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         /* NULL queue means the device can't be used */
 326         sdev->request_queue = NULL;
 327
 328         scsi_target_reap(scsi_target(sdev));
 329
 330         kfree(sdev->inquiry);
 331         kfree(sdev);
 332
 333         if (parent)
 334                 put_device(parent);
 335 }
 336
 337 static void scsi_device_dev_release(struct device *dev)
 338 {
 339         struct scsi_device *sdp = to_scsi_device(dev);
 340         execute_in_process_context(scsi_device_dev_release_usercontext,
 341                                    &sdp->ew);
 342 }
 343
 344 static struct class sdev_class = {
 345         .name           = "scsi_device",
 346         .dev_release    = scsi_device_cls_release,
 347 };
 348
 349 /* all probing is done in the individual ->probe routines */
 350 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 351 {
 352         struct scsi_device *sdp;
 353
 354         if (dev->type != &scsi_dev_type)
 355                 return 0;
 356
 357         sdp = to_scsi_device(dev);
 358         if (sdp->no_uld_attach)
 359                 return 0;
 360         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 361 }
 362
 363 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 364 {
 365         struct scsi_device *sdev;
 366
 367         if (dev->type != &scsi_dev_type)
 368                 return 0;
 369
 370         sdev = to_scsi_device(dev);
 371
 372         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 373         return 0;
 374 }
 375
 376 struct bus_type scsi_bus_type = {
 377         .name           = "scsi",
 378         .match          = scsi_bus_match,
 379         .uevent         = scsi_bus_uevent,
 380 #ifdef CONFIG_PM
 381         .pm             = &scsi_bus_pm_ops,
 382 #endif
 383 };
 384 EXPORT_SYMBOL_GPL(scsi_bus_type);
 385
 386 int scsi_sysfs_register(void)
 387 {
 388         int error;
 389
 390         error = bus_register(&scsi_bus_type);
 391         if (!error) {
 392                 error = class_register(&sdev_class);
 393                 if (error)
 394                         bus_unregister(&scsi_bus_type);
 395         }
 396
 397         return error;
 398 }
 399
 400 void scsi_sysfs_unregister(void)
 401 {
 402         class_unregister(&sdev_class);
 403         bus_unregister(&scsi_bus_type);
 404 }
 405
 406 /*
 407  * sdev_show_function: macro to create an attr function that can be used to
 408  * show a non-bit field.
 409  */
 410 #define sdev_show_function(field, format_string)                                \
 411 static ssize_t                                                          \
 412 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 413                    char *buf)                                           \
 414 {                                                                       \
 415         struct scsi_device *sdev;                                       \
 416         sdev = to_scsi_device(dev);                                     \
 417         return snprintf (buf, 20, format_string, sdev->field);          \
 418 }                                                                       \
 419
 420 /*
 421  * sdev_rd_attr: macro to create a function and attribute variable for a
 422  * read only field.
 423  */
 424 #define sdev_rd_attr(field, format_string)                              \
 425         sdev_show_function(field, format_string)                        \
 426 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 427
 428
 429 /*
 430  * sdev_rw_attr: create a function and attribute variable for a
 431  * read/write field.
 432  */
 433 #define sdev_rw_attr(field, format_string)                              \
 434         sdev_show_function(field, format_string)                                \
 435                                                                         \
 436 static ssize_t                                                          \
 437 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 438                     const char *buf, size_t count)                      \
 439 {                                                                       \
 440         struct scsi_device *sdev;                                       \
 441         sdev = to_scsi_device(dev);                                     \
 442         sscanf (buf, format_string, &sdev->field);                      \
 443         return count;                                                   \
 444 }                                                                       \
 445 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 446
 447 /* Currently we don't export bit fields, but we might in future,
 448  * so leave this code in */
 449 #if 0
 450 /*
 451  * sdev_rd_attr: create a function and attribute variable for a
 452  * read/write bit field.
 453  */
 454 #define sdev_rw_attr_bit(field)                                         \
 455         sdev_show_function(field, "%d\n")                                       \
 456                                                                         \
 457 static ssize_t                                                          \
 458 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 459                     const char *buf, size_t count)                      \
 460 {                                                                       \
 461         int ret;                                                        \
 462         struct scsi_device *sdev;                                       \
 463         ret = scsi_sdev_check_buf_bit(buf);                             \
 464         if (ret >= 0)   {                                               \
 465                 sdev = to_scsi_device(dev);                             \
 466                 sdev->field = ret;                                      \
 467                 ret = count;                                            \
 468         }                                                               \
 469         return ret;                                                     \
 470 }                                                                       \
 471 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 472
 473 /*
 474  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 475  * else return -EINVAL.
 476  */
 477 static int scsi_sdev_check_buf_bit(const char *buf)
 478 {
 479         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 480                 if (buf[0] == '1')
 481                         return 1;
 482                 else if (buf[0] == '0')
 483                         return 0;
 484                 else
 485                         return -EINVAL;
 486         } else
 487                 return -EINVAL;
 488 }
 489 #endif
 490 /*
 491  * Create the actual show/store functions and data structures.
 492  */
 493 sdev_rd_attr (device_blocked, "%d\n");
 494 sdev_rd_attr (queue_depth, "%d\n");
 495 sdev_rd_attr (type, "%d\n");
 496 sdev_rd_attr (scsi_level, "%d\n");
 497 sdev_rd_attr (vendor, "%.8s\n");
 498 sdev_rd_attr (model, "%.16s\n");
 499 sdev_rd_attr (rev, "%.4s\n");
 500
 501 /*
 502  * TODO: can we make these symlinks to the block layer ones?
 503  */
 504 static ssize_t
 505 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 506 {
 507         struct scsi_device *sdev;
 508         sdev = to_scsi_device(dev);
 509         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 510 }
 511
 512 static ssize_t
 513 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 514                     const char *buf, size_t count)
 515 {
 516         struct scsi_device *sdev;
 517         int timeout;
 518         sdev = to_scsi_device(dev);
 519         sscanf (buf, "%d\n", &timeout);
 520         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 521         return count;
 522 }
 523 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 524
 525 static ssize_t
 526 store_rescan_field (struct device *dev, struct device_attribute *attr,
 527                     const char *buf, size_t count)
 528 {
 529         scsi_rescan_device(dev);
 530         return count;
 531 }
 532 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 533
 534 static void sdev_store_delete_callback(struct device *dev)
 535 {
 536         scsi_remove_device(to_scsi_device(dev));
 537 }
 538
 539 static ssize_t
 540 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 541                   const char *buf, size_t count)
 542 {
 543         int rc;
 544
 545         /* An attribute cannot be unregistered by one of its own methods,
 546          * so we have to use this roundabout approach.
 547          */
 548         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 549         if (rc)
 550                 count = rc;
 551         return count;
 552 };
 553 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 554
 555 static ssize_t
 556 store_state_field(struct device *dev, struct device_attribute *attr,
 557                   const char *buf, size_t count)
 558 {
 559         int i;
 560         struct scsi_device *sdev = to_scsi_device(dev);
 561         enum scsi_device_state state = 0;
 562
 563         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 564                 const int len = strlen(sdev_states[i].name);
 565                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 566                    buf[len] == '\n') {
 567                         state = sdev_states[i].value;
 568                         break;
 569                 }
 570         }
 571         if (!state)
 572                 return -EINVAL;
 573
 574         if (scsi_device_set_state(sdev, state))
 575                 return -EINVAL;
 576         return count;
 577 }
 578
 579 static ssize_t
 580 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 581 {
 582         struct scsi_device *sdev = to_scsi_device(dev);
 583         const char *name = scsi_device_state_name(sdev->sdev_state);
 584
 585         if (!name)
 586                 return -EINVAL;
 587
 588         return snprintf(buf, 20, "%s\n", name);
 589 }
 590
 591 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 592
 593 static ssize_t
 594 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 595                       char *buf)
 596 {
 597         struct scsi_device *sdev = to_scsi_device(dev);
 598         const char *name = "none";
 599
 600         if (sdev->ordered_tags)
 601                 name = "ordered";
 602         else if (sdev->simple_tags)
 603                 name = "simple";
 604
 605         return snprintf(buf, 20, "%s\n", name);
 606 }
 607
 608 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 609
 610 static ssize_t
 611 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 612 {
 613         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 614 }
 615
 616 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 617
 618 #define show_sdev_iostat(field)                                         \
 619 static ssize_t                                                          \
 620 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 621                     char *buf)                                          \
 622 {                                                                       \
 623         struct scsi_device *sdev = to_scsi_device(dev);                 \
 624         unsigned long long count = atomic_read(&sdev->field);           \
 625         return snprintf(buf, 20, "0x%llx\n", count);                    \
 626 }                                                                       \
 627 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 628
 629 show_sdev_iostat(iorequest_cnt);
 630 show_sdev_iostat(iodone_cnt);
 631 show_sdev_iostat(ioerr_cnt);
 632
 633 static ssize_t
 634 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 635 {
 636         struct scsi_device *sdev;
 637         sdev = to_scsi_device(dev);
 638         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 639 }
 640 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 641
 642 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 643 static ssize_t                                                          \
 644 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 645                      char *buf)                                         \
 646 {                                                                       \
 647         struct scsi_device *sdev = to_scsi_device(dev);                 \
 648         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 649         return snprintf(buf, 20, "%d\n", val);                          \
 650 }
 651
 652 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 653 static ssize_t                                                          \
 654 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 655                       const char *buf, size_t count)                    \
 656 {                                                                       \
 657         struct scsi_device *sdev = to_scsi_device(dev);                 \
 658         int val = simple_strtoul(buf, NULL, 0);                         \
 659         if (val == 0)                                                   \
 660                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 661         else if (val == 1)                                              \
 662                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 663         else                                                            \
 664                 return -EINVAL;                                         \
 665         return count;                                                   \
 666 }
 667
 668 #define DECLARE_EVT(name, Cap_name)                                     \
 669         DECLARE_EVT_SHOW(name, Cap_name)                                \
 670         DECLARE_EVT_STORE(name, Cap_name)                               \
 671         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 672                            sdev_store_evt_##name);
 673 #define REF_EVT(name) &dev_attr_evt_##name.attr
 674
 675 DECLARE_EVT(media_change, MEDIA_CHANGE)
 676
 677 /* Default template for device attributes.  May NOT be modified */
 678 static struct attribute *scsi_sdev_attrs[] = {
 679         &dev_attr_device_blocked.attr,
 680         &dev_attr_type.attr,
 681         &dev_attr_scsi_level.attr,
 682         &dev_attr_vendor.attr,
 683         &dev_attr_model.attr,
 684         &dev_attr_rev.attr,
 685         &dev_attr_rescan.attr,
 686         &dev_attr_delete.attr,
 687         &dev_attr_state.attr,
 688         &dev_attr_timeout.attr,
 689         &dev_attr_iocounterbits.attr,
 690         &dev_attr_iorequest_cnt.attr,
 691         &dev_attr_iodone_cnt.attr,
 692         &dev_attr_ioerr_cnt.attr,
 693         &dev_attr_modalias.attr,
 694         REF_EVT(media_change),
 695         NULL
 696 };
 697
 698 static struct attribute_group scsi_sdev_attr_group = {
 699         .attrs =        scsi_sdev_attrs,
 700 };
 701
 702 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 703         &scsi_sdev_attr_group,
 704         NULL
 705 };
 706
 707 static ssize_t
 708 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 709                           const char *buf, size_t count)
 710 {
 711         int depth, retval;
 712         struct scsi_device *sdev = to_scsi_device(dev);
 713         struct scsi_host_template *sht = sdev->host->hostt;
 714
 715         if (!sht->change_queue_depth)
 716                 return -EINVAL;
 717
 718         depth = simple_strtoul(buf, NULL, 0);
 719
 720         if (depth < 1)
 721                 return -EINVAL;
 722
 723         retval = sht->change_queue_depth(sdev, depth,
 724                                          SCSI_QDEPTH_DEFAULT);
 725         if (retval < 0)
 726                 return retval;
 727
 728         sdev->max_queue_depth = sdev->queue_depth;
 729
 730         return count;
 731 }
 732
 733 static struct device_attribute sdev_attr_queue_depth_rw =
 734         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 735                sdev_store_queue_depth_rw);
 736
 737 static ssize_t
 738 sdev_show_queue_ramp_up_period(struct device *dev,
 739                                struct device_attribute *attr,
 740                                char *buf)
 741 {
 742         struct scsi_device *sdev;
 743         sdev = to_scsi_device(dev);
 744         return snprintf(buf, 20, "%u\n",
 745                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 746 }
 747
 748 static ssize_t
 749 sdev_store_queue_ramp_up_period(struct device *dev,
 750                                 struct device_attribute *attr,
 751                                 const char *buf, size_t count)
 752 {
 753         struct scsi_device *sdev = to_scsi_device(dev);
 754         unsigned long period;
 755
 756         if (strict_strtoul(buf, 10, &period))
 757                 return -EINVAL;
 758
 759         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 760         return period;
 761 }
 762
 763 static struct device_attribute sdev_attr_queue_ramp_up_period =
 764         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 765                sdev_show_queue_ramp_up_period,
 766                sdev_store_queue_ramp_up_period);
 767
 768 static ssize_t
 769 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 770                          const char *buf, size_t count)
 771 {
 772         struct scsi_device *sdev = to_scsi_device(dev);
 773         struct scsi_host_template *sht = sdev->host->hostt;
 774         int tag_type = 0, retval;
 775         int prev_tag_type = scsi_get_tag_type(sdev);
 776
 777         if (!sdev->tagged_supported || !sht->change_queue_type)
 778                 return -EINVAL;
 779
 780         if (strncmp(buf, "ordered", 7) == 0)
 781                 tag_type = MSG_ORDERED_TAG;
 782         else if (strncmp(buf, "simple", 6) == 0)
 783                 tag_type = MSG_SIMPLE_TAG;
 784         else if (strncmp(buf, "none", 4) != 0)
 785                 return -EINVAL;
 786
 787         if (tag_type == prev_tag_type)
 788                 return count;
 789
 790         retval = sht->change_queue_type(sdev, tag_type);
 791         if (retval < 0)
 792                 return retval;
 793
 794         return count;
 795 }
 796
 797 static int scsi_target_add(struct scsi_target *starget)
 798 {
 799         int error;
 800
 801         if (starget->state != STARGET_CREATED)
 802                 return 0;
 803
 804         error = device_add(&starget->dev);
 805         if (error) {
 806                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 807                 return error;
 808         }
 809         transport_add_device(&starget->dev);
 810         starget->state = STARGET_RUNNING;
 811
 812         pm_runtime_set_active(&starget->dev);
 813         pm_runtime_enable(&starget->dev);
 814         device_enable_async_suspend(&starget->dev);
 815
 816         return 0;
 817 }
 818
 819 static struct device_attribute sdev_attr_queue_type_rw =
 820         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 821                sdev_store_queue_type_rw);
 822
 823 /**
 824  * scsi_sysfs_add_sdev - add scsi device to sysfs
 825  * @sdev:       scsi_device to add
 826  *
 827  * Return value:
 828  *      0 on Success / non-zero on Failure
 829  **/
 830 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 831 {
 832         int error, i;
 833         struct request_queue *rq = sdev->request_queue;
 834         struct scsi_target *starget = sdev->sdev_target;
 835
 836         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 837         if (error)
 838                 return error;
 839
 840         error = scsi_target_add(starget);
 841         if (error)
 842                 return error;
 843
 844         transport_configure_device(&starget->dev);
 845
 846         device_enable_async_suspend(&sdev->sdev_gendev);
 847         scsi_autopm_get_target(starget);
 848         pm_runtime_set_active(&sdev->sdev_gendev);
 849         pm_runtime_forbid(&sdev->sdev_gendev);
 850         pm_runtime_enable(&sdev->sdev_gendev);
 851         scsi_autopm_put_target(starget);
 852
 853         /* The following call will keep sdev active indefinitely, until
 854          * its driver does a corresponding scsi_autopm_pm_device().  Only
 855          * drivers supporting autosuspend will do this.
 856          */
 857         scsi_autopm_get_device(sdev);
 858
 859         error = device_add(&sdev->sdev_gendev);
 860         if (error) {
 861                 sdev_printk(KERN_INFO, sdev,
 862                                 "failed to add device: %d\n", error);
 863                 return error;
 864         }
 865         device_enable_async_suspend(&sdev->sdev_dev);
 866         error = device_add(&sdev->sdev_dev);
 867         if (error) {
 868                 sdev_printk(KERN_INFO, sdev,
 869                                 "failed to add class device: %d\n", error);
 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
 935         /* cause the request function to reject all I/O requests */
 936         sdev->request_queue->queuedata = NULL;
 937
 938         /* Freeing the queue signals to block that we're done */
 939         scsi_free_queue(sdev->request_queue);
 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, }, }, }, };