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"
  43struct sas_host_attrs {
  44	struct list_head rphy_list;
  45	struct mutex lock;
  46	struct request_queue *q;
  47	u32 next_target_id;
  48	u32 next_expander_id;
  49	int next_port_id;
  50};
  51#define to_sas_host_attrs(host)	((struct sas_host_attrs *)(host)->shost_data)
  52
  53
  54/*
  55 * Hack to allow attributes of the same name in different objects.
  56 */
  57#define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  58	struct device_attribute dev_attr_##_prefix##_##_name = \
  59	__ATTR(_name,_mode,_show,_store)
  60
  61
  62/*
  63 * Pretty printing helpers
  64 */
  65
  66#define sas_bitfield_name_match(title, table)			\
  67static ssize_t							\
  68get_sas_##title##_names(u32 table_key, char *buf)		\
  69{								\
  70	char *prefix = "";					\
  71	ssize_t len = 0;					\
  72	int i;							\
  73								\
  74	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
  75		if (table[i].value & table_key) {		\
  76			len += sprintf(buf + len, "%s%s",	\
  77				prefix, table[i].name);		\
  78			prefix = ", ";				\
  79		}						\
  80	}							\
  81	len += sprintf(buf + len, "\n");			\
  82	return len;						\
  83}
  84
  85#define sas_bitfield_name_set(title, table)			\
  86static ssize_t							\
  87set_sas_##title##_names(u32 *table_key, const char *buf)	\
  88{								\
  89	ssize_t len = 0;					\
  90	int i;							\
  91								\
  92	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
  93		len = strlen(table[i].name);			\
  94		if (strncmp(buf, table[i].name, len) == 0 &&	\
  95		    (buf[len] == '\n' || buf[len] == '\0')) {	\
  96			*table_key = table[i].value;		\
  97			return 0;				\
  98		}						\
  99	}							\
 100	return -EINVAL;						\
 101}
 102
 103#define sas_bitfield_name_search(title, table)			\
 104static ssize_t							\
 105get_sas_##title##_names(u32 table_key, char *buf)		\
 106{								\
 107	ssize_t len = 0;					\
 108	int i;							\
 109								\
 110	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
 111		if (table[i].value == table_key) {		\
 112			len += sprintf(buf + len, "%s",		\
 113				table[i].name);			\
 114			break;					\
 115		}						\
 116	}							\
 117	len += sprintf(buf + len, "\n");			\
 118	return len;						\
 119}
 120
 121static struct {
 122	u32		value;
 123	char		*name;
 124} sas_device_type_names[] = {
 125	{ SAS_PHY_UNUSED,		"unused" },
 126	{ SAS_END_DEVICE,		"end device" },
 127	{ SAS_EDGE_EXPANDER_DEVICE,	"edge expander" },
 128	{ SAS_FANOUT_EXPANDER_DEVICE,	"fanout expander" },
 129};
 130sas_bitfield_name_search(device_type, sas_device_type_names)
 131
 132
 133static struct {
 134	u32		value;
 135	char		*name;
 136} sas_protocol_names[] = {
 137	{ SAS_PROTOCOL_SATA,		"sata" },
 138	{ SAS_PROTOCOL_SMP,		"smp" },
 139	{ SAS_PROTOCOL_STP,		"stp" },
 140	{ SAS_PROTOCOL_SSP,		"ssp" },
 141};
 142sas_bitfield_name_match(protocol, sas_protocol_names)
 143
 144static struct {
 145	u32		value;
 146	char		*name;
 147} sas_linkspeed_names[] = {
 148	{ SAS_LINK_RATE_UNKNOWN,	"Unknown" },
 149	{ SAS_PHY_DISABLED,		"Phy disabled" },
 150	{ SAS_LINK_RATE_FAILED,		"Link Rate failed" },
 151	{ SAS_SATA_SPINUP_HOLD,		"Spin-up hold" },
 152	{ SAS_LINK_RATE_1_5_GBPS,	"1.5 Gbit" },
 153	{ SAS_LINK_RATE_3_0_GBPS,	"3.0 Gbit" },
 154	{ SAS_LINK_RATE_6_0_GBPS,	"6.0 Gbit" },
 155	{ SAS_LINK_RATE_12_0_GBPS,	"12.0 Gbit" },
 156	{ SAS_LINK_RATE_22_5_GBPS,	"22.5 Gbit" },
 157};
 158sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 159sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
 160
 161static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
 162{
 163	struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
 164	struct sas_end_device *rdev;
 165
 166	BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
 167
 168	rdev = rphy_to_end_device(rphy);
 169	return rdev;
 170}
 171
 172static int sas_smp_dispatch(struct bsg_job *job)
 173{
 174	struct Scsi_Host *shost = dev_to_shost(job->dev);
 175	struct sas_rphy *rphy = NULL;
 176
 177	if (!scsi_is_host_device(job->dev))
 178		rphy = dev_to_rphy(job->dev);
 179
 180	if (!job->reply_payload.payload_len) {
 181		dev_warn(job->dev, "space for a smp response is missing\n");
 182		bsg_job_done(job, -EINVAL, 0);
 183		return 0;
 184	}
 185
 186	to_sas_internal(shost->transportt)->f->smp_handler(job, shost, rphy);
 187	return 0;
 188}
 189
 190static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
 191{
 192	struct request_queue *q;
 193
 194	if (!to_sas_internal(shost->transportt)->f->smp_handler) {
 195		printk("%s can't handle SMP requests\n", shost->hostt->name);
 196		return 0;
 197	}
 198
 199	if (rphy) {
 200		q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev),
 201				sas_smp_dispatch, NULL, 0);
 202		if (IS_ERR(q))
 203			return PTR_ERR(q);
 204		rphy->q = q;
 205	} else {
 206		char name[20];
 207
 208		snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
 209		q = bsg_setup_queue(&shost->shost_gendev, name,
 210				sas_smp_dispatch, NULL, 0);
 211		if (IS_ERR(q))
 212			return PTR_ERR(q);
 213		to_sas_host_attrs(shost)->q = q;
 214	}
 215
 216	return 0;
 217}
 218
 219/*
 220 * SAS host attributes
 221 */
 222
 223static int sas_host_setup(struct transport_container *tc, struct device *dev,
 224			  struct device *cdev)
 225{
 226	struct Scsi_Host *shost = dev_to_shost(dev);
 227	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 228	struct device *dma_dev = shost->dma_dev;
 229
 230	INIT_LIST_HEAD(&sas_host->rphy_list);
 231	mutex_init(&sas_host->lock);
 232	sas_host->next_target_id = 0;
 233	sas_host->next_expander_id = 0;
 234	sas_host->next_port_id = 0;
 235
 236	if (sas_bsg_initialize(shost, NULL))
 237		dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
 238			   shost->host_no);
 239
 240	if (dma_dev->dma_mask) {
 241		shost->opt_sectors = min_t(unsigned int, shost->max_sectors,
 242				dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
 243	}
 244
 245	return 0;
 246}
 247
 248static int sas_host_remove(struct transport_container *tc, struct device *dev,
 249			   struct device *cdev)
 250{
 251	struct Scsi_Host *shost = dev_to_shost(dev);
 252	struct request_queue *q = to_sas_host_attrs(shost)->q;
 253
 254	bsg_remove_queue(q);
 255	return 0;
 256}
 257
 258static DECLARE_TRANSPORT_CLASS(sas_host_class,
 259		"sas_host", sas_host_setup, sas_host_remove, NULL);
 260
 261static int sas_host_match(struct attribute_container *cont,
 262			    struct device *dev)
 263{
 264	struct Scsi_Host *shost;
 265	struct sas_internal *i;
 266
 267	if (!scsi_is_host_device(dev))
 268		return 0;
 269	shost = dev_to_shost(dev);
 270
 271	if (!shost->transportt)
 272		return 0;
 273	if (shost->transportt->host_attrs.ac.class !=
 274			&sas_host_class.class)
 275		return 0;
 276
 277	i = to_sas_internal(shost->transportt);
 278	return &i->t.host_attrs.ac == cont;
 279}
 280
 281static int do_sas_phy_delete(struct device *dev, void *data)
 282{
 283	int pass = (int)(unsigned long)data;
 284
 285	if (pass == 0 && scsi_is_sas_port(dev))
 286		sas_port_delete(dev_to_sas_port(dev));
 287	else if (pass == 1 && scsi_is_sas_phy(dev))
 288		sas_phy_delete(dev_to_phy(dev));
 289	return 0;
 290}
 291
 292/**
 293 * sas_remove_children  -  tear down a devices SAS data structures
 294 * @dev:	device belonging to the sas object
 295 *
 296 * Removes all SAS PHYs and remote PHYs for a given object
 297 */
 298void sas_remove_children(struct device *dev)
 299{
 300	device_for_each_child(dev, (void *)0, do_sas_phy_delete);
 301	device_for_each_child(dev, (void *)1, do_sas_phy_delete);
 302}
 303EXPORT_SYMBOL(sas_remove_children);
 304
 305/**
 306 * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
 307 * @shost:	Scsi Host that is torn down
 308 *
 309 * Removes all SAS PHYs and remote PHYs for a given Scsi_Host and remove the
 310 * Scsi_Host as well.
 311 *
 312 * Note: Do not call scsi_remove_host() on the Scsi_Host any more, as it is
 313 * already removed.
 314 */
 315void sas_remove_host(struct Scsi_Host *shost)
 316{
 317	sas_remove_children(&shost->shost_gendev);
 318	scsi_remove_host(shost);
 319}
 320EXPORT_SYMBOL(sas_remove_host);
 321
 322/**
 323 * sas_get_address - return the SAS address of the device
 324 * @sdev: scsi device
 325 *
 326 * Returns the SAS address of the scsi device
 327 */
 328u64 sas_get_address(struct scsi_device *sdev)
 329{
 330	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 331
 332	return rdev->rphy.identify.sas_address;
 333}
 334EXPORT_SYMBOL(sas_get_address);
 335
 336/**
 337 * sas_tlr_supported - checking TLR bit in vpd 0x90
 338 * @sdev: scsi device struct
 339 *
 340 * Check Transport Layer Retries are supported or not.
 341 * If vpd page 0x90 is present, TRL is supported.
 342 *
 343 */
 344unsigned int
 345sas_tlr_supported(struct scsi_device *sdev)
 346{
 347	const int vpd_len = 32;
 348	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 349	char *buffer = kzalloc(vpd_len, GFP_KERNEL);
 350	int ret = 0;
 351
 352	if (!buffer)
 353		goto out;
 354
 355	if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
 356		goto out;
 357
 358	/*
 359	 * Magic numbers: the VPD Protocol page (0x90)
 360	 * has a 4 byte header and then one entry per device port
 361	 * the TLR bit is at offset 8 on each port entry
 362	 * if we take the first port, that's at total offset 12
 363	 */
 364	ret = buffer[12] & 0x01;
 365
 366 out:
 367	kfree(buffer);
 368	rdev->tlr_supported = ret;
 369	return ret;
 370
 371}
 372EXPORT_SYMBOL_GPL(sas_tlr_supported);
 373
 374/**
 375 * sas_disable_tlr - setting TLR flags
 376 * @sdev: scsi device struct
 377 *
 378 * Seting tlr_enabled flag to 0.
 379 *
 380 */
 381void
 382sas_disable_tlr(struct scsi_device *sdev)
 383{
 384	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 385
 386	rdev->tlr_enabled = 0;
 387}
 388EXPORT_SYMBOL_GPL(sas_disable_tlr);
 389
 390/**
 391 * sas_enable_tlr - setting TLR flags
 392 * @sdev: scsi device struct
 393 *
 394 * Seting tlr_enabled flag 1.
 395 *
 396 */
 397void sas_enable_tlr(struct scsi_device *sdev)
 398{
 399	unsigned int tlr_supported = 0;
 400	tlr_supported  = sas_tlr_supported(sdev);
 401
 402	if (tlr_supported) {
 403		struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 404
 405		rdev->tlr_enabled = 1;
 406	}
 407
 408	return;
 409}
 410EXPORT_SYMBOL_GPL(sas_enable_tlr);
 411
 412unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
 413{
 414	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 415	return rdev->tlr_enabled;
 416}
 417EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 418
 419/*
 420 * SAS Phy attributes
 421 */
 422
 423#define sas_phy_show_simple(field, name, format_string, cast)		\
 424static ssize_t								\
 425show_sas_phy_##name(struct device *dev, 				\
 426		    struct device_attribute *attr, char *buf)		\
 427{									\
 428	struct sas_phy *phy = transport_class_to_phy(dev);		\
 429									\
 430	return snprintf(buf, 20, format_string, cast phy->field);	\
 431}
 432
 433#define sas_phy_simple_attr(field, name, format_string, type)		\
 434	sas_phy_show_simple(field, name, format_string, (type))	\
 435static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 436
 437#define sas_phy_show_protocol(field, name)				\
 438static ssize_t								\
 439show_sas_phy_##name(struct device *dev, 				\
 440		    struct device_attribute *attr, char *buf)		\
 441{									\
 442	struct sas_phy *phy = transport_class_to_phy(dev);		\
 443									\
 444	if (!phy->field)						\
 445		return snprintf(buf, 20, "none\n");			\
 446	return get_sas_protocol_names(phy->field, buf);		\
 447}
 448
 449#define sas_phy_protocol_attr(field, name)				\
 450	sas_phy_show_protocol(field, name)				\
 451static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 452
 453#define sas_phy_show_linkspeed(field)					\
 454static ssize_t								\
 455show_sas_phy_##field(struct device *dev, 				\
 456		     struct device_attribute *attr, char *buf)		\
 457{									\
 458	struct sas_phy *phy = transport_class_to_phy(dev);		\
 459									\
 460	return get_sas_linkspeed_names(phy->field, buf);		\
 461}
 462
 463/* Fudge to tell if we're minimum or maximum */
 464#define sas_phy_store_linkspeed(field)					\
 465static ssize_t								\
 466store_sas_phy_##field(struct device *dev, 				\
 467		      struct device_attribute *attr, 			\
 468		      const char *buf,	size_t count)			\
 469{									\
 470	struct sas_phy *phy = transport_class_to_phy(dev);		\
 471	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
 472	struct sas_internal *i = to_sas_internal(shost->transportt);	\
 473	u32 value;							\
 474	struct sas_phy_linkrates rates = {0};				\
 475	int error;							\
 476									\
 477	error = set_sas_linkspeed_names(&value, buf);			\
 478	if (error)							\
 479		return error;						\
 480	rates.field = value;						\
 481	error = i->f->set_phy_speed(phy, &rates);			\
 482									\
 483	return error ? error : count;					\
 484}
 485
 486#define sas_phy_linkspeed_rw_attr(field)				\
 487	sas_phy_show_linkspeed(field)					\
 488	sas_phy_store_linkspeed(field)					\
 489static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,		\
 490	store_sas_phy_##field)
 491
 492#define sas_phy_linkspeed_attr(field)					\
 493	sas_phy_show_linkspeed(field)					\
 494static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 495
 496
 497#define sas_phy_show_linkerror(field)					\
 498static ssize_t								\
 499show_sas_phy_##field(struct device *dev, 				\
 500		     struct device_attribute *attr, char *buf)		\
 501{									\
 502	struct sas_phy *phy = transport_class_to_phy(dev);		\
 503	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
 504	struct sas_internal *i = to_sas_internal(shost->transportt);	\
 505	int error;							\
 506									\
 507	error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;	\
 508	if (error)							\
 509		return error;						\
 510	return snprintf(buf, 20, "%u\n", phy->field);			\
 511}
 512
 513#define sas_phy_linkerror_attr(field)					\
 514	sas_phy_show_linkerror(field)					\
 515static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 516
 517
 518static ssize_t
 519show_sas_device_type(struct device *dev,
 520		     struct device_attribute *attr, char *buf)
 521{
 522	struct sas_phy *phy = transport_class_to_phy(dev);
 523
 524	if (!phy->identify.device_type)
 525		return snprintf(buf, 20, "none\n");
 526	return get_sas_device_type_names(phy->identify.device_type, buf);
 527}
 528static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 529
 530static ssize_t do_sas_phy_enable(struct device *dev,
 531		size_t count, int enable)
 532{
 533	struct sas_phy *phy = transport_class_to_phy(dev);
 534	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 535	struct sas_internal *i = to_sas_internal(shost->transportt);
 536	int error;
 537
 538	error = i->f->phy_enable(phy, enable);
 539	if (error)
 540		return error;
 541	phy->enabled = enable;
 542	return count;
 543};
 544
 545static ssize_t
 546store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 547		     const char *buf, size_t count)
 548{
 549	if (count < 1)
 550		return -EINVAL;
 551
 552	switch (buf[0]) {
 553	case '0':
 554		do_sas_phy_enable(dev, count, 0);
 555		break;
 556	case '1':
 557		do_sas_phy_enable(dev, count, 1);
 558		break;
 559	default:
 560		return -EINVAL;
 561	}
 562
 563	return count;
 564}
 565
 566static ssize_t
 567show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 568		    char *buf)
 569{
 570	struct sas_phy *phy = transport_class_to_phy(dev);
 571
 572	return snprintf(buf, 20, "%d\n", phy->enabled);
 573}
 574
 575static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
 576			 store_sas_phy_enable);
 577
 578static ssize_t
 579do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
 580{
 581	struct sas_phy *phy = transport_class_to_phy(dev);
 582	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 583	struct sas_internal *i = to_sas_internal(shost->transportt);
 584	int error;
 585
 586	error = i->f->phy_reset(phy, hard_reset);
 587	if (error)
 588		return error;
 589	phy->enabled = 1;
 590	return count;
 591};
 592
 593static ssize_t
 594store_sas_link_reset(struct device *dev, struct device_attribute *attr,
 595		     const char *buf, size_t count)
 596{
 597	return do_sas_phy_reset(dev, count, 0);
 598}
 599static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 600
 601static ssize_t
 602store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
 603		     const char *buf, size_t count)
 604{
 605	return do_sas_phy_reset(dev, count, 1);
 606}
 607static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 608
 609sas_phy_protocol_attr(identify.initiator_port_protocols,
 610		initiator_port_protocols);
 611sas_phy_protocol_attr(identify.target_port_protocols,
 612		target_port_protocols);
 613sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 614		unsigned long long);
 615sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 616sas_phy_linkspeed_attr(negotiated_linkrate);
 617sas_phy_linkspeed_attr(minimum_linkrate_hw);
 618sas_phy_linkspeed_rw_attr(minimum_linkrate);
 619sas_phy_linkspeed_attr(maximum_linkrate_hw);
 620sas_phy_linkspeed_rw_attr(maximum_linkrate);
 621sas_phy_linkerror_attr(invalid_dword_count);
 622sas_phy_linkerror_attr(running_disparity_error_count);
 623sas_phy_linkerror_attr(loss_of_dword_sync_count);
 624sas_phy_linkerror_attr(phy_reset_problem_count);
 625
 626static int sas_phy_setup(struct transport_container *tc, struct device *dev,
 627			 struct device *cdev)
 628{
 629	struct sas_phy *phy = dev_to_phy(dev);
 630	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 631	struct sas_internal *i = to_sas_internal(shost->transportt);
 632
 633	if (i->f->phy_setup)
 634		i->f->phy_setup(phy);
 635
 636	return 0;
 637}
 638
 639static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 640		"sas_phy", sas_phy_setup, NULL, NULL);
 641
 642static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 643{
 644	struct Scsi_Host *shost;
 645	struct sas_internal *i;
 646
 647	if (!scsi_is_sas_phy(dev))
 648		return 0;
 649	shost = dev_to_shost(dev->parent);
 650
 651	if (!shost->transportt)
 652		return 0;
 653	if (shost->transportt->host_attrs.ac.class !=
 654			&sas_host_class.class)
 655		return 0;
 656
 657	i = to_sas_internal(shost->transportt);
 658	return &i->phy_attr_cont.ac == cont;
 659}
 660
 661static void sas_phy_release(struct device *dev)
 662{
 663	struct sas_phy *phy = dev_to_phy(dev);
 664	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 665	struct sas_internal *i = to_sas_internal(shost->transportt);
 666
 667	if (i->f->phy_release)
 668		i->f->phy_release(phy);
 669	put_device(dev->parent);
 670	kfree(phy);
 671}
 672
 673/**
 674 * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
 675 * @parent:	Parent device
 676 * @number:	Phy index
 677 *
 678 * Allocates an SAS PHY structure.  It will be added in the device tree
 679 * below the device specified by @parent, which has to be either a Scsi_Host
 680 * or sas_rphy.
 681 *
 682 * Returns:
 683 *	SAS PHY allocated or %NULL if the allocation failed.
 684 */
 685struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 686{
 687	struct Scsi_Host *shost = dev_to_shost(parent);
 688	struct sas_phy *phy;
 689
 690	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
 691	if (!phy)
 692		return NULL;
 693
 694	phy->number = number;
 695	phy->enabled = 1;
 696
 697	device_initialize(&phy->dev);
 698	phy->dev.parent = get_device(parent);
 699	phy->dev.release = sas_phy_release;
 700	INIT_LIST_HEAD(&phy->port_siblings);
 701	if (scsi_is_sas_expander_device(parent)) {
 702		struct sas_rphy *rphy = dev_to_rphy(parent);
 703		dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
 704			rphy->scsi_target_id, number);
 705	} else
 706		dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
 707
 708	transport_setup_device(&phy->dev);
 709
 710	return phy;
 711}
 712EXPORT_SYMBOL(sas_phy_alloc);
 713
 714/**
 715 * sas_phy_add  -  add a SAS PHY to the device hierarchy
 716 * @phy:	The PHY to be added
 717 *
 718 * Publishes a SAS PHY to the rest of the system.
 719 */
 720int sas_phy_add(struct sas_phy *phy)
 721{
 722	int error;
 723
 724	error = device_add(&phy->dev);
 725	if (error)
 726		return error;
 727
 728	error = transport_add_device(&phy->dev);
 729	if (error) {
 730		device_del(&phy->dev);
 731		return error;
 732	}
 733	transport_configure_device(&phy->dev);
 734
 735	return 0;
 736}
 737EXPORT_SYMBOL(sas_phy_add);
 738
 739/**
 740 * sas_phy_free  -  free a SAS PHY
 741 * @phy:	SAS PHY to free
 742 *
 743 * Frees the specified SAS PHY.
 744 *
 745 * Note:
 746 *   This function must only be called on a PHY that has not
 747 *   successfully been added using sas_phy_add().
 748 */
 749void sas_phy_free(struct sas_phy *phy)
 750{
 751	transport_destroy_device(&phy->dev);
 752	put_device(&phy->dev);
 753}
 754EXPORT_SYMBOL(sas_phy_free);
 755
 756/**
 757 * sas_phy_delete  -  remove SAS PHY
 758 * @phy:	SAS PHY to remove
 759 *
 760 * Removes the specified SAS PHY.  If the SAS PHY has an
 761 * associated remote PHY it is removed before.
 762 */
 763void
 764sas_phy_delete(struct sas_phy *phy)
 765{
 766	struct device *dev = &phy->dev;
 767
 768	/* this happens if the phy is still part of a port when deleted */
 769	BUG_ON(!list_empty(&phy->port_siblings));
 770
 771	transport_remove_device(dev);
 772	device_del(dev);
 773	transport_destroy_device(dev);
 774	put_device(dev);
 775}
 776EXPORT_SYMBOL(sas_phy_delete);
 777
 778/**
 779 * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
 780 * @dev:	device to check
 781 *
 782 * Returns:
 783 *	%1 if the device represents a SAS PHY, %0 else
 784 */
 785int scsi_is_sas_phy(const struct device *dev)
 786{
 787	return dev->release == sas_phy_release;
 788}
 789EXPORT_SYMBOL(scsi_is_sas_phy);
 790
 791/*
 792 * SAS Port attributes
 793 */
 794#define sas_port_show_simple(field, name, format_string, cast)		\
 795static ssize_t								\
 796show_sas_port_##name(struct device *dev, 				\
 797		     struct device_attribute *attr, char *buf)		\
 798{									\
 799	struct sas_port *port = transport_class_to_sas_port(dev);	\
 800									\
 801	return snprintf(buf, 20, format_string, cast port->field);	\
 802}
 803
 804#define sas_port_simple_attr(field, name, format_string, type)		\
 805	sas_port_show_simple(field, name, format_string, (type))	\
 806static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
 807
 808sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
 809
 810static DECLARE_TRANSPORT_CLASS(sas_port_class,
 811			       "sas_port", NULL, NULL, NULL);
 812
 813static int sas_port_match(struct attribute_container *cont, struct device *dev)
 814{
 815	struct Scsi_Host *shost;
 816	struct sas_internal *i;
 817
 818	if (!scsi_is_sas_port(dev))
 819		return 0;
 820	shost = dev_to_shost(dev->parent);
 821
 822	if (!shost->transportt)
 823		return 0;
 824	if (shost->transportt->host_attrs.ac.class !=
 825			&sas_host_class.class)
 826		return 0;
 827
 828	i = to_sas_internal(shost->transportt);
 829	return &i->port_attr_cont.ac == cont;
 830}
 831
 832
 833static void sas_port_release(struct device *dev)
 834{
 835	struct sas_port *port = dev_to_sas_port(dev);
 836
 837	BUG_ON(!list_empty(&port->phy_list));
 838
 839	put_device(dev->parent);
 840	kfree(port);
 841}
 842
 843static void sas_port_create_link(struct sas_port *port,
 844				 struct sas_phy *phy)
 845{
 846	int res;
 847
 848	res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
 849				dev_name(&phy->dev));
 850	if (res)
 851		goto err;
 852	res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
 853	if (res)
 854		goto err;
 855	return;
 856err:
 857	printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
 858	       __func__, res);
 859}
 860
 861static void sas_port_delete_link(struct sas_port *port,
 862				 struct sas_phy *phy)
 863{
 864	sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
 865	sysfs_remove_link(&phy->dev.kobj, "port");
 866}
 867
 868/** sas_port_alloc - allocate and initialize a SAS port structure
 869 *
 870 * @parent:	parent device
 871 * @port_id:	port number
 872 *
 873 * Allocates a SAS port structure.  It will be added to the device tree
 874 * below the device specified by @parent which must be either a Scsi_Host
 875 * or a sas_expander_device.
 876 *
 877 * Returns %NULL on error
 878 */
 879struct sas_port *sas_port_alloc(struct device *parent, int port_id)
 880{
 881	struct Scsi_Host *shost = dev_to_shost(parent);
 882	struct sas_port *port;
 883
 884	port = kzalloc(sizeof(*port), GFP_KERNEL);
 885	if (!port)
 886		return NULL;
 887
 888	port->port_identifier = port_id;
 889
 890	device_initialize(&port->dev);
 891
 892	port->dev.parent = get_device(parent);
 893	port->dev.release = sas_port_release;
 894
 895	mutex_init(&port->phy_list_mutex);
 896	INIT_LIST_HEAD(&port->phy_list);
 897
 898	if (scsi_is_sas_expander_device(parent)) {
 899		struct sas_rphy *rphy = dev_to_rphy(parent);
 900		dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
 901			     rphy->scsi_target_id, port->port_identifier);
 902	} else
 903		dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
 904			     port->port_identifier);
 905
 906	transport_setup_device(&port->dev);
 907
 908	return port;
 909}
 910EXPORT_SYMBOL(sas_port_alloc);
 911
 912/** sas_port_alloc_num - allocate and initialize a SAS port structure
 913 *
 914 * @parent:	parent device
 915 *
 916 * Allocates a SAS port structure and a number to go with it.  This
 917 * interface is really for adapters where the port number has no
 918 * meansing, so the sas class should manage them.  It will be added to
 919 * the device tree below the device specified by @parent which must be
 920 * either a Scsi_Host or a sas_expander_device.
 921 *
 922 * Returns %NULL on error
 923 */
 924struct sas_port *sas_port_alloc_num(struct device *parent)
 925{
 926	int index;
 927	struct Scsi_Host *shost = dev_to_shost(parent);
 928	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 929
 930	/* FIXME: use idr for this eventually */
 931	mutex_lock(&sas_host->lock);
 932	if (scsi_is_sas_expander_device(parent)) {
 933		struct sas_rphy *rphy = dev_to_rphy(parent);
 934		struct sas_expander_device *exp = rphy_to_expander_device(rphy);
 935
 936		index = exp->next_port_id++;
 937	} else
 938		index = sas_host->next_port_id++;
 939	mutex_unlock(&sas_host->lock);
 940	return sas_port_alloc(parent, index);
 941}
 942EXPORT_SYMBOL(sas_port_alloc_num);
 943
 944/**
 945 * sas_port_add - add a SAS port to the device hierarchy
 946 * @port:	port to be added
 947 *
 948 * publishes a port to the rest of the system
 949 */
 950int sas_port_add(struct sas_port *port)
 951{
 952	int error;
 953
 954	/* No phys should be added until this is made visible */
 955	BUG_ON(!list_empty(&port->phy_list));
 956
 957	error = device_add(&port->dev);
 958
 959	if (error)
 960		return error;
 961
 962	transport_add_device(&port->dev);
 963	transport_configure_device(&port->dev);
 964
 965	return 0;
 966}
 967EXPORT_SYMBOL(sas_port_add);
 968
 969/**
 970 * sas_port_free  -  free a SAS PORT
 971 * @port:	SAS PORT to free
 972 *
 973 * Frees the specified SAS PORT.
 974 *
 975 * Note:
 976 *   This function must only be called on a PORT that has not
 977 *   successfully been added using sas_port_add().
 978 */
 979void sas_port_free(struct sas_port *port)
 980{
 981	transport_destroy_device(&port->dev);
 982	put_device(&port->dev);
 983}
 984EXPORT_SYMBOL(sas_port_free);
 985
 986/**
 987 * sas_port_delete  -  remove SAS PORT
 988 * @port:	SAS PORT to remove
 989 *
 990 * Removes the specified SAS PORT.  If the SAS PORT has an
 991 * associated phys, unlink them from the port as well.
 992 */
 993void sas_port_delete(struct sas_port *port)
 994{
 995	struct device *dev = &port->dev;
 996	struct sas_phy *phy, *tmp_phy;
 997
 998	if (port->rphy) {
 999		sas_rphy_delete(port->rphy);
1000		port->rphy = NULL;
1001	}
1002
1003	mutex_lock(&port->phy_list_mutex);
1004	list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
1005				 port_siblings) {
1006		sas_port_delete_link(port, phy);
1007		list_del_init(&phy->port_siblings);
1008	}
1009	mutex_unlock(&port->phy_list_mutex);
1010
1011	if (port->is_backlink) {
1012		struct device *parent = port->dev.parent;
1013
1014		sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1015		port->is_backlink = 0;
1016	}
1017
1018	transport_remove_device(dev);
1019	device_del(dev);
1020	transport_destroy_device(dev);
1021	put_device(dev);
1022}
1023EXPORT_SYMBOL(sas_port_delete);
1024
1025/**
1026 * scsi_is_sas_port -  check if a struct device represents a SAS port
1027 * @dev:	device to check
1028 *
1029 * Returns:
1030 *	%1 if the device represents a SAS Port, %0 else
1031 */
1032int scsi_is_sas_port(const struct device *dev)
1033{
1034	return dev->release == sas_port_release;
1035}
1036EXPORT_SYMBOL(scsi_is_sas_port);
1037
1038/**
1039 * sas_port_get_phy - try to take a reference on a port member
1040 * @port: port to check
1041 */
1042struct sas_phy *sas_port_get_phy(struct sas_port *port)
1043{
1044	struct sas_phy *phy;
1045
1046	mutex_lock(&port->phy_list_mutex);
1047	if (list_empty(&port->phy_list))
1048		phy = NULL;
1049	else {
1050		struct list_head *ent = port->phy_list.next;
1051
1052		phy = list_entry(ent, typeof(*phy), port_siblings);
1053		get_device(&phy->dev);
1054	}
1055	mutex_unlock(&port->phy_list_mutex);
1056
1057	return phy;
1058}
1059EXPORT_SYMBOL(sas_port_get_phy);
1060
1061/**
1062 * sas_port_add_phy - add another phy to a port to form a wide port
1063 * @port:	port to add the phy to
1064 * @phy:	phy to add
1065 *
1066 * When a port is initially created, it is empty (has no phys).  All
1067 * ports must have at least one phy to operated, and all wide ports
1068 * must have at least two.  The current code makes no difference
1069 * between ports and wide ports, but the only object that can be
1070 * connected to a remote device is a port, so ports must be formed on
1071 * all devices with phys if they're connected to anything.
1072 */
1073void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1074{
1075	mutex_lock(&port->phy_list_mutex);
1076	if (unlikely(!list_empty(&phy->port_siblings))) {
1077		/* make sure we're already on this port */
1078		struct sas_phy *tmp;
1079
1080		list_for_each_entry(tmp, &port->phy_list, port_siblings)
1081			if (tmp == phy)
1082				break;
1083		/* If this trips, you added a phy that was already
1084		 * part of a different port */
1085		if (unlikely(tmp != phy)) {
1086			dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1087				   dev_name(&phy->dev));
1088			BUG();
1089		}
1090	} else {
1091		sas_port_create_link(port, phy);
1092		list_add_tail(&phy->port_siblings, &port->phy_list);
1093		port->num_phys++;
1094	}
1095	mutex_unlock(&port->phy_list_mutex);
1096}
1097EXPORT_SYMBOL(sas_port_add_phy);
1098
1099/**
1100 * sas_port_delete_phy - remove a phy from a port or wide port
1101 * @port:	port to remove the phy from
1102 * @phy:	phy to remove
1103 *
1104 * This operation is used for tearing down ports again.  It must be
1105 * done to every port or wide port before calling sas_port_delete.
1106 */
1107void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1108{
1109	mutex_lock(&port->phy_list_mutex);
1110	sas_port_delete_link(port, phy);
1111	list_del_init(&phy->port_siblings);
1112	port->num_phys--;
1113	mutex_unlock(&port->phy_list_mutex);
1114}
1115EXPORT_SYMBOL(sas_port_delete_phy);
1116
1117void sas_port_mark_backlink(struct sas_port *port)
1118{
1119	int res;
1120	struct device *parent = port->dev.parent->parent->parent;
1121
1122	if (port->is_backlink)
1123		return;
1124	port->is_backlink = 1;
1125	res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1126				dev_name(parent));
1127	if (res)
1128		goto err;
1129	return;
1130err:
1131	printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1132	       __func__, res);
1133
1134}
1135EXPORT_SYMBOL(sas_port_mark_backlink);
1136
1137/*
1138 * SAS remote PHY attributes.
1139 */
1140
1141#define sas_rphy_show_simple(field, name, format_string, cast)		\
1142static ssize_t								\
1143show_sas_rphy_##name(struct device *dev, 				\
1144		     struct device_attribute *attr, char *buf)		\
1145{									\
1146	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1147									\
1148	return snprintf(buf, 20, format_string, cast rphy->field);	\
1149}
1150
1151#define sas_rphy_simple_attr(field, name, format_string, type)		\
1152	sas_rphy_show_simple(field, name, format_string, (type))	\
1153static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, 			\
1154		show_sas_rphy_##name, NULL)
1155
1156#define sas_rphy_show_protocol(field, name)				\
1157static ssize_t								\
1158show_sas_rphy_##name(struct device *dev, 				\
1159		     struct device_attribute *attr, char *buf)		\
1160{									\
1161	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1162									\
1163	if (!rphy->field)					\
1164		return snprintf(buf, 20, "none\n");			\
1165	return get_sas_protocol_names(rphy->field, buf);	\
1166}
1167
1168#define sas_rphy_protocol_attr(field, name)				\
1169	sas_rphy_show_protocol(field, name)				\
1170static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,			\
1171		show_sas_rphy_##name, NULL)
1172
1173static ssize_t
1174show_sas_rphy_device_type(struct device *dev,
1175			  struct device_attribute *attr, char *buf)
1176{
1177	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1178
1179	if (!rphy->identify.device_type)
1180		return snprintf(buf, 20, "none\n");
1181	return get_sas_device_type_names(
1182			rphy->identify.device_type, buf);
1183}
1184
1185static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1186		show_sas_rphy_device_type, NULL);
1187
1188static ssize_t
1189show_sas_rphy_enclosure_identifier(struct device *dev,
1190				   struct device_attribute *attr, char *buf)
1191{
1192	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1193	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1194	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1195	struct sas_internal *i = to_sas_internal(shost->transportt);
1196	u64 identifier;
1197	int error;
1198
1199	error = i->f->get_enclosure_identifier(rphy, &identifier);
1200	if (error)
1201		return error;
1202	return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1203}
1204
1205static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1206		show_sas_rphy_enclosure_identifier, NULL);
1207
1208static ssize_t
1209show_sas_rphy_bay_identifier(struct device *dev,
1210			     struct device_attribute *attr, char *buf)
1211{
1212	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1213	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1214	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1215	struct sas_internal *i = to_sas_internal(shost->transportt);
1216	int val;
1217
1218	val = i->f->get_bay_identifier(rphy);
1219	if (val < 0)
1220		return val;
1221	return sprintf(buf, "%d\n", val);
1222}
1223
1224static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1225		show_sas_rphy_bay_identifier, NULL);
1226
1227sas_rphy_protocol_attr(identify.initiator_port_protocols,
1228		initiator_port_protocols);
1229sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1230sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1231		unsigned long long);
1232sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1233sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
1234
1235/* only need 8 bytes of data plus header (4 or 8) */
1236#define BUF_SIZE 64
1237
1238int sas_read_port_mode_page(struct scsi_device *sdev)
1239{
1240	char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1241	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1242	struct scsi_mode_data mode_data;
1243	int error;
1244
1245	if (!buffer)
1246		return -ENOMEM;
1247
1248	error = scsi_mode_sense(sdev, 1, 0x19, 0, buffer, BUF_SIZE, 30*HZ, 3,
1249				&mode_data, NULL);
1250
1251	if (error)
1252		goto out;
1253
1254	msdata = buffer +  mode_data.header_length +
1255		mode_data.block_descriptor_length;
1256
1257	if (msdata - buffer > BUF_SIZE - 8)
1258		goto out;
1259
1260	error = 0;
1261
1262	rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1263	rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1264	rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1265
1266 out:
1267	kfree(buffer);
1268	return error;
1269}
1270EXPORT_SYMBOL(sas_read_port_mode_page);
1271
1272static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1273			       "sas_end_device", NULL, NULL, NULL);
1274
1275#define sas_end_dev_show_simple(field, name, format_string, cast)	\
1276static ssize_t								\
1277show_sas_end_dev_##name(struct device *dev, 				\
1278			struct device_attribute *attr, char *buf)	\
1279{									\
1280	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1281	struct sas_end_device *rdev = rphy_to_end_device(rphy);		\
1282									\
1283	return snprintf(buf, 20, format_string, cast rdev->field);	\
1284}
1285
1286#define sas_end_dev_simple_attr(field, name, format_string, type)	\
1287	sas_end_dev_show_simple(field, name, format_string, (type))	\
1288static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO, 			\
1289		show_sas_end_dev_##name, NULL)
1290
1291sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1292sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1293			"%d\n", int);
1294sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1295			"%d\n", int);
1296sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1297			"%d\n", int);
1298sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1299			"%d\n", int);
1300
1301static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1302			       "sas_expander", NULL, NULL, NULL);
1303
1304#define sas_expander_show_simple(field, name, format_string, cast)	\
1305static ssize_t								\
1306show_sas_expander_##name(struct device *dev, 				\
1307			 struct device_attribute *attr, char *buf)	\
1308{									\
1309	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1310	struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1311									\
1312	return snprintf(buf, 20, format_string, cast edev->field);	\
1313}
1314
1315#define sas_expander_simple_attr(field, name, format_string, type)	\
1316	sas_expander_show_simple(field, name, format_string, (type))	\
1317static SAS_DEVICE_ATTR(expander, name, S_IRUGO, 			\
1318		show_sas_expander_##name, NULL)
1319
1320sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1321sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1322sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1323sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1324			 "%s\n", char *);
1325sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1326sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1327			 unsigned int);
1328sas_expander_simple_attr(level, level, "%d\n", int);
1329
1330static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1331		"sas_device", NULL, NULL, NULL);
1332
1333static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1334{
1335	struct Scsi_Host *shost;
1336	struct sas_internal *i;
1337
1338	if (!scsi_is_sas_rphy(dev))
1339		return 0;
1340	shost = dev_to_shost(dev->parent->parent);
1341
1342	if (!shost->transportt)
1343		return 0;
1344	if (shost->transportt->host_attrs.ac.class !=
1345			&sas_host_class.class)
1346		return 0;
1347
1348	i = to_sas_internal(shost->transportt);
1349	return &i->rphy_attr_cont.ac == cont;
1350}
1351
1352static int sas_end_dev_match(struct attribute_container *cont,
1353			     struct device *dev)
1354{
1355	struct Scsi_Host *shost;
1356	struct sas_internal *i;
1357	struct sas_rphy *rphy;
1358
1359	if (!scsi_is_sas_rphy(dev))
1360		return 0;
1361	shost = dev_to_shost(dev->parent->parent);
1362	rphy = dev_to_rphy(dev);
1363
1364	if (!shost->transportt)
1365		return 0;
1366	if (shost->transportt->host_attrs.ac.class !=
1367			&sas_host_class.class)
1368		return 0;
1369
1370	i = to_sas_internal(shost->transportt);
1371	return &i->end_dev_attr_cont.ac == cont &&
1372		rphy->identify.device_type == SAS_END_DEVICE;
1373}
1374
1375static int sas_expander_match(struct attribute_container *cont,
1376			      struct device *dev)
1377{
1378	struct Scsi_Host *shost;
1379	struct sas_internal *i;
1380	struct sas_rphy *rphy;
1381
1382	if (!scsi_is_sas_rphy(dev))
1383		return 0;
1384	shost = dev_to_shost(dev->parent->parent);
1385	rphy = dev_to_rphy(dev);
1386
1387	if (!shost->transportt)
1388		return 0;
1389	if (shost->transportt->host_attrs.ac.class !=
1390			&sas_host_class.class)
1391		return 0;
1392
1393	i = to_sas_internal(shost->transportt);
1394	return &i->expander_attr_cont.ac == cont &&
1395		(rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1396		 rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1397}
1398
1399static void sas_expander_release(struct device *dev)
1400{
1401	struct sas_rphy *rphy = dev_to_rphy(dev);
1402	struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1403
1404	put_device(dev->parent);
1405	kfree(edev);
1406}
1407
1408static void sas_end_device_release(struct device *dev)
1409{
1410	struct sas_rphy *rphy = dev_to_rphy(dev);
1411	struct sas_end_device *edev = rphy_to_end_device(rphy);
1412
1413	put_device(dev->parent);
1414	kfree(edev);
1415}
1416
1417/**
1418 * sas_rphy_initialize - common rphy initialization
1419 * @rphy:	rphy to initialise
1420 *
1421 * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1422 * initialise the common rphy component of each.
1423 */
1424static void sas_rphy_initialize(struct sas_rphy *rphy)
1425{
1426	INIT_LIST_HEAD(&rphy->list);
1427}
1428
1429/**
1430 * sas_end_device_alloc - allocate an rphy for an end device
1431 * @parent: which port
1432 *
1433 * Allocates an SAS remote PHY structure, connected to @parent.
1434 *
1435 * Returns:
1436 *	SAS PHY allocated or %NULL if the allocation failed.
1437 */
1438struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1439{
1440	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1441	struct sas_end_device *rdev;
1442
1443	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1444	if (!rdev) {
1445		return NULL;
1446	}
1447
1448	device_initialize(&rdev->rphy.dev);
1449	rdev->rphy.dev.parent = get_device(&parent->dev);
1450	rdev->rphy.dev.release = sas_end_device_release;
1451	if (scsi_is_sas_expander_device(parent->dev.parent)) {
1452		struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1453		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1454			     shost->host_no, rphy->scsi_target_id,
1455			     parent->port_identifier);
1456	} else
1457		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1458			     shost->host_no, parent->port_identifier);
1459	rdev->rphy.identify.device_type = SAS_END_DEVICE;
1460	sas_rphy_initialize(&rdev->rphy);
1461	transport_setup_device(&rdev->rphy.dev);
1462
1463	return &rdev->rphy;
1464}
1465EXPORT_SYMBOL(sas_end_device_alloc);
1466
1467/**
1468 * sas_expander_alloc - allocate an rphy for an end device
1469 * @parent: which port
1470 * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1471 *
1472 * Allocates an SAS remote PHY structure, connected to @parent.
1473 *
1474 * Returns:
1475 *	SAS PHY allocated or %NULL if the allocation failed.
1476 */
1477struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1478				    enum sas_device_type type)
1479{
1480	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1481	struct sas_expander_device *rdev;
1482	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1483
1484	BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1485	       type != SAS_FANOUT_EXPANDER_DEVICE);
1486
1487	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1488	if (!rdev) {
1489		return NULL;
1490	}
1491
1492	device_initialize(&rdev->rphy.dev);
1493	rdev->rphy.dev.parent = get_device(&parent->dev);
1494	rdev->rphy.dev.release = sas_expander_release;
1495	mutex_lock(&sas_host->lock);
1496	rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1497	mutex_unlock(&sas_host->lock);
1498	dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1499		     shost->host_no, rdev->rphy.scsi_target_id);
1500	rdev->rphy.identify.device_type = type;
1501	sas_rphy_initialize(&rdev->rphy);
1502	transport_setup_device(&rdev->rphy.dev);
1503
1504	return &rdev->rphy;
1505}
1506EXPORT_SYMBOL(sas_expander_alloc);
1507
1508/**
1509 * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
1510 * @rphy:	The remote PHY to be added
1511 *
1512 * Publishes a SAS remote PHY to the rest of the system.
1513 */
1514int sas_rphy_add(struct sas_rphy *rphy)
1515{
1516	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1517	struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1518	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1519	struct sas_identify *identify = &rphy->identify;
1520	int error;
1521
1522	if (parent->rphy)
1523		return -ENXIO;
1524	parent->rphy = rphy;
1525
1526	error = device_add(&rphy->dev);
1527	if (error)
1528		return error;
1529	transport_add_device(&rphy->dev);
1530	transport_configure_device(&rphy->dev);
1531	if (sas_bsg_initialize(shost, rphy))
1532		printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1533
1534
1535	mutex_lock(&sas_host->lock);
1536	list_add_tail(&rphy->list, &sas_host->rphy_list);
1537	if (identify->device_type == SAS_END_DEVICE &&
1538	    (identify->target_port_protocols &
1539	     (SAS_PROTOCOL_SSP | SAS_PROTOCOL_STP | SAS_PROTOCOL_SATA)))
1540		rphy->scsi_target_id = sas_host->next_target_id++;
1541	else if (identify->device_type == SAS_END_DEVICE)
1542		rphy->scsi_target_id = -1;
1543	mutex_unlock(&sas_host->lock);
1544
1545	if (identify->device_type == SAS_END_DEVICE &&
1546	    rphy->scsi_target_id != -1) {
1547		int lun;
1548
1549		if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1550			lun = SCAN_WILD_CARD;
1551		else
1552			lun = 0;
1553
1554		scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
1555				 SCSI_SCAN_INITIAL);
1556	}
1557
1558	return 0;
1559}
1560EXPORT_SYMBOL(sas_rphy_add);
1561
1562/**
1563 * sas_rphy_free  -  free a SAS remote PHY
1564 * @rphy: SAS remote PHY to free
1565 *
1566 * Frees the specified SAS remote PHY.
1567 *
1568 * Note:
1569 *   This function must only be called on a remote
1570 *   PHY that has not successfully been added using
1571 *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1572 */
1573void sas_rphy_free(struct sas_rphy *rphy)
1574{
1575	struct device *dev = &rphy->dev;
1576	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1577	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1578
1579	mutex_lock(&sas_host->lock);
1580	list_del(&rphy->list);
1581	mutex_unlock(&sas_host->lock);
1582
1583	transport_destroy_device(dev);
1584
1585	put_device(dev);
1586}
1587EXPORT_SYMBOL(sas_rphy_free);
1588
1589/**
1590 * sas_rphy_delete  -  remove and free SAS remote PHY
1591 * @rphy:	SAS remote PHY to remove and free
1592 *
1593 * Removes the specified SAS remote PHY and frees it.
1594 */
1595void
1596sas_rphy_delete(struct sas_rphy *rphy)
1597{
1598	sas_rphy_remove(rphy);
1599	sas_rphy_free(rphy);
1600}
1601EXPORT_SYMBOL(sas_rphy_delete);
1602
1603/**
1604 * sas_rphy_unlink  -  unlink SAS remote PHY
1605 * @rphy:	SAS remote phy to unlink from its parent port
1606 *
1607 * Removes port reference to an rphy
1608 */
1609void sas_rphy_unlink(struct sas_rphy *rphy)
1610{
1611	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1612
1613	parent->rphy = NULL;
1614}
1615EXPORT_SYMBOL(sas_rphy_unlink);
1616
1617/**
1618 * sas_rphy_remove  -  remove SAS remote PHY
1619 * @rphy:	SAS remote phy to remove
1620 *
1621 * Removes the specified SAS remote PHY.
1622 */
1623void
1624sas_rphy_remove(struct sas_rphy *rphy)
1625{
1626	struct device *dev = &rphy->dev;
1627
1628	switch (rphy->identify.device_type) {
1629	case SAS_END_DEVICE:
1630		scsi_remove_target(dev);
1631		break;
1632	case SAS_EDGE_EXPANDER_DEVICE:
1633	case SAS_FANOUT_EXPANDER_DEVICE:
1634		sas_remove_children(dev);
1635		break;
1636	default:
1637		break;
1638	}
1639
1640	sas_rphy_unlink(rphy);
1641	bsg_remove_queue(rphy->q);
1642	transport_remove_device(dev);
1643	device_del(dev);
1644}
1645EXPORT_SYMBOL(sas_rphy_remove);
1646
1647/**
1648 * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
1649 * @dev:	device to check
1650 *
1651 * Returns:
1652 *	%1 if the device represents a SAS remote PHY, %0 else
1653 */
1654int scsi_is_sas_rphy(const struct device *dev)
1655{
1656	return dev->release == sas_end_device_release ||
1657		dev->release == sas_expander_release;
1658}
1659EXPORT_SYMBOL(scsi_is_sas_rphy);
1660
1661
1662/*
1663 * SCSI scan helper
1664 */
1665
1666static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1667		uint id, u64 lun)
1668{
1669	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1670	struct sas_rphy *rphy;
1671
1672	mutex_lock(&sas_host->lock);
1673	list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1674		if (rphy->identify.device_type != SAS_END_DEVICE ||
1675		    rphy->scsi_target_id == -1)
1676			continue;
1677
1678		if ((channel == SCAN_WILD_CARD || channel == 0) &&
1679		    (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1680			scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id,
1681					 lun, SCSI_SCAN_MANUAL);
1682		}
1683	}
1684	mutex_unlock(&sas_host->lock);
1685
1686	return 0;
1687}
1688
1689
1690/*
1691 * Setup / Teardown code
1692 */
1693
1694#define SETUP_TEMPLATE(attrb, field, perm, test)			\
1695	i->private_##attrb[count] = dev_attr_##field;		\
1696	i->private_##attrb[count].attr.mode = perm;			\
1697	i->attrb[count] = &i->private_##attrb[count];			\
1698	if (test)							\
1699		count++
1700
1701#define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)	\
1702	i->private_##attrb[count] = dev_attr_##field;		\
1703	i->private_##attrb[count].attr.mode = perm;			\
1704	if (ro_test) {							\
1705		i->private_##attrb[count].attr.mode = ro_perm;		\
1706		i->private_##attrb[count].store = NULL;			\
1707	}								\
1708	i->attrb[count] = &i->private_##attrb[count];			\
1709	if (test)							\
1710		count++
1711
1712#define SETUP_RPORT_ATTRIBUTE(field) 					\
1713	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1714
1715#define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)			\
1716	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1717
1718#define SETUP_PHY_ATTRIBUTE(field)					\
1719	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1720
1721#define SETUP_PHY_ATTRIBUTE_RW(field)					\
1722	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
1723			!i->f->set_phy_speed, S_IRUGO)
1724
1725#define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)			\
1726	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
1727			  !i->f->func, S_IRUGO)
1728
1729#define SETUP_PORT_ATTRIBUTE(field)					\
1730	SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1731
1732#define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)			\
1733	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1734
1735#define SETUP_PHY_ATTRIBUTE_WRONLY(field)				\
1736	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1737
1738#define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)		\
1739	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1740
1741#define SETUP_END_DEV_ATTRIBUTE(field)					\
1742	SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1743
1744#define SETUP_EXPANDER_ATTRIBUTE(field)					\
1745	SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1746
1747/**
1748 * sas_attach_transport  -  instantiate SAS transport template
1749 * @ft:		SAS transport class function template
1750 */
1751struct scsi_transport_template *
1752sas_attach_transport(struct sas_function_template *ft)
1753{
1754	struct sas_internal *i;
1755	int count;
1756
1757	i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1758	if (!i)
1759		return NULL;
1760
1761	i->t.user_scan = sas_user_scan;
1762
1763	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1764	i->t.host_attrs.ac.class = &sas_host_class.class;
1765	i->t.host_attrs.ac.match = sas_host_match;
1766	transport_container_register(&i->t.host_attrs);
1767	i->t.host_size = sizeof(struct sas_host_attrs);
1768
1769	i->phy_attr_cont.ac.class = &sas_phy_class.class;
1770	i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1771	i->phy_attr_cont.ac.match = sas_phy_match;
1772	transport_container_register(&i->phy_attr_cont);
1773
1774	i->port_attr_cont.ac.class = &sas_port_class.class;
1775	i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1776	i->port_attr_cont.ac.match = sas_port_match;
1777	transport_container_register(&i->port_attr_cont);
1778
1779	i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1780	i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1781	i->rphy_attr_cont.ac.match = sas_rphy_match;
1782	transport_container_register(&i->rphy_attr_cont);
1783
1784	i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1785	i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1786	i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1787	transport_container_register(&i->end_dev_attr_cont);
1788
1789	i->expander_attr_cont.ac.class = &sas_expander_class.class;
1790	i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1791	i->expander_attr_cont.ac.match = sas_expander_match;
1792	transport_container_register(&i->expander_attr_cont);
1793
1794	i->f = ft;
1795
1796	count = 0;
1797	SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1798	SETUP_PHY_ATTRIBUTE(target_port_protocols);
1799	SETUP_PHY_ATTRIBUTE(device_type);
1800	SETUP_PHY_ATTRIBUTE(sas_address);
1801	SETUP_PHY_ATTRIBUTE(phy_identifier);
1802	SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1803	SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1804	SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1805	SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1806	SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1807
1808	SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1809	SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1810	SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1811	SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1812	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1813	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1814	SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1815	i->phy_attrs[count] = NULL;
1816
1817	count = 0;
1818	SETUP_PORT_ATTRIBUTE(num_phys);
1819	i->port_attrs[count] = NULL;
1820
1821	count = 0;
1822	SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1823	SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1824	SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1825	SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1826	SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1827	SETUP_RPORT_ATTRIBUTE(rphy_scsi_target_id);
1828	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1829				       get_enclosure_identifier);
1830	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1831				       get_bay_identifier);
1832	i->rphy_attrs[count] = NULL;
1833
1834	count = 0;
1835	SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1836	SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1837	SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1838	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1839	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1840	i->end_dev_attrs[count] = NULL;
1841
1842	count = 0;
1843	SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1844	SETUP_EXPANDER_ATTRIBUTE(product_id);
1845	SETUP_EXPANDER_ATTRIBUTE(product_rev);
1846	SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1847	SETUP_EXPANDER_ATTRIBUTE(component_id);
1848	SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1849	SETUP_EXPANDER_ATTRIBUTE(level);
1850	i->expander_attrs[count] = NULL;
1851
1852	return &i->t;
1853}
1854EXPORT_SYMBOL(sas_attach_transport);
1855
1856/**
1857 * sas_release_transport  -  release SAS transport template instance
1858 * @t:		transport template instance
1859 */
1860void sas_release_transport(struct scsi_transport_template *t)
1861{
1862	struct sas_internal *i = to_sas_internal(t);
1863
1864	transport_container_unregister(&i->t.host_attrs);
1865	transport_container_unregister(&i->phy_attr_cont);
1866	transport_container_unregister(&i->port_attr_cont);
1867	transport_container_unregister(&i->rphy_attr_cont);
1868	transport_container_unregister(&i->end_dev_attr_cont);
1869	transport_container_unregister(&i->expander_attr_cont);
1870
1871	kfree(i);
1872}
1873EXPORT_SYMBOL(sas_release_transport);
1874
1875static __init int sas_transport_init(void)
1876{
1877	int error;
1878
1879	error = transport_class_register(&sas_host_class);
1880	if (error)
1881		goto out;
1882	error = transport_class_register(&sas_phy_class);
1883	if (error)
1884		goto out_unregister_transport;
1885	error = transport_class_register(&sas_port_class);
1886	if (error)
1887		goto out_unregister_phy;
1888	error = transport_class_register(&sas_rphy_class);
1889	if (error)
1890		goto out_unregister_port;
1891	error = transport_class_register(&sas_end_dev_class);
1892	if (error)
1893		goto out_unregister_rphy;
1894	error = transport_class_register(&sas_expander_class);
1895	if (error)
1896		goto out_unregister_end_dev;
1897
1898	return 0;
1899
1900 out_unregister_end_dev:
1901	transport_class_unregister(&sas_end_dev_class);
1902 out_unregister_rphy:
1903	transport_class_unregister(&sas_rphy_class);
1904 out_unregister_port:
1905	transport_class_unregister(&sas_port_class);
1906 out_unregister_phy:
1907	transport_class_unregister(&sas_phy_class);
1908 out_unregister_transport:
1909	transport_class_unregister(&sas_host_class);
1910 out:
1911	return error;
1912
1913}
1914
1915static void __exit sas_transport_exit(void)
1916{
1917	transport_class_unregister(&sas_host_class);
1918	transport_class_unregister(&sas_phy_class);
1919	transport_class_unregister(&sas_port_class);
1920	transport_class_unregister(&sas_rphy_class);
1921	transport_class_unregister(&sas_end_dev_class);
1922	transport_class_unregister(&sas_expander_class);
1923}
1924
1925MODULE_AUTHOR("Christoph Hellwig");
1926MODULE_DESCRIPTION("SAS Transport Attributes");
1927MODULE_LICENSE("GPL");
1928
1929module_init(sas_transport_init);
1930module_exit(sas_transport_exit);