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