linux/drivers/scsi/scsi_sysfs.c
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   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/slab.h>
  11#include <linux/init.h>
  12#include <linux/blkdev.h>
  13#include <linux/device.h>
  14#include <linux/pm_runtime.h>
  15
  16#include <scsi/scsi.h>
  17#include <scsi/scsi_device.h>
  18#include <scsi/scsi_host.h>
  19#include <scsi/scsi_tcq.h>
  20#include <scsi/scsi_transport.h>
  21#include <scsi/scsi_driver.h>
  22
  23#include "scsi_priv.h"
  24#include "scsi_logging.h"
  25
  26static struct device_type scsi_dev_type;
  27
  28static const struct {
  29        enum scsi_device_state  value;
  30        char                    *name;
  31} sdev_states[] = {
  32        { SDEV_CREATED, "created" },
  33        { SDEV_RUNNING, "running" },
  34        { SDEV_CANCEL, "cancel" },
  35        { SDEV_DEL, "deleted" },
  36        { SDEV_QUIESCE, "quiesce" },
  37        { SDEV_OFFLINE, "offline" },
  38        { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  39        { SDEV_BLOCK,   "blocked" },
  40        { SDEV_CREATED_BLOCK, "created-blocked" },
  41};
  42
  43const char *scsi_device_state_name(enum scsi_device_state state)
  44{
  45        int i;
  46        char *name = NULL;
  47
  48        for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  49                if (sdev_states[i].value == state) {
  50                        name = sdev_states[i].name;
  51                        break;
  52                }
  53        }
  54        return name;
  55}
  56
  57static const struct {
  58        enum scsi_host_state    value;
  59        char                    *name;
  60} shost_states[] = {
  61        { SHOST_CREATED, "created" },
  62        { SHOST_RUNNING, "running" },
  63        { SHOST_CANCEL, "cancel" },
  64        { SHOST_DEL, "deleted" },
  65        { SHOST_RECOVERY, "recovery" },
  66        { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  67        { SHOST_DEL_RECOVERY, "deleted/recovery", },
  68};
  69const char *scsi_host_state_name(enum scsi_host_state state)
  70{
  71        int i;
  72        char *name = NULL;
  73
  74        for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  75                if (shost_states[i].value == state) {
  76                        name = shost_states[i].name;
  77                        break;
  78                }
  79        }
  80        return name;
  81}
  82
  83static int check_set(unsigned int *val, char *src)
  84{
  85        char *last;
  86
  87        if (strncmp(src, "-", 20) == 0) {
  88                *val = SCAN_WILD_CARD;
  89        } else {
  90                /*
  91                 * Doesn't check for int overflow
  92                 */
  93                *val = simple_strtoul(src, &last, 0);
  94                if (*last != '\0')
  95                        return 1;
  96        }
  97        return 0;
  98}
  99
 100static int scsi_scan(struct Scsi_Host *shost, const char *str)
 101{
 102        char s1[15], s2[15], s3[15], junk;
 103        unsigned int channel, id, lun;
 104        int res;
 105
 106        res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 107        if (res != 3)
 108                return -EINVAL;
 109        if (check_set(&channel, s1))
 110                return -EINVAL;
 111        if (check_set(&id, s2))
 112                return -EINVAL;
 113        if (check_set(&lun, s3))
 114                return -EINVAL;
 115        if (shost->transportt->user_scan)
 116                res = shost->transportt->user_scan(shost, channel, id, lun);
 117        else
 118                res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 119        return res;
 120}
 121
 122/*
 123 * shost_show_function: macro to create an attr function that can be used to
 124 * show a non-bit field.
 125 */
 126#define shost_show_function(name, field, format_string)                 \
 127static ssize_t                                                          \
 128show_##name (struct device *dev, struct device_attribute *attr,         \
 129             char *buf)                                                 \
 130{                                                                       \
 131        struct Scsi_Host *shost = class_to_shost(dev);                  \
 132        return snprintf (buf, 20, format_string, shost->field);         \
 133}
 134
 135/*
 136 * shost_rd_attr: macro to create a function and attribute variable for a
 137 * read only field.
 138 */
 139#define shost_rd_attr2(name, field, format_string)                      \
 140        shost_show_function(name, field, format_string)                 \
 141static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 142
 143#define shost_rd_attr(field, format_string) \
 144shost_rd_attr2(field, field, format_string)
 145
 146/*
 147 * Create the actual show/store functions and data structures.
 148 */
 149
 150static ssize_t
 151store_scan(struct device *dev, struct device_attribute *attr,
 152           const char *buf, size_t count)
 153{
 154        struct Scsi_Host *shost = class_to_shost(dev);
 155        int res;
 156
 157        res = scsi_scan(shost, buf);
 158        if (res == 0)
 159                res = count;
 160        return res;
 161};
 162static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 163
 164static ssize_t
 165store_shost_state(struct device *dev, struct device_attribute *attr,
 166                  const char *buf, size_t count)
 167{
 168        int i;
 169        struct Scsi_Host *shost = class_to_shost(dev);
 170        enum scsi_host_state state = 0;
 171
 172        for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 173                const int len = strlen(shost_states[i].name);
 174                if (strncmp(shost_states[i].name, buf, len) == 0 &&
 175                   buf[len] == '\n') {
 176                        state = shost_states[i].value;
 177                        break;
 178                }
 179        }
 180        if (!state)
 181                return -EINVAL;
 182
 183        if (scsi_host_set_state(shost, state))
 184                return -EINVAL;
 185        return count;
 186}
 187
 188static ssize_t
 189show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 190{
 191        struct Scsi_Host *shost = class_to_shost(dev);
 192        const char *name = scsi_host_state_name(shost->shost_state);
 193
 194        if (!name)
 195                return -EINVAL;
 196
 197        return snprintf(buf, 20, "%s\n", name);
 198}
 199
 200/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 201struct device_attribute dev_attr_hstate =
 202        __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 203
 204static ssize_t
 205show_shost_mode(unsigned int mode, char *buf)
 206{
 207        ssize_t len = 0;
 208
 209        if (mode & MODE_INITIATOR)
 210                len = sprintf(buf, "%s", "Initiator");
 211
 212        if (mode & MODE_TARGET)
 213                len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 214
 215        len += sprintf(buf + len, "\n");
 216
 217        return len;
 218}
 219
 220static ssize_t
 221show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 222                          char *buf)
 223{
 224        struct Scsi_Host *shost = class_to_shost(dev);
 225        unsigned int supported_mode = shost->hostt->supported_mode;
 226
 227        if (supported_mode == MODE_UNKNOWN)
 228                /* by default this should be initiator */
 229                supported_mode = MODE_INITIATOR;
 230
 231        return show_shost_mode(supported_mode, buf);
 232}
 233
 234static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 235
 236static ssize_t
 237show_shost_active_mode(struct device *dev,
 238                       struct device_attribute *attr, char *buf)
 239{
 240        struct Scsi_Host *shost = class_to_shost(dev);
 241
 242        if (shost->active_mode == MODE_UNKNOWN)
 243                return snprintf(buf, 20, "unknown\n");
 244        else
 245                return show_shost_mode(shost->active_mode, buf);
 246}
 247
 248static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 249
 250static int check_reset_type(const char *str)
 251{
 252        if (sysfs_streq(str, "adapter"))
 253                return SCSI_ADAPTER_RESET;
 254        else if (sysfs_streq(str, "firmware"))
 255                return SCSI_FIRMWARE_RESET;
 256        else
 257                return 0;
 258}
 259
 260static ssize_t
 261store_host_reset(struct device *dev, struct device_attribute *attr,
 262                const char *buf, size_t count)
 263{
 264        struct Scsi_Host *shost = class_to_shost(dev);
 265        struct scsi_host_template *sht = shost->hostt;
 266        int ret = -EINVAL;
 267        int type;
 268
 269        type = check_reset_type(buf);
 270        if (!type)
 271                goto exit_store_host_reset;
 272
 273        if (sht->host_reset)
 274                ret = sht->host_reset(shost, type);
 275
 276exit_store_host_reset:
 277        if (ret == 0)
 278                ret = count;
 279        return ret;
 280}
 281
 282static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 283
 284shost_rd_attr(unique_id, "%u\n");
 285shost_rd_attr(host_busy, "%hu\n");
 286shost_rd_attr(cmd_per_lun, "%hd\n");
 287shost_rd_attr(can_queue, "%hd\n");
 288shost_rd_attr(sg_tablesize, "%hu\n");
 289shost_rd_attr(sg_prot_tablesize, "%hu\n");
 290shost_rd_attr(unchecked_isa_dma, "%d\n");
 291shost_rd_attr(prot_capabilities, "%u\n");
 292shost_rd_attr(prot_guard_type, "%hd\n");
 293shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 294
 295static struct attribute *scsi_sysfs_shost_attrs[] = {
 296        &dev_attr_unique_id.attr,
 297        &dev_attr_host_busy.attr,
 298        &dev_attr_cmd_per_lun.attr,
 299        &dev_attr_can_queue.attr,
 300        &dev_attr_sg_tablesize.attr,
 301        &dev_attr_sg_prot_tablesize.attr,
 302        &dev_attr_unchecked_isa_dma.attr,
 303        &dev_attr_proc_name.attr,
 304        &dev_attr_scan.attr,
 305        &dev_attr_hstate.attr,
 306        &dev_attr_supported_mode.attr,
 307        &dev_attr_active_mode.attr,
 308        &dev_attr_prot_capabilities.attr,
 309        &dev_attr_prot_guard_type.attr,
 310        &dev_attr_host_reset.attr,
 311        NULL
 312};
 313
 314struct attribute_group scsi_shost_attr_group = {
 315        .attrs =        scsi_sysfs_shost_attrs,
 316};
 317
 318const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 319        &scsi_shost_attr_group,
 320        NULL
 321};
 322
 323static void scsi_device_cls_release(struct device *class_dev)
 324{
 325        struct scsi_device *sdev;
 326
 327        sdev = class_to_sdev(class_dev);
 328        put_device(&sdev->sdev_gendev);
 329}
 330
 331static void scsi_device_dev_release_usercontext(struct work_struct *work)
 332{
 333        struct scsi_device *sdev;
 334        struct device *parent;
 335        struct scsi_target *starget;
 336        struct list_head *this, *tmp;
 337        unsigned long flags;
 338
 339        sdev = container_of(work, struct scsi_device, ew.work);
 340
 341        parent = sdev->sdev_gendev.parent;
 342        starget = to_scsi_target(parent);
 343
 344        spin_lock_irqsave(sdev->host->host_lock, flags);
 345        starget->reap_ref++;
 346        list_del(&sdev->siblings);
 347        list_del(&sdev->same_target_siblings);
 348        list_del(&sdev->starved_entry);
 349        spin_unlock_irqrestore(sdev->host->host_lock, flags);
 350
 351        cancel_work_sync(&sdev->event_work);
 352
 353        list_for_each_safe(this, tmp, &sdev->event_list) {
 354                struct scsi_event *evt;
 355
 356                evt = list_entry(this, struct scsi_event, node);
 357                list_del(&evt->node);
 358                kfree(evt);
 359        }
 360
 361        blk_put_queue(sdev->request_queue);
 362        /* NULL queue means the device can't be used */
 363        sdev->request_queue = NULL;
 364
 365        scsi_target_reap(scsi_target(sdev));
 366
 367        kfree(sdev->inquiry);
 368        kfree(sdev);
 369
 370        if (parent)
 371                put_device(parent);
 372}
 373
 374static void scsi_device_dev_release(struct device *dev)
 375{
 376        struct scsi_device *sdp = to_scsi_device(dev);
 377        execute_in_process_context(scsi_device_dev_release_usercontext,
 378                                   &sdp->ew);
 379}
 380
 381static struct class sdev_class = {
 382        .name           = "scsi_device",
 383        .dev_release    = scsi_device_cls_release,
 384};
 385
 386/* all probing is done in the individual ->probe routines */
 387static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 388{
 389        struct scsi_device *sdp;
 390
 391        if (dev->type != &scsi_dev_type)
 392                return 0;
 393
 394        sdp = to_scsi_device(dev);
 395        if (sdp->no_uld_attach)
 396                return 0;
 397        return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 398}
 399
 400static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 401{
 402        struct scsi_device *sdev;
 403
 404        if (dev->type != &scsi_dev_type)
 405                return 0;
 406
 407        sdev = to_scsi_device(dev);
 408
 409        add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 410        return 0;
 411}
 412
 413struct bus_type scsi_bus_type = {
 414        .name           = "scsi",
 415        .match          = scsi_bus_match,
 416        .uevent         = scsi_bus_uevent,
 417#ifdef CONFIG_PM
 418        .pm             = &scsi_bus_pm_ops,
 419#endif
 420};
 421EXPORT_SYMBOL_GPL(scsi_bus_type);
 422
 423int scsi_sysfs_register(void)
 424{
 425        int error;
 426
 427        error = bus_register(&scsi_bus_type);
 428        if (!error) {
 429                error = class_register(&sdev_class);
 430                if (error)
 431                        bus_unregister(&scsi_bus_type);
 432        }
 433
 434        return error;
 435}
 436
 437void scsi_sysfs_unregister(void)
 438{
 439        class_unregister(&sdev_class);
 440        bus_unregister(&scsi_bus_type);
 441}
 442
 443/*
 444 * sdev_show_function: macro to create an attr function that can be used to
 445 * show a non-bit field.
 446 */
 447#define sdev_show_function(field, format_string)                                \
 448static ssize_t                                                          \
 449sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 450                   char *buf)                                           \
 451{                                                                       \
 452        struct scsi_device *sdev;                                       \
 453        sdev = to_scsi_device(dev);                                     \
 454        return snprintf (buf, 20, format_string, sdev->field);          \
 455}                                                                       \
 456
 457/*
 458 * sdev_rd_attr: macro to create a function and attribute variable for a
 459 * read only field.
 460 */
 461#define sdev_rd_attr(field, format_string)                              \
 462        sdev_show_function(field, format_string)                        \
 463static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 464
 465
 466/*
 467 * sdev_rw_attr: create a function and attribute variable for a
 468 * read/write field.
 469 */
 470#define sdev_rw_attr(field, format_string)                              \
 471        sdev_show_function(field, format_string)                                \
 472                                                                        \
 473static ssize_t                                                          \
 474sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 475                    const char *buf, size_t count)                      \
 476{                                                                       \
 477        struct scsi_device *sdev;                                       \
 478        sdev = to_scsi_device(dev);                                     \
 479        sscanf (buf, format_string, &sdev->field);                      \
 480        return count;                                                   \
 481}                                                                       \
 482static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 483
 484/* Currently we don't export bit fields, but we might in future,
 485 * so leave this code in */
 486#if 0
 487/*
 488 * sdev_rd_attr: create a function and attribute variable for a
 489 * read/write bit field.
 490 */
 491#define sdev_rw_attr_bit(field)                                         \
 492        sdev_show_function(field, "%d\n")                                       \
 493                                                                        \
 494static ssize_t                                                          \
 495sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 496                    const char *buf, size_t count)                      \
 497{                                                                       \
 498        int ret;                                                        \
 499        struct scsi_device *sdev;                                       \
 500        ret = scsi_sdev_check_buf_bit(buf);                             \
 501        if (ret >= 0)   {                                               \
 502                sdev = to_scsi_device(dev);                             \
 503                sdev->field = ret;                                      \
 504                ret = count;                                            \
 505        }                                                               \
 506        return ret;                                                     \
 507}                                                                       \
 508static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 509
 510/*
 511 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 512 * else return -EINVAL.
 513 */
 514static int scsi_sdev_check_buf_bit(const char *buf)
 515{
 516        if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 517                if (buf[0] == '1')
 518                        return 1;
 519                else if (buf[0] == '0')
 520                        return 0;
 521                else 
 522                        return -EINVAL;
 523        } else
 524                return -EINVAL;
 525}
 526#endif
 527/*
 528 * Create the actual show/store functions and data structures.
 529 */
 530sdev_rd_attr (device_blocked, "%d\n");
 531sdev_rd_attr (queue_depth, "%d\n");
 532sdev_rd_attr (type, "%d\n");
 533sdev_rd_attr (scsi_level, "%d\n");
 534sdev_rd_attr (vendor, "%.8s\n");
 535sdev_rd_attr (model, "%.16s\n");
 536sdev_rd_attr (rev, "%.4s\n");
 537
 538/*
 539 * TODO: can we make these symlinks to the block layer ones?
 540 */
 541static ssize_t
 542sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 543{
 544        struct scsi_device *sdev;
 545        sdev = to_scsi_device(dev);
 546        return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 547}
 548
 549static ssize_t
 550sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 551                    const char *buf, size_t count)
 552{
 553        struct scsi_device *sdev;
 554        int timeout;
 555        sdev = to_scsi_device(dev);
 556        sscanf (buf, "%d\n", &timeout);
 557        blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 558        return count;
 559}
 560static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 561
 562static ssize_t
 563sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 564{
 565        struct scsi_device *sdev;
 566        sdev = to_scsi_device(dev);
 567        return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 568}
 569
 570static ssize_t
 571sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 572                    const char *buf, size_t count)
 573{
 574        struct scsi_device *sdev;
 575        unsigned int eh_timeout;
 576        int err;
 577
 578        if (!capable(CAP_SYS_ADMIN))
 579                return -EACCES;
 580
 581        sdev = to_scsi_device(dev);
 582        err = kstrtouint(buf, 10, &eh_timeout);
 583        if (err)
 584                return err;
 585        sdev->eh_timeout = eh_timeout * HZ;
 586
 587        return count;
 588}
 589static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 590
 591static ssize_t
 592store_rescan_field (struct device *dev, struct device_attribute *attr,
 593                    const char *buf, size_t count)
 594{
 595        scsi_rescan_device(dev);
 596        return count;
 597}
 598static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 599
 600static void sdev_store_delete_callback(struct device *dev)
 601{
 602        scsi_remove_device(to_scsi_device(dev));
 603}
 604
 605static ssize_t
 606sdev_store_delete(struct device *dev, struct device_attribute *attr,
 607                  const char *buf, size_t count)
 608{
 609        int rc;
 610
 611        /* An attribute cannot be unregistered by one of its own methods,
 612         * so we have to use this roundabout approach.
 613         */
 614        rc = device_schedule_callback(dev, sdev_store_delete_callback);
 615        if (rc)
 616                count = rc;
 617        return count;
 618};
 619static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 620
 621static ssize_t
 622store_state_field(struct device *dev, struct device_attribute *attr,
 623                  const char *buf, size_t count)
 624{
 625        int i;
 626        struct scsi_device *sdev = to_scsi_device(dev);
 627        enum scsi_device_state state = 0;
 628
 629        for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 630                const int len = strlen(sdev_states[i].name);
 631                if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 632                   buf[len] == '\n') {
 633                        state = sdev_states[i].value;
 634                        break;
 635                }
 636        }
 637        if (!state)
 638                return -EINVAL;
 639
 640        if (scsi_device_set_state(sdev, state))
 641                return -EINVAL;
 642        return count;
 643}
 644
 645static ssize_t
 646show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 647{
 648        struct scsi_device *sdev = to_scsi_device(dev);
 649        const char *name = scsi_device_state_name(sdev->sdev_state);
 650
 651        if (!name)
 652                return -EINVAL;
 653
 654        return snprintf(buf, 20, "%s\n", name);
 655}
 656
 657static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 658
 659static ssize_t
 660show_queue_type_field(struct device *dev, struct device_attribute *attr,
 661                      char *buf)
 662{
 663        struct scsi_device *sdev = to_scsi_device(dev);
 664        const char *name = "none";
 665
 666        if (sdev->ordered_tags)
 667                name = "ordered";
 668        else if (sdev->simple_tags)
 669                name = "simple";
 670
 671        return snprintf(buf, 20, "%s\n", name);
 672}
 673
 674static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 675
 676static ssize_t
 677show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 678{
 679        return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 680}
 681
 682static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 683
 684#define show_sdev_iostat(field)                                         \
 685static ssize_t                                                          \
 686show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 687                    char *buf)                                          \
 688{                                                                       \
 689        struct scsi_device *sdev = to_scsi_device(dev);                 \
 690        unsigned long long count = atomic_read(&sdev->field);           \
 691        return snprintf(buf, 20, "0x%llx\n", count);                    \
 692}                                                                       \
 693static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 694
 695show_sdev_iostat(iorequest_cnt);
 696show_sdev_iostat(iodone_cnt);
 697show_sdev_iostat(ioerr_cnt);
 698
 699static ssize_t
 700sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 701{
 702        struct scsi_device *sdev;
 703        sdev = to_scsi_device(dev);
 704        return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 705}
 706static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 707
 708#define DECLARE_EVT_SHOW(name, Cap_name)                                \
 709static ssize_t                                                          \
 710sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 711                     char *buf)                                         \
 712{                                                                       \
 713        struct scsi_device *sdev = to_scsi_device(dev);                 \
 714        int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 715        return snprintf(buf, 20, "%d\n", val);                          \
 716}
 717
 718#define DECLARE_EVT_STORE(name, Cap_name)                               \
 719static ssize_t                                                          \
 720sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 721                      const char *buf, size_t count)                    \
 722{                                                                       \
 723        struct scsi_device *sdev = to_scsi_device(dev);                 \
 724        int val = simple_strtoul(buf, NULL, 0);                         \
 725        if (val == 0)                                                   \
 726                clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 727        else if (val == 1)                                              \
 728                set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 729        else                                                            \
 730                return -EINVAL;                                         \
 731        return count;                                                   \
 732}
 733
 734#define DECLARE_EVT(name, Cap_name)                                     \
 735        DECLARE_EVT_SHOW(name, Cap_name)                                \
 736        DECLARE_EVT_STORE(name, Cap_name)                               \
 737        static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 738                           sdev_store_evt_##name);
 739#define REF_EVT(name) &dev_attr_evt_##name.attr
 740
 741DECLARE_EVT(media_change, MEDIA_CHANGE)
 742
 743/* Default template for device attributes.  May NOT be modified */
 744static struct attribute *scsi_sdev_attrs[] = {
 745        &dev_attr_device_blocked.attr,
 746        &dev_attr_type.attr,
 747        &dev_attr_scsi_level.attr,
 748        &dev_attr_vendor.attr,
 749        &dev_attr_model.attr,
 750        &dev_attr_rev.attr,
 751        &dev_attr_rescan.attr,
 752        &dev_attr_delete.attr,
 753        &dev_attr_state.attr,
 754        &dev_attr_timeout.attr,
 755        &dev_attr_eh_timeout.attr,
 756        &dev_attr_iocounterbits.attr,
 757        &dev_attr_iorequest_cnt.attr,
 758        &dev_attr_iodone_cnt.attr,
 759        &dev_attr_ioerr_cnt.attr,
 760        &dev_attr_modalias.attr,
 761        REF_EVT(media_change),
 762        NULL
 763};
 764
 765static struct attribute_group scsi_sdev_attr_group = {
 766        .attrs =        scsi_sdev_attrs,
 767};
 768
 769static const struct attribute_group *scsi_sdev_attr_groups[] = {
 770        &scsi_sdev_attr_group,
 771        NULL
 772};
 773
 774static ssize_t
 775sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 776                          const char *buf, size_t count)
 777{
 778        int depth, retval;
 779        struct scsi_device *sdev = to_scsi_device(dev);
 780        struct scsi_host_template *sht = sdev->host->hostt;
 781
 782        if (!sht->change_queue_depth)
 783                return -EINVAL;
 784
 785        depth = simple_strtoul(buf, NULL, 0);
 786
 787        if (depth < 1)
 788                return -EINVAL;
 789
 790        retval = sht->change_queue_depth(sdev, depth,
 791                                         SCSI_QDEPTH_DEFAULT);
 792        if (retval < 0)
 793                return retval;
 794
 795        sdev->max_queue_depth = sdev->queue_depth;
 796
 797        return count;
 798}
 799
 800static struct device_attribute sdev_attr_queue_depth_rw =
 801        __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 802               sdev_store_queue_depth_rw);
 803
 804static ssize_t
 805sdev_show_queue_ramp_up_period(struct device *dev,
 806                               struct device_attribute *attr,
 807                               char *buf)
 808{
 809        struct scsi_device *sdev;
 810        sdev = to_scsi_device(dev);
 811        return snprintf(buf, 20, "%u\n",
 812                        jiffies_to_msecs(sdev->queue_ramp_up_period));
 813}
 814
 815static ssize_t
 816sdev_store_queue_ramp_up_period(struct device *dev,
 817                                struct device_attribute *attr,
 818                                const char *buf, size_t count)
 819{
 820        struct scsi_device *sdev = to_scsi_device(dev);
 821        unsigned long period;
 822
 823        if (strict_strtoul(buf, 10, &period))
 824                return -EINVAL;
 825
 826        sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 827        return period;
 828}
 829
 830static struct device_attribute sdev_attr_queue_ramp_up_period =
 831        __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 832               sdev_show_queue_ramp_up_period,
 833               sdev_store_queue_ramp_up_period);
 834
 835static ssize_t
 836sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 837                         const char *buf, size_t count)
 838{
 839        struct scsi_device *sdev = to_scsi_device(dev);
 840        struct scsi_host_template *sht = sdev->host->hostt;
 841        int tag_type = 0, retval;
 842        int prev_tag_type = scsi_get_tag_type(sdev);
 843
 844        if (!sdev->tagged_supported || !sht->change_queue_type)
 845                return -EINVAL;
 846
 847        if (strncmp(buf, "ordered", 7) == 0)
 848                tag_type = MSG_ORDERED_TAG;
 849        else if (strncmp(buf, "simple", 6) == 0)
 850                tag_type = MSG_SIMPLE_TAG;
 851        else if (strncmp(buf, "none", 4) != 0)
 852                return -EINVAL;
 853
 854        if (tag_type == prev_tag_type)
 855                return count;
 856
 857        retval = sht->change_queue_type(sdev, tag_type);
 858        if (retval < 0)
 859                return retval;
 860
 861        return count;
 862}
 863
 864static int scsi_target_add(struct scsi_target *starget)
 865{
 866        int error;
 867
 868        if (starget->state != STARGET_CREATED)
 869                return 0;
 870
 871        error = device_add(&starget->dev);
 872        if (error) {
 873                dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 874                return error;
 875        }
 876        transport_add_device(&starget->dev);
 877        starget->state = STARGET_RUNNING;
 878
 879        pm_runtime_set_active(&starget->dev);
 880        pm_runtime_enable(&starget->dev);
 881        device_enable_async_suspend(&starget->dev);
 882
 883        return 0;
 884}
 885
 886static struct device_attribute sdev_attr_queue_type_rw =
 887        __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 888               sdev_store_queue_type_rw);
 889
 890/**
 891 * scsi_sysfs_add_sdev - add scsi device to sysfs
 892 * @sdev:       scsi_device to add
 893 *
 894 * Return value:
 895 *      0 on Success / non-zero on Failure
 896 **/
 897int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 898{
 899        int error, i;
 900        struct request_queue *rq = sdev->request_queue;
 901        struct scsi_target *starget = sdev->sdev_target;
 902
 903        error = scsi_device_set_state(sdev, SDEV_RUNNING);
 904        if (error)
 905                return error;
 906
 907        error = scsi_target_add(starget);
 908        if (error)
 909                return error;
 910
 911        transport_configure_device(&starget->dev);
 912
 913        device_enable_async_suspend(&sdev->sdev_gendev);
 914        scsi_autopm_get_target(starget);
 915        pm_runtime_set_active(&sdev->sdev_gendev);
 916        pm_runtime_forbid(&sdev->sdev_gendev);
 917        pm_runtime_enable(&sdev->sdev_gendev);
 918        scsi_autopm_put_target(starget);
 919
 920        /* The following call will keep sdev active indefinitely, until
 921         * its driver does a corresponding scsi_autopm_pm_device().  Only
 922         * drivers supporting autosuspend will do this.
 923         */
 924        scsi_autopm_get_device(sdev);
 925
 926        error = device_add(&sdev->sdev_gendev);
 927        if (error) {
 928                sdev_printk(KERN_INFO, sdev,
 929                                "failed to add device: %d\n", error);
 930                return error;
 931        }
 932        device_enable_async_suspend(&sdev->sdev_dev);
 933        error = device_add(&sdev->sdev_dev);
 934        if (error) {
 935                sdev_printk(KERN_INFO, sdev,
 936                                "failed to add class device: %d\n", error);
 937                device_del(&sdev->sdev_gendev);
 938                return error;
 939        }
 940        transport_add_device(&sdev->sdev_gendev);
 941        sdev->is_visible = 1;
 942
 943        /* create queue files, which may be writable, depending on the host */
 944        if (sdev->host->hostt->change_queue_depth) {
 945                error = device_create_file(&sdev->sdev_gendev,
 946                                           &sdev_attr_queue_depth_rw);
 947                error = device_create_file(&sdev->sdev_gendev,
 948                                           &sdev_attr_queue_ramp_up_period);
 949        }
 950        else
 951                error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 952        if (error)
 953                return error;
 954
 955        if (sdev->host->hostt->change_queue_type)
 956                error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 957        else
 958                error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 959        if (error)
 960                return error;
 961
 962        error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 963
 964        if (error)
 965                /* we're treating error on bsg register as non-fatal,
 966                 * so pretend nothing went wrong */
 967                sdev_printk(KERN_INFO, sdev,
 968                            "Failed to register bsg queue, errno=%d\n", error);
 969
 970        /* add additional host specific attributes */
 971        if (sdev->host->hostt->sdev_attrs) {
 972                for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 973                        error = device_create_file(&sdev->sdev_gendev,
 974                                        sdev->host->hostt->sdev_attrs[i]);
 975                        if (error)
 976                                return error;
 977                }
 978        }
 979
 980        return error;
 981}
 982
 983void __scsi_remove_device(struct scsi_device *sdev)
 984{
 985        struct device *dev = &sdev->sdev_gendev;
 986
 987        if (sdev->is_visible) {
 988                if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 989                        return;
 990
 991                bsg_unregister_queue(sdev->request_queue);
 992                device_unregister(&sdev->sdev_dev);
 993                transport_remove_device(dev);
 994                device_del(dev);
 995        } else
 996                put_device(&sdev->sdev_dev);
 997
 998        /*
 999         * Stop accepting new requests and wait until all queuecommand() and
1000         * scsi_run_queue() invocations have finished before tearing down the
1001         * device.
1002         */
1003        scsi_device_set_state(sdev, SDEV_DEL);
1004        blk_cleanup_queue(sdev->request_queue);
1005        cancel_work_sync(&sdev->requeue_work);
1006
1007        if (sdev->host->hostt->slave_destroy)
1008                sdev->host->hostt->slave_destroy(sdev);
1009        transport_destroy_device(dev);
1010
1011        put_device(dev);
1012}
1013
1014/**
1015 * scsi_remove_device - unregister a device from the scsi bus
1016 * @sdev:       scsi_device to unregister
1017 **/
1018void scsi_remove_device(struct scsi_device *sdev)
1019{
1020        struct Scsi_Host *shost = sdev->host;
1021
1022        mutex_lock(&shost->scan_mutex);
1023        __scsi_remove_device(sdev);
1024        mutex_unlock(&shost->scan_mutex);
1025}
1026EXPORT_SYMBOL(scsi_remove_device);
1027
1028static void __scsi_remove_target(struct scsi_target *starget)
1029{
1030        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1031        unsigned long flags;
1032        struct scsi_device *sdev;
1033
1034        spin_lock_irqsave(shost->host_lock, flags);
1035 restart:
1036        list_for_each_entry(sdev, &shost->__devices, siblings) {
1037                if (sdev->channel != starget->channel ||
1038                    sdev->id != starget->id ||
1039                    scsi_device_get(sdev))
1040                        continue;
1041                spin_unlock_irqrestore(shost->host_lock, flags);
1042                scsi_remove_device(sdev);
1043                scsi_device_put(sdev);
1044                spin_lock_irqsave(shost->host_lock, flags);
1045                goto restart;
1046        }
1047        spin_unlock_irqrestore(shost->host_lock, flags);
1048}
1049
1050/**
1051 * scsi_remove_target - try to remove a target and all its devices
1052 * @dev: generic starget or parent of generic stargets to be removed
1053 *
1054 * Note: This is slightly racy.  It is possible that if the user
1055 * requests the addition of another device then the target won't be
1056 * removed.
1057 */
1058void scsi_remove_target(struct device *dev)
1059{
1060        struct Scsi_Host *shost = dev_to_shost(dev->parent);
1061        struct scsi_target *starget, *last = NULL;
1062        unsigned long flags;
1063
1064        /* remove targets being careful to lookup next entry before
1065         * deleting the last
1066         */
1067        spin_lock_irqsave(shost->host_lock, flags);
1068        list_for_each_entry(starget, &shost->__targets, siblings) {
1069                if (starget->state == STARGET_DEL)
1070                        continue;
1071                if (starget->dev.parent == dev || &starget->dev == dev) {
1072                        /* assuming new targets arrive at the end */
1073                        starget->reap_ref++;
1074                        spin_unlock_irqrestore(shost->host_lock, flags);
1075                        if (last)
1076                                scsi_target_reap(last);
1077                        last = starget;
1078                        __scsi_remove_target(starget);
1079                        spin_lock_irqsave(shost->host_lock, flags);
1080                }
1081        }
1082        spin_unlock_irqrestore(shost->host_lock, flags);
1083
1084        if (last)
1085                scsi_target_reap(last);
1086}
1087EXPORT_SYMBOL(scsi_remove_target);
1088
1089int scsi_register_driver(struct device_driver *drv)
1090{
1091        drv->bus = &scsi_bus_type;
1092
1093        return driver_register(drv);
1094}
1095EXPORT_SYMBOL(scsi_register_driver);
1096
1097int scsi_register_interface(struct class_interface *intf)
1098{
1099        intf->class = &sdev_class;
1100
1101        return class_interface_register(intf);
1102}
1103EXPORT_SYMBOL(scsi_register_interface);
1104
1105/**
1106 * scsi_sysfs_add_host - add scsi host to subsystem
1107 * @shost:     scsi host struct to add to subsystem
1108 **/
1109int scsi_sysfs_add_host(struct Scsi_Host *shost)
1110{
1111        int error, i;
1112
1113        /* add host specific attributes */
1114        if (shost->hostt->shost_attrs) {
1115                for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1116                        error = device_create_file(&shost->shost_dev,
1117                                        shost->hostt->shost_attrs[i]);
1118                        if (error)
1119                                return error;
1120                }
1121        }
1122
1123        transport_register_device(&shost->shost_gendev);
1124        transport_configure_device(&shost->shost_gendev);
1125        return 0;
1126}
1127
1128static struct device_type scsi_dev_type = {
1129        .name =         "scsi_device",
1130        .release =      scsi_device_dev_release,
1131        .groups =       scsi_sdev_attr_groups,
1132};
1133
1134void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1135{
1136        unsigned long flags;
1137        struct Scsi_Host *shost = sdev->host;
1138        struct scsi_target  *starget = sdev->sdev_target;
1139
1140        device_initialize(&sdev->sdev_gendev);
1141        sdev->sdev_gendev.bus = &scsi_bus_type;
1142        sdev->sdev_gendev.type = &scsi_dev_type;
1143        dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1144                     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1145
1146        device_initialize(&sdev->sdev_dev);
1147        sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1148        sdev->sdev_dev.class = &sdev_class;
1149        dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1150                     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1151        sdev->scsi_level = starget->scsi_level;
1152        transport_setup_device(&sdev->sdev_gendev);
1153        spin_lock_irqsave(shost->host_lock, flags);
1154        list_add_tail(&sdev->same_target_siblings, &starget->devices);
1155        list_add_tail(&sdev->siblings, &shost->__devices);
1156        spin_unlock_irqrestore(shost->host_lock, flags);
1157}
1158
1159int scsi_is_sdev_device(const struct device *dev)
1160{
1161        return dev->type == &scsi_dev_type;
1162}
1163EXPORT_SYMBOL(scsi_is_sdev_device);
1164
1165/* A blank transport template that is used in drivers that don't
1166 * yet implement Transport Attributes */
1167struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
1168
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