SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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;
 363
 364         if (dev->type != &scsi_dev_type)
 365                 return 0;
 366
 367         sdev = to_scsi_device(dev);
 368
 369         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 370         return 0;
 371 }
 372
 373 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 374 {
 375         struct device_driver *drv;
 376         struct scsi_device *sdev;
 377         int err;
 378
 379         if (dev->type != &scsi_dev_type)
 380                 return 0;
 381
 382         drv = dev->driver;
 383         sdev = to_scsi_device(dev);
 384
 385         err = scsi_device_quiesce(sdev);
 386         if (err)
 387                 return err;
 388
 389         if (drv && drv->suspend) {
 390                 err = drv->suspend(dev, state);
 391                 if (err)
 392                         return err;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int scsi_bus_resume(struct device * dev)
 399 {
 400         struct device_driver *drv;
 401         struct scsi_device *sdev;
 402         int err = 0;
 403
 404         if (dev->type != &scsi_dev_type)
 405                 return 0;
 406
 407         drv = dev->driver;
 408         sdev = to_scsi_device(dev);
 409
 410         if (drv && drv->resume)
 411                 err = drv->resume(dev);
 412
 413         scsi_device_resume(sdev);
 414
 415         return err;
 416 }
 417
 418 static int scsi_bus_remove(struct device *dev)
 419 {
 420         struct device_driver *drv = dev->driver;
 421         struct scsi_device *sdev = to_scsi_device(dev);
 422         int err = 0;
 423
 424         /* reset the prep_fn back to the default since the
 425          * driver may have altered it and it's being removed */
 426         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
 427
 428         if (drv && drv->remove)
 429                 err = drv->remove(dev);
 430
 431         return 0;
 432 }
 433
 434 struct bus_type scsi_bus_type = {
 435         .name           = "scsi",
 436         .match          = scsi_bus_match,
 437         .uevent         = scsi_bus_uevent,
 438         .suspend        = scsi_bus_suspend,
 439         .resume         = scsi_bus_resume,
 440         .remove         = scsi_bus_remove,
 441 };
 442 EXPORT_SYMBOL_GPL(scsi_bus_type);
 443
 444 int scsi_sysfs_register(void)
 445 {
 446         int error;
 447
 448         error = bus_register(&scsi_bus_type);
 449         if (!error) {
 450                 error = class_register(&sdev_class);
 451                 if (error)
 452                         bus_unregister(&scsi_bus_type);
 453         }
 454
 455         return error;
 456 }
 457
 458 void scsi_sysfs_unregister(void)
 459 {
 460         class_unregister(&sdev_class);
 461         bus_unregister(&scsi_bus_type);
 462 }
 463
 464 /*
 465  * sdev_show_function: macro to create an attr function that can be used to
 466  * show a non-bit field.
 467  */
 468 #define sdev_show_function(field, format_string)                                \
 469 static ssize_t                                                          \
 470 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 471                    char *buf)                                           \
 472 {                                                                       \
 473         struct scsi_device *sdev;                                       \
 474         sdev = to_scsi_device(dev);                                     \
 475         return snprintf (buf, 20, format_string, sdev->field);          \
 476 }                                                                       \
 477
 478 /*
 479  * sdev_rd_attr: macro to create a function and attribute variable for a
 480  * read only field.
 481  */
 482 #define sdev_rd_attr(field, format_string)                              \
 483         sdev_show_function(field, format_string)                        \
 484 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 485
 486
 487 /*
 488  * sdev_rd_attr: create a function and attribute variable for a
 489  * read/write field.
 490  */
 491 #define sdev_rw_attr(field, format_string)                              \
 492         sdev_show_function(field, format_string)                                \
 493                                                                         \
 494 static ssize_t                                                          \
 495 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 496                     const char *buf, size_t count)                      \
 497 {                                                                       \
 498         struct scsi_device *sdev;                                       \
 499         sdev = to_scsi_device(dev);                                     \
 500         snscanf (buf, 20, format_string, &sdev->field);                 \
 501         return count;                                                   \
 502 }                                                                       \
 503 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 504
 505 /* Currently we don't export bit fields, but we might in future,
 506  * so leave this code in */
 507 #if 0
 508 /*
 509  * sdev_rd_attr: create a function and attribute variable for a
 510  * read/write bit field.
 511  */
 512 #define sdev_rw_attr_bit(field)                                         \
 513         sdev_show_function(field, "%d\n")                                       \
 514                                                                         \
 515 static ssize_t                                                          \
 516 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 517                     const char *buf, size_t count)                      \
 518 {                                                                       \
 519         int ret;                                                        \
 520         struct scsi_device *sdev;                                       \
 521         ret = scsi_sdev_check_buf_bit(buf);                             \
 522         if (ret >= 0)   {                                               \
 523                 sdev = to_scsi_device(dev);                             \
 524                 sdev->field = ret;                                      \
 525                 ret = count;                                            \
 526         }                                                               \
 527         return ret;                                                     \
 528 }                                                                       \
 529 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 530
 531 /*
 532  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 533  * else return -EINVAL.
 534  */
 535 static int scsi_sdev_check_buf_bit(const char *buf)
 536 {
 537         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 538                 if (buf[0] == '1')
 539                         return 1;
 540                 else if (buf[0] == '0')
 541                         return 0;
 542                 else
 543                         return -EINVAL;
 544         } else
 545                 return -EINVAL;
 546 }
 547 #endif
 548 /*
 549  * Create the actual show/store functions and data structures.
 550  */
 551 sdev_rd_attr (device_blocked, "%d\n");
 552 sdev_rd_attr (queue_depth, "%d\n");
 553 sdev_rd_attr (type, "%d\n");
 554 sdev_rd_attr (scsi_level, "%d\n");
 555 sdev_rd_attr (vendor, "%.8s\n");
 556 sdev_rd_attr (model, "%.16s\n");
 557 sdev_rd_attr (rev, "%.4s\n");
 558
 559 static ssize_t
 560 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 561 {
 562         struct scsi_device *sdev;
 563         sdev = to_scsi_device(dev);
 564         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 565 }
 566
 567 static ssize_t
 568 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 569                     const char *buf, size_t count)
 570 {
 571         struct scsi_device *sdev;
 572         int timeout;
 573         sdev = to_scsi_device(dev);
 574         sscanf (buf, "%d\n", &timeout);
 575         sdev->timeout = timeout * HZ;
 576         return count;
 577 }
 578 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 579
 580 static ssize_t
 581 store_rescan_field (struct device *dev, struct device_attribute *attr,
 582                     const char *buf, size_t count)
 583 {
 584         scsi_rescan_device(dev);
 585         return count;
 586 }
 587 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 588
 589 static void sdev_store_delete_callback(struct device *dev)
 590 {
 591         scsi_remove_device(to_scsi_device(dev));
 592 }
 593
 594 static ssize_t
 595 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 596                   const char *buf, size_t count)
 597 {
 598         int rc;
 599
 600         /* An attribute cannot be unregistered by one of its own methods,
 601          * so we have to use this roundabout approach.
 602          */
 603         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 604         if (rc)
 605                 count = rc;
 606         return count;
 607 };
 608 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 609
 610 static ssize_t
 611 store_state_field(struct device *dev, struct device_attribute *attr,
 612                   const char *buf, size_t count)
 613 {
 614         int i;
 615         struct scsi_device *sdev = to_scsi_device(dev);
 616         enum scsi_device_state state = 0;
 617
 618         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 619                 const int len = strlen(sdev_states[i].name);
 620                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 621                    buf[len] == '\n') {
 622                         state = sdev_states[i].value;
 623                         break;
 624                 }
 625         }
 626         if (!state)
 627                 return -EINVAL;
 628
 629         if (scsi_device_set_state(sdev, state))
 630                 return -EINVAL;
 631         return count;
 632 }
 633
 634 static ssize_t
 635 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 636 {
 637         struct scsi_device *sdev = to_scsi_device(dev);
 638         const char *name = scsi_device_state_name(sdev->sdev_state);
 639
 640         if (!name)
 641                 return -EINVAL;
 642
 643         return snprintf(buf, 20, "%s\n", name);
 644 }
 645
 646 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 647
 648 static ssize_t
 649 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 650                       char *buf)
 651 {
 652         struct scsi_device *sdev = to_scsi_device(dev);
 653         const char *name = "none";
 654
 655         if (sdev->ordered_tags)
 656                 name = "ordered";
 657         else if (sdev->simple_tags)
 658                 name = "simple";
 659
 660         return snprintf(buf, 20, "%s\n", name);
 661 }
 662
 663 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 664
 665 static ssize_t
 666 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 667 {
 668         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 669 }
 670
 671 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 672
 673 #define show_sdev_iostat(field)                                         \
 674 static ssize_t                                                          \
 675 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 676                     char *buf)                                          \
 677 {                                                                       \
 678         struct scsi_device *sdev = to_scsi_device(dev);                 \
 679         unsigned long long count = atomic_read(&sdev->field);           \
 680         return snprintf(buf, 20, "0x%llx\n", count);                    \
 681 }                                                                       \
 682 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 683
 684 show_sdev_iostat(iorequest_cnt);
 685 show_sdev_iostat(iodone_cnt);
 686 show_sdev_iostat(ioerr_cnt);
 687
 688 static ssize_t
 689 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 690 {
 691         struct scsi_device *sdev;
 692         sdev = to_scsi_device(dev);
 693         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 694 }
 695 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 696
 697 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 698 static ssize_t                                                          \
 699 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 700                      char *buf)                                         \
 701 {                                                                       \
 702         struct scsi_device *sdev = to_scsi_device(dev);                 \
 703         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 704         return snprintf(buf, 20, "%d\n", val);                          \
 705 }
 706
 707 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 708 static ssize_t                                                          \
 709 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 710                       const char *buf, size_t count)                    \
 711 {                                                                       \
 712         struct scsi_device *sdev = to_scsi_device(dev);                 \
 713         int val = simple_strtoul(buf, NULL, 0);                         \
 714         if (val == 0)                                                   \
 715                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 716         else if (val == 1)                                              \
 717                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 718         else                                                            \
 719                 return -EINVAL;                                         \
 720         return count;                                                   \
 721 }
 722
 723 #define DECLARE_EVT(name, Cap_name)                                     \
 724         DECLARE_EVT_SHOW(name, Cap_name)                                \
 725         DECLARE_EVT_STORE(name, Cap_name)                               \
 726         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 727                            sdev_store_evt_##name);
 728 #define REF_EVT(name) &dev_attr_evt_##name.attr
 729
 730 DECLARE_EVT(media_change, MEDIA_CHANGE)
 731
 732 /* Default template for device attributes.  May NOT be modified */
 733 static struct attribute *scsi_sdev_attrs[] = {
 734         &dev_attr_device_blocked.attr,
 735         &dev_attr_type.attr,
 736         &dev_attr_scsi_level.attr,
 737         &dev_attr_vendor.attr,
 738         &dev_attr_model.attr,
 739         &dev_attr_rev.attr,
 740         &dev_attr_rescan.attr,
 741         &dev_attr_delete.attr,
 742         &dev_attr_state.attr,
 743         &dev_attr_timeout.attr,
 744         &dev_attr_iocounterbits.attr,
 745         &dev_attr_iorequest_cnt.attr,
 746         &dev_attr_iodone_cnt.attr,
 747         &dev_attr_ioerr_cnt.attr,
 748         &dev_attr_modalias.attr,
 749         REF_EVT(media_change),
 750         NULL
 751 };
 752
 753 static struct attribute_group scsi_sdev_attr_group = {
 754         .attrs =        scsi_sdev_attrs,
 755 };
 756
 757 static struct attribute_group *scsi_sdev_attr_groups[] = {
 758         &scsi_sdev_attr_group,
 759         NULL
 760 };
 761
 762 static ssize_t
 763 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 764                           const char *buf, size_t count)
 765 {
 766         int depth, retval;
 767         struct scsi_device *sdev = to_scsi_device(dev);
 768         struct scsi_host_template *sht = sdev->host->hostt;
 769
 770         if (!sht->change_queue_depth)
 771                 return -EINVAL;
 772
 773         depth = simple_strtoul(buf, NULL, 0);
 774
 775         if (depth < 1)
 776                 return -EINVAL;
 777
 778         retval = sht->change_queue_depth(sdev, depth);
 779         if (retval < 0)
 780                 return retval;
 781
 782         return count;
 783 }
 784
 785 static struct device_attribute sdev_attr_queue_depth_rw =
 786         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 787                sdev_store_queue_depth_rw);
 788
 789 static ssize_t
 790 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 791                          const char *buf, size_t count)
 792 {
 793         struct scsi_device *sdev = to_scsi_device(dev);
 794         struct scsi_host_template *sht = sdev->host->hostt;
 795         int tag_type = 0, retval;
 796         int prev_tag_type = scsi_get_tag_type(sdev);
 797
 798         if (!sdev->tagged_supported || !sht->change_queue_type)
 799                 return -EINVAL;
 800
 801         if (strncmp(buf, "ordered", 7) == 0)
 802                 tag_type = MSG_ORDERED_TAG;
 803         else if (strncmp(buf, "simple", 6) == 0)
 804                 tag_type = MSG_SIMPLE_TAG;
 805         else if (strncmp(buf, "none", 4) != 0)
 806                 return -EINVAL;
 807
 808         if (tag_type == prev_tag_type)
 809                 return count;
 810
 811         retval = sht->change_queue_type(sdev, tag_type);
 812         if (retval < 0)
 813                 return retval;
 814
 815         return count;
 816 }
 817
 818 static int scsi_target_add(struct scsi_target *starget)
 819 {
 820         int error;
 821
 822         if (starget->state != STARGET_CREATED)
 823                 return 0;
 824
 825         error = device_add(&starget->dev);
 826         if (error) {
 827                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 828                 get_device(&starget->dev);
 829                 scsi_target_reap(starget);
 830                 put_device(&starget->dev);
 831                 return error;
 832         }
 833         transport_add_device(&starget->dev);
 834         starget->state = STARGET_RUNNING;
 835
 836         return 0;
 837 }
 838
 839 static struct device_attribute sdev_attr_queue_type_rw =
 840         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 841                sdev_store_queue_type_rw);
 842
 843 /**
 844  * scsi_sysfs_add_sdev - add scsi device to sysfs
 845  * @sdev:       scsi_device to add
 846  *
 847  * Return value:
 848  *      0 on Success / non-zero on Failure
 849  **/
 850 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 851 {
 852         int error, i;
 853         struct request_queue *rq = sdev->request_queue;
 854         struct scsi_target *starget = sdev->sdev_target;
 855
 856         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 857                 return error;
 858
 859         error = scsi_target_add(starget);
 860         if (error)
 861                 return error;
 862
 863         transport_configure_device(&starget->dev);
 864         error = device_add(&sdev->sdev_gendev);
 865         if (error) {
 866                 put_device(sdev->sdev_gendev.parent);
 867                 printk(KERN_INFO "error 1\n");
 868                 return error;
 869         }
 870         error = device_add(&sdev->sdev_dev);
 871         if (error) {
 872                 printk(KERN_INFO "error 2\n");
 873                 goto clean_device;
 874         }
 875
 876         /* take a reference for the sdev_dev; this is
 877          * released by the sdev_class .release */
 878         get_device(&sdev->sdev_gendev);
 879
 880         /* create queue files, which may be writable, depending on the host */
 881         if (sdev->host->hostt->change_queue_depth)
 882                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 883         else
 884                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 885         if (error) {
 886                 __scsi_remove_device(sdev);
 887                 goto out;
 888         }
 889         if (sdev->host->hostt->change_queue_type)
 890                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 891         else
 892                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 893         if (error) {
 894                 __scsi_remove_device(sdev);
 895                 goto out;
 896         }
 897
 898         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 899
 900         if (error)
 901                 sdev_printk(KERN_INFO, sdev,
 902                             "Failed to register bsg queue, errno=%d\n", error);
 903
 904         /* we're treating error on bsg register as non-fatal, so pretend
 905          * nothing went wrong */
 906         error = 0;
 907
 908         /* add additional host specific attributes */
 909         if (sdev->host->hostt->sdev_attrs) {
 910                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 911                         error = device_create_file(&sdev->sdev_gendev,
 912                                         sdev->host->hostt->sdev_attrs[i]);
 913                         if (error) {
 914                                 __scsi_remove_device(sdev);
 915                                 goto out;
 916                         }
 917                 }
 918         }
 919
 920         transport_add_device(&sdev->sdev_gendev);
 921  out:
 922         return error;
 923
 924  clean_device:
 925         scsi_device_set_state(sdev, SDEV_CANCEL);
 926
 927         device_del(&sdev->sdev_gendev);
 928         transport_destroy_device(&sdev->sdev_gendev);
 929         put_device(&sdev->sdev_gendev);
 930
 931         return error;
 932 }
 933
 934 void __scsi_remove_device(struct scsi_device *sdev)
 935 {
 936         struct device *dev = &sdev->sdev_gendev;
 937
 938         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 939                 return;
 940
 941         bsg_unregister_queue(sdev->request_queue);
 942         device_unregister(&sdev->sdev_dev);
 943         transport_remove_device(dev);
 944         device_del(dev);
 945         scsi_device_set_state(sdev, SDEV_DEL);
 946         if (sdev->host->hostt->slave_destroy)
 947                 sdev->host->hostt->slave_destroy(sdev);
 948         transport_destroy_device(dev);
 949         put_device(dev);
 950 }
 951
 952 /**
 953  * scsi_remove_device - unregister a device from the scsi bus
 954  * @sdev:       scsi_device to unregister
 955  **/
 956 void scsi_remove_device(struct scsi_device *sdev)
 957 {
 958         struct Scsi_Host *shost = sdev->host;
 959
 960         mutex_lock(&shost->scan_mutex);
 961         __scsi_remove_device(sdev);
 962         mutex_unlock(&shost->scan_mutex);
 963 }
 964 EXPORT_SYMBOL(scsi_remove_device);
 965
 966 static void __scsi_remove_target(struct scsi_target *starget)
 967 {
 968         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 969         unsigned long flags;
 970         struct scsi_device *sdev;
 971
 972         spin_lock_irqsave(shost->host_lock, flags);
 973         starget->reap_ref++;
 974  restart:
 975         list_for_each_entry(sdev, &shost->__devices, siblings) {
 976                 if (sdev->channel != starget->channel ||
 977                     sdev->id != starget->id ||
 978                     sdev->sdev_state == SDEV_DEL)
 979                         continue;
 980                 spin_unlock_irqrestore(shost->host_lock, flags);
 981                 scsi_remove_device(sdev);
 982                 spin_lock_irqsave(shost->host_lock, flags);
 983                 goto restart;
 984         }
 985         spin_unlock_irqrestore(shost->host_lock, flags);
 986         scsi_target_reap(starget);
 987 }
 988
 989 static int __remove_child (struct device * dev, void * data)
 990 {
 991         if (scsi_is_target_device(dev))
 992                 __scsi_remove_target(to_scsi_target(dev));
 993         return 0;
 994 }
 995
 996 /**
 997  * scsi_remove_target - try to remove a target and all its devices
 998  * @dev: generic starget or parent of generic stargets to be removed
 999  *
1000  * Note: This is slightly racy.  It is possible that if the user
1001  * requests the addition of another device then the target won't be
1002  * removed.
1003  */
1004 void scsi_remove_target(struct device *dev)
1005 {
1006         struct device *rdev;
1007
1008         if (scsi_is_target_device(dev)) {
1009                 __scsi_remove_target(to_scsi_target(dev));
1010                 return;
1011         }
1012
1013         rdev = get_device(dev);
1014         device_for_each_child(dev, NULL, __remove_child);
1015         put_device(rdev);
1016 }
1017 EXPORT_SYMBOL(scsi_remove_target);
1018
1019 int scsi_register_driver(struct device_driver *drv)
1020 {
1021         drv->bus = &scsi_bus_type;
1022
1023         return driver_register(drv);
1024 }
1025 EXPORT_SYMBOL(scsi_register_driver);
1026
1027 int scsi_register_interface(struct class_interface *intf)
1028 {
1029         intf->class = &sdev_class;
1030
1031         return class_interface_register(intf);
1032 }
1033 EXPORT_SYMBOL(scsi_register_interface);
1034
1035 /**
1036  * scsi_sysfs_add_host - add scsi host to subsystem
1037  * @shost:     scsi host struct to add to subsystem
1038  * @dev:       parent struct device pointer
1039  **/
1040 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1041 {
1042         int error, i;
1043
1044         /* add host specific attributes */
1045         if (shost->hostt->shost_attrs) {
1046                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1047                         error = device_create_file(&shost->shost_dev,
1048                                         shost->hostt->shost_attrs[i]);
1049                         if (error)
1050                                 return error;
1051                 }
1052         }
1053
1054         transport_register_device(&shost->shost_gendev);
1055         transport_configure_device(&shost->shost_gendev);
1056         return 0;
1057 }
1058
1059 static struct device_type scsi_dev_type = {
1060         .name =         "scsi_device",
1061         .release =      scsi_device_dev_release,
1062         .groups =       scsi_sdev_attr_groups,
1063 };
1064
1065 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1066 {
1067         unsigned long flags;
1068         struct Scsi_Host *shost = sdev->host;
1069         struct scsi_target  *starget = sdev->sdev_target;
1070
1071         device_initialize(&sdev->sdev_gendev);
1072         sdev->sdev_gendev.bus = &scsi_bus_type;
1073         sdev->sdev_gendev.type = &scsi_dev_type;
1074         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1075                 sdev->host->host_no, sdev->channel, sdev->id,
1076                 sdev->lun);
1077
1078         device_initialize(&sdev->sdev_dev);
1079         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1080         sdev->sdev_dev.class = &sdev_class;
1081         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1082                  "%d:%d:%d:%d", sdev->host->host_no,
1083                  sdev->channel, sdev->id, sdev->lun);
1084         sdev->scsi_level = starget->scsi_level;
1085         transport_setup_device(&sdev->sdev_gendev);
1086         spin_lock_irqsave(shost->host_lock, flags);
1087         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1088         list_add_tail(&sdev->siblings, &shost->__devices);
1089         spin_unlock_irqrestore(shost->host_lock, flags);
1090 }
1091
1092 int scsi_is_sdev_device(const struct device *dev)
1093 {
1094         return dev->type == &scsi_dev_type;
1095 }
1096 EXPORT_SYMBOL(scsi_is_sdev_device);
1097
1098 /* A blank transport template that is used in drivers that don't
1099  * yet implement Transport Attributes */
1100 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };