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