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