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