drivers/scsi/scsi_sysfs.c

   1 /*
   2  * scsi_sysfs.c
   3  *
   4  * SCSI sysfs interface routines.
   5  *
   6  * Created to pull SCSI mid layer sysfs routines into one file.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/device.h>
  13
  14 #include <scsi/scsi.h>
  15 #include <scsi/scsi_device.h>
  16 #include <scsi/scsi_host.h>
  17 #include <scsi/scsi_tcq.h>
  18 #include <scsi/scsi_transport.h>
  19 #include <scsi/scsi_driver.h>
  20
  21 #include "scsi_priv.h"
  22 #include "scsi_logging.h"
  23
  24 static struct device_type scsi_dev_type;
  25
  26 static const struct {
  27         enum scsi_device_state  value;
  28         char                    *name;
  29 } sdev_states[] = {
  30         { SDEV_CREATED, "created" },
  31         { SDEV_RUNNING, "running" },
  32         { SDEV_CANCEL, "cancel" },
  33         { SDEV_DEL, "deleted" },
  34         { SDEV_QUIESCE, "quiesce" },
  35         { SDEV_OFFLINE, "offline" },
  36         { SDEV_BLOCK,   "blocked" },
  37         { SDEV_CREATED_BLOCK, "created-blocked" },
  38 };
  39
  40 const char *scsi_device_state_name(enum scsi_device_state state)
  41 {
  42         int i;
  43         char *name = NULL;
  44
  45         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  46                 if (sdev_states[i].value == state) {
  47                         name = sdev_states[i].name;
  48                         break;
  49                 }
  50         }
  51         return name;
  52 }
  53
  54 static const struct {
  55         enum scsi_host_state    value;
  56         char                    *name;
  57 } shost_states[] = {
  58         { SHOST_CREATED, "created" },
  59         { SHOST_RUNNING, "running" },
  60         { SHOST_CANCEL, "cancel" },
  61         { SHOST_DEL, "deleted" },
  62         { SHOST_RECOVERY, "recovery" },
  63         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  64         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  65 };
  66 const char *scsi_host_state_name(enum scsi_host_state state)
  67 {
  68         int i;
  69         char *name = NULL;
  70
  71         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  72                 if (shost_states[i].value == state) {
  73                         name = shost_states[i].name;
  74                         break;
  75                 }
  76         }
  77         return name;
  78 }
  79
  80 static int check_set(unsigned int *val, char *src)
  81 {
  82         char *last;
  83
  84         if (strncmp(src, "-", 20) == 0) {
  85                 *val = SCAN_WILD_CARD;
  86         } else {
  87                 /*
  88                  * Doesn't check for int overflow
  89                  */
  90                 *val = simple_strtoul(src, &last, 0);
  91                 if (*last != '\0')
  92                         return 1;
  93         }
  94         return 0;
  95 }
  96
  97 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  98 {
  99         char s1[15], s2[15], s3[15], junk;
 100         unsigned int channel, id, lun;
 101         int res;
 102
 103         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 104         if (res != 3)
 105                 return -EINVAL;
 106         if (check_set(&channel, s1))
 107                 return -EINVAL;
 108         if (check_set(&id, s2))
 109                 return -EINVAL;
 110         if (check_set(&lun, s3))
 111                 return -EINVAL;
 112         if (shost->transportt->user_scan)
 113                 res = shost->transportt->user_scan(shost, channel, id, lun);
 114         else
 115                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 116         return res;
 117 }
 118
 119 /*
 120  * shost_show_function: macro to create an attr function that can be used to
 121  * show a non-bit field.
 122  */
 123 #define shost_show_function(name, field, format_string)                 \
 124 static ssize_t                                                          \
 125 show_##name (struct device *dev, struct device_attribute *attr,         \
 126              char *buf)                                                 \
 127 {                                                                       \
 128         struct Scsi_Host *shost = class_to_shost(dev);                  \
 129         return snprintf (buf, 20, format_string, shost->field);         \
 130 }
 131
 132 /*
 133  * shost_rd_attr: macro to create a function and attribute variable for a
 134  * read only field.
 135  */
 136 #define shost_rd_attr2(name, field, format_string)                      \
 137         shost_show_function(name, field, format_string)                 \
 138 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 139
 140 #define shost_rd_attr(field, format_string) \
 141 shost_rd_attr2(field, field, format_string)
 142
 143 /*
 144  * Create the actual show/store functions and data structures.
 145  */
 146
 147 static ssize_t
 148 store_scan(struct device *dev, struct device_attribute *attr,
 149            const char *buf, size_t count)
 150 {
 151         struct Scsi_Host *shost = class_to_shost(dev);
 152         int res;
 153
 154         res = scsi_scan(shost, buf);
 155         if (res == 0)
 156                 res = count;
 157         return res;
 158 };
 159 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 160
 161 static ssize_t
 162 store_shost_state(struct device *dev, struct device_attribute *attr,
 163                   const char *buf, size_t count)
 164 {
 165         int i;
 166         struct Scsi_Host *shost = class_to_shost(dev);
 167         enum scsi_host_state state = 0;
 168
 169         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 170                 const int len = strlen(shost_states[i].name);
 171                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 172                    buf[len] == '\n') {
 173                         state = shost_states[i].value;
 174                         break;
 175                 }
 176         }
 177         if (!state)
 178                 return -EINVAL;
 179
 180         if (scsi_host_set_state(shost, state))
 181                 return -EINVAL;
 182         return count;
 183 }
 184
 185 static ssize_t
 186 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 187 {
 188         struct Scsi_Host *shost = class_to_shost(dev);
 189         const char *name = scsi_host_state_name(shost->shost_state);
 190
 191         if (!name)
 192                 return -EINVAL;
 193
 194         return snprintf(buf, 20, "%s\n", name);
 195 }
 196
 197 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 198 struct device_attribute dev_attr_hstate =
 199         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 200
 201 static ssize_t
 202 show_shost_mode(unsigned int mode, char *buf)
 203 {
 204         ssize_t len = 0;
 205
 206         if (mode & MODE_INITIATOR)
 207                 len = sprintf(buf, "%s", "Initiator");
 208
 209         if (mode & MODE_TARGET)
 210                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 211
 212         len += sprintf(buf + len, "\n");
 213
 214         return len;
 215 }
 216
 217 static ssize_t
 218 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 219                           char *buf)
 220 {
 221         struct Scsi_Host *shost = class_to_shost(dev);
 222         unsigned int supported_mode = shost->hostt->supported_mode;
 223
 224         if (supported_mode == MODE_UNKNOWN)
 225                 /* by default this should be initiator */
 226                 supported_mode = MODE_INITIATOR;
 227
 228         return show_shost_mode(supported_mode, buf);
 229 }
 230
 231 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 232
 233 static ssize_t
 234 show_shost_active_mode(struct device *dev,
 235                        struct device_attribute *attr, char *buf)
 236 {
 237         struct Scsi_Host *shost = class_to_shost(dev);
 238
 239         if (shost->active_mode == MODE_UNKNOWN)
 240                 return snprintf(buf, 20, "unknown\n");
 241         else
 242                 return show_shost_mode(shost->active_mode, buf);
 243 }
 244
 245 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 246
 247 shost_rd_attr(unique_id, "%u\n");
 248 shost_rd_attr(host_busy, "%hu\n");
 249 shost_rd_attr(cmd_per_lun, "%hd\n");
 250 shost_rd_attr(can_queue, "%hd\n");
 251 shost_rd_attr(sg_tablesize, "%hu\n");
 252 shost_rd_attr(unchecked_isa_dma, "%d\n");
 253 shost_rd_attr(prot_capabilities, "%u\n");
 254 shost_rd_attr(prot_guard_type, "%hd\n");
 255 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 256
 257 static struct attribute *scsi_sysfs_shost_attrs[] = {
 258         &dev_attr_unique_id.attr,
 259         &dev_attr_host_busy.attr,
 260         &dev_attr_cmd_per_lun.attr,
 261         &dev_attr_can_queue.attr,
 262         &dev_attr_sg_tablesize.attr,
 263         &dev_attr_unchecked_isa_dma.attr,
 264         &dev_attr_proc_name.attr,
 265         &dev_attr_scan.attr,
 266         &dev_attr_hstate.attr,
 267         &dev_attr_supported_mode.attr,
 268         &dev_attr_active_mode.attr,
 269         &dev_attr_prot_capabilities.attr,
 270         &dev_attr_prot_guard_type.attr,
 271         NULL
 272 };
 273
 274 struct attribute_group scsi_shost_attr_group = {
 275         .attrs =        scsi_sysfs_shost_attrs,
 276 };
 277
 278 struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 279         &scsi_shost_attr_group,
 280         NULL
 281 };
 282
 283 static void scsi_device_cls_release(struct device *class_dev)
 284 {
 285         struct scsi_device *sdev;
 286
 287         sdev = class_to_sdev(class_dev);
 288         put_device(&sdev->sdev_gendev);
 289 }
 290
 291 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 292 {
 293         struct scsi_device *sdev;
 294         struct device *parent;
 295         struct scsi_target *starget;
 296         struct list_head *this, *tmp;
 297         unsigned long flags;
 298
 299         sdev = container_of(work, struct scsi_device, ew.work);
 300
 301         parent = sdev->sdev_gendev.parent;
 302         starget = to_scsi_target(parent);
 303
 304         spin_lock_irqsave(sdev->host->host_lock, flags);
 305         starget->reap_ref++;
 306         list_del(&sdev->siblings);
 307         list_del(&sdev->same_target_siblings);
 308         list_del(&sdev->starved_entry);
 309         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 310
 311         cancel_work_sync(&sdev->event_work);
 312
 313         list_for_each_safe(this, tmp, &sdev->event_list) {
 314                 struct scsi_event *evt;
 315
 316                 evt = list_entry(this, struct scsi_event, node);
 317                 list_del(&evt->node);
 318                 kfree(evt);
 319         }
 320
 321         if (sdev->request_queue) {
 322                 sdev->request_queue->queuedata = NULL;
 323                 /* user context needed to free queue */
 324                 scsi_free_queue(sdev->request_queue);
 325                 /* temporary expedient, try to catch use of queue lock
 326                  * after free of sdev */
 327                 sdev->request_queue = NULL;
 328         }
 329
 330         scsi_target_reap(scsi_target(sdev));
 331
 332         kfree(sdev->inquiry);
 333         kfree(sdev);
 334
 335         if (parent)
 336                 put_device(parent);
 337 }
 338
 339 static void scsi_device_dev_release(struct device *dev)
 340 {
 341         struct scsi_device *sdp = to_scsi_device(dev);
 342         execute_in_process_context(scsi_device_dev_release_usercontext,
 343                                    &sdp->ew);
 344 }
 345
 346 static struct class sdev_class = {
 347         .name           = "scsi_device",
 348         .dev_release    = scsi_device_cls_release,
 349 };
 350
 351 /* all probing is done in the individual ->probe routines */
 352 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 353 {
 354         struct scsi_device *sdp;
 355
 356         if (dev->type != &scsi_dev_type)
 357                 return 0;
 358
 359         sdp = to_scsi_device(dev);
 360         if (sdp->no_uld_attach)
 361                 return 0;
 362         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 363 }
 364
 365 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 366 {
 367         struct scsi_device *sdev;
 368
 369         if (dev->type != &scsi_dev_type)
 370                 return 0;
 371
 372         sdev = to_scsi_device(dev);
 373
 374         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 375         return 0;
 376 }
 377
 378 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 379 {
 380         struct device_driver *drv;
 381         struct scsi_device *sdev;
 382         int err;
 383
 384         if (dev->type != &scsi_dev_type)
 385                 return 0;
 386
 387         drv = dev->driver;
 388         sdev = to_scsi_device(dev);
 389
 390         err = scsi_device_quiesce(sdev);
 391         if (err)
 392                 return err;
 393
 394         if (drv && drv->suspend) {
 395                 err = drv->suspend(dev, state);
 396                 if (err)
 397                         return err;
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int scsi_bus_resume(struct device * dev)
 404 {
 405         struct device_driver *drv;
 406         struct scsi_device *sdev;
 407         int err = 0;
 408
 409         if (dev->type != &scsi_dev_type)
 410                 return 0;
 411
 412         drv = dev->driver;
 413         sdev = to_scsi_device(dev);
 414
 415         if (drv && drv->resume)
 416                 err = drv->resume(dev);
 417
 418         scsi_device_resume(sdev);
 419
 420         return err;
 421 }
 422
 423 struct bus_type scsi_bus_type = {
 424         .name           = "scsi",
 425         .match          = scsi_bus_match,
 426         .uevent         = scsi_bus_uevent,
 427         .suspend        = scsi_bus_suspend,
 428         .resume         = scsi_bus_resume,
 429 };
 430 EXPORT_SYMBOL_GPL(scsi_bus_type);
 431
 432 int scsi_sysfs_register(void)
 433 {
 434         int error;
 435
 436         error = bus_register(&scsi_bus_type);
 437         if (!error) {
 438                 error = class_register(&sdev_class);
 439                 if (error)
 440                         bus_unregister(&scsi_bus_type);
 441         }
 442
 443         return error;
 444 }
 445
 446 void scsi_sysfs_unregister(void)
 447 {
 448         class_unregister(&sdev_class);
 449         bus_unregister(&scsi_bus_type);
 450 }
 451
 452 /*
 453  * sdev_show_function: macro to create an attr function that can be used to
 454  * show a non-bit field.
 455  */
 456 #define sdev_show_function(field, format_string)                                \
 457 static ssize_t                                                          \
 458 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 459                    char *buf)                                           \
 460 {                                                                       \
 461         struct scsi_device *sdev;                                       \
 462         sdev = to_scsi_device(dev);                                     \
 463         return snprintf (buf, 20, format_string, sdev->field);          \
 464 }                                                                       \
 465
 466 /*
 467  * sdev_rd_attr: macro to create a function and attribute variable for a
 468  * read only field.
 469  */
 470 #define sdev_rd_attr(field, format_string)                              \
 471         sdev_show_function(field, format_string)                        \
 472 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 473
 474
 475 /*
 476  * sdev_rd_attr: create a function and attribute variable for a
 477  * read/write field.
 478  */
 479 #define sdev_rw_attr(field, format_string)                              \
 480         sdev_show_function(field, format_string)                                \
 481                                                                         \
 482 static ssize_t                                                          \
 483 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 484                     const char *buf, size_t count)                      \
 485 {                                                                       \
 486         struct scsi_device *sdev;                                       \
 487         sdev = to_scsi_device(dev);                                     \
 488         snscanf (buf, 20, format_string, &sdev->field);                 \
 489         return count;                                                   \
 490 }                                                                       \
 491 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 492
 493 /* Currently we don't export bit fields, but we might in future,
 494  * so leave this code in */
 495 #if 0
 496 /*
 497  * sdev_rd_attr: create a function and attribute variable for a
 498  * read/write bit field.
 499  */
 500 #define sdev_rw_attr_bit(field)                                         \
 501         sdev_show_function(field, "%d\n")                                       \
 502                                                                         \
 503 static ssize_t                                                          \
 504 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 505                     const char *buf, size_t count)                      \
 506 {                                                                       \
 507         int ret;                                                        \
 508         struct scsi_device *sdev;                                       \
 509         ret = scsi_sdev_check_buf_bit(buf);                             \
 510         if (ret >= 0)   {                                               \
 511                 sdev = to_scsi_device(dev);                             \
 512                 sdev->field = ret;                                      \
 513                 ret = count;                                            \
 514         }                                                               \
 515         return ret;                                                     \
 516 }                                                                       \
 517 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 518
 519 /*
 520  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 521  * else return -EINVAL.
 522  */
 523 static int scsi_sdev_check_buf_bit(const char *buf)
 524 {
 525         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 526                 if (buf[0] == '1')
 527                         return 1;
 528                 else if (buf[0] == '0')
 529                         return 0;
 530                 else
 531                         return -EINVAL;
 532         } else
 533                 return -EINVAL;
 534 }
 535 #endif
 536 /*
 537  * Create the actual show/store functions and data structures.
 538  */
 539 sdev_rd_attr (device_blocked, "%d\n");
 540 sdev_rd_attr (queue_depth, "%d\n");
 541 sdev_rd_attr (type, "%d\n");
 542 sdev_rd_attr (scsi_level, "%d\n");
 543 sdev_rd_attr (vendor, "%.8s\n");
 544 sdev_rd_attr (model, "%.16s\n");
 545 sdev_rd_attr (rev, "%.4s\n");
 546
 547 /*
 548  * TODO: can we make these symlinks to the block layer ones?
 549  */
 550 static ssize_t
 551 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 552 {
 553         struct scsi_device *sdev;
 554         sdev = to_scsi_device(dev);
 555         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 556 }
 557
 558 static ssize_t
 559 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 560                     const char *buf, size_t count)
 561 {
 562         struct scsi_device *sdev;
 563         int timeout;
 564         sdev = to_scsi_device(dev);
 565         sscanf (buf, "%d\n", &timeout);
 566         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 567         return count;
 568 }
 569 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 570
 571 static ssize_t
 572 store_rescan_field (struct device *dev, struct device_attribute *attr,
 573                     const char *buf, size_t count)
 574 {
 575         scsi_rescan_device(dev);
 576         return count;
 577 }
 578 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 579
 580 static void sdev_store_delete_callback(struct device *dev)
 581 {
 582         scsi_remove_device(to_scsi_device(dev));
 583 }
 584
 585 static ssize_t
 586 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 587                   const char *buf, size_t count)
 588 {
 589         int rc;
 590
 591         /* An attribute cannot be unregistered by one of its own methods,
 592          * so we have to use this roundabout approach.
 593          */
 594         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 595         if (rc)
 596                 count = rc;
 597         return count;
 598 };
 599 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 600
 601 static ssize_t
 602 store_state_field(struct device *dev, struct device_attribute *attr,
 603                   const char *buf, size_t count)
 604 {
 605         int i;
 606         struct scsi_device *sdev = to_scsi_device(dev);
 607         enum scsi_device_state state = 0;
 608
 609         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 610                 const int len = strlen(sdev_states[i].name);
 611                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 612                    buf[len] == '\n') {
 613                         state = sdev_states[i].value;
 614                         break;
 615                 }
 616         }
 617         if (!state)
 618                 return -EINVAL;
 619
 620         if (scsi_device_set_state(sdev, state))
 621                 return -EINVAL;
 622         return count;
 623 }
 624
 625 static ssize_t
 626 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 627 {
 628         struct scsi_device *sdev = to_scsi_device(dev);
 629         const char *name = scsi_device_state_name(sdev->sdev_state);
 630
 631         if (!name)
 632                 return -EINVAL;
 633
 634         return snprintf(buf, 20, "%s\n", name);
 635 }
 636
 637 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 638
 639 static ssize_t
 640 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 641                       char *buf)
 642 {
 643         struct scsi_device *sdev = to_scsi_device(dev);
 644         const char *name = "none";
 645
 646         if (sdev->ordered_tags)
 647                 name = "ordered";
 648         else if (sdev->simple_tags)
 649                 name = "simple";
 650
 651         return snprintf(buf, 20, "%s\n", name);
 652 }
 653
 654 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 655
 656 static ssize_t
 657 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 658 {
 659         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 660 }
 661
 662 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 663
 664 #define show_sdev_iostat(field)                                         \
 665 static ssize_t                                                          \
 666 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 667                     char *buf)                                          \
 668 {                                                                       \
 669         struct scsi_device *sdev = to_scsi_device(dev);                 \
 670         unsigned long long count = atomic_read(&sdev->field);           \
 671         return snprintf(buf, 20, "0x%llx\n", count);                    \
 672 }                                                                       \
 673 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 674
 675 show_sdev_iostat(iorequest_cnt);
 676 show_sdev_iostat(iodone_cnt);
 677 show_sdev_iostat(ioerr_cnt);
 678
 679 static ssize_t
 680 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 681 {
 682         struct scsi_device *sdev;
 683         sdev = to_scsi_device(dev);
 684         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 685 }
 686 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 687
 688 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 689 static ssize_t                                                          \
 690 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 691                      char *buf)                                         \
 692 {                                                                       \
 693         struct scsi_device *sdev = to_scsi_device(dev);                 \
 694         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 695         return snprintf(buf, 20, "%d\n", val);                          \
 696 }
 697
 698 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 699 static ssize_t                                                          \
 700 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 701                       const char *buf, size_t count)                    \
 702 {                                                                       \
 703         struct scsi_device *sdev = to_scsi_device(dev);                 \
 704         int val = simple_strtoul(buf, NULL, 0);                         \
 705         if (val == 0)                                                   \
 706                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 707         else if (val == 1)                                              \
 708                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 709         else                                                            \
 710                 return -EINVAL;                                         \
 711         return count;                                                   \
 712 }
 713
 714 #define DECLARE_EVT(name, Cap_name)                                     \
 715         DECLARE_EVT_SHOW(name, Cap_name)                                \
 716         DECLARE_EVT_STORE(name, Cap_name)                               \
 717         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 718                            sdev_store_evt_##name);
 719 #define REF_EVT(name) &dev_attr_evt_##name.attr
 720
 721 DECLARE_EVT(media_change, MEDIA_CHANGE)
 722
 723 /* Default template for device attributes.  May NOT be modified */
 724 static struct attribute *scsi_sdev_attrs[] = {
 725         &dev_attr_device_blocked.attr,
 726         &dev_attr_type.attr,
 727         &dev_attr_scsi_level.attr,
 728         &dev_attr_vendor.attr,
 729         &dev_attr_model.attr,
 730         &dev_attr_rev.attr,
 731         &dev_attr_rescan.attr,
 732         &dev_attr_delete.attr,
 733         &dev_attr_state.attr,
 734         &dev_attr_timeout.attr,
 735         &dev_attr_iocounterbits.attr,
 736         &dev_attr_iorequest_cnt.attr,
 737         &dev_attr_iodone_cnt.attr,
 738         &dev_attr_ioerr_cnt.attr,
 739         &dev_attr_modalias.attr,
 740         REF_EVT(media_change),
 741         NULL
 742 };
 743
 744 static struct attribute_group scsi_sdev_attr_group = {
 745         .attrs =        scsi_sdev_attrs,
 746 };
 747
 748 static struct attribute_group *scsi_sdev_attr_groups[] = {
 749         &scsi_sdev_attr_group,
 750         NULL
 751 };
 752
 753 static ssize_t
 754 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 755                           const char *buf, size_t count)
 756 {
 757         int depth, retval;
 758         struct scsi_device *sdev = to_scsi_device(dev);
 759         struct scsi_host_template *sht = sdev->host->hostt;
 760
 761         if (!sht->change_queue_depth)
 762                 return -EINVAL;
 763
 764         depth = simple_strtoul(buf, NULL, 0);
 765
 766         if (depth < 1)
 767                 return -EINVAL;
 768
 769         retval = sht->change_queue_depth(sdev, depth);
 770         if (retval < 0)
 771                 return retval;
 772
 773         return count;
 774 }
 775
 776 static struct device_attribute sdev_attr_queue_depth_rw =
 777         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 778                sdev_store_queue_depth_rw);
 779
 780 static ssize_t
 781 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 782                          const char *buf, size_t count)
 783 {
 784         struct scsi_device *sdev = to_scsi_device(dev);
 785         struct scsi_host_template *sht = sdev->host->hostt;
 786         int tag_type = 0, retval;
 787         int prev_tag_type = scsi_get_tag_type(sdev);
 788
 789         if (!sdev->tagged_supported || !sht->change_queue_type)
 790                 return -EINVAL;
 791
 792         if (strncmp(buf, "ordered", 7) == 0)
 793                 tag_type = MSG_ORDERED_TAG;
 794         else if (strncmp(buf, "simple", 6) == 0)
 795                 tag_type = MSG_SIMPLE_TAG;
 796         else if (strncmp(buf, "none", 4) != 0)
 797                 return -EINVAL;
 798
 799         if (tag_type == prev_tag_type)
 800                 return count;
 801
 802         retval = sht->change_queue_type(sdev, tag_type);
 803         if (retval < 0)
 804                 return retval;
 805
 806         return count;
 807 }
 808
 809 static int scsi_target_add(struct scsi_target *starget)
 810 {
 811         int error;
 812
 813         if (starget->state != STARGET_CREATED)
 814                 return 0;
 815
 816         error = device_add(&starget->dev);
 817         if (error) {
 818                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 819                 get_device(&starget->dev);
 820                 scsi_target_reap(starget);
 821                 put_device(&starget->dev);
 822                 return error;
 823         }
 824         transport_add_device(&starget->dev);
 825         starget->state = STARGET_RUNNING;
 826
 827         return 0;
 828 }
 829
 830 static struct device_attribute sdev_attr_queue_type_rw =
 831         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 832                sdev_store_queue_type_rw);
 833
 834 /**
 835  * scsi_sysfs_add_sdev - add scsi device to sysfs
 836  * @sdev:       scsi_device to add
 837  *
 838  * Return value:
 839  *      0 on Success / non-zero on Failure
 840  **/
 841 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 842 {
 843         int error, i;
 844         struct request_queue *rq = sdev->request_queue;
 845         struct scsi_target *starget = sdev->sdev_target;
 846
 847         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 848                 return error;
 849
 850         error = scsi_target_add(starget);
 851         if (error)
 852                 return error;
 853
 854         transport_configure_device(&starget->dev);
 855         error = device_add(&sdev->sdev_gendev);
 856         if (error) {
 857                 put_device(sdev->sdev_gendev.parent);
 858                 printk(KERN_INFO "error 1\n");
 859                 return error;
 860         }
 861         error = device_add(&sdev->sdev_dev);
 862         if (error) {
 863                 printk(KERN_INFO "error 2\n");
 864                 goto clean_device;
 865         }
 866
 867         /* take a reference for the sdev_dev; this is
 868          * released by the sdev_class .release */
 869         get_device(&sdev->sdev_gendev);
 870
 871         /* create queue files, which may be writable, depending on the host */
 872         if (sdev->host->hostt->change_queue_depth)
 873                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 874         else
 875                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 876         if (error) {
 877                 __scsi_remove_device(sdev);
 878                 goto out;
 879         }
 880         if (sdev->host->hostt->change_queue_type)
 881                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 882         else
 883                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 884         if (error) {
 885                 __scsi_remove_device(sdev);
 886                 goto out;
 887         }
 888
 889         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 890
 891         if (error)
 892                 sdev_printk(KERN_INFO, sdev,
 893                             "Failed to register bsg queue, errno=%d\n", error);
 894
 895         /* we're treating error on bsg register as non-fatal, so pretend
 896          * nothing went wrong */
 897         error = 0;
 898
 899         /* add additional host specific attributes */
 900         if (sdev->host->hostt->sdev_attrs) {
 901                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 902                         error = device_create_file(&sdev->sdev_gendev,
 903                                         sdev->host->hostt->sdev_attrs[i]);
 904                         if (error) {
 905                                 __scsi_remove_device(sdev);
 906                                 goto out;
 907                         }
 908                 }
 909         }
 910
 911         transport_add_device(&sdev->sdev_gendev);
 912  out:
 913         return error;
 914
 915  clean_device:
 916         scsi_device_set_state(sdev, SDEV_CANCEL);
 917
 918         device_del(&sdev->sdev_gendev);
 919         transport_destroy_device(&sdev->sdev_gendev);
 920         put_device(&sdev->sdev_gendev);
 921
 922         return error;
 923 }
 924
 925 void __scsi_remove_device(struct scsi_device *sdev)
 926 {
 927         struct device *dev = &sdev->sdev_gendev;
 928
 929         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 930                 return;
 931
 932         bsg_unregister_queue(sdev->request_queue);
 933         device_unregister(&sdev->sdev_dev);
 934         transport_remove_device(dev);
 935         device_del(dev);
 936         scsi_device_set_state(sdev, SDEV_DEL);
 937         if (sdev->host->hostt->slave_destroy)
 938                 sdev->host->hostt->slave_destroy(sdev);
 939         transport_destroy_device(dev);
 940         put_device(dev);
 941 }
 942
 943 /**
 944  * scsi_remove_device - unregister a device from the scsi bus
 945  * @sdev:       scsi_device to unregister
 946  **/
 947 void scsi_remove_device(struct scsi_device *sdev)
 948 {
 949         struct Scsi_Host *shost = sdev->host;
 950
 951         mutex_lock(&shost->scan_mutex);
 952         __scsi_remove_device(sdev);
 953         mutex_unlock(&shost->scan_mutex);
 954 }
 955 EXPORT_SYMBOL(scsi_remove_device);
 956
 957 static void __scsi_remove_target(struct scsi_target *starget)
 958 {
 959         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 960         unsigned long flags;
 961         struct scsi_device *sdev;
 962
 963         spin_lock_irqsave(shost->host_lock, flags);
 964         starget->reap_ref++;
 965  restart:
 966         list_for_each_entry(sdev, &shost->__devices, siblings) {
 967                 if (sdev->channel != starget->channel ||
 968                     sdev->id != starget->id ||
 969                     sdev->sdev_state == SDEV_DEL)
 970                         continue;
 971                 spin_unlock_irqrestore(shost->host_lock, flags);
 972                 scsi_remove_device(sdev);
 973                 spin_lock_irqsave(shost->host_lock, flags);
 974                 goto restart;
 975         }
 976         spin_unlock_irqrestore(shost->host_lock, flags);
 977         scsi_target_reap(starget);
 978 }
 979
 980 static int __remove_child (struct device * dev, void * data)
 981 {
 982         if (scsi_is_target_device(dev))
 983                 __scsi_remove_target(to_scsi_target(dev));
 984         return 0;
 985 }
 986
 987 /**
 988  * scsi_remove_target - try to remove a target and all its devices
 989  * @dev: generic starget or parent of generic stargets to be removed
 990  *
 991  * Note: This is slightly racy.  It is possible that if the user
 992  * requests the addition of another device then the target won't be
 993  * removed.
 994  */
 995 void scsi_remove_target(struct device *dev)
 996 {
 997         struct device *rdev;
 998
 999         if (scsi_is_target_device(dev)) {
1000                 __scsi_remove_target(to_scsi_target(dev));
1001                 return;
1002         }
1003
1004         rdev = get_device(dev);
1005         device_for_each_child(dev, NULL, __remove_child);
1006         put_device(rdev);
1007 }
1008 EXPORT_SYMBOL(scsi_remove_target);
1009
1010 int scsi_register_driver(struct device_driver *drv)
1011 {
1012         drv->bus = &scsi_bus_type;
1013
1014         return driver_register(drv);
1015 }
1016 EXPORT_SYMBOL(scsi_register_driver);
1017
1018 int scsi_register_interface(struct class_interface *intf)
1019 {
1020         intf->class = &sdev_class;
1021
1022         return class_interface_register(intf);
1023 }
1024 EXPORT_SYMBOL(scsi_register_interface);
1025
1026 /**
1027  * scsi_sysfs_add_host - add scsi host to subsystem
1028  * @shost:     scsi host struct to add to subsystem
1029  **/
1030 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1031 {
1032         int error, i;
1033
1034         /* add host specific attributes */
1035         if (shost->hostt->shost_attrs) {
1036                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1037                         error = device_create_file(&shost->shost_dev,
1038                                         shost->hostt->shost_attrs[i]);
1039                         if (error)
1040                                 return error;
1041                 }
1042         }
1043
1044         transport_register_device(&shost->shost_gendev);
1045         transport_configure_device(&shost->shost_gendev);
1046         return 0;
1047 }
1048
1049 static struct device_type scsi_dev_type = {
1050         .name =         "scsi_device",
1051         .release =      scsi_device_dev_release,
1052         .groups =       scsi_sdev_attr_groups,
1053 };
1054
1055 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1056 {
1057         unsigned long flags;
1058         struct Scsi_Host *shost = sdev->host;
1059         struct scsi_target  *starget = sdev->sdev_target;
1060
1061         device_initialize(&sdev->sdev_gendev);
1062         sdev->sdev_gendev.bus = &scsi_bus_type;
1063         sdev->sdev_gendev.type = &scsi_dev_type;
1064         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1065                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1066
1067         device_initialize(&sdev->sdev_dev);
1068         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1069         sdev->sdev_dev.class = &sdev_class;
1070         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1071                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1072         sdev->scsi_level = starget->scsi_level;
1073         transport_setup_device(&sdev->sdev_gendev);
1074         spin_lock_irqsave(shost->host_lock, flags);
1075         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1076         list_add_tail(&sdev->siblings, &shost->__devices);
1077         spin_unlock_irqrestore(shost->host_lock, flags);
1078 }
1079
1080 int scsi_is_sdev_device(const struct device *dev)
1081 {
1082         return dev->type == &scsi_dev_type;
1083 }
1084 EXPORT_SYMBOL(scsi_is_sdev_device);
1085
1086 /* A blank transport template that is used in drivers that don't
1087  * yet implement Transport Attributes */
1088 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };