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         return sprintf(buf, "%d\n", shost->eh_deadline / HZ);
 291 }
 292
 293 static ssize_t
 294 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 295                 const char *buf, size_t count)
 296 {
 297         struct Scsi_Host *shost = class_to_shost(dev);
 298         int ret = -EINVAL;
 299         int deadline;
 300         unsigned long flags;
 301
 302         if (shost->transportt && shost->transportt->eh_strategy_handler)
 303                 return ret;
 304
 305         if (sscanf(buf, "%d\n", &deadline) == 1) {
 306                 spin_lock_irqsave(shost->host_lock, flags);
 307                 if (scsi_host_in_recovery(shost))
 308                         ret = -EBUSY;
 309                 else {
 310                         shost->eh_deadline = deadline * HZ;
 311                         ret = count;
 312                 }
 313                 spin_unlock_irqrestore(shost->host_lock, flags);
 314         }
 315         return ret;
 316 }
 317
 318 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 319
 320 shost_rd_attr(unique_id, "%u\n");
 321 shost_rd_attr(host_busy, "%hu\n");
 322 shost_rd_attr(cmd_per_lun, "%hd\n");
 323 shost_rd_attr(can_queue, "%hd\n");
 324 shost_rd_attr(sg_tablesize, "%hu\n");
 325 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 326 shost_rd_attr(unchecked_isa_dma, "%d\n");
 327 shost_rd_attr(prot_capabilities, "%u\n");
 328 shost_rd_attr(prot_guard_type, "%hd\n");
 329 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 330
 331 static struct attribute *scsi_sysfs_shost_attrs[] = {
 332         &dev_attr_unique_id.attr,
 333         &dev_attr_host_busy.attr,
 334         &dev_attr_cmd_per_lun.attr,
 335         &dev_attr_can_queue.attr,
 336         &dev_attr_sg_tablesize.attr,
 337         &dev_attr_sg_prot_tablesize.attr,
 338         &dev_attr_unchecked_isa_dma.attr,
 339         &dev_attr_proc_name.attr,
 340         &dev_attr_scan.attr,
 341         &dev_attr_hstate.attr,
 342         &dev_attr_supported_mode.attr,
 343         &dev_attr_active_mode.attr,
 344         &dev_attr_prot_capabilities.attr,
 345         &dev_attr_prot_guard_type.attr,
 346         &dev_attr_host_reset.attr,
 347         &dev_attr_eh_deadline.attr,
 348         NULL
 349 };
 350
 351 struct attribute_group scsi_shost_attr_group = {
 352         .attrs =        scsi_sysfs_shost_attrs,
 353 };
 354
 355 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 356         &scsi_shost_attr_group,
 357         NULL
 358 };
 359
 360 static void scsi_device_cls_release(struct device *class_dev)
 361 {
 362         struct scsi_device *sdev;
 363
 364         sdev = class_to_sdev(class_dev);
 365         put_device(&sdev->sdev_gendev);
 366 }
 367
 368 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 369 {
 370         struct scsi_device *sdev;
 371         struct device *parent;
 372         struct scsi_target *starget;
 373         struct list_head *this, *tmp;
 374         unsigned long flags;
 375
 376         sdev = container_of(work, struct scsi_device, ew.work);
 377
 378         parent = sdev->sdev_gendev.parent;
 379         starget = to_scsi_target(parent);
 380
 381         spin_lock_irqsave(sdev->host->host_lock, flags);
 382         starget->reap_ref++;
 383         list_del(&sdev->siblings);
 384         list_del(&sdev->same_target_siblings);
 385         list_del(&sdev->starved_entry);
 386         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 387
 388         cancel_work_sync(&sdev->event_work);
 389
 390         list_for_each_safe(this, tmp, &sdev->event_list) {
 391                 struct scsi_event *evt;
 392
 393                 evt = list_entry(this, struct scsi_event, node);
 394                 list_del(&evt->node);
 395                 kfree(evt);
 396         }
 397
 398         blk_put_queue(sdev->request_queue);
 399         /* NULL queue means the device can't be used */
 400         sdev->request_queue = NULL;
 401
 402         scsi_target_reap(scsi_target(sdev));
 403
 404         kfree(sdev->inquiry);
 405         kfree(sdev);
 406
 407         if (parent)
 408                 put_device(parent);
 409 }
 410
 411 static void scsi_device_dev_release(struct device *dev)
 412 {
 413         struct scsi_device *sdp = to_scsi_device(dev);
 414         execute_in_process_context(scsi_device_dev_release_usercontext,
 415                                    &sdp->ew);
 416 }
 417
 418 static struct class sdev_class = {
 419         .name           = "scsi_device",
 420         .dev_release    = scsi_device_cls_release,
 421 };
 422
 423 /* all probing is done in the individual ->probe routines */
 424 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 425 {
 426         struct scsi_device *sdp;
 427
 428         if (dev->type != &scsi_dev_type)
 429                 return 0;
 430
 431         sdp = to_scsi_device(dev);
 432         if (sdp->no_uld_attach)
 433                 return 0;
 434         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 435 }
 436
 437 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 438 {
 439         struct scsi_device *sdev;
 440
 441         if (dev->type != &scsi_dev_type)
 442                 return 0;
 443
 444         sdev = to_scsi_device(dev);
 445
 446         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 447         return 0;
 448 }
 449
 450 struct bus_type scsi_bus_type = {
 451         .name           = "scsi",
 452         .match          = scsi_bus_match,
 453         .uevent         = scsi_bus_uevent,
 454 #ifdef CONFIG_PM
 455         .pm             = &scsi_bus_pm_ops,
 456 #endif
 457 };
 458 EXPORT_SYMBOL_GPL(scsi_bus_type);
 459
 460 int scsi_sysfs_register(void)
 461 {
 462         int error;
 463
 464         error = bus_register(&scsi_bus_type);
 465         if (!error) {
 466                 error = class_register(&sdev_class);
 467                 if (error)
 468                         bus_unregister(&scsi_bus_type);
 469         }
 470
 471         return error;
 472 }
 473
 474 void scsi_sysfs_unregister(void)
 475 {
 476         class_unregister(&sdev_class);
 477         bus_unregister(&scsi_bus_type);
 478 }
 479
 480 /*
 481  * sdev_show_function: macro to create an attr function that can be used to
 482  * show a non-bit field.
 483  */
 484 #define sdev_show_function(field, format_string)                                \
 485 static ssize_t                                                          \
 486 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 487                    char *buf)                                           \
 488 {                                                                       \
 489         struct scsi_device *sdev;                                       \
 490         sdev = to_scsi_device(dev);                                     \
 491         return snprintf (buf, 20, format_string, sdev->field);          \
 492 }                                                                       \
 493
 494 /*
 495  * sdev_rd_attr: macro to create a function and attribute variable for a
 496  * read only field.
 497  */
 498 #define sdev_rd_attr(field, format_string)                              \
 499         sdev_show_function(field, format_string)                        \
 500 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 501
 502
 503 /*
 504  * sdev_rw_attr: create a function and attribute variable for a
 505  * read/write field.
 506  */
 507 #define sdev_rw_attr(field, format_string)                              \
 508         sdev_show_function(field, format_string)                                \
 509                                                                         \
 510 static ssize_t                                                          \
 511 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 512                     const char *buf, size_t count)                      \
 513 {                                                                       \
 514         struct scsi_device *sdev;                                       \
 515         sdev = to_scsi_device(dev);                                     \
 516         sscanf (buf, format_string, &sdev->field);                      \
 517         return count;                                                   \
 518 }                                                                       \
 519 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 520
 521 /* Currently we don't export bit fields, but we might in future,
 522  * so leave this code in */
 523 #if 0
 524 /*
 525  * sdev_rd_attr: create a function and attribute variable for a
 526  * read/write bit field.
 527  */
 528 #define sdev_rw_attr_bit(field)                                         \
 529         sdev_show_function(field, "%d\n")                                       \
 530                                                                         \
 531 static ssize_t                                                          \
 532 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 533                     const char *buf, size_t count)                      \
 534 {                                                                       \
 535         int ret;                                                        \
 536         struct scsi_device *sdev;                                       \
 537         ret = scsi_sdev_check_buf_bit(buf);                             \
 538         if (ret >= 0)   {                                               \
 539                 sdev = to_scsi_device(dev);                             \
 540                 sdev->field = ret;                                      \
 541                 ret = count;                                            \
 542         }                                                               \
 543         return ret;                                                     \
 544 }                                                                       \
 545 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 546
 547 /*
 548  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 549  * else return -EINVAL.
 550  */
 551 static int scsi_sdev_check_buf_bit(const char *buf)
 552 {
 553         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 554                 if (buf[0] == '1')
 555                         return 1;
 556                 else if (buf[0] == '0')
 557                         return 0;
 558                 else
 559                         return -EINVAL;
 560         } else
 561                 return -EINVAL;
 562 }
 563 #endif
 564 /*
 565  * Create the actual show/store functions and data structures.
 566  */
 567 sdev_rd_attr (device_blocked, "%d\n");
 568 sdev_rd_attr (queue_depth, "%d\n");
 569 sdev_rd_attr (device_busy, "%d\n");
 570 sdev_rd_attr (type, "%d\n");
 571 sdev_rd_attr (scsi_level, "%d\n");
 572 sdev_rd_attr (vendor, "%.8s\n");
 573 sdev_rd_attr (model, "%.16s\n");
 574 sdev_rd_attr (rev, "%.4s\n");
 575
 576 /*
 577  * TODO: can we make these symlinks to the block layer ones?
 578  */
 579 static ssize_t
 580 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 581 {
 582         struct scsi_device *sdev;
 583         sdev = to_scsi_device(dev);
 584         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 585 }
 586
 587 static ssize_t
 588 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 589                     const char *buf, size_t count)
 590 {
 591         struct scsi_device *sdev;
 592         int timeout;
 593         sdev = to_scsi_device(dev);
 594         sscanf (buf, "%d\n", &timeout);
 595         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 596         return count;
 597 }
 598 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 599
 600 static ssize_t
 601 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 602 {
 603         struct scsi_device *sdev;
 604         sdev = to_scsi_device(dev);
 605         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 606 }
 607
 608 static ssize_t
 609 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 610                     const char *buf, size_t count)
 611 {
 612         struct scsi_device *sdev;
 613         unsigned int eh_timeout;
 614         int err;
 615
 616         if (!capable(CAP_SYS_ADMIN))
 617                 return -EACCES;
 618
 619         sdev = to_scsi_device(dev);
 620         err = kstrtouint(buf, 10, &eh_timeout);
 621         if (err)
 622                 return err;
 623         sdev->eh_timeout = eh_timeout * HZ;
 624
 625         return count;
 626 }
 627 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 628
 629 static ssize_t
 630 store_rescan_field (struct device *dev, struct device_attribute *attr,
 631                     const char *buf, size_t count)
 632 {
 633         scsi_rescan_device(dev);
 634         return count;
 635 }
 636 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 637
 638 static ssize_t
 639 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 640                   const char *buf, size_t count)
 641 {
 642         if (device_remove_file_self(dev, attr))
 643                 scsi_remove_device(to_scsi_device(dev));
 644         return count;
 645 };
 646 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 647
 648 static ssize_t
 649 store_state_field(struct device *dev, struct device_attribute *attr,
 650                   const char *buf, size_t count)
 651 {
 652         int i;
 653         struct scsi_device *sdev = to_scsi_device(dev);
 654         enum scsi_device_state state = 0;
 655
 656         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 657                 const int len = strlen(sdev_states[i].name);
 658                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 659                    buf[len] == '\n') {
 660                         state = sdev_states[i].value;
 661                         break;
 662                 }
 663         }
 664         if (!state)
 665                 return -EINVAL;
 666
 667         if (scsi_device_set_state(sdev, state))
 668                 return -EINVAL;
 669         return count;
 670 }
 671
 672 static ssize_t
 673 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 674 {
 675         struct scsi_device *sdev = to_scsi_device(dev);
 676         const char *name = scsi_device_state_name(sdev->sdev_state);
 677
 678         if (!name)
 679                 return -EINVAL;
 680
 681         return snprintf(buf, 20, "%s\n", name);
 682 }
 683
 684 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 685
 686 static ssize_t
 687 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 688                       char *buf)
 689 {
 690         struct scsi_device *sdev = to_scsi_device(dev);
 691         const char *name = "none";
 692
 693         if (sdev->ordered_tags)
 694                 name = "ordered";
 695         else if (sdev->simple_tags)
 696                 name = "simple";
 697
 698         return snprintf(buf, 20, "%s\n", name);
 699 }
 700
 701 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 702
 703 static ssize_t
 704 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 705 {
 706         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 707 }
 708
 709 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 710
 711 #define show_sdev_iostat(field)                                         \
 712 static ssize_t                                                          \
 713 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 714                     char *buf)                                          \
 715 {                                                                       \
 716         struct scsi_device *sdev = to_scsi_device(dev);                 \
 717         unsigned long long count = atomic_read(&sdev->field);           \
 718         return snprintf(buf, 20, "0x%llx\n", count);                    \
 719 }                                                                       \
 720 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 721
 722 show_sdev_iostat(iorequest_cnt);
 723 show_sdev_iostat(iodone_cnt);
 724 show_sdev_iostat(ioerr_cnt);
 725
 726 static ssize_t
 727 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 728 {
 729         struct scsi_device *sdev;
 730         sdev = to_scsi_device(dev);
 731         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 732 }
 733 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 734
 735 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 736 static ssize_t                                                          \
 737 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 738                      char *buf)                                         \
 739 {                                                                       \
 740         struct scsi_device *sdev = to_scsi_device(dev);                 \
 741         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 742         return snprintf(buf, 20, "%d\n", val);                          \
 743 }
 744
 745 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 746 static ssize_t                                                          \
 747 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 748                       const char *buf, size_t count)                    \
 749 {                                                                       \
 750         struct scsi_device *sdev = to_scsi_device(dev);                 \
 751         int val = simple_strtoul(buf, NULL, 0);                         \
 752         if (val == 0)                                                   \
 753                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 754         else if (val == 1)                                              \
 755                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 756         else                                                            \
 757                 return -EINVAL;                                         \
 758         return count;                                                   \
 759 }
 760
 761 #define DECLARE_EVT(name, Cap_name)                                     \
 762         DECLARE_EVT_SHOW(name, Cap_name)                                \
 763         DECLARE_EVT_STORE(name, Cap_name)                               \
 764         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 765                            sdev_store_evt_##name);
 766 #define REF_EVT(name) &dev_attr_evt_##name.attr
 767
 768 DECLARE_EVT(media_change, MEDIA_CHANGE)
 769 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 770 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 771 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 772 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 773 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 774
 775 /* Default template for device attributes.  May NOT be modified */
 776 static struct attribute *scsi_sdev_attrs[] = {
 777         &dev_attr_device_blocked.attr,
 778         &dev_attr_type.attr,
 779         &dev_attr_scsi_level.attr,
 780         &dev_attr_device_busy.attr,
 781         &dev_attr_vendor.attr,
 782         &dev_attr_model.attr,
 783         &dev_attr_rev.attr,
 784         &dev_attr_rescan.attr,
 785         &dev_attr_delete.attr,
 786         &dev_attr_state.attr,
 787         &dev_attr_timeout.attr,
 788         &dev_attr_eh_timeout.attr,
 789         &dev_attr_iocounterbits.attr,
 790         &dev_attr_iorequest_cnt.attr,
 791         &dev_attr_iodone_cnt.attr,
 792         &dev_attr_ioerr_cnt.attr,
 793         &dev_attr_modalias.attr,
 794         REF_EVT(media_change),
 795         REF_EVT(inquiry_change_reported),
 796         REF_EVT(capacity_change_reported),
 797         REF_EVT(soft_threshold_reached),
 798         REF_EVT(mode_parameter_change_reported),
 799         REF_EVT(lun_change_reported),
 800         NULL
 801 };
 802
 803 static struct attribute_group scsi_sdev_attr_group = {
 804         .attrs =        scsi_sdev_attrs,
 805 };
 806
 807 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 808         &scsi_sdev_attr_group,
 809         NULL
 810 };
 811
 812 static ssize_t
 813 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 814                           const char *buf, size_t count)
 815 {
 816         int depth, retval;
 817         struct scsi_device *sdev = to_scsi_device(dev);
 818         struct scsi_host_template *sht = sdev->host->hostt;
 819
 820         if (!sht->change_queue_depth)
 821                 return -EINVAL;
 822
 823         depth = simple_strtoul(buf, NULL, 0);
 824
 825         if (depth < 1)
 826                 return -EINVAL;
 827
 828         retval = sht->change_queue_depth(sdev, depth,
 829                                          SCSI_QDEPTH_DEFAULT);
 830         if (retval < 0)
 831                 return retval;
 832
 833         sdev->max_queue_depth = sdev->queue_depth;
 834
 835         return count;
 836 }
 837
 838 static struct device_attribute sdev_attr_queue_depth_rw =
 839         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 840                sdev_store_queue_depth_rw);
 841
 842 static ssize_t
 843 sdev_show_queue_ramp_up_period(struct device *dev,
 844                                struct device_attribute *attr,
 845                                char *buf)
 846 {
 847         struct scsi_device *sdev;
 848         sdev = to_scsi_device(dev);
 849         return snprintf(buf, 20, "%u\n",
 850                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 851 }
 852
 853 static ssize_t
 854 sdev_store_queue_ramp_up_period(struct device *dev,
 855                                 struct device_attribute *attr,
 856                                 const char *buf, size_t count)
 857 {
 858         struct scsi_device *sdev = to_scsi_device(dev);
 859         unsigned long period;
 860
 861         if (strict_strtoul(buf, 10, &period))
 862                 return -EINVAL;
 863
 864         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 865         return period;
 866 }
 867
 868 static struct device_attribute sdev_attr_queue_ramp_up_period =
 869         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 870                sdev_show_queue_ramp_up_period,
 871                sdev_store_queue_ramp_up_period);
 872
 873 static ssize_t
 874 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 875                          const char *buf, size_t count)
 876 {
 877         struct scsi_device *sdev = to_scsi_device(dev);
 878         struct scsi_host_template *sht = sdev->host->hostt;
 879         int tag_type = 0, retval;
 880         int prev_tag_type = scsi_get_tag_type(sdev);
 881
 882         if (!sdev->tagged_supported || !sht->change_queue_type)
 883                 return -EINVAL;
 884
 885         if (strncmp(buf, "ordered", 7) == 0)
 886                 tag_type = MSG_ORDERED_TAG;
 887         else if (strncmp(buf, "simple", 6) == 0)
 888                 tag_type = MSG_SIMPLE_TAG;
 889         else if (strncmp(buf, "none", 4) != 0)
 890                 return -EINVAL;
 891
 892         if (tag_type == prev_tag_type)
 893                 return count;
 894
 895         retval = sht->change_queue_type(sdev, tag_type);
 896         if (retval < 0)
 897                 return retval;
 898
 899         return count;
 900 }
 901
 902 static int scsi_target_add(struct scsi_target *starget)
 903 {
 904         int error;
 905
 906         if (starget->state != STARGET_CREATED)
 907                 return 0;
 908
 909         error = device_add(&starget->dev);
 910         if (error) {
 911                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 912                 return error;
 913         }
 914         transport_add_device(&starget->dev);
 915         starget->state = STARGET_RUNNING;
 916
 917         pm_runtime_set_active(&starget->dev);
 918         pm_runtime_enable(&starget->dev);
 919         device_enable_async_suspend(&starget->dev);
 920
 921         return 0;
 922 }
 923
 924 static struct device_attribute sdev_attr_queue_type_rw =
 925         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 926                sdev_store_queue_type_rw);
 927
 928 /**
 929  * scsi_sysfs_add_sdev - add scsi device to sysfs
 930  * @sdev:       scsi_device to add
 931  *
 932  * Return value:
 933  *      0 on Success / non-zero on Failure
 934  **/
 935 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 936 {
 937         int error, i;
 938         struct request_queue *rq = sdev->request_queue;
 939         struct scsi_target *starget = sdev->sdev_target;
 940
 941         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 942         if (error)
 943                 return error;
 944
 945         error = scsi_target_add(starget);
 946         if (error)
 947                 return error;
 948
 949         transport_configure_device(&starget->dev);
 950
 951         device_enable_async_suspend(&sdev->sdev_gendev);
 952         scsi_autopm_get_target(starget);
 953         pm_runtime_set_active(&sdev->sdev_gendev);
 954         pm_runtime_forbid(&sdev->sdev_gendev);
 955         pm_runtime_enable(&sdev->sdev_gendev);
 956         scsi_autopm_put_target(starget);
 957
 958         /* The following call will keep sdev active indefinitely, until
 959          * its driver does a corresponding scsi_autopm_pm_device().  Only
 960          * drivers supporting autosuspend will do this.
 961          */
 962         scsi_autopm_get_device(sdev);
 963
 964         error = device_add(&sdev->sdev_gendev);
 965         if (error) {
 966                 sdev_printk(KERN_INFO, sdev,
 967                                 "failed to add device: %d\n", error);
 968                 return error;
 969         }
 970         device_enable_async_suspend(&sdev->sdev_dev);
 971         error = device_add(&sdev->sdev_dev);
 972         if (error) {
 973                 sdev_printk(KERN_INFO, sdev,
 974                                 "failed to add class device: %d\n", error);
 975                 device_del(&sdev->sdev_gendev);
 976                 return error;
 977         }
 978         transport_add_device(&sdev->sdev_gendev);
 979         sdev->is_visible = 1;
 980
 981         /* create queue files, which may be writable, depending on the host */
 982         if (sdev->host->hostt->change_queue_depth) {
 983                 error = device_create_file(&sdev->sdev_gendev,
 984                                            &sdev_attr_queue_depth_rw);
 985                 error = device_create_file(&sdev->sdev_gendev,
 986                                            &sdev_attr_queue_ramp_up_period);
 987         }
 988         else
 989                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 990         if (error)
 991                 return error;
 992
 993         if (sdev->host->hostt->change_queue_type)
 994                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 995         else
 996                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 997         if (error)
 998                 return error;
 999
1000         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1001
1002         if (error)
1003                 /* we're treating error on bsg register as non-fatal,
1004                  * so pretend nothing went wrong */
1005                 sdev_printk(KERN_INFO, sdev,
1006                             "Failed to register bsg queue, errno=%d\n", error);
1007
1008         /* add additional host specific attributes */
1009         if (sdev->host->hostt->sdev_attrs) {
1010                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1011                         error = device_create_file(&sdev->sdev_gendev,
1012                                         sdev->host->hostt->sdev_attrs[i]);
1013                         if (error)
1014                                 return error;
1015                 }
1016         }
1017
1018         return error;
1019 }
1020
1021 void __scsi_remove_device(struct scsi_device *sdev)
1022 {
1023         struct device *dev = &sdev->sdev_gendev;
1024
1025         if (sdev->is_visible) {
1026                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
1027                         return;
1028
1029                 bsg_unregister_queue(sdev->request_queue);
1030                 device_unregister(&sdev->sdev_dev);
1031                 transport_remove_device(dev);
1032                 device_del(dev);
1033         } else
1034                 put_device(&sdev->sdev_dev);
1035
1036         /*
1037          * Stop accepting new requests and wait until all queuecommand() and
1038          * scsi_run_queue() invocations have finished before tearing down the
1039          * device.
1040          */
1041         scsi_device_set_state(sdev, SDEV_DEL);
1042         blk_cleanup_queue(sdev->request_queue);
1043         cancel_work_sync(&sdev->requeue_work);
1044
1045         if (sdev->host->hostt->slave_destroy)
1046                 sdev->host->hostt->slave_destroy(sdev);
1047         transport_destroy_device(dev);
1048
1049         put_device(dev);
1050 }
1051
1052 /**
1053  * scsi_remove_device - unregister a device from the scsi bus
1054  * @sdev:       scsi_device to unregister
1055  **/
1056 void scsi_remove_device(struct scsi_device *sdev)
1057 {
1058         struct Scsi_Host *shost = sdev->host;
1059
1060         mutex_lock(&shost->scan_mutex);
1061         __scsi_remove_device(sdev);
1062         mutex_unlock(&shost->scan_mutex);
1063 }
1064 EXPORT_SYMBOL(scsi_remove_device);
1065
1066 static void __scsi_remove_target(struct scsi_target *starget)
1067 {
1068         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1069         unsigned long flags;
1070         struct scsi_device *sdev;
1071
1072         spin_lock_irqsave(shost->host_lock, flags);
1073  restart:
1074         list_for_each_entry(sdev, &shost->__devices, siblings) {
1075                 if (sdev->channel != starget->channel ||
1076                     sdev->id != starget->id ||
1077                     scsi_device_get(sdev))
1078                         continue;
1079                 spin_unlock_irqrestore(shost->host_lock, flags);
1080                 scsi_remove_device(sdev);
1081                 scsi_device_put(sdev);
1082                 spin_lock_irqsave(shost->host_lock, flags);
1083                 goto restart;
1084         }
1085         spin_unlock_irqrestore(shost->host_lock, flags);
1086 }
1087
1088 /**
1089  * scsi_remove_target - try to remove a target and all its devices
1090  * @dev: generic starget or parent of generic stargets to be removed
1091  *
1092  * Note: This is slightly racy.  It is possible that if the user
1093  * requests the addition of another device then the target won't be
1094  * removed.
1095  */
1096 void scsi_remove_target(struct device *dev)
1097 {
1098         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1099         struct scsi_target *starget, *last = NULL;
1100         unsigned long flags;
1101
1102         /* remove targets being careful to lookup next entry before
1103          * deleting the last
1104          */
1105         spin_lock_irqsave(shost->host_lock, flags);
1106         list_for_each_entry(starget, &shost->__targets, siblings) {
1107                 if (starget->state == STARGET_DEL)
1108                         continue;
1109                 if (starget->dev.parent == dev || &starget->dev == dev) {
1110                         /* assuming new targets arrive at the end */
1111                         starget->reap_ref++;
1112                         spin_unlock_irqrestore(shost->host_lock, flags);
1113                         if (last)
1114                                 scsi_target_reap(last);
1115                         last = starget;
1116                         __scsi_remove_target(starget);
1117                         spin_lock_irqsave(shost->host_lock, flags);
1118                 }
1119         }
1120         spin_unlock_irqrestore(shost->host_lock, flags);
1121
1122         if (last)
1123                 scsi_target_reap(last);
1124 }
1125 EXPORT_SYMBOL(scsi_remove_target);
1126
1127 int scsi_register_driver(struct device_driver *drv)
1128 {
1129         drv->bus = &scsi_bus_type;
1130
1131         return driver_register(drv);
1132 }
1133 EXPORT_SYMBOL(scsi_register_driver);
1134
1135 int scsi_register_interface(struct class_interface *intf)
1136 {
1137         intf->class = &sdev_class;
1138
1139         return class_interface_register(intf);
1140 }
1141 EXPORT_SYMBOL(scsi_register_interface);
1142
1143 /**
1144  * scsi_sysfs_add_host - add scsi host to subsystem
1145  * @shost:     scsi host struct to add to subsystem
1146  **/
1147 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1148 {
1149         int error, i;
1150
1151         /* add host specific attributes */
1152         if (shost->hostt->shost_attrs) {
1153                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1154                         error = device_create_file(&shost->shost_dev,
1155                                         shost->hostt->shost_attrs[i]);
1156                         if (error)
1157                                 return error;
1158                 }
1159         }
1160
1161         transport_register_device(&shost->shost_gendev);
1162         transport_configure_device(&shost->shost_gendev);
1163         return 0;
1164 }
1165
1166 static struct device_type scsi_dev_type = {
1167         .name =         "scsi_device",
1168         .release =      scsi_device_dev_release,
1169         .groups =       scsi_sdev_attr_groups,
1170 };
1171
1172 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1173 {
1174         unsigned long flags;
1175         struct Scsi_Host *shost = sdev->host;
1176         struct scsi_target  *starget = sdev->sdev_target;
1177
1178         device_initialize(&sdev->sdev_gendev);
1179         sdev->sdev_gendev.bus = &scsi_bus_type;
1180         sdev->sdev_gendev.type = &scsi_dev_type;
1181         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1182                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1183
1184         device_initialize(&sdev->sdev_dev);
1185         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1186         sdev->sdev_dev.class = &sdev_class;
1187         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1188                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1189         sdev->scsi_level = starget->scsi_level;
1190         transport_setup_device(&sdev->sdev_gendev);
1191         spin_lock_irqsave(shost->host_lock, flags);
1192         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1193         list_add_tail(&sdev->siblings, &shost->__devices);
1194         spin_unlock_irqrestore(shost->host_lock, flags);
1195 }
1196
1197 int scsi_is_sdev_device(const struct device *dev)
1198 {
1199         return dev->type == &scsi_dev_type;
1200 }
1201 EXPORT_SYMBOL(scsi_is_sdev_device);
1202
1203 /* A blank transport template that is used in drivers that don't
1204  * yet implement Transport Attributes */
1205 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };