         return count;
 687 }
 688 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 689
 690 static ssize_t
 691 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 692 {
 693         struct scsi_device *sdev;
 694         sdev = to_scsi_device(dev);
 695         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 696 }
 697
 698 static ssize_t
 699 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 700                     const char *buf, size_t count)
 701 {
 702         struct scsi_device *sdev;
 703         unsigned int eh_timeout;
 704         int err;
 705
 706         if (!capable(CAP_SYS_ADMIN))
 707                 return -EACCES;
 708
 709         sdev = to_scsi_device(dev);
 710         err = kstrtouint(buf, 10, &eh_timeout);
 711         if (err)
 712                 return err;
 713         sdev->eh_timeout = eh_timeout * HZ;
 714
 715         return count;
 716 }
 717 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 718
 719 static ssize_t
 720 store_rescan_field (struct device *dev, struct device_attribute *attr,
 721                     const char *buf, size_t count)
 722 {
 723         scsi_rescan_device(dev);
 724         return count;
 725 }
 726 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 727
 728 static ssize_t
 729 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 730                   const char *buf, size_t count)
 731 {
 732         struct kernfs_node *kn;
 733
 734         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 735         WARN_ON_ONCE(!kn);
 736         /*
 737          * Concurrent writes into the "delete" sysfs attribute may trigger
 738          * concurrent calls to device_remove_file() and scsi_remove_device().
 739          * device_remove_file() handles concurrent removal calls by
 740          * serializing these and by ignoring the second and later removal
 741          * attempts.  Concurrent calls of scsi_remove_device() are
 742          * serialized. The second and later calls of scsi_remove_device() are
 743          * ignored because the first call of that function changes the device
 744          * state into SDEV_DEL.
 745          */
 746         device_remove_file(dev, attr);
 747         scsi_remove_device(to_scsi_device(dev));
 748         if (kn)
 749                 sysfs_unbreak_active_protection(kn);
 750         return count;
 751 };
 752 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 753
 754 static ssize_t
 755 store_state_field(struct device *dev, struct device_attribute *attr,
 756                   const char *buf, size_t count)
 757 {
 758         int i, ret;
 759         struct scsi_device *sdev = to_scsi_device(dev);
 760         enum scsi_device_state state = 0;
 761
 762         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 763                 const int len = strlen(sdev_states[i].name);
 764                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 765                    buf[len] == '\n') {
 766                         state = sdev_states[i].value;
 767                         break;
 768                 }
 769         }
 770         switch (state) {
 771         case SDEV_RUNNING:
 772         case SDEV_OFFLINE:
 773                 break;
 774         default:
 775                 return -EINVAL;
 776         }
 777
 778         mutex_lock(&sdev->state_mutex);
 779         ret = scsi_device_set_state(sdev, state);
 780         /*
 781          * If the device state changes to SDEV_RUNNING, we need to run
 782          * the queue to avoid I/O hang.
 783          */
 784         if (ret == 0 && state == SDEV_RUNNING)
 785                 blk_mq_run_hw_queues(sdev->request_queue, true);
 786         mutex_unlock(&sdev->state_mutex);
 787
 788         return ret == 0 ? count : -EINVAL;
 789 }
 790
 791 static ssize_t
 792 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 793 {
 794         struct scsi_device *sdev = to_scsi_device(dev);
 795         const char *name = scsi_device_state_name(sdev->sdev_state);
 796
 797         if (!name)
 798                 return -EINVAL;
 799
 800         return snprintf(buf, 20, "%s\n", name);
 801 }
 802
 803 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 804
 805 static ssize_t
 806 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 807                       char *buf)
 808 {
 809         struct scsi_device *sdev = to_scsi_device(dev);
 810         const char *name = "none";
 811
 812         if (sdev->simple_tags)
 813                 name = "simple";
 814
 815         return snprintf(buf, 20, "%s\n", name);
 816 }
 817
 818 static ssize_t
 819 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 820                        const char *buf, size_t count)
 821 {
 822         struct scsi_device *sdev = to_scsi_device(dev);
 823
 824         if (!sdev->tagged_supported)
 825                 return -EINVAL;
 826
 827         sdev_printk(KERN_INFO, sdev,
 828                     "ignoring write to deprecated queue_type attribute");
 829         return count;
 830 }
 831
 832 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 833                    store_queue_type_field);
 834
 835 #define sdev_vpd_pg_attr(_page)                                         \
 836 static ssize_t                                                  \
 837 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 838                  struct bin_attribute *bin_attr,                        \
 839                  char *buf, loff_t off, size_t count)                   \
 840 {                                                                       \
 841         struct device *dev = container_of(kobj, struct device, kobj);   \
 842         struct scsi_device *sdev = to_scsi_device(dev);                 \
 843         struct scsi_vpd *vpd_page;                                      \
 844         int ret = -EINVAL;                                              \
 845                                                                         \
 846         rcu_read_lock();                                                \
 847         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 848         if (vpd_page)                                                   \
 849                 ret = memory_read_from_buffer(buf, count, &off,         \
 850                                 vpd_page->data, vpd_page->len);         \
 851         rcu_read_unlock();                                              \
 852         return ret;                                                     \
 853 }                                                                       \
 854 static struct bin_attribute dev_attr_vpd_##_page = {            \
 855         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 856         .size = 0,                                                      \
 857         .read = show_vpd_##_page,                                       \
 858 };
 859
 860 sdev_vpd_pg_attr(pg83);
 861 sdev_vpd_pg_attr(pg80);
 862
 863 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 864                             struct bin_attribute *bin_attr,
 865                             char *buf, loff_t off, size_t count)
 866 {
 867         struct device *dev = container_of(kobj, struct device, kobj);
 868         struct scsi_device *sdev = to_scsi_device(dev);
 869
 870         if (!sdev->inquiry)
 871                 return -EINVAL;
 872
 873         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 874                                        sdev->inquiry_len);
 875 }
 876
 877 static struct bin_attribute dev_attr_inquiry = {
 878         .attr = {
 879                 .name = "inquiry",
 880                 .mode = S_IRUGO,
 881         },
 882         .size = 0,
 883         .read = show_inquiry,
 884 };
 885
 886 static ssize_t
 887 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 888                         char *buf)
 889 {
 890         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 891 }
 892
 893 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 894
 895 #define show_sdev_iostat(field)                                         \
 896 static ssize_t                                                          \
 897 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 898                     char *buf)                                          \
 899 {                                                                       \
 900         struct scsi_device *sdev = to_scsi_device(dev);                 \
 901         unsigned long long count = atomic_read(&sdev->field);           \
 902         return snprintf(buf, 20, "0x%llx\n", count);                    \
 903 }                                                                       \
 904 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 905
 906 show_sdev_iostat(iorequest_cnt);
 907 show_sdev_iostat(iodone_cnt);
 908 show_sdev_iostat(ioerr_cnt);
 909
 910 static ssize_t
 911 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 912 {
 913         struct scsi_device *sdev;
 914         sdev = to_scsi_device(dev);
 915         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 916 }
 917 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 918
 919 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 920 static ssize_t                                                          \
 921 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 922                      char *buf)                                         \
 923 {                                                                       \
 924         struct scsi_device *sdev = to_scsi_device(dev);                 \
 925         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 926         return snprintf(buf, 20, "%d\n", val);                          \
 927 }
 928
 929 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 930 static ssize_t                                                          \
 931 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 932                       const char *buf, size_t count)                    \
 933 {                                                                       \
 934         struct scsi_device *sdev = to_scsi_device(dev);                 \
 935         int val = simple_strtoul(buf, NULL, 0);                         \
 936         if (val == 0)                                                   \
 937                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 938         else if (val == 1)                                              \
 939                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 940         else                                                            \
 941                 return -EINVAL;                                         \
 942         return count;                                                   \
 943 }
 944
 945 #define DECLARE_EVT(name, Cap_name)                                     \
 946         DECLARE_EVT_SHOW(name, Cap_name)                                \
 947         DECLARE_EVT_STORE(name, Cap_name)                               \
 948         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 949                            sdev_store_evt_##name);
 950 #define REF_EVT(name) &dev_attr_evt_##name.attr
 951
 952 DECLARE_EVT(media_change, MEDIA_CHANGE)
 953 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 954 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 955 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 956 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 957 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 958
 959 static ssize_t
 960 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 961                        const char *buf, size_t count)
 962 {
 963         int depth, retval;
 964         struct scsi_device *sdev = to_scsi_device(dev);
 965         struct scsi_host_template *sht = sdev->host->hostt;
 966
 967         if (!sht->change_queue_depth)
 968                 return -EINVAL;
 969
 970         depth = simple_strtoul(buf, NULL, 0);
 971
 972         if (depth < 1 || depth > sdev->host->can_queue)
 973                 return -EINVAL;
 974
 975         retval = sht->change_queue_depth(sdev, depth);
 976         if (retval < 0)
 977                 return retval;
 978
 979         sdev->max_queue_depth = sdev->queue_depth;
 980
 981         return count;
 982 }
 983 sdev_show_function(queue_depth, "%d\n");
 984
 985 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 986                    sdev_store_queue_depth);
 987
 988 static ssize_t
 989 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
 990                     char *buf)
 991 {
 992         struct scsi_device *sdev = to_scsi_device(dev);
 993         ssize_t count;
 994
 995         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
 996         if (count > 0) {
 997                 buf[count] = '\n';
 998                 count++;
 999         }
1000         return count;
1001 }
1002 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1003
1004 #define BLIST_FLAG_NAME(name)                                   \
1005         [const_ilog2((__force __u64)BLIST_##name)] = #name
1006 static const char *const sdev_bflags_name[] = {
1007 #include "scsi_devinfo_tbl.c"
1008 };
1009 #undef BLIST_FLAG_NAME
1010
1011 static ssize_t
1012 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1013                     char *buf)
1014 {
1015         struct scsi_device *sdev = to_scsi_device(dev);
1016         int i;
1017         ssize_t len = 0;
1018
1019         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1020                 const char *name = NULL;
1021
1022                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1023                         continue;
1024                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1025                         name = sdev_bflags_name[i];
1026
1027                 if (name)
1028                         len += snprintf(buf + len, PAGE_SIZE - len,
1029                                         "%s%s", len ? " " : "", name);
1030                 else
1031                         len += snprintf(buf + len, PAGE_SIZE - len,
1032                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
1033         }
1034         if (len)
1035                 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1036         return len;
1037 }
1038 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1039
1040 #ifdef CONFIG_SCSI_DH
1041 static ssize_t
1042 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1043                    char *buf)
1044 {
1045         struct scsi_device *sdev = to_scsi_device(dev);
1046
1047         if (!sdev->handler)
1048                 return snprintf(buf, 20, "detached\n");
1049
1050         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1051 }
1052
1053 static ssize_t
1054 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1055                     const char *buf, size_t count)
1056 {
1057         struct scsi_device *sdev = to_scsi_device(dev);
1058         int err = -EINVAL;
1059
1060         if (sdev->sdev_state == SDEV_CANCEL ||
1061             sdev->sdev_state == SDEV_DEL)
1062                 return -ENODEV;
1063
1064         if (!sdev->handler) {
1065                 /*
1066                  * Attach to a device handler
1067                  */
1068                 err = scsi_dh_attach(sdev->request_queue, buf);
1069         } else if (!strncmp(buf, "activate", 8)) {
1070                 /*
1071                  * Activate a device handler
1072                  */
1073                 if (sdev->handler->activate)
1074                         err = sdev->handler->activate(sdev, NULL, NULL);
1075                 else
1076                         err = 0;
1077         } else if (!strncmp(buf, "detach", 6)) {
1078                 /*
1079                  * Detach from a device handler
1080                  */
1081                 sdev_printk(KERN_WARNING, sdev,
1082                             "can't detach handler %s.\n",
1083                             sdev->handler->name);
1084                 err = -EINVAL;
1085         }
1086
1087         return err < 0 ? err : count;
1088 }
1089
1090 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1091                    sdev_store_dh_state);
1092
1093 static ssize_t
1094 sdev_show_access_state(struct device *dev,
1095                        struct device_attribute *attr,
1096                        char *buf)
1097 {
1098         struct scsi_device *sdev = to_scsi_device(dev);
1099         unsigned char access_state;
1100         const char *access_state_name;
1101
1102         if (!sdev->handler)
1103                 return -EINVAL;
1104
1105         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1106         access_state_name = scsi_access_state_name(access_state);
1107
1108         return sprintf(buf, "%s\n",
1109                        access_state_name ? access_state_name : "unknown");
1110 }
1111 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1112
1113 static ssize_t
1114 sdev_show_preferred_path(struct device *dev,
1115                          struct device_attribute *attr,
1116                          char *buf)
1117 {
1118         struct scsi_device *sdev = to_scsi_device(dev);
1119
1120         if (!sdev->handler)
1121                 return -EINVAL;
1122
1123         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1124                 return sprintf(buf, "1\n");
1125         else
1126                 return sprintf(buf, "0\n");
1127 }
1128 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1129 #endif
1130
1131 static ssize_t
1132 sdev_show_queue_ramp_up_period(struct device *dev,
1133                                struct device_attribute *attr,
1134                                char *buf)
1135 {
1136         struct scsi_device *sdev;
1137         sdev = to_scsi_device(dev);
1138         return snprintf(buf, 20, "%u\n",
1139                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1140 }
1141
1142 static ssize_t
1143 sdev_store_queue_ramp_up_period(struct device *dev,
1144                                 struct device_attribute *attr,
1145                                 const char *buf, size_t count)
1146 {
1147         struct scsi_device *sdev = to_scsi_device(dev);
1148         unsigned int period;
1149
1150         if (kstrtouint(buf, 10, &period))
1151                 return -EINVAL;
1152
1153         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1154         return count;
1155 }
1156
1157 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1158                    sdev_show_queue_ramp_up_period,
1159                    sdev_store_queue_ramp_up_period);
1160
1161 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1162                                          struct attribute *attr, int i)
1163 {
1164         struct device *dev = container_of(kobj, struct device, kobj);
1165         struct scsi_device *sdev = to_scsi_device(dev);
1166
1167
1168         if (attr == &dev_attr_queue_depth.attr &&
1169             !sdev->host->hostt->change_queue_depth)
1170                 return S_IRUGO;
1171
1172         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1173             !sdev->host->hostt->change_queue_depth)
1174                 return 0;
1175
1176 #ifdef CONFIG_SCSI_DH
1177         if (attr == &dev_attr_access_state.attr &&
1178             !sdev->handler)
1179                 return 0;
1180         if (attr == &dev_attr_preferred_path.attr &&
1181             !sdev->handler)
1182                 return 0;
1183 #endif
1184         return attr->mode;
1185 }
1186
1187 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1188                                              struct bin_attribute *attr, int i)
1189 {
1190         struct device *dev = container_of(kobj, struct device, kobj);
1191         struct scsi_device *sdev = to_scsi_device(dev);
1192
1193
1194         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1195                 return 0;
1196
1197         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1198                 return 0;
1199
1200         return S_IRUGO;
1201 }
1202
1203 /* Default template for device attributes.  May NOT be modified */
1204 static struct attribute *scsi_sdev_attrs[] = {
1205         &dev_attr_device_blocked.attr,
1206         &dev_attr_type.attr,
1207         &dev_attr_scsi_level.attr,
1208         &dev_attr_device_busy.attr,
1209         &dev_attr_vendor.attr,
1210         &dev_attr_model.attr,
1211         &dev_attr_rev.attr,
1212         &dev_attr_rescan.attr,
1213         &dev_attr_delete.attr,
1214         &dev_attr_state.attr,
1215         &dev_attr_timeout.attr,
1216         &dev_attr_eh_timeout.attr,
1217         &dev_attr_iocounterbits.attr,
1218         &dev_attr_iorequest_cnt.attr,
1219         &dev_attr_iodone_cnt.attr,
1220         &dev_attr_ioerr_cnt.attr,
1221         &dev_attr_modalias.attr,
1222         &dev_attr_queue_depth.attr,
1223         &dev_attr_queue_type.attr,
1224         &dev_attr_wwid.attr,
1225         &dev_attr_blacklist.attr,
1226 #ifdef CONFIG_SCSI_DH
1227         &dev_attr_dh_state.attr,
1228         &dev_attr_access_state.attr,
1229         &dev_attr_preferred_path.attr,
1230 #endif
1231         &dev_attr_queue_ramp_up_period.attr,
1232         REF_EVT(media_change),
1233         REF_EVT(inquiry_change_reported),
1234         REF_EVT(capacity_change_reported),
1235         REF_EVT(soft_threshold_reached),
1236         REF_EVT(mode_parameter_change_reported),
1237         REF_EVT(lun_change_reported),
1238         NULL
1239 };
1240
1241 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1242         &dev_attr_vpd_pg83,
1243         &dev_attr_vpd_pg80,
1244         &dev_attr_inquiry,
1245         NULL
1246 };
1247 static struct attribute_group scsi_sdev_attr_group = {
1248         .attrs =        scsi_sdev_attrs,
1249         .bin_attrs =    scsi_sdev_bin_attrs,
1250         .is_visible =   scsi_sdev_attr_is_visible,
1251         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1252 };
1253
1254 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1255         &scsi_sdev_attr_group,
1256         NULL
1257 };
1258
1259 static int scsi_target_add(struct scsi_target *starget)
1260 {
1261         int error;
1262
1263         if (starget->state != STARGET_CREATED)
1264                 return 0;
1265
1266         error = device_add(&starget->dev);
1267         if (error) {
1268                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1269                 return error;
1270         }
1271         transport_add_device(&starget->dev);
1272         starget->state = STARGET_RUNNING;
1273
1274         pm_runtime_set_active(&starget->dev);
1275         pm_runtime_enable(&starget->dev);
1276         device_enable_async_suspend(&starget->dev);
1277
1278         return 0;
1279 }
1280
1281 /**
1282  * scsi_sysfs_add_sdev - add scsi device to sysfs
1283  * @sdev:       scsi_device to add
1284  *
1285  * Return value:
1286  *      0 on Success / non-zero on Failure
1287  **/
1288 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1289 {
1290         int error, i;
1291         struct request_queue *rq = sdev->request_queue;
1292         struct scsi_target *starget = sdev->sdev_target;
1293
1294         error = scsi_target_add(starget);
1295         if (error)
1296                 return error;
1297
1298         transport_configure_device(&starget->dev);
1299
1300         device_enable_async_suspend(&sdev->sdev_gendev);
1301         scsi_autopm_get_target(starget);
1302         pm_runtime_set_active(&sdev->sdev_gendev);
1303         pm_runtime_forbid(&sdev->sdev_gendev);
1304         pm_runtime_enable(&sdev->sdev_gendev);
1305         scsi_autopm_put_target(starget);
1306
1307         scsi_autopm_get_device(sdev);
1308
1309         scsi_dh_add_device(sdev);
1310
1311         error = device_add(&sdev->sdev_gendev);
1312         if (error) {
1313                 sdev_printk(KERN_INFO, sdev,
1314                                 "failed to add device: %d\n", error);
1315                 return error;
1316         }
1317
1318         device_enable_async_suspend(&sdev->sdev_dev);
1319         error = device_add(&sdev->sdev_dev);
1320         if (error) {
1321                 sdev_printk(KERN_INFO, sdev,
1322                                 "failed to add class device: %d\n", error);
1323                 device_del(&sdev->sdev_gendev);
1324                 return error;
1325         }
1326         transport_add_device(&sdev->sdev_gendev);
1327         sdev->is_visible = 1;
1328
1329         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1330         if (error)
1331                 /* we're treating error on bsg register as non-fatal,
1332                  * so pretend nothing went wrong */
1333                 sdev_printk(KERN_INFO, sdev,
1334                             "Failed to register bsg queue, errno=%d\n", error);
1335
1336         /* add additional host specific attributes */
1337         if (sdev->host->hostt->sdev_attrs) {
1338                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1339                         error = device_create_file(&sdev->sdev_gendev,
1340                                         sdev->host->hostt->sdev_attrs[i]);
1341                         if (error)
1342                                 return error;
1343                 }
1344         }
1345
1346         if (sdev->host->hostt->sdev_groups) {
1347                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1348                                 sdev->host->hostt->sdev_groups);
1349                 if (error)
1350                         return error;
1351         }
1352
1353         scsi_autopm_put_device(sdev);
1354         return error;
1355 }
1356
1357 void __scsi_remove_device(struct scsi_device *sdev)
1358 {
1359         struct device *dev = &sdev->sdev_gendev;
1360         int res;
1361
1362         /*
1363          * This cleanup path is not reentrant and while it is impossible
1364          * to get a new reference with scsi_device_get() someone can still
1365          * hold a previously acquired one.
1366          */
1367         if (sdev->sdev_state == SDEV_DEL)
1368                 return;
1369
1370         if (sdev->is_visible) {
1371                 /*
1372                  * If scsi_internal_target_block() is running concurrently,
1373                  * wait until it has finished before changing the device state.
1374                  */
1375                 mutex_lock(&sdev->state_mutex);
1376                 /*
1377                  * If blocked, we go straight to DEL and restart the queue so
1378                  * any commands issued during driver shutdown (like sync
1379                  * cache) are errored immediately.
1380                  */
1381                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1382                 if (res != 0) {
1383                         res = scsi_device_set_state(sdev, SDEV_DEL);
1384                         if (res == 0)
1385                                 scsi_start_queue(sdev);
1386                 }
1387                 mutex_unlock(&sdev->state_mutex);
1388
1389                 if (res != 0)
1390                         return;
1391
1392                 if (sdev->host->hostt->sdev_groups)
1393                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1394                                         sdev->host->hostt->sdev_groups);
1395
1396                 bsg_unregister_queue(sdev->request_queue);
1397                 device_unregister(&sdev->sdev_dev);
1398                 transport_remove_device(dev);
1399                 device_del(dev);
1400         } else
1401                 put_device(&sdev->sdev_dev);
1402
1403         /*
1404          * Stop accepting new requests and wait until all queuecommand() and
1405          * scsi_run_queue() invocations have finished before tearing down the
1406          * device.
1407          */
1408         mutex_lock(&sdev->state_mutex);
1409         scsi_device_set_state(sdev, SDEV_DEL);
1410         mutex_unlock(&sdev->state_mutex);
1411
1412         blk_cleanup_queue(sdev->request_queue);
1413         cancel_work_sync(&sdev->requeue_work);
1414
1415         if (sdev->host->hostt->slave_destroy)
1416                 sdev->host->hostt->slave_destroy(sdev);
1417         transport_destroy_device(dev);
1418
1419         /*
1420          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1421          * remoed sysfs visibility from the device, so make the target
1422          * invisible if this was the last device underneath it.
1423          */
1424         scsi_target_reap(scsi_target(sdev));
1425
1426         put_device(dev);
1427 }
1428
1429 /**
1430  * scsi_remove_device - unregister a device from the scsi bus
1431  * @sdev:       scsi_device to unregister
1432  **/
1433 void scsi_remove_device(struct scsi_device *sdev)
1434 {
1435         struct Scsi_Host *shost = sdev->host;
1436
1437         mutex_lock(&shost->scan_mutex);
1438         __scsi_remove_device(sdev);
1439         mutex_unlock(&shost->scan_mutex);
1440 }
1441 EXPORT_SYMBOL(scsi_remove_device);
1442
1443 static void __scsi_remove_target(struct scsi_target *starget)
1444 {
1445         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1446         unsigned long flags;
1447         struct scsi_device *sdev;
1448
1449         spin_lock_irqsave(shost->host_lock, flags);
1450  restart:
1451         list_for_each_entry(sdev, &shost->__devices, siblings) {
1452                 /*
1453                  * We cannot call scsi_device_get() here, as
1454                  * we might've been called from rmmod() causing
1455                  * scsi_device_get() to fail the module_is_live()
1456                  * check.
1457                  */
1458                 if (sdev->channel != starget->channel ||
1459                     sdev->id != starget->id)
1460                         continue;
1461                 if (sdev->sdev_state == SDEV_DEL ||
1462                     sdev->sdev_state == SDEV_CANCEL ||
1463                     !get_device(&sdev->sdev_gendev))
1464                         continue;
1465                 spin_unlock_irqrestore(shost->host_lock, flags);
1466                 scsi_remove_device(sdev);
1467                 put_device(&sdev->sdev_gendev);
1468                 spin_lock_irqsave(shost->host_lock, flags);
1469                 goto restart;
1470         }
1471         spin_unlock_irqrestore(shost->host_lock, flags);
1472 }
1473
1474 /**
1475  * scsi_remove_target - try to remove a target and all its devices
1476  * @dev: generic starget or parent of generic stargets to be removed
1477  *
1478  * Note: This is slightly racy.  It is possible that if the user
1479  * requests the addition of another device then the target won't be
1480  * removed.
1481  */
1482 void scsi_remove_target(struct device *dev)
1483 {
1484         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1485         struct scsi_target *starget;
1486         unsigned long flags;
1487
1488 restart:
1489         spin_lock_irqsave(shost->host_lock, flags);
1490         list_for_each_entry(starget, &shost->__targets, siblings) {
1491                 if (starget->state == STARGET_DEL ||
1492                     starget->state == STARGET_REMOVE ||
1493                     starget->state == STARGET_CREATED_REMOVE)
1494                         continue;
1495                 if (starget->dev.parent == dev || &starget->dev == dev) {
1496                         kref_get(&starget->reap_ref);
1497                         if (starget->state == STARGET_CREATED)
1498                                 starget->state = STARGET_CREATED_REMOVE;
1499                         else
1500                                 starget->state = STARGET_REMOVE;
1501                         spin_unlock_irqrestore(shost->host_lock, flags);
1502                         __scsi_remove_target(starget);
1503                         scsi_target_reap(starget);
1504                         goto restart;
1505                 }
1506         }
1507         spin_unlock_irqrestore(shost->host_lock, flags);
1508 }
1509 EXPORT_SYMBOL(scsi_remove_target);
1510
1511 int scsi_register_driver(struct device_driver *drv)
1512 {
1513         drv->bus = &scsi_bus_type;
1514
1515         return driver_register(drv);
1516 }
1517 EXPORT_SYMBOL(scsi_register_driver);
1518
1519 int scsi_register_interface(struct class_interface *intf)
1520 {
1521         intf->class = &sdev_class;
1522
1523         return class_interface_register(intf);
1524 }
1525 EXPORT_SYMBOL(scsi_register_interface);
1526
1527 /**
1528  * scsi_sysfs_add_host - add scsi host to subsystem
1529  * @shost:     scsi host struct to add to subsystem
1530  **/
1531 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1532 {
1533         int error, i;
1534
1535         /* add host specific attributes */
1536         if (shost->hostt->shost_attrs) {
1537                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1538                         error = device_create_file(&shost->shost_dev,
1539                                         shost->hostt->shost_attrs[i]);
1540                         if (error)
1541                                 return error;
1542                 }
1543         }
1544
1545         transport_register_device(&shost->shost_gendev);
1546         transport_configure_device(&shost->shost_gendev);
1547         return 0;
1548 }
1549
1550 static struct device_type scsi_dev_type = {
1551         .name =         "scsi_device",
1552         .release =      scsi_device_dev_release,
1553         .groups =       scsi_sdev_attr_groups,
1554 };
1555
1556 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1557 {
1558         unsigned long flags;
1559         struct Scsi_Host *shost = sdev->host;
1560         struct scsi_target  *starget = sdev->sdev_target;
1561
1562         device_initialize(&sdev->sdev_gendev);
1563         sdev->sdev_gendev.bus = &scsi_bus_type;
1564         sdev->sdev_gendev.type = &scsi_dev_type;
1565         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1566                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1567
1568         device_initialize(&sdev->sdev_dev);
1569         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1570         sdev->sdev_dev.class = &sdev_class;
1571         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1572                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1573         /*
1574          * Get a default scsi_level from the target (derived from sibling
1575          * devices).  This is the best we can do for guessing how to set
1576          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1577          * setting doesn't matter, because all the bits are zero anyway.
1578          * But it does matter for higher LUNs.
1579          */
1580         sdev->scsi_level = starget->scsi_level;
1581         if (sdev->scsi_level <= SCSI_2 &&
1582                         sdev->scsi_level != SCSI_UNKNOWN &&
1583                         !shost->no_scsi2_lun_in_cdb)
1584                 sdev->lun_in_cdb = 1;
1585
1586         transport_setup_device(&sdev->sdev_gendev);
1587         spin_lock_irqsave(shost->host_lock, flags);
1588         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1589         list_add_tail(&sdev->siblings, &shost->__devices);
1590         spin_unlock_irqrestore(shost->host_lock, flags);
1591         /*
1592          * device can now only be removed via __scsi_remove_device() so hold
1593          * the target.  Target will be held in CREATED state until something
1594          * beneath it becomes visible (in which case it moves to RUNNING)
1595          */
1596         kref_get(&starget->reap_ref);
1597 }
1598
1599 int scsi_is_sdev_device(const struct device *dev)
1600 {
1601         return dev->type == &scsi_dev_type;
1602 }
1603 EXPORT_SYMBOL(scsi_is_sdev_device);
1604
1605 /* A blank transport template that is used in drivers that don't
1606  * yet implement Transport Attributes */
1607 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };