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          3
  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_ZAC,                  "zac" },
 147         { ATA_DEV_NONE,                 "none" }
 148 };
 149 ata_bitfield_name_search(class, ata_class_names)
 150
 151
 152 static struct {
 153         u32             value;
 154         char            *name;
 155 } ata_err_names[] = {
 156         { AC_ERR_DEV,                   "DeviceError" },
 157         { AC_ERR_HSM,                   "HostStateMachineError" },
 158         { AC_ERR_TIMEOUT,               "Timeout" },
 159         { AC_ERR_MEDIA,                 "MediaError" },
 160         { AC_ERR_ATA_BUS,               "BusError" },
 161         { AC_ERR_HOST_BUS,              "HostBusError" },
 162         { AC_ERR_SYSTEM,                "SystemError" },
 163         { AC_ERR_INVALID,               "InvalidArg" },
 164         { AC_ERR_OTHER,                 "Unknown" },
 165         { AC_ERR_NODEV_HINT,            "NoDeviceHint" },
 166         { AC_ERR_NCQ,                   "NCQError" }
 167 };
 168 ata_bitfield_name_match(err, ata_err_names)
 169
 170 static struct {
 171         u32             value;
 172         char            *name;
 173 } ata_xfer_names[] = {
 174         { XFER_UDMA_7,                  "XFER_UDMA_7" },
 175         { XFER_UDMA_6,                  "XFER_UDMA_6" },
 176         { XFER_UDMA_5,                  "XFER_UDMA_5" },
 177         { XFER_UDMA_4,                  "XFER_UDMA_4" },
 178         { XFER_UDMA_3,                  "XFER_UDMA_3" },
 179         { XFER_UDMA_2,                  "XFER_UDMA_2" },
 180         { XFER_UDMA_1,                  "XFER_UDMA_1" },
 181         { XFER_UDMA_0,                  "XFER_UDMA_0" },
 182         { XFER_MW_DMA_4,                "XFER_MW_DMA_4" },
 183         { XFER_MW_DMA_3,                "XFER_MW_DMA_3" },
 184         { XFER_MW_DMA_2,                "XFER_MW_DMA_2" },
 185         { XFER_MW_DMA_1,                "XFER_MW_DMA_1" },
 186         { XFER_MW_DMA_0,                "XFER_MW_DMA_0" },
 187         { XFER_SW_DMA_2,                "XFER_SW_DMA_2" },
 188         { XFER_SW_DMA_1,                "XFER_SW_DMA_1" },
 189         { XFER_SW_DMA_0,                "XFER_SW_DMA_0" },
 190         { XFER_PIO_6,                   "XFER_PIO_6" },
 191         { XFER_PIO_5,                   "XFER_PIO_5" },
 192         { XFER_PIO_4,                   "XFER_PIO_4" },
 193         { XFER_PIO_3,                   "XFER_PIO_3" },
 194         { XFER_PIO_2,                   "XFER_PIO_2" },
 195         { XFER_PIO_1,                   "XFER_PIO_1" },
 196         { XFER_PIO_0,                   "XFER_PIO_0" },
 197         { XFER_PIO_SLOW,                "XFER_PIO_SLOW" }
 198 };
 199 ata_bitfield_name_match(xfer,ata_xfer_names)
 200
 201 /*
 202  * ATA Port attributes
 203  */
 204 #define ata_port_show_simple(field, name, format_string, cast)          \
 205 static ssize_t                                                          \
 206 show_ata_port_##name(struct device *dev,                                \
 207                      struct device_attribute *attr, char *buf)          \
 208 {                                                                       \
 209         struct ata_port *ap = transport_class_to_port(dev);             \
 210                                                                         \
 211         return snprintf(buf, 20, format_string, cast ap->field);        \
 212 }
 213
 214 #define ata_port_simple_attr(field, name, format_string, type)          \
 215         ata_port_show_simple(field, name, format_string, (type))        \
 216 static DEVICE_ATTR(name, S_IRUGO, show_ata_port_##name, NULL)
 217
 218 ata_port_simple_attr(nr_pmp_links, nr_pmp_links, "%d\n", int);
 219 ata_port_simple_attr(stats.idle_irq, idle_irq, "%ld\n", unsigned long);
 220 ata_port_simple_attr(local_port_no, port_no, "%u\n", unsigned int);
 221
 222 static DECLARE_TRANSPORT_CLASS(ata_port_class,
 223                                "ata_port", NULL, NULL, NULL);
 224
 225 static void ata_tport_release(struct device *dev)
 226 {
 227         put_device(dev->parent);
 228 }
 229
 230 /**
 231  * ata_is_port --  check if a struct device represents a ATA port
 232  * @dev:        device to check
 233  *
 234  * Returns:
 235  *      %1 if the device represents a ATA Port, %0 else
 236  */
 237 static int ata_is_port(const struct device *dev)
 238 {
 239         return dev->release == ata_tport_release;
 240 }
 241
 242 static int ata_tport_match(struct attribute_container *cont,
 243                            struct device *dev)
 244 {
 245         if (!ata_is_port(dev))
 246                 return 0;
 247         return &ata_scsi_transport_template->host_attrs.ac == cont;
 248 }
 249
 250 /**
 251  * ata_tport_delete  --  remove ATA PORT
 252  * @port:       ATA PORT to remove
 253  *
 254  * Removes the specified ATA PORT.  Remove the associated link as well.
 255  */
 256 void ata_tport_delete(struct ata_port *ap)
 257 {
 258         struct device *dev = &ap->tdev;
 259
 260         ata_tlink_delete(&ap->link);
 261
 262         transport_remove_device(dev);
 263         device_del(dev);
 264         transport_destroy_device(dev);
 265         put_device(dev);
 266 }
 267
 268 /** ata_tport_add - initialize a transport ATA port structure
 269  *
 270  * @parent:     parent device
 271  * @ap:         existing ata_port structure
 272  *
 273  * Initialize a ATA port structure for sysfs.  It will be added to the device
 274  * tree below the device specified by @parent which could be a PCI device.
 275  *
 276  * Returns %0 on success
 277  */
 278 int ata_tport_add(struct device *parent,
 279                   struct ata_port *ap)
 280 {
 281         int error;
 282         struct device *dev = &ap->tdev;
 283
 284         device_initialize(dev);
 285         dev->type = &ata_port_type;
 286
 287         dev->parent = get_device(parent);
 288         dev->release = ata_tport_release;
 289         dev_set_name(dev, "ata%d", ap->print_id);
 290         transport_setup_device(dev);
 291         ata_acpi_bind_port(ap);
 292         error = device_add(dev);
 293         if (error) {
 294                 goto tport_err;
 295         }
 296
 297         device_enable_async_suspend(dev);
 298         pm_runtime_set_active(dev);
 299         pm_runtime_enable(dev);
 300         pm_runtime_forbid(dev);
 301
 302         transport_add_device(dev);
 303         transport_configure_device(dev);
 304
 305         error = ata_tlink_add(&ap->link);
 306         if (error) {
 307                 goto tport_link_err;
 308         }
 309         return 0;
 310
 311  tport_link_err:
 312         transport_remove_device(dev);
 313         device_del(dev);
 314
 315  tport_err:
 316         transport_destroy_device(dev);
 317         put_device(dev);
 318         return error;
 319 }
 320
 321
 322 /*
 323  * ATA link attributes
 324  */
 325 static int noop(int x) { return x; }
 326
 327 #define ata_link_show_linkspeed(field, format)                          \
 328 static ssize_t                                                          \
 329 show_ata_link_##field(struct device *dev,                               \
 330                       struct device_attribute *attr, char *buf)         \
 331 {                                                                       \
 332         struct ata_link *link = transport_class_to_link(dev);           \
 333                                                                         \
 334         return sprintf(buf, "%s\n", sata_spd_string(format(link->field))); \
 335 }
 336
 337 #define ata_link_linkspeed_attr(field, format)                          \
 338         ata_link_show_linkspeed(field, format)                          \
 339 static DEVICE_ATTR(field, S_IRUGO, show_ata_link_##field, NULL)
 340
 341 ata_link_linkspeed_attr(hw_sata_spd_limit, fls);
 342 ata_link_linkspeed_attr(sata_spd_limit, fls);
 343 ata_link_linkspeed_attr(sata_spd, noop);
 344
 345
 346 static DECLARE_TRANSPORT_CLASS(ata_link_class,
 347                 "ata_link", NULL, NULL, NULL);
 348
 349 static void ata_tlink_release(struct device *dev)
 350 {
 351         put_device(dev->parent);
 352 }
 353
 354 /**
 355  * ata_is_link --  check if a struct device represents a ATA link
 356  * @dev:        device to check
 357  *
 358  * Returns:
 359  *      %1 if the device represents a ATA link, %0 else
 360  */
 361 static int ata_is_link(const struct device *dev)
 362 {
 363         return dev->release == ata_tlink_release;
 364 }
 365
 366 static int ata_tlink_match(struct attribute_container *cont,
 367                            struct device *dev)
 368 {
 369         struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
 370         if (!ata_is_link(dev))
 371                 return 0;
 372         return &i->link_attr_cont.ac == cont;
 373 }
 374
 375 /**
 376  * ata_tlink_delete  --  remove ATA LINK
 377  * @port:       ATA LINK to remove
 378  *
 379  * Removes the specified ATA LINK.  remove associated ATA device(s) as well.
 380  */
 381 void ata_tlink_delete(struct ata_link *link)
 382 {
 383         struct device *dev = &link->tdev;
 384         struct ata_device *ata_dev;
 385
 386         ata_for_each_dev(ata_dev, link, ALL) {
 387                 ata_tdev_delete(ata_dev);
 388         }
 389
 390         transport_remove_device(dev);
 391         device_del(dev);
 392         transport_destroy_device(dev);
 393         put_device(dev);
 394 }
 395
 396 /**
 397  * ata_tlink_add  --  initialize a transport ATA link structure
 398  * @link:       allocated ata_link structure.
 399  *
 400  * Initialize an ATA LINK structure for sysfs.  It will be added in the
 401  * device tree below the ATA PORT it belongs to.
 402  *
 403  * Returns %0 on success
 404  */
 405 int ata_tlink_add(struct ata_link *link)
 406 {
 407         struct device *dev = &link->tdev;
 408         struct ata_port *ap = link->ap;
 409         struct ata_device *ata_dev;
 410         int error;
 411
 412         device_initialize(dev);
 413         dev->parent = get_device(&ap->tdev);
 414         dev->release = ata_tlink_release;
 415         if (ata_is_host_link(link))
 416                 dev_set_name(dev, "link%d", ap->print_id);
 417         else
 418                 dev_set_name(dev, "link%d.%d", ap->print_id, link->pmp);
 419
 420         transport_setup_device(dev);
 421
 422         error = device_add(dev);
 423         if (error) {
 424                 goto tlink_err;
 425         }
 426
 427         transport_add_device(dev);
 428         transport_configure_device(dev);
 429
 430         ata_for_each_dev(ata_dev, link, ALL) {
 431                 error = ata_tdev_add(ata_dev);
 432                 if (error) {
 433                         goto tlink_dev_err;
 434                 }
 435         }
 436         return 0;
 437   tlink_dev_err:
 438         while (--ata_dev >= link->device) {
 439                 ata_tdev_delete(ata_dev);
 440         }
 441         transport_remove_device(dev);
 442         device_del(dev);
 443   tlink_err:
 444         transport_destroy_device(dev);
 445         put_device(dev);
 446         return error;
 447 }
 448
 449 /*
 450  * ATA device attributes
 451  */
 452
 453 #define ata_dev_show_class(title, field)                                \
 454 static ssize_t                                                          \
 455 show_ata_dev_##field(struct device *dev,                                \
 456                      struct device_attribute *attr, char *buf)          \
 457 {                                                                       \
 458         struct ata_device *ata_dev = transport_class_to_dev(dev);       \
 459                                                                         \
 460         return get_ata_##title##_names(ata_dev->field, buf);            \
 461 }
 462
 463 #define ata_dev_attr(title, field)                                      \
 464         ata_dev_show_class(title, field)                                \
 465 static DEVICE_ATTR(field, S_IRUGO, show_ata_dev_##field, NULL)
 466
 467 ata_dev_attr(class, class);
 468 ata_dev_attr(xfer, pio_mode);
 469 ata_dev_attr(xfer, dma_mode);
 470 ata_dev_attr(xfer, xfer_mode);
 471
 472
 473 #define ata_dev_show_simple(field, format_string, cast)         \
 474 static ssize_t                                                          \
 475 show_ata_dev_##field(struct device *dev,                                \
 476                      struct device_attribute *attr, char *buf)          \
 477 {                                                                       \
 478         struct ata_device *ata_dev = transport_class_to_dev(dev);       \
 479                                                                         \
 480         return snprintf(buf, 20, format_string, cast ata_dev->field);   \
 481 }
 482
 483 #define ata_dev_simple_attr(field, format_string, type) \
 484         ata_dev_show_simple(field, format_string, (type))       \
 485 static DEVICE_ATTR(field, S_IRUGO,                      \
 486                    show_ata_dev_##field, NULL)
 487
 488 ata_dev_simple_attr(spdn_cnt, "%d\n", int);
 489
 490 struct ata_show_ering_arg {
 491         char* buf;
 492         int written;
 493 };
 494
 495 static int ata_show_ering(struct ata_ering_entry *ent, void *void_arg)
 496 {
 497         struct ata_show_ering_arg* arg = void_arg;
 498         struct timespec time;
 499
 500         jiffies_to_timespec(ent->timestamp,&time);
 501         arg->written += sprintf(arg->buf + arg->written,
 502                                "[%5lu.%06lu]",
 503                                time.tv_sec, time.tv_nsec);
 504         arg->written += get_ata_err_names(ent->err_mask,
 505                                           arg->buf + arg->written);
 506         return 0;
 507 }
 508
 509 static ssize_t
 510 show_ata_dev_ering(struct device *dev,
 511                    struct device_attribute *attr, char *buf)
 512 {
 513         struct ata_device *ata_dev = transport_class_to_dev(dev);
 514         struct ata_show_ering_arg arg = { buf, 0 };
 515
 516         ata_ering_map(&ata_dev->ering, ata_show_ering, &arg);
 517         return arg.written;
 518 }
 519
 520
 521 static DEVICE_ATTR(ering, S_IRUGO, show_ata_dev_ering, NULL);
 522
 523 static ssize_t
 524 show_ata_dev_id(struct device *dev,
 525                 struct device_attribute *attr, char *buf)
 526 {
 527         struct ata_device *ata_dev = transport_class_to_dev(dev);
 528         int written = 0, i = 0;
 529
 530         if (ata_dev->class == ATA_DEV_PMP)
 531                 return 0;
 532         for(i=0;i<ATA_ID_WORDS;i++)  {
 533                 written += snprintf(buf+written, 20, "%04x%c",
 534                                     ata_dev->id[i],
 535                                     ((i+1) & 7) ? ' ' : '\n');
 536         }
 537         return written;
 538 }
 539
 540 static DEVICE_ATTR(id, S_IRUGO, show_ata_dev_id, NULL);
 541
 542 static ssize_t
 543 show_ata_dev_gscr(struct device *dev,
 544                   struct device_attribute *attr, char *buf)
 545 {
 546         struct ata_device *ata_dev = transport_class_to_dev(dev);
 547         int written = 0, i = 0;
 548
 549         if (ata_dev->class != ATA_DEV_PMP)
 550                 return 0;
 551         for(i=0;i<SATA_PMP_GSCR_DWORDS;i++)  {
 552                 written += snprintf(buf+written, 20, "%08x%c",
 553                                     ata_dev->gscr[i],
 554                                     ((i+1) & 3) ? ' ' : '\n');
 555         }
 556         if (SATA_PMP_GSCR_DWORDS & 3)
 557                 buf[written-1] = '\n';
 558         return written;
 559 }
 560
 561 static DEVICE_ATTR(gscr, S_IRUGO, show_ata_dev_gscr, NULL);
 562
 563 static ssize_t
 564 show_ata_dev_trim(struct device *dev,
 565                   struct device_attribute *attr, char *buf)
 566 {
 567         struct ata_device *ata_dev = transport_class_to_dev(dev);
 568         unsigned char *mode;
 569
 570         if (!ata_id_has_trim(ata_dev->id))
 571                 mode = "unsupported";
 572         else if (ata_dev->horkage & ATA_HORKAGE_NOTRIM)
 573                 mode = "forced_unsupported";
 574         else if (ata_dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM)
 575                         mode = "forced_unqueued";
 576         else if (ata_fpdma_dsm_supported(ata_dev))
 577                 mode = "queued";
 578         else
 579                 mode = "unqueued";
 580
 581         return snprintf(buf, 20, "%s\n", mode);
 582 }
 583
 584 static DEVICE_ATTR(trim, S_IRUGO, show_ata_dev_trim, NULL);
 585
 586 static DECLARE_TRANSPORT_CLASS(ata_dev_class,
 587                                "ata_device", NULL, NULL, NULL);
 588
 589 static void ata_tdev_release(struct device *dev)
 590 {
 591         put_device(dev->parent);
 592 }
 593
 594 /**
 595  * ata_is_ata_dev  --  check if a struct device represents a ATA device
 596  * @dev:        device to check
 597  *
 598  * Returns:
 599  *      %1 if the device represents a ATA device, %0 else
 600  */
 601 static int ata_is_ata_dev(const struct device *dev)
 602 {
 603         return dev->release == ata_tdev_release;
 604 }
 605
 606 static int ata_tdev_match(struct attribute_container *cont,
 607                           struct device *dev)
 608 {
 609         struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
 610         if (!ata_is_ata_dev(dev))
 611                 return 0;
 612         return &i->dev_attr_cont.ac == cont;
 613 }
 614
 615 /**
 616  * ata_tdev_free  --  free a ATA LINK
 617  * @dev:        ATA PHY to free
 618  *
 619  * Frees the specified ATA PHY.
 620  *
 621  * Note:
 622  *   This function must only be called on a PHY that has not
 623  *   successfully been added using ata_tdev_add().
 624  */
 625 static void ata_tdev_free(struct ata_device *dev)
 626 {
 627         transport_destroy_device(&dev->tdev);
 628         put_device(&dev->tdev);
 629 }
 630
 631 /**
 632  * ata_tdev_delete  --  remove ATA device
 633  * @port:       ATA PORT to remove
 634  *
 635  * Removes the specified ATA device.
 636  */
 637 static void ata_tdev_delete(struct ata_device *ata_dev)
 638 {
 639         struct device *dev = &ata_dev->tdev;
 640
 641         transport_remove_device(dev);
 642         device_del(dev);
 643         ata_tdev_free(ata_dev);
 644 }
 645
 646
 647 /**
 648  * ata_tdev_add  --  initialize a transport ATA device structure.
 649  * @ata_dev:    ata_dev structure.
 650  *
 651  * Initialize an ATA device structure for sysfs.  It will be added in the
 652  * device tree below the ATA LINK device it belongs to.
 653  *
 654  * Returns %0 on success
 655  */
 656 static int ata_tdev_add(struct ata_device *ata_dev)
 657 {
 658         struct device *dev = &ata_dev->tdev;
 659         struct ata_link *link = ata_dev->link;
 660         struct ata_port *ap = link->ap;
 661         int error;
 662
 663         device_initialize(dev);
 664         dev->parent = get_device(&link->tdev);
 665         dev->release = ata_tdev_release;
 666         if (ata_is_host_link(link))
 667                 dev_set_name(dev, "dev%d.%d", ap->print_id,ata_dev->devno);
 668         else
 669                 dev_set_name(dev, "dev%d.%d.0", ap->print_id, link->pmp);
 670
 671         transport_setup_device(dev);
 672         ata_acpi_bind_dev(ata_dev);
 673         error = device_add(dev);
 674         if (error) {
 675                 ata_tdev_free(ata_dev);
 676                 return error;
 677         }
 678
 679         transport_add_device(dev);
 680         transport_configure_device(dev);
 681         return 0;
 682 }
 683
 684
 685 /*
 686  * Setup / Teardown code
 687  */
 688
 689 #define SETUP_TEMPLATE(attrb, field, perm, test)                        \
 690         i->private_##attrb[count] = dev_attr_##field;                   \
 691         i->private_##attrb[count].attr.mode = perm;                     \
 692         i->attrb[count] = &i->private_##attrb[count];                   \
 693         if (test)                                                       \
 694                 count++
 695
 696 #define SETUP_LINK_ATTRIBUTE(field)                                     \
 697         SETUP_TEMPLATE(link_attrs, field, S_IRUGO, 1)
 698
 699 #define SETUP_PORT_ATTRIBUTE(field)                                     \
 700         SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
 701
 702 #define SETUP_DEV_ATTRIBUTE(field)                                      \
 703         SETUP_TEMPLATE(dev_attrs, field, S_IRUGO, 1)
 704
 705 /**
 706  * ata_attach_transport  --  instantiate ATA transport template
 707  */
 708 struct scsi_transport_template *ata_attach_transport(void)
 709 {
 710         struct ata_internal *i;
 711         int count;
 712
 713         i = kzalloc(sizeof(struct ata_internal), GFP_KERNEL);
 714         if (!i)
 715                 return NULL;
 716
 717         i->t.eh_strategy_handler        = ata_scsi_error;
 718         i->t.eh_timed_out               = ata_scsi_timed_out;
 719         i->t.user_scan                  = ata_scsi_user_scan;
 720
 721         i->t.host_attrs.ac.attrs = &i->port_attrs[0];
 722         i->t.host_attrs.ac.class = &ata_port_class.class;
 723         i->t.host_attrs.ac.match = ata_tport_match;
 724         transport_container_register(&i->t.host_attrs);
 725
 726         i->link_attr_cont.ac.class = &ata_link_class.class;
 727         i->link_attr_cont.ac.attrs = &i->link_attrs[0];
 728         i->link_attr_cont.ac.match = ata_tlink_match;
 729         transport_container_register(&i->link_attr_cont);
 730
 731         i->dev_attr_cont.ac.class = &ata_dev_class.class;
 732         i->dev_attr_cont.ac.attrs = &i->dev_attrs[0];
 733         i->dev_attr_cont.ac.match = ata_tdev_match;
 734         transport_container_register(&i->dev_attr_cont);
 735
 736         count = 0;
 737         SETUP_PORT_ATTRIBUTE(nr_pmp_links);
 738         SETUP_PORT_ATTRIBUTE(idle_irq);
 739         SETUP_PORT_ATTRIBUTE(port_no);
 740         BUG_ON(count > ATA_PORT_ATTRS);
 741         i->port_attrs[count] = NULL;
 742
 743         count = 0;
 744         SETUP_LINK_ATTRIBUTE(hw_sata_spd_limit);
 745         SETUP_LINK_ATTRIBUTE(sata_spd_limit);
 746         SETUP_LINK_ATTRIBUTE(sata_spd);
 747         BUG_ON(count > ATA_LINK_ATTRS);
 748         i->link_attrs[count] = NULL;
 749
 750         count = 0;
 751         SETUP_DEV_ATTRIBUTE(class);
 752         SETUP_DEV_ATTRIBUTE(pio_mode);
 753         SETUP_DEV_ATTRIBUTE(dma_mode);
 754         SETUP_DEV_ATTRIBUTE(xfer_mode);
 755         SETUP_DEV_ATTRIBUTE(spdn_cnt);
 756         SETUP_DEV_ATTRIBUTE(ering);
 757         SETUP_DEV_ATTRIBUTE(id);
 758         SETUP_DEV_ATTRIBUTE(gscr);
 759         SETUP_DEV_ATTRIBUTE(trim);
 760         BUG_ON(count > ATA_DEV_ATTRS);
 761         i->dev_attrs[count] = NULL;
 762
 763         return &i->t;
 764 }
 765
 766 /**
 767  * ata_release_transport  --  release ATA transport template instance
 768  * @t:          transport template instance
 769  */
 770 void ata_release_transport(struct scsi_transport_template *t)
 771 {
 772         struct ata_internal *i = to_ata_internal(t);
 773
 774         transport_container_unregister(&i->t.host_attrs);
 775         transport_container_unregister(&i->link_attr_cont);
 776         transport_container_unregister(&i->dev_attr_cont);
 777
 778         kfree(i);
 779 }
 780
 781 __init int libata_transport_init(void)
 782 {
 783         int error;
 784
 785         error = transport_class_register(&ata_link_class);
 786         if (error)
 787                 goto out_unregister_transport;
 788         error = transport_class_register(&ata_port_class);
 789         if (error)
 790                 goto out_unregister_link;
 791         error = transport_class_register(&ata_dev_class);
 792         if (error)
 793                 goto out_unregister_port;
 794         return 0;
 795
 796  out_unregister_port:
 797         transport_class_unregister(&ata_port_class);
 798  out_unregister_link:
 799         transport_class_unregister(&ata_link_class);
 800  out_unregister_transport:
 801         return error;
 802
 803 }
 804
 805 void __exit libata_transport_exit(void)
 806 {
 807         transport_class_unregister(&ata_link_class);
 808         transport_class_unregister(&ata_port_class);
 809         transport_class_unregister(&ata_dev_class);
 810 }