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_TRANSPORT_OFFLINE, "transport-offline" },
  39         { SDEV_BLOCK,   "blocked" },
  40         { SDEV_CREATED_BLOCK, "created-blocked" },
  41 };
  42
  43 const char *scsi_device_state_name(enum scsi_device_state state)
  44 {
  45         int i;
  46         char *name = NULL;
  47
  48         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  49                 if (sdev_states[i].value == state) {
  50                         name = sdev_states[i].name;
  51                         break;
  52                 }
  53         }
  54         return name;
  55 }
  56
  57 static const struct {
  58         enum scsi_host_state    value;
  59         char                    *name;
  60 } shost_states[] = {
  61         { SHOST_CREATED, "created" },
  62         { SHOST_RUNNING, "running" },
  63         { SHOST_CANCEL, "cancel" },
  64         { SHOST_DEL, "deleted" },
  65         { SHOST_RECOVERY, "recovery" },
  66         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  67         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  68 };
  69 const char *scsi_host_state_name(enum scsi_host_state state)
  70 {
  71         int i;
  72         char *name = NULL;
  73
  74         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  75                 if (shost_states[i].value == state) {
  76                         name = shost_states[i].name;
  77                         break;
  78                 }
  79         }
  80         return name;
  81 }
  82
  83 static int check_set(unsigned int *val, char *src)
  84 {
  85         char *last;
  86
  87         if (strncmp(src, "-", 20) == 0) {
  88                 *val = SCAN_WILD_CARD;
  89         } else {
  90                 /*
  91                  * Doesn't check for int overflow
  92                  */
  93                 *val = simple_strtoul(src, &last, 0);
  94                 if (*last != '\0')
  95                         return 1;
  96         }
  97         return 0;
  98 }
  99
 100 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 101 {
 102         char s1[15], s2[15], s3[15], junk;
 103         unsigned int channel, id, lun;
 104         int res;
 105
 106         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 107         if (res != 3)
 108                 return -EINVAL;
 109         if (check_set(&channel, s1))
 110                 return -EINVAL;
 111         if (check_set(&id, s2))
 112                 return -EINVAL;
 113         if (check_set(&lun, s3))
 114                 return -EINVAL;
 115         if (shost->transportt->user_scan)
 116                 res = shost->transportt->user_scan(shost, channel, id, lun);
 117         else
 118                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 119         return res;
 120 }
 121
 122 /*
 123  * shost_show_function: macro to create an attr function that can be used to
 124  * show a non-bit field.
 125  */
 126 #define shost_show_function(name, field, format_string)                 \
 127 static ssize_t                                                          \
 128 show_##name (struct device *dev, struct device_attribute *attr,         \
 129              char *buf)                                                 \
 130 {                                                                       \
 131         struct Scsi_Host *shost = class_to_shost(dev);                  \
 132         return snprintf (buf, 20, format_string, shost->field);         \
 133 }
 134
 135 /*
 136  * shost_rd_attr: macro to create a function and attribute variable for a
 137  * read only field.
 138  */
 139 #define shost_rd_attr2(name, field, format_string)                      \
 140         shost_show_function(name, field, format_string)                 \
 141 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 142
 143 #define shost_rd_attr(field, format_string) \
 144 shost_rd_attr2(field, field, format_string)
 145
 146 /*
 147  * Create the actual show/store functions and data structures.
 148  */
 149
 150 static ssize_t
 151 store_scan(struct device *dev, struct device_attribute *attr,
 152            const char *buf, size_t count)
 153 {
 154         struct Scsi_Host *shost = class_to_shost(dev);
 155         int res;
 156
 157         res = scsi_scan(shost, buf);
 158         if (res == 0)
 159                 res = count;
 160         return res;
 161 };
 162 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 163
 164 static ssize_t
 165 store_shost_state(struct device *dev, struct device_attribute *attr,
 166                   const char *buf, size_t count)
 167 {
 168         int i;
 169         struct Scsi_Host *shost = class_to_shost(dev);
 170         enum scsi_host_state state = 0;
 171
 172         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 173                 const int len = strlen(shost_states[i].name);
 174                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 175                    buf[len] == '\n') {
 176                         state = shost_states[i].value;
 177                         break;
 178                 }
 179         }
 180         if (!state)
 181                 return -EINVAL;
 182
 183         if (scsi_host_set_state(shost, state))
 184                 return -EINVAL;
 185         return count;
 186 }
 187
 188 static ssize_t
 189 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 190 {
 191         struct Scsi_Host *shost = class_to_shost(dev);
 192         const char *name = scsi_host_state_name(shost->shost_state);
 193
 194         if (!name)
 195                 return -EINVAL;
 196
 197         return snprintf(buf, 20, "%s\n", name);
 198 }
 199
 200 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 201 struct device_attribute dev_attr_hstate =
 202         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 203
 204 static ssize_t
 205 show_shost_mode(unsigned int mode, char *buf)
 206 {
 207         ssize_t len = 0;
 208
 209         if (mode & MODE_INITIATOR)
 210                 len = sprintf(buf, "%s", "Initiator");
 211
 212         if (mode & MODE_TARGET)
 213                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 214
 215         len += sprintf(buf + len, "\n");
 216
 217         return len;
 218 }
 219
 220 static ssize_t
 221 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 222                           char *buf)
 223 {
 224         struct Scsi_Host *shost = class_to_shost(dev);
 225         unsigned int supported_mode = shost->hostt->supported_mode;
 226
 227         if (supported_mode == MODE_UNKNOWN)
 228                 /* by default this should be initiator */
 229                 supported_mode = MODE_INITIATOR;
 230
 231         return show_shost_mode(supported_mode, buf);
 232 }
 233
 234 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 235
 236 static ssize_t
 237 show_shost_active_mode(struct device *dev,
 238                        struct device_attribute *attr, char *buf)
 239 {
 240         struct Scsi_Host *shost = class_to_shost(dev);
 241
 242         if (shost->active_mode == MODE_UNKNOWN)
 243                 return snprintf(buf, 20, "unknown\n");
 244         else
 245                 return show_shost_mode(shost->active_mode, buf);
 246 }
 247
 248 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 249
 250 static int check_reset_type(const char *str)
 251 {
 252         if (sysfs_streq(str, "adapter"))
 253                 return SCSI_ADAPTER_RESET;
 254         else if (sysfs_streq(str, "firmware"))
 255                 return SCSI_FIRMWARE_RESET;
 256         else
 257                 return 0;
 258 }
 259
 260 static ssize_t
 261 store_host_reset(struct device *dev, struct device_attribute *attr,
 262                 const char *buf, size_t count)
 263 {
 264         struct Scsi_Host *shost = class_to_shost(dev);
 265         struct scsi_host_template *sht = shost->hostt;
 266         int ret = -EINVAL;
 267         int type;
 268
 269         type = check_reset_type(buf);
 270         if (!type)
 271                 goto exit_store_host_reset;
 272
 273         if (sht->host_reset)
 274                 ret = sht->host_reset(shost, type);
 275
 276 exit_store_host_reset:
 277         if (ret == 0)
 278                 ret = count;
 279         return ret;
 280 }
 281
 282 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 283
 284 shost_rd_attr(unique_id, "%u\n");
 285 shost_rd_attr(host_busy, "%hu\n");
 286 shost_rd_attr(cmd_per_lun, "%hd\n");
 287 shost_rd_attr(can_queue, "%hd\n");
 288 shost_rd_attr(sg_tablesize, "%hu\n");
 289 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 290 shost_rd_attr(unchecked_isa_dma, "%d\n");
 291 shost_rd_attr(prot_capabilities, "%u\n");
 292 shost_rd_attr(prot_guard_type, "%hd\n");
 293 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 294
 295 static struct attribute *scsi_sysfs_shost_attrs[] = {
 296         &dev_attr_unique_id.attr,
 297         &dev_attr_host_busy.attr,
 298         &dev_attr_cmd_per_lun.attr,
 299         &dev_attr_can_queue.attr,
 300         &dev_attr_sg_tablesize.attr,
 301         &dev_attr_sg_prot_tablesize.attr,
 302         &dev_attr_unchecked_isa_dma.attr,
 303         &dev_attr_proc_name.attr,
 304         &dev_attr_scan.attr,
 305         &dev_attr_hstate.attr,
 306         &dev_attr_supported_mode.attr,
 307         &dev_attr_active_mode.attr,
 308         &dev_attr_prot_capabilities.attr,
 309         &dev_attr_prot_guard_type.attr,
 310         &dev_attr_host_reset.attr,
 311         NULL
 312 };
 313
 314 struct attribute_group scsi_shost_attr_group = {
 315         .attrs =        scsi_sysfs_shost_attrs,
 316 };
 317
 318 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 319         &scsi_shost_attr_group,
 320         NULL
 321 };
 322
 323 static void scsi_device_cls_release(struct device *class_dev)
 324 {
 325         struct scsi_device *sdev;
 326
 327         sdev = class_to_sdev(class_dev);
 328         put_device(&sdev->sdev_gendev);
 329 }
 330
 331 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 332 {
 333         struct scsi_device *sdev;
 334         struct device *parent;
 335         struct scsi_target *starget;
 336         struct list_head *this, *tmp;
 337         unsigned long flags;
 338
 339         sdev = container_of(work, struct scsi_device, ew.work);
 340
 341         parent = sdev->sdev_gendev.parent;
 342         starget = to_scsi_target(parent);
 343
 344         spin_lock_irqsave(sdev->host->host_lock, flags);
 345         starget->reap_ref++;
 346         list_del(&sdev->siblings);
 347         list_del(&sdev->same_target_siblings);
 348         list_del(&sdev->starved_entry);
 349         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 350
 351         cancel_work_sync(&sdev->event_work);
 352
 353         list_for_each_safe(this, tmp, &sdev->event_list) {
 354                 struct scsi_event *evt;
 355
 356                 evt = list_entry(this, struct scsi_event, node);
 357                 list_del(&evt->node);
 358                 kfree(evt);
 359         }
 360
 361         blk_put_queue(sdev->request_queue);
 362         /* NULL queue means the device can't be used */
 363         sdev->request_queue = NULL;
 364
 365         scsi_target_reap(scsi_target(sdev));
 366
 367         kfree(sdev->inquiry);
 368         kfree(sdev);
 369
 370         if (parent)
 371                 put_device(parent);
 372 }
 373
 374 static void scsi_device_dev_release(struct device *dev)
 375 {
 376         struct scsi_device *sdp = to_scsi_device(dev);
 377         execute_in_process_context(scsi_device_dev_release_usercontext,
 378                                    &sdp->ew);
 379 }
 380
 381 static struct class sdev_class = {
 382         .name           = "scsi_device",
 383         .dev_release    = scsi_device_cls_release,
 384 };
 385
 386 /* all probing is done in the individual ->probe routines */
 387 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 388 {
 389         struct scsi_device *sdp;
 390
 391         if (dev->type != &scsi_dev_type)
 392                 return 0;
 393
 394         sdp = to_scsi_device(dev);
 395         if (sdp->no_uld_attach)
 396                 return 0;
 397         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 398 }
 399
 400 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 401 {
 402         struct scsi_device *sdev;
 403
 404         if (dev->type != &scsi_dev_type)
 405                 return 0;
 406
 407         sdev = to_scsi_device(dev);
 408
 409         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 410         return 0;
 411 }
 412
 413 struct bus_type scsi_bus_type = {
 414         .name           = "scsi",
 415         .match          = scsi_bus_match,
 416         .uevent         = scsi_bus_uevent,
 417 #ifdef CONFIG_PM
 418         .pm             = &scsi_bus_pm_ops,
 419 #endif
 420 };
 421 EXPORT_SYMBOL_GPL(scsi_bus_type);
 422
 423 int scsi_sysfs_register(void)
 424 {
 425         int error;
 426
 427         error = bus_register(&scsi_bus_type);
 428         if (!error) {
 429                 error = class_register(&sdev_class);
 430                 if (error)
 431                         bus_unregister(&scsi_bus_type);
 432         }
 433
 434         return error;
 435 }
 436
 437 void scsi_sysfs_unregister(void)
 438 {
 439         class_unregister(&sdev_class);
 440         bus_unregister(&scsi_bus_type);
 441 }
 442
 443 /*
 444  * sdev_show_function: macro to create an attr function that can be used to
 445  * show a non-bit field.
 446  */
 447 #define sdev_show_function(field, format_string)                                \
 448 static ssize_t                                                          \
 449 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 450                    char *buf)                                           \
 451 {                                                                       \
 452         struct scsi_device *sdev;                                       \
 453         sdev = to_scsi_device(dev);                                     \
 454         return snprintf (buf, 20, format_string, sdev->field);          \
 455 }                                                                       \
 456
 457 /*
 458  * sdev_rd_attr: macro to create a function and attribute variable for a
 459  * read only field.
 460  */
 461 #define sdev_rd_attr(field, format_string)                              \
 462         sdev_show_function(field, format_string)                        \
 463 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 464
 465
 466 /*
 467  * sdev_rw_attr: create a function and attribute variable for a
 468  * read/write field.
 469  */
 470 #define sdev_rw_attr(field, format_string)                              \
 471         sdev_show_function(field, format_string)                                \
 472                                                                         \
 473 static ssize_t                                                          \
 474 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 475                     const char *buf, size_t count)                      \
 476 {                                                                       \
 477         struct scsi_device *sdev;                                       \
 478         sdev = to_scsi_device(dev);                                     \
 479         sscanf (buf, format_string, &sdev->field);                      \
 480         return count;                                                   \
 481 }                                                                       \
 482 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 483
 484 /* Currently we don't export bit fields, but we might in future,
 485  * so leave this code in */
 486 #if 0
 487 /*
 488  * sdev_rd_attr: create a function and attribute variable for a
 489  * read/write bit field.
 490  */
 491 #define sdev_rw_attr_bit(field)                                         \
 492         sdev_show_function(field, "%d\n")                                       \
 493                                                                         \
 494 static ssize_t                                                          \
 495 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 496                     const char *buf, size_t count)                      \
 497 {                                                                       \
 498         int ret;                                                        \
 499         struct scsi_device *sdev;                                       \
 500         ret = scsi_sdev_check_buf_bit(buf);                             \
 501         if (ret >= 0)   {                                               \
 502                 sdev = to_scsi_device(dev);                             \
 503                 sdev->field = ret;                                      \
 504                 ret = count;                                            \
 505         }                                                               \
 506         return ret;                                                     \
 507 }                                                                       \
 508 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 509
 510 /*
 511  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 512  * else return -EINVAL.
 513  */
 514 static int scsi_sdev_check_buf_bit(const char *buf)
 515 {
 516         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 517                 if (buf[0] == '1')
 518                         return 1;
 519                 else if (buf[0] == '0')
 520                         return 0;
 521                 else
 522                         return -EINVAL;
 523         } else
 524                 return -EINVAL;
 525 }
 526 #endif
 527 /*
 528  * Create the actual show/store functions and data structures.
 529  */
 530 sdev_rd_attr (device_blocked, "%d\n");
 531 sdev_rd_attr (queue_depth, "%d\n");
 532 sdev_rd_attr (type, "%d\n");
 533 sdev_rd_attr (scsi_level, "%d\n");
 534 sdev_rd_attr (vendor, "%.8s\n");
 535 sdev_rd_attr (model, "%.16s\n");
 536 sdev_rd_attr (rev, "%.4s\n");
 537
 538 /*
 539  * TODO: can we make these symlinks to the block layer ones?
 540  */
 541 static ssize_t
 542 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 543 {
 544         struct scsi_device *sdev;
 545         sdev = to_scsi_device(dev);
 546         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 547 }
 548
 549 static ssize_t
 550 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 551                     const char *buf, size_t count)
 552 {
 553         struct scsi_device *sdev;
 554         int timeout;
 555         sdev = to_scsi_device(dev);
 556         sscanf (buf, "%d\n", &timeout);
 557         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 558         return count;
 559 }
 560 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 561
 562 static ssize_t
 563 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 564 {
 565         struct scsi_device *sdev;
 566         sdev = to_scsi_device(dev);
 567         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 568 }
 569
 570 static ssize_t
 571 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 572                     const char *buf, size_t count)
 573 {
 574         struct scsi_device *sdev;
 575         unsigned int eh_timeout;
 576         int err;
 577
 578         if (!capable(CAP_SYS_ADMIN))
 579                 return -EACCES;
 580
 581         sdev = to_scsi_device(dev);
 582         err = kstrtouint(buf, 10, &eh_timeout);
 583         if (err)
 584                 return err;
 585         sdev->eh_timeout = eh_timeout * HZ;
 586
 587         return count;
 588 }
 589 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 590
 591 static ssize_t
 592 store_rescan_field (struct device *dev, struct device_attribute *attr,
 593                     const char *buf, size_t count)
 594 {
 595         scsi_rescan_device(dev);
 596         return count;
 597 }
 598 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 599
 600 static void sdev_store_delete_callback(struct device *dev)
 601 {
 602         scsi_remove_device(to_scsi_device(dev));
 603 }
 604
 605 static ssize_t
 606 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 607                   const char *buf, size_t count)
 608 {
 609         int rc;
 610
 611         /* An attribute cannot be unregistered by one of its own methods,
 612          * so we have to use this roundabout approach.
 613          */
 614         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 615         if (rc)
 616                 count = rc;
 617         return count;
 618 };
 619 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 620
 621 static ssize_t
 622 store_state_field(struct device *dev, struct device_attribute *attr,
 623                   const char *buf, size_t count)
 624 {
 625         int i;
 626         struct scsi_device *sdev = to_scsi_device(dev);
 627         enum scsi_device_state state = 0;
 628
 629         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 630                 const int len = strlen(sdev_states[i].name);
 631                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 632                    buf[len] == '\n') {
 633                         state = sdev_states[i].value;
 634                         break;
 635                 }
 636         }
 637         if (!state)
 638                 return -EINVAL;
 639
 640         if (scsi_device_set_state(sdev, state))
 641                 return -EINVAL;
 642         return count;
 643 }
 644
 645 static ssize_t
 646 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 647 {
 648         struct scsi_device *sdev = to_scsi_device(dev);
 649         const char *name = scsi_device_state_name(sdev->sdev_state);
 650
 651         if (!name)
 652                 return -EINVAL;
 653
 654         return snprintf(buf, 20, "%s\n", name);
 655 }
 656
 657 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 658
 659 static ssize_t
 660 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 661                       char *buf)
 662 {
 663         struct scsi_device *sdev = to_scsi_device(dev);
 664         const char *name = "none";
 665
 666         if (sdev->ordered_tags)
 667                 name = "ordered";
 668         else if (sdev->simple_tags)
 669                 name = "simple";
 670
 671         return snprintf(buf, 20, "%s\n", name);
 672 }
 673
 674 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 675
 676 static ssize_t
 677 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 678 {
 679         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 680 }
 681
 682 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 683
 684 #define show_sdev_iostat(field)                                         \
 685 static ssize_t                                                          \
 686 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 687                     char *buf)                                          \
 688 {                                                                       \
 689         struct scsi_device *sdev = to_scsi_device(dev);                 \
 690         unsigned long long count = atomic_read(&sdev->field);           \
 691         return snprintf(buf, 20, "0x%llx\n", count);                    \
 692 }                                                                       \
 693 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 694
 695 show_sdev_iostat(iorequest_cnt);
 696 show_sdev_iostat(iodone_cnt);
 697 show_sdev_iostat(ioerr_cnt);
 698
 699 static ssize_t
 700 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 701 {
 702         struct scsi_device *sdev;
 703         sdev = to_scsi_device(dev);
 704         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 705 }
 706 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 707
 708 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 709 static ssize_t                                                          \
 710 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 711                      char *buf)                                         \
 712 {                                                                       \
 713         struct scsi_device *sdev = to_scsi_device(dev);                 \
 714         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 715         return snprintf(buf, 20, "%d\n", val);                          \
 716 }
 717
 718 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 719 static ssize_t                                                          \
 720 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 721                       const char *buf, size_t count)                    \
 722 {                                                                       \
 723         struct scsi_device *sdev = to_scsi_device(dev);                 \
 724         int val = simple_strtoul(buf, NULL, 0);                         \
 725         if (val == 0)                                                   \
 726                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 727         else if (val == 1)                                              \
 728                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 729         else                                                            \
 730                 return -EINVAL;                                         \
 731         return count;                                                   \
 732 }
 733
 734 #define DECLARE_EVT(name, Cap_name)                                     \
 735         DECLARE_EVT_SHOW(name, Cap_name)                                \
 736         DECLARE_EVT_STORE(name, Cap_name)                               \
 737         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 738                            sdev_store_evt_##name);
 739 #define REF_EVT(name) &dev_attr_evt_##name.attr
 740
 741 DECLARE_EVT(media_change, MEDIA_CHANGE)
 742
 743 /* Default template for device attributes.  May NOT be modified */
 744 static struct attribute *scsi_sdev_attrs[] = {
 745         &dev_attr_device_blocked.attr,
 746         &dev_attr_type.attr,
 747         &dev_attr_scsi_level.attr,
 748         &dev_attr_vendor.attr,
 749         &dev_attr_model.attr,
 750         &dev_attr_rev.attr,
 751         &dev_attr_rescan.attr,
 752         &dev_attr_delete.attr,
 753         &dev_attr_state.attr,
 754         &dev_attr_timeout.attr,
 755         &dev_attr_eh_timeout.attr,
 756         &dev_attr_iocounterbits.attr,
 757         &dev_attr_iorequest_cnt.attr,
 758         &dev_attr_iodone_cnt.attr,
 759         &dev_attr_ioerr_cnt.attr,
 760         &dev_attr_modalias.attr,
 761         REF_EVT(media_change),
 762         NULL
 763 };
 764
 765 static struct attribute_group scsi_sdev_attr_group = {
 766         .attrs =        scsi_sdev_attrs,
 767 };
 768
 769 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 770         &scsi_sdev_attr_group,
 771         NULL
 772 };
 773
 774 static ssize_t
 775 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 776                           const char *buf, size_t count)
 777 {
 778         int depth, retval;
 779         struct scsi_device *sdev = to_scsi_device(dev);
 780         struct scsi_host_template *sht = sdev->host->hostt;
 781
 782         if (!sht->change_queue_depth)
 783                 return -EINVAL;
 784
 785         depth = simple_strtoul(buf, NULL, 0);
 786
 787         if (depth < 1)
 788                 return -EINVAL;
 789
 790         retval = sht->change_queue_depth(sdev, depth,
 791                                          SCSI_QDEPTH_DEFAULT);
 792         if (retval < 0)
 793                 return retval;
 794
 795         sdev->max_queue_depth = sdev->queue_depth;
 796
 797         return count;
 798 }
 799
 800 static struct device_attribute sdev_attr_queue_depth_rw =
 801         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 802                sdev_store_queue_depth_rw);
 803
 804 static ssize_t
 805 sdev_show_queue_ramp_up_period(struct device *dev,
 806                                struct device_attribute *attr,
 807                                char *buf)
 808 {
 809         struct scsi_device *sdev;
 810         sdev = to_scsi_device(dev);
 811         return snprintf(buf, 20, "%u\n",
 812                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 813 }
 814
 815 static ssize_t
 816 sdev_store_queue_ramp_up_period(struct device *dev,
 817                                 struct device_attribute *attr,
 818                                 const char *buf, size_t count)
 819 {
 820         struct scsi_device *sdev = to_scsi_device(dev);
 821         unsigned long period;
 822
 823         if (strict_strtoul(buf, 10, &period))
 824                 return -EINVAL;
 825
 826         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 827         return period;
 828 }
 829
 830 static struct device_attribute sdev_attr_queue_ramp_up_period =
 831         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 832                sdev_show_queue_ramp_up_period,
 833                sdev_store_queue_ramp_up_period);
 834
 835 static ssize_t
 836 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 837                          const char *buf, size_t count)
 838 {
 839         struct scsi_device *sdev = to_scsi_device(dev);
 840         struct scsi_host_template *sht = sdev->host->hostt;
 841         int tag_type = 0, retval;
 842         int prev_tag_type = scsi_get_tag_type(sdev);
 843
 844         if (!sdev->tagged_supported || !sht->change_queue_type)
 845                 return -EINVAL;
 846
 847         if (strncmp(buf, "ordered", 7) == 0)
 848                 tag_type = MSG_ORDERED_TAG;
 849         else if (strncmp(buf, "simple", 6) == 0)
 850                 tag_type = MSG_SIMPLE_TAG;
 851         else if (strncmp(buf, "none", 4) != 0)
 852                 return -EINVAL;
 853
 854         if (tag_type == prev_tag_type)
 855                 return count;
 856
 857         retval = sht->change_queue_type(sdev, tag_type);
 858         if (retval < 0)
 859                 return retval;
 860
 861         return count;
 862 }
 863
 864 static int scsi_target_add(struct scsi_target *starget)
 865 {
 866         int error;
 867
 868         if (starget->state != STARGET_CREATED)
 869                 return 0;
 870
 871         error = device_add(&starget->dev);
 872         if (error) {
 873                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 874                 return error;
 875         }
 876         transport_add_device(&starget->dev);
 877         starget->state = STARGET_RUNNING;
 878
 879         pm_runtime_set_active(&starget->dev);
 880         pm_runtime_enable(&starget->dev);
 881         device_enable_async_suspend(&starget->dev);
 882
 883         return 0;
 884 }
 885
 886 static struct device_attribute sdev_attr_queue_type_rw =
 887         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 888                sdev_store_queue_type_rw);
 889
 890 /**
 891  * scsi_sysfs_add_sdev - add scsi device to sysfs
 892  * @sdev:       scsi_device to add
 893  *
 894  * Return value:
 895  *      0 on Success / non-zero on Failure
 896  **/
 897 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 898 {
 899         int error, i;
 900         struct request_queue *rq = sdev->request_queue;
 901         struct scsi_target *starget = sdev->sdev_target;
 902
 903         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 904         if (error)
 905                 return error;
 906
 907         error = scsi_target_add(starget);
 908         if (error)
 909                 return error;
 910
 911         transport_configure_device(&starget->dev);
 912
 913         device_enable_async_suspend(&sdev->sdev_gendev);
 914         scsi_autopm_get_target(starget);
 915         pm_runtime_set_active(&sdev->sdev_gendev);
 916         pm_runtime_forbid(&sdev->sdev_gendev);
 917         pm_runtime_enable(&sdev->sdev_gendev);
 918         scsi_autopm_put_target(starget);
 919
 920         /* The following call will keep sdev active indefinitely, until
 921          * its driver does a corresponding scsi_autopm_pm_device().  Only
 922          * drivers supporting autosuspend will do this.
 923          */
 924         scsi_autopm_get_device(sdev);
 925
 926         error = device_add(&sdev->sdev_gendev);
 927         if (error) {
 928                 sdev_printk(KERN_INFO, sdev,
 929                                 "failed to add device: %d\n", error);
 930                 return error;
 931         }
 932         device_enable_async_suspend(&sdev->sdev_dev);
 933         error = device_add(&sdev->sdev_dev);
 934         if (error) {
 935                 sdev_printk(KERN_INFO, sdev,
 936                                 "failed to add class device: %d\n", error);
 937                 device_del(&sdev->sdev_gendev);
 938                 return error;
 939         }
 940         transport_add_device(&sdev->sdev_gendev);
 941         sdev->is_visible = 1;
 942
 943         /* create queue files, which may be writable, depending on the host */
 944         if (sdev->host->hostt->change_queue_depth) {
 945                 error = device_create_file(&sdev->sdev_gendev,
 946                                            &sdev_attr_queue_depth_rw);
 947                 error = device_create_file(&sdev->sdev_gendev,
 948                                            &sdev_attr_queue_ramp_up_period);
 949         }
 950         else
 951                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 952         if (error)
 953                 return error;
 954
 955         if (sdev->host->hostt->change_queue_type)
 956                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 957         else
 958                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 959         if (error)
 960                 return error;
 961
 962         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 963
 964         if (error)
 965                 /* we're treating error on bsg register as non-fatal,
 966                  * so pretend nothing went wrong */
 967                 sdev_printk(KERN_INFO, sdev,
 968                             "Failed to register bsg queue, errno=%d\n", error);
 969
 970         /* add additional host specific attributes */
 971         if (sdev->host->hostt->sdev_attrs) {
 972                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 973                         error = device_create_file(&sdev->sdev_gendev,
 974                                         sdev->host->hostt->sdev_attrs[i]);
 975                         if (error)
 976                                 return error;
 977                 }
 978         }
 979
 980         return error;
 981 }
 982
 983 void __scsi_remove_device(struct scsi_device *sdev)
 984 {
 985         struct device *dev = &sdev->sdev_gendev;
 986
 987         if (sdev->is_visible) {
 988                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 989                         return;
 990
 991                 bsg_unregister_queue(sdev->request_queue);
 992                 device_unregister(&sdev->sdev_dev);
 993                 transport_remove_device(dev);
 994                 device_del(dev);
 995         } else
 996                 put_device(&sdev->sdev_dev);
 997
 998         /*
 999          * Stop accepting new requests and wait until all queuecommand() and
1000          * scsi_run_queue() invocations have finished before tearing down the
1001          * device.
1002          */
1003         scsi_device_set_state(sdev, SDEV_DEL);
1004         blk_cleanup_queue(sdev->request_queue);
1005         cancel_work_sync(&sdev->requeue_work);
1006
1007         if (sdev->host->hostt->slave_destroy)
1008                 sdev->host->hostt->slave_destroy(sdev);
1009         transport_destroy_device(dev);
1010
1011         put_device(dev);
1012 }
1013
1014 /**
1015  * scsi_remove_device - unregister a device from the scsi bus
1016  * @sdev:       scsi_device to unregister
1017  **/
1018 void scsi_remove_device(struct scsi_device *sdev)
1019 {
1020         struct Scsi_Host *shost = sdev->host;
1021
1022         mutex_lock(&shost->scan_mutex);
1023         __scsi_remove_device(sdev);
1024         mutex_unlock(&shost->scan_mutex);
1025 }
1026 EXPORT_SYMBOL(scsi_remove_device);
1027
1028 static void __scsi_remove_target(struct scsi_target *starget)
1029 {
1030         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1031         unsigned long flags;
1032         struct scsi_device *sdev;
1033
1034         spin_lock_irqsave(shost->host_lock, flags);
1035  restart:
1036         list_for_each_entry(sdev, &shost->__devices, siblings) {
1037                 if (sdev->channel != starget->channel ||
1038                     sdev->id != starget->id ||
1039                     scsi_device_get(sdev))
1040                         continue;
1041                 spin_unlock_irqrestore(shost->host_lock, flags);
1042                 scsi_remove_device(sdev);
1043                 scsi_device_put(sdev);
1044                 spin_lock_irqsave(shost->host_lock, flags);
1045                 goto restart;
1046         }
1047         spin_unlock_irqrestore(shost->host_lock, flags);
1048 }
1049
1050 /**
1051  * scsi_remove_target - try to remove a target and all its devices
1052  * @dev: generic starget or parent of generic stargets to be removed
1053  *
1054  * Note: This is slightly racy.  It is possible that if the user
1055  * requests the addition of another device then the target won't be
1056  * removed.
1057  */
1058 void scsi_remove_target(struct device *dev)
1059 {
1060         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1061         struct scsi_target *starget, *last = NULL;
1062         unsigned long flags;
1063
1064         /* remove targets being careful to lookup next entry before
1065          * deleting the last
1066          */
1067         spin_lock_irqsave(shost->host_lock, flags);
1068         list_for_each_entry(starget, &shost->__targets, siblings) {
1069                 if (starget->state == STARGET_DEL)
1070                         continue;
1071                 if (starget->dev.parent == dev || &starget->dev == dev) {
1072                         /* assuming new targets arrive at the end */
1073                         starget->reap_ref++;
1074                         spin_unlock_irqrestore(shost->host_lock, flags);
1075                         if (last)
1076                                 scsi_target_reap(last);
1077                         last = starget;
1078                         __scsi_remove_target(starget);
1079                         spin_lock_irqsave(shost->host_lock, flags);
1080                 }
1081         }
1082         spin_unlock_irqrestore(shost->host_lock, flags);
1083
1084         if (last)
1085                 scsi_target_reap(last);
1086 }
1087 EXPORT_SYMBOL(scsi_remove_target);
1088
1089 int scsi_register_driver(struct device_driver *drv)
1090 {
1091         drv->bus = &scsi_bus_type;
1092
1093         return driver_register(drv);
1094 }
1095 EXPORT_SYMBOL(scsi_register_driver);
1096
1097 int scsi_register_interface(struct class_interface *intf)
1098 {
1099         intf->class = &sdev_class;
1100
1101         return class_interface_register(intf);
1102 }
1103 EXPORT_SYMBOL(scsi_register_interface);
1104
1105 /**
1106  * scsi_sysfs_add_host - add scsi host to subsystem
1107  * @shost:     scsi host struct to add to subsystem
1108  **/
1109 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1110 {
1111         int error, i;
1112
1113         /* add host specific attributes */
1114         if (shost->hostt->shost_attrs) {
1115                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1116                         error = device_create_file(&shost->shost_dev,
1117                                         shost->hostt->shost_attrs[i]);
1118                         if (error)
1119                                 return error;
1120                 }
1121         }
1122
1123         transport_register_device(&shost->shost_gendev);
1124         transport_configure_device(&shost->shost_gendev);
1125         return 0;
1126 }
1127
1128 static struct device_type scsi_dev_type = {
1129         .name =         "scsi_device",
1130         .release =      scsi_device_dev_release,
1131         .groups =       scsi_sdev_attr_groups,
1132 };
1133
1134 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1135 {
1136         unsigned long flags;
1137         struct Scsi_Host *shost = sdev->host;
1138         struct scsi_target  *starget = sdev->sdev_target;
1139
1140         device_initialize(&sdev->sdev_gendev);
1141         sdev->sdev_gendev.bus = &scsi_bus_type;
1142         sdev->sdev_gendev.type = &scsi_dev_type;
1143         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1144                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1145
1146         device_initialize(&sdev->sdev_dev);
1147         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1148         sdev->sdev_dev.class = &sdev_class;
1149         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1150                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1151         sdev->scsi_level = starget->scsi_level;
1152         transport_setup_device(&sdev->sdev_gendev);
1153         spin_lock_irqsave(shost->host_lock, flags);
1154         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1155         list_add_tail(&sdev->siblings, &shost->__devices);
1156         spin_unlock_irqrestore(shost->host_lock, flags);
1157 }
1158
1159 int scsi_is_sdev_device(const struct device *dev)
1160 {
1161         return dev->type == &scsi_dev_type;
1162 }
1163 EXPORT_SYMBOL(scsi_is_sdev_device);
1164
1165 /* A blank transport template that is used in drivers that don't
1166  * yet implement Transport Attributes */
1167 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };