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/init.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/device.h>
  13
  14 #include <scsi/scsi.h>
  15 #include <scsi/scsi_device.h>
  16 #include <scsi/scsi_host.h>
  17 #include <scsi/scsi_tcq.h>
  18 #include <scsi/scsi_transport.h>
  19 #include <scsi/scsi_driver.h>
  20
  21 #include "scsi_priv.h"
  22 #include "scsi_logging.h"
  23
  24 static const struct {
  25         enum scsi_device_state  value;
  26         char                    *name;
  27 } sdev_states[] = {
  28         { SDEV_CREATED, "created" },
  29         { SDEV_RUNNING, "running" },
  30         { SDEV_CANCEL, "cancel" },
  31         { SDEV_DEL, "deleted" },
  32         { SDEV_QUIESCE, "quiesce" },
  33         { SDEV_OFFLINE, "offline" },
  34         { SDEV_BLOCK,   "blocked" },
  35 };
  36
  37 const char *scsi_device_state_name(enum scsi_device_state state)
  38 {
  39         int i;
  40         char *name = NULL;
  41
  42         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  43                 if (sdev_states[i].value == state) {
  44                         name = sdev_states[i].name;
  45                         break;
  46                 }
  47         }
  48         return name;
  49 }
  50
  51 static const struct {
  52         enum scsi_host_state    value;
  53         char                    *name;
  54 } shost_states[] = {
  55         { SHOST_CREATED, "created" },
  56         { SHOST_RUNNING, "running" },
  57         { SHOST_CANCEL, "cancel" },
  58         { SHOST_DEL, "deleted" },
  59         { SHOST_RECOVERY, "recovery" },
  60         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  61         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  62 };
  63 const char *scsi_host_state_name(enum scsi_host_state state)
  64 {
  65         int i;
  66         char *name = NULL;
  67
  68         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  69                 if (shost_states[i].value == state) {
  70                         name = shost_states[i].name;
  71                         break;
  72                 }
  73         }
  74         return name;
  75 }
  76
  77 static int check_set(unsigned int *val, char *src)
  78 {
  79         char *last;
  80
  81         if (strncmp(src, "-", 20) == 0) {
  82                 *val = SCAN_WILD_CARD;
  83         } else {
  84                 /*
  85                  * Doesn't check for int overflow
  86                  */
  87                 *val = simple_strtoul(src, &last, 0);
  88                 if (*last != '\0')
  89                         return 1;
  90         }
  91         return 0;
  92 }
  93
  94 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  95 {
  96         char s1[15], s2[15], s3[15], junk;
  97         unsigned int channel, id, lun;
  98         int res;
  99
 100         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 101         if (res != 3)
 102                 return -EINVAL;
 103         if (check_set(&channel, s1))
 104                 return -EINVAL;
 105         if (check_set(&id, s2))
 106                 return -EINVAL;
 107         if (check_set(&lun, s3))
 108                 return -EINVAL;
 109         if (shost->transportt->user_scan)
 110                 res = shost->transportt->user_scan(shost, channel, id, lun);
 111         else
 112                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 113         return res;
 114 }
 115
 116 /*
 117  * shost_show_function: macro to create an attr function that can be used to
 118  * show a non-bit field.
 119  */
 120 #define shost_show_function(name, field, format_string)                 \
 121 static ssize_t                                                          \
 122 show_##name (struct device *dev, struct device_attribute *attr,         \
 123              char *buf)                                                 \
 124 {                                                                       \
 125         struct Scsi_Host *shost = class_to_shost(dev);                  \
 126         return snprintf (buf, 20, format_string, shost->field);         \
 127 }
 128
 129 /*
 130  * shost_rd_attr: macro to create a function and attribute variable for a
 131  * read only field.
 132  */
 133 #define shost_rd_attr2(name, field, format_string)                      \
 134         shost_show_function(name, field, format_string)                 \
 135 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 136
 137 #define shost_rd_attr(field, format_string) \
 138 shost_rd_attr2(field, field, format_string)
 139
 140 /*
 141  * Create the actual show/store functions and data structures.
 142  */
 143
 144 static ssize_t
 145 store_scan(struct device *dev, struct device_attribute *attr,
 146            const char *buf, size_t count)
 147 {
 148         struct Scsi_Host *shost = class_to_shost(dev);
 149         int res;
 150
 151         res = scsi_scan(shost, buf);
 152         if (res == 0)
 153                 res = count;
 154         return res;
 155 };
 156 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 157
 158 static ssize_t
 159 store_shost_state(struct device *dev, struct device_attribute *attr,
 160                   const char *buf, size_t count)
 161 {
 162         int i;
 163         struct Scsi_Host *shost = class_to_shost(dev);
 164         enum scsi_host_state state = 0;
 165
 166         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 167                 const int len = strlen(shost_states[i].name);
 168                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 169                    buf[len] == '\n') {
 170                         state = shost_states[i].value;
 171                         break;
 172                 }
 173         }
 174         if (!state)
 175                 return -EINVAL;
 176
 177         if (scsi_host_set_state(shost, state))
 178                 return -EINVAL;
 179         return count;
 180 }
 181
 182 static ssize_t
 183 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 184 {
 185         struct Scsi_Host *shost = class_to_shost(dev);
 186         const char *name = scsi_host_state_name(shost->shost_state);
 187
 188         if (!name)
 189                 return -EINVAL;
 190
 191         return snprintf(buf, 20, "%s\n", name);
 192 }
 193
 194 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 195 struct device_attribute dev_attr_hstate =
 196         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 197
 198 static ssize_t
 199 show_shost_mode(unsigned int mode, char *buf)
 200 {
 201         ssize_t len = 0;
 202
 203         if (mode & MODE_INITIATOR)
 204                 len = sprintf(buf, "%s", "Initiator");
 205
 206         if (mode & MODE_TARGET)
 207                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 208
 209         len += sprintf(buf + len, "\n");
 210
 211         return len;
 212 }
 213
 214 static ssize_t
 215 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 216                           char *buf)
 217 {
 218         struct Scsi_Host *shost = class_to_shost(dev);
 219         unsigned int supported_mode = shost->hostt->supported_mode;
 220
 221         if (supported_mode == MODE_UNKNOWN)
 222                 /* by default this should be initiator */
 223                 supported_mode = MODE_INITIATOR;
 224
 225         return show_shost_mode(supported_mode, buf);
 226 }
 227
 228 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 229
 230 static ssize_t
 231 show_shost_active_mode(struct device *dev,
 232                        struct device_attribute *attr, char *buf)
 233 {
 234         struct Scsi_Host *shost = class_to_shost(dev);
 235
 236         if (shost->active_mode == MODE_UNKNOWN)
 237                 return snprintf(buf, 20, "unknown\n");
 238         else
 239                 return show_shost_mode(shost->active_mode, buf);
 240 }
 241
 242 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 243
 244 shost_rd_attr(unique_id, "%u\n");
 245 shost_rd_attr(host_busy, "%hu\n");
 246 shost_rd_attr(cmd_per_lun, "%hd\n");
 247 shost_rd_attr(can_queue, "%hd\n");
 248 shost_rd_attr(sg_tablesize, "%hu\n");
 249 shost_rd_attr(unchecked_isa_dma, "%d\n");
 250 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 251
 252 static struct device_attribute *scsi_sysfs_shost_attrs[] = {
 253         &dev_attr_unique_id,
 254         &dev_attr_host_busy,
 255         &dev_attr_cmd_per_lun,
 256         &dev_attr_can_queue,
 257         &dev_attr_sg_tablesize,
 258         &dev_attr_unchecked_isa_dma,
 259         &dev_attr_proc_name,
 260         &dev_attr_scan,
 261         &dev_attr_hstate,
 262         &dev_attr_supported_mode,
 263         &dev_attr_active_mode,
 264         NULL
 265 };
 266
 267 static void scsi_device_cls_release(struct device *class_dev)
 268 {
 269         struct scsi_device *sdev;
 270
 271         sdev = class_to_sdev(class_dev);
 272         put_device(&sdev->sdev_gendev);
 273 }
 274
 275 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 276 {
 277         struct scsi_device *sdev;
 278         struct device *parent;
 279         struct scsi_target *starget;
 280         struct list_head *this, *tmp;
 281         unsigned long flags;
 282
 283         sdev = container_of(work, struct scsi_device, ew.work);
 284
 285         parent = sdev->sdev_gendev.parent;
 286         starget = to_scsi_target(parent);
 287
 288         spin_lock_irqsave(sdev->host->host_lock, flags);
 289         starget->reap_ref++;
 290         list_del(&sdev->siblings);
 291         list_del(&sdev->same_target_siblings);
 292         list_del(&sdev->starved_entry);
 293         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 294
 295         cancel_work_sync(&sdev->event_work);
 296
 297         list_for_each_safe(this, tmp, &sdev->event_list) {
 298                 struct scsi_event *evt;
 299
 300                 evt = list_entry(this, struct scsi_event, node);
 301                 list_del(&evt->node);
 302                 kfree(evt);
 303         }
 304
 305         if (sdev->request_queue) {
 306                 sdev->request_queue->queuedata = NULL;
 307                 /* user context needed to free queue */
 308                 scsi_free_queue(sdev->request_queue);
 309                 /* temporary expedient, try to catch use of queue lock
 310                  * after free of sdev */
 311                 sdev->request_queue = NULL;
 312         }
 313
 314         scsi_target_reap(scsi_target(sdev));
 315
 316         kfree(sdev->inquiry);
 317         kfree(sdev);
 318
 319         if (parent)
 320                 put_device(parent);
 321 }
 322
 323 static void scsi_device_dev_release(struct device *dev)
 324 {
 325         struct scsi_device *sdp = to_scsi_device(dev);
 326         execute_in_process_context(scsi_device_dev_release_usercontext,
 327                                    &sdp->ew);
 328 }
 329
 330 static struct class sdev_class = {
 331         .name           = "scsi_device",
 332         .dev_release    = scsi_device_cls_release,
 333 };
 334
 335 /* all probing is done in the individual ->probe routines */
 336 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 337 {
 338         struct scsi_device *sdp = to_scsi_device(dev);
 339         if (sdp->no_uld_attach)
 340                 return 0;
 341         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 342 }
 343
 344 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 345 {
 346         struct scsi_device *sdev = to_scsi_device(dev);
 347
 348         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 349         return 0;
 350 }
 351
 352 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 353 {
 354         struct device_driver *drv = dev->driver;
 355         struct scsi_device *sdev = to_scsi_device(dev);
 356         int err;
 357
 358         err = scsi_device_quiesce(sdev);
 359         if (err)
 360                 return err;
 361
 362         if (drv && drv->suspend) {
 363                 err = drv->suspend(dev, state);
 364                 if (err)
 365                         return err;
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int scsi_bus_resume(struct device * dev)
 372 {
 373         struct device_driver *drv = dev->driver;
 374         struct scsi_device *sdev = to_scsi_device(dev);
 375         int err = 0;
 376
 377         if (drv && drv->resume)
 378                 err = drv->resume(dev);
 379
 380         scsi_device_resume(sdev);
 381
 382         return err;
 383 }
 384
 385 static int scsi_bus_remove(struct device *dev)
 386 {
 387         struct device_driver *drv = dev->driver;
 388         struct scsi_device *sdev = to_scsi_device(dev);
 389         int err = 0;
 390
 391         /* reset the prep_fn back to the default since the
 392          * driver may have altered it and it's being removed */
 393         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
 394
 395         if (drv && drv->remove)
 396                 err = drv->remove(dev);
 397
 398         return 0;
 399 }
 400
 401 struct bus_type scsi_bus_type = {
 402         .name           = "scsi",
 403         .match          = scsi_bus_match,
 404         .uevent         = scsi_bus_uevent,
 405         .suspend        = scsi_bus_suspend,
 406         .resume         = scsi_bus_resume,
 407         .remove         = scsi_bus_remove,
 408 };
 409
 410 int scsi_sysfs_register(void)
 411 {
 412         int error;
 413
 414         error = bus_register(&scsi_bus_type);
 415         if (!error) {
 416                 error = class_register(&sdev_class);
 417                 if (error)
 418                         bus_unregister(&scsi_bus_type);
 419         }
 420
 421         return error;
 422 }
 423
 424 void scsi_sysfs_unregister(void)
 425 {
 426         class_unregister(&sdev_class);
 427         bus_unregister(&scsi_bus_type);
 428 }
 429
 430 /*
 431  * sdev_show_function: macro to create an attr function that can be used to
 432  * show a non-bit field.
 433  */
 434 #define sdev_show_function(field, format_string)                                \
 435 static ssize_t                                                          \
 436 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 437                    char *buf)                                           \
 438 {                                                                       \
 439         struct scsi_device *sdev;                                       \
 440         sdev = to_scsi_device(dev);                                     \
 441         return snprintf (buf, 20, format_string, sdev->field);          \
 442 }                                                                       \
 443
 444 /*
 445  * sdev_rd_attr: macro to create a function and attribute variable for a
 446  * read only field.
 447  */
 448 #define sdev_rd_attr(field, format_string)                              \
 449         sdev_show_function(field, format_string)                        \
 450 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 451
 452
 453 /*
 454  * sdev_rd_attr: create a function and attribute variable for a
 455  * read/write field.
 456  */
 457 #define sdev_rw_attr(field, format_string)                              \
 458         sdev_show_function(field, format_string)                                \
 459                                                                         \
 460 static ssize_t                                                          \
 461 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 462                     const char *buf, size_t count)                      \
 463 {                                                                       \
 464         struct scsi_device *sdev;                                       \
 465         sdev = to_scsi_device(dev);                                     \
 466         snscanf (buf, 20, format_string, &sdev->field);                 \
 467         return count;                                                   \
 468 }                                                                       \
 469 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 470
 471 /* Currently we don't export bit fields, but we might in future,
 472  * so leave this code in */
 473 #if 0
 474 /*
 475  * sdev_rd_attr: create a function and attribute variable for a
 476  * read/write bit field.
 477  */
 478 #define sdev_rw_attr_bit(field)                                         \
 479         sdev_show_function(field, "%d\n")                                       \
 480                                                                         \
 481 static ssize_t                                                          \
 482 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 483                     const char *buf, size_t count)                      \
 484 {                                                                       \
 485         int ret;                                                        \
 486         struct scsi_device *sdev;                                       \
 487         ret = scsi_sdev_check_buf_bit(buf);                             \
 488         if (ret >= 0)   {                                               \
 489                 sdev = to_scsi_device(dev);                             \
 490                 sdev->field = ret;                                      \
 491                 ret = count;                                            \
 492         }                                                               \
 493         return ret;                                                     \
 494 }                                                                       \
 495 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 496
 497 /*
 498  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 499  * else return -EINVAL.
 500  */
 501 static int scsi_sdev_check_buf_bit(const char *buf)
 502 {
 503         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 504                 if (buf[0] == '1')
 505                         return 1;
 506                 else if (buf[0] == '0')
 507                         return 0;
 508                 else
 509                         return -EINVAL;
 510         } else
 511                 return -EINVAL;
 512 }
 513 #endif
 514 /*
 515  * Create the actual show/store functions and data structures.
 516  */
 517 sdev_rd_attr (device_blocked, "%d\n");
 518 sdev_rd_attr (queue_depth, "%d\n");
 519 sdev_rd_attr (type, "%d\n");
 520 sdev_rd_attr (scsi_level, "%d\n");
 521 sdev_rd_attr (vendor, "%.8s\n");
 522 sdev_rd_attr (model, "%.16s\n");
 523 sdev_rd_attr (rev, "%.4s\n");
 524
 525 static ssize_t
 526 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 527 {
 528         struct scsi_device *sdev;
 529         sdev = to_scsi_device(dev);
 530         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 531 }
 532
 533 static ssize_t
 534 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 535                     const char *buf, size_t count)
 536 {
 537         struct scsi_device *sdev;
 538         int timeout;
 539         sdev = to_scsi_device(dev);
 540         sscanf (buf, "%d\n", &timeout);
 541         sdev->timeout = timeout * HZ;
 542         return count;
 543 }
 544 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 545
 546 static ssize_t
 547 store_rescan_field (struct device *dev, struct device_attribute *attr,
 548                     const char *buf, size_t count)
 549 {
 550         scsi_rescan_device(dev);
 551         return count;
 552 }
 553 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 554
 555 static void sdev_store_delete_callback(struct device *dev)
 556 {
 557         scsi_remove_device(to_scsi_device(dev));
 558 }
 559
 560 static ssize_t
 561 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 562                   const char *buf, size_t count)
 563 {
 564         int rc;
 565
 566         /* An attribute cannot be unregistered by one of its own methods,
 567          * so we have to use this roundabout approach.
 568          */
 569         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 570         if (rc)
 571                 count = rc;
 572         return count;
 573 };
 574 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 575
 576 static ssize_t
 577 store_state_field(struct device *dev, struct device_attribute *attr,
 578                   const char *buf, size_t count)
 579 {
 580         int i;
 581         struct scsi_device *sdev = to_scsi_device(dev);
 582         enum scsi_device_state state = 0;
 583
 584         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 585                 const int len = strlen(sdev_states[i].name);
 586                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 587                    buf[len] == '\n') {
 588                         state = sdev_states[i].value;
 589                         break;
 590                 }
 591         }
 592         if (!state)
 593                 return -EINVAL;
 594
 595         if (scsi_device_set_state(sdev, state))
 596                 return -EINVAL;
 597         return count;
 598 }
 599
 600 static ssize_t
 601 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 602 {
 603         struct scsi_device *sdev = to_scsi_device(dev);
 604         const char *name = scsi_device_state_name(sdev->sdev_state);
 605
 606         if (!name)
 607                 return -EINVAL;
 608
 609         return snprintf(buf, 20, "%s\n", name);
 610 }
 611
 612 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 613
 614 static ssize_t
 615 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 616                       char *buf)
 617 {
 618         struct scsi_device *sdev = to_scsi_device(dev);
 619         const char *name = "none";
 620
 621         if (sdev->ordered_tags)
 622                 name = "ordered";
 623         else if (sdev->simple_tags)
 624                 name = "simple";
 625
 626         return snprintf(buf, 20, "%s\n", name);
 627 }
 628
 629 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 630
 631 static ssize_t
 632 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 633 {
 634         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 635 }
 636
 637 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 638
 639 #define show_sdev_iostat(field)                                         \
 640 static ssize_t                                                          \
 641 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 642                     char *buf)                                          \
 643 {                                                                       \
 644         struct scsi_device *sdev = to_scsi_device(dev);                 \
 645         unsigned long long count = atomic_read(&sdev->field);           \
 646         return snprintf(buf, 20, "0x%llx\n", count);                    \
 647 }                                                                       \
 648 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 649
 650 show_sdev_iostat(iorequest_cnt);
 651 show_sdev_iostat(iodone_cnt);
 652 show_sdev_iostat(ioerr_cnt);
 653
 654 static ssize_t
 655 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 656 {
 657         struct scsi_device *sdev;
 658         sdev = to_scsi_device(dev);
 659         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 660 }
 661 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 662
 663 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 664 static ssize_t                                                          \
 665 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 666                      char *buf)                                         \
 667 {                                                                       \
 668         struct scsi_device *sdev = to_scsi_device(dev);                 \
 669         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 670         return snprintf(buf, 20, "%d\n", val);                          \
 671 }
 672
 673 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 674 static ssize_t                                                          \
 675 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 676                       const char *buf, size_t count)                    \
 677 {                                                                       \
 678         struct scsi_device *sdev = to_scsi_device(dev);                 \
 679         int val = simple_strtoul(buf, NULL, 0);                         \
 680         if (val == 0)                                                   \
 681                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 682         else if (val == 1)                                              \
 683                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 684         else                                                            \
 685                 return -EINVAL;                                         \
 686         return count;                                                   \
 687 }
 688
 689 #define DECLARE_EVT(name, Cap_name)                                     \
 690         DECLARE_EVT_SHOW(name, Cap_name)                                \
 691         DECLARE_EVT_STORE(name, Cap_name)                               \
 692         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 693                            sdev_store_evt_##name);
 694 #define REF_EVT(name) &dev_attr_evt_##name.attr
 695
 696 DECLARE_EVT(media_change, MEDIA_CHANGE)
 697
 698 /* Default template for device attributes.  May NOT be modified */
 699 static struct attribute *scsi_sdev_attrs[] = {
 700         &dev_attr_device_blocked.attr,
 701         &dev_attr_type.attr,
 702         &dev_attr_scsi_level.attr,
 703         &dev_attr_vendor.attr,
 704         &dev_attr_model.attr,
 705         &dev_attr_rev.attr,
 706         &dev_attr_rescan.attr,
 707         &dev_attr_delete.attr,
 708         &dev_attr_state.attr,
 709         &dev_attr_timeout.attr,
 710         &dev_attr_iocounterbits.attr,
 711         &dev_attr_iorequest_cnt.attr,
 712         &dev_attr_iodone_cnt.attr,
 713         &dev_attr_ioerr_cnt.attr,
 714         &dev_attr_modalias.attr,
 715         REF_EVT(media_change),
 716         NULL
 717 };
 718
 719 static struct attribute_group scsi_sdev_attr_group = {
 720         .attrs =        scsi_sdev_attrs,
 721 };
 722
 723 static struct attribute_group *scsi_sdev_attr_groups[] = {
 724         &scsi_sdev_attr_group,
 725         NULL
 726 };
 727
 728 static ssize_t
 729 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 730                           const char *buf, size_t count)
 731 {
 732         int depth, retval;
 733         struct scsi_device *sdev = to_scsi_device(dev);
 734         struct scsi_host_template *sht = sdev->host->hostt;
 735
 736         if (!sht->change_queue_depth)
 737                 return -EINVAL;
 738
 739         depth = simple_strtoul(buf, NULL, 0);
 740
 741         if (depth < 1)
 742                 return -EINVAL;
 743
 744         retval = sht->change_queue_depth(sdev, depth);
 745         if (retval < 0)
 746                 return retval;
 747
 748         return count;
 749 }
 750
 751 static struct device_attribute sdev_attr_queue_depth_rw =
 752         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 753                sdev_store_queue_depth_rw);
 754
 755 static ssize_t
 756 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 757                          const char *buf, size_t count)
 758 {
 759         struct scsi_device *sdev = to_scsi_device(dev);
 760         struct scsi_host_template *sht = sdev->host->hostt;
 761         int tag_type = 0, retval;
 762         int prev_tag_type = scsi_get_tag_type(sdev);
 763
 764         if (!sdev->tagged_supported || !sht->change_queue_type)
 765                 return -EINVAL;
 766
 767         if (strncmp(buf, "ordered", 7) == 0)
 768                 tag_type = MSG_ORDERED_TAG;
 769         else if (strncmp(buf, "simple", 6) == 0)
 770                 tag_type = MSG_SIMPLE_TAG;
 771         else if (strncmp(buf, "none", 4) != 0)
 772                 return -EINVAL;
 773
 774         if (tag_type == prev_tag_type)
 775                 return count;
 776
 777         retval = sht->change_queue_type(sdev, tag_type);
 778         if (retval < 0)
 779                 return retval;
 780
 781         return count;
 782 }
 783
 784 static struct device_attribute sdev_attr_queue_type_rw =
 785         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 786                sdev_store_queue_type_rw);
 787
 788 /**
 789  * scsi_sysfs_add_sdev - add scsi device to sysfs
 790  * @sdev:       scsi_device to add
 791  *
 792  * Return value:
 793  *      0 on Success / non-zero on Failure
 794  **/
 795 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 796 {
 797         int error, i;
 798         struct request_queue *rq = sdev->request_queue;
 799
 800         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 801                 return error;
 802
 803         error = device_add(&sdev->sdev_gendev);
 804         if (error) {
 805                 put_device(sdev->sdev_gendev.parent);
 806                 printk(KERN_INFO "error 1\n");
 807                 return error;
 808         }
 809         error = device_add(&sdev->sdev_dev);
 810         if (error) {
 811                 printk(KERN_INFO "error 2\n");
 812                 goto clean_device;
 813         }
 814
 815         /* take a reference for the sdev_dev; this is
 816          * released by the sdev_class .release */
 817         get_device(&sdev->sdev_gendev);
 818
 819         /* create queue files, which may be writable, depending on the host */
 820         if (sdev->host->hostt->change_queue_depth)
 821                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 822         else
 823                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 824         if (error) {
 825                 __scsi_remove_device(sdev);
 826                 goto out;
 827         }
 828         if (sdev->host->hostt->change_queue_type)
 829                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 830         else
 831                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 832         if (error) {
 833                 __scsi_remove_device(sdev);
 834                 goto out;
 835         }
 836
 837         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
 838
 839         if (error)
 840                 sdev_printk(KERN_INFO, sdev,
 841                             "Failed to register bsg queue, errno=%d\n", error);
 842
 843         /* we're treating error on bsg register as non-fatal, so pretend
 844          * nothing went wrong */
 845         error = 0;
 846
 847         /* add additional host specific attributes */
 848         if (sdev->host->hostt->sdev_attrs) {
 849                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 850                         error = device_create_file(&sdev->sdev_gendev,
 851                                         sdev->host->hostt->sdev_attrs[i]);
 852                         if (error) {
 853                                 __scsi_remove_device(sdev);
 854                                 goto out;
 855                         }
 856                 }
 857         }
 858
 859         transport_add_device(&sdev->sdev_gendev);
 860  out:
 861         return error;
 862
 863  clean_device:
 864         scsi_device_set_state(sdev, SDEV_CANCEL);
 865
 866         device_del(&sdev->sdev_gendev);
 867         transport_destroy_device(&sdev->sdev_gendev);
 868         put_device(&sdev->sdev_gendev);
 869
 870         return error;
 871 }
 872
 873 void __scsi_remove_device(struct scsi_device *sdev)
 874 {
 875         struct device *dev = &sdev->sdev_gendev;
 876
 877         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 878                 return;
 879
 880         bsg_unregister_queue(sdev->request_queue);
 881         device_unregister(&sdev->sdev_dev);
 882         transport_remove_device(dev);
 883         device_del(dev);
 884         scsi_device_set_state(sdev, SDEV_DEL);
 885         if (sdev->host->hostt->slave_destroy)
 886                 sdev->host->hostt->slave_destroy(sdev);
 887         transport_destroy_device(dev);
 888         put_device(dev);
 889 }
 890
 891 /**
 892  * scsi_remove_device - unregister a device from the scsi bus
 893  * @sdev:       scsi_device to unregister
 894  **/
 895 void scsi_remove_device(struct scsi_device *sdev)
 896 {
 897         struct Scsi_Host *shost = sdev->host;
 898
 899         mutex_lock(&shost->scan_mutex);
 900         __scsi_remove_device(sdev);
 901         mutex_unlock(&shost->scan_mutex);
 902 }
 903 EXPORT_SYMBOL(scsi_remove_device);
 904
 905 static void __scsi_remove_target(struct scsi_target *starget)
 906 {
 907         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 908         unsigned long flags;
 909         struct scsi_device *sdev;
 910
 911         spin_lock_irqsave(shost->host_lock, flags);
 912         starget->reap_ref++;
 913  restart:
 914         list_for_each_entry(sdev, &shost->__devices, siblings) {
 915                 if (sdev->channel != starget->channel ||
 916                     sdev->id != starget->id ||
 917                     sdev->sdev_state == SDEV_DEL)
 918                         continue;
 919                 spin_unlock_irqrestore(shost->host_lock, flags);
 920                 scsi_remove_device(sdev);
 921                 spin_lock_irqsave(shost->host_lock, flags);
 922                 goto restart;
 923         }
 924         spin_unlock_irqrestore(shost->host_lock, flags);
 925         scsi_target_reap(starget);
 926 }
 927
 928 static int __remove_child (struct device * dev, void * data)
 929 {
 930         if (scsi_is_target_device(dev))
 931                 __scsi_remove_target(to_scsi_target(dev));
 932         return 0;
 933 }
 934
 935 /**
 936  * scsi_remove_target - try to remove a target and all its devices
 937  * @dev: generic starget or parent of generic stargets to be removed
 938  *
 939  * Note: This is slightly racy.  It is possible that if the user
 940  * requests the addition of another device then the target won't be
 941  * removed.
 942  */
 943 void scsi_remove_target(struct device *dev)
 944 {
 945         struct device *rdev;
 946
 947         if (scsi_is_target_device(dev)) {
 948                 __scsi_remove_target(to_scsi_target(dev));
 949                 return;
 950         }
 951
 952         rdev = get_device(dev);
 953         device_for_each_child(dev, NULL, __remove_child);
 954         put_device(rdev);
 955 }
 956 EXPORT_SYMBOL(scsi_remove_target);
 957
 958 int scsi_register_driver(struct device_driver *drv)
 959 {
 960         drv->bus = &scsi_bus_type;
 961
 962         return driver_register(drv);
 963 }
 964 EXPORT_SYMBOL(scsi_register_driver);
 965
 966 int scsi_register_interface(struct class_interface *intf)
 967 {
 968         intf->class = &sdev_class;
 969
 970         return class_interface_register(intf);
 971 }
 972 EXPORT_SYMBOL(scsi_register_interface);
 973
 974
 975 static struct device_attribute *class_attr_overridden(
 976                 struct device_attribute **attrs,
 977                 struct device_attribute *attr)
 978 {
 979         int i;
 980
 981         if (!attrs)
 982                 return NULL;
 983         for (i = 0; attrs[i]; i++)
 984                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 985                         return attrs[i];
 986         return NULL;
 987 }
 988
 989 static int class_attr_add(struct device *classdev,
 990                 struct device_attribute *attr)
 991 {
 992         struct device_attribute *base_attr;
 993
 994         /*
 995          * Spare the caller from having to copy things it's not interested in.
 996          */
 997         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 998         if (base_attr) {
 999                 /* extend permissions */
1000                 attr->attr.mode |= base_attr->attr.mode;
1001
1002                 /* override null show/store with default */
1003                 if (!attr->show)
1004                         attr->show = base_attr->show;
1005                 if (!attr->store)
1006                         attr->store = base_attr->store;
1007         }
1008
1009         return device_create_file(classdev, attr);
1010 }
1011
1012 /**
1013  * scsi_sysfs_add_host - add scsi host to subsystem
1014  * @shost:     scsi host struct to add to subsystem
1015  * @dev:       parent struct device pointer
1016  **/
1017 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1018 {
1019         int error, i;
1020
1021         if (shost->hostt->shost_attrs) {
1022                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1023                         error = class_attr_add(&shost->shost_dev,
1024                                         shost->hostt->shost_attrs[i]);
1025                         if (error)
1026                                 return error;
1027                 }
1028         }
1029
1030         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
1031                 if (!class_attr_overridden(shost->hostt->shost_attrs,
1032                                         scsi_sysfs_shost_attrs[i])) {
1033                         error = device_create_file(&shost->shost_dev,
1034                                         scsi_sysfs_shost_attrs[i]);
1035                         if (error)
1036                                 return error;
1037                 }
1038         }
1039
1040         transport_register_device(&shost->shost_gendev);
1041         transport_configure_device(&shost->shost_gendev);
1042         return 0;
1043 }
1044
1045 static struct device_type scsi_dev_type = {
1046         .name =         "scsi_device",
1047         .release =      scsi_device_dev_release,
1048         .groups =       scsi_sdev_attr_groups,
1049 };
1050
1051 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1052 {
1053         unsigned long flags;
1054         struct Scsi_Host *shost = sdev->host;
1055         struct scsi_target  *starget = sdev->sdev_target;
1056
1057         device_initialize(&sdev->sdev_gendev);
1058         sdev->sdev_gendev.bus = &scsi_bus_type;
1059         sdev->sdev_gendev.type = &scsi_dev_type;
1060         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1061                 sdev->host->host_no, sdev->channel, sdev->id,
1062                 sdev->lun);
1063
1064         device_initialize(&sdev->sdev_dev);
1065         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1066         sdev->sdev_dev.class = &sdev_class;
1067         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1068                  "%d:%d:%d:%d", sdev->host->host_no,
1069                  sdev->channel, sdev->id, sdev->lun);
1070         sdev->scsi_level = starget->scsi_level;
1071         transport_setup_device(&sdev->sdev_gendev);
1072         spin_lock_irqsave(shost->host_lock, flags);
1073         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1074         list_add_tail(&sdev->siblings, &shost->__devices);
1075         spin_unlock_irqrestore(shost->host_lock, flags);
1076 }
1077
1078 int scsi_is_sdev_device(const struct device *dev)
1079 {
1080         return dev->type == &scsi_dev_type;
1081 }
1082 EXPORT_SYMBOL(scsi_is_sdev_device);
1083
1084 /* A blank transport template that is used in drivers that don't
1085  * yet implement Transport Attributes */
1086 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };