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 struct device_type scsi_dev_type;
  25
  26 static const struct {
  27         enum scsi_device_state  value;
  28         char                    *name;
  29 } sdev_states[] = {
  30         { SDEV_CREATED, "created" },
  31         { SDEV_RUNNING, "running" },
  32         { SDEV_CANCEL, "cancel" },
  33         { SDEV_DEL, "deleted" },
  34         { SDEV_QUIESCE, "quiesce" },
  35         { SDEV_OFFLINE, "offline" },
  36         { SDEV_BLOCK,   "blocked" },
  37         { SDEV_CREATED_BLOCK, "created-blocked" },
  38 };
  39
  40 const char *scsi_device_state_name(enum scsi_device_state state)
  41 {
  42         int i;
  43         char *name = NULL;
  44
  45         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  46                 if (sdev_states[i].value == state) {
  47                         name = sdev_states[i].name;
  48                         break;
  49                 }
  50         }
  51         return name;
  52 }
  53
  54 static const struct {
  55         enum scsi_host_state    value;
  56         char                    *name;
  57 } shost_states[] = {
  58         { SHOST_CREATED, "created" },
  59         { SHOST_RUNNING, "running" },
  60         { SHOST_CANCEL, "cancel" },
  61         { SHOST_DEL, "deleted" },
  62         { SHOST_RECOVERY, "recovery" },
  63         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  64         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  65 };
  66 const char *scsi_host_state_name(enum scsi_host_state state)
  67 {
  68         int i;
  69         char *name = NULL;
  70
  71         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  72                 if (shost_states[i].value == state) {
  73                         name = shost_states[i].name;
  74                         break;
  75                 }
  76         }
  77         return name;
  78 }
  79
  80 static int check_set(unsigned int *val, char *src)
  81 {
  82         char *last;
  83
  84         if (strncmp(src, "-", 20) == 0) {
  85                 *val = SCAN_WILD_CARD;
  86         } else {
  87                 /*
  88                  * Doesn't check for int overflow
  89                  */
  90                 *val = simple_strtoul(src, &last, 0);
  91                 if (*last != '\0')
  92                         return 1;
  93         }
  94         return 0;
  95 }
  96
  97 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  98 {
  99         char s1[15], s2[15], s3[15], junk;
 100         unsigned int channel, id, lun;
 101         int res;
 102
 103         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 104         if (res != 3)
 105                 return -EINVAL;
 106         if (check_set(&channel, s1))
 107                 return -EINVAL;
 108         if (check_set(&id, s2))
 109                 return -EINVAL;
 110         if (check_set(&lun, s3))
 111                 return -EINVAL;
 112         if (shost->transportt->user_scan)
 113                 res = shost->transportt->user_scan(shost, channel, id, lun);
 114         else
 115                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 116         return res;
 117 }
 118
 119 /*
 120  * shost_show_function: macro to create an attr function that can be used to
 121  * show a non-bit field.
 122  */
 123 #define shost_show_function(name, field, format_string)                 \
 124 static ssize_t                                                          \
 125 show_##name (struct device *dev, struct device_attribute *attr,         \
 126              char *buf)                                                 \
 127 {                                                                       \
 128         struct Scsi_Host *shost = class_to_shost(dev);                  \
 129         return snprintf (buf, 20, format_string, shost->field);         \
 130 }
 131
 132 /*
 133  * shost_rd_attr: macro to create a function and attribute variable for a
 134  * read only field.
 135  */
 136 #define shost_rd_attr2(name, field, format_string)                      \
 137         shost_show_function(name, field, format_string)                 \
 138 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 139
 140 #define shost_rd_attr(field, format_string) \
 141 shost_rd_attr2(field, field, format_string)
 142
 143 /*
 144  * Create the actual show/store functions and data structures.
 145  */
 146
 147 static ssize_t
 148 store_scan(struct device *dev, struct device_attribute *attr,
 149            const char *buf, size_t count)
 150 {
 151         struct Scsi_Host *shost = class_to_shost(dev);
 152         int res;
 153
 154         res = scsi_scan(shost, buf);
 155         if (res == 0)
 156                 res = count;
 157         return res;
 158 };
 159 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 160
 161 static ssize_t
 162 store_shost_state(struct device *dev, struct device_attribute *attr,
 163                   const char *buf, size_t count)
 164 {
 165         int i;
 166         struct Scsi_Host *shost = class_to_shost(dev);
 167         enum scsi_host_state state = 0;
 168
 169         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 170                 const int len = strlen(shost_states[i].name);
 171                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 172                    buf[len] == '\n') {
 173                         state = shost_states[i].value;
 174                         break;
 175                 }
 176         }
 177         if (!state)
 178                 return -EINVAL;
 179
 180         if (scsi_host_set_state(shost, state))
 181                 return -EINVAL;
 182         return count;
 183 }
 184
 185 static ssize_t
 186 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 187 {
 188         struct Scsi_Host *shost = class_to_shost(dev);
 189         const char *name = scsi_host_state_name(shost->shost_state);
 190
 191         if (!name)
 192                 return -EINVAL;
 193
 194         return snprintf(buf, 20, "%s\n", name);
 195 }
 196
 197 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 198 struct device_attribute dev_attr_hstate =
 199         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 200
 201 static ssize_t
 202 show_shost_mode(unsigned int mode, char *buf)
 203 {
 204         ssize_t len = 0;
 205
 206         if (mode & MODE_INITIATOR)
 207                 len = sprintf(buf, "%s", "Initiator");
 208
 209         if (mode & MODE_TARGET)
 210                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 211
 212         len += sprintf(buf + len, "\n");
 213
 214         return len;
 215 }
 216
 217 static ssize_t
 218 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 219                           char *buf)
 220 {
 221         struct Scsi_Host *shost = class_to_shost(dev);
 222         unsigned int supported_mode = shost->hostt->supported_mode;
 223
 224         if (supported_mode == MODE_UNKNOWN)
 225                 /* by default this should be initiator */
 226                 supported_mode = MODE_INITIATOR;
 227
 228         return show_shost_mode(supported_mode, buf);
 229 }
 230
 231 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 232
 233 static ssize_t
 234 show_shost_active_mode(struct device *dev,
 235                        struct device_attribute *attr, char *buf)
 236 {
 237         struct Scsi_Host *shost = class_to_shost(dev);
 238
 239         if (shost->active_mode == MODE_UNKNOWN)
 240                 return snprintf(buf, 20, "unknown\n");
 241         else
 242                 return show_shost_mode(shost->active_mode, buf);
 243 }
 244
 245 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 246
 247 shost_rd_attr(unique_id, "%u\n");
 248 shost_rd_attr(host_busy, "%hu\n");
 249 shost_rd_attr(cmd_per_lun, "%hd\n");
 250 shost_rd_attr(can_queue, "%hd\n");
 251 shost_rd_attr(sg_tablesize, "%hu\n");
 252 shost_rd_attr(unchecked_isa_dma, "%d\n");
 253 shost_rd_attr(prot_capabilities, "%u\n");
 254 shost_rd_attr(prot_guard_type, "%hd\n");
 255 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 256
 257 static struct attribute *scsi_sysfs_shost_attrs[] = {
 258         &dev_attr_unique_id.attr,
 259         &dev_attr_host_busy.attr,
 260         &dev_attr_cmd_per_lun.attr,
 261         &dev_attr_can_queue.attr,
 262         &dev_attr_sg_tablesize.attr,
 263         &dev_attr_unchecked_isa_dma.attr,
 264         &dev_attr_proc_name.attr,
 265         &dev_attr_scan.attr,
 266         &dev_attr_hstate.attr,
 267         &dev_attr_supported_mode.attr,
 268         &dev_attr_active_mode.attr,
 269         &dev_attr_prot_capabilities.attr,
 270         &dev_attr_prot_guard_type.attr,
 271         NULL
 272 };
 273
 274 struct attribute_group scsi_shost_attr_group = {
 275         .attrs =        scsi_sysfs_shost_attrs,
 276 };
 277
 278 struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 279         &scsi_shost_attr_group,
 280         NULL
 281 };
 282
 283 static void scsi_device_cls_release(struct device *class_dev)
 284 {
 285         struct scsi_device *sdev;
 286
 287         sdev = class_to_sdev(class_dev);
 288         put_device(&sdev->sdev_gendev);
 289 }
 290
 291 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 292 {
 293         struct scsi_device *sdev;
 294         struct device *parent;
 295         struct scsi_target *starget;
 296         struct list_head *this, *tmp;
 297         unsigned long flags;
 298
 299         sdev = container_of(work, struct scsi_device, ew.work);
 300
 301         parent = sdev->sdev_gendev.parent;
 302         starget = to_scsi_target(parent);
 303
 304         spin_lock_irqsave(sdev->host->host_lock, flags);
 305         starget->reap_ref++;
 306         list_del(&sdev->siblings);
 307         list_del(&sdev->same_target_siblings);
 308         list_del(&sdev->starved_entry);
 309         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 310
 311         cancel_work_sync(&sdev->event_work);
 312
 313         list_for_each_safe(this, tmp, &sdev->event_list) {
 314                 struct scsi_event *evt;
 315
 316                 evt = list_entry(this, struct scsi_event, node);
 317                 list_del(&evt->node);
 318                 kfree(evt);
 319         }
 320
 321         if (sdev->request_queue) {
 322                 sdev->request_queue->queuedata = NULL;
 323                 /* user context needed to free queue */
 324                 scsi_free_queue(sdev->request_queue);
 325                 /* temporary expedient, try to catch use of queue lock
 326                  * after free of sdev */
 327                 sdev->request_queue = NULL;
 328         }
 329
 330         scsi_target_reap(scsi_target(sdev));
 331
 332         kfree(sdev->inquiry);
 333         kfree(sdev);
 334
 335         if (parent)
 336                 put_device(parent);
 337 }
 338
 339 static void scsi_device_dev_release(struct device *dev)
 340 {
 341         struct scsi_device *sdp = to_scsi_device(dev);
 342         execute_in_process_context(scsi_device_dev_release_usercontext,
 343                                    &sdp->ew);
 344 }
 345
 346 static struct class sdev_class = {
 347         .name           = "scsi_device",
 348         .dev_release    = scsi_device_cls_release,
 349 };
 350
 351 /* all probing is done in the individual ->probe routines */
 352 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 353 {
 354         struct scsi_device *sdp;
 355
 356         if (dev->type != &scsi_dev_type)
 357                 return 0;
 358
 359         sdp = to_scsi_device(dev);
 360         if (sdp->no_uld_attach)
 361                 return 0;
 362         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 363 }
 364
 365 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 366 {
 367         struct scsi_device *sdev;
 368
 369         if (dev->type != &scsi_dev_type)
 370                 return 0;
 371
 372         sdev = to_scsi_device(dev);
 373
 374         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 375         return 0;
 376 }
 377
 378 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 379 {
 380         struct device_driver *drv;
 381         struct scsi_device *sdev;
 382         int err;
 383
 384         if (dev->type != &scsi_dev_type)
 385                 return 0;
 386
 387         drv = dev->driver;
 388         sdev = to_scsi_device(dev);
 389
 390         err = scsi_device_quiesce(sdev);
 391         if (err)
 392                 return err;
 393
 394         if (drv && drv->suspend) {
 395                 err = drv->suspend(dev, state);
 396                 if (err)
 397                         return err;
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int scsi_bus_resume(struct device * dev)
 404 {
 405         struct device_driver *drv;
 406         struct scsi_device *sdev;
 407         int err = 0;
 408
 409         if (dev->type != &scsi_dev_type)
 410                 return 0;
 411
 412         drv = dev->driver;
 413         sdev = to_scsi_device(dev);
 414
 415         if (drv && drv->resume)
 416                 err = drv->resume(dev);
 417
 418         scsi_device_resume(sdev);
 419
 420         return err;
 421 }
 422
 423 static int scsi_bus_remove(struct device *dev)
 424 {
 425         struct device_driver *drv = dev->driver;
 426         struct scsi_device *sdev = to_scsi_device(dev);
 427         int err = 0;
 428
 429         /* reset the prep_fn back to the default since the
 430          * driver may have altered it and it's being removed */
 431         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
 432
 433         if (drv && drv->remove)
 434                 err = drv->remove(dev);
 435
 436         return 0;
 437 }
 438
 439 struct bus_type scsi_bus_type = {
 440         .name           = "scsi",
 441         .match          = scsi_bus_match,
 442         .uevent         = scsi_bus_uevent,
 443         .suspend        = scsi_bus_suspend,
 444         .resume         = scsi_bus_resume,
 445         .remove         = scsi_bus_remove,
 446 };
 447 EXPORT_SYMBOL_GPL(scsi_bus_type);
 448
 449 int scsi_sysfs_register(void)
 450 {
 451         int error;
 452
 453         error = bus_register(&scsi_bus_type);
 454         if (!error) {
 455                 error = class_register(&sdev_class);
 456                 if (error)
 457                         bus_unregister(&scsi_bus_type);
 458         }
 459
 460         return error;
 461 }
 462
 463 void scsi_sysfs_unregister(void)
 464 {
 465         class_unregister(&sdev_class);
 466         bus_unregister(&scsi_bus_type);
 467 }
 468
 469 /*
 470  * sdev_show_function: macro to create an attr function that can be used to
 471  * show a non-bit field.
 472  */
 473 #define sdev_show_function(field, format_string)                                \
 474 static ssize_t                                                          \
 475 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 476                    char *buf)                                           \
 477 {                                                                       \
 478         struct scsi_device *sdev;                                       \
 479         sdev = to_scsi_device(dev);                                     \
 480         return snprintf (buf, 20, format_string, sdev->field);          \
 481 }                                                                       \
 482
 483 /*
 484  * sdev_rd_attr: macro to create a function and attribute variable for a
 485  * read only field.
 486  */
 487 #define sdev_rd_attr(field, format_string)                              \
 488         sdev_show_function(field, format_string)                        \
 489 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 490
 491
 492 /*
 493  * sdev_rd_attr: create a function and attribute variable for a
 494  * read/write field.
 495  */
 496 #define sdev_rw_attr(field, format_string)                              \
 497         sdev_show_function(field, format_string)                                \
 498                                                                         \
 499 static ssize_t                                                          \
 500 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 501                     const char *buf, size_t count)                      \
 502 {                                                                       \
 503         struct scsi_device *sdev;                                       \
 504         sdev = to_scsi_device(dev);                                     \
 505         snscanf (buf, 20, format_string, &sdev->field);                 \
 506         return count;                                                   \
 507 }                                                                       \
 508 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 509
 510 /* Currently we don't export bit fields, but we might in future,
 511  * so leave this code in */
 512 #if 0
 513 /*
 514  * sdev_rd_attr: create a function and attribute variable for a
 515  * read/write bit field.
 516  */
 517 #define sdev_rw_attr_bit(field)                                         \
 518         sdev_show_function(field, "%d\n")                                       \
 519                                                                         \
 520 static ssize_t                                                          \
 521 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 522                     const char *buf, size_t count)                      \
 523 {                                                                       \
 524         int ret;                                                        \
 525         struct scsi_device *sdev;                                       \
 526         ret = scsi_sdev_check_buf_bit(buf);                             \
 527         if (ret >= 0)   {                                               \
 528                 sdev = to_scsi_device(dev);                             \
 529                 sdev->field = ret;                                      \
 530                 ret = count;                                            \
 531         }                                                               \
 532         return ret;                                                     \
 533 }                                                                       \
 534 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 535
 536 /*
 537  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 538  * else return -EINVAL.
 539  */
 540 static int scsi_sdev_check_buf_bit(const char *buf)
 541 {
 542         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 543                 if (buf[0] == '1')
 544                         return 1;
 545                 else if (buf[0] == '0')
 546                         return 0;
 547                 else
 548                         return -EINVAL;
 549         } else
 550                 return -EINVAL;
 551 }
 552 #endif
 553 /*
 554  * Create the actual show/store functions and data structures.
 555  */
 556 sdev_rd_attr (device_blocked, "%d\n");
 557 sdev_rd_attr (queue_depth, "%d\n");
 558 sdev_rd_attr (type, "%d\n");
 559 sdev_rd_attr (scsi_level, "%d\n");
 560 sdev_rd_attr (vendor, "%.8s\n");
 561 sdev_rd_attr (model, "%.16s\n");
 562 sdev_rd_attr (rev, "%.4s\n");
 563
 564 /*
 565  * TODO: can we make these symlinks to the block layer ones?
 566  */
 567 static ssize_t
 568 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 569 {
 570         struct scsi_device *sdev;
 571         sdev = to_scsi_device(dev);
 572         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 573 }
 574
 575 static ssize_t
 576 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 577                     const char *buf, size_t count)
 578 {
 579         struct scsi_device *sdev;
 580         int timeout;
 581         sdev = to_scsi_device(dev);
 582         sscanf (buf, "%d\n", &timeout);
 583         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 584         return count;
 585 }
 586 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 587
 588 static ssize_t
 589 store_rescan_field (struct device *dev, struct device_attribute *attr,
 590                     const char *buf, size_t count)
 591 {
 592         scsi_rescan_device(dev);
 593         return count;
 594 }
 595 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 596
 597 static void sdev_store_delete_callback(struct device *dev)
 598 {
 599         scsi_remove_device(to_scsi_device(dev));
 600 }
 601
 602 static ssize_t
 603 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 604                   const char *buf, size_t count)
 605 {
 606         int rc;
 607
 608         /* An attribute cannot be unregistered by one of its own methods,
 609          * so we have to use this roundabout approach.
 610          */
 611         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 612         if (rc)
 613                 count = rc;
 614         return count;
 615 };
 616 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 617
 618 static ssize_t
 619 store_state_field(struct device *dev, struct device_attribute *attr,
 620                   const char *buf, size_t count)
 621 {
 622         int i;
 623         struct scsi_device *sdev = to_scsi_device(dev);
 624         enum scsi_device_state state = 0;
 625
 626         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 627                 const int len = strlen(sdev_states[i].name);
 628                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 629                    buf[len] == '\n') {
 630                         state = sdev_states[i].value;
 631                         break;
 632                 }
 633         }
 634         if (!state)
 635                 return -EINVAL;
 636
 637         if (scsi_device_set_state(sdev, state))
 638                 return -EINVAL;
 639         return count;
 640 }
 641
 642 static ssize_t
 643 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 644 {
 645         struct scsi_device *sdev = to_scsi_device(dev);
 646         const char *name = scsi_device_state_name(sdev->sdev_state);
 647
 648         if (!name)
 649                 return -EINVAL;
 650
 651         return snprintf(buf, 20, "%s\n", name);
 652 }
 653
 654 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 655
 656 static ssize_t
 657 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 658                       char *buf)
 659 {
 660         struct scsi_device *sdev = to_scsi_device(dev);
 661         const char *name = "none";
 662
 663         if (sdev->ordered_tags)
 664                 name = "ordered";
 665         else if (sdev->simple_tags)
 666                 name = "simple";
 667
 668         return snprintf(buf, 20, "%s\n", name);
 669 }
 670
 671 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 672
 673 static ssize_t
 674 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 675 {
 676         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 677 }
 678
 679 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 680
 681 #define show_sdev_iostat(field)                                         \
 682 static ssize_t                                                          \
 683 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 684                     char *buf)                                          \
 685 {                                                                       \
 686         struct scsi_device *sdev = to_scsi_device(dev);                 \
 687         unsigned long long count = atomic_read(&sdev->field);           \
 688         return snprintf(buf, 20, "0x%llx\n", count);                    \
 689 }                                                                       \
 690 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 691
 692 show_sdev_iostat(iorequest_cnt);
 693 show_sdev_iostat(iodone_cnt);
 694 show_sdev_iostat(ioerr_cnt);
 695
 696 static ssize_t
 697 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 698 {
 699         struct scsi_device *sdev;
 700         sdev = to_scsi_device(dev);
 701         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 702 }
 703 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 704
 705 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 706 static ssize_t                                                          \
 707 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 708                      char *buf)                                         \
 709 {                                                                       \
 710         struct scsi_device *sdev = to_scsi_device(dev);                 \
 711         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 712         return snprintf(buf, 20, "%d\n", val);                          \
 713 }
 714
 715 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 716 static ssize_t                                                          \
 717 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 718                       const char *buf, size_t count)                    \
 719 {                                                                       \
 720         struct scsi_device *sdev = to_scsi_device(dev);                 \
 721         int val = simple_strtoul(buf, NULL, 0);                         \
 722         if (val == 0)                                                   \
 723                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 724         else if (val == 1)                                              \
 725                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 726         else                                                            \
 727                 return -EINVAL;                                         \
 728         return count;                                                   \
 729 }
 730
 731 #define DECLARE_EVT(name, Cap_name)                                     \
 732         DECLARE_EVT_SHOW(name, Cap_name)                                \
 733         DECLARE_EVT_STORE(name, Cap_name)                               \
 734         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 735                            sdev_store_evt_##name);
 736 #define REF_EVT(name) &dev_attr_evt_##name.attr
 737
 738 DECLARE_EVT(media_change, MEDIA_CHANGE)
 739
 740 /* Default template for device attributes.  May NOT be modified */
 741 static struct attribute *scsi_sdev_attrs[] = {
 742         &dev_attr_device_blocked.attr,
 743         &dev_attr_type.attr,
 744         &dev_attr_scsi_level.attr,
 745         &dev_attr_vendor.attr,
 746         &dev_attr_model.attr,
 747         &dev_attr_rev.attr,
 748         &dev_attr_rescan.attr,
 749         &dev_attr_delete.attr,
 750         &dev_attr_state.attr,
 751         &dev_attr_timeout.attr,
 752         &dev_attr_iocounterbits.attr,
 753         &dev_attr_iorequest_cnt.attr,
 754         &dev_attr_iodone_cnt.attr,
 755         &dev_attr_ioerr_cnt.attr,
 756         &dev_attr_modalias.attr,
 757         REF_EVT(media_change),
 758         NULL
 759 };
 760
 761 static struct attribute_group scsi_sdev_attr_group = {
 762         .attrs =        scsi_sdev_attrs,
 763 };
 764
 765 static struct attribute_group *scsi_sdev_attr_groups[] = {
 766         &scsi_sdev_attr_group,
 767         NULL
 768 };
 769
 770 static ssize_t
 771 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 772                           const char *buf, size_t count)
 773 {
 774         int depth, retval;
 775         struct scsi_device *sdev = to_scsi_device(dev);
 776         struct scsi_host_template *sht = sdev->host->hostt;
 777
 778         if (!sht->change_queue_depth)
 779                 return -EINVAL;
 780
 781         depth = simple_strtoul(buf, NULL, 0);
 782
 783         if (depth < 1)
 784                 return -EINVAL;
 785
 786         retval = sht->change_queue_depth(sdev, depth);
 787         if (retval < 0)
 788                 return retval;
 789
 790         return count;
 791 }
 792
 793 static struct device_attribute sdev_attr_queue_depth_rw =
 794         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 795                sdev_store_queue_depth_rw);
 796
 797 static ssize_t
 798 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 799                          const char *buf, size_t count)
 800 {
 801         struct scsi_device *sdev = to_scsi_device(dev);
 802         struct scsi_host_template *sht = sdev->host->hostt;
 803         int tag_type = 0, retval;
 804         int prev_tag_type = scsi_get_tag_type(sdev);
 805
 806         if (!sdev->tagged_supported || !sht->change_queue_type)
 807                 return -EINVAL;
 808
 809         if (strncmp(buf, "ordered", 7) == 0)
 810                 tag_type = MSG_ORDERED_TAG;
 811         else if (strncmp(buf, "simple", 6) == 0)
 812                 tag_type = MSG_SIMPLE_TAG;
 813         else if (strncmp(buf, "none", 4) != 0)
 814                 return -EINVAL;
 815
 816         if (tag_type == prev_tag_type)
 817                 return count;
 818
 819         retval = sht->change_queue_type(sdev, tag_type);
 820         if (retval < 0)
 821                 return retval;
 822
 823         return count;
 824 }
 825
 826 static int scsi_target_add(struct scsi_target *starget)
 827 {
 828         int error;
 829
 830         if (starget->state != STARGET_CREATED)
 831                 return 0;
 832
 833         error = device_add(&starget->dev);
 834         if (error) {
 835                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 836                 get_device(&starget->dev);
 837                 scsi_target_reap(starget);
 838                 put_device(&starget->dev);
 839                 return error;
 840         }
 841         transport_add_device(&starget->dev);
 842         starget->state = STARGET_RUNNING;
 843
 844         return 0;
 845 }
 846
 847 static struct device_attribute sdev_attr_queue_type_rw =
 848         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 849                sdev_store_queue_type_rw);
 850
 851 /**
 852  * scsi_sysfs_add_sdev - add scsi device to sysfs
 853  * @sdev:       scsi_device to add
 854  *
 855  * Return value:
 856  *      0 on Success / non-zero on Failure
 857  **/
 858 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 859 {
 860         int error, i;
 861         struct request_queue *rq = sdev->request_queue;
 862         struct scsi_target *starget = sdev->sdev_target;
 863
 864         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 865                 return error;
 866
 867         error = scsi_target_add(starget);
 868         if (error)
 869                 return error;
 870
 871         transport_configure_device(&starget->dev);
 872         error = device_add(&sdev->sdev_gendev);
 873         if (error) {
 874                 put_device(sdev->sdev_gendev.parent);
 875                 printk(KERN_INFO "error 1\n");
 876                 return error;
 877         }
 878         error = device_add(&sdev->sdev_dev);
 879         if (error) {
 880                 printk(KERN_INFO "error 2\n");
 881                 goto clean_device;
 882         }
 883
 884         /* take a reference for the sdev_dev; this is
 885          * released by the sdev_class .release */
 886         get_device(&sdev->sdev_gendev);
 887
 888         /* create queue files, which may be writable, depending on the host */
 889         if (sdev->host->hostt->change_queue_depth)
 890                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 891         else
 892                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 893         if (error) {
 894                 __scsi_remove_device(sdev);
 895                 goto out;
 896         }
 897         if (sdev->host->hostt->change_queue_type)
 898                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 899         else
 900                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 901         if (error) {
 902                 __scsi_remove_device(sdev);
 903                 goto out;
 904         }
 905
 906         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 907
 908         if (error)
 909                 sdev_printk(KERN_INFO, sdev,
 910                             "Failed to register bsg queue, errno=%d\n", error);
 911
 912         /* we're treating error on bsg register as non-fatal, so pretend
 913          * nothing went wrong */
 914         error = 0;
 915
 916         /* add additional host specific attributes */
 917         if (sdev->host->hostt->sdev_attrs) {
 918                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 919                         error = device_create_file(&sdev->sdev_gendev,
 920                                         sdev->host->hostt->sdev_attrs[i]);
 921                         if (error) {
 922                                 __scsi_remove_device(sdev);
 923                                 goto out;
 924                         }
 925                 }
 926         }
 927
 928         transport_add_device(&sdev->sdev_gendev);
 929  out:
 930         return error;
 931
 932  clean_device:
 933         scsi_device_set_state(sdev, SDEV_CANCEL);
 934
 935         device_del(&sdev->sdev_gendev);
 936         transport_destroy_device(&sdev->sdev_gendev);
 937         put_device(&sdev->sdev_gendev);
 938
 939         return error;
 940 }
 941
 942 void __scsi_remove_device(struct scsi_device *sdev)
 943 {
 944         struct device *dev = &sdev->sdev_gendev;
 945
 946         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 947                 return;
 948
 949         bsg_unregister_queue(sdev->request_queue);
 950         device_unregister(&sdev->sdev_dev);
 951         transport_remove_device(dev);
 952         device_del(dev);
 953         scsi_device_set_state(sdev, SDEV_DEL);
 954         if (sdev->host->hostt->slave_destroy)
 955                 sdev->host->hostt->slave_destroy(sdev);
 956         transport_destroy_device(dev);
 957         put_device(dev);
 958 }
 959
 960 /**
 961  * scsi_remove_device - unregister a device from the scsi bus
 962  * @sdev:       scsi_device to unregister
 963  **/
 964 void scsi_remove_device(struct scsi_device *sdev)
 965 {
 966         struct Scsi_Host *shost = sdev->host;
 967
 968         mutex_lock(&shost->scan_mutex);
 969         __scsi_remove_device(sdev);
 970         mutex_unlock(&shost->scan_mutex);
 971 }
 972 EXPORT_SYMBOL(scsi_remove_device);
 973
 974 static void __scsi_remove_target(struct scsi_target *starget)
 975 {
 976         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 977         unsigned long flags;
 978         struct scsi_device *sdev;
 979
 980         spin_lock_irqsave(shost->host_lock, flags);
 981         starget->reap_ref++;
 982  restart:
 983         list_for_each_entry(sdev, &shost->__devices, siblings) {
 984                 if (sdev->channel != starget->channel ||
 985                     sdev->id != starget->id ||
 986                     sdev->sdev_state == SDEV_DEL)
 987                         continue;
 988                 spin_unlock_irqrestore(shost->host_lock, flags);
 989                 scsi_remove_device(sdev);
 990                 spin_lock_irqsave(shost->host_lock, flags);
 991                 goto restart;
 992         }
 993         spin_unlock_irqrestore(shost->host_lock, flags);
 994         scsi_target_reap(starget);
 995 }
 996
 997 static int __remove_child (struct device * dev, void * data)
 998 {
 999         if (scsi_is_target_device(dev))
1000                 __scsi_remove_target(to_scsi_target(dev));
1001         return 0;
1002 }
1003
1004 /**
1005  * scsi_remove_target - try to remove a target and all its devices
1006  * @dev: generic starget or parent of generic stargets to be removed
1007  *
1008  * Note: This is slightly racy.  It is possible that if the user
1009  * requests the addition of another device then the target won't be
1010  * removed.
1011  */
1012 void scsi_remove_target(struct device *dev)
1013 {
1014         struct device *rdev;
1015
1016         if (scsi_is_target_device(dev)) {
1017                 __scsi_remove_target(to_scsi_target(dev));
1018                 return;
1019         }
1020
1021         rdev = get_device(dev);
1022         device_for_each_child(dev, NULL, __remove_child);
1023         put_device(rdev);
1024 }
1025 EXPORT_SYMBOL(scsi_remove_target);
1026
1027 int scsi_register_driver(struct device_driver *drv)
1028 {
1029         drv->bus = &scsi_bus_type;
1030
1031         return driver_register(drv);
1032 }
1033 EXPORT_SYMBOL(scsi_register_driver);
1034
1035 int scsi_register_interface(struct class_interface *intf)
1036 {
1037         intf->class = &sdev_class;
1038
1039         return class_interface_register(intf);
1040 }
1041 EXPORT_SYMBOL(scsi_register_interface);
1042
1043 /**
1044  * scsi_sysfs_add_host - add scsi host to subsystem
1045  * @shost:     scsi host struct to add to subsystem
1046  **/
1047 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1048 {
1049         int error, i;
1050
1051         /* add host specific attributes */
1052         if (shost->hostt->shost_attrs) {
1053                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1054                         error = device_create_file(&shost->shost_dev,
1055                                         shost->hostt->shost_attrs[i]);
1056                         if (error)
1057                                 return error;
1058                 }
1059         }
1060
1061         transport_register_device(&shost->shost_gendev);
1062         transport_configure_device(&shost->shost_gendev);
1063         return 0;
1064 }
1065
1066 static struct device_type scsi_dev_type = {
1067         .name =         "scsi_device",
1068         .release =      scsi_device_dev_release,
1069         .groups =       scsi_sdev_attr_groups,
1070 };
1071
1072 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1073 {
1074         unsigned long flags;
1075         struct Scsi_Host *shost = sdev->host;
1076         struct scsi_target  *starget = sdev->sdev_target;
1077
1078         device_initialize(&sdev->sdev_gendev);
1079         sdev->sdev_gendev.bus = &scsi_bus_type;
1080         sdev->sdev_gendev.type = &scsi_dev_type;
1081         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1082                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1083
1084         device_initialize(&sdev->sdev_dev);
1085         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1086         sdev->sdev_dev.class = &sdev_class;
1087         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1088                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1089         sdev->scsi_level = starget->scsi_level;
1090         transport_setup_device(&sdev->sdev_gendev);
1091         spin_lock_irqsave(shost->host_lock, flags);
1092         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1093         list_add_tail(&sdev->siblings, &shost->__devices);
1094         spin_unlock_irqrestore(shost->host_lock, flags);
1095 }
1096
1097 int scsi_is_sdev_device(const struct device *dev)
1098 {
1099         return dev->type == &scsi_dev_type;
1100 }
1101 EXPORT_SYMBOL(scsi_is_sdev_device);
1102
1103 /* A blank transport template that is used in drivers that don't
1104  * yet implement Transport Attributes */
1105 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };