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_attr2(proc_name, hostt->proc_name, "%s\n");
 253
 254 static struct attribute *scsi_sysfs_shost_attrs[] = {
 255         &dev_attr_unique_id.attr,
 256         &dev_attr_host_busy.attr,
 257         &dev_attr_cmd_per_lun.attr,
 258         &dev_attr_can_queue.attr,
 259         &dev_attr_sg_tablesize.attr,
 260         &dev_attr_unchecked_isa_dma.attr,
 261         &dev_attr_proc_name.attr,
 262         &dev_attr_scan.attr,
 263         &dev_attr_hstate.attr,
 264         &dev_attr_supported_mode.attr,
 265         &dev_attr_active_mode.attr,
 266         NULL
 267 };
 268
 269 struct attribute_group scsi_shost_attr_group = {
 270         .attrs =        scsi_sysfs_shost_attrs,
 271 };
 272
 273 struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 274         &scsi_shost_attr_group,
 275         NULL
 276 };
 277
 278 static void scsi_device_cls_release(struct device *class_dev)
 279 {
 280         struct scsi_device *sdev;
 281
 282         sdev = class_to_sdev(class_dev);
 283         put_device(&sdev->sdev_gendev);
 284 }
 285
 286 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 287 {
 288         struct scsi_device *sdev;
 289         struct device *parent;
 290         struct scsi_target *starget;
 291         struct list_head *this, *tmp;
 292         unsigned long flags;
 293
 294         sdev = container_of(work, struct scsi_device, ew.work);
 295
 296         parent = sdev->sdev_gendev.parent;
 297         starget = to_scsi_target(parent);
 298
 299         spin_lock_irqsave(sdev->host->host_lock, flags);
 300         starget->reap_ref++;
 301         list_del(&sdev->siblings);
 302         list_del(&sdev->same_target_siblings);
 303         list_del(&sdev->starved_entry);
 304         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 305
 306         cancel_work_sync(&sdev->event_work);
 307
 308         list_for_each_safe(this, tmp, &sdev->event_list) {
 309                 struct scsi_event *evt;
 310
 311                 evt = list_entry(this, struct scsi_event, node);
 312                 list_del(&evt->node);
 313                 kfree(evt);
 314         }
 315
 316         if (sdev->request_queue) {
 317                 sdev->request_queue->queuedata = NULL;
 318                 /* user context needed to free queue */
 319                 scsi_free_queue(sdev->request_queue);
 320                 /* temporary expedient, try to catch use of queue lock
 321                  * after free of sdev */
 322                 sdev->request_queue = NULL;
 323         }
 324
 325         scsi_target_reap(scsi_target(sdev));
 326
 327         kfree(sdev->inquiry);
 328         kfree(sdev);
 329
 330         if (parent)
 331                 put_device(parent);
 332 }
 333
 334 static void scsi_device_dev_release(struct device *dev)
 335 {
 336         struct scsi_device *sdp = to_scsi_device(dev);
 337         execute_in_process_context(scsi_device_dev_release_usercontext,
 338                                    &sdp->ew);
 339 }
 340
 341 static struct class sdev_class = {
 342         .name           = "scsi_device",
 343         .dev_release    = scsi_device_cls_release,
 344 };
 345
 346 /* all probing is done in the individual ->probe routines */
 347 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 348 {
 349         struct scsi_device *sdp;
 350
 351         if (dev->type != &scsi_dev_type)
 352                 return 0;
 353
 354         sdp = to_scsi_device(dev);
 355         if (sdp->no_uld_attach)
 356                 return 0;
 357         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 358 }
 359
 360 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 361 {
 362         struct scsi_device *sdev = to_scsi_device(dev);
 363
 364         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 365         return 0;
 366 }
 367
 368 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 369 {
 370         struct device_driver *drv;
 371         struct scsi_device *sdev;
 372         int err;
 373
 374         if (dev->type != &scsi_dev_type)
 375                 return 0;
 376
 377         drv = dev->driver;
 378         sdev = to_scsi_device(dev);
 379
 380         err = scsi_device_quiesce(sdev);
 381         if (err)
 382                 return err;
 383
 384         if (drv && drv->suspend) {
 385                 err = drv->suspend(dev, state);
 386                 if (err)
 387                         return err;
 388         }
 389
 390         return 0;
 391 }
 392
 393 static int scsi_bus_resume(struct device * dev)
 394 {
 395         struct device_driver *drv;
 396         struct scsi_device *sdev;
 397         int err = 0;
 398
 399         if (dev->type != &scsi_dev_type)
 400                 return 0;
 401
 402         drv = dev->driver;
 403         sdev = to_scsi_device(dev);
 404
 405         if (drv && drv->resume)
 406                 err = drv->resume(dev);
 407
 408         scsi_device_resume(sdev);
 409
 410         return err;
 411 }
 412
 413 static int scsi_bus_remove(struct device *dev)
 414 {
 415         struct device_driver *drv = dev->driver;
 416         struct scsi_device *sdev = to_scsi_device(dev);
 417         int err = 0;
 418
 419         /* reset the prep_fn back to the default since the
 420          * driver may have altered it and it's being removed */
 421         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
 422
 423         if (drv && drv->remove)
 424                 err = drv->remove(dev);
 425
 426         return 0;
 427 }
 428
 429 struct bus_type scsi_bus_type = {
 430         .name           = "scsi",
 431         .match          = scsi_bus_match,
 432         .uevent         = scsi_bus_uevent,
 433         .suspend        = scsi_bus_suspend,
 434         .resume         = scsi_bus_resume,
 435         .remove         = scsi_bus_remove,
 436 };
 437
 438 int scsi_sysfs_register(void)
 439 {
 440         int error;
 441
 442         error = bus_register(&scsi_bus_type);
 443         if (!error) {
 444                 error = class_register(&sdev_class);
 445                 if (error)
 446                         bus_unregister(&scsi_bus_type);
 447         }
 448
 449         return error;
 450 }
 451
 452 void scsi_sysfs_unregister(void)
 453 {
 454         class_unregister(&sdev_class);
 455         bus_unregister(&scsi_bus_type);
 456 }
 457
 458 /*
 459  * sdev_show_function: macro to create an attr function that can be used to
 460  * show a non-bit field.
 461  */
 462 #define sdev_show_function(field, format_string)                                \
 463 static ssize_t                                                          \
 464 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 465                    char *buf)                                           \
 466 {                                                                       \
 467         struct scsi_device *sdev;                                       \
 468         sdev = to_scsi_device(dev);                                     \
 469         return snprintf (buf, 20, format_string, sdev->field);          \
 470 }                                                                       \
 471
 472 /*
 473  * sdev_rd_attr: macro to create a function and attribute variable for a
 474  * read only field.
 475  */
 476 #define sdev_rd_attr(field, format_string)                              \
 477         sdev_show_function(field, format_string)                        \
 478 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 479
 480
 481 /*
 482  * sdev_rd_attr: create a function and attribute variable for a
 483  * read/write field.
 484  */
 485 #define sdev_rw_attr(field, format_string)                              \
 486         sdev_show_function(field, format_string)                                \
 487                                                                         \
 488 static ssize_t                                                          \
 489 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 490                     const char *buf, size_t count)                      \
 491 {                                                                       \
 492         struct scsi_device *sdev;                                       \
 493         sdev = to_scsi_device(dev);                                     \
 494         snscanf (buf, 20, format_string, &sdev->field);                 \
 495         return count;                                                   \
 496 }                                                                       \
 497 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 498
 499 /* Currently we don't export bit fields, but we might in future,
 500  * so leave this code in */
 501 #if 0
 502 /*
 503  * sdev_rd_attr: create a function and attribute variable for a
 504  * read/write bit field.
 505  */
 506 #define sdev_rw_attr_bit(field)                                         \
 507         sdev_show_function(field, "%d\n")                                       \
 508                                                                         \
 509 static ssize_t                                                          \
 510 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 511                     const char *buf, size_t count)                      \
 512 {                                                                       \
 513         int ret;                                                        \
 514         struct scsi_device *sdev;                                       \
 515         ret = scsi_sdev_check_buf_bit(buf);                             \
 516         if (ret >= 0)   {                                               \
 517                 sdev = to_scsi_device(dev);                             \
 518                 sdev->field = ret;                                      \
 519                 ret = count;                                            \
 520         }                                                               \
 521         return ret;                                                     \
 522 }                                                                       \
 523 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 524
 525 /*
 526  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 527  * else return -EINVAL.
 528  */
 529 static int scsi_sdev_check_buf_bit(const char *buf)
 530 {
 531         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 532                 if (buf[0] == '1')
 533                         return 1;
 534                 else if (buf[0] == '0')
 535                         return 0;
 536                 else
 537                         return -EINVAL;
 538         } else
 539                 return -EINVAL;
 540 }
 541 #endif
 542 /*
 543  * Create the actual show/store functions and data structures.
 544  */
 545 sdev_rd_attr (device_blocked, "%d\n");
 546 sdev_rd_attr (queue_depth, "%d\n");
 547 sdev_rd_attr (type, "%d\n");
 548 sdev_rd_attr (scsi_level, "%d\n");
 549 sdev_rd_attr (vendor, "%.8s\n");
 550 sdev_rd_attr (model, "%.16s\n");
 551 sdev_rd_attr (rev, "%.4s\n");
 552
 553 static ssize_t
 554 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 555 {
 556         struct scsi_device *sdev;
 557         sdev = to_scsi_device(dev);
 558         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 559 }
 560
 561 static ssize_t
 562 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 563                     const char *buf, size_t count)
 564 {
 565         struct scsi_device *sdev;
 566         int timeout;
 567         sdev = to_scsi_device(dev);
 568         sscanf (buf, "%d\n", &timeout);
 569         sdev->timeout = timeout * HZ;
 570         return count;
 571 }
 572 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 573
 574 static ssize_t
 575 store_rescan_field (struct device *dev, struct device_attribute *attr,
 576                     const char *buf, size_t count)
 577 {
 578         scsi_rescan_device(dev);
 579         return count;
 580 }
 581 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 582
 583 static void sdev_store_delete_callback(struct device *dev)
 584 {
 585         scsi_remove_device(to_scsi_device(dev));
 586 }
 587
 588 static ssize_t
 589 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 590                   const char *buf, size_t count)
 591 {
 592         int rc;
 593
 594         /* An attribute cannot be unregistered by one of its own methods,
 595          * so we have to use this roundabout approach.
 596          */
 597         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 598         if (rc)
 599                 count = rc;
 600         return count;
 601 };
 602 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 603
 604 static ssize_t
 605 store_state_field(struct device *dev, struct device_attribute *attr,
 606                   const char *buf, size_t count)
 607 {
 608         int i;
 609         struct scsi_device *sdev = to_scsi_device(dev);
 610         enum scsi_device_state state = 0;
 611
 612         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 613                 const int len = strlen(sdev_states[i].name);
 614                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 615                    buf[len] == '\n') {
 616                         state = sdev_states[i].value;
 617                         break;
 618                 }
 619         }
 620         if (!state)
 621                 return -EINVAL;
 622
 623         if (scsi_device_set_state(sdev, state))
 624                 return -EINVAL;
 625         return count;
 626 }
 627
 628 static ssize_t
 629 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 630 {
 631         struct scsi_device *sdev = to_scsi_device(dev);
 632         const char *name = scsi_device_state_name(sdev->sdev_state);
 633
 634         if (!name)
 635                 return -EINVAL;
 636
 637         return snprintf(buf, 20, "%s\n", name);
 638 }
 639
 640 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 641
 642 static ssize_t
 643 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 644                       char *buf)
 645 {
 646         struct scsi_device *sdev = to_scsi_device(dev);
 647         const char *name = "none";
 648
 649         if (sdev->ordered_tags)
 650                 name = "ordered";
 651         else if (sdev->simple_tags)
 652                 name = "simple";
 653
 654         return snprintf(buf, 20, "%s\n", name);
 655 }
 656
 657 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 658
 659 static ssize_t
 660 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 661 {
 662         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 663 }
 664
 665 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 666
 667 #define show_sdev_iostat(field)                                         \
 668 static ssize_t                                                          \
 669 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 670                     char *buf)                                          \
 671 {                                                                       \
 672         struct scsi_device *sdev = to_scsi_device(dev);                 \
 673         unsigned long long count = atomic_read(&sdev->field);           \
 674         return snprintf(buf, 20, "0x%llx\n", count);                    \
 675 }                                                                       \
 676 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 677
 678 show_sdev_iostat(iorequest_cnt);
 679 show_sdev_iostat(iodone_cnt);
 680 show_sdev_iostat(ioerr_cnt);
 681
 682 static ssize_t
 683 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 684 {
 685         struct scsi_device *sdev;
 686         sdev = to_scsi_device(dev);
 687         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 688 }
 689 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 690
 691 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 692 static ssize_t                                                          \
 693 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 694                      char *buf)                                         \
 695 {                                                                       \
 696         struct scsi_device *sdev = to_scsi_device(dev);                 \
 697         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 698         return snprintf(buf, 20, "%d\n", val);                          \
 699 }
 700
 701 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 702 static ssize_t                                                          \
 703 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 704                       const char *buf, size_t count)                    \
 705 {                                                                       \
 706         struct scsi_device *sdev = to_scsi_device(dev);                 \
 707         int val = simple_strtoul(buf, NULL, 0);                         \
 708         if (val == 0)                                                   \
 709                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 710         else if (val == 1)                                              \
 711                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 712         else                                                            \
 713                 return -EINVAL;                                         \
 714         return count;                                                   \
 715 }
 716
 717 #define DECLARE_EVT(name, Cap_name)                                     \
 718         DECLARE_EVT_SHOW(name, Cap_name)                                \
 719         DECLARE_EVT_STORE(name, Cap_name)                               \
 720         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 721                            sdev_store_evt_##name);
 722 #define REF_EVT(name) &dev_attr_evt_##name.attr
 723
 724 DECLARE_EVT(media_change, MEDIA_CHANGE)
 725
 726 /* Default template for device attributes.  May NOT be modified */
 727 static struct attribute *scsi_sdev_attrs[] = {
 728         &dev_attr_device_blocked.attr,
 729         &dev_attr_type.attr,
 730         &dev_attr_scsi_level.attr,
 731         &dev_attr_vendor.attr,
 732         &dev_attr_model.attr,
 733         &dev_attr_rev.attr,
 734         &dev_attr_rescan.attr,
 735         &dev_attr_delete.attr,
 736         &dev_attr_state.attr,
 737         &dev_attr_timeout.attr,
 738         &dev_attr_iocounterbits.attr,
 739         &dev_attr_iorequest_cnt.attr,
 740         &dev_attr_iodone_cnt.attr,
 741         &dev_attr_ioerr_cnt.attr,
 742         &dev_attr_modalias.attr,
 743         REF_EVT(media_change),
 744         NULL
 745 };
 746
 747 static struct attribute_group scsi_sdev_attr_group = {
 748         .attrs =        scsi_sdev_attrs,
 749 };
 750
 751 static struct attribute_group *scsi_sdev_attr_groups[] = {
 752         &scsi_sdev_attr_group,
 753         NULL
 754 };
 755
 756 static ssize_t
 757 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 758                           const char *buf, size_t count)
 759 {
 760         int depth, retval;
 761         struct scsi_device *sdev = to_scsi_device(dev);
 762         struct scsi_host_template *sht = sdev->host->hostt;
 763
 764         if (!sht->change_queue_depth)
 765                 return -EINVAL;
 766
 767         depth = simple_strtoul(buf, NULL, 0);
 768
 769         if (depth < 1)
 770                 return -EINVAL;
 771
 772         retval = sht->change_queue_depth(sdev, depth);
 773         if (retval < 0)
 774                 return retval;
 775
 776         return count;
 777 }
 778
 779 static struct device_attribute sdev_attr_queue_depth_rw =
 780         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 781                sdev_store_queue_depth_rw);
 782
 783 static ssize_t
 784 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 785                          const char *buf, size_t count)
 786 {
 787         struct scsi_device *sdev = to_scsi_device(dev);
 788         struct scsi_host_template *sht = sdev->host->hostt;
 789         int tag_type = 0, retval;
 790         int prev_tag_type = scsi_get_tag_type(sdev);
 791
 792         if (!sdev->tagged_supported || !sht->change_queue_type)
 793                 return -EINVAL;
 794
 795         if (strncmp(buf, "ordered", 7) == 0)
 796                 tag_type = MSG_ORDERED_TAG;
 797         else if (strncmp(buf, "simple", 6) == 0)
 798                 tag_type = MSG_SIMPLE_TAG;
 799         else if (strncmp(buf, "none", 4) != 0)
 800                 return -EINVAL;
 801
 802         if (tag_type == prev_tag_type)
 803                 return count;
 804
 805         retval = sht->change_queue_type(sdev, tag_type);
 806         if (retval < 0)
 807                 return retval;
 808
 809         return count;
 810 }
 811
 812 static int scsi_target_add(struct scsi_target *starget)
 813 {
 814         int error;
 815
 816         if (starget->state != STARGET_CREATED)
 817                 return 0;
 818
 819         error = device_add(&starget->dev);
 820         if (error) {
 821                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 822                 get_device(&starget->dev);
 823                 scsi_target_reap(starget);
 824                 put_device(&starget->dev);
 825                 return error;
 826         }
 827         transport_add_device(&starget->dev);
 828         starget->state = STARGET_RUNNING;
 829
 830         return 0;
 831 }
 832
 833 static struct device_attribute sdev_attr_queue_type_rw =
 834         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 835                sdev_store_queue_type_rw);
 836
 837 /**
 838  * scsi_sysfs_add_sdev - add scsi device to sysfs
 839  * @sdev:       scsi_device to add
 840  *
 841  * Return value:
 842  *      0 on Success / non-zero on Failure
 843  **/
 844 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 845 {
 846         int error, i;
 847         struct request_queue *rq = sdev->request_queue;
 848         struct scsi_target *starget = sdev->sdev_target;
 849
 850         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 851                 return error;
 852
 853         error = scsi_target_add(starget);
 854         if (error)
 855                 return error;
 856
 857         transport_configure_device(&starget->dev);
 858         error = device_add(&sdev->sdev_gendev);
 859         if (error) {
 860                 put_device(sdev->sdev_gendev.parent);
 861                 printk(KERN_INFO "error 1\n");
 862                 return error;
 863         }
 864         error = device_add(&sdev->sdev_dev);
 865         if (error) {
 866                 printk(KERN_INFO "error 2\n");
 867                 goto clean_device;
 868         }
 869
 870         /* take a reference for the sdev_dev; this is
 871          * released by the sdev_class .release */
 872         get_device(&sdev->sdev_gendev);
 873
 874         /* create queue files, which may be writable, depending on the host */
 875         if (sdev->host->hostt->change_queue_depth)
 876                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 877         else
 878                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 879         if (error) {
 880                 __scsi_remove_device(sdev);
 881                 goto out;
 882         }
 883         if (sdev->host->hostt->change_queue_type)
 884                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 885         else
 886                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 887         if (error) {
 888                 __scsi_remove_device(sdev);
 889                 goto out;
 890         }
 891
 892         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 893
 894         if (error)
 895                 sdev_printk(KERN_INFO, sdev,
 896                             "Failed to register bsg queue, errno=%d\n", error);
 897
 898         /* we're treating error on bsg register as non-fatal, so pretend
 899          * nothing went wrong */
 900         error = 0;
 901
 902         /* add additional host specific attributes */
 903         if (sdev->host->hostt->sdev_attrs) {
 904                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 905                         error = device_create_file(&sdev->sdev_gendev,
 906                                         sdev->host->hostt->sdev_attrs[i]);
 907                         if (error) {
 908                                 __scsi_remove_device(sdev);
 909                                 goto out;
 910                         }
 911                 }
 912         }
 913
 914         transport_add_device(&sdev->sdev_gendev);
 915  out:
 916         return error;
 917
 918  clean_device:
 919         scsi_device_set_state(sdev, SDEV_CANCEL);
 920
 921         device_del(&sdev->sdev_gendev);
 922         transport_destroy_device(&sdev->sdev_gendev);
 923         put_device(&sdev->sdev_gendev);
 924
 925         return error;
 926 }
 927
 928 void __scsi_remove_device(struct scsi_device *sdev)
 929 {
 930         struct device *dev = &sdev->sdev_gendev;
 931
 932         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 933                 return;
 934
 935         bsg_unregister_queue(sdev->request_queue);
 936         device_unregister(&sdev->sdev_dev);
 937         transport_remove_device(dev);
 938         device_del(dev);
 939         scsi_device_set_state(sdev, SDEV_DEL);
 940         if (sdev->host->hostt->slave_destroy)
 941                 sdev->host->hostt->slave_destroy(sdev);
 942         transport_destroy_device(dev);
 943         put_device(dev);
 944 }
 945
 946 /**
 947  * scsi_remove_device - unregister a device from the scsi bus
 948  * @sdev:       scsi_device to unregister
 949  **/
 950 void scsi_remove_device(struct scsi_device *sdev)
 951 {
 952         struct Scsi_Host *shost = sdev->host;
 953
 954         mutex_lock(&shost->scan_mutex);
 955         __scsi_remove_device(sdev);
 956         mutex_unlock(&shost->scan_mutex);
 957 }
 958 EXPORT_SYMBOL(scsi_remove_device);
 959
 960 static void __scsi_remove_target(struct scsi_target *starget)
 961 {
 962         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 963         unsigned long flags;
 964         struct scsi_device *sdev;
 965
 966         spin_lock_irqsave(shost->host_lock, flags);
 967         starget->reap_ref++;
 968  restart:
 969         list_for_each_entry(sdev, &shost->__devices, siblings) {
 970                 if (sdev->channel != starget->channel ||
 971                     sdev->id != starget->id ||
 972                     sdev->sdev_state == SDEV_DEL)
 973                         continue;
 974                 spin_unlock_irqrestore(shost->host_lock, flags);
 975                 scsi_remove_device(sdev);
 976                 spin_lock_irqsave(shost->host_lock, flags);
 977                 goto restart;
 978         }
 979         spin_unlock_irqrestore(shost->host_lock, flags);
 980         scsi_target_reap(starget);
 981 }
 982
 983 static int __remove_child (struct device * dev, void * data)
 984 {
 985         if (scsi_is_target_device(dev))
 986                 __scsi_remove_target(to_scsi_target(dev));
 987         return 0;
 988 }
 989
 990 /**
 991  * scsi_remove_target - try to remove a target and all its devices
 992  * @dev: generic starget or parent of generic stargets to be removed
 993  *
 994  * Note: This is slightly racy.  It is possible that if the user
 995  * requests the addition of another device then the target won't be
 996  * removed.
 997  */
 998 void scsi_remove_target(struct device *dev)
 999 {
1000         struct device *rdev;
1001
1002         if (scsi_is_target_device(dev)) {
1003                 __scsi_remove_target(to_scsi_target(dev));
1004                 return;
1005         }
1006
1007         rdev = get_device(dev);
1008         device_for_each_child(dev, NULL, __remove_child);
1009         put_device(rdev);
1010 }
1011 EXPORT_SYMBOL(scsi_remove_target);
1012
1013 int scsi_register_driver(struct device_driver *drv)
1014 {
1015         drv->bus = &scsi_bus_type;
1016
1017         return driver_register(drv);
1018 }
1019 EXPORT_SYMBOL(scsi_register_driver);
1020
1021 int scsi_register_interface(struct class_interface *intf)
1022 {
1023         intf->class = &sdev_class;
1024
1025         return class_interface_register(intf);
1026 }
1027 EXPORT_SYMBOL(scsi_register_interface);
1028
1029 /**
1030  * scsi_sysfs_add_host - add scsi host to subsystem
1031  * @shost:     scsi host struct to add to subsystem
1032  * @dev:       parent struct device pointer
1033  **/
1034 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1035 {
1036         int error, i;
1037
1038         /* add host specific attributes */
1039         if (shost->hostt->shost_attrs) {
1040                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1041                         error = device_create_file(&shost->shost_dev,
1042                                         shost->hostt->shost_attrs[i]);
1043                         if (error)
1044                                 return error;
1045                 }
1046         }
1047
1048         transport_register_device(&shost->shost_gendev);
1049         transport_configure_device(&shost->shost_gendev);
1050         return 0;
1051 }
1052
1053 static struct device_type scsi_dev_type = {
1054         .name =         "scsi_device",
1055         .release =      scsi_device_dev_release,
1056         .groups =       scsi_sdev_attr_groups,
1057 };
1058
1059 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1060 {
1061         unsigned long flags;
1062         struct Scsi_Host *shost = sdev->host;
1063         struct scsi_target  *starget = sdev->sdev_target;
1064
1065         device_initialize(&sdev->sdev_gendev);
1066         sdev->sdev_gendev.bus = &scsi_bus_type;
1067         sdev->sdev_gendev.type = &scsi_dev_type;
1068         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1069                 sdev->host->host_no, sdev->channel, sdev->id,
1070                 sdev->lun);
1071
1072         device_initialize(&sdev->sdev_dev);
1073         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1074         sdev->sdev_dev.class = &sdev_class;
1075         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1076                  "%d:%d:%d:%d", sdev->host->host_no,
1077                  sdev->channel, sdev->id, sdev->lun);
1078         sdev->scsi_level = starget->scsi_level;
1079         transport_setup_device(&sdev->sdev_gendev);
1080         spin_lock_irqsave(shost->host_lock, flags);
1081         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1082         list_add_tail(&sdev->siblings, &shost->__devices);
1083         spin_unlock_irqrestore(shost->host_lock, flags);
1084 }
1085
1086 int scsi_is_sdev_device(const struct device *dev)
1087 {
1088         return dev->type == &scsi_dev_type;
1089 }
1090 EXPORT_SYMBOL(scsi_is_sdev_device);
1091
1092 /* A blank transport template that is used in drivers that don't
1093  * yet implement Transport Attributes */
1094 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };