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_transport.h>
  21 #include <scsi/scsi_driver.h>
  22
  23 #include "scsi_priv.h"
  24 #include "scsi_logging.h"
  25
  26 static struct device_type scsi_dev_type;
  27
  28 static const struct {
  29         enum scsi_device_state  value;
  30         char                    *name;
  31 } sdev_states[] = {
  32         { SDEV_CREATED, "created" },
  33         { SDEV_RUNNING, "running" },
  34         { SDEV_CANCEL, "cancel" },
  35         { SDEV_DEL, "deleted" },
  36         { SDEV_QUIESCE, "quiesce" },
  37         { SDEV_OFFLINE, "offline" },
  38         { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  39         { SDEV_BLOCK,   "blocked" },
  40         { SDEV_CREATED_BLOCK, "created-blocked" },
  41 };
  42
  43 const char *scsi_device_state_name(enum scsi_device_state state)
  44 {
  45         int i;
  46         char *name = NULL;
  47
  48         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  49                 if (sdev_states[i].value == state) {
  50                         name = sdev_states[i].name;
  51                         break;
  52                 }
  53         }
  54         return name;
  55 }
  56
  57 static const struct {
  58         enum scsi_host_state    value;
  59         char                    *name;
  60 } shost_states[] = {
  61         { SHOST_CREATED, "created" },
  62         { SHOST_RUNNING, "running" },
  63         { SHOST_CANCEL, "cancel" },
  64         { SHOST_DEL, "deleted" },
  65         { SHOST_RECOVERY, "recovery" },
  66         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  67         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  68 };
  69 const char *scsi_host_state_name(enum scsi_host_state state)
  70 {
  71         int i;
  72         char *name = NULL;
  73
  74         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  75                 if (shost_states[i].value == state) {
  76                         name = shost_states[i].name;
  77                         break;
  78                 }
  79         }
  80         return name;
  81 }
  82
  83 static int check_set(unsigned int *val, char *src)
  84 {
  85         char *last;
  86
  87         if (strncmp(src, "-", 20) == 0) {
  88                 *val = SCAN_WILD_CARD;
  89         } else {
  90                 /*
  91                  * Doesn't check for int overflow
  92                  */
  93                 *val = simple_strtoul(src, &last, 0);
  94                 if (*last != '\0')
  95                         return 1;
  96         }
  97         return 0;
  98 }
  99
 100 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 101 {
 102         char s1[15], s2[15], s3[15], junk;
 103         unsigned int channel, id, lun;
 104         int res;
 105
 106         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 107         if (res != 3)
 108                 return -EINVAL;
 109         if (check_set(&channel, s1))
 110                 return -EINVAL;
 111         if (check_set(&id, s2))
 112                 return -EINVAL;
 113         if (check_set(&lun, s3))
 114                 return -EINVAL;
 115         if (shost->transportt->user_scan)
 116                 res = shost->transportt->user_scan(shost, channel, id, lun);
 117         else
 118                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 119         return res;
 120 }
 121
 122 /*
 123  * shost_show_function: macro to create an attr function that can be used to
 124  * show a non-bit field.
 125  */
 126 #define shost_show_function(name, field, format_string)                 \
 127 static ssize_t                                                          \
 128 show_##name (struct device *dev, struct device_attribute *attr,         \
 129              char *buf)                                                 \
 130 {                                                                       \
 131         struct Scsi_Host *shost = class_to_shost(dev);                  \
 132         return snprintf (buf, 20, format_string, shost->field);         \
 133 }
 134
 135 /*
 136  * shost_rd_attr: macro to create a function and attribute variable for a
 137  * read only field.
 138  */
 139 #define shost_rd_attr2(name, field, format_string)                      \
 140         shost_show_function(name, field, format_string)                 \
 141 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 142
 143 #define shost_rd_attr(field, format_string) \
 144 shost_rd_attr2(field, field, format_string)
 145
 146 /*
 147  * Create the actual show/store functions and data structures.
 148  */
 149
 150 static ssize_t
 151 store_scan(struct device *dev, struct device_attribute *attr,
 152            const char *buf, size_t count)
 153 {
 154         struct Scsi_Host *shost = class_to_shost(dev);
 155         int res;
 156
 157         res = scsi_scan(shost, buf);
 158         if (res == 0)
 159                 res = count;
 160         return res;
 161 };
 162 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 163
 164 static ssize_t
 165 store_shost_state(struct device *dev, struct device_attribute *attr,
 166                   const char *buf, size_t count)
 167 {
 168         int i;
 169         struct Scsi_Host *shost = class_to_shost(dev);
 170         enum scsi_host_state state = 0;
 171
 172         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 173                 const int len = strlen(shost_states[i].name);
 174                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 175                    buf[len] == '\n') {
 176                         state = shost_states[i].value;
 177                         break;
 178                 }
 179         }
 180         if (!state)
 181                 return -EINVAL;
 182
 183         if (scsi_host_set_state(shost, state))
 184                 return -EINVAL;
 185         return count;
 186 }
 187
 188 static ssize_t
 189 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 190 {
 191         struct Scsi_Host *shost = class_to_shost(dev);
 192         const char *name = scsi_host_state_name(shost->shost_state);
 193
 194         if (!name)
 195                 return -EINVAL;
 196
 197         return snprintf(buf, 20, "%s\n", name);
 198 }
 199
 200 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 201 struct device_attribute dev_attr_hstate =
 202         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 203
 204 static ssize_t
 205 show_shost_mode(unsigned int mode, char *buf)
 206 {
 207         ssize_t len = 0;
 208
 209         if (mode & MODE_INITIATOR)
 210                 len = sprintf(buf, "%s", "Initiator");
 211
 212         if (mode & MODE_TARGET)
 213                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 214
 215         len += sprintf(buf + len, "\n");
 216
 217         return len;
 218 }
 219
 220 static ssize_t
 221 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 222                           char *buf)
 223 {
 224         struct Scsi_Host *shost = class_to_shost(dev);
 225         unsigned int supported_mode = shost->hostt->supported_mode;
 226
 227         if (supported_mode == MODE_UNKNOWN)
 228                 /* by default this should be initiator */
 229                 supported_mode = MODE_INITIATOR;
 230
 231         return show_shost_mode(supported_mode, buf);
 232 }
 233
 234 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 235
 236 static ssize_t
 237 show_shost_active_mode(struct device *dev,
 238                        struct device_attribute *attr, char *buf)
 239 {
 240         struct Scsi_Host *shost = class_to_shost(dev);
 241
 242         if (shost->active_mode == MODE_UNKNOWN)
 243                 return snprintf(buf, 20, "unknown\n");
 244         else
 245                 return show_shost_mode(shost->active_mode, buf);
 246 }
 247
 248 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 249
 250 static int check_reset_type(const char *str)
 251 {
 252         if (sysfs_streq(str, "adapter"))
 253                 return SCSI_ADAPTER_RESET;
 254         else if (sysfs_streq(str, "firmware"))
 255                 return SCSI_FIRMWARE_RESET;
 256         else
 257                 return 0;
 258 }
 259
 260 static ssize_t
 261 store_host_reset(struct device *dev, struct device_attribute *attr,
 262                 const char *buf, size_t count)
 263 {
 264         struct Scsi_Host *shost = class_to_shost(dev);
 265         struct scsi_host_template *sht = shost->hostt;
 266         int ret = -EINVAL;
 267         int type;
 268
 269         type = check_reset_type(buf);
 270         if (!type)
 271                 goto exit_store_host_reset;
 272
 273         if (sht->host_reset)
 274                 ret = sht->host_reset(shost, type);
 275
 276 exit_store_host_reset:
 277         if (ret == 0)
 278                 ret = count;
 279         return ret;
 280 }
 281
 282 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 283
 284 static ssize_t
 285 show_shost_eh_deadline(struct device *dev,
 286                       struct device_attribute *attr, char *buf)
 287 {
 288         struct Scsi_Host *shost = class_to_shost(dev);
 289
 290         if (shost->eh_deadline == -1)
 291                 return snprintf(buf, strlen("off") + 2, "off\n");
 292         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 293 }
 294
 295 static ssize_t
 296 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 297                 const char *buf, size_t count)
 298 {
 299         struct Scsi_Host *shost = class_to_shost(dev);
 300         int ret = -EINVAL;
 301         unsigned long deadline, flags;
 302
 303         if (shost->transportt && shost->transportt->eh_strategy_handler)
 304                 return ret;
 305
 306         if (!strncmp(buf, "off", strlen("off")))
 307                 deadline = -1;
 308         else {
 309                 ret = kstrtoul(buf, 10, &deadline);
 310                 if (ret)
 311                         return ret;
 312                 if (deadline * HZ > UINT_MAX)
 313                         return -EINVAL;
 314         }
 315
 316         spin_lock_irqsave(shost->host_lock, flags);
 317         if (scsi_host_in_recovery(shost))
 318                 ret = -EBUSY;
 319         else {
 320                 if (deadline == -1)
 321                         shost->eh_deadline = -1;
 322                 else
 323                         shost->eh_deadline = deadline * HZ;
 324
 325                 ret = count;
 326         }
 327         spin_unlock_irqrestore(shost->host_lock, flags);
 328
 329         return ret;
 330 }
 331
 332 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 333
 334 shost_rd_attr(unique_id, "%u\n");
 335 shost_rd_attr(host_busy, "%hu\n");
 336 shost_rd_attr(cmd_per_lun, "%hd\n");
 337 shost_rd_attr(can_queue, "%hd\n");
 338 shost_rd_attr(sg_tablesize, "%hu\n");
 339 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 340 shost_rd_attr(unchecked_isa_dma, "%d\n");
 341 shost_rd_attr(prot_capabilities, "%u\n");
 342 shost_rd_attr(prot_guard_type, "%hd\n");
 343 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 344
 345 static struct attribute *scsi_sysfs_shost_attrs[] = {
 346         &dev_attr_unique_id.attr,
 347         &dev_attr_host_busy.attr,
 348         &dev_attr_cmd_per_lun.attr,
 349         &dev_attr_can_queue.attr,
 350         &dev_attr_sg_tablesize.attr,
 351         &dev_attr_sg_prot_tablesize.attr,
 352         &dev_attr_unchecked_isa_dma.attr,
 353         &dev_attr_proc_name.attr,
 354         &dev_attr_scan.attr,
 355         &dev_attr_hstate.attr,
 356         &dev_attr_supported_mode.attr,
 357         &dev_attr_active_mode.attr,
 358         &dev_attr_prot_capabilities.attr,
 359         &dev_attr_prot_guard_type.attr,
 360         &dev_attr_host_reset.attr,
 361         &dev_attr_eh_deadline.attr,
 362         NULL
 363 };
 364
 365 struct attribute_group scsi_shost_attr_group = {
 366         .attrs =        scsi_sysfs_shost_attrs,
 367 };
 368
 369 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 370         &scsi_shost_attr_group,
 371         NULL
 372 };
 373
 374 static void scsi_device_cls_release(struct device *class_dev)
 375 {
 376         struct scsi_device *sdev;
 377
 378         sdev = class_to_sdev(class_dev);
 379         put_device(&sdev->sdev_gendev);
 380 }
 381
 382 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 383 {
 384         struct scsi_device *sdev;
 385         struct device *parent;
 386         struct scsi_target *starget;
 387         struct list_head *this, *tmp;
 388         unsigned long flags;
 389
 390         sdev = container_of(work, struct scsi_device, ew.work);
 391
 392         parent = sdev->sdev_gendev.parent;
 393         starget = to_scsi_target(parent);
 394
 395         spin_lock_irqsave(sdev->host->host_lock, flags);
 396         starget->reap_ref++;
 397         list_del(&sdev->siblings);
 398         list_del(&sdev->same_target_siblings);
 399         list_del(&sdev->starved_entry);
 400         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 401
 402         cancel_work_sync(&sdev->event_work);
 403
 404         list_for_each_safe(this, tmp, &sdev->event_list) {
 405                 struct scsi_event *evt;
 406
 407                 evt = list_entry(this, struct scsi_event, node);
 408                 list_del(&evt->node);
 409                 kfree(evt);
 410         }
 411
 412         blk_put_queue(sdev->request_queue);
 413         /* NULL queue means the device can't be used */
 414         sdev->request_queue = NULL;
 415
 416         scsi_target_reap(scsi_target(sdev));
 417
 418         kfree(sdev->inquiry);
 419         kfree(sdev);
 420
 421         if (parent)
 422                 put_device(parent);
 423 }
 424
 425 static void scsi_device_dev_release(struct device *dev)
 426 {
 427         struct scsi_device *sdp = to_scsi_device(dev);
 428         execute_in_process_context(scsi_device_dev_release_usercontext,
 429                                    &sdp->ew);
 430 }
 431
 432 static struct class sdev_class = {
 433         .name           = "scsi_device",
 434         .dev_release    = scsi_device_cls_release,
 435 };
 436
 437 /* all probing is done in the individual ->probe routines */
 438 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 439 {
 440         struct scsi_device *sdp;
 441
 442         if (dev->type != &scsi_dev_type)
 443                 return 0;
 444
 445         sdp = to_scsi_device(dev);
 446         if (sdp->no_uld_attach)
 447                 return 0;
 448         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 449 }
 450
 451 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 452 {
 453         struct scsi_device *sdev;
 454
 455         if (dev->type != &scsi_dev_type)
 456                 return 0;
 457
 458         sdev = to_scsi_device(dev);
 459
 460         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 461         return 0;
 462 }
 463
 464 struct bus_type scsi_bus_type = {
 465         .name           = "scsi",
 466         .match          = scsi_bus_match,
 467         .uevent         = scsi_bus_uevent,
 468 #ifdef CONFIG_PM
 469         .pm             = &scsi_bus_pm_ops,
 470 #endif
 471 };
 472 EXPORT_SYMBOL_GPL(scsi_bus_type);
 473
 474 int scsi_sysfs_register(void)
 475 {
 476         int error;
 477
 478         error = bus_register(&scsi_bus_type);
 479         if (!error) {
 480                 error = class_register(&sdev_class);
 481                 if (error)
 482                         bus_unregister(&scsi_bus_type);
 483         }
 484
 485         return error;
 486 }
 487
 488 void scsi_sysfs_unregister(void)
 489 {
 490         class_unregister(&sdev_class);
 491         bus_unregister(&scsi_bus_type);
 492 }
 493
 494 /*
 495  * sdev_show_function: macro to create an attr function that can be used to
 496  * show a non-bit field.
 497  */
 498 #define sdev_show_function(field, format_string)                                \
 499 static ssize_t                                                          \
 500 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 501                    char *buf)                                           \
 502 {                                                                       \
 503         struct scsi_device *sdev;                                       \
 504         sdev = to_scsi_device(dev);                                     \
 505         return snprintf (buf, 20, format_string, sdev->field);          \
 506 }                                                                       \
 507
 508 /*
 509  * sdev_rd_attr: macro to create a function and attribute variable for a
 510  * read only field.
 511  */
 512 #define sdev_rd_attr(field, format_string)                              \
 513         sdev_show_function(field, format_string)                        \
 514 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 515
 516
 517 /*
 518  * sdev_rw_attr: create a function and attribute variable for a
 519  * read/write field.
 520  */
 521 #define sdev_rw_attr(field, format_string)                              \
 522         sdev_show_function(field, format_string)                                \
 523                                                                         \
 524 static ssize_t                                                          \
 525 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 526                     const char *buf, size_t count)                      \
 527 {                                                                       \
 528         struct scsi_device *sdev;                                       \
 529         sdev = to_scsi_device(dev);                                     \
 530         sscanf (buf, format_string, &sdev->field);                      \
 531         return count;                                                   \
 532 }                                                                       \
 533 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 534
 535 /* Currently we don't export bit fields, but we might in future,
 536  * so leave this code in */
 537 #if 0
 538 /*
 539  * sdev_rd_attr: create a function and attribute variable for a
 540  * read/write bit field.
 541  */
 542 #define sdev_rw_attr_bit(field)                                         \
 543         sdev_show_function(field, "%d\n")                                       \
 544                                                                         \
 545 static ssize_t                                                          \
 546 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 547                     const char *buf, size_t count)                      \
 548 {                                                                       \
 549         int ret;                                                        \
 550         struct scsi_device *sdev;                                       \
 551         ret = scsi_sdev_check_buf_bit(buf);                             \
 552         if (ret >= 0)   {                                               \
 553                 sdev = to_scsi_device(dev);                             \
 554                 sdev->field = ret;                                      \
 555                 ret = count;                                            \
 556         }                                                               \
 557         return ret;                                                     \
 558 }                                                                       \
 559 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 560
 561 /*
 562  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 563  * else return -EINVAL.
 564  */
 565 static int scsi_sdev_check_buf_bit(const char *buf)
 566 {
 567         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 568                 if (buf[0] == '1')
 569                         return 1;
 570                 else if (buf[0] == '0')
 571                         return 0;
 572                 else
 573                         return -EINVAL;
 574         } else
 575                 return -EINVAL;
 576 }
 577 #endif
 578 /*
 579  * Create the actual show/store functions and data structures.
 580  */
 581 sdev_rd_attr (device_blocked, "%d\n");
 582 sdev_rd_attr (queue_depth, "%d\n");
 583 sdev_rd_attr (device_busy, "%d\n");
 584 sdev_rd_attr (type, "%d\n");
 585 sdev_rd_attr (scsi_level, "%d\n");
 586 sdev_rd_attr (vendor, "%.8s\n");
 587 sdev_rd_attr (model, "%.16s\n");
 588 sdev_rd_attr (rev, "%.4s\n");
 589
 590 /*
 591  * TODO: can we make these symlinks to the block layer ones?
 592  */
 593 static ssize_t
 594 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 595 {
 596         struct scsi_device *sdev;
 597         sdev = to_scsi_device(dev);
 598         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 599 }
 600
 601 static ssize_t
 602 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 603                     const char *buf, size_t count)
 604 {
 605         struct scsi_device *sdev;
 606         int timeout;
 607         sdev = to_scsi_device(dev);
 608         sscanf (buf, "%d\n", &timeout);
 609         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 610         return count;
 611 }
 612 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 613
 614 static ssize_t
 615 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 616 {
 617         struct scsi_device *sdev;
 618         sdev = to_scsi_device(dev);
 619         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 620 }
 621
 622 static ssize_t
 623 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 624                     const char *buf, size_t count)
 625 {
 626         struct scsi_device *sdev;
 627         unsigned int eh_timeout;
 628         int err;
 629
 630         if (!capable(CAP_SYS_ADMIN))
 631                 return -EACCES;
 632
 633         sdev = to_scsi_device(dev);
 634         err = kstrtouint(buf, 10, &eh_timeout);
 635         if (err)
 636                 return err;
 637         sdev->eh_timeout = eh_timeout * HZ;
 638
 639         return count;
 640 }
 641 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 642
 643 static ssize_t
 644 store_rescan_field (struct device *dev, struct device_attribute *attr,
 645                     const char *buf, size_t count)
 646 {
 647         scsi_rescan_device(dev);
 648         return count;
 649 }
 650 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 651
 652 static void sdev_store_delete_callback(struct device *dev)
 653 {
 654         scsi_remove_device(to_scsi_device(dev));
 655 }
 656
 657 static ssize_t
 658 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 659                   const char *buf, size_t count)
 660 {
 661         int rc;
 662
 663         /* An attribute cannot be unregistered by one of its own methods,
 664          * so we have to use this roundabout approach.
 665          */
 666         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 667         if (rc)
 668                 count = rc;
 669         return count;
 670 };
 671 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 672
 673 static ssize_t
 674 store_state_field(struct device *dev, struct device_attribute *attr,
 675                   const char *buf, size_t count)
 676 {
 677         int i;
 678         struct scsi_device *sdev = to_scsi_device(dev);
 679         enum scsi_device_state state = 0;
 680
 681         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 682                 const int len = strlen(sdev_states[i].name);
 683                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 684                    buf[len] == '\n') {
 685                         state = sdev_states[i].value;
 686                         break;
 687                 }
 688         }
 689         if (!state)
 690                 return -EINVAL;
 691
 692         if (scsi_device_set_state(sdev, state))
 693                 return -EINVAL;
 694         return count;
 695 }
 696
 697 static ssize_t
 698 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 699 {
 700         struct scsi_device *sdev = to_scsi_device(dev);
 701         const char *name = scsi_device_state_name(sdev->sdev_state);
 702
 703         if (!name)
 704                 return -EINVAL;
 705
 706         return snprintf(buf, 20, "%s\n", name);
 707 }
 708
 709 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 710
 711 static ssize_t
 712 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 713                       char *buf)
 714 {
 715         struct scsi_device *sdev = to_scsi_device(dev);
 716         const char *name = "none";
 717
 718         if (sdev->ordered_tags)
 719                 name = "ordered";
 720         else if (sdev->simple_tags)
 721                 name = "simple";
 722
 723         return snprintf(buf, 20, "%s\n", name);
 724 }
 725
 726 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 727
 728 static ssize_t
 729 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 730 {
 731         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 732 }
 733
 734 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 735
 736 #define show_sdev_iostat(field)                                         \
 737 static ssize_t                                                          \
 738 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 739                     char *buf)                                          \
 740 {                                                                       \
 741         struct scsi_device *sdev = to_scsi_device(dev);                 \
 742         unsigned long long count = atomic_read(&sdev->field);           \
 743         return snprintf(buf, 20, "0x%llx\n", count);                    \
 744 }                                                                       \
 745 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 746
 747 show_sdev_iostat(iorequest_cnt);
 748 show_sdev_iostat(iodone_cnt);
 749 show_sdev_iostat(ioerr_cnt);
 750
 751 static ssize_t
 752 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 753 {
 754         struct scsi_device *sdev;
 755         sdev = to_scsi_device(dev);
 756         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 757 }
 758 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 759
 760 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 761 static ssize_t                                                          \
 762 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 763                      char *buf)                                         \
 764 {                                                                       \
 765         struct scsi_device *sdev = to_scsi_device(dev);                 \
 766         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 767         return snprintf(buf, 20, "%d\n", val);                          \
 768 }
 769
 770 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 771 static ssize_t                                                          \
 772 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 773                       const char *buf, size_t count)                    \
 774 {                                                                       \
 775         struct scsi_device *sdev = to_scsi_device(dev);                 \
 776         int val = simple_strtoul(buf, NULL, 0);                         \
 777         if (val == 0)                                                   \
 778                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 779         else if (val == 1)                                              \
 780                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 781         else                                                            \
 782                 return -EINVAL;                                         \
 783         return count;                                                   \
 784 }
 785
 786 #define DECLARE_EVT(name, Cap_name)                                     \
 787         DECLARE_EVT_SHOW(name, Cap_name)                                \
 788         DECLARE_EVT_STORE(name, Cap_name)                               \
 789         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 790                            sdev_store_evt_##name);
 791 #define REF_EVT(name) &dev_attr_evt_##name.attr
 792
 793 DECLARE_EVT(media_change, MEDIA_CHANGE)
 794 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 795 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 796 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 797 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 798 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 799
 800 /* Default template for device attributes.  May NOT be modified */
 801 static struct attribute *scsi_sdev_attrs[] = {
 802         &dev_attr_device_blocked.attr,
 803         &dev_attr_type.attr,
 804         &dev_attr_scsi_level.attr,
 805         &dev_attr_device_busy.attr,
 806         &dev_attr_vendor.attr,
 807         &dev_attr_model.attr,
 808         &dev_attr_rev.attr,
 809         &dev_attr_rescan.attr,
 810         &dev_attr_delete.attr,
 811         &dev_attr_state.attr,
 812         &dev_attr_timeout.attr,
 813         &dev_attr_eh_timeout.attr,
 814         &dev_attr_iocounterbits.attr,
 815         &dev_attr_iorequest_cnt.attr,
 816         &dev_attr_iodone_cnt.attr,
 817         &dev_attr_ioerr_cnt.attr,
 818         &dev_attr_modalias.attr,
 819         REF_EVT(media_change),
 820         REF_EVT(inquiry_change_reported),
 821         REF_EVT(capacity_change_reported),
 822         REF_EVT(soft_threshold_reached),
 823         REF_EVT(mode_parameter_change_reported),
 824         REF_EVT(lun_change_reported),
 825         NULL
 826 };
 827
 828 static struct attribute_group scsi_sdev_attr_group = {
 829         .attrs =        scsi_sdev_attrs,
 830 };
 831
 832 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 833         &scsi_sdev_attr_group,
 834         NULL
 835 };
 836
 837 static ssize_t
 838 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 839                           const char *buf, size_t count)
 840 {
 841         int depth, retval;
 842         struct scsi_device *sdev = to_scsi_device(dev);
 843         struct scsi_host_template *sht = sdev->host->hostt;
 844
 845         if (!sht->change_queue_depth)
 846                 return -EINVAL;
 847
 848         depth = simple_strtoul(buf, NULL, 0);
 849
 850         if (depth < 1)
 851                 return -EINVAL;
 852
 853         retval = sht->change_queue_depth(sdev, depth,
 854                                          SCSI_QDEPTH_DEFAULT);
 855         if (retval < 0)
 856                 return retval;
 857
 858         sdev->max_queue_depth = sdev->queue_depth;
 859
 860         return count;
 861 }
 862
 863 static struct device_attribute sdev_attr_queue_depth_rw =
 864         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 865                sdev_store_queue_depth_rw);
 866
 867 static ssize_t
 868 sdev_show_queue_ramp_up_period(struct device *dev,
 869                                struct device_attribute *attr,
 870                                char *buf)
 871 {
 872         struct scsi_device *sdev;
 873         sdev = to_scsi_device(dev);
 874         return snprintf(buf, 20, "%u\n",
 875                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 876 }
 877
 878 static ssize_t
 879 sdev_store_queue_ramp_up_period(struct device *dev,
 880                                 struct device_attribute *attr,
 881                                 const char *buf, size_t count)
 882 {
 883         struct scsi_device *sdev = to_scsi_device(dev);
 884         unsigned long period;
 885
 886         if (strict_strtoul(buf, 10, &period))
 887                 return -EINVAL;
 888
 889         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 890         return period;
 891 }
 892
 893 static struct device_attribute sdev_attr_queue_ramp_up_period =
 894         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 895                sdev_show_queue_ramp_up_period,
 896                sdev_store_queue_ramp_up_period);
 897
 898 static ssize_t
 899 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 900                          const char *buf, size_t count)
 901 {
 902         struct scsi_device *sdev = to_scsi_device(dev);
 903         struct scsi_host_template *sht = sdev->host->hostt;
 904         int tag_type = 0, retval;
 905         int prev_tag_type = scsi_get_tag_type(sdev);
 906
 907         if (!sdev->tagged_supported || !sht->change_queue_type)
 908                 return -EINVAL;
 909
 910         if (strncmp(buf, "ordered", 7) == 0)
 911                 tag_type = MSG_ORDERED_TAG;
 912         else if (strncmp(buf, "simple", 6) == 0)
 913                 tag_type = MSG_SIMPLE_TAG;
 914         else if (strncmp(buf, "none", 4) != 0)
 915                 return -EINVAL;
 916
 917         if (tag_type == prev_tag_type)
 918                 return count;
 919
 920         retval = sht->change_queue_type(sdev, tag_type);
 921         if (retval < 0)
 922                 return retval;
 923
 924         return count;
 925 }
 926
 927 static int scsi_target_add(struct scsi_target *starget)
 928 {
 929         int error;
 930
 931         if (starget->state != STARGET_CREATED)
 932                 return 0;
 933
 934         error = device_add(&starget->dev);
 935         if (error) {
 936                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 937                 return error;
 938         }
 939         transport_add_device(&starget->dev);
 940         starget->state = STARGET_RUNNING;
 941
 942         pm_runtime_set_active(&starget->dev);
 943         pm_runtime_enable(&starget->dev);
 944         device_enable_async_suspend(&starget->dev);
 945
 946         return 0;
 947 }
 948
 949 static struct device_attribute sdev_attr_queue_type_rw =
 950         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 951                sdev_store_queue_type_rw);
 952
 953 /**
 954  * scsi_sysfs_add_sdev - add scsi device to sysfs
 955  * @sdev:       scsi_device to add
 956  *
 957  * Return value:
 958  *      0 on Success / non-zero on Failure
 959  **/
 960 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 961 {
 962         int error, i;
 963         struct request_queue *rq = sdev->request_queue;
 964         struct scsi_target *starget = sdev->sdev_target;
 965
 966         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 967         if (error)
 968                 return error;
 969
 970         error = scsi_target_add(starget);
 971         if (error)
 972                 return error;
 973
 974         transport_configure_device(&starget->dev);
 975
 976         device_enable_async_suspend(&sdev->sdev_gendev);
 977         scsi_autopm_get_target(starget);
 978         pm_runtime_set_active(&sdev->sdev_gendev);
 979         pm_runtime_forbid(&sdev->sdev_gendev);
 980         pm_runtime_enable(&sdev->sdev_gendev);
 981         scsi_autopm_put_target(starget);
 982
 983         /* The following call will keep sdev active indefinitely, until
 984          * its driver does a corresponding scsi_autopm_pm_device().  Only
 985          * drivers supporting autosuspend will do this.
 986          */
 987         scsi_autopm_get_device(sdev);
 988
 989         error = device_add(&sdev->sdev_gendev);
 990         if (error) {
 991                 sdev_printk(KERN_INFO, sdev,
 992                                 "failed to add device: %d\n", error);
 993                 return error;
 994         }
 995         device_enable_async_suspend(&sdev->sdev_dev);
 996         error = device_add(&sdev->sdev_dev);
 997         if (error) {
 998                 sdev_printk(KERN_INFO, sdev,
 999                                 "failed to add class device: %d\n", error);
1000                 device_del(&sdev->sdev_gendev);
1001                 return error;
1002         }
1003         transport_add_device(&sdev->sdev_gendev);
1004         sdev->is_visible = 1;
1005
1006         /* create queue files, which may be writable, depending on the host */
1007         if (sdev->host->hostt->change_queue_depth) {
1008                 error = device_create_file(&sdev->sdev_gendev,
1009                                            &sdev_attr_queue_depth_rw);
1010                 error = device_create_file(&sdev->sdev_gendev,
1011                                            &sdev_attr_queue_ramp_up_period);
1012         }
1013         else
1014                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
1015         if (error)
1016                 return error;
1017
1018         if (sdev->host->hostt->change_queue_type)
1019                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
1020         else
1021                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
1022         if (error)
1023                 return error;
1024
1025         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1026
1027         if (error)
1028                 /* we're treating error on bsg register as non-fatal,
1029                  * so pretend nothing went wrong */
1030                 sdev_printk(KERN_INFO, sdev,
1031                             "Failed to register bsg queue, errno=%d\n", error);
1032
1033         /* add additional host specific attributes */
1034         if (sdev->host->hostt->sdev_attrs) {
1035                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1036                         error = device_create_file(&sdev->sdev_gendev,
1037                                         sdev->host->hostt->sdev_attrs[i]);
1038                         if (error)
1039                                 return error;
1040                 }
1041         }
1042
1043         return error;
1044 }
1045
1046 void __scsi_remove_device(struct scsi_device *sdev)
1047 {
1048         struct device *dev = &sdev->sdev_gendev;
1049
1050         if (sdev->is_visible) {
1051                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
1052                         return;
1053
1054                 bsg_unregister_queue(sdev->request_queue);
1055                 device_unregister(&sdev->sdev_dev);
1056                 transport_remove_device(dev);
1057                 device_del(dev);
1058         } else
1059                 put_device(&sdev->sdev_dev);
1060
1061         /*
1062          * Stop accepting new requests and wait until all queuecommand() and
1063          * scsi_run_queue() invocations have finished before tearing down the
1064          * device.
1065          */
1066         scsi_device_set_state(sdev, SDEV_DEL);
1067         blk_cleanup_queue(sdev->request_queue);
1068         cancel_work_sync(&sdev->requeue_work);
1069
1070         if (sdev->host->hostt->slave_destroy)
1071                 sdev->host->hostt->slave_destroy(sdev);
1072         transport_destroy_device(dev);
1073
1074         put_device(dev);
1075 }
1076
1077 /**
1078  * scsi_remove_device - unregister a device from the scsi bus
1079  * @sdev:       scsi_device to unregister
1080  **/
1081 void scsi_remove_device(struct scsi_device *sdev)
1082 {
1083         struct Scsi_Host *shost = sdev->host;
1084
1085         mutex_lock(&shost->scan_mutex);
1086         __scsi_remove_device(sdev);
1087         mutex_unlock(&shost->scan_mutex);
1088 }
1089 EXPORT_SYMBOL(scsi_remove_device);
1090
1091 static void __scsi_remove_target(struct scsi_target *starget)
1092 {
1093         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1094         unsigned long flags;
1095         struct scsi_device *sdev;
1096
1097         spin_lock_irqsave(shost->host_lock, flags);
1098  restart:
1099         list_for_each_entry(sdev, &shost->__devices, siblings) {
1100                 if (sdev->channel != starget->channel ||
1101                     sdev->id != starget->id ||
1102                     scsi_device_get(sdev))
1103                         continue;
1104                 spin_unlock_irqrestore(shost->host_lock, flags);
1105                 scsi_remove_device(sdev);
1106                 scsi_device_put(sdev);
1107                 spin_lock_irqsave(shost->host_lock, flags);
1108                 goto restart;
1109         }
1110         spin_unlock_irqrestore(shost->host_lock, flags);
1111 }
1112
1113 /**
1114  * scsi_remove_target - try to remove a target and all its devices
1115  * @dev: generic starget or parent of generic stargets to be removed
1116  *
1117  * Note: This is slightly racy.  It is possible that if the user
1118  * requests the addition of another device then the target won't be
1119  * removed.
1120  */
1121 void scsi_remove_target(struct device *dev)
1122 {
1123         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1124         struct scsi_target *starget, *last = NULL;
1125         unsigned long flags;
1126
1127         /* remove targets being careful to lookup next entry before
1128          * deleting the last
1129          */
1130         spin_lock_irqsave(shost->host_lock, flags);
1131         list_for_each_entry(starget, &shost->__targets, siblings) {
1132                 if (starget->state == STARGET_DEL)
1133                         continue;
1134                 if (starget->dev.parent == dev || &starget->dev == dev) {
1135                         /* assuming new targets arrive at the end */
1136                         starget->reap_ref++;
1137                         spin_unlock_irqrestore(shost->host_lock, flags);
1138                         if (last)
1139                                 scsi_target_reap(last);
1140                         last = starget;
1141                         __scsi_remove_target(starget);
1142                         spin_lock_irqsave(shost->host_lock, flags);
1143                 }
1144         }
1145         spin_unlock_irqrestore(shost->host_lock, flags);
1146
1147         if (last)
1148                 scsi_target_reap(last);
1149 }
1150 EXPORT_SYMBOL(scsi_remove_target);
1151
1152 int scsi_register_driver(struct device_driver *drv)
1153 {
1154         drv->bus = &scsi_bus_type;
1155
1156         return driver_register(drv);
1157 }
1158 EXPORT_SYMBOL(scsi_register_driver);
1159
1160 int scsi_register_interface(struct class_interface *intf)
1161 {
1162         intf->class = &sdev_class;
1163
1164         return class_interface_register(intf);
1165 }
1166 EXPORT_SYMBOL(scsi_register_interface);
1167
1168 /**
1169  * scsi_sysfs_add_host - add scsi host to subsystem
1170  * @shost:     scsi host struct to add to subsystem
1171  **/
1172 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1173 {
1174         int error, i;
1175
1176         /* add host specific attributes */
1177         if (shost->hostt->shost_attrs) {
1178                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1179                         error = device_create_file(&shost->shost_dev,
1180                                         shost->hostt->shost_attrs[i]);
1181                         if (error)
1182                                 return error;
1183                 }
1184         }
1185
1186         transport_register_device(&shost->shost_gendev);
1187         transport_configure_device(&shost->shost_gendev);
1188         return 0;
1189 }
1190
1191 static struct device_type scsi_dev_type = {
1192         .name =         "scsi_device",
1193         .release =      scsi_device_dev_release,
1194         .groups =       scsi_sdev_attr_groups,
1195 };
1196
1197 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1198 {
1199         unsigned long flags;
1200         struct Scsi_Host *shost = sdev->host;
1201         struct scsi_target  *starget = sdev->sdev_target;
1202
1203         device_initialize(&sdev->sdev_gendev);
1204         sdev->sdev_gendev.bus = &scsi_bus_type;
1205         sdev->sdev_gendev.type = &scsi_dev_type;
1206         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1207                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1208
1209         device_initialize(&sdev->sdev_dev);
1210         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1211         sdev->sdev_dev.class = &sdev_class;
1212         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1213                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1214         sdev->scsi_level = starget->scsi_level;
1215         transport_setup_device(&sdev->sdev_gendev);
1216         spin_lock_irqsave(shost->host_lock, flags);
1217         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1218         list_add_tail(&sdev->siblings, &shost->__devices);
1219         spin_unlock_irqrestore(shost->host_lock, flags);
1220 }
1221
1222 int scsi_is_sdev_device(const struct device *dev)
1223 {
1224         return dev->type == &scsi_dev_type;
1225 }
1226 EXPORT_SYMBOL(scsi_is_sdev_device);
1227
1228 /* A blank transport template that is used in drivers that don't
1229  * yet implement Transport Attributes */
1230 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };