drivers/ata/libata-transport.c

   1 /*
   2  *  Copyright 2008 ioogle, Inc.  All rights reserved.
   3  *      Released under GPL v2.
   4  *
   5  * Libata transport class.
   6  *
   7  * The ATA transport class contains common code to deal with ATA HBAs,
   8  * an approximated representation of ATA topologies in the driver model,
   9  * and various sysfs attributes to expose these topologies and management
  10  * interfaces to user-space.
  11  *
  12  * There are 3 objects defined in in this class:
  13  * - ata_port
  14  * - ata_link
  15  * - ata_device
  16  * Each port has a link object. Each link can have up to two devices for PATA
  17  * and generally one for SATA.
  18  * If there is SATA port multiplier [PMP], 15 additional ata_link object are
  19  * created.
  20  *
  21  * These objects are created when the ata host is initialized and when a PMP is
  22  * found. They are removed only when the HBA is removed, cleaned before the
  23  * error handler runs.
  24  */
  25
  26
  27 #include <linux/kernel.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/slab.h>
  31 #include <scsi/scsi_transport.h>
  32 #include <linux/libata.h>
  33 #include <linux/hdreg.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/pm_runtime.h>
  36
  37 #include "libata.h"
  38 #include "libata-transport.h"
  39
  40 #define ATA_PORT_ATTRS          2
  41 #define ATA_LINK_ATTRS          3
  42 #define ATA_DEV_ATTRS           9
  43
  44 struct scsi_transport_template;
  45 struct scsi_transport_template *ata_scsi_transport_template;
  46
  47 struct ata_internal {
  48         struct scsi_transport_template t;
  49
  50         struct device_attribute private_port_attrs[ATA_PORT_ATTRS];
  51         struct device_attribute private_link_attrs[ATA_LINK_ATTRS];
  52         struct device_attribute private_dev_attrs[ATA_DEV_ATTRS];
  53
  54         struct transport_container link_attr_cont;
  55         struct transport_container dev_attr_cont;
  56
  57         /*
  58          * The array of null terminated pointers to attributes
  59          * needed by scsi_sysfs.c
  60          */
  61         struct device_attribute *link_attrs[ATA_LINK_ATTRS + 1];
  62         struct device_attribute *port_attrs[ATA_PORT_ATTRS + 1];
  63         struct device_attribute *dev_attrs[ATA_DEV_ATTRS + 1];
  64 };
  65 #define to_ata_internal(tmpl)   container_of(tmpl, struct ata_internal, t)
  66
  67
  68 #define tdev_to_device(d)                                       \
  69         container_of((d), struct ata_device, tdev)
  70 #define transport_class_to_dev(dev)                             \
  71         tdev_to_device((dev)->parent)
  72
  73 #define tdev_to_link(d)                                         \
  74         container_of((d), struct ata_link, tdev)
  75 #define transport_class_to_link(dev)                            \
  76         tdev_to_link((dev)->parent)
  77
  78 #define tdev_to_port(d)                                         \
  79         container_of((d), struct ata_port, tdev)
  80 #define transport_class_to_port(dev)                            \
  81         tdev_to_port((dev)->parent)
  82
  83
  84 /* Device objects are always created whit link objects */
  85 static int ata_tdev_add(struct ata_device *dev);
  86 static void ata_tdev_delete(struct ata_device *dev);
  87
  88
  89 /*
  90  * Hack to allow attributes of the same name in different objects.
  91  */
  92 #define ATA_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  93         struct device_attribute device_attr_##_prefix##_##_name = \
  94         __ATTR(_name,_mode,_show,_store)
  95
  96 #define ata_bitfield_name_match(title, table)                   \
  97 static ssize_t                                                  \
  98 get_ata_##title##_names(u32 table_key, char *buf)               \
  99 {                                                               \
 100         char *prefix = "";                                      \
 101         ssize_t len = 0;                                        \
 102         int i;                                                  \
 103                                                                 \
 104         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 105                 if (table[i].value & table_key) {               \
 106                         len += sprintf(buf + len, "%s%s",       \
 107                                 prefix, table[i].name);         \
 108                         prefix = ", ";                          \
 109                 }                                               \
 110         }                                                       \
 111         len += sprintf(buf + len, "\n");                        \
 112         return len;                                             \
 113 }
 114
 115 #define ata_bitfield_name_search(title, table)                  \
 116 static ssize_t                                                  \
 117 get_ata_##title##_names(u32 table_key, char *buf)               \
 118 {                                                               \
 119         ssize_t len = 0;                                        \
 120         int i;                                                  \
 121                                                                 \
 122         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 123                 if (table[i].value == table_key) {              \
 124                         len += sprintf(buf + len, "%s",         \
 125                                 table[i].name);                 \
 126                         break;                                  \
 127                 }                                               \
 128         }                                                       \
 129         len += sprintf(buf + len, "\n");                        \
 130         return len;                                             \
 131 }
 132
 133 static struct {
 134         u32             value;
 135         char            *name;
 136 } ata_class_names[] = {
 137         { ATA_DEV_UNKNOWN,              "unknown" },
 138         { ATA_DEV_ATA,                  "ata" },
 139         { ATA_DEV_ATA_UNSUP,            "ata" },
 140         { ATA_DEV_ATAPI,                "atapi" },
 141         { ATA_DEV_ATAPI_UNSUP,          "atapi" },
 142         { ATA_DEV_PMP,                  "pmp" },
 143         { ATA_DEV_PMP_UNSUP,            "pmp" },
 144         { ATA_DEV_SEMB,                 "semb" },
 145         { ATA_DEV_SEMB_UNSUP,           "semb" },
 146         { ATA_DEV_NONE,                 "none" }
 147 };
 148 ata_bitfield_name_search(class, ata_class_names)
 149
 150
 151 static struct {
 152         u32             value;
 153         char            *name;
 154 } ata_err_names[] = {
 155         { AC_ERR_DEV,                   "DeviceError" },
 156         { AC_ERR_HSM,                   "HostStateMachineError" },
 157         { AC_ERR_TIMEOUT,               "Timeout" },
 158         { AC_ERR_MEDIA,                 "MediaError" },
 159         { AC_ERR_ATA_BUS,               "BusError" },
 160         { AC_ERR_HOST_BUS,              "HostBusError" },
 161         { AC_ERR_SYSTEM,                "SystemError" },
 162         { AC_ERR_INVALID,               "InvalidArg" },
 163         { AC_ERR_OTHER,                 "Unknown" },
 164         { AC_ERR_NODEV_HINT,            "NoDeviceHint" },
 165         { AC_ERR_NCQ,                   "NCQError" }
 166 };
 167 ata_bitfield_name_match(err, ata_err_names)
 168
 169 static struct {
 170         u32             value;
 171         char            *name;
 172 } ata_xfer_names[] = {
 173         { XFER_UDMA_7,                  "XFER_UDMA_7" },
 174         { XFER_UDMA_6,                  "XFER_UDMA_6" },
 175         { XFER_UDMA_5,                  "XFER_UDMA_5" },
 176         { XFER_UDMA_4,                  "XFER_UDMA_4" },
 177         { XFER_UDMA_3,                  "XFER_UDMA_3" },
 178         { XFER_UDMA_2,                  "XFER_UDMA_2" },
 179         { XFER_UDMA_1,                  "XFER_UDMA_1" },
 180         { XFER_UDMA_0,                  "XFER_UDMA_0" },
 181         { XFER_MW_DMA_4,                "XFER_MW_DMA_4" },
 182         { XFER_MW_DMA_3,                "XFER_MW_DMA_3" },
 183         { XFER_MW_DMA_2,                "XFER_MW_DMA_2" },
 184         { XFER_MW_DMA_1,                "XFER_MW_DMA_1" },
 185         { XFER_MW_DMA_0,                "XFER_MW_DMA_0" },
 186         { XFER_SW_DMA_2,                "XFER_SW_DMA_2" },
 187         { XFER_SW_DMA_1,                "XFER_SW_DMA_1" },
 188         { XFER_SW_DMA_0,                "XFER_SW_DMA_0" },
 189         { XFER_PIO_6,                   "XFER_PIO_6" },
 190         { XFER_PIO_5,                   "XFER_PIO_5" },
 191         { XFER_PIO_4,                   "XFER_PIO_4" },
 192         { XFER_PIO_3,                   "XFER_PIO_3" },
 193         { XFER_PIO_2,                   "XFER_PIO_2" },
 194         { XFER_PIO_1,                   "XFER_PIO_1" },
 195         { XFER_PIO_0,                   "XFER_PIO_0" },
 196         { XFER_PIO_SLOW,                "XFER_PIO_SLOW" }
 197 };
 198 ata_bitfield_name_match(xfer,ata_xfer_names)
 199
 200 /*
 201  * ATA Port attributes
 202  */
 203 #define ata_port_show_simple(field, name, format_string, cast)          \
 204 static ssize_t                                                          \
 205 show_ata_port_##name(struct device *dev,                                \
 206                      struct device_attribute *attr, char *buf)          \
 207 {                                                                       \
 208         struct ata_port *ap = transport_class_to_port(dev);             \
 209                                                                         \
 210         return snprintf(buf, 20, format_string, cast ap->field);        \
 211 }
 212
 213 #define ata_port_simple_attr(field, name, format_string, type)          \
 214         ata_port_show_simple(field, name, format_string, (type))        \
 215 static DEVICE_ATTR(name, S_IRUGO, show_ata_port_##name, NULL)
 216
 217 ata_port_simple_attr(nr_pmp_links, nr_pmp_links, "%d\n", int);
 218 ata_port_simple_attr(stats.idle_irq, idle_irq, "%ld\n", unsigned long);
 219
 220 static DECLARE_TRANSPORT_CLASS(ata_port_class,
 221                                "ata_port", NULL, NULL, NULL);
 222
 223 static void ata_tport_release(struct device *dev)
 224 {
 225         put_device(dev->parent);
 226 }
 227
 228 /**
 229  * ata_is_port --  check if a struct device represents a ATA port
 230  * @dev:        device to check
 231  *
 232  * Returns:
 233  *      %1 if the device represents a ATA Port, %0 else
 234  */
 235 static int ata_is_port(const struct device *dev)
 236 {
 237         return dev->release == ata_tport_release;
 238 }
 239
 240 static int ata_tport_match(struct attribute_container *cont,
 241                            struct device *dev)
 242 {
 243         if (!ata_is_port(dev))
 244                 return 0;
 245         return &ata_scsi_transport_template->host_attrs.ac == cont;
 246 }
 247
 248 /**
 249  * ata_tport_delete  --  remove ATA PORT
 250  * @port:       ATA PORT to remove
 251  *
 252  * Removes the specified ATA PORT.  Remove the associated link as well.
 253  */
 254 void ata_tport_delete(struct ata_port *ap)
 255 {
 256         struct device *dev = &ap->tdev;
 257
 258         ata_tlink_delete(&ap->link);
 259
 260         transport_remove_device(dev);
 261         device_del(dev);
 262         transport_destroy_device(dev);
 263         put_device(dev);
 264 }
 265
 266 /** ata_tport_add - initialize a transport ATA port structure
 267  *
 268  * @parent:     parent device
 269  * @ap:         existing ata_port structure
 270  *
 271  * Initialize a ATA port structure for sysfs.  It will be added to the device
 272  * tree below the device specified by @parent which could be a PCI device.
 273  *
 274  * Returns %0 on success
 275  */
 276 int ata_tport_add(struct device *parent,
 277                   struct ata_port *ap)
 278 {
 279         int error;
 280         struct device *dev = &ap->tdev;
 281
 282         device_initialize(dev);
 283         dev->type = &ata_port_type;
 284
 285         dev->parent = get_device(parent);
 286         dev->release = ata_tport_release;
 287         dev_set_name(dev, "ata%d", ap->print_id);
 288         transport_setup_device(dev);
 289         error = device_add(dev);
 290         if (error) {
 291                 goto tport_err;
 292         }
 293
 294         device_enable_async_suspend(dev);
 295         pm_runtime_set_active(dev);
 296         pm_runtime_enable(dev);
 297         pm_runtime_forbid(dev);
 298
 299         transport_add_device(dev);
 300         transport_configure_device(dev);
 301
 302         error = ata_tlink_add(&ap->link);
 303         if (error) {
 304                 goto tport_link_err;
 305         }
 306         return 0;
 307
 308  tport_link_err:
 309         transport_remove_device(dev);
 310         device_del(dev);
 311
 312  tport_err:
 313         transport_destroy_device(dev);
 314         put_device(dev);
 315         return error;
 316 }
 317
 318
 319 /*
 320  * ATA link attributes
 321  */
 322
 323
 324 #define ata_link_show_linkspeed(field)                                  \
 325 static ssize_t                                                          \
 326 show_ata_link_##field(struct device *dev,                               \
 327                       struct device_attribute *attr, char *buf)         \
 328 {                                                                       \
 329         struct ata_link *link = transport_class_to_link(dev);           \
 330                                                                         \
 331         return sprintf(buf,"%s\n", sata_spd_string(fls(link->field)));  \
 332 }
 333
 334 #define ata_link_linkspeed_attr(field)                                  \
 335         ata_link_show_linkspeed(field)                                  \
 336 static DEVICE_ATTR(field, S_IRUGO, show_ata_link_##field, NULL)
 337
 338 ata_link_linkspeed_attr(hw_sata_spd_limit);
 339 ata_link_linkspeed_attr(sata_spd_limit);
 340 ata_link_linkspeed_attr(sata_spd);
 341
 342
 343 static DECLARE_TRANSPORT_CLASS(ata_link_class,
 344                 "ata_link", NULL, NULL, NULL);
 345
 346 static void ata_tlink_release(struct device *dev)
 347 {
 348         put_device(dev->parent);
 349 }
 350
 351 /**
 352  * ata_is_link --  check if a struct device represents a ATA link
 353  * @dev:        device to check
 354  *
 355  * Returns:
 356  *      %1 if the device represents a ATA link, %0 else
 357  */
 358 static int ata_is_link(const struct device *dev)
 359 {
 360         return dev->release == ata_tlink_release;
 361 }
 362
 363 static int ata_tlink_match(struct attribute_container *cont,
 364                            struct device *dev)
 365 {
 366         struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
 367         if (!ata_is_link(dev))
 368                 return 0;
 369         return &i->link_attr_cont.ac == cont;
 370 }
 371
 372 /**
 373  * ata_tlink_delete  --  remove ATA LINK
 374  * @port:       ATA LINK to remove
 375  *
 376  * Removes the specified ATA LINK.  remove associated ATA device(s) as well.
 377  */
 378 void ata_tlink_delete(struct ata_link *link)
 379 {
 380         struct device *dev = &link->tdev;
 381         struct ata_device *ata_dev;
 382
 383         ata_for_each_dev(ata_dev, link, ALL) {
 384                 ata_tdev_delete(ata_dev);
 385         }
 386
 387         transport_remove_device(dev);
 388         device_del(dev);
 389         transport_destroy_device(dev);
 390         put_device(dev);
 391 }
 392
 393 /**
 394  * ata_tlink_add  --  initialize a transport ATA link structure
 395  * @link:       allocated ata_link structure.
 396  *
 397  * Initialize an ATA LINK structure for sysfs.  It will be added in the
 398  * device tree below the ATA PORT it belongs to.
 399  *
 400  * Returns %0 on success
 401  */
 402 int ata_tlink_add(struct ata_link *link)
 403 {
 404         struct device *dev = &link->tdev;
 405         struct ata_port *ap = link->ap;
 406         struct ata_device *ata_dev;
 407         int error;
 408
 409         device_initialize(dev);
 410         dev->parent = get_device(&ap->tdev);
 411         dev->release = ata_tlink_release;
 412         if (ata_is_host_link(link))
 413                 dev_set_name(dev, "link%d", ap->print_id);
 414         else
 415                 dev_set_name(dev, "link%d.%d", ap->print_id, link->pmp);
 416
 417         transport_setup_device(dev);
 418
 419         error = device_add(dev);
 420         if (error) {
 421                 goto tlink_err;
 422         }
 423
 424         transport_add_device(dev);
 425         transport_configure_device(dev);
 426
 427         ata_for_each_dev(ata_dev, link, ALL) {
 428                 error = ata_tdev_add(ata_dev);
 429                 if (error) {
 430                         goto tlink_dev_err;
 431                 }
 432         }
 433         return 0;
 434   tlink_dev_err:
 435         while (--ata_dev >= link->device) {
 436                 ata_tdev_delete(ata_dev);
 437         }
 438         transport_remove_device(dev);
 439         device_del(dev);
 440   tlink_err:
 441         transport_destroy_device(dev);
 442         put_device(dev);
 443         return error;
 444 }
 445
 446 /*
 447  * ATA device attributes
 448  */
 449
 450 #define ata_dev_show_class(title, field)                                \
 451 static ssize_t                                                          \
 452 show_ata_dev_##field(struct device *dev,                                \
 453                      struct device_attribute *attr, char *buf)          \
 454 {                                                                       \
 455         struct ata_device *ata_dev = transport_class_to_dev(dev);       \
 456                                                                         \
 457         return get_ata_##title##_names(ata_dev->field, buf);            \
 458 }
 459
 460 #define ata_dev_attr(title, field)                                      \
 461         ata_dev_show_class(title, field)                                \
 462 static DEVICE_ATTR(field, S_IRUGO, show_ata_dev_##field, NULL)
 463
 464 ata_dev_attr(class, class);
 465 ata_dev_attr(xfer, pio_mode);
 466 ata_dev_attr(xfer, dma_mode);
 467 ata_dev_attr(xfer, xfer_mode);
 468
 469
 470 #define ata_dev_show_simple(field, format_string, cast)         \
 471 static ssize_t                                                          \
 472 show_ata_dev_##field(struct device *dev,                                \
 473                      struct device_attribute *attr, char *buf)          \
 474 {                                                                       \
 475         struct ata_device *ata_dev = transport_class_to_dev(dev);       \
 476                                                                         \
 477         return snprintf(buf, 20, format_string, cast ata_dev->field);   \
 478 }
 479
 480 #define ata_dev_simple_attr(field, format_string, type) \
 481         ata_dev_show_simple(field, format_string, (type))       \
 482 static DEVICE_ATTR(field, S_IRUGO,                      \
 483                    show_ata_dev_##field, NULL)
 484
 485 ata_dev_simple_attr(spdn_cnt, "%d\n", int);
 486
 487 struct ata_show_ering_arg {
 488         char* buf;
 489         int written;
 490 };
 491
 492 static int ata_show_ering(struct ata_ering_entry *ent, void *void_arg)
 493 {
 494         struct ata_show_ering_arg* arg = void_arg;
 495         struct timespec time;
 496
 497         jiffies_to_timespec(ent->timestamp,&time);
 498         arg->written += sprintf(arg->buf + arg->written,
 499                                "[%5lu.%06lu]",
 500                                time.tv_sec, time.tv_nsec);
 501         arg->written += get_ata_err_names(ent->err_mask,
 502                                           arg->buf + arg->written);
 503         return 0;
 504 }
 505
 506 static ssize_t
 507 show_ata_dev_ering(struct device *dev,
 508                    struct device_attribute *attr, char *buf)
 509 {
 510         struct ata_device *ata_dev = transport_class_to_dev(dev);
 511         struct ata_show_ering_arg arg = { buf, 0 };
 512
 513         ata_ering_map(&ata_dev->ering, ata_show_ering, &arg);
 514         return arg.written;
 515 }
 516
 517
 518 static DEVICE_ATTR(ering, S_IRUGO, show_ata_dev_ering, NULL);
 519
 520 static ssize_t
 521 show_ata_dev_id(struct device *dev,
 522                 struct device_attribute *attr, char *buf)
 523 {
 524         struct ata_device *ata_dev = transport_class_to_dev(dev);
 525         int written = 0, i = 0;
 526
 527         if (ata_dev->class == ATA_DEV_PMP)
 528                 return 0;
 529         for(i=0;i<ATA_ID_WORDS;i++)  {
 530                 written += snprintf(buf+written, 20, "%04x%c",
 531                                     ata_dev->id[i],
 532                                     ((i+1) & 7) ? ' ' : '\n');
 533         }
 534         return written;
 535 }
 536
 537 static DEVICE_ATTR(id, S_IRUGO, show_ata_dev_id, NULL);
 538
 539 static ssize_t
 540 show_ata_dev_gscr(struct device *dev,
 541                   struct device_attribute *attr, char *buf)
 542 {
 543         struct ata_device *ata_dev = transport_class_to_dev(dev);
 544         int written = 0, i = 0;
 545
 546         if (ata_dev->class != ATA_DEV_PMP)
 547                 return 0;
 548         for(i=0;i<SATA_PMP_GSCR_DWORDS;i++)  {
 549                 written += snprintf(buf+written, 20, "%08x%c",
 550                                     ata_dev->gscr[i],
 551                                     ((i+1) & 3) ? ' ' : '\n');
 552         }
 553         if (SATA_PMP_GSCR_DWORDS & 3)
 554                 buf[written-1] = '\n';
 555         return written;
 556 }
 557
 558 static DEVICE_ATTR(gscr, S_IRUGO, show_ata_dev_gscr, NULL);
 559
 560 static DECLARE_TRANSPORT_CLASS(ata_dev_class,
 561                                "ata_device", NULL, NULL, NULL);
 562
 563 static void ata_tdev_release(struct device *dev)
 564 {
 565         put_device(dev->parent);
 566 }
 567
 568 /**
 569  * ata_is_ata_dev  --  check if a struct device represents a ATA device
 570  * @dev:        device to check
 571  *
 572  * Returns:
 573  *      %1 if the device represents a ATA device, %0 else
 574  */
 575 static int ata_is_ata_dev(const struct device *dev)
 576 {
 577         return dev->release == ata_tdev_release;
 578 }
 579
 580 static int ata_tdev_match(struct attribute_container *cont,
 581                           struct device *dev)
 582 {
 583         struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
 584         if (!ata_is_ata_dev(dev))
 585                 return 0;
 586         return &i->dev_attr_cont.ac == cont;
 587 }
 588
 589 /**
 590  * ata_tdev_free  --  free a ATA LINK
 591  * @dev:        ATA PHY to free
 592  *
 593  * Frees the specified ATA PHY.
 594  *
 595  * Note:
 596  *   This function must only be called on a PHY that has not
 597  *   successfully been added using ata_tdev_add().
 598  */
 599 static void ata_tdev_free(struct ata_device *dev)
 600 {
 601         transport_destroy_device(&dev->tdev);
 602         put_device(&dev->tdev);
 603 }
 604
 605 /**
 606  * ata_tdev_delete  --  remove ATA device
 607  * @port:       ATA PORT to remove
 608  *
 609  * Removes the specified ATA device.
 610  */
 611 static void ata_tdev_delete(struct ata_device *ata_dev)
 612 {
 613         struct device *dev = &ata_dev->tdev;
 614
 615         transport_remove_device(dev);
 616         device_del(dev);
 617         ata_tdev_free(ata_dev);
 618 }
 619
 620
 621 /**
 622  * ata_tdev_add  --  initialize a transport ATA device structure.
 623  * @ata_dev:    ata_dev structure.
 624  *
 625  * Initialize an ATA device structure for sysfs.  It will be added in the
 626  * device tree below the ATA LINK device it belongs to.
 627  *
 628  * Returns %0 on success
 629  */
 630 static int ata_tdev_add(struct ata_device *ata_dev)
 631 {
 632         struct device *dev = &ata_dev->tdev;
 633         struct ata_link *link = ata_dev->link;
 634         struct ata_port *ap = link->ap;
 635         int error;
 636
 637         device_initialize(dev);
 638         dev->parent = get_device(&link->tdev);
 639         dev->release = ata_tdev_release;
 640         if (ata_is_host_link(link))
 641                 dev_set_name(dev, "dev%d.%d", ap->print_id,ata_dev->devno);
 642         else
 643                 dev_set_name(dev, "dev%d.%d.0", ap->print_id, link->pmp);
 644
 645         transport_setup_device(dev);
 646         error = device_add(dev);
 647         if (error) {
 648                 ata_tdev_free(ata_dev);
 649                 return error;
 650         }
 651
 652         transport_add_device(dev);
 653         transport_configure_device(dev);
 654         return 0;
 655 }
 656
 657
 658 /*
 659  * Setup / Teardown code
 660  */
 661
 662 #define SETUP_TEMPLATE(attrb, field, perm, test)                        \
 663         i->private_##attrb[count] = dev_attr_##field;                   \
 664         i->private_##attrb[count].attr.mode = perm;                     \
 665         i->attrb[count] = &i->private_##attrb[count];                   \
 666         if (test)                                                       \
 667                 count++
 668
 669 #define SETUP_LINK_ATTRIBUTE(field)                                     \
 670         SETUP_TEMPLATE(link_attrs, field, S_IRUGO, 1)
 671
 672 #define SETUP_PORT_ATTRIBUTE(field)                                     \
 673         SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
 674
 675 #define SETUP_DEV_ATTRIBUTE(field)                                      \
 676         SETUP_TEMPLATE(dev_attrs, field, S_IRUGO, 1)
 677
 678 /**
 679  * ata_attach_transport  --  instantiate ATA transport template
 680  */
 681 struct scsi_transport_template *ata_attach_transport(void)
 682 {
 683         struct ata_internal *i;
 684         int count;
 685
 686         i = kzalloc(sizeof(struct ata_internal), GFP_KERNEL);
 687         if (!i)
 688                 return NULL;
 689
 690         i->t.eh_strategy_handler        = ata_scsi_error;
 691         i->t.eh_timed_out               = ata_scsi_timed_out;
 692         i->t.user_scan                  = ata_scsi_user_scan;
 693
 694         i->t.host_attrs.ac.attrs = &i->port_attrs[0];
 695         i->t.host_attrs.ac.class = &ata_port_class.class;
 696         i->t.host_attrs.ac.match = ata_tport_match;
 697         transport_container_register(&i->t.host_attrs);
 698
 699         i->link_attr_cont.ac.class = &ata_link_class.class;
 700         i->link_attr_cont.ac.attrs = &i->link_attrs[0];
 701         i->link_attr_cont.ac.match = ata_tlink_match;
 702         transport_container_register(&i->link_attr_cont);
 703
 704         i->dev_attr_cont.ac.class = &ata_dev_class.class;
 705         i->dev_attr_cont.ac.attrs = &i->dev_attrs[0];
 706         i->dev_attr_cont.ac.match = ata_tdev_match;
 707         transport_container_register(&i->dev_attr_cont);
 708
 709         count = 0;
 710         SETUP_PORT_ATTRIBUTE(nr_pmp_links);
 711         SETUP_PORT_ATTRIBUTE(idle_irq);
 712         BUG_ON(count > ATA_PORT_ATTRS);
 713         i->port_attrs[count] = NULL;
 714
 715         count = 0;
 716         SETUP_LINK_ATTRIBUTE(hw_sata_spd_limit);
 717         SETUP_LINK_ATTRIBUTE(sata_spd_limit);
 718         SETUP_LINK_ATTRIBUTE(sata_spd);
 719         BUG_ON(count > ATA_LINK_ATTRS);
 720         i->link_attrs[count] = NULL;
 721
 722         count = 0;
 723         SETUP_DEV_ATTRIBUTE(class);
 724         SETUP_DEV_ATTRIBUTE(pio_mode);
 725         SETUP_DEV_ATTRIBUTE(dma_mode);
 726         SETUP_DEV_ATTRIBUTE(xfer_mode);
 727         SETUP_DEV_ATTRIBUTE(spdn_cnt);
 728         SETUP_DEV_ATTRIBUTE(ering);
 729         SETUP_DEV_ATTRIBUTE(id);
 730         SETUP_DEV_ATTRIBUTE(gscr);
 731         BUG_ON(count > ATA_DEV_ATTRS);
 732         i->dev_attrs[count] = NULL;
 733
 734         return &i->t;
 735 }
 736
 737 /**
 738  * ata_release_transport  --  release ATA transport template instance
 739  * @t:          transport template instance
 740  */
 741 void ata_release_transport(struct scsi_transport_template *t)
 742 {
 743         struct ata_internal *i = to_ata_internal(t);
 744
 745         transport_container_unregister(&i->t.host_attrs);
 746         transport_container_unregister(&i->link_attr_cont);
 747         transport_container_unregister(&i->dev_attr_cont);
 748
 749         kfree(i);
 750 }
 751
 752 __init int libata_transport_init(void)
 753 {
 754         int error;
 755
 756         error = transport_class_register(&ata_link_class);
 757         if (error)
 758                 goto out_unregister_transport;
 759         error = transport_class_register(&ata_port_class);
 760         if (error)
 761                 goto out_unregister_link;
 762         error = transport_class_register(&ata_dev_class);
 763         if (error)
 764                 goto out_unregister_port;
 765         return 0;
 766
 767  out_unregister_port:
 768         transport_class_unregister(&ata_port_class);
 769  out_unregister_link:
 770         transport_class_unregister(&ata_link_class);
 771  out_unregister_transport:
 772         return error;
 773
 774 }
 775
 776 void __exit libata_transport_exit(void)
 777 {
 778         transport_class_unregister(&ata_link_class);
 779         transport_class_unregister(&ata_port_class);
 780         transport_class_unregister(&ata_dev_class);
 781 }