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(sg_prot_tablesize, "%hu\n");
 255 shost_rd_attr(unchecked_isa_dma, "%d\n");
 256 shost_rd_attr(prot_capabilities, "%u\n");
 257 shost_rd_attr(prot_guard_type, "%hd\n");
 258 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 259
 260 static struct attribute *scsi_sysfs_shost_attrs[] = {
 261         &dev_attr_unique_id.attr,
 262         &dev_attr_host_busy.attr,
 263         &dev_attr_cmd_per_lun.attr,
 264         &dev_attr_can_queue.attr,
 265         &dev_attr_sg_tablesize.attr,
 266         &dev_attr_sg_prot_tablesize.attr,
 267         &dev_attr_unchecked_isa_dma.attr,
 268         &dev_attr_proc_name.attr,
 269         &dev_attr_scan.attr,
 270         &dev_attr_hstate.attr,
 271         &dev_attr_supported_mode.attr,
 272         &dev_attr_active_mode.attr,
 273         &dev_attr_prot_capabilities.attr,
 274         &dev_attr_prot_guard_type.attr,
 275         NULL
 276 };
 277
 278 struct attribute_group scsi_shost_attr_group = {
 279         .attrs =        scsi_sysfs_shost_attrs,
 280 };
 281
 282 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 283         &scsi_shost_attr_group,
 284         NULL
 285 };
 286
 287 static void scsi_device_cls_release(struct device *class_dev)
 288 {
 289         struct scsi_device *sdev;
 290
 291         sdev = class_to_sdev(class_dev);
 292         put_device(&sdev->sdev_gendev);
 293 }
 294
 295 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 296 {
 297         struct scsi_device *sdev;
 298         struct device *parent;
 299         struct scsi_target *starget;
 300         struct list_head *this, *tmp;
 301         unsigned long flags;
 302
 303         sdev = container_of(work, struct scsi_device, ew.work);
 304
 305         parent = sdev->sdev_gendev.parent;
 306         starget = to_scsi_target(parent);
 307
 308         spin_lock_irqsave(sdev->host->host_lock, flags);
 309         starget->reap_ref++;
 310         list_del(&sdev->siblings);
 311         list_del(&sdev->same_target_siblings);
 312         list_del(&sdev->starved_entry);
 313         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 314
 315         cancel_work_sync(&sdev->event_work);
 316
 317         list_for_each_safe(this, tmp, &sdev->event_list) {
 318                 struct scsi_event *evt;
 319
 320                 evt = list_entry(this, struct scsi_event, node);
 321                 list_del(&evt->node);
 322                 kfree(evt);
 323         }
 324
 325         if (sdev->request_queue) {
 326                 sdev->request_queue->queuedata = NULL;
 327                 /* user context needed to free queue */
 328                 scsi_free_queue(sdev->request_queue);
 329                 /* temporary expedient, try to catch use of queue lock
 330                  * after free of sdev */
 331                 sdev->request_queue = NULL;
 332         }
 333
 334         scsi_target_reap(scsi_target(sdev));
 335
 336         kfree(sdev->inquiry);
 337         kfree(sdev);
 338
 339         if (parent)
 340                 put_device(parent);
 341 }
 342
 343 static void scsi_device_dev_release(struct device *dev)
 344 {
 345         struct scsi_device *sdp = to_scsi_device(dev);
 346         execute_in_process_context(scsi_device_dev_release_usercontext,
 347                                    &sdp->ew);
 348 }
 349
 350 static struct class sdev_class = {
 351         .name           = "scsi_device",
 352         .dev_release    = scsi_device_cls_release,
 353 };
 354
 355 /* all probing is done in the individual ->probe routines */
 356 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 357 {
 358         struct scsi_device *sdp;
 359
 360         if (dev->type != &scsi_dev_type)
 361                 return 0;
 362
 363         sdp = to_scsi_device(dev);
 364         if (sdp->no_uld_attach)
 365                 return 0;
 366         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 367 }
 368
 369 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 370 {
 371         struct scsi_device *sdev;
 372
 373         if (dev->type != &scsi_dev_type)
 374                 return 0;
 375
 376         sdev = to_scsi_device(dev);
 377
 378         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 379         return 0;
 380 }
 381
 382 struct bus_type scsi_bus_type = {
 383         .name           = "scsi",
 384         .match          = scsi_bus_match,
 385         .uevent         = scsi_bus_uevent,
 386 #ifdef CONFIG_PM_OPS
 387         .pm             = &scsi_bus_pm_ops,
 388 #endif
 389 };
 390 EXPORT_SYMBOL_GPL(scsi_bus_type);
 391
 392 int scsi_sysfs_register(void)
 393 {
 394         int error;
 395
 396         error = bus_register(&scsi_bus_type);
 397         if (!error) {
 398                 error = class_register(&sdev_class);
 399                 if (error)
 400                         bus_unregister(&scsi_bus_type);
 401         }
 402
 403         return error;
 404 }
 405
 406 void scsi_sysfs_unregister(void)
 407 {
 408         class_unregister(&sdev_class);
 409         bus_unregister(&scsi_bus_type);
 410 }
 411
 412 /*
 413  * sdev_show_function: macro to create an attr function that can be used to
 414  * show a non-bit field.
 415  */
 416 #define sdev_show_function(field, format_string)                                \
 417 static ssize_t                                                          \
 418 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 419                    char *buf)                                           \
 420 {                                                                       \
 421         struct scsi_device *sdev;                                       \
 422         sdev = to_scsi_device(dev);                                     \
 423         return snprintf (buf, 20, format_string, sdev->field);          \
 424 }                                                                       \
 425
 426 /*
 427  * sdev_rd_attr: macro to create a function and attribute variable for a
 428  * read only field.
 429  */
 430 #define sdev_rd_attr(field, format_string)                              \
 431         sdev_show_function(field, format_string)                        \
 432 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 433
 434
 435 /*
 436  * sdev_rw_attr: create a function and attribute variable for a
 437  * read/write field.
 438  */
 439 #define sdev_rw_attr(field, format_string)                              \
 440         sdev_show_function(field, format_string)                                \
 441                                                                         \
 442 static ssize_t                                                          \
 443 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 444                     const char *buf, size_t count)                      \
 445 {                                                                       \
 446         struct scsi_device *sdev;                                       \
 447         sdev = to_scsi_device(dev);                                     \
 448         sscanf (buf, format_string, &sdev->field);                      \
 449         return count;                                                   \
 450 }                                                                       \
 451 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 452
 453 /* Currently we don't export bit fields, but we might in future,
 454  * so leave this code in */
 455 #if 0
 456 /*
 457  * sdev_rd_attr: create a function and attribute variable for a
 458  * read/write bit field.
 459  */
 460 #define sdev_rw_attr_bit(field)                                         \
 461         sdev_show_function(field, "%d\n")                                       \
 462                                                                         \
 463 static ssize_t                                                          \
 464 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 465                     const char *buf, size_t count)                      \
 466 {                                                                       \
 467         int ret;                                                        \
 468         struct scsi_device *sdev;                                       \
 469         ret = scsi_sdev_check_buf_bit(buf);                             \
 470         if (ret >= 0)   {                                               \
 471                 sdev = to_scsi_device(dev);                             \
 472                 sdev->field = ret;                                      \
 473                 ret = count;                                            \
 474         }                                                               \
 475         return ret;                                                     \
 476 }                                                                       \
 477 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 478
 479 /*
 480  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 481  * else return -EINVAL.
 482  */
 483 static int scsi_sdev_check_buf_bit(const char *buf)
 484 {
 485         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 486                 if (buf[0] == '1')
 487                         return 1;
 488                 else if (buf[0] == '0')
 489                         return 0;
 490                 else
 491                         return -EINVAL;
 492         } else
 493                 return -EINVAL;
 494 }
 495 #endif
 496 /*
 497  * Create the actual show/store functions and data structures.
 498  */
 499 sdev_rd_attr (device_blocked, "%d\n");
 500 sdev_rd_attr (queue_depth, "%d\n");
 501 sdev_rd_attr (type, "%d\n");
 502 sdev_rd_attr (scsi_level, "%d\n");
 503 sdev_rd_attr (vendor, "%.8s\n");
 504 sdev_rd_attr (model, "%.16s\n");
 505 sdev_rd_attr (rev, "%.4s\n");
 506
 507 /*
 508  * TODO: can we make these symlinks to the block layer ones?
 509  */
 510 static ssize_t
 511 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 512 {
 513         struct scsi_device *sdev;
 514         sdev = to_scsi_device(dev);
 515         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 516 }
 517
 518 static ssize_t
 519 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 520                     const char *buf, size_t count)
 521 {
 522         struct scsi_device *sdev;
 523         int timeout;
 524         sdev = to_scsi_device(dev);
 525         sscanf (buf, "%d\n", &timeout);
 526         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 527         return count;
 528 }
 529 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 530
 531 static ssize_t
 532 store_rescan_field (struct device *dev, struct device_attribute *attr,
 533                     const char *buf, size_t count)
 534 {
 535         scsi_rescan_device(dev);
 536         return count;
 537 }
 538 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 539
 540 static void sdev_store_delete_callback(struct device *dev)
 541 {
 542         scsi_remove_device(to_scsi_device(dev));
 543 }
 544
 545 static ssize_t
 546 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 547                   const char *buf, size_t count)
 548 {
 549         int rc;
 550
 551         /* An attribute cannot be unregistered by one of its own methods,
 552          * so we have to use this roundabout approach.
 553          */
 554         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 555         if (rc)
 556                 count = rc;
 557         return count;
 558 };
 559 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 560
 561 static ssize_t
 562 store_state_field(struct device *dev, struct device_attribute *attr,
 563                   const char *buf, size_t count)
 564 {
 565         int i;
 566         struct scsi_device *sdev = to_scsi_device(dev);
 567         enum scsi_device_state state = 0;
 568
 569         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 570                 const int len = strlen(sdev_states[i].name);
 571                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 572                    buf[len] == '\n') {
 573                         state = sdev_states[i].value;
 574                         break;
 575                 }
 576         }
 577         if (!state)
 578                 return -EINVAL;
 579
 580         if (scsi_device_set_state(sdev, state))
 581                 return -EINVAL;
 582         return count;
 583 }
 584
 585 static ssize_t
 586 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 587 {
 588         struct scsi_device *sdev = to_scsi_device(dev);
 589         const char *name = scsi_device_state_name(sdev->sdev_state);
 590
 591         if (!name)
 592                 return -EINVAL;
 593
 594         return snprintf(buf, 20, "%s\n", name);
 595 }
 596
 597 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 598
 599 static ssize_t
 600 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 601                       char *buf)
 602 {
 603         struct scsi_device *sdev = to_scsi_device(dev);
 604         const char *name = "none";
 605
 606         if (sdev->ordered_tags)
 607                 name = "ordered";
 608         else if (sdev->simple_tags)
 609                 name = "simple";
 610
 611         return snprintf(buf, 20, "%s\n", name);
 612 }
 613
 614 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 615
 616 static ssize_t
 617 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 618 {
 619         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 620 }
 621
 622 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 623
 624 #define show_sdev_iostat(field)                                         \
 625 static ssize_t                                                          \
 626 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 627                     char *buf)                                          \
 628 {                                                                       \
 629         struct scsi_device *sdev = to_scsi_device(dev);                 \
 630         unsigned long long count = atomic_read(&sdev->field);           \
 631         return snprintf(buf, 20, "0x%llx\n", count);                    \
 632 }                                                                       \
 633 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 634
 635 show_sdev_iostat(iorequest_cnt);
 636 show_sdev_iostat(iodone_cnt);
 637 show_sdev_iostat(ioerr_cnt);
 638
 639 static ssize_t
 640 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 641 {
 642         struct scsi_device *sdev;
 643         sdev = to_scsi_device(dev);
 644         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 645 }
 646 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 647
 648 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 649 static ssize_t                                                          \
 650 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 651                      char *buf)                                         \
 652 {                                                                       \
 653         struct scsi_device *sdev = to_scsi_device(dev);                 \
 654         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 655         return snprintf(buf, 20, "%d\n", val);                          \
 656 }
 657
 658 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 659 static ssize_t                                                          \
 660 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 661                       const char *buf, size_t count)                    \
 662 {                                                                       \
 663         struct scsi_device *sdev = to_scsi_device(dev);                 \
 664         int val = simple_strtoul(buf, NULL, 0);                         \
 665         if (val == 0)                                                   \
 666                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 667         else if (val == 1)                                              \
 668                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 669         else                                                            \
 670                 return -EINVAL;                                         \
 671         return count;                                                   \
 672 }
 673
 674 #define DECLARE_EVT(name, Cap_name)                                     \
 675         DECLARE_EVT_SHOW(name, Cap_name)                                \
 676         DECLARE_EVT_STORE(name, Cap_name)                               \
 677         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 678                            sdev_store_evt_##name);
 679 #define REF_EVT(name) &dev_attr_evt_##name.attr
 680
 681 DECLARE_EVT(media_change, MEDIA_CHANGE)
 682
 683 /* Default template for device attributes.  May NOT be modified */
 684 static struct attribute *scsi_sdev_attrs[] = {
 685         &dev_attr_device_blocked.attr,
 686         &dev_attr_type.attr,
 687         &dev_attr_scsi_level.attr,
 688         &dev_attr_vendor.attr,
 689         &dev_attr_model.attr,
 690         &dev_attr_rev.attr,
 691         &dev_attr_rescan.attr,
 692         &dev_attr_delete.attr,
 693         &dev_attr_state.attr,
 694         &dev_attr_timeout.attr,
 695         &dev_attr_iocounterbits.attr,
 696         &dev_attr_iorequest_cnt.attr,
 697         &dev_attr_iodone_cnt.attr,
 698         &dev_attr_ioerr_cnt.attr,
 699         &dev_attr_modalias.attr,
 700         REF_EVT(media_change),
 701         NULL
 702 };
 703
 704 static struct attribute_group scsi_sdev_attr_group = {
 705         .attrs =        scsi_sdev_attrs,
 706 };
 707
 708 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 709         &scsi_sdev_attr_group,
 710         NULL
 711 };
 712
 713 static ssize_t
 714 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 715                           const char *buf, size_t count)
 716 {
 717         int depth, retval;
 718         struct scsi_device *sdev = to_scsi_device(dev);
 719         struct scsi_host_template *sht = sdev->host->hostt;
 720
 721         if (!sht->change_queue_depth)
 722                 return -EINVAL;
 723
 724         depth = simple_strtoul(buf, NULL, 0);
 725
 726         if (depth < 1)
 727                 return -EINVAL;
 728
 729         retval = sht->change_queue_depth(sdev, depth,
 730                                          SCSI_QDEPTH_DEFAULT);
 731         if (retval < 0)
 732                 return retval;
 733
 734         sdev->max_queue_depth = sdev->queue_depth;
 735
 736         return count;
 737 }
 738
 739 static struct device_attribute sdev_attr_queue_depth_rw =
 740         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 741                sdev_store_queue_depth_rw);
 742
 743 static ssize_t
 744 sdev_show_queue_ramp_up_period(struct device *dev,
 745                                struct device_attribute *attr,
 746                                char *buf)
 747 {
 748         struct scsi_device *sdev;
 749         sdev = to_scsi_device(dev);
 750         return snprintf(buf, 20, "%u\n",
 751                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 752 }
 753
 754 static ssize_t
 755 sdev_store_queue_ramp_up_period(struct device *dev,
 756                                 struct device_attribute *attr,
 757                                 const char *buf, size_t count)
 758 {
 759         struct scsi_device *sdev = to_scsi_device(dev);
 760         unsigned long period;
 761
 762         if (strict_strtoul(buf, 10, &period))
 763                 return -EINVAL;
 764
 765         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 766         return period;
 767 }
 768
 769 static struct device_attribute sdev_attr_queue_ramp_up_period =
 770         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 771                sdev_show_queue_ramp_up_period,
 772                sdev_store_queue_ramp_up_period);
 773
 774 static ssize_t
 775 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 776                          const char *buf, size_t count)
 777 {
 778         struct scsi_device *sdev = to_scsi_device(dev);
 779         struct scsi_host_template *sht = sdev->host->hostt;
 780         int tag_type = 0, retval;
 781         int prev_tag_type = scsi_get_tag_type(sdev);
 782
 783         if (!sdev->tagged_supported || !sht->change_queue_type)
 784                 return -EINVAL;
 785
 786         if (strncmp(buf, "ordered", 7) == 0)
 787                 tag_type = MSG_ORDERED_TAG;
 788         else if (strncmp(buf, "simple", 6) == 0)
 789                 tag_type = MSG_SIMPLE_TAG;
 790         else if (strncmp(buf, "none", 4) != 0)
 791                 return -EINVAL;
 792
 793         if (tag_type == prev_tag_type)
 794                 return count;
 795
 796         retval = sht->change_queue_type(sdev, tag_type);
 797         if (retval < 0)
 798                 return retval;
 799
 800         return count;
 801 }
 802
 803 static int scsi_target_add(struct scsi_target *starget)
 804 {
 805         int error;
 806
 807         if (starget->state != STARGET_CREATED)
 808                 return 0;
 809
 810         error = device_add(&starget->dev);
 811         if (error) {
 812                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 813                 return error;
 814         }
 815         transport_add_device(&starget->dev);
 816         starget->state = STARGET_RUNNING;
 817
 818         pm_runtime_set_active(&starget->dev);
 819         pm_runtime_enable(&starget->dev);
 820         device_enable_async_suspend(&starget->dev);
 821
 822         return 0;
 823 }
 824
 825 static struct device_attribute sdev_attr_queue_type_rw =
 826         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 827                sdev_store_queue_type_rw);
 828
 829 /**
 830  * scsi_sysfs_add_sdev - add scsi device to sysfs
 831  * @sdev:       scsi_device to add
 832  *
 833  * Return value:
 834  *      0 on Success / non-zero on Failure
 835  **/
 836 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 837 {
 838         int error, i;
 839         struct request_queue *rq = sdev->request_queue;
 840         struct scsi_target *starget = sdev->sdev_target;
 841
 842         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 843         if (error)
 844                 return error;
 845
 846         error = scsi_target_add(starget);
 847         if (error)
 848                 return error;
 849
 850         transport_configure_device(&starget->dev);
 851
 852         device_enable_async_suspend(&sdev->sdev_gendev);
 853         scsi_autopm_get_target(starget);
 854         pm_runtime_set_active(&sdev->sdev_gendev);
 855         pm_runtime_forbid(&sdev->sdev_gendev);
 856         pm_runtime_enable(&sdev->sdev_gendev);
 857         scsi_autopm_put_target(starget);
 858
 859         /* The following call will keep sdev active indefinitely, until
 860          * its driver does a corresponding scsi_autopm_pm_device().  Only
 861          * drivers supporting autosuspend will do this.
 862          */
 863         scsi_autopm_get_device(sdev);
 864
 865         error = device_add(&sdev->sdev_gendev);
 866         if (error) {
 867                 sdev_printk(KERN_INFO, sdev,
 868                                 "failed to add device: %d\n", error);
 869                 return error;
 870         }
 871         device_enable_async_suspend(&sdev->sdev_dev);
 872         error = device_add(&sdev->sdev_dev);
 873         if (error) {
 874                 sdev_printk(KERN_INFO, sdev,
 875                                 "failed to add class device: %d\n", error);
 876                 device_del(&sdev->sdev_gendev);
 877                 return error;
 878         }
 879         transport_add_device(&sdev->sdev_gendev);
 880         sdev->is_visible = 1;
 881
 882         /* create queue files, which may be writable, depending on the host */
 883         if (sdev->host->hostt->change_queue_depth) {
 884                 error = device_create_file(&sdev->sdev_gendev,
 885                                            &sdev_attr_queue_depth_rw);
 886                 error = device_create_file(&sdev->sdev_gendev,
 887                                            &sdev_attr_queue_ramp_up_period);
 888         }
 889         else
 890                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 891         if (error)
 892                 return error;
 893
 894         if (sdev->host->hostt->change_queue_type)
 895                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 896         else
 897                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 898         if (error)
 899                 return error;
 900
 901         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 902
 903         if (error)
 904                 /* we're treating error on bsg register as non-fatal,
 905                  * so pretend nothing went wrong */
 906                 sdev_printk(KERN_INFO, sdev,
 907                             "Failed to register bsg queue, errno=%d\n", error);
 908
 909         /* add additional host specific attributes */
 910         if (sdev->host->hostt->sdev_attrs) {
 911                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 912                         error = device_create_file(&sdev->sdev_gendev,
 913                                         sdev->host->hostt->sdev_attrs[i]);
 914                         if (error)
 915                                 return error;
 916                 }
 917         }
 918
 919         return error;
 920 }
 921
 922 void __scsi_remove_device(struct scsi_device *sdev)
 923 {
 924         struct device *dev = &sdev->sdev_gendev;
 925
 926         if (sdev->is_visible) {
 927                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 928                         return;
 929
 930                 bsg_unregister_queue(sdev->request_queue);
 931                 device_unregister(&sdev->sdev_dev);
 932                 transport_remove_device(dev);
 933                 device_del(dev);
 934         } else
 935                 put_device(&sdev->sdev_dev);
 936         scsi_device_set_state(sdev, SDEV_DEL);
 937         if (sdev->host->hostt->slave_destroy)
 938                 sdev->host->hostt->slave_destroy(sdev);
 939         transport_destroy_device(dev);
 940         put_device(dev);
 941 }
 942
 943 /**
 944  * scsi_remove_device - unregister a device from the scsi bus
 945  * @sdev:       scsi_device to unregister
 946  **/
 947 void scsi_remove_device(struct scsi_device *sdev)
 948 {
 949         struct Scsi_Host *shost = sdev->host;
 950
 951         mutex_lock(&shost->scan_mutex);
 952         __scsi_remove_device(sdev);
 953         mutex_unlock(&shost->scan_mutex);
 954 }
 955 EXPORT_SYMBOL(scsi_remove_device);
 956
 957 static void __scsi_remove_target(struct scsi_target *starget)
 958 {
 959         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 960         unsigned long flags;
 961         struct scsi_device *sdev;
 962
 963         spin_lock_irqsave(shost->host_lock, flags);
 964         starget->reap_ref++;
 965  restart:
 966         list_for_each_entry(sdev, &shost->__devices, siblings) {
 967                 if (sdev->channel != starget->channel ||
 968                     sdev->id != starget->id ||
 969                     scsi_device_get(sdev))
 970                         continue;
 971                 spin_unlock_irqrestore(shost->host_lock, flags);
 972                 scsi_remove_device(sdev);
 973                 scsi_device_put(sdev);
 974                 spin_lock_irqsave(shost->host_lock, flags);
 975                 goto restart;
 976         }
 977         spin_unlock_irqrestore(shost->host_lock, flags);
 978         scsi_target_reap(starget);
 979 }
 980
 981 static int __remove_child (struct device * dev, void * data)
 982 {
 983         if (scsi_is_target_device(dev))
 984                 __scsi_remove_target(to_scsi_target(dev));
 985         return 0;
 986 }
 987
 988 /**
 989  * scsi_remove_target - try to remove a target and all its devices
 990  * @dev: generic starget or parent of generic stargets to be removed
 991  *
 992  * Note: This is slightly racy.  It is possible that if the user
 993  * requests the addition of another device then the target won't be
 994  * removed.
 995  */
 996 void scsi_remove_target(struct device *dev)
 997 {
 998         if (scsi_is_target_device(dev)) {
 999                 __scsi_remove_target(to_scsi_target(dev));
1000                 return;
1001         }
1002
1003         get_device(dev);
1004         device_for_each_child(dev, NULL, __remove_child);
1005         put_device(dev);
1006 }
1007 EXPORT_SYMBOL(scsi_remove_target);
1008
1009 int scsi_register_driver(struct device_driver *drv)
1010 {
1011         drv->bus = &scsi_bus_type;
1012
1013         return driver_register(drv);
1014 }
1015 EXPORT_SYMBOL(scsi_register_driver);
1016
1017 int scsi_register_interface(struct class_interface *intf)
1018 {
1019         intf->class = &sdev_class;
1020
1021         return class_interface_register(intf);
1022 }
1023 EXPORT_SYMBOL(scsi_register_interface);
1024
1025 /**
1026  * scsi_sysfs_add_host - add scsi host to subsystem
1027  * @shost:     scsi host struct to add to subsystem
1028  **/
1029 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1030 {
1031         int error, i;
1032
1033         /* add host specific attributes */
1034         if (shost->hostt->shost_attrs) {
1035                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1036                         error = device_create_file(&shost->shost_dev,
1037                                         shost->hostt->shost_attrs[i]);
1038                         if (error)
1039                                 return error;
1040                 }
1041         }
1042
1043         transport_register_device(&shost->shost_gendev);
1044         transport_configure_device(&shost->shost_gendev);
1045         return 0;
1046 }
1047
1048 static struct device_type scsi_dev_type = {
1049         .name =         "scsi_device",
1050         .release =      scsi_device_dev_release,
1051         .groups =       scsi_sdev_attr_groups,
1052 };
1053
1054 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1055 {
1056         unsigned long flags;
1057         struct Scsi_Host *shost = sdev->host;
1058         struct scsi_target  *starget = sdev->sdev_target;
1059
1060         device_initialize(&sdev->sdev_gendev);
1061         sdev->sdev_gendev.bus = &scsi_bus_type;
1062         sdev->sdev_gendev.type = &scsi_dev_type;
1063         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1064                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1065
1066         device_initialize(&sdev->sdev_dev);
1067         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1068         sdev->sdev_dev.class = &sdev_class;
1069         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1070                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1071         sdev->scsi_level = starget->scsi_level;
1072         transport_setup_device(&sdev->sdev_gendev);
1073         spin_lock_irqsave(shost->host_lock, flags);
1074         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1075         list_add_tail(&sdev->siblings, &shost->__devices);
1076         spin_unlock_irqrestore(shost->host_lock, flags);
1077 }
1078
1079 int scsi_is_sdev_device(const struct device *dev)
1080 {
1081         return dev->type == &scsi_dev_type;
1082 }
1083 EXPORT_SYMBOL(scsi_is_sdev_device);
1084
1085 /* A blank transport template that is used in drivers that don't
1086  * yet implement Transport Attributes */
1087 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };