drivers/scsi/scsi_sysfs.c

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