scsi_transport_sas.c

   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_device.h>
  38#include <scsi/scsi_host.h>
  39#include <scsi/scsi_transport.h>
  40#include <scsi/scsi_transport_sas.h>
  41
  42#include "scsi_sas_internal.h"
  43#include "scsi_priv.h"
  44
  45struct sas_host_attrs {
  46	struct list_head rphy_list;
  47	struct mutex lock;
  48	struct request_queue *q;
  49	u32 next_target_id;
  50	u32 next_expander_id;
  51	int next_port_id;
  52};
  53#define to_sas_host_attrs(host)	((struct sas_host_attrs *)(host)->shost_data)
  54
  55
  56/*
  57 * Hack to allow attributes of the same name in different objects.
  58 */
  59#define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  60	struct device_attribute dev_attr_##_prefix##_##_name = \
  61	__ATTR(_name,_mode,_show,_store)
  62
  63
  64/*
  65 * Pretty printing helpers
  66 */
  67
  68#define sas_bitfield_name_match(title, table)			\
  69static ssize_t							\
  70get_sas_##title##_names(u32 table_key, char *buf)		\
  71{								\
  72	char *prefix = "";					\
  73	ssize_t len = 0;					\
  74	int i;							\
  75								\
  76	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
  77		if (table[i].value & table_key) {		\
  78			len += sprintf(buf + len, "%s%s",	\
  79				prefix, table[i].name);		\
  80			prefix = ", ";				\
  81		}						\
  82	}							\
  83	len += sprintf(buf + len, "\n");			\
  84	return len;						\
  85}
  86
  87#define sas_bitfield_name_set(title, table)			\
  88static ssize_t							\
  89set_sas_##title##_names(u32 *table_key, const char *buf)	\
  90{								\
  91	ssize_t len = 0;					\
  92	int i;							\
  93								\
  94	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
  95		len = strlen(table[i].name);			\
  96		if (strncmp(buf, table[i].name, len) == 0 &&	\
  97		    (buf[len] == '\n' || buf[len] == '\0')) {	\
  98			*table_key = table[i].value;		\
  99			return 0;				\
 100		}						\
 101	}							\
 102	return -EINVAL;						\
 103}
 104
 105#define sas_bitfield_name_search(title, table)			\
 106static ssize_t							\
 107get_sas_##title##_names(u32 table_key, char *buf)		\
 108{								\
 109	ssize_t len = 0;					\
 110	int i;							\
 111								\
 112	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
 113		if (table[i].value == table_key) {		\
 114			len += sprintf(buf + len, "%s",		\
 115				table[i].name);			\
 116			break;					\
 117		}						\
 118	}							\
 119	len += sprintf(buf + len, "\n");			\
 120	return len;						\
 121}
 122
 123static struct {
 124	u32		value;
 125	char		*name;
 126} sas_device_type_names[] = {
 127	{ SAS_PHY_UNUSED,		"unused" },
 128	{ SAS_END_DEVICE,		"end device" },
 129	{ SAS_EDGE_EXPANDER_DEVICE,	"edge expander" },
 130	{ SAS_FANOUT_EXPANDER_DEVICE,	"fanout expander" },
 131};
 132sas_bitfield_name_search(device_type, sas_device_type_names)
 133
 134
 135static struct {
 136	u32		value;
 137	char		*name;
 138} sas_protocol_names[] = {
 139	{ SAS_PROTOCOL_SATA,		"sata" },
 140	{ SAS_PROTOCOL_SMP,		"smp" },
 141	{ SAS_PROTOCOL_STP,		"stp" },
 142	{ SAS_PROTOCOL_SSP,		"ssp" },
 143};
 144sas_bitfield_name_match(protocol, sas_protocol_names)
 145
 146static struct {
 147	u32		value;
 148	char		*name;
 149} sas_linkspeed_names[] = {
 150	{ SAS_LINK_RATE_UNKNOWN,	"Unknown" },
 151	{ SAS_PHY_DISABLED,		"Phy disabled" },
 152	{ SAS_LINK_RATE_FAILED,		"Link Rate failed" },
 153	{ SAS_SATA_SPINUP_HOLD,		"Spin-up hold" },
 154	{ SAS_LINK_RATE_1_5_GBPS,	"1.5 Gbit" },
 155	{ SAS_LINK_RATE_3_0_GBPS,	"3.0 Gbit" },
 156	{ SAS_LINK_RATE_6_0_GBPS,	"6.0 Gbit" },
 157	{ SAS_LINK_RATE_12_0_GBPS,	"12.0 Gbit" },
 158	{ SAS_LINK_RATE_22_5_GBPS,	"22.5 Gbit" },
 159};
 160sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 161sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
 162
 163static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
 164{
 165	struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
 166	struct sas_end_device *rdev;
 167
 168	BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
 169
 170	rdev = rphy_to_end_device(rphy);
 171	return rdev;
 172}
 173
 174static int sas_smp_dispatch(struct bsg_job *job)
 175{
 176	struct Scsi_Host *shost = dev_to_shost(job->dev);
 177	struct sas_rphy *rphy = NULL;
 178
 179	if (!scsi_is_host_device(job->dev))
 180		rphy = dev_to_rphy(job->dev);
 181
 182	if (!job->reply_payload.payload_len) {
 183		dev_warn(job->dev, "space for a smp response is missing\n");
 184		bsg_job_done(job, -EINVAL, 0);
 185		return 0;
 186	}
 187
 188	to_sas_internal(shost->transportt)->f->smp_handler(job, shost, rphy);
 189	return 0;
 190}
 191
 192static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
 193{
 194	struct request_queue *q;
 195
 196	if (!to_sas_internal(shost->transportt)->f->smp_handler) {
 197		printk("%s can't handle SMP requests\n", shost->hostt->name);
 198		return 0;
 199	}
 200
 201	if (rphy) {
 202		q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev), NULL,
 203				sas_smp_dispatch, NULL, 0);
 204		if (IS_ERR(q))
 205			return PTR_ERR(q);
 206		rphy->q = q;
 207	} else {
 208		char name[20];
 209
 210		snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
 211		q = bsg_setup_queue(&shost->shost_gendev, name, NULL,
 212				sas_smp_dispatch, NULL, 0);
 213		if (IS_ERR(q))
 214			return PTR_ERR(q);
 215		to_sas_host_attrs(shost)->q = q;
 216	}
 217
 218	return 0;
 219}
 220
 221/*
 222 * SAS host attributes
 223 */
 224
 225static int sas_host_setup(struct transport_container *tc, struct device *dev,
 226			  struct device *cdev)
 227{
 228	struct Scsi_Host *shost = dev_to_shost(dev);
 229	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 230	struct device *dma_dev = shost->dma_dev;
 231
 232	INIT_LIST_HEAD(&sas_host->rphy_list);
 233	mutex_init(&sas_host->lock);
 234	sas_host->next_target_id = 0;
 235	sas_host->next_expander_id = 0;
 236	sas_host->next_port_id = 0;
 237
 238	if (sas_bsg_initialize(shost, NULL))
 239		dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
 240			   shost->host_no);
 241
 242	if (dma_dev->dma_mask) {
 243		shost->opt_sectors = min_t(unsigned int, shost->max_sectors,
 244				dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
 245	}
 246
 247	return 0;
 248}
 249
 250static int sas_host_remove(struct transport_container *tc, struct device *dev,
 251			   struct device *cdev)
 252{
 253	struct Scsi_Host *shost = dev_to_shost(dev);
 254	struct request_queue *q = to_sas_host_attrs(shost)->q;
 255
 256	bsg_remove_queue(q);
 257	return 0;
 258}
 259
 260static DECLARE_TRANSPORT_CLASS(sas_host_class,
 261		"sas_host", sas_host_setup, sas_host_remove, NULL);
 262
 263static int sas_host_match(struct attribute_container *cont,
 264			    struct device *dev)
 265{
 266	struct Scsi_Host *shost;
 267	struct sas_internal *i;
 268
 269	if (!scsi_is_host_device(dev))
 270		return 0;
 271	shost = dev_to_shost(dev);
 272
 273	if (!shost->transportt)
 274		return 0;
 275	if (shost->transportt->host_attrs.ac.class !=
 276			&sas_host_class.class)
 277		return 0;
 278
 279	i = to_sas_internal(shost->transportt);
 280	return &i->t.host_attrs.ac == cont;
 281}
 282
 283static int do_sas_phy_delete(struct device *dev, void *data)
 284{
 285	int pass = (int)(unsigned long)data;
 286
 287	if (pass == 0 && scsi_is_sas_port(dev))
 288		sas_port_delete(dev_to_sas_port(dev));
 289	else if (pass == 1 && scsi_is_sas_phy(dev))
 290		sas_phy_delete(dev_to_phy(dev));
 291	return 0;
 292}
 293
 294/**
 295 * sas_remove_children  -  tear down a devices SAS data structures
 296 * @dev:	device belonging to the sas object
 297 *
 298 * Removes all SAS PHYs and remote PHYs for a given object
 299 */
 300void sas_remove_children(struct device *dev)
 301{
 302	device_for_each_child(dev, (void *)0, do_sas_phy_delete);
 303	device_for_each_child(dev, (void *)1, do_sas_phy_delete);
 304}
 305EXPORT_SYMBOL(sas_remove_children);
 306
 307/**
 308 * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
 309 * @shost:	Scsi Host that is torn down
 310 *
 311 * Removes all SAS PHYs and remote PHYs for a given Scsi_Host and remove the
 312 * Scsi_Host as well.
 313 *
 314 * Note: Do not call scsi_remove_host() on the Scsi_Host any more, as it is
 315 * already removed.
 316 */
 317void sas_remove_host(struct Scsi_Host *shost)
 318{
 319	sas_remove_children(&shost->shost_gendev);
 320	scsi_remove_host(shost);
 321}
 322EXPORT_SYMBOL(sas_remove_host);
 323
 324/**
 325 * sas_get_address - return the SAS address of the device
 326 * @sdev: scsi device
 327 *
 328 * Returns the SAS address of the scsi device
 329 */
 330u64 sas_get_address(struct scsi_device *sdev)
 331{
 332	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 333
 334	return rdev->rphy.identify.sas_address;
 335}
 336EXPORT_SYMBOL(sas_get_address);
 337
 338/**
 339 * sas_tlr_supported - checking TLR bit in vpd 0x90
 340 * @sdev: scsi device struct
 341 *
 342 * Check Transport Layer Retries are supported or not.
 343 * If vpd page 0x90 is present, TRL is supported.
 344 *
 345 */
 346unsigned int
 347sas_tlr_supported(struct scsi_device *sdev)
 348{
 349	const int vpd_len = 32;
 350	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 351	char *buffer = kzalloc(vpd_len, GFP_KERNEL);
 352	int ret = 0;
 353
 354	if (!buffer)
 355		goto out;
 356
 357	if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
 358		goto out;
 359
 360	/*
 361	 * Magic numbers: the VPD Protocol page (0x90)
 362	 * has a 4 byte header and then one entry per device port
 363	 * the TLR bit is at offset 8 on each port entry
 364	 * if we take the first port, that's at total offset 12
 365	 */
 366	ret = buffer[12] & 0x01;
 367
 368 out:
 369	kfree(buffer);
 370	rdev->tlr_supported = ret;
 371	return ret;
 372
 373}
 374EXPORT_SYMBOL_GPL(sas_tlr_supported);
 375
 376/**
 377 * sas_disable_tlr - setting TLR flags
 378 * @sdev: scsi device struct
 379 *
 380 * Seting tlr_enabled flag to 0.
 381 *
 382 */
 383void
 384sas_disable_tlr(struct scsi_device *sdev)
 385{
 386	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 387
 388	rdev->tlr_enabled = 0;
 389}
 390EXPORT_SYMBOL_GPL(sas_disable_tlr);
 391
 392/**
 393 * sas_enable_tlr - setting TLR flags
 394 * @sdev: scsi device struct
 395 *
 396 * Seting tlr_enabled flag 1.
 397 *
 398 */
 399void sas_enable_tlr(struct scsi_device *sdev)
 400{
 401	unsigned int tlr_supported = 0;
 402	tlr_supported  = sas_tlr_supported(sdev);
 403
 404	if (tlr_supported) {
 405		struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 406
 407		rdev->tlr_enabled = 1;
 408	}
 409
 410	return;
 411}
 412EXPORT_SYMBOL_GPL(sas_enable_tlr);
 413
 414unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
 415{
 416	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 417	return rdev->tlr_enabled;
 418}
 419EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
 420
 421/**
 422 * sas_ata_ncq_prio_supported - Check for ATA NCQ command priority support
 423 * @sdev: SCSI device
 424 *
 425 * Check if an ATA device supports NCQ priority using VPD page 89h (ATA
 426 * Information). Since this VPD page is implemented only for ATA devices,
 427 * this function always returns false for SCSI devices.
 428 */
 429bool sas_ata_ncq_prio_supported(struct scsi_device *sdev)
 430{
 431	struct scsi_vpd *vpd;
 432	bool ncq_prio_supported = false;
 433
 434	rcu_read_lock();
 435	vpd = rcu_dereference(sdev->vpd_pg89);
 436	if (vpd && vpd->len >= 214)
 437		ncq_prio_supported = (vpd->data[213] >> 4) & 1;
 438	rcu_read_unlock();
 439
 440	return ncq_prio_supported;
 441}
 442EXPORT_SYMBOL_GPL(sas_ata_ncq_prio_supported);
 443
 444/*
 445 * SAS Phy attributes
 446 */
 447
 448#define sas_phy_show_simple(field, name, format_string, cast)		\
 449static ssize_t								\
 450show_sas_phy_##name(struct device *dev, 				\
 451		    struct device_attribute *attr, char *buf)		\
 452{									\
 453	struct sas_phy *phy = transport_class_to_phy(dev);		\
 454									\
 455	return snprintf(buf, 20, format_string, cast phy->field);	\
 456}
 457
 458#define sas_phy_simple_attr(field, name, format_string, type)		\
 459	sas_phy_show_simple(field, name, format_string, (type))	\
 460static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 461
 462#define sas_phy_show_protocol(field, name)				\
 463static ssize_t								\
 464show_sas_phy_##name(struct device *dev, 				\
 465		    struct device_attribute *attr, char *buf)		\
 466{									\
 467	struct sas_phy *phy = transport_class_to_phy(dev);		\
 468									\
 469	if (!phy->field)						\
 470		return snprintf(buf, 20, "none\n");			\
 471	return get_sas_protocol_names(phy->field, buf);		\
 472}
 473
 474#define sas_phy_protocol_attr(field, name)				\
 475	sas_phy_show_protocol(field, name)				\
 476static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 477
 478#define sas_phy_show_linkspeed(field)					\
 479static ssize_t								\
 480show_sas_phy_##field(struct device *dev, 				\
 481		     struct device_attribute *attr, char *buf)		\
 482{									\
 483	struct sas_phy *phy = transport_class_to_phy(dev);		\
 484									\
 485	return get_sas_linkspeed_names(phy->field, buf);		\
 486}
 487
 488/* Fudge to tell if we're minimum or maximum */
 489#define sas_phy_store_linkspeed(field)					\
 490static ssize_t								\
 491store_sas_phy_##field(struct device *dev, 				\
 492		      struct device_attribute *attr, 			\
 493		      const char *buf,	size_t count)			\
 494{									\
 495	struct sas_phy *phy = transport_class_to_phy(dev);		\
 496	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
 497	struct sas_internal *i = to_sas_internal(shost->transportt);	\
 498	u32 value;							\
 499	struct sas_phy_linkrates rates = {0};				\
 500	int error;							\
 501									\
 502	error = set_sas_linkspeed_names(&value, buf);			\
 503	if (error)							\
 504		return error;						\
 505	rates.field = value;						\
 506	error = i->f->set_phy_speed(phy, &rates);			\
 507									\
 508	return error ? error : count;					\
 509}
 510
 511#define sas_phy_linkspeed_rw_attr(field)				\
 512	sas_phy_show_linkspeed(field)					\
 513	sas_phy_store_linkspeed(field)					\
 514static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,		\
 515	store_sas_phy_##field)
 516
 517#define sas_phy_linkspeed_attr(field)					\
 518	sas_phy_show_linkspeed(field)					\
 519static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 520
 521
 522#define sas_phy_show_linkerror(field)					\
 523static ssize_t								\
 524show_sas_phy_##field(struct device *dev, 				\
 525		     struct device_attribute *attr, char *buf)		\
 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->get_linkerrors ? i->f->get_linkerrors(phy) : 0;	\
 533	if (error)							\
 534		return error;						\
 535	return snprintf(buf, 20, "%u\n", phy->field);			\
 536}
 537
 538#define sas_phy_linkerror_attr(field)					\
 539	sas_phy_show_linkerror(field)					\
 540static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 541
 542
 543static ssize_t
 544show_sas_device_type(struct device *dev,
 545		     struct device_attribute *attr, char *buf)
 546{
 547	struct sas_phy *phy = transport_class_to_phy(dev);
 548
 549	if (!phy->identify.device_type)
 550		return snprintf(buf, 20, "none\n");
 551	return get_sas_device_type_names(phy->identify.device_type, buf);
 552}
 553static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 554
 555static ssize_t do_sas_phy_enable(struct device *dev,
 556		size_t count, int enable)
 557{
 558	struct sas_phy *phy = transport_class_to_phy(dev);
 559	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 560	struct sas_internal *i = to_sas_internal(shost->transportt);
 561	int error;
 562
 563	error = i->f->phy_enable(phy, enable);
 564	if (error)
 565		return error;
 566	phy->enabled = enable;
 567	return count;
 568};
 569
 570static ssize_t
 571store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 572		     const char *buf, size_t count)
 573{
 574	if (count < 1)
 575		return -EINVAL;
 576
 577	switch (buf[0]) {
 578	case '0':
 579		do_sas_phy_enable(dev, count, 0);
 580		break;
 581	case '1':
 582		do_sas_phy_enable(dev, count, 1);
 583		break;
 584	default:
 585		return -EINVAL;
 586	}
 587
 588	return count;
 589}
 590
 591static ssize_t
 592show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 593		    char *buf)
 594{
 595	struct sas_phy *phy = transport_class_to_phy(dev);
 596
 597	return snprintf(buf, 20, "%d\n", phy->enabled);
 598}
 599
 600static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
 601			 store_sas_phy_enable);
 602
 603static ssize_t
 604do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
 605{
 606	struct sas_phy *phy = transport_class_to_phy(dev);
 607	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 608	struct sas_internal *i = to_sas_internal(shost->transportt);
 609	int error;
 610
 611	error = i->f->phy_reset(phy, hard_reset);
 612	if (error)
 613		return error;
 614	phy->enabled = 1;
 615	return count;
 616};
 617
 618static ssize_t
 619store_sas_link_reset(struct device *dev, struct device_attribute *attr,
 620		     const char *buf, size_t count)
 621{
 622	return do_sas_phy_reset(dev, count, 0);
 623}
 624static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 625
 626static ssize_t
 627store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
 628		     const char *buf, size_t count)
 629{
 630	return do_sas_phy_reset(dev, count, 1);
 631}
 632static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 633
 634sas_phy_protocol_attr(identify.initiator_port_protocols,
 635		initiator_port_protocols);
 636sas_phy_protocol_attr(identify.target_port_protocols,
 637		target_port_protocols);
 638sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 639		unsigned long long);
 640sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 641sas_phy_linkspeed_attr(negotiated_linkrate);
 642sas_phy_linkspeed_attr(minimum_linkrate_hw);
 643sas_phy_linkspeed_rw_attr(minimum_linkrate);
 644sas_phy_linkspeed_attr(maximum_linkrate_hw);
 645sas_phy_linkspeed_rw_attr(maximum_linkrate);
 646sas_phy_linkerror_attr(invalid_dword_count);
 647sas_phy_linkerror_attr(running_disparity_error_count);
 648sas_phy_linkerror_attr(loss_of_dword_sync_count);
 649sas_phy_linkerror_attr(phy_reset_problem_count);
 650
 651static int sas_phy_setup(struct transport_container *tc, struct device *dev,
 652			 struct device *cdev)
 653{
 654	struct sas_phy *phy = dev_to_phy(dev);
 655	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 656	struct sas_internal *i = to_sas_internal(shost->transportt);
 657
 658	if (i->f->phy_setup)
 659		i->f->phy_setup(phy);
 660
 661	return 0;
 662}
 663
 664static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 665		"sas_phy", sas_phy_setup, NULL, NULL);
 666
 667static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 668{
 669	struct Scsi_Host *shost;
 670	struct sas_internal *i;
 671
 672	if (!scsi_is_sas_phy(dev))
 673		return 0;
 674	shost = dev_to_shost(dev->parent);
 675
 676	if (!shost->transportt)
 677		return 0;
 678	if (shost->transportt->host_attrs.ac.class !=
 679			&sas_host_class.class)
 680		return 0;
 681
 682	i = to_sas_internal(shost->transportt);
 683	return &i->phy_attr_cont.ac == cont;
 684}
 685
 686static void sas_phy_release(struct device *dev)
 687{
 688	struct sas_phy *phy = dev_to_phy(dev);
 689	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 690	struct sas_internal *i = to_sas_internal(shost->transportt);
 691
 692	if (i->f->phy_release)
 693		i->f->phy_release(phy);
 694	put_device(dev->parent);
 695	kfree(phy);
 696}
 697
 698/**
 699 * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
 700 * @parent:	Parent device
 701 * @number:	Phy index
 702 *
 703 * Allocates an SAS PHY structure.  It will be added in the device tree
 704 * below the device specified by @parent, which has to be either a Scsi_Host
 705 * or sas_rphy.
 706 *
 707 * Returns:
 708 *	SAS PHY allocated or %NULL if the allocation failed.
 709 */
 710struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 711{
 712	struct Scsi_Host *shost = dev_to_shost(parent);
 713	struct sas_phy *phy;
 714
 715	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
 716	if (!phy)
 717		return NULL;
 718
 719	phy->number = number;
 720	phy->enabled = 1;
 721
 722	device_initialize(&phy->dev);
 723	phy->dev.parent = get_device(parent);
 724	phy->dev.release = sas_phy_release;
 725	INIT_LIST_HEAD(&phy->port_siblings);
 726	if (scsi_is_sas_expander_device(parent)) {
 727		struct sas_rphy *rphy = dev_to_rphy(parent);
 728		dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
 729			rphy->scsi_target_id, number);
 730	} else
 731		dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
 732
 733	transport_setup_device(&phy->dev);
 734
 735	return phy;
 736}
 737EXPORT_SYMBOL(sas_phy_alloc);
 738
 739/**
 740 * sas_phy_add  -  add a SAS PHY to the device hierarchy
 741 * @phy:	The PHY to be added
 742 *
 743 * Publishes a SAS PHY to the rest of the system.
 744 */
 745int sas_phy_add(struct sas_phy *phy)
 746{
 747	int error;
 748
 749	error = device_add(&phy->dev);
 750	if (error)
 751		return error;
 752
 753	error = transport_add_device(&phy->dev);
 754	if (error) {
 755		device_del(&phy->dev);
 756		return error;
 757	}
 758	transport_configure_device(&phy->dev);
 759
 760	return 0;
 761}
 762EXPORT_SYMBOL(sas_phy_add);
 763
 764/**
 765 * sas_phy_free  -  free a SAS PHY
 766 * @phy:	SAS PHY to free
 767 *
 768 * Frees the specified SAS PHY.
 769 *
 770 * Note:
 771 *   This function must only be called on a PHY that has not
 772 *   successfully been added using sas_phy_add().
 773 */
 774void sas_phy_free(struct sas_phy *phy)
 775{
 776	transport_destroy_device(&phy->dev);
 777	put_device(&phy->dev);
 778}
 779EXPORT_SYMBOL(sas_phy_free);
 780
 781/**
 782 * sas_phy_delete  -  remove SAS PHY
 783 * @phy:	SAS PHY to remove
 784 *
 785 * Removes the specified SAS PHY.  If the SAS PHY has an
 786 * associated remote PHY it is removed before.
 787 */
 788void
 789sas_phy_delete(struct sas_phy *phy)
 790{
 791	struct device *dev = &phy->dev;
 792
 793	/* this happens if the phy is still part of a port when deleted */
 794	BUG_ON(!list_empty(&phy->port_siblings));
 795
 796	transport_remove_device(dev);
 797	device_del(dev);
 798	transport_destroy_device(dev);
 799	put_device(dev);
 800}
 801EXPORT_SYMBOL(sas_phy_delete);
 802
 803/**
 804 * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
 805 * @dev:	device to check
 806 *
 807 * Returns:
 808 *	%1 if the device represents a SAS PHY, %0 else
 809 */
 810int scsi_is_sas_phy(const struct device *dev)
 811{
 812	return dev->release == sas_phy_release;
 813}
 814EXPORT_SYMBOL(scsi_is_sas_phy);
 815
 816/*
 817 * SAS Port attributes
 818 */
 819#define sas_port_show_simple(field, name, format_string, cast)		\
 820static ssize_t								\
 821show_sas_port_##name(struct device *dev, 				\
 822		     struct device_attribute *attr, char *buf)		\
 823{									\
 824	struct sas_port *port = transport_class_to_sas_port(dev);	\
 825									\
 826	return snprintf(buf, 20, format_string, cast port->field);	\
 827}
 828
 829#define sas_port_simple_attr(field, name, format_string, type)		\
 830	sas_port_show_simple(field, name, format_string, (type))	\
 831static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
 832
 833sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
 834
 835static DECLARE_TRANSPORT_CLASS(sas_port_class,
 836			       "sas_port", NULL, NULL, NULL);
 837
 838static int sas_port_match(struct attribute_container *cont, struct device *dev)
 839{
 840	struct Scsi_Host *shost;
 841	struct sas_internal *i;
 842
 843	if (!scsi_is_sas_port(dev))
 844		return 0;
 845	shost = dev_to_shost(dev->parent);
 846
 847	if (!shost->transportt)
 848		return 0;
 849	if (shost->transportt->host_attrs.ac.class !=
 850			&sas_host_class.class)
 851		return 0;
 852
 853	i = to_sas_internal(shost->transportt);
 854	return &i->port_attr_cont.ac == cont;
 855}
 856
 857
 858static void sas_port_release(struct device *dev)
 859{
 860	struct sas_port *port = dev_to_sas_port(dev);
 861
 862	BUG_ON(!list_empty(&port->phy_list));
 863
 864	put_device(dev->parent);
 865	kfree(port);
 866}
 867
 868static void sas_port_create_link(struct sas_port *port,
 869				 struct sas_phy *phy)
 870{
 871	int res;
 872
 873	res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
 874				dev_name(&phy->dev));
 875	if (res)
 876		goto err;
 877	res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
 878	if (res)
 879		goto err;
 880	return;
 881err:
 882	printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
 883	       __func__, res);
 884}
 885
 886static void sas_port_delete_link(struct sas_port *port,
 887				 struct sas_phy *phy)
 888{
 889	sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
 890	sysfs_remove_link(&phy->dev.kobj, "port");
 891}
 892
 893/**
 894 * sas_port_alloc - allocate and initialize a SAS port structure
 895 *
 896 * @parent:	parent device
 897 * @port_id:	port number
 898 *
 899 * Allocates a SAS port structure.  It will be added to the device tree
 900 * below the device specified by @parent which must be either a Scsi_Host
 901 * or a sas_expander_device.
 902 *
 903 * Returns: %NULL on error
 904 */
 905struct sas_port *sas_port_alloc(struct device *parent, int port_id)
 906{
 907	struct Scsi_Host *shost = dev_to_shost(parent);
 908	struct sas_port *port;
 909
 910	port = kzalloc(sizeof(*port), GFP_KERNEL);
 911	if (!port)
 912		return NULL;
 913
 914	port->port_identifier = port_id;
 915
 916	device_initialize(&port->dev);
 917
 918	port->dev.parent = get_device(parent);
 919	port->dev.release = sas_port_release;
 920
 921	mutex_init(&port->phy_list_mutex);
 922	INIT_LIST_HEAD(&port->phy_list);
 923
 924	if (scsi_is_sas_expander_device(parent)) {
 925		struct sas_rphy *rphy = dev_to_rphy(parent);
 926		dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
 927			     rphy->scsi_target_id, port->port_identifier);
 928	} else
 929		dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
 930			     port->port_identifier);
 931
 932	transport_setup_device(&port->dev);
 933
 934	return port;
 935}
 936EXPORT_SYMBOL(sas_port_alloc);
 937
 938/**
 939 * sas_port_alloc_num - allocate and initialize a SAS port structure
 940 *
 941 * @parent:	parent device
 942 *
 943 * Allocates a SAS port structure and a number to go with it.  This
 944 * interface is really for adapters where the port number has no
 945 * meansing, so the sas class should manage them.  It will be added to
 946 * the device tree below the device specified by @parent which must be
 947 * either a Scsi_Host or a sas_expander_device.
 948 *
 949 * Returns: %NULL on error
 950 */
 951struct sas_port *sas_port_alloc_num(struct device *parent)
 952{
 953	int index;
 954	struct Scsi_Host *shost = dev_to_shost(parent);
 955	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 956
 957	/* FIXME: use idr for this eventually */
 958	mutex_lock(&sas_host->lock);
 959	if (scsi_is_sas_expander_device(parent)) {
 960		struct sas_rphy *rphy = dev_to_rphy(parent);
 961		struct sas_expander_device *exp = rphy_to_expander_device(rphy);
 962
 963		index = exp->next_port_id++;
 964	} else
 965		index = sas_host->next_port_id++;
 966	mutex_unlock(&sas_host->lock);
 967	return sas_port_alloc(parent, index);
 968}
 969EXPORT_SYMBOL(sas_port_alloc_num);
 970
 971/**
 972 * sas_port_add - add a SAS port to the device hierarchy
 973 * @port:	port to be added
 974 *
 975 * publishes a port to the rest of the system
 976 */
 977int sas_port_add(struct sas_port *port)
 978{
 979	int error;
 980
 981	/* No phys should be added until this is made visible */
 982	BUG_ON(!list_empty(&port->phy_list));
 983
 984	error = device_add(&port->dev);
 985
 986	if (error)
 987		return error;
 988
 989	transport_add_device(&port->dev);
 990	transport_configure_device(&port->dev);
 991
 992	return 0;
 993}
 994EXPORT_SYMBOL(sas_port_add);
 995
 996/**
 997 * sas_port_free  -  free a SAS PORT
 998 * @port:	SAS PORT to free
 999 *
1000 * Frees the specified SAS PORT.
1001 *
1002 * Note:
1003 *   This function must only be called on a PORT that has not
1004 *   successfully been added using sas_port_add().
1005 */
1006void sas_port_free(struct sas_port *port)
1007{
1008	transport_destroy_device(&port->dev);
1009	put_device(&port->dev);
1010}
1011EXPORT_SYMBOL(sas_port_free);
1012
1013/**
1014 * sas_port_delete  -  remove SAS PORT
1015 * @port:	SAS PORT to remove
1016 *
1017 * Removes the specified SAS PORT.  If the SAS PORT has an
1018 * associated phys, unlink them from the port as well.
1019 */
1020void sas_port_delete(struct sas_port *port)
1021{
1022	struct device *dev = &port->dev;
1023	struct sas_phy *phy, *tmp_phy;
1024
1025	if (port->rphy) {
1026		sas_rphy_delete(port->rphy);
1027		port->rphy = NULL;
1028	}
1029
1030	mutex_lock(&port->phy_list_mutex);
1031	list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
1032				 port_siblings) {
1033		sas_port_delete_link(port, phy);
1034		list_del_init(&phy->port_siblings);
1035	}
1036	mutex_unlock(&port->phy_list_mutex);
1037
1038	if (port->is_backlink) {
1039		struct device *parent = port->dev.parent;
1040
1041		sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1042		port->is_backlink = 0;
1043	}
1044
1045	transport_remove_device(dev);
1046	device_del(dev);
1047	transport_destroy_device(dev);
1048	put_device(dev);
1049}
1050EXPORT_SYMBOL(sas_port_delete);
1051
1052/**
1053 * scsi_is_sas_port -  check if a struct device represents a SAS port
1054 * @dev:	device to check
1055 *
1056 * Returns:
1057 *	%1 if the device represents a SAS Port, %0 else
1058 */
1059int scsi_is_sas_port(const struct device *dev)
1060{
1061	return dev->release == sas_port_release;
1062}
1063EXPORT_SYMBOL(scsi_is_sas_port);
1064
1065/**
1066 * sas_port_get_phy - try to take a reference on a port member
1067 * @port: port to check
1068 */
1069struct sas_phy *sas_port_get_phy(struct sas_port *port)
1070{
1071	struct sas_phy *phy;
1072
1073	mutex_lock(&port->phy_list_mutex);
1074	if (list_empty(&port->phy_list))
1075		phy = NULL;
1076	else {
1077		struct list_head *ent = port->phy_list.next;
1078
1079		phy = list_entry(ent, typeof(*phy), port_siblings);
1080		get_device(&phy->dev);
1081	}
1082	mutex_unlock(&port->phy_list_mutex);
1083
1084	return phy;
1085}
1086EXPORT_SYMBOL(sas_port_get_phy);
1087
1088/**
1089 * sas_port_add_phy - add another phy to a port to form a wide port
1090 * @port:	port to add the phy to
1091 * @phy:	phy to add
1092 *
1093 * When a port is initially created, it is empty (has no phys).  All
1094 * ports must have at least one phy to operated, and all wide ports
1095 * must have at least two.  The current code makes no difference
1096 * between ports and wide ports, but the only object that can be
1097 * connected to a remote device is a port, so ports must be formed on
1098 * all devices with phys if they're connected to anything.
1099 */
1100void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1101{
1102	mutex_lock(&port->phy_list_mutex);
1103	if (unlikely(!list_empty(&phy->port_siblings))) {
1104		/* make sure we're already on this port */
1105		struct sas_phy *tmp;
1106
1107		list_for_each_entry(tmp, &port->phy_list, port_siblings)
1108			if (tmp == phy)
1109				break;
1110		/* If this trips, you added a phy that was already
1111		 * part of a different port */
1112		if (unlikely(tmp != phy)) {
1113			dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1114				   dev_name(&phy->dev));
1115			BUG();
1116		}
1117	} else {
1118		sas_port_create_link(port, phy);
1119		list_add_tail(&phy->port_siblings, &port->phy_list);
1120		port->num_phys++;
1121	}
1122	mutex_unlock(&port->phy_list_mutex);
1123}
1124EXPORT_SYMBOL(sas_port_add_phy);
1125
1126/**
1127 * sas_port_delete_phy - remove a phy from a port or wide port
1128 * @port:	port to remove the phy from
1129 * @phy:	phy to remove
1130 *
1131 * This operation is used for tearing down ports again.  It must be
1132 * done to every port or wide port before calling sas_port_delete.
1133 */
1134void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1135{
1136	mutex_lock(&port->phy_list_mutex);
1137	sas_port_delete_link(port, phy);
1138	list_del_init(&phy->port_siblings);
1139	port->num_phys--;
1140	mutex_unlock(&port->phy_list_mutex);
1141}
1142EXPORT_SYMBOL(sas_port_delete_phy);
1143
1144void sas_port_mark_backlink(struct sas_port *port)
1145{
1146	int res;
1147	struct device *parent = port->dev.parent->parent->parent;
1148
1149	if (port->is_backlink)
1150		return;
1151	port->is_backlink = 1;
1152	res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1153				dev_name(parent));
1154	if (res)
1155		goto err;
1156	return;
1157err:
1158	printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1159	       __func__, res);
1160
1161}
1162EXPORT_SYMBOL(sas_port_mark_backlink);
1163
1164/*
1165 * SAS remote PHY attributes.
1166 */
1167
1168#define sas_rphy_show_simple(field, name, format_string, cast)		\
1169static ssize_t								\
1170show_sas_rphy_##name(struct device *dev, 				\
1171		     struct device_attribute *attr, char *buf)		\
1172{									\
1173	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1174									\
1175	return snprintf(buf, 20, format_string, cast rphy->field);	\
1176}
1177
1178#define sas_rphy_simple_attr(field, name, format_string, type)		\
1179	sas_rphy_show_simple(field, name, format_string, (type))	\
1180static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, 			\
1181		show_sas_rphy_##name, NULL)
1182
1183#define sas_rphy_show_protocol(field, name)				\
1184static ssize_t								\
1185show_sas_rphy_##name(struct device *dev, 				\
1186		     struct device_attribute *attr, char *buf)		\
1187{									\
1188	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1189									\
1190	if (!rphy->field)					\
1191		return snprintf(buf, 20, "none\n");			\
1192	return get_sas_protocol_names(rphy->field, buf);	\
1193}
1194
1195#define sas_rphy_protocol_attr(field, name)				\
1196	sas_rphy_show_protocol(field, name)				\
1197static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,			\
1198		show_sas_rphy_##name, NULL)
1199
1200static ssize_t
1201show_sas_rphy_device_type(struct device *dev,
1202			  struct device_attribute *attr, char *buf)
1203{
1204	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1205
1206	if (!rphy->identify.device_type)
1207		return snprintf(buf, 20, "none\n");
1208	return get_sas_device_type_names(
1209			rphy->identify.device_type, buf);
1210}
1211
1212static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1213		show_sas_rphy_device_type, NULL);
1214
1215static ssize_t
1216show_sas_rphy_enclosure_identifier(struct device *dev,
1217				   struct device_attribute *attr, char *buf)
1218{
1219	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1220	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1221	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1222	struct sas_internal *i = to_sas_internal(shost->transportt);
1223	u64 identifier;
1224	int error;
1225
1226	error = i->f->get_enclosure_identifier(rphy, &identifier);
1227	if (error)
1228		return error;
1229	return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1230}
1231
1232static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1233		show_sas_rphy_enclosure_identifier, NULL);
1234
1235static ssize_t
1236show_sas_rphy_bay_identifier(struct device *dev,
1237			     struct device_attribute *attr, char *buf)
1238{
1239	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1240	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1241	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1242	struct sas_internal *i = to_sas_internal(shost->transportt);
1243	int val;
1244
1245	val = i->f->get_bay_identifier(rphy);
1246	if (val < 0)
1247		return val;
1248	return sprintf(buf, "%d\n", val);
1249}
1250
1251static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1252		show_sas_rphy_bay_identifier, NULL);
1253
1254sas_rphy_protocol_attr(identify.initiator_port_protocols,
1255		initiator_port_protocols);
1256sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1257sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1258		unsigned long long);
1259sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1260sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
1261
1262/* only need 8 bytes of data plus header (4 or 8) */
1263#define BUF_SIZE 64
1264
1265int sas_read_port_mode_page(struct scsi_device *sdev)
1266{
1267	char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1268	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1269	struct scsi_mode_data mode_data;
1270	int error;
1271
1272	if (!buffer)
1273		return -ENOMEM;
1274
1275	error = scsi_mode_sense(sdev, 1, 0x19, 0, buffer, BUF_SIZE, 30*HZ, 3,
1276				&mode_data, NULL);
1277
1278	if (error)
1279		goto out;
1280
1281	msdata = buffer +  mode_data.header_length +
1282		mode_data.block_descriptor_length;
1283
1284	if (msdata - buffer > BUF_SIZE - 8)
1285		goto out;
1286
1287	error = 0;
1288
1289	rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1290	rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1291	rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1292
1293 out:
1294	kfree(buffer);
1295	return error;
1296}
1297EXPORT_SYMBOL(sas_read_port_mode_page);
1298
1299static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1300			       "sas_end_device", NULL, NULL, NULL);
1301
1302#define sas_end_dev_show_simple(field, name, format_string, cast)	\
1303static ssize_t								\
1304show_sas_end_dev_##name(struct device *dev, 				\
1305			struct device_attribute *attr, char *buf)	\
1306{									\
1307	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1308	struct sas_end_device *rdev = rphy_to_end_device(rphy);		\
1309									\
1310	return snprintf(buf, 20, format_string, cast rdev->field);	\
1311}
1312
1313#define sas_end_dev_simple_attr(field, name, format_string, type)	\
1314	sas_end_dev_show_simple(field, name, format_string, (type))	\
1315static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO, 			\
1316		show_sas_end_dev_##name, NULL)
1317
1318sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1319sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1320			"%d\n", int);
1321sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1322			"%d\n", int);
1323sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1324			"%d\n", int);
1325sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1326			"%d\n", int);
1327
1328static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1329			       "sas_expander", NULL, NULL, NULL);
1330
1331#define sas_expander_show_simple(field, name, format_string, cast)	\
1332static ssize_t								\
1333show_sas_expander_##name(struct device *dev, 				\
1334			 struct device_attribute *attr, char *buf)	\
1335{									\
1336	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1337	struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1338									\
1339	return snprintf(buf, 20, format_string, cast edev->field);	\
1340}
1341
1342#define sas_expander_simple_attr(field, name, format_string, type)	\
1343	sas_expander_show_simple(field, name, format_string, (type))	\
1344static SAS_DEVICE_ATTR(expander, name, S_IRUGO, 			\
1345		show_sas_expander_##name, NULL)
1346
1347sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1348sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1349sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1350sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1351			 "%s\n", char *);
1352sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1353sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1354			 unsigned int);
1355sas_expander_simple_attr(level, level, "%d\n", int);
1356
1357static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1358		"sas_device", NULL, NULL, NULL);
1359
1360static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1361{
1362	struct Scsi_Host *shost;
1363	struct sas_internal *i;
1364
1365	if (!scsi_is_sas_rphy(dev))
1366		return 0;
1367	shost = dev_to_shost(dev->parent->parent);
1368
1369	if (!shost->transportt)
1370		return 0;
1371	if (shost->transportt->host_attrs.ac.class !=
1372			&sas_host_class.class)
1373		return 0;
1374
1375	i = to_sas_internal(shost->transportt);
1376	return &i->rphy_attr_cont.ac == cont;
1377}
1378
1379static int sas_end_dev_match(struct attribute_container *cont,
1380			     struct device *dev)
1381{
1382	struct Scsi_Host *shost;
1383	struct sas_internal *i;
1384	struct sas_rphy *rphy;
1385
1386	if (!scsi_is_sas_rphy(dev))
1387		return 0;
1388	shost = dev_to_shost(dev->parent->parent);
1389	rphy = dev_to_rphy(dev);
1390
1391	if (!shost->transportt)
1392		return 0;
1393	if (shost->transportt->host_attrs.ac.class !=
1394			&sas_host_class.class)
1395		return 0;
1396
1397	i = to_sas_internal(shost->transportt);
1398	return &i->end_dev_attr_cont.ac == cont &&
1399		rphy->identify.device_type == SAS_END_DEVICE;
1400}
1401
1402static int sas_expander_match(struct attribute_container *cont,
1403			      struct device *dev)
1404{
1405	struct Scsi_Host *shost;
1406	struct sas_internal *i;
1407	struct sas_rphy *rphy;
1408
1409	if (!scsi_is_sas_rphy(dev))
1410		return 0;
1411	shost = dev_to_shost(dev->parent->parent);
1412	rphy = dev_to_rphy(dev);
1413
1414	if (!shost->transportt)
1415		return 0;
1416	if (shost->transportt->host_attrs.ac.class !=
1417			&sas_host_class.class)
1418		return 0;
1419
1420	i = to_sas_internal(shost->transportt);
1421	return &i->expander_attr_cont.ac == cont &&
1422		(rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1423		 rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1424}
1425
1426static void sas_expander_release(struct device *dev)
1427{
1428	struct sas_rphy *rphy = dev_to_rphy(dev);
1429	struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1430
1431	put_device(dev->parent);
1432	kfree(edev);
1433}
1434
1435static void sas_end_device_release(struct device *dev)
1436{
1437	struct sas_rphy *rphy = dev_to_rphy(dev);
1438	struct sas_end_device *edev = rphy_to_end_device(rphy);
1439
1440	put_device(dev->parent);
1441	kfree(edev);
1442}
1443
1444/**
1445 * sas_rphy_initialize - common rphy initialization
1446 * @rphy:	rphy to initialise
1447 *
1448 * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1449 * initialise the common rphy component of each.
1450 */
1451static void sas_rphy_initialize(struct sas_rphy *rphy)
1452{
1453	INIT_LIST_HEAD(&rphy->list);
1454}
1455
1456/**
1457 * sas_end_device_alloc - allocate an rphy for an end device
1458 * @parent: which port
1459 *
1460 * Allocates an SAS remote PHY structure, connected to @parent.
1461 *
1462 * Returns:
1463 *	SAS PHY allocated or %NULL if the allocation failed.
1464 */
1465struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1466{
1467	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1468	struct sas_end_device *rdev;
1469
1470	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1471	if (!rdev) {
1472		return NULL;
1473	}
1474
1475	device_initialize(&rdev->rphy.dev);
1476	rdev->rphy.dev.parent = get_device(&parent->dev);
1477	rdev->rphy.dev.release = sas_end_device_release;
1478	if (scsi_is_sas_expander_device(parent->dev.parent)) {
1479		struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1480		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1481			     shost->host_no, rphy->scsi_target_id,
1482			     parent->port_identifier);
1483	} else
1484		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1485			     shost->host_no, parent->port_identifier);
1486	rdev->rphy.identify.device_type = SAS_END_DEVICE;
1487	sas_rphy_initialize(&rdev->rphy);
1488	transport_setup_device(&rdev->rphy.dev);
1489
1490	return &rdev->rphy;
1491}
1492EXPORT_SYMBOL(sas_end_device_alloc);
1493
1494/**
1495 * sas_expander_alloc - allocate an rphy for an end device
1496 * @parent: which port
1497 * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1498 *
1499 * Allocates an SAS remote PHY structure, connected to @parent.
1500 *
1501 * Returns:
1502 *	SAS PHY allocated or %NULL if the allocation failed.
1503 */
1504struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1505				    enum sas_device_type type)
1506{
1507	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1508	struct sas_expander_device *rdev;
1509	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1510
1511	BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1512	       type != SAS_FANOUT_EXPANDER_DEVICE);
1513
1514	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1515	if (!rdev) {
1516		return NULL;
1517	}
1518
1519	device_initialize(&rdev->rphy.dev);
1520	rdev->rphy.dev.parent = get_device(&parent->dev);
1521	rdev->rphy.dev.release = sas_expander_release;
1522	mutex_lock(&sas_host->lock);
1523	rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1524	mutex_unlock(&sas_host->lock);
1525	dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1526		     shost->host_no, rdev->rphy.scsi_target_id);
1527	rdev->rphy.identify.device_type = type;
1528	sas_rphy_initialize(&rdev->rphy);
1529	transport_setup_device(&rdev->rphy.dev);
1530
1531	return &rdev->rphy;
1532}
1533EXPORT_SYMBOL(sas_expander_alloc);
1534
1535/**
1536 * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
1537 * @rphy:	The remote PHY to be added
1538 *
1539 * Publishes a SAS remote PHY to the rest of the system.
1540 */
1541int sas_rphy_add(struct sas_rphy *rphy)
1542{
1543	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1544	struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1545	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1546	struct sas_identify *identify = &rphy->identify;
1547	int error;
1548
1549	if (parent->rphy)
1550		return -ENXIO;
1551	parent->rphy = rphy;
1552
1553	error = device_add(&rphy->dev);
1554	if (error)
1555		return error;
1556	transport_add_device(&rphy->dev);
1557	transport_configure_device(&rphy->dev);
1558	if (sas_bsg_initialize(shost, rphy))
1559		printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1560
1561
1562	mutex_lock(&sas_host->lock);
1563	list_add_tail(&rphy->list, &sas_host->rphy_list);
1564	if (identify->device_type == SAS_END_DEVICE &&
1565	    (identify->target_port_protocols &
1566	     (SAS_PROTOCOL_SSP | SAS_PROTOCOL_STP | SAS_PROTOCOL_SATA)))
1567		rphy->scsi_target_id = sas_host->next_target_id++;
1568	else if (identify->device_type == SAS_END_DEVICE)
1569		rphy->scsi_target_id = -1;
1570	mutex_unlock(&sas_host->lock);
1571
1572	if (identify->device_type == SAS_END_DEVICE &&
1573	    rphy->scsi_target_id != -1) {
1574		int lun;
1575
1576		if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1577			lun = SCAN_WILD_CARD;
1578		else
1579			lun = 0;
1580
1581		scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
1582				 SCSI_SCAN_INITIAL);
1583	}
1584
1585	return 0;
1586}
1587EXPORT_SYMBOL(sas_rphy_add);
1588
1589/**
1590 * sas_rphy_free  -  free a SAS remote PHY
1591 * @rphy: SAS remote PHY to free
1592 *
1593 * Frees the specified SAS remote PHY.
1594 *
1595 * Note:
1596 *   This function must only be called on a remote
1597 *   PHY that has not successfully been added using
1598 *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1599 */
1600void sas_rphy_free(struct sas_rphy *rphy)
1601{
1602	struct device *dev = &rphy->dev;
1603	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1604	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1605
1606	mutex_lock(&sas_host->lock);
1607	list_del(&rphy->list);
1608	mutex_unlock(&sas_host->lock);
1609
1610	transport_destroy_device(dev);
1611
1612	put_device(dev);
1613}
1614EXPORT_SYMBOL(sas_rphy_free);
1615
1616/**
1617 * sas_rphy_delete  -  remove and free SAS remote PHY
1618 * @rphy:	SAS remote PHY to remove and free
1619 *
1620 * Removes the specified SAS remote PHY and frees it.
1621 */
1622void
1623sas_rphy_delete(struct sas_rphy *rphy)
1624{
1625	sas_rphy_remove(rphy);
1626	sas_rphy_free(rphy);
1627}
1628EXPORT_SYMBOL(sas_rphy_delete);
1629
1630/**
1631 * sas_rphy_unlink  -  unlink SAS remote PHY
1632 * @rphy:	SAS remote phy to unlink from its parent port
1633 *
1634 * Removes port reference to an rphy
1635 */
1636void sas_rphy_unlink(struct sas_rphy *rphy)
1637{
1638	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1639
1640	parent->rphy = NULL;
1641}
1642EXPORT_SYMBOL(sas_rphy_unlink);
1643
1644/**
1645 * sas_rphy_remove  -  remove SAS remote PHY
1646 * @rphy:	SAS remote phy to remove
1647 *
1648 * Removes the specified SAS remote PHY.
1649 */
1650void
1651sas_rphy_remove(struct sas_rphy *rphy)
1652{
1653	struct device *dev = &rphy->dev;
1654
1655	switch (rphy->identify.device_type) {
1656	case SAS_END_DEVICE:
1657		scsi_remove_target(dev);
1658		break;
1659	case SAS_EDGE_EXPANDER_DEVICE:
1660	case SAS_FANOUT_EXPANDER_DEVICE:
1661		sas_remove_children(dev);
1662		break;
1663	default:
1664		break;
1665	}
1666
1667	sas_rphy_unlink(rphy);
1668	bsg_remove_queue(rphy->q);
1669	transport_remove_device(dev);
1670	device_del(dev);
1671}
1672EXPORT_SYMBOL(sas_rphy_remove);
1673
1674/**
1675 * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
1676 * @dev:	device to check
1677 *
1678 * Returns:
1679 *	%1 if the device represents a SAS remote PHY, %0 else
1680 */
1681int scsi_is_sas_rphy(const struct device *dev)
1682{
1683	return dev->release == sas_end_device_release ||
1684		dev->release == sas_expander_release;
1685}
1686EXPORT_SYMBOL(scsi_is_sas_rphy);
1687
1688static void scan_channel_zero(struct Scsi_Host *shost, uint id, u64 lun)
1689{
1690	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1691	struct sas_rphy *rphy;
1692
1693	list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1694		if (rphy->identify.device_type != SAS_END_DEVICE ||
1695		    rphy->scsi_target_id == -1)
1696			continue;
1697
1698		if (id == SCAN_WILD_CARD || id == rphy->scsi_target_id) {
1699			scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id,
1700					 lun, SCSI_SCAN_MANUAL);
1701		}
1702	}
1703}
1704
1705/*
1706 * SCSI scan helper
1707 */
1708
1709static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1710		uint id, u64 lun)
1711{
1712	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1713	int res = 0;
1714	int i;
1715
1716	switch (channel) {
1717	case 0:
1718		mutex_lock(&sas_host->lock);
1719		scan_channel_zero(shost, id, lun);
1720		mutex_unlock(&sas_host->lock);
1721		break;
1722
1723	case SCAN_WILD_CARD:
1724		mutex_lock(&sas_host->lock);
1725		scan_channel_zero(shost, id, lun);
1726		mutex_unlock(&sas_host->lock);
1727
1728		for (i = 1; i <= shost->max_channel; i++) {
1729			res = scsi_scan_host_selected(shost, i, id, lun,
1730						      SCSI_SCAN_MANUAL);
1731			if (res)
1732				goto exit_scan;
1733		}
1734		break;
1735
1736	default:
1737		if (channel <= shost->max_channel) {
1738			res = scsi_scan_host_selected(shost, channel, id, lun,
1739						      SCSI_SCAN_MANUAL);
1740		} else {
1741			res = -EINVAL;
1742		}
1743		break;
1744	}
1745
1746exit_scan:
1747	return res;
1748}
1749
1750
1751/*
1752 * Setup / Teardown code
1753 */
1754
1755#define SETUP_TEMPLATE(attrb, field, perm, test)			\
1756	i->private_##attrb[count] = dev_attr_##field;		\
1757	i->private_##attrb[count].attr.mode = perm;			\
1758	i->attrb[count] = &i->private_##attrb[count];			\
1759	if (test)							\
1760		count++
1761
1762#define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)	\
1763	i->private_##attrb[count] = dev_attr_##field;		\
1764	i->private_##attrb[count].attr.mode = perm;			\
1765	if (ro_test) {							\
1766		i->private_##attrb[count].attr.mode = ro_perm;		\
1767		i->private_##attrb[count].store = NULL;			\
1768	}								\
1769	i->attrb[count] = &i->private_##attrb[count];			\
1770	if (test)							\
1771		count++
1772
1773#define SETUP_RPORT_ATTRIBUTE(field) 					\
1774	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1775
1776#define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)			\
1777	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1778
1779#define SETUP_PHY_ATTRIBUTE(field)					\
1780	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1781
1782#define SETUP_PHY_ATTRIBUTE_RW(field)					\
1783	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
1784			!i->f->set_phy_speed, S_IRUGO)
1785
1786#define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)			\
1787	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
1788			  !i->f->func, S_IRUGO)
1789
1790#define SETUP_PORT_ATTRIBUTE(field)					\
1791	SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1792
1793#define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)			\
1794	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1795
1796#define SETUP_PHY_ATTRIBUTE_WRONLY(field)				\
1797	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1798
1799#define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)		\
1800	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1801
1802#define SETUP_END_DEV_ATTRIBUTE(field)					\
1803	SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1804
1805#define SETUP_EXPANDER_ATTRIBUTE(field)					\
1806	SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1807
1808/**
1809 * sas_attach_transport  -  instantiate SAS transport template
1810 * @ft:		SAS transport class function template
1811 */
1812struct scsi_transport_template *
1813sas_attach_transport(struct sas_function_template *ft)
1814{
1815	struct sas_internal *i;
1816	int count;
1817
1818	i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1819	if (!i)
1820		return NULL;
1821
1822	i->t.user_scan = sas_user_scan;
1823
1824	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1825	i->t.host_attrs.ac.class = &sas_host_class.class;
1826	i->t.host_attrs.ac.match = sas_host_match;
1827	transport_container_register(&i->t.host_attrs);
1828	i->t.host_size = sizeof(struct sas_host_attrs);
1829
1830	i->phy_attr_cont.ac.class = &sas_phy_class.class;
1831	i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1832	i->phy_attr_cont.ac.match = sas_phy_match;
1833	transport_container_register(&i->phy_attr_cont);
1834
1835	i->port_attr_cont.ac.class = &sas_port_class.class;
1836	i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1837	i->port_attr_cont.ac.match = sas_port_match;
1838	transport_container_register(&i->port_attr_cont);
1839
1840	i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1841	i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1842	i->rphy_attr_cont.ac.match = sas_rphy_match;
1843	transport_container_register(&i->rphy_attr_cont);
1844
1845	i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1846	i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1847	i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1848	transport_container_register(&i->end_dev_attr_cont);
1849
1850	i->expander_attr_cont.ac.class = &sas_expander_class.class;
1851	i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1852	i->expander_attr_cont.ac.match = sas_expander_match;
1853	transport_container_register(&i->expander_attr_cont);
1854
1855	i->f = ft;
1856
1857	count = 0;
1858	SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1859	SETUP_PHY_ATTRIBUTE(target_port_protocols);
1860	SETUP_PHY_ATTRIBUTE(device_type);
1861	SETUP_PHY_ATTRIBUTE(sas_address);
1862	SETUP_PHY_ATTRIBUTE(phy_identifier);
1863	SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1864	SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1865	SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1866	SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1867	SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1868
1869	SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1870	SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1871	SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1872	SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1873	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1874	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1875	SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1876	i->phy_attrs[count] = NULL;
1877
1878	count = 0;
1879	SETUP_PORT_ATTRIBUTE(num_phys);
1880	i->port_attrs[count] = NULL;
1881
1882	count = 0;
1883	SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1884	SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1885	SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1886	SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1887	SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1888	SETUP_RPORT_ATTRIBUTE(rphy_scsi_target_id);
1889	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1890				       get_enclosure_identifier);
1891	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1892				       get_bay_identifier);
1893	i->rphy_attrs[count] = NULL;
1894
1895	count = 0;
1896	SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1897	SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1898	SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1899	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1900	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1901	i->end_dev_attrs[count] = NULL;
1902
1903	count = 0;
1904	SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1905	SETUP_EXPANDER_ATTRIBUTE(product_id);
1906	SETUP_EXPANDER_ATTRIBUTE(product_rev);
1907	SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1908	SETUP_EXPANDER_ATTRIBUTE(component_id);
1909	SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1910	SETUP_EXPANDER_ATTRIBUTE(level);
1911	i->expander_attrs[count] = NULL;
1912
1913	return &i->t;
1914}
1915EXPORT_SYMBOL(sas_attach_transport);
1916
1917/**
1918 * sas_release_transport  -  release SAS transport template instance
1919 * @t:		transport template instance
1920 */
1921void sas_release_transport(struct scsi_transport_template *t)
1922{
1923	struct sas_internal *i = to_sas_internal(t);
1924
1925	transport_container_unregister(&i->t.host_attrs);
1926	transport_container_unregister(&i->phy_attr_cont);
1927	transport_container_unregister(&i->port_attr_cont);
1928	transport_container_unregister(&i->rphy_attr_cont);
1929	transport_container_unregister(&i->end_dev_attr_cont);
1930	transport_container_unregister(&i->expander_attr_cont);
1931
1932	kfree(i);
1933}
1934EXPORT_SYMBOL(sas_release_transport);
1935
1936static __init int sas_transport_init(void)
1937{
1938	int error;
1939
1940	error = transport_class_register(&sas_host_class);
1941	if (error)
1942		goto out;
1943	error = transport_class_register(&sas_phy_class);
1944	if (error)
1945		goto out_unregister_transport;
1946	error = transport_class_register(&sas_port_class);
1947	if (error)
1948		goto out_unregister_phy;
1949	error = transport_class_register(&sas_rphy_class);
1950	if (error)
1951		goto out_unregister_port;
1952	error = transport_class_register(&sas_end_dev_class);
1953	if (error)
1954		goto out_unregister_rphy;
1955	error = transport_class_register(&sas_expander_class);
1956	if (error)
1957		goto out_unregister_end_dev;
1958
1959	return 0;
1960
1961 out_unregister_end_dev:
1962	transport_class_unregister(&sas_end_dev_class);
1963 out_unregister_rphy:
1964	transport_class_unregister(&sas_rphy_class);
1965 out_unregister_port:
1966	transport_class_unregister(&sas_port_class);
1967 out_unregister_phy:
1968	transport_class_unregister(&sas_phy_class);
1969 out_unregister_transport:
1970	transport_class_unregister(&sas_host_class);
1971 out:
1972	return error;
1973
1974}
1975
1976static void __exit sas_transport_exit(void)
1977{
1978	transport_class_unregister(&sas_host_class);
1979	transport_class_unregister(&sas_phy_class);
1980	transport_class_unregister(&sas_port_class);
1981	transport_class_unregister(&sas_rphy_class);
1982	transport_class_unregister(&sas_end_dev_class);
1983	transport_class_unregister(&sas_expander_class);
1984}
1985
1986MODULE_AUTHOR("Christoph Hellwig");
1987MODULE_DESCRIPTION("SAS Transport Attributes");
1988MODULE_LICENSE("GPL");
1989
1990module_init(sas_transport_init);
1991module_exit(sas_transport_exit);