linux/drivers/scsi/scsi_transport_sas.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2005-2006 Dell Inc.
   4 *
   5 * Serial Attached SCSI (SAS) transport class.
   6 *
   7 * The SAS transport class contains common code to deal with SAS HBAs,
   8 * an aproximated representation of SAS topologies in the driver model,
   9 * and various sysfs attributes to expose these topologies and management
  10 * interfaces to userspace.
  11 *
  12 * In addition to the basic SCSI core objects this transport class
  13 * introduces two additional intermediate objects:  The SAS PHY
  14 * as represented by struct sas_phy defines an "outgoing" PHY on
  15 * a SAS HBA or Expander, and the SAS remote PHY represented by
  16 * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
  17 * end device.  Note that this is purely a software concept, the
  18 * underlying hardware for a PHY and a remote PHY is the exactly
  19 * the same.
  20 *
  21 * There is no concept of a SAS port in this code, users can see
  22 * what PHYs form a wide port based on the port_identifier attribute,
  23 * which is the same for all PHYs in a port.
  24 */
  25
  26#include <linux/init.h>
  27#include <linux/module.h>
  28#include <linux/jiffies.h>
  29#include <linux/err.h>
  30#include <linux/slab.h>
  31#include <linux/string.h>
  32#include <linux/blkdev.h>
  33#include <linux/bsg.h>
  34
  35#include <scsi/scsi.h>
  36#include <scsi/scsi_cmnd.h>
  37#include <scsi/scsi_request.h>
  38#include <scsi/scsi_device.h>
  39#include <scsi/scsi_host.h>
  40#include <scsi/scsi_transport.h>
  41#include <scsi/scsi_transport_sas.h>
  42
  43#include "scsi_sas_internal.h"
  44struct sas_host_attrs {
  45        struct list_head rphy_list;
  46        struct mutex lock;
  47        struct request_queue *q;
  48        u32 next_target_id;
  49        u32 next_expander_id;
  50        int next_port_id;
  51};
  52#define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
  53
  54
  55/*
  56 * Hack to allow attributes of the same name in different objects.
  57 */
  58#define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  59        struct device_attribute dev_attr_##_prefix##_##_name = \
  60        __ATTR(_name,_mode,_show,_store)
  61
  62
  63/*
  64 * Pretty printing helpers
  65 */
  66
  67#define sas_bitfield_name_match(title, table)                   \
  68static ssize_t                                                  \
  69get_sas_##title##_names(u32 table_key, char *buf)               \
  70{                                                               \
  71        char *prefix = "";                                      \
  72        ssize_t len = 0;                                        \
  73        int i;                                                  \
  74                                                                \
  75        for (i = 0; i < ARRAY_SIZE(table); i++) {               \
  76                if (table[i].value & table_key) {               \
  77                        len += sprintf(buf + len, "%s%s",       \
  78                                prefix, table[i].name);         \
  79                        prefix = ", ";                          \
  80                }                                               \
  81        }                                                       \
  82        len += sprintf(buf + len, "\n");                        \
  83        return len;                                             \
  84}
  85
  86#define sas_bitfield_name_set(title, table)                     \
  87static ssize_t                                                  \
  88set_sas_##title##_names(u32 *table_key, const char *buf)        \
  89{                                                               \
  90        ssize_t len = 0;                                        \
  91        int i;                                                  \
  92                                                                \
  93        for (i = 0; i < ARRAY_SIZE(table); i++) {               \
  94                len = strlen(table[i].name);                    \
  95                if (strncmp(buf, table[i].name, len) == 0 &&    \
  96                    (buf[len] == '\n' || buf[len] == '\0')) {   \
  97                        *table_key = table[i].value;            \
  98                        return 0;                               \
  99                }                                               \
 100        }                                                       \
 101        return -EINVAL;                                         \
 102}
 103
 104#define sas_bitfield_name_search(title, table)                  \
 105static ssize_t                                                  \
 106get_sas_##title##_names(u32 table_key, char *buf)               \
 107{                                                               \
 108        ssize_t len = 0;                                        \
 109        int i;                                                  \
 110                                                                \
 111        for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 112                if (table[i].value == table_key) {              \
 113                        len += sprintf(buf + len, "%s",         \
 114                                table[i].name);                 \
 115                        break;                                  \
 116                }                                               \
 117        }                                                       \
 118        len += sprintf(buf + len, "\n");                        \
 119        return len;                                             \
 120}
 121
 122static struct {
 123        u32             value;
 124        char            *name;
 125} sas_device_type_names[] = {
 126        { SAS_PHY_UNUSED,               "unused" },
 127        { SAS_END_DEVICE,               "end device" },
 128        { SAS_EDGE_EXPANDER_DEVICE,     "edge expander" },
 129        { SAS_FANOUT_EXPANDER_DEVICE,   "fanout expander" },
 130};
 131sas_bitfield_name_search(device_type, sas_device_type_names)
 132
 133
 134static struct {
 135        u32             value;
 136        char            *name;
 137} sas_protocol_names[] = {
 138        { SAS_PROTOCOL_SATA,            "sata" },
 139        { SAS_PROTOCOL_SMP,             "smp" },
 140        { SAS_PROTOCOL_STP,             "stp" },
 141        { SAS_PROTOCOL_SSP,             "ssp" },
 142};
 143sas_bitfield_name_match(protocol, sas_protocol_names)
 144
 145static struct {
 146        u32             value;
 147        char            *name;
 148} sas_linkspeed_names[] = {
 149        { SAS_LINK_RATE_UNKNOWN,        "Unknown" },
 150        { SAS_PHY_DISABLED,             "Phy disabled" },
 151        { SAS_LINK_RATE_FAILED,         "Link Rate failed" },
 152        { SAS_SATA_SPINUP_HOLD,         "Spin-up hold" },
 153        { SAS_LINK_RATE_1_5_GBPS,       "1.5 Gbit" },
 154        { SAS_LINK_RATE_3_0_GBPS,       "3.0 Gbit" },
 155        { SAS_LINK_RATE_6_0_GBPS,       "6.0 Gbit" },
 156        { SAS_LINK_RATE_12_0_GBPS,      "12.0 Gbit" },
 157};
 158sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 159sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
 160
 161static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
 162{
 163        struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
 164        struct sas_end_device *rdev;
 165
 166        BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
 167
 168        rdev = rphy_to_end_device(rphy);
 169        return rdev;
 170}
 171
 172static int sas_smp_dispatch(struct bsg_job *job)
 173{
 174        struct Scsi_Host *shost = dev_to_shost(job->dev);
 175        struct sas_rphy *rphy = NULL;
 176
 177        if (!scsi_is_host_device(job->dev))
 178                rphy = dev_to_rphy(job->dev);
 179
 180        if (!job->reply_payload.payload_len) {
 181                dev_warn(job->dev, "space for a smp response is missing\n");
 182                bsg_job_done(job, -EINVAL, 0);
 183                return 0;
 184        }
 185
 186        to_sas_internal(shost->transportt)->f->smp_handler(job, shost, rphy);
 187        return 0;
 188}
 189
 190static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
 191{
 192        struct request_queue *q;
 193
 194        if (!to_sas_internal(shost->transportt)->f->smp_handler) {
 195                printk("%s can't handle SMP requests\n", shost->hostt->name);
 196                return 0;
 197        }
 198
 199        if (rphy) {
 200                q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev),
 201                                sas_smp_dispatch, NULL, 0);
 202                if (IS_ERR(q))
 203                        return PTR_ERR(q);
 204                rphy->q = q;
 205        } else {
 206                char name[20];
 207
 208                snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
 209                q = bsg_setup_queue(&shost->shost_gendev, name,
 210                                sas_smp_dispatch, NULL, 0);
 211                if (IS_ERR(q))
 212                        return PTR_ERR(q);
 213                to_sas_host_attrs(shost)->q = q;
 214        }
 215
 216        return 0;
 217}
 218
 219/*
 220 * SAS host attributes
 221 */
 222
 223static int sas_host_setup(struct transport_container *tc, struct device *dev,
 224                          struct device *cdev)
 225{
 226        struct Scsi_Host *shost = dev_to_shost(dev);
 227        struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 228
 229        INIT_LIST_HEAD(&sas_host->rphy_list);
 230        mutex_init(&sas_host->lock);
 231        sas_host->next_target_id = 0;
 232        sas_host->next_expander_id = 0;
 233        sas_host->next_port_id = 0;
 234
 235        if (sas_bsg_initialize(shost, NULL))
 236                dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
 237                           shost->host_no);
 238
 239        return 0;
 240}
 241
 242static int sas_host_remove(struct transport_container *tc, struct device *dev,
 243                           struct device *cdev)
 244{
 245        struct Scsi_Host *shost = dev_to_shost(dev);
 246        struct request_queue *q = to_sas_host_attrs(shost)->q;
 247
 248        bsg_remove_queue(q);
 249        return 0;
 250}
 251
 252static DECLARE_TRANSPORT_CLASS(sas_host_class,
 253                "sas_host", sas_host_setup, sas_host_remove, NULL);
 254
 255static int sas_host_match(struct attribute_container *cont,
 256                            struct device *dev)
 257{
 258        struct Scsi_Host *shost;
 259        struct sas_internal *i;
 260
 261        if (!scsi_is_host_device(dev))
 262                return 0;
 263        shost = dev_to_shost(dev);
 264
 265        if (!shost->transportt)
 266                return 0;
 267        if (shost->transportt->host_attrs.ac.class !=
 268                        &sas_host_class.class)
 269                return 0;
 270
 271        i = to_sas_internal(shost->transportt);
 272        return &i->t.host_attrs.ac == cont;
 273}
 274
 275static int do_sas_phy_delete(struct device *dev, void *data)
 276{
 277        int pass = (int)(unsigned long)data;
 278
 279        if (pass == 0 && scsi_is_sas_port(dev))
 280                sas_port_delete(dev_to_sas_port(dev));
 281        else if (pass == 1 && scsi_is_sas_phy(dev))
 282                sas_phy_delete(dev_to_phy(dev));
 283        return 0;
 284}
 285
 286/**
 287 * sas_remove_children  -  tear down a devices SAS data structures
 288 * @dev:        device belonging to the sas object
 289 *
 290 * Removes all SAS PHYs and remote PHYs for a given object
 291 */
 292void sas_remove_children(struct device *dev)
 293{
 294        device_for_each_child(dev, (void *)0, do_sas_phy_delete);
 295        device_for_each_child(dev, (void *)1, do_sas_phy_delete);
 296}
 297EXPORT_SYMBOL(sas_remove_children);
 298
 299/**
 300 * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
 301 * @shost:      Scsi Host that is torn down
 302 *
 303 * Removes all SAS PHYs and remote PHYs for a given Scsi_Host and remove the
 304 * Scsi_Host as well.
 305 *
 306 * Note: Do not call scsi_remove_host() on the Scsi_Host any more, as it is
 307 * already removed.
 308 */
 309void sas_remove_host(struct Scsi_Host *shost)
 310{
 311        sas_remove_children(&shost->shost_gendev);
 312        scsi_remove_host(shost);
 313}
 314EXPORT_SYMBOL(sas_remove_host);
 315
 316/**
 317 * sas_get_address - return the SAS address of the device
 318 * @sdev: scsi device
 319 *
 320 * Returns the SAS address of the scsi device
 321 */
 322u64 sas_get_address(struct scsi_device *sdev)
 323{
 324        struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 325
 326        return rdev->rphy.identify.sas_address;
 327}
 328EXPORT_SYMBOL(sas_get_address);
 329
 330/**
 331 * sas_tlr_supported - checking TLR bit in vpd 0x90
 332 * @sdev: scsi device struct
 333 *
 334 * Check Transport Layer Retries are supported or not.
 335 * If vpd page 0x90 is present, TRL is supported.
 336 *
 337 */
 338unsigned int
 339sas_tlr_supported(struct scsi_device *sdev)
 340{
 341        const int vpd_len = 32;
 342        struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 343        char *buffer = kzalloc(vpd_len, GFP_KERNEL);
 344        int ret = 0;
 345
 346        if (!buffer)
 347                goto out;
 348
 349        if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
 350                goto out;
 351
 352        /*
 353         * Magic numbers: the VPD Protocol page (0x90)
 354         * has a 4 byte header and then one entry per device port
 355         * the TLR bit is at offset 8 on each port entry
 356         * if we take the first port, that's at total offset 12
 357         */
 358        ret = buffer[12] & 0x01;
 359
 360 out:
 361        kfree(buffer);
 362        rdev->tlr_supported = ret;
 363        return ret;
 364
 365}
 366EXPORT_SYMBOL_GPL(sas_tlr_supported);
 367
 368/**
 369 * sas_disable_tlr - setting TLR flags
 370 * @sdev: scsi device struct
 371 *
 372 * Seting tlr_enabled flag to 0.
 373 *
 374 */
 375void
 376sas_disable_tlr(struct scsi_device *sdev)
 377{
 378        struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 379
 380        rdev->tlr_enabled = 0;
 381}
 382EXPORT_SYMBOL_GPL(sas_disable_tlr);
 383
 384/**
 385 * sas_enable_tlr - setting TLR flags
 386 * @sdev: scsi device struct
 387 *
 388 * Seting tlr_enabled flag 1.
 389 *
 390 */
 391void sas_enable_tlr(struct scsi_device *sdev)
 392{
 393        unsigned int tlr_supported = 0;
 394        tlr_supported  = sas_tlr_supported(sdev);
 395
 396        if (tlr_supported) {
 397                struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 398
 399                rdev->tlr_enabled = 1;
 400        }
 401
 402        return;
 403}
 404EXPORT_SYMBOL_GPL(sas_enable_tlr);
 405
 406unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
 407{
 408        struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 409        return rdev->tlr_enabled;
 410}
 411EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
 412
 413/*
 414 * SAS Phy attributes
 415 */
 416
 417#define sas_phy_show_simple(field, name, format_string, cast)           \
 418static ssize_t                                                          \
 419show_sas_phy_##name(struct device *dev,                                 \
 420                    struct device_attribute *attr, char *buf)           \
 421{                                                                       \
 422        struct sas_phy *phy = transport_class_to_phy(dev);              \
 423                                                                        \
 424        return snprintf(buf, 20, format_string, cast phy->field);       \
 425}
 426
 427#define sas_phy_simple_attr(field, name, format_string, type)           \
 428        sas_phy_show_simple(field, name, format_string, (type)) \
 429static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 430
 431#define sas_phy_show_protocol(field, name)                              \
 432static ssize_t                                                          \
 433show_sas_phy_##name(struct device *dev,                                 \
 434                    struct device_attribute *attr, char *buf)           \
 435{                                                                       \
 436        struct sas_phy *phy = transport_class_to_phy(dev);              \
 437                                                                        \
 438        if (!phy->field)                                                \
 439                return snprintf(buf, 20, "none\n");                     \
 440        return get_sas_protocol_names(phy->field, buf);         \
 441}
 442
 443#define sas_phy_protocol_attr(field, name)                              \
 444        sas_phy_show_protocol(field, name)                              \
 445static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 446
 447#define sas_phy_show_linkspeed(field)                                   \
 448static ssize_t                                                          \
 449show_sas_phy_##field(struct device *dev,                                \
 450                     struct device_attribute *attr, char *buf)          \
 451{                                                                       \
 452        struct sas_phy *phy = transport_class_to_phy(dev);              \
 453                                                                        \
 454        return get_sas_linkspeed_names(phy->field, buf);                \
 455}
 456
 457/* Fudge to tell if we're minimum or maximum */
 458#define sas_phy_store_linkspeed(field)                                  \
 459static ssize_t                                                          \
 460store_sas_phy_##field(struct device *dev,                               \
 461                      struct device_attribute *attr,                    \
 462                      const char *buf,  size_t count)                   \
 463{                                                                       \
 464        struct sas_phy *phy = transport_class_to_phy(dev);              \
 465        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 466        struct sas_internal *i = to_sas_internal(shost->transportt);    \
 467        u32 value;                                                      \
 468        struct sas_phy_linkrates rates = {0};                           \
 469        int error;                                                      \
 470                                                                        \
 471        error = set_sas_linkspeed_names(&value, buf);                   \
 472        if (error)                                                      \
 473                return error;                                           \
 474        rates.field = value;                                            \
 475        error = i->f->set_phy_speed(phy, &rates);                       \
 476                                                                        \
 477        return error ? error : count;                                   \
 478}
 479
 480#define sas_phy_linkspeed_rw_attr(field)                                \
 481        sas_phy_show_linkspeed(field)                                   \
 482        sas_phy_store_linkspeed(field)                                  \
 483static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,                \
 484        store_sas_phy_##field)
 485
 486#define sas_phy_linkspeed_attr(field)                                   \
 487        sas_phy_show_linkspeed(field)                                   \
 488static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 489
 490
 491#define sas_phy_show_linkerror(field)                                   \
 492static ssize_t                                                          \
 493show_sas_phy_##field(struct device *dev,                                \
 494                     struct device_attribute *attr, char *buf)          \
 495{                                                                       \
 496        struct sas_phy *phy = transport_class_to_phy(dev);              \
 497        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 498        struct sas_internal *i = to_sas_internal(shost->transportt);    \
 499        int error;                                                      \
 500                                                                        \
 501        error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;   \
 502        if (error)                                                      \
 503                return error;                                           \
 504        return snprintf(buf, 20, "%u\n", phy->field);                   \
 505}
 506
 507#define sas_phy_linkerror_attr(field)                                   \
 508        sas_phy_show_linkerror(field)                                   \
 509static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 510
 511
 512static ssize_t
 513show_sas_device_type(struct device *dev,
 514                     struct device_attribute *attr, char *buf)
 515{
 516        struct sas_phy *phy = transport_class_to_phy(dev);
 517
 518        if (!phy->identify.device_type)
 519                return snprintf(buf, 20, "none\n");
 520        return get_sas_device_type_names(phy->identify.device_type, buf);
 521}
 522static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 523
 524static ssize_t do_sas_phy_enable(struct device *dev,
 525                size_t count, int enable)
 526{
 527        struct sas_phy *phy = transport_class_to_phy(dev);
 528        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 529        struct sas_internal *i = to_sas_internal(shost->transportt);
 530        int error;
 531
 532        error = i->f->phy_enable(phy, enable);
 533        if (error)
 534                return error;
 535        phy->enabled = enable;
 536        return count;
 537};
 538
 539static ssize_t
 540store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 541                     const char *buf, size_t count)
 542{
 543        if (count < 1)
 544                return -EINVAL;
 545
 546        switch (buf[0]) {
 547        case '0':
 548                do_sas_phy_enable(dev, count, 0);
 549                break;
 550        case '1':
 551                do_sas_phy_enable(dev, count, 1);
 552                break;
 553        default:
 554                return -EINVAL;
 555        }
 556
 557        return count;
 558}
 559
 560static ssize_t
 561show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 562                    char *buf)
 563{
 564        struct sas_phy *phy = transport_class_to_phy(dev);
 565
 566        return snprintf(buf, 20, "%d", phy->enabled);
 567}
 568
 569static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
 570                         store_sas_phy_enable);
 571
 572static ssize_t
 573do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
 574{
 575        struct sas_phy *phy = transport_class_to_phy(dev);
 576        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 577        struct sas_internal *i = to_sas_internal(shost->transportt);
 578        int error;
 579
 580        error = i->f->phy_reset(phy, hard_reset);
 581        if (error)
 582                return error;
 583        phy->enabled = 1;
 584        return count;
 585};
 586
 587static ssize_t
 588store_sas_link_reset(struct device *dev, struct device_attribute *attr,
 589                     const char *buf, size_t count)
 590{
 591        return do_sas_phy_reset(dev, count, 0);
 592}
 593static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 594
 595static ssize_t
 596store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
 597                     const char *buf, size_t count)
 598{
 599        return do_sas_phy_reset(dev, count, 1);
 600}
 601static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 602
 603sas_phy_protocol_attr(identify.initiator_port_protocols,
 604                initiator_port_protocols);
 605sas_phy_protocol_attr(identify.target_port_protocols,
 606                target_port_protocols);
 607sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 608                unsigned long long);
 609sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 610sas_phy_linkspeed_attr(negotiated_linkrate);
 611sas_phy_linkspeed_attr(minimum_linkrate_hw);
 612sas_phy_linkspeed_rw_attr(minimum_linkrate);
 613sas_phy_linkspeed_attr(maximum_linkrate_hw);
 614sas_phy_linkspeed_rw_attr(maximum_linkrate);
 615sas_phy_linkerror_attr(invalid_dword_count);
 616sas_phy_linkerror_attr(running_disparity_error_count);
 617sas_phy_linkerror_attr(loss_of_dword_sync_count);
 618sas_phy_linkerror_attr(phy_reset_problem_count);
 619
 620static int sas_phy_setup(struct transport_container *tc, struct device *dev,
 621                         struct device *cdev)
 622{
 623        struct sas_phy *phy = dev_to_phy(dev);
 624        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 625        struct sas_internal *i = to_sas_internal(shost->transportt);
 626
 627        if (i->f->phy_setup)
 628                i->f->phy_setup(phy);
 629
 630        return 0;
 631}
 632
 633static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 634                "sas_phy", sas_phy_setup, NULL, NULL);
 635
 636static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 637{
 638        struct Scsi_Host *shost;
 639        struct sas_internal *i;
 640
 641        if (!scsi_is_sas_phy(dev))
 642                return 0;
 643        shost = dev_to_shost(dev->parent);
 644
 645        if (!shost->transportt)
 646                return 0;
 647        if (shost->transportt->host_attrs.ac.class !=
 648                        &sas_host_class.class)
 649                return 0;
 650
 651        i = to_sas_internal(shost->transportt);
 652        return &i->phy_attr_cont.ac == cont;
 653}
 654
 655static void sas_phy_release(struct device *dev)
 656{
 657        struct sas_phy *phy = dev_to_phy(dev);
 658        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 659        struct sas_internal *i = to_sas_internal(shost->transportt);
 660
 661        if (i->f->phy_release)
 662                i->f->phy_release(phy);
 663        put_device(dev->parent);
 664        kfree(phy);
 665}
 666
 667/**
 668 * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
 669 * @parent:     Parent device
 670 * @number:     Phy index
 671 *
 672 * Allocates an SAS PHY structure.  It will be added in the device tree
 673 * below the device specified by @parent, which has to be either a Scsi_Host
 674 * or sas_rphy.
 675 *
 676 * Returns:
 677 *      SAS PHY allocated or %NULL if the allocation failed.
 678 */
 679struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 680{
 681        struct Scsi_Host *shost = dev_to_shost(parent);
 682        struct sas_phy *phy;
 683
 684        phy = kzalloc(sizeof(*phy), GFP_KERNEL);
 685        if (!phy)
 686                return NULL;
 687
 688        phy->number = number;
 689        phy->enabled = 1;
 690
 691        device_initialize(&phy->dev);
 692        phy->dev.parent = get_device(parent);
 693        phy->dev.release = sas_phy_release;
 694        INIT_LIST_HEAD(&phy->port_siblings);
 695        if (scsi_is_sas_expander_device(parent)) {
 696                struct sas_rphy *rphy = dev_to_rphy(parent);
 697                dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
 698                        rphy->scsi_target_id, number);
 699        } else
 700                dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
 701
 702        transport_setup_device(&phy->dev);
 703
 704        return phy;
 705}
 706EXPORT_SYMBOL(sas_phy_alloc);
 707
 708/**
 709 * sas_phy_add  -  add a SAS PHY to the device hierarchy
 710 * @phy:        The PHY to be added
 711 *
 712 * Publishes a SAS PHY to the rest of the system.
 713 */
 714int sas_phy_add(struct sas_phy *phy)
 715{
 716        int error;
 717
 718        error = device_add(&phy->dev);
 719        if (!error) {
 720                transport_add_device(&phy->dev);
 721                transport_configure_device(&phy->dev);
 722        }
 723
 724        return error;
 725}
 726EXPORT_SYMBOL(sas_phy_add);
 727
 728/**
 729 * sas_phy_free  -  free a SAS PHY
 730 * @phy:        SAS PHY to free
 731 *
 732 * Frees the specified SAS PHY.
 733 *
 734 * Note:
 735 *   This function must only be called on a PHY that has not
 736 *   successfully been added using sas_phy_add().
 737 */
 738void sas_phy_free(struct sas_phy *phy)
 739{
 740        transport_destroy_device(&phy->dev);
 741        put_device(&phy->dev);
 742}
 743EXPORT_SYMBOL(sas_phy_free);
 744
 745/**
 746 * sas_phy_delete  -  remove SAS PHY
 747 * @phy:        SAS PHY to remove
 748 *
 749 * Removes the specified SAS PHY.  If the SAS PHY has an
 750 * associated remote PHY it is removed before.
 751 */
 752void
 753sas_phy_delete(struct sas_phy *phy)
 754{
 755        struct device *dev = &phy->dev;
 756
 757        /* this happens if the phy is still part of a port when deleted */
 758        BUG_ON(!list_empty(&phy->port_siblings));
 759
 760        transport_remove_device(dev);
 761        device_del(dev);
 762        transport_destroy_device(dev);
 763        put_device(dev);
 764}
 765EXPORT_SYMBOL(sas_phy_delete);
 766
 767/**
 768 * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
 769 * @dev:        device to check
 770 *
 771 * Returns:
 772 *      %1 if the device represents a SAS PHY, %0 else
 773 */
 774int scsi_is_sas_phy(const struct device *dev)
 775{
 776        return dev->release == sas_phy_release;
 777}
 778EXPORT_SYMBOL(scsi_is_sas_phy);
 779
 780/*
 781 * SAS Port attributes
 782 */
 783#define sas_port_show_simple(field, name, format_string, cast)          \
 784static ssize_t                                                          \
 785show_sas_port_##name(struct device *dev,                                \
 786                     struct device_attribute *attr, char *buf)          \
 787{                                                                       \
 788        struct sas_port *port = transport_class_to_sas_port(dev);       \
 789                                                                        \
 790        return snprintf(buf, 20, format_string, cast port->field);      \
 791}
 792
 793#define sas_port_simple_attr(field, name, format_string, type)          \
 794        sas_port_show_simple(field, name, format_string, (type))        \
 795static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
 796
 797sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
 798
 799static DECLARE_TRANSPORT_CLASS(sas_port_class,
 800                               "sas_port", NULL, NULL, NULL);
 801
 802static int sas_port_match(struct attribute_container *cont, struct device *dev)
 803{
 804        struct Scsi_Host *shost;
 805        struct sas_internal *i;
 806
 807        if (!scsi_is_sas_port(dev))
 808                return 0;
 809        shost = dev_to_shost(dev->parent);
 810
 811        if (!shost->transportt)
 812                return 0;
 813        if (shost->transportt->host_attrs.ac.class !=
 814                        &sas_host_class.class)
 815                return 0;
 816
 817        i = to_sas_internal(shost->transportt);
 818        return &i->port_attr_cont.ac == cont;
 819}
 820
 821
 822static void sas_port_release(struct device *dev)
 823{
 824        struct sas_port *port = dev_to_sas_port(dev);
 825
 826        BUG_ON(!list_empty(&port->phy_list));
 827
 828        put_device(dev->parent);
 829        kfree(port);
 830}
 831
 832static void sas_port_create_link(struct sas_port *port,
 833                                 struct sas_phy *phy)
 834{
 835        int res;
 836
 837        res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
 838                                dev_name(&phy->dev));
 839        if (res)
 840                goto err;
 841        res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
 842        if (res)
 843                goto err;
 844        return;
 845err:
 846        printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
 847               __func__, res);
 848}
 849
 850static void sas_port_delete_link(struct sas_port *port,
 851                                 struct sas_phy *phy)
 852{
 853        sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
 854        sysfs_remove_link(&phy->dev.kobj, "port");
 855}
 856
 857/** sas_port_alloc - allocate and initialize a SAS port structure
 858 *
 859 * @parent:     parent device
 860 * @port_id:    port number
 861 *
 862 * Allocates a SAS port structure.  It will be added to the device tree
 863 * below the device specified by @parent which must be either a Scsi_Host
 864 * or a sas_expander_device.
 865 *
 866 * Returns %NULL on error
 867 */
 868struct sas_port *sas_port_alloc(struct device *parent, int port_id)
 869{
 870        struct Scsi_Host *shost = dev_to_shost(parent);
 871        struct sas_port *port;
 872
 873        port = kzalloc(sizeof(*port), GFP_KERNEL);
 874        if (!port)
 875                return NULL;
 876
 877        port->port_identifier = port_id;
 878
 879        device_initialize(&port->dev);
 880
 881        port->dev.parent = get_device(parent);
 882        port->dev.release = sas_port_release;
 883
 884        mutex_init(&port->phy_list_mutex);
 885        INIT_LIST_HEAD(&port->phy_list);
 886
 887        if (scsi_is_sas_expander_device(parent)) {
 888                struct sas_rphy *rphy = dev_to_rphy(parent);
 889                dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
 890                             rphy->scsi_target_id, port->port_identifier);
 891        } else
 892                dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
 893                             port->port_identifier);
 894
 895        transport_setup_device(&port->dev);
 896
 897        return port;
 898}
 899EXPORT_SYMBOL(sas_port_alloc);
 900
 901/** sas_port_alloc_num - allocate and initialize a SAS port structure
 902 *
 903 * @parent:     parent device
 904 *
 905 * Allocates a SAS port structure and a number to go with it.  This
 906 * interface is really for adapters where the port number has no
 907 * meansing, so the sas class should manage them.  It will be added to
 908 * the device tree below the device specified by @parent which must be
 909 * either a Scsi_Host or a sas_expander_device.
 910 *
 911 * Returns %NULL on error
 912 */
 913struct sas_port *sas_port_alloc_num(struct device *parent)
 914{
 915        int index;
 916        struct Scsi_Host *shost = dev_to_shost(parent);
 917        struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 918
 919        /* FIXME: use idr for this eventually */
 920        mutex_lock(&sas_host->lock);
 921        if (scsi_is_sas_expander_device(parent)) {
 922                struct sas_rphy *rphy = dev_to_rphy(parent);
 923                struct sas_expander_device *exp = rphy_to_expander_device(rphy);
 924
 925                index = exp->next_port_id++;
 926        } else
 927                index = sas_host->next_port_id++;
 928        mutex_unlock(&sas_host->lock);
 929        return sas_port_alloc(parent, index);
 930}
 931EXPORT_SYMBOL(sas_port_alloc_num);
 932
 933/**
 934 * sas_port_add - add a SAS port to the device hierarchy
 935 * @port:       port to be added
 936 *
 937 * publishes a port to the rest of the system
 938 */
 939int sas_port_add(struct sas_port *port)
 940{
 941        int error;
 942
 943        /* No phys should be added until this is made visible */
 944        BUG_ON(!list_empty(&port->phy_list));
 945
 946        error = device_add(&port->dev);
 947
 948        if (error)
 949                return error;
 950
 951        transport_add_device(&port->dev);
 952        transport_configure_device(&port->dev);
 953
 954        return 0;
 955}
 956EXPORT_SYMBOL(sas_port_add);
 957
 958/**
 959 * sas_port_free  -  free a SAS PORT
 960 * @port:       SAS PORT to free
 961 *
 962 * Frees the specified SAS PORT.
 963 *
 964 * Note:
 965 *   This function must only be called on a PORT that has not
 966 *   successfully been added using sas_port_add().
 967 */
 968void sas_port_free(struct sas_port *port)
 969{
 970        transport_destroy_device(&port->dev);
 971        put_device(&port->dev);
 972}
 973EXPORT_SYMBOL(sas_port_free);
 974
 975/**
 976 * sas_port_delete  -  remove SAS PORT
 977 * @port:       SAS PORT to remove
 978 *
 979 * Removes the specified SAS PORT.  If the SAS PORT has an
 980 * associated phys, unlink them from the port as well.
 981 */
 982void sas_port_delete(struct sas_port *port)
 983{
 984        struct device *dev = &port->dev;
 985        struct sas_phy *phy, *tmp_phy;
 986
 987        if (port->rphy) {
 988                sas_rphy_delete(port->rphy);
 989                port->rphy = NULL;
 990        }
 991
 992        mutex_lock(&port->phy_list_mutex);
 993        list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
 994                                 port_siblings) {
 995                sas_port_delete_link(port, phy);
 996                list_del_init(&phy->port_siblings);
 997        }
 998        mutex_unlock(&port->phy_list_mutex);
 999
1000        if (port->is_backlink) {
1001                struct device *parent = port->dev.parent;
1002
1003                sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1004                port->is_backlink = 0;
1005        }
1006
1007        transport_remove_device(dev);
1008        device_del(dev);
1009        transport_destroy_device(dev);
1010        put_device(dev);
1011}
1012EXPORT_SYMBOL(sas_port_delete);
1013
1014/**
1015 * scsi_is_sas_port -  check if a struct device represents a SAS port
1016 * @dev:        device to check
1017 *
1018 * Returns:
1019 *      %1 if the device represents a SAS Port, %0 else
1020 */
1021int scsi_is_sas_port(const struct device *dev)
1022{
1023        return dev->release == sas_port_release;
1024}
1025EXPORT_SYMBOL(scsi_is_sas_port);
1026
1027/**
1028 * sas_port_get_phy - try to take a reference on a port member
1029 * @port: port to check
1030 */
1031struct sas_phy *sas_port_get_phy(struct sas_port *port)
1032{
1033        struct sas_phy *phy;
1034
1035        mutex_lock(&port->phy_list_mutex);
1036        if (list_empty(&port->phy_list))
1037                phy = NULL;
1038        else {
1039                struct list_head *ent = port->phy_list.next;
1040
1041                phy = list_entry(ent, typeof(*phy), port_siblings);
1042                get_device(&phy->dev);
1043        }
1044        mutex_unlock(&port->phy_list_mutex);
1045
1046        return phy;
1047}
1048EXPORT_SYMBOL(sas_port_get_phy);
1049
1050/**
1051 * sas_port_add_phy - add another phy to a port to form a wide port
1052 * @port:       port to add the phy to
1053 * @phy:        phy to add
1054 *
1055 * When a port is initially created, it is empty (has no phys).  All
1056 * ports must have at least one phy to operated, and all wide ports
1057 * must have at least two.  The current code makes no difference
1058 * between ports and wide ports, but the only object that can be
1059 * connected to a remote device is a port, so ports must be formed on
1060 * all devices with phys if they're connected to anything.
1061 */
1062void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1063{
1064        mutex_lock(&port->phy_list_mutex);
1065        if (unlikely(!list_empty(&phy->port_siblings))) {
1066                /* make sure we're already on this port */
1067                struct sas_phy *tmp;
1068
1069                list_for_each_entry(tmp, &port->phy_list, port_siblings)
1070                        if (tmp == phy)
1071                                break;
1072                /* If this trips, you added a phy that was already
1073                 * part of a different port */
1074                if (unlikely(tmp != phy)) {
1075                        dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1076                                   dev_name(&phy->dev));
1077                        BUG();
1078                }
1079        } else {
1080                sas_port_create_link(port, phy);
1081                list_add_tail(&phy->port_siblings, &port->phy_list);
1082                port->num_phys++;
1083        }
1084        mutex_unlock(&port->phy_list_mutex);
1085}
1086EXPORT_SYMBOL(sas_port_add_phy);
1087
1088/**
1089 * sas_port_delete_phy - remove a phy from a port or wide port
1090 * @port:       port to remove the phy from
1091 * @phy:        phy to remove
1092 *
1093 * This operation is used for tearing down ports again.  It must be
1094 * done to every port or wide port before calling sas_port_delete.
1095 */
1096void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1097{
1098        mutex_lock(&port->phy_list_mutex);
1099        sas_port_delete_link(port, phy);
1100        list_del_init(&phy->port_siblings);
1101        port->num_phys--;
1102        mutex_unlock(&port->phy_list_mutex);
1103}
1104EXPORT_SYMBOL(sas_port_delete_phy);
1105
1106void sas_port_mark_backlink(struct sas_port *port)
1107{
1108        int res;
1109        struct device *parent = port->dev.parent->parent->parent;
1110
1111        if (port->is_backlink)
1112                return;
1113        port->is_backlink = 1;
1114        res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1115                                dev_name(parent));
1116        if (res)
1117                goto err;
1118        return;
1119err:
1120        printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1121               __func__, res);
1122
1123}
1124EXPORT_SYMBOL(sas_port_mark_backlink);
1125
1126/*
1127 * SAS remote PHY attributes.
1128 */
1129
1130#define sas_rphy_show_simple(field, name, format_string, cast)          \
1131static ssize_t                                                          \
1132show_sas_rphy_##name(struct device *dev,                                \
1133                     struct device_attribute *attr, char *buf)          \
1134{                                                                       \
1135        struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1136                                                                        \
1137        return snprintf(buf, 20, format_string, cast rphy->field);      \
1138}
1139
1140#define sas_rphy_simple_attr(field, name, format_string, type)          \
1141        sas_rphy_show_simple(field, name, format_string, (type))        \
1142static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,                     \
1143                show_sas_rphy_##name, NULL)
1144
1145#define sas_rphy_show_protocol(field, name)                             \
1146static ssize_t                                                          \
1147show_sas_rphy_##name(struct device *dev,                                \
1148                     struct device_attribute *attr, char *buf)          \
1149{                                                                       \
1150        struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1151                                                                        \
1152        if (!rphy->field)                                       \
1153                return snprintf(buf, 20, "none\n");                     \
1154        return get_sas_protocol_names(rphy->field, buf);        \
1155}
1156
1157#define sas_rphy_protocol_attr(field, name)                             \
1158        sas_rphy_show_protocol(field, name)                             \
1159static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,                     \
1160                show_sas_rphy_##name, NULL)
1161
1162static ssize_t
1163show_sas_rphy_device_type(struct device *dev,
1164                          struct device_attribute *attr, char *buf)
1165{
1166        struct sas_rphy *rphy = transport_class_to_rphy(dev);
1167
1168        if (!rphy->identify.device_type)
1169                return snprintf(buf, 20, "none\n");
1170        return get_sas_device_type_names(
1171                        rphy->identify.device_type, buf);
1172}
1173
1174static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1175                show_sas_rphy_device_type, NULL);
1176
1177static ssize_t
1178show_sas_rphy_enclosure_identifier(struct device *dev,
1179                                   struct device_attribute *attr, char *buf)
1180{
1181        struct sas_rphy *rphy = transport_class_to_rphy(dev);
1182        struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1183        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1184        struct sas_internal *i = to_sas_internal(shost->transportt);
1185        u64 identifier;
1186        int error;
1187
1188        error = i->f->get_enclosure_identifier(rphy, &identifier);
1189        if (error)
1190                return error;
1191        return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1192}
1193
1194static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1195                show_sas_rphy_enclosure_identifier, NULL);
1196
1197static ssize_t
1198show_sas_rphy_bay_identifier(struct device *dev,
1199                             struct device_attribute *attr, char *buf)
1200{
1201        struct sas_rphy *rphy = transport_class_to_rphy(dev);
1202        struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1203        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1204        struct sas_internal *i = to_sas_internal(shost->transportt);
1205        int val;
1206
1207        val = i->f->get_bay_identifier(rphy);
1208        if (val < 0)
1209                return val;
1210        return sprintf(buf, "%d\n", val);
1211}
1212
1213static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1214                show_sas_rphy_bay_identifier, NULL);
1215
1216sas_rphy_protocol_attr(identify.initiator_port_protocols,
1217                initiator_port_protocols);
1218sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1219sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1220                unsigned long long);
1221sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1222sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
1223
1224/* only need 8 bytes of data plus header (4 or 8) */
1225#define BUF_SIZE 64
1226
1227int sas_read_port_mode_page(struct scsi_device *sdev)
1228{
1229        char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1230        struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1231        struct scsi_mode_data mode_data;
1232        int res, error;
1233
1234        if (!buffer)
1235                return -ENOMEM;
1236
1237        res = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
1238                              &mode_data, NULL);
1239
1240        error = -EINVAL;
1241        if (!scsi_status_is_good(res))
1242                goto out;
1243
1244        msdata = buffer +  mode_data.header_length +
1245                mode_data.block_descriptor_length;
1246
1247        if (msdata - buffer > BUF_SIZE - 8)
1248                goto out;
1249
1250        error = 0;
1251
1252        rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1253        rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1254        rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1255
1256 out:
1257        kfree(buffer);
1258        return error;
1259}
1260EXPORT_SYMBOL(sas_read_port_mode_page);
1261
1262static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1263                               "sas_end_device", NULL, NULL, NULL);
1264
1265#define sas_end_dev_show_simple(field, name, format_string, cast)       \
1266static ssize_t                                                          \
1267show_sas_end_dev_##name(struct device *dev,                             \
1268                        struct device_attribute *attr, char *buf)       \
1269{                                                                       \
1270        struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1271        struct sas_end_device *rdev = rphy_to_end_device(rphy);         \
1272                                                                        \
1273        return snprintf(buf, 20, format_string, cast rdev->field);      \
1274}
1275
1276#define sas_end_dev_simple_attr(field, name, format_string, type)       \
1277        sas_end_dev_show_simple(field, name, format_string, (type))     \
1278static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO,                  \
1279                show_sas_end_dev_##name, NULL)
1280
1281sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1282sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1283                        "%d\n", int);
1284sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1285                        "%d\n", int);
1286sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1287                        "%d\n", int);
1288sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1289                        "%d\n", int);
1290
1291static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1292                               "sas_expander", NULL, NULL, NULL);
1293
1294#define sas_expander_show_simple(field, name, format_string, cast)      \
1295static ssize_t                                                          \
1296show_sas_expander_##name(struct device *dev,                            \
1297                         struct device_attribute *attr, char *buf)      \
1298{                                                                       \
1299        struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1300        struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1301                                                                        \
1302        return snprintf(buf, 20, format_string, cast edev->field);      \
1303}
1304
1305#define sas_expander_simple_attr(field, name, format_string, type)      \
1306        sas_expander_show_simple(field, name, format_string, (type))    \
1307static SAS_DEVICE_ATTR(expander, name, S_IRUGO,                         \
1308                show_sas_expander_##name, NULL)
1309
1310sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1311sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1312sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1313sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1314                         "%s\n", char *);
1315sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1316sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1317                         unsigned int);
1318sas_expander_simple_attr(level, level, "%d\n", int);
1319
1320static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1321                "sas_device", NULL, NULL, NULL);
1322
1323static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1324{
1325        struct Scsi_Host *shost;
1326        struct sas_internal *i;
1327
1328        if (!scsi_is_sas_rphy(dev))
1329                return 0;
1330        shost = dev_to_shost(dev->parent->parent);
1331
1332        if (!shost->transportt)
1333                return 0;
1334        if (shost->transportt->host_attrs.ac.class !=
1335                        &sas_host_class.class)
1336                return 0;
1337
1338        i = to_sas_internal(shost->transportt);
1339        return &i->rphy_attr_cont.ac == cont;
1340}
1341
1342static int sas_end_dev_match(struct attribute_container *cont,
1343                             struct device *dev)
1344{
1345        struct Scsi_Host *shost;
1346        struct sas_internal *i;
1347        struct sas_rphy *rphy;
1348
1349        if (!scsi_is_sas_rphy(dev))
1350                return 0;
1351        shost = dev_to_shost(dev->parent->parent);
1352        rphy = dev_to_rphy(dev);
1353
1354        if (!shost->transportt)
1355                return 0;
1356        if (shost->transportt->host_attrs.ac.class !=
1357                        &sas_host_class.class)
1358                return 0;
1359
1360        i = to_sas_internal(shost->transportt);
1361        return &i->end_dev_attr_cont.ac == cont &&
1362                rphy->identify.device_type == SAS_END_DEVICE;
1363}
1364
1365static int sas_expander_match(struct attribute_container *cont,
1366                              struct device *dev)
1367{
1368        struct Scsi_Host *shost;
1369        struct sas_internal *i;
1370        struct sas_rphy *rphy;
1371
1372        if (!scsi_is_sas_rphy(dev))
1373                return 0;
1374        shost = dev_to_shost(dev->parent->parent);
1375        rphy = dev_to_rphy(dev);
1376
1377        if (!shost->transportt)
1378                return 0;
1379        if (shost->transportt->host_attrs.ac.class !=
1380                        &sas_host_class.class)
1381                return 0;
1382
1383        i = to_sas_internal(shost->transportt);
1384        return &i->expander_attr_cont.ac == cont &&
1385                (rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1386                 rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1387}
1388
1389static void sas_expander_release(struct device *dev)
1390{
1391        struct sas_rphy *rphy = dev_to_rphy(dev);
1392        struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1393
1394        if (rphy->q)
1395                blk_cleanup_queue(rphy->q);
1396
1397        put_device(dev->parent);
1398        kfree(edev);
1399}
1400
1401static void sas_end_device_release(struct device *dev)
1402{
1403        struct sas_rphy *rphy = dev_to_rphy(dev);
1404        struct sas_end_device *edev = rphy_to_end_device(rphy);
1405
1406        if (rphy->q)
1407                blk_cleanup_queue(rphy->q);
1408
1409        put_device(dev->parent);
1410        kfree(edev);
1411}
1412
1413/**
1414 * sas_rphy_initialize - common rphy initialization
1415 * @rphy:       rphy to initialise
1416 *
1417 * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1418 * initialise the common rphy component of each.
1419 */
1420static void sas_rphy_initialize(struct sas_rphy *rphy)
1421{
1422        INIT_LIST_HEAD(&rphy->list);
1423}
1424
1425/**
1426 * sas_end_device_alloc - allocate an rphy for an end device
1427 * @parent: which port
1428 *
1429 * Allocates an SAS remote PHY structure, connected to @parent.
1430 *
1431 * Returns:
1432 *      SAS PHY allocated or %NULL if the allocation failed.
1433 */
1434struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1435{
1436        struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1437        struct sas_end_device *rdev;
1438
1439        rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1440        if (!rdev) {
1441                return NULL;
1442        }
1443
1444        device_initialize(&rdev->rphy.dev);
1445        rdev->rphy.dev.parent = get_device(&parent->dev);
1446        rdev->rphy.dev.release = sas_end_device_release;
1447        if (scsi_is_sas_expander_device(parent->dev.parent)) {
1448                struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1449                dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1450                             shost->host_no, rphy->scsi_target_id,
1451                             parent->port_identifier);
1452        } else
1453                dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1454                             shost->host_no, parent->port_identifier);
1455        rdev->rphy.identify.device_type = SAS_END_DEVICE;
1456        sas_rphy_initialize(&rdev->rphy);
1457        transport_setup_device(&rdev->rphy.dev);
1458
1459        return &rdev->rphy;
1460}
1461EXPORT_SYMBOL(sas_end_device_alloc);
1462
1463/**
1464 * sas_expander_alloc - allocate an rphy for an end device
1465 * @parent: which port
1466 * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1467 *
1468 * Allocates an SAS remote PHY structure, connected to @parent.
1469 *
1470 * Returns:
1471 *      SAS PHY allocated or %NULL if the allocation failed.
1472 */
1473struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1474                                    enum sas_device_type type)
1475{
1476        struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1477        struct sas_expander_device *rdev;
1478        struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1479
1480        BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1481               type != SAS_FANOUT_EXPANDER_DEVICE);
1482
1483        rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1484        if (!rdev) {
1485                return NULL;
1486        }
1487
1488        device_initialize(&rdev->rphy.dev);
1489        rdev->rphy.dev.parent = get_device(&parent->dev);
1490        rdev->rphy.dev.release = sas_expander_release;
1491        mutex_lock(&sas_host->lock);
1492        rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1493        mutex_unlock(&sas_host->lock);
1494        dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1495                     shost->host_no, rdev->rphy.scsi_target_id);
1496        rdev->rphy.identify.device_type = type;
1497        sas_rphy_initialize(&rdev->rphy);
1498        transport_setup_device(&rdev->rphy.dev);
1499
1500        return &rdev->rphy;
1501}
1502EXPORT_SYMBOL(sas_expander_alloc);
1503
1504/**
1505 * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
1506 * @rphy:       The remote PHY to be added
1507 *
1508 * Publishes a SAS remote PHY to the rest of the system.
1509 */
1510int sas_rphy_add(struct sas_rphy *rphy)
1511{
1512        struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1513        struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1514        struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1515        struct sas_identify *identify = &rphy->identify;
1516        int error;
1517
1518        if (parent->rphy)
1519                return -ENXIO;
1520        parent->rphy = rphy;
1521
1522        error = device_add(&rphy->dev);
1523        if (error)
1524                return error;
1525        transport_add_device(&rphy->dev);
1526        transport_configure_device(&rphy->dev);
1527        if (sas_bsg_initialize(shost, rphy))
1528                printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1529
1530
1531        mutex_lock(&sas_host->lock);
1532        list_add_tail(&rphy->list, &sas_host->rphy_list);
1533        if (identify->device_type == SAS_END_DEVICE &&
1534            (identify->target_port_protocols &
1535             (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
1536                rphy->scsi_target_id = sas_host->next_target_id++;
1537        else if (identify->device_type == SAS_END_DEVICE)
1538                rphy->scsi_target_id = -1;
1539        mutex_unlock(&sas_host->lock);
1540
1541        if (identify->device_type == SAS_END_DEVICE &&
1542            rphy->scsi_target_id != -1) {
1543                int lun;
1544
1545                if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1546                        lun = SCAN_WILD_CARD;
1547                else
1548                        lun = 0;
1549
1550                scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
1551                                 SCSI_SCAN_INITIAL);
1552        }
1553
1554        return 0;
1555}
1556EXPORT_SYMBOL(sas_rphy_add);
1557
1558/**
1559 * sas_rphy_free  -  free a SAS remote PHY
1560 * @rphy: SAS remote PHY to free
1561 *
1562 * Frees the specified SAS remote PHY.
1563 *
1564 * Note:
1565 *   This function must only be called on a remote
1566 *   PHY that has not successfully been added using
1567 *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1568 */
1569void sas_rphy_free(struct sas_rphy *rphy)
1570{
1571        struct device *dev = &rphy->dev;
1572        struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1573        struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1574
1575        mutex_lock(&sas_host->lock);
1576        list_del(&rphy->list);
1577        mutex_unlock(&sas_host->lock);
1578
1579        transport_destroy_device(dev);
1580
1581        put_device(dev);
1582}
1583EXPORT_SYMBOL(sas_rphy_free);
1584
1585/**
1586 * sas_rphy_delete  -  remove and free SAS remote PHY
1587 * @rphy:       SAS remote PHY to remove and free
1588 *
1589 * Removes the specified SAS remote PHY and frees it.
1590 */
1591void
1592sas_rphy_delete(struct sas_rphy *rphy)
1593{
1594        sas_rphy_remove(rphy);
1595        sas_rphy_free(rphy);
1596}
1597EXPORT_SYMBOL(sas_rphy_delete);
1598
1599/**
1600 * sas_rphy_unlink  -  unlink SAS remote PHY
1601 * @rphy:       SAS remote phy to unlink from its parent port
1602 *
1603 * Removes port reference to an rphy
1604 */
1605void sas_rphy_unlink(struct sas_rphy *rphy)
1606{
1607        struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1608
1609        parent->rphy = NULL;
1610}
1611EXPORT_SYMBOL(sas_rphy_unlink);
1612
1613/**
1614 * sas_rphy_remove  -  remove SAS remote PHY
1615 * @rphy:       SAS remote phy to remove
1616 *
1617 * Removes the specified SAS remote PHY.
1618 */
1619void
1620sas_rphy_remove(struct sas_rphy *rphy)
1621{
1622        struct device *dev = &rphy->dev;
1623
1624        switch (rphy->identify.device_type) {
1625        case SAS_END_DEVICE:
1626                scsi_remove_target(dev);
1627                break;
1628        case SAS_EDGE_EXPANDER_DEVICE:
1629        case SAS_FANOUT_EXPANDER_DEVICE:
1630                sas_remove_children(dev);
1631                break;
1632        default:
1633                break;
1634        }
1635
1636        sas_rphy_unlink(rphy);
1637        if (rphy->q)
1638                bsg_unregister_queue(rphy->q);
1639        transport_remove_device(dev);
1640        device_del(dev);
1641}
1642EXPORT_SYMBOL(sas_rphy_remove);
1643
1644/**
1645 * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
1646 * @dev:        device to check
1647 *
1648 * Returns:
1649 *      %1 if the device represents a SAS remote PHY, %0 else
1650 */
1651int scsi_is_sas_rphy(const struct device *dev)
1652{
1653        return dev->release == sas_end_device_release ||
1654                dev->release == sas_expander_release;
1655}
1656EXPORT_SYMBOL(scsi_is_sas_rphy);
1657
1658
1659/*
1660 * SCSI scan helper
1661 */
1662
1663static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1664                uint id, u64 lun)
1665{
1666        struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1667        struct sas_rphy *rphy;
1668
1669        mutex_lock(&sas_host->lock);
1670        list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1671                if (rphy->identify.device_type != SAS_END_DEVICE ||
1672                    rphy->scsi_target_id == -1)
1673                        continue;
1674
1675                if ((channel == SCAN_WILD_CARD || channel == 0) &&
1676                    (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1677                        scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id,
1678                                         lun, SCSI_SCAN_MANUAL);
1679                }
1680        }
1681        mutex_unlock(&sas_host->lock);
1682
1683        return 0;
1684}
1685
1686
1687/*
1688 * Setup / Teardown code
1689 */
1690
1691#define SETUP_TEMPLATE(attrb, field, perm, test)                        \
1692        i->private_##attrb[count] = dev_attr_##field;           \
1693        i->private_##attrb[count].attr.mode = perm;                     \
1694        i->attrb[count] = &i->private_##attrb[count];                   \
1695        if (test)                                                       \
1696                count++
1697
1698#define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)   \
1699        i->private_##attrb[count] = dev_attr_##field;           \
1700        i->private_##attrb[count].attr.mode = perm;                     \
1701        if (ro_test) {                                                  \
1702                i->private_##attrb[count].attr.mode = ro_perm;          \
1703                i->private_##attrb[count].store = NULL;                 \
1704        }                                                               \
1705        i->attrb[count] = &i->private_##attrb[count];                   \
1706        if (test)                                                       \
1707                count++
1708
1709#define SETUP_RPORT_ATTRIBUTE(field)                                    \
1710        SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1711
1712#define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)                     \
1713        SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1714
1715#define SETUP_PHY_ATTRIBUTE(field)                                      \
1716        SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1717
1718#define SETUP_PHY_ATTRIBUTE_RW(field)                                   \
1719        SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,       \
1720                        !i->f->set_phy_speed, S_IRUGO)
1721
1722#define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)                    \
1723        SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,       \
1724                          !i->f->func, S_IRUGO)
1725
1726#define SETUP_PORT_ATTRIBUTE(field)                                     \
1727        SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1728
1729#define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)                       \
1730        SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1731
1732#define SETUP_PHY_ATTRIBUTE_WRONLY(field)                               \
1733        SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1734
1735#define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)                \
1736        SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1737
1738#define SETUP_END_DEV_ATTRIBUTE(field)                                  \
1739        SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1740
1741#define SETUP_EXPANDER_ATTRIBUTE(field)                                 \
1742        SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1743
1744/**
1745 * sas_attach_transport  -  instantiate SAS transport template
1746 * @ft:         SAS transport class function template
1747 */
1748struct scsi_transport_template *
1749sas_attach_transport(struct sas_function_template *ft)
1750{
1751        struct sas_internal *i;
1752        int count;
1753
1754        i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1755        if (!i)
1756                return NULL;
1757
1758        i->t.user_scan = sas_user_scan;
1759
1760        i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1761        i->t.host_attrs.ac.class = &sas_host_class.class;
1762        i->t.host_attrs.ac.match = sas_host_match;
1763        transport_container_register(&i->t.host_attrs);
1764        i->t.host_size = sizeof(struct sas_host_attrs);
1765
1766        i->phy_attr_cont.ac.class = &sas_phy_class.class;
1767        i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1768        i->phy_attr_cont.ac.match = sas_phy_match;
1769        transport_container_register(&i->phy_attr_cont);
1770
1771        i->port_attr_cont.ac.class = &sas_port_class.class;
1772        i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1773        i->port_attr_cont.ac.match = sas_port_match;
1774        transport_container_register(&i->port_attr_cont);
1775
1776        i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1777        i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1778        i->rphy_attr_cont.ac.match = sas_rphy_match;
1779        transport_container_register(&i->rphy_attr_cont);
1780
1781        i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1782        i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1783        i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1784        transport_container_register(&i->end_dev_attr_cont);
1785
1786        i->expander_attr_cont.ac.class = &sas_expander_class.class;
1787        i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1788        i->expander_attr_cont.ac.match = sas_expander_match;
1789        transport_container_register(&i->expander_attr_cont);
1790
1791        i->f = ft;
1792
1793        count = 0;
1794        SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1795        SETUP_PHY_ATTRIBUTE(target_port_protocols);
1796        SETUP_PHY_ATTRIBUTE(device_type);
1797        SETUP_PHY_ATTRIBUTE(sas_address);
1798        SETUP_PHY_ATTRIBUTE(phy_identifier);
1799        SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1800        SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1801        SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1802        SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1803        SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1804
1805        SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1806        SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1807        SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1808        SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1809        SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1810        SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1811        SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1812        i->phy_attrs[count] = NULL;
1813
1814        count = 0;
1815        SETUP_PORT_ATTRIBUTE(num_phys);
1816        i->port_attrs[count] = NULL;
1817
1818        count = 0;
1819        SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1820        SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1821        SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1822        SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1823        SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1824        SETUP_RPORT_ATTRIBUTE(rphy_scsi_target_id);
1825        SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1826                                       get_enclosure_identifier);
1827        SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1828                                       get_bay_identifier);
1829        i->rphy_attrs[count] = NULL;
1830
1831        count = 0;
1832        SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1833        SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1834        SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1835        SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1836        SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1837        i->end_dev_attrs[count] = NULL;
1838
1839        count = 0;
1840        SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1841        SETUP_EXPANDER_ATTRIBUTE(product_id);
1842        SETUP_EXPANDER_ATTRIBUTE(product_rev);
1843        SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1844        SETUP_EXPANDER_ATTRIBUTE(component_id);
1845        SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1846        SETUP_EXPANDER_ATTRIBUTE(level);
1847        i->expander_attrs[count] = NULL;
1848
1849        return &i->t;
1850}
1851EXPORT_SYMBOL(sas_attach_transport);
1852
1853/**
1854 * sas_release_transport  -  release SAS transport template instance
1855 * @t:          transport template instance
1856 */
1857void sas_release_transport(struct scsi_transport_template *t)
1858{
1859        struct sas_internal *i = to_sas_internal(t);
1860
1861        transport_container_unregister(&i->t.host_attrs);
1862        transport_container_unregister(&i->phy_attr_cont);
1863        transport_container_unregister(&i->port_attr_cont);
1864        transport_container_unregister(&i->rphy_attr_cont);
1865        transport_container_unregister(&i->end_dev_attr_cont);
1866        transport_container_unregister(&i->expander_attr_cont);
1867
1868        kfree(i);
1869}
1870EXPORT_SYMBOL(sas_release_transport);
1871
1872static __init int sas_transport_init(void)
1873{
1874        int error;
1875
1876        error = transport_class_register(&sas_host_class);
1877        if (error)
1878                goto out;
1879        error = transport_class_register(&sas_phy_class);
1880        if (error)
1881                goto out_unregister_transport;
1882        error = transport_class_register(&sas_port_class);
1883        if (error)
1884                goto out_unregister_phy;
1885        error = transport_class_register(&sas_rphy_class);
1886        if (error)
1887                goto out_unregister_port;
1888        error = transport_class_register(&sas_end_dev_class);
1889        if (error)
1890                goto out_unregister_rphy;
1891        error = transport_class_register(&sas_expander_class);
1892        if (error)
1893                goto out_unregister_end_dev;
1894
1895        return 0;
1896
1897 out_unregister_end_dev:
1898        transport_class_unregister(&sas_end_dev_class);
1899 out_unregister_rphy:
1900        transport_class_unregister(&sas_rphy_class);
1901 out_unregister_port:
1902        transport_class_unregister(&sas_port_class);
1903 out_unregister_phy:
1904        transport_class_unregister(&sas_phy_class);
1905 out_unregister_transport:
1906        transport_class_unregister(&sas_host_class);
1907 out:
1908        return error;
1909
1910}
1911
1912static void __exit sas_transport_exit(void)
1913{
1914        transport_class_unregister(&sas_host_class);
1915        transport_class_unregister(&sas_phy_class);
1916        transport_class_unregister(&sas_port_class);
1917        transport_class_unregister(&sas_rphy_class);
1918        transport_class_unregister(&sas_end_dev_class);
1919        transport_class_unregister(&sas_expander_class);
1920}
1921
1922MODULE_AUTHOR("Christoph Hellwig");
1923MODULE_DESCRIPTION("SAS Transport Attributes");
1924MODULE_LICENSE("GPL");
1925
1926module_init(sas_transport_init);
1927module_exit(sas_transport_exit);
1928