1/*
   2 * Copyright (C) 2005-2006 Dell Inc.
   3 *	Released under GPL v2.
   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_device.h>
  37#include <scsi/scsi_host.h>
  38#include <scsi/scsi_transport.h>
  39#include <scsi/scsi_transport_sas.h>
  40
  41#include "scsi_sas_internal.h"
  42struct sas_host_attrs {
  43	struct list_head rphy_list;
  44	struct mutex lock;
  45	struct request_queue *q;
  46	u32 next_target_id;
  47	u32 next_expander_id;
  48	int next_port_id;
  49};
  50#define to_sas_host_attrs(host)	((struct sas_host_attrs *)(host)->shost_data)
  51
  52
  53/*
  54 * Hack to allow attributes of the same name in different objects.
  55 */
  56#define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  57	struct device_attribute dev_attr_##_prefix##_##_name = \
  58	__ATTR(_name,_mode,_show,_store)
  59
  60
  61/*
  62 * Pretty printing helpers
  63 */
  64
  65#define sas_bitfield_name_match(title, table)			\
  66static ssize_t							\
  67get_sas_##title##_names(u32 table_key, char *buf)		\
  68{								\
  69	char *prefix = "";					\
  70	ssize_t len = 0;					\
  71	int i;							\
  72								\
  73	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
  74		if (table[i].value & table_key) {		\
  75			len += sprintf(buf + len, "%s%s",	\
  76				prefix, table[i].name);		\
  77			prefix = ", ";				\
  78		}						\
  79	}							\
  80	len += sprintf(buf + len, "\n");			\
  81	return len;						\
  82}
  83
  84#define sas_bitfield_name_set(title, table)			\
  85static ssize_t							\
  86set_sas_##title##_names(u32 *table_key, const char *buf)	\
  87{								\
  88	ssize_t len = 0;					\
  89	int i;							\
  90								\
  91	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
  92		len = strlen(table[i].name);			\
  93		if (strncmp(buf, table[i].name, len) == 0 &&	\
  94		    (buf[len] == '\n' || buf[len] == '\0')) {	\
  95			*table_key = table[i].value;		\
  96			return 0;				\
  97		}						\
  98	}							\
  99	return -EINVAL;						\
 100}
 101
 102#define sas_bitfield_name_search(title, table)			\
 103static ssize_t							\
 104get_sas_##title##_names(u32 table_key, char *buf)		\
 105{								\
 106	ssize_t len = 0;					\
 107	int i;							\
 108								\
 109	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
 110		if (table[i].value == table_key) {		\
 111			len += sprintf(buf + len, "%s",		\
 112				table[i].name);			\
 113			break;					\
 114		}						\
 115	}							\
 116	len += sprintf(buf + len, "\n");			\
 117	return len;						\
 118}
 119
 120static struct {
 121	u32		value;
 122	char		*name;
 123} sas_device_type_names[] = {
 124	{ SAS_PHY_UNUSED,		"unused" },
 125	{ SAS_END_DEVICE,		"end device" },
 126	{ SAS_EDGE_EXPANDER_DEVICE,	"edge expander" },
 127	{ SAS_FANOUT_EXPANDER_DEVICE,	"fanout expander" },
 128};
 129sas_bitfield_name_search(device_type, sas_device_type_names)
 130
 131
 132static struct {
 133	u32		value;
 134	char		*name;
 135} sas_protocol_names[] = {
 136	{ SAS_PROTOCOL_SATA,		"sata" },
 137	{ SAS_PROTOCOL_SMP,		"smp" },
 138	{ SAS_PROTOCOL_STP,		"stp" },
 139	{ SAS_PROTOCOL_SSP,		"ssp" },
 140};
 141sas_bitfield_name_match(protocol, sas_protocol_names)
 142
 143static struct {
 144	u32		value;
 145	char		*name;
 146} sas_linkspeed_names[] = {
 147	{ SAS_LINK_RATE_UNKNOWN,	"Unknown" },
 148	{ SAS_PHY_DISABLED,		"Phy disabled" },
 149	{ SAS_LINK_RATE_FAILED,		"Link Rate failed" },
 150	{ SAS_SATA_SPINUP_HOLD,		"Spin-up hold" },
 151	{ SAS_LINK_RATE_1_5_GBPS,	"1.5 Gbit" },
 152	{ SAS_LINK_RATE_3_0_GBPS,	"3.0 Gbit" },
 153	{ SAS_LINK_RATE_6_0_GBPS,	"6.0 Gbit" },
 154	{ SAS_LINK_RATE_12_0_GBPS,	"12.0 Gbit" },
 155};
 156sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 157sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
 158
 159static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
 160{
 161	struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
 162	struct sas_end_device *rdev;
 163
 164	BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
 165
 166	rdev = rphy_to_end_device(rphy);
 167	return rdev;
 168}
 169
 170static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
 171			    struct sas_rphy *rphy)
 172{
 173	struct request *req;
 174	int ret;
 175	int (*handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
 176
 177	while ((req = blk_fetch_request(q)) != NULL) {
 178		spin_unlock_irq(q->queue_lock);
 179
 180		handler = to_sas_internal(shost->transportt)->f->smp_handler;
 181		ret = handler(shost, rphy, req);
 182		req->errors = ret;
 183
 184		blk_end_request_all(req, ret);
 185
 186		spin_lock_irq(q->queue_lock);
 187	}
 188}
 189
 190static void sas_host_smp_request(struct request_queue *q)
 191{
 192	sas_smp_request(q, (struct Scsi_Host *)q->queuedata, NULL);
 193}
 194
 195static void sas_non_host_smp_request(struct request_queue *q)
 196{
 197	struct sas_rphy *rphy = q->queuedata;
 198	sas_smp_request(q, rphy_to_shost(rphy), rphy);
 199}
 200
 201static void sas_host_release(struct device *dev)
 202{
 203	struct Scsi_Host *shost = dev_to_shost(dev);
 204	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 205	struct request_queue *q = sas_host->q;
 206
 207	if (q)
 208		blk_cleanup_queue(q);
 209}
 210
 211static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
 212{
 213	struct request_queue *q;
 214	int error;
 215	struct device *dev;
 216	char namebuf[20];
 217	const char *name;
 218	void (*release)(struct device *);
 219
 220	if (!to_sas_internal(shost->transportt)->f->smp_handler) {
 221		printk("%s can't handle SMP requests\n", shost->hostt->name);
 222		return 0;
 223	}
 224
 225	if (rphy) {
 226		q = blk_init_queue(sas_non_host_smp_request, NULL);
 227		dev = &rphy->dev;
 228		name = dev_name(dev);
 229		release = NULL;
 230	} else {
 231		q = blk_init_queue(sas_host_smp_request, NULL);
 232		dev = &shost->shost_gendev;
 233		snprintf(namebuf, sizeof(namebuf),
 234			 "sas_host%d", shost->host_no);
 235		name = namebuf;
 236		release = sas_host_release;
 237	}
 238	if (!q)
 239		return -ENOMEM;
 240
 241	error = bsg_register_queue(q, dev, name, release);
 242	if (error) {
 243		blk_cleanup_queue(q);
 244		return -ENOMEM;
 245	}
 246
 247	if (rphy)
 248		rphy->q = q;
 249	else
 250		to_sas_host_attrs(shost)->q = q;
 251
 252	if (rphy)
 253		q->queuedata = rphy;
 254	else
 255		q->queuedata = shost;
 256
 257	queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
 258	return 0;
 259}
 260
 261static void sas_bsg_remove(struct Scsi_Host *shost, struct sas_rphy *rphy)
 262{
 263	struct request_queue *q;
 264
 265	if (rphy)
 266		q = rphy->q;
 267	else
 268		q = to_sas_host_attrs(shost)->q;
 269
 270	if (!q)
 271		return;
 272
 273	bsg_unregister_queue(q);
 274}
 275
 276/*
 277 * SAS host attributes
 278 */
 279
 280static int sas_host_setup(struct transport_container *tc, struct device *dev,
 281			  struct device *cdev)
 282{
 283	struct Scsi_Host *shost = dev_to_shost(dev);
 284	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 285
 286	INIT_LIST_HEAD(&sas_host->rphy_list);
 287	mutex_init(&sas_host->lock);
 288	sas_host->next_target_id = 0;
 289	sas_host->next_expander_id = 0;
 290	sas_host->next_port_id = 0;
 291
 292	if (sas_bsg_initialize(shost, NULL))
 293		dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
 294			   shost->host_no);
 295
 296	return 0;
 297}
 298
 299static int sas_host_remove(struct transport_container *tc, struct device *dev,
 300			   struct device *cdev)
 301{
 302	struct Scsi_Host *shost = dev_to_shost(dev);
 303
 304	sas_bsg_remove(shost, NULL);
 305
 306	return 0;
 307}
 308
 309static DECLARE_TRANSPORT_CLASS(sas_host_class,
 310		"sas_host", sas_host_setup, sas_host_remove, NULL);
 311
 312static int sas_host_match(struct attribute_container *cont,
 313			    struct device *dev)
 314{
 315	struct Scsi_Host *shost;
 316	struct sas_internal *i;
 317
 318	if (!scsi_is_host_device(dev))
 319		return 0;
 320	shost = dev_to_shost(dev);
 321
 322	if (!shost->transportt)
 323		return 0;
 324	if (shost->transportt->host_attrs.ac.class !=
 325			&sas_host_class.class)
 326		return 0;
 327
 328	i = to_sas_internal(shost->transportt);
 329	return &i->t.host_attrs.ac == cont;
 330}
 331
 332static int do_sas_phy_delete(struct device *dev, void *data)
 333{
 334	int pass = (int)(unsigned long)data;
 335
 336	if (pass == 0 && scsi_is_sas_port(dev))
 337		sas_port_delete(dev_to_sas_port(dev));
 338	else if (pass == 1 && scsi_is_sas_phy(dev))
 339		sas_phy_delete(dev_to_phy(dev));
 340	return 0;
 341}
 342
 343/**
 344 * is_sas_attached - check if device is SAS attached
 345 * @sdev: scsi device to check
 346 *
 347 * returns true if the device is SAS attached
 348 */
 349int is_sas_attached(struct scsi_device *sdev)
 350{
 351	struct Scsi_Host *shost = sdev->host;
 352
 353	return shost->transportt->host_attrs.ac.class ==
 354		&sas_host_class.class;
 355}
 356EXPORT_SYMBOL(is_sas_attached);
 357
 358
 359/**
 360 * sas_remove_children  -  tear down a devices SAS data structures
 361 * @dev:	device belonging to the sas object
 362 *
 363 * Removes all SAS PHYs and remote PHYs for a given object
 364 */
 365void sas_remove_children(struct device *dev)
 366{
 367	device_for_each_child(dev, (void *)0, do_sas_phy_delete);
 368	device_for_each_child(dev, (void *)1, do_sas_phy_delete);
 369}
 370EXPORT_SYMBOL(sas_remove_children);
 371
 372/**
 373 * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
 374 * @shost:	Scsi Host that is torn down
 375 *
 376 * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
 377 * Must be called just before scsi_remove_host for SAS HBAs.
 378 */
 379void sas_remove_host(struct Scsi_Host *shost)
 380{
 381	sas_remove_children(&shost->shost_gendev);
 382}
 383EXPORT_SYMBOL(sas_remove_host);
 384
 385/**
 386 * sas_get_address - return the SAS address of the device
 387 * @sdev: scsi device
 388 *
 389 * Returns the SAS address of the scsi device
 390 */
 391u64 sas_get_address(struct scsi_device *sdev)
 392{
 393	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 394
 395	return rdev->rphy.identify.sas_address;
 396}
 397EXPORT_SYMBOL(sas_get_address);
 398
 399/**
 400 * sas_tlr_supported - checking TLR bit in vpd 0x90
 401 * @sdev: scsi device struct
 402 *
 403 * Check Transport Layer Retries are supported or not.
 404 * If vpd page 0x90 is present, TRL is supported.
 405 *
 406 */
 407unsigned int
 408sas_tlr_supported(struct scsi_device *sdev)
 409{
 410	const int vpd_len = 32;
 411	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 412	char *buffer = kzalloc(vpd_len, GFP_KERNEL);
 413	int ret = 0;
 414
 415	if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
 416		goto out;
 417
 418	/*
 419	 * Magic numbers: the VPD Protocol page (0x90)
 420	 * has a 4 byte header and then one entry per device port
 421	 * the TLR bit is at offset 8 on each port entry
 422	 * if we take the first port, that's at total offset 12
 423	 */
 424	ret = buffer[12] & 0x01;
 425
 426 out:
 427	kfree(buffer);
 428	rdev->tlr_supported = ret;
 429	return ret;
 430
 431}
 432EXPORT_SYMBOL_GPL(sas_tlr_supported);
 433
 434/**
 435 * sas_disable_tlr - setting TLR flags
 436 * @sdev: scsi device struct
 437 *
 438 * Seting tlr_enabled flag to 0.
 439 *
 440 */
 441void
 442sas_disable_tlr(struct scsi_device *sdev)
 443{
 444	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 445
 446	rdev->tlr_enabled = 0;
 447}
 448EXPORT_SYMBOL_GPL(sas_disable_tlr);
 449
 450/**
 451 * sas_enable_tlr - setting TLR flags
 452 * @sdev: scsi device struct
 453 *
 454 * Seting tlr_enabled flag 1.
 455 *
 456 */
 457void sas_enable_tlr(struct scsi_device *sdev)
 458{
 459	unsigned int tlr_supported = 0;
 460	tlr_supported  = sas_tlr_supported(sdev);
 461
 462	if (tlr_supported) {
 463		struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 464
 465		rdev->tlr_enabled = 1;
 466	}
 467
 468	return;
 469}
 470EXPORT_SYMBOL_GPL(sas_enable_tlr);
 471
 472unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
 473{
 474	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 475	return rdev->tlr_enabled;
 476}
 477EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
 478
 479/*
 480 * SAS Phy attributes
 481 */
 482
 483#define sas_phy_show_simple(field, name, format_string, cast)		\
 484static ssize_t								\
 485show_sas_phy_##name(struct device *dev, 				\
 486		    struct device_attribute *attr, char *buf)		\
 487{									\
 488	struct sas_phy *phy = transport_class_to_phy(dev);		\
 489									\
 490	return snprintf(buf, 20, format_string, cast phy->field);	\
 491}
 492
 493#define sas_phy_simple_attr(field, name, format_string, type)		\
 494	sas_phy_show_simple(field, name, format_string, (type))	\
 495static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 496
 497#define sas_phy_show_protocol(field, name)				\
 498static ssize_t								\
 499show_sas_phy_##name(struct device *dev, 				\
 500		    struct device_attribute *attr, char *buf)		\
 501{									\
 502	struct sas_phy *phy = transport_class_to_phy(dev);		\
 503									\
 504	if (!phy->field)						\
 505		return snprintf(buf, 20, "none\n");			\
 506	return get_sas_protocol_names(phy->field, buf);		\
 507}
 508
 509#define sas_phy_protocol_attr(field, name)				\
 510	sas_phy_show_protocol(field, name)				\
 511static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 512
 513#define sas_phy_show_linkspeed(field)					\
 514static ssize_t								\
 515show_sas_phy_##field(struct device *dev, 				\
 516		     struct device_attribute *attr, char *buf)		\
 517{									\
 518	struct sas_phy *phy = transport_class_to_phy(dev);		\
 519									\
 520	return get_sas_linkspeed_names(phy->field, buf);		\
 521}
 522
 523/* Fudge to tell if we're minimum or maximum */
 524#define sas_phy_store_linkspeed(field)					\
 525static ssize_t								\
 526store_sas_phy_##field(struct device *dev, 				\
 527		      struct device_attribute *attr, 			\
 528		      const char *buf,	size_t count)			\
 529{									\
 530	struct sas_phy *phy = transport_class_to_phy(dev);		\
 531	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
 532	struct sas_internal *i = to_sas_internal(shost->transportt);	\
 533	u32 value;							\
 534	struct sas_phy_linkrates rates = {0};				\
 535	int error;							\
 536									\
 537	error = set_sas_linkspeed_names(&value, buf);			\
 538	if (error)							\
 539		return error;						\
 540	rates.field = value;						\
 541	error = i->f->set_phy_speed(phy, &rates);			\
 542									\
 543	return error ? error : count;					\
 544}
 545
 546#define sas_phy_linkspeed_rw_attr(field)				\
 547	sas_phy_show_linkspeed(field)					\
 548	sas_phy_store_linkspeed(field)					\
 549static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,		\
 550	store_sas_phy_##field)
 551
 552#define sas_phy_linkspeed_attr(field)					\
 553	sas_phy_show_linkspeed(field)					\
 554static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 555
 556
 557#define sas_phy_show_linkerror(field)					\
 558static ssize_t								\
 559show_sas_phy_##field(struct device *dev, 				\
 560		     struct device_attribute *attr, char *buf)		\
 561{									\
 562	struct sas_phy *phy = transport_class_to_phy(dev);		\
 563	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
 564	struct sas_internal *i = to_sas_internal(shost->transportt);	\
 565	int error;							\
 566									\
 567	error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;	\
 568	if (error)							\
 569		return error;						\
 570	return snprintf(buf, 20, "%u\n", phy->field);			\
 571}
 572
 573#define sas_phy_linkerror_attr(field)					\
 574	sas_phy_show_linkerror(field)					\
 575static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 576
 577
 578static ssize_t
 579show_sas_device_type(struct device *dev,
 580		     struct device_attribute *attr, char *buf)
 581{
 582	struct sas_phy *phy = transport_class_to_phy(dev);
 583
 584	if (!phy->identify.device_type)
 585		return snprintf(buf, 20, "none\n");
 586	return get_sas_device_type_names(phy->identify.device_type, buf);
 587}
 588static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 589
 590static ssize_t do_sas_phy_enable(struct device *dev,
 591		size_t count, int enable)
 592{
 593	struct sas_phy *phy = transport_class_to_phy(dev);
 594	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 595	struct sas_internal *i = to_sas_internal(shost->transportt);
 596	int error;
 597
 598	error = i->f->phy_enable(phy, enable);
 599	if (error)
 600		return error;
 601	phy->enabled = enable;
 602	return count;
 603};
 604
 605static ssize_t
 606store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 607		     const char *buf, size_t count)
 608{
 609	if (count < 1)
 610		return -EINVAL;
 611
 612	switch (buf[0]) {
 613	case '0':
 614		do_sas_phy_enable(dev, count, 0);
 615		break;
 616	case '1':
 617		do_sas_phy_enable(dev, count, 1);
 618		break;
 619	default:
 620		return -EINVAL;
 621	}
 622
 623	return count;
 624}
 625
 626static ssize_t
 627show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 628		    char *buf)
 629{
 630	struct sas_phy *phy = transport_class_to_phy(dev);
 631
 632	return snprintf(buf, 20, "%d", phy->enabled);
 633}
 634
 635static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
 636			 store_sas_phy_enable);
 637
 638static ssize_t
 639do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
 640{
 641	struct sas_phy *phy = transport_class_to_phy(dev);
 642	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 643	struct sas_internal *i = to_sas_internal(shost->transportt);
 644	int error;
 645
 646	error = i->f->phy_reset(phy, hard_reset);
 647	if (error)
 648		return error;
 649	phy->enabled = 1;
 650	return count;
 651};
 652
 653static ssize_t
 654store_sas_link_reset(struct device *dev, struct device_attribute *attr,
 655		     const char *buf, size_t count)
 656{
 657	return do_sas_phy_reset(dev, count, 0);
 658}
 659static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 660
 661static ssize_t
 662store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
 663		     const char *buf, size_t count)
 664{
 665	return do_sas_phy_reset(dev, count, 1);
 666}
 667static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 668
 669sas_phy_protocol_attr(identify.initiator_port_protocols,
 670		initiator_port_protocols);
 671sas_phy_protocol_attr(identify.target_port_protocols,
 672		target_port_protocols);
 673sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 674		unsigned long long);
 675sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 676//sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", int);
 677sas_phy_linkspeed_attr(negotiated_linkrate);
 678sas_phy_linkspeed_attr(minimum_linkrate_hw);
 679sas_phy_linkspeed_rw_attr(minimum_linkrate);
 680sas_phy_linkspeed_attr(maximum_linkrate_hw);
 681sas_phy_linkspeed_rw_attr(maximum_linkrate);
 682sas_phy_linkerror_attr(invalid_dword_count);
 683sas_phy_linkerror_attr(running_disparity_error_count);
 684sas_phy_linkerror_attr(loss_of_dword_sync_count);
 685sas_phy_linkerror_attr(phy_reset_problem_count);
 686
 687static int sas_phy_setup(struct transport_container *tc, struct device *dev,
 688			 struct device *cdev)
 689{
 690	struct sas_phy *phy = dev_to_phy(dev);
 691	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 692	struct sas_internal *i = to_sas_internal(shost->transportt);
 693
 694	if (i->f->phy_setup)
 695		i->f->phy_setup(phy);
 696
 697	return 0;
 698}
 699
 700static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 701		"sas_phy", sas_phy_setup, NULL, NULL);
 702
 703static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 704{
 705	struct Scsi_Host *shost;
 706	struct sas_internal *i;
 707
 708	if (!scsi_is_sas_phy(dev))
 709		return 0;
 710	shost = dev_to_shost(dev->parent);
 711
 712	if (!shost->transportt)
 713		return 0;
 714	if (shost->transportt->host_attrs.ac.class !=
 715			&sas_host_class.class)
 716		return 0;
 717
 718	i = to_sas_internal(shost->transportt);
 719	return &i->phy_attr_cont.ac == cont;
 720}
 721
 722static void sas_phy_release(struct device *dev)
 723{
 724	struct sas_phy *phy = dev_to_phy(dev);
 725	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 726	struct sas_internal *i = to_sas_internal(shost->transportt);
 727
 728	if (i->f->phy_release)
 729		i->f->phy_release(phy);
 730	put_device(dev->parent);
 731	kfree(phy);
 732}
 733
 734/**
 735 * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
 736 * @parent:	Parent device
 737 * @number:	Phy index
 738 *
 739 * Allocates an SAS PHY structure.  It will be added in the device tree
 740 * below the device specified by @parent, which has to be either a Scsi_Host
 741 * or sas_rphy.
 742 *
 743 * Returns:
 744 *	SAS PHY allocated or %NULL if the allocation failed.
 745 */
 746struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 747{
 748	struct Scsi_Host *shost = dev_to_shost(parent);
 749	struct sas_phy *phy;
 750
 751	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
 752	if (!phy)
 753		return NULL;
 754
 755	phy->number = number;
 756	phy->enabled = 1;
 757
 758	device_initialize(&phy->dev);
 759	phy->dev.parent = get_device(parent);
 760	phy->dev.release = sas_phy_release;
 761	INIT_LIST_HEAD(&phy->port_siblings);
 762	if (scsi_is_sas_expander_device(parent)) {
 763		struct sas_rphy *rphy = dev_to_rphy(parent);
 764		dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
 765			rphy->scsi_target_id, number);
 766	} else
 767		dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
 768
 769	transport_setup_device(&phy->dev);
 770
 771	return phy;
 772}
 773EXPORT_SYMBOL(sas_phy_alloc);
 774
 775/**
 776 * sas_phy_add  -  add a SAS PHY to the device hierarchy
 777 * @phy:	The PHY to be added
 778 *
 779 * Publishes a SAS PHY to the rest of the system.
 780 */
 781int sas_phy_add(struct sas_phy *phy)
 782{
 783	int error;
 784
 785	error = device_add(&phy->dev);
 786	if (!error) {
 787		transport_add_device(&phy->dev);
 788		transport_configure_device(&phy->dev);
 789	}
 790
 791	return error;
 792}
 793EXPORT_SYMBOL(sas_phy_add);
 794
 795/**
 796 * sas_phy_free  -  free a SAS PHY
 797 * @phy:	SAS PHY to free
 798 *
 799 * Frees the specified SAS PHY.
 800 *
 801 * Note:
 802 *   This function must only be called on a PHY that has not
 803 *   successfully been added using sas_phy_add().
 804 */
 805void sas_phy_free(struct sas_phy *phy)
 806{
 807	transport_destroy_device(&phy->dev);
 808	put_device(&phy->dev);
 809}
 810EXPORT_SYMBOL(sas_phy_free);
 811
 812/**
 813 * sas_phy_delete  -  remove SAS PHY
 814 * @phy:	SAS PHY to remove
 815 *
 816 * Removes the specified SAS PHY.  If the SAS PHY has an
 817 * associated remote PHY it is removed before.
 818 */
 819void
 820sas_phy_delete(struct sas_phy *phy)
 821{
 822	struct device *dev = &phy->dev;
 823
 824	/* this happens if the phy is still part of a port when deleted */
 825	BUG_ON(!list_empty(&phy->port_siblings));
 826
 827	transport_remove_device(dev);
 828	device_del(dev);
 829	transport_destroy_device(dev);
 830	put_device(dev);
 831}
 832EXPORT_SYMBOL(sas_phy_delete);
 833
 834/**
 835 * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
 836 * @dev:	device to check
 837 *
 838 * Returns:
 839 *	%1 if the device represents a SAS PHY, %0 else
 840 */
 841int scsi_is_sas_phy(const struct device *dev)
 842{
 843	return dev->release == sas_phy_release;
 844}
 845EXPORT_SYMBOL(scsi_is_sas_phy);
 846
 847/*
 848 * SAS Port attributes
 849 */
 850#define sas_port_show_simple(field, name, format_string, cast)		\
 851static ssize_t								\
 852show_sas_port_##name(struct device *dev, 				\
 853		     struct device_attribute *attr, char *buf)		\
 854{									\
 855	struct sas_port *port = transport_class_to_sas_port(dev);	\
 856									\
 857	return snprintf(buf, 20, format_string, cast port->field);	\
 858}
 859
 860#define sas_port_simple_attr(field, name, format_string, type)		\
 861	sas_port_show_simple(field, name, format_string, (type))	\
 862static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
 863
 864sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
 865
 866static DECLARE_TRANSPORT_CLASS(sas_port_class,
 867			       "sas_port", NULL, NULL, NULL);
 868
 869static int sas_port_match(struct attribute_container *cont, struct device *dev)
 870{
 871	struct Scsi_Host *shost;
 872	struct sas_internal *i;
 873
 874	if (!scsi_is_sas_port(dev))
 875		return 0;
 876	shost = dev_to_shost(dev->parent);
 877
 878	if (!shost->transportt)
 879		return 0;
 880	if (shost->transportt->host_attrs.ac.class !=
 881			&sas_host_class.class)
 882		return 0;
 883
 884	i = to_sas_internal(shost->transportt);
 885	return &i->port_attr_cont.ac == cont;
 886}
 887
 888
 889static void sas_port_release(struct device *dev)
 890{
 891	struct sas_port *port = dev_to_sas_port(dev);
 892
 893	BUG_ON(!list_empty(&port->phy_list));
 894
 895	put_device(dev->parent);
 896	kfree(port);
 897}
 898
 899static void sas_port_create_link(struct sas_port *port,
 900				 struct sas_phy *phy)
 901{
 902	int res;
 903
 904	res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
 905				dev_name(&phy->dev));
 906	if (res)
 907		goto err;
 908	res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
 909	if (res)
 910		goto err;
 911	return;
 912err:
 913	printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
 914	       __func__, res);
 915}
 916
 917static void sas_port_delete_link(struct sas_port *port,
 918				 struct sas_phy *phy)
 919{
 920	sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
 921	sysfs_remove_link(&phy->dev.kobj, "port");
 922}
 923
 924/** sas_port_alloc - allocate and initialize a SAS port structure
 925 *
 926 * @parent:	parent device
 927 * @port_id:	port number
 928 *
 929 * Allocates a SAS port structure.  It will be added to the device tree
 930 * below the device specified by @parent which must be either a Scsi_Host
 931 * or a sas_expander_device.
 932 *
 933 * Returns %NULL on error
 934 */
 935struct sas_port *sas_port_alloc(struct device *parent, int port_id)
 936{
 937	struct Scsi_Host *shost = dev_to_shost(parent);
 938	struct sas_port *port;
 939
 940	port = kzalloc(sizeof(*port), GFP_KERNEL);
 941	if (!port)
 942		return NULL;
 943
 944	port->port_identifier = port_id;
 945
 946	device_initialize(&port->dev);
 947
 948	port->dev.parent = get_device(parent);
 949	port->dev.release = sas_port_release;
 950
 951	mutex_init(&port->phy_list_mutex);
 952	INIT_LIST_HEAD(&port->phy_list);
 953
 954	if (scsi_is_sas_expander_device(parent)) {
 955		struct sas_rphy *rphy = dev_to_rphy(parent);
 956		dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
 957			     rphy->scsi_target_id, port->port_identifier);
 958	} else
 959		dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
 960			     port->port_identifier);
 961
 962	transport_setup_device(&port->dev);
 963
 964	return port;
 965}
 966EXPORT_SYMBOL(sas_port_alloc);
 967
 968/** sas_port_alloc_num - allocate and initialize a SAS port structure
 969 *
 970 * @parent:	parent device
 971 *
 972 * Allocates a SAS port structure and a number to go with it.  This
 973 * interface is really for adapters where the port number has no
 974 * meansing, so the sas class should manage them.  It will be added to
 975 * the device tree below the device specified by @parent which must be
 976 * either a Scsi_Host or a sas_expander_device.
 977 *
 978 * Returns %NULL on error
 979 */
 980struct sas_port *sas_port_alloc_num(struct device *parent)
 981{
 982	int index;
 983	struct Scsi_Host *shost = dev_to_shost(parent);
 984	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 985
 986	/* FIXME: use idr for this eventually */
 987	mutex_lock(&sas_host->lock);
 988	if (scsi_is_sas_expander_device(parent)) {
 989		struct sas_rphy *rphy = dev_to_rphy(parent);
 990		struct sas_expander_device *exp = rphy_to_expander_device(rphy);
 991
 992		index = exp->next_port_id++;
 993	} else
 994		index = sas_host->next_port_id++;
 995	mutex_unlock(&sas_host->lock);
 996	return sas_port_alloc(parent, index);
 997}
 998EXPORT_SYMBOL(sas_port_alloc_num);
 999
1000/**
1001 * sas_port_add - add a SAS port to the device hierarchy
1002 * @port:	port to be added
1003 *
1004 * publishes a port to the rest of the system
1005 */
1006int sas_port_add(struct sas_port *port)
1007{
1008	int error;
1009
1010	/* No phys should be added until this is made visible */
1011	BUG_ON(!list_empty(&port->phy_list));
1012
1013	error = device_add(&port->dev);
1014
1015	if (error)
1016		return error;
1017
1018	transport_add_device(&port->dev);
1019	transport_configure_device(&port->dev);
1020
1021	return 0;
1022}
1023EXPORT_SYMBOL(sas_port_add);
1024
1025/**
1026 * sas_port_free  -  free a SAS PORT
1027 * @port:	SAS PORT to free
1028 *
1029 * Frees the specified SAS PORT.
1030 *
1031 * Note:
1032 *   This function must only be called on a PORT that has not
1033 *   successfully been added using sas_port_add().
1034 */
1035void sas_port_free(struct sas_port *port)
1036{
1037	transport_destroy_device(&port->dev);
1038	put_device(&port->dev);
1039}
1040EXPORT_SYMBOL(sas_port_free);
1041
1042/**
1043 * sas_port_delete  -  remove SAS PORT
1044 * @port:	SAS PORT to remove
1045 *
1046 * Removes the specified SAS PORT.  If the SAS PORT has an
1047 * associated phys, unlink them from the port as well.
1048 */
1049void sas_port_delete(struct sas_port *port)
1050{
1051	struct device *dev = &port->dev;
1052	struct sas_phy *phy, *tmp_phy;
1053
1054	if (port->rphy) {
1055		sas_rphy_delete(port->rphy);
1056		port->rphy = NULL;
1057	}
1058
1059	mutex_lock(&port->phy_list_mutex);
1060	list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
1061				 port_siblings) {
1062		sas_port_delete_link(port, phy);
1063		list_del_init(&phy->port_siblings);
1064	}
1065	mutex_unlock(&port->phy_list_mutex);
1066
1067	if (port->is_backlink) {
1068		struct device *parent = port->dev.parent;
1069
1070		sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1071		port->is_backlink = 0;
1072	}
1073
1074	transport_remove_device(dev);
1075	device_del(dev);
1076	transport_destroy_device(dev);
1077	put_device(dev);
1078}
1079EXPORT_SYMBOL(sas_port_delete);
1080
1081/**
1082 * scsi_is_sas_port -  check if a struct device represents a SAS port
1083 * @dev:	device to check
1084 *
1085 * Returns:
1086 *	%1 if the device represents a SAS Port, %0 else
1087 */
1088int scsi_is_sas_port(const struct device *dev)
1089{
1090	return dev->release == sas_port_release;
1091}
1092EXPORT_SYMBOL(scsi_is_sas_port);
1093
1094/**
1095 * sas_port_get_phy - try to take a reference on a port member
1096 * @port: port to check
1097 */
1098struct sas_phy *sas_port_get_phy(struct sas_port *port)
1099{
1100	struct sas_phy *phy;
1101
1102	mutex_lock(&port->phy_list_mutex);
1103	if (list_empty(&port->phy_list))
1104		phy = NULL;
1105	else {
1106		struct list_head *ent = port->phy_list.next;
1107
1108		phy = list_entry(ent, typeof(*phy), port_siblings);
1109		get_device(&phy->dev);
1110	}
1111	mutex_unlock(&port->phy_list_mutex);
1112
1113	return phy;
1114}
1115EXPORT_SYMBOL(sas_port_get_phy);
1116
1117/**
1118 * sas_port_add_phy - add another phy to a port to form a wide port
1119 * @port:	port to add the phy to
1120 * @phy:	phy to add
1121 *
1122 * When a port is initially created, it is empty (has no phys).  All
1123 * ports must have at least one phy to operated, and all wide ports
1124 * must have at least two.  The current code makes no difference
1125 * between ports and wide ports, but the only object that can be
1126 * connected to a remote device is a port, so ports must be formed on
1127 * all devices with phys if they're connected to anything.
1128 */
1129void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1130{
1131	mutex_lock(&port->phy_list_mutex);
1132	if (unlikely(!list_empty(&phy->port_siblings))) {
1133		/* make sure we're already on this port */
1134		struct sas_phy *tmp;
1135
1136		list_for_each_entry(tmp, &port->phy_list, port_siblings)
1137			if (tmp == phy)
1138				break;
1139		/* If this trips, you added a phy that was already
1140		 * part of a different port */
1141		if (unlikely(tmp != phy)) {
1142			dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1143				   dev_name(&phy->dev));
1144			BUG();
1145		}
1146	} else {
1147		sas_port_create_link(port, phy);
1148		list_add_tail(&phy->port_siblings, &port->phy_list);
1149		port->num_phys++;
1150	}
1151	mutex_unlock(&port->phy_list_mutex);
1152}
1153EXPORT_SYMBOL(sas_port_add_phy);
1154
1155/**
1156 * sas_port_delete_phy - remove a phy from a port or wide port
1157 * @port:	port to remove the phy from
1158 * @phy:	phy to remove
1159 *
1160 * This operation is used for tearing down ports again.  It must be
1161 * done to every port or wide port before calling sas_port_delete.
1162 */
1163void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1164{
1165	mutex_lock(&port->phy_list_mutex);
1166	sas_port_delete_link(port, phy);
1167	list_del_init(&phy->port_siblings);
1168	port->num_phys--;
1169	mutex_unlock(&port->phy_list_mutex);
1170}
1171EXPORT_SYMBOL(sas_port_delete_phy);
1172
1173void sas_port_mark_backlink(struct sas_port *port)
1174{
1175	int res;
1176	struct device *parent = port->dev.parent->parent->parent;
1177
1178	if (port->is_backlink)
1179		return;
1180	port->is_backlink = 1;
1181	res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1182				dev_name(parent));
1183	if (res)
1184		goto err;
1185	return;
1186err:
1187	printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1188	       __func__, res);
1189
1190}
1191EXPORT_SYMBOL(sas_port_mark_backlink);
1192
1193/*
1194 * SAS remote PHY attributes.
1195 */
1196
1197#define sas_rphy_show_simple(field, name, format_string, cast)		\
1198static ssize_t								\
1199show_sas_rphy_##name(struct device *dev, 				\
1200		     struct device_attribute *attr, char *buf)		\
1201{									\
1202	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1203									\
1204	return snprintf(buf, 20, format_string, cast rphy->field);	\
1205}
1206
1207#define sas_rphy_simple_attr(field, name, format_string, type)		\
1208	sas_rphy_show_simple(field, name, format_string, (type))	\
1209static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, 			\
1210		show_sas_rphy_##name, NULL)
1211
1212#define sas_rphy_show_protocol(field, name)				\
1213static ssize_t								\
1214show_sas_rphy_##name(struct device *dev, 				\
1215		     struct device_attribute *attr, char *buf)		\
1216{									\
1217	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1218									\
1219	if (!rphy->field)					\
1220		return snprintf(buf, 20, "none\n");			\
1221	return get_sas_protocol_names(rphy->field, buf);	\
1222}
1223
1224#define sas_rphy_protocol_attr(field, name)				\
1225	sas_rphy_show_protocol(field, name)				\
1226static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,			\
1227		show_sas_rphy_##name, NULL)
1228
1229static ssize_t
1230show_sas_rphy_device_type(struct device *dev,
1231			  struct device_attribute *attr, char *buf)
1232{
1233	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1234
1235	if (!rphy->identify.device_type)
1236		return snprintf(buf, 20, "none\n");
1237	return get_sas_device_type_names(
1238			rphy->identify.device_type, buf);
1239}
1240
1241static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1242		show_sas_rphy_device_type, NULL);
1243
1244static ssize_t
1245show_sas_rphy_enclosure_identifier(struct device *dev,
1246				   struct device_attribute *attr, char *buf)
1247{
1248	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1249	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1250	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1251	struct sas_internal *i = to_sas_internal(shost->transportt);
1252	u64 identifier;
1253	int error;
1254
 
 
 
 
 
 
 
1255	error = i->f->get_enclosure_identifier(rphy, &identifier);
1256	if (error)
1257		return error;
1258	return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1259}
1260
1261static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1262		show_sas_rphy_enclosure_identifier, NULL);
1263
1264static ssize_t
1265show_sas_rphy_bay_identifier(struct device *dev,
1266			     struct device_attribute *attr, char *buf)
1267{
1268	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1269	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1270	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1271	struct sas_internal *i = to_sas_internal(shost->transportt);
1272	int val;
1273
 
 
 
1274	val = i->f->get_bay_identifier(rphy);
1275	if (val < 0)
1276		return val;
1277	return sprintf(buf, "%d\n", val);
1278}
1279
1280static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1281		show_sas_rphy_bay_identifier, NULL);
1282
1283sas_rphy_protocol_attr(identify.initiator_port_protocols,
1284		initiator_port_protocols);
1285sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1286sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1287		unsigned long long);
1288sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1289sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
1290
1291/* only need 8 bytes of data plus header (4 or 8) */
1292#define BUF_SIZE 64
1293
1294int sas_read_port_mode_page(struct scsi_device *sdev)
1295{
1296	char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1297	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1298	struct scsi_mode_data mode_data;
1299	int res, error;
1300
1301	if (!buffer)
1302		return -ENOMEM;
1303
1304	res = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
1305			      &mode_data, NULL);
1306
1307	error = -EINVAL;
1308	if (!scsi_status_is_good(res))
1309		goto out;
1310
1311	msdata = buffer +  mode_data.header_length +
1312		mode_data.block_descriptor_length;
1313
1314	if (msdata - buffer > BUF_SIZE - 8)
1315		goto out;
1316
1317	error = 0;
1318
1319	rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1320	rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1321	rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1322
1323 out:
1324	kfree(buffer);
1325	return error;
1326}
1327EXPORT_SYMBOL(sas_read_port_mode_page);
1328
1329static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1330			       "sas_end_device", NULL, NULL, NULL);
1331
1332#define sas_end_dev_show_simple(field, name, format_string, cast)	\
1333static ssize_t								\
1334show_sas_end_dev_##name(struct device *dev, 				\
1335			struct device_attribute *attr, char *buf)	\
1336{									\
1337	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1338	struct sas_end_device *rdev = rphy_to_end_device(rphy);		\
1339									\
1340	return snprintf(buf, 20, format_string, cast rdev->field);	\
1341}
1342
1343#define sas_end_dev_simple_attr(field, name, format_string, type)	\
1344	sas_end_dev_show_simple(field, name, format_string, (type))	\
1345static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO, 			\
1346		show_sas_end_dev_##name, NULL)
1347
1348sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1349sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1350			"%d\n", int);
1351sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1352			"%d\n", int);
1353sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1354			"%d\n", int);
1355sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1356			"%d\n", int);
1357
1358static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1359			       "sas_expander", NULL, NULL, NULL);
1360
1361#define sas_expander_show_simple(field, name, format_string, cast)	\
1362static ssize_t								\
1363show_sas_expander_##name(struct device *dev, 				\
1364			 struct device_attribute *attr, char *buf)	\
1365{									\
1366	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1367	struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1368									\
1369	return snprintf(buf, 20, format_string, cast edev->field);	\
1370}
1371
1372#define sas_expander_simple_attr(field, name, format_string, type)	\
1373	sas_expander_show_simple(field, name, format_string, (type))	\
1374static SAS_DEVICE_ATTR(expander, name, S_IRUGO, 			\
1375		show_sas_expander_##name, NULL)
1376
1377sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1378sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1379sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1380sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1381			 "%s\n", char *);
1382sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1383sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1384			 unsigned int);
1385sas_expander_simple_attr(level, level, "%d\n", int);
1386
1387static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1388		"sas_device", NULL, NULL, NULL);
1389
1390static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1391{
1392	struct Scsi_Host *shost;
1393	struct sas_internal *i;
1394
1395	if (!scsi_is_sas_rphy(dev))
1396		return 0;
1397	shost = dev_to_shost(dev->parent->parent);
1398
1399	if (!shost->transportt)
1400		return 0;
1401	if (shost->transportt->host_attrs.ac.class !=
1402			&sas_host_class.class)
1403		return 0;
1404
1405	i = to_sas_internal(shost->transportt);
1406	return &i->rphy_attr_cont.ac == cont;
1407}
1408
1409static int sas_end_dev_match(struct attribute_container *cont,
1410			     struct device *dev)
1411{
1412	struct Scsi_Host *shost;
1413	struct sas_internal *i;
1414	struct sas_rphy *rphy;
1415
1416	if (!scsi_is_sas_rphy(dev))
1417		return 0;
1418	shost = dev_to_shost(dev->parent->parent);
1419	rphy = dev_to_rphy(dev);
1420
1421	if (!shost->transportt)
1422		return 0;
1423	if (shost->transportt->host_attrs.ac.class !=
1424			&sas_host_class.class)
1425		return 0;
1426
1427	i = to_sas_internal(shost->transportt);
1428	return &i->end_dev_attr_cont.ac == cont &&
1429		rphy->identify.device_type == SAS_END_DEVICE;
1430}
1431
1432static int sas_expander_match(struct attribute_container *cont,
1433			      struct device *dev)
1434{
1435	struct Scsi_Host *shost;
1436	struct sas_internal *i;
1437	struct sas_rphy *rphy;
1438
1439	if (!scsi_is_sas_rphy(dev))
1440		return 0;
1441	shost = dev_to_shost(dev->parent->parent);
1442	rphy = dev_to_rphy(dev);
1443
1444	if (!shost->transportt)
1445		return 0;
1446	if (shost->transportt->host_attrs.ac.class !=
1447			&sas_host_class.class)
1448		return 0;
1449
1450	i = to_sas_internal(shost->transportt);
1451	return &i->expander_attr_cont.ac == cont &&
1452		(rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1453		 rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1454}
1455
1456static void sas_expander_release(struct device *dev)
1457{
1458	struct sas_rphy *rphy = dev_to_rphy(dev);
1459	struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1460
1461	if (rphy->q)
1462		blk_cleanup_queue(rphy->q);
1463
1464	put_device(dev->parent);
1465	kfree(edev);
1466}
1467
1468static void sas_end_device_release(struct device *dev)
1469{
1470	struct sas_rphy *rphy = dev_to_rphy(dev);
1471	struct sas_end_device *edev = rphy_to_end_device(rphy);
1472
1473	if (rphy->q)
1474		blk_cleanup_queue(rphy->q);
1475
1476	put_device(dev->parent);
1477	kfree(edev);
1478}
1479
1480/**
1481 * sas_rphy_initialize - common rphy intialization
1482 * @rphy:	rphy to initialise
1483 *
1484 * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1485 * initialise the common rphy component of each.
1486 */
1487static void sas_rphy_initialize(struct sas_rphy *rphy)
1488{
1489	INIT_LIST_HEAD(&rphy->list);
1490}
1491
1492/**
1493 * sas_end_device_alloc - allocate an rphy for an end device
1494 * @parent: which port
1495 *
1496 * Allocates an SAS remote PHY structure, connected to @parent.
1497 *
1498 * Returns:
1499 *	SAS PHY allocated or %NULL if the allocation failed.
1500 */
1501struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1502{
1503	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1504	struct sas_end_device *rdev;
1505
1506	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1507	if (!rdev) {
1508		return NULL;
1509	}
1510
1511	device_initialize(&rdev->rphy.dev);
1512	rdev->rphy.dev.parent = get_device(&parent->dev);
1513	rdev->rphy.dev.release = sas_end_device_release;
1514	if (scsi_is_sas_expander_device(parent->dev.parent)) {
1515		struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1516		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1517			     shost->host_no, rphy->scsi_target_id,
1518			     parent->port_identifier);
1519	} else
1520		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1521			     shost->host_no, parent->port_identifier);
1522	rdev->rphy.identify.device_type = SAS_END_DEVICE;
1523	sas_rphy_initialize(&rdev->rphy);
1524	transport_setup_device(&rdev->rphy.dev);
1525
1526	return &rdev->rphy;
1527}
1528EXPORT_SYMBOL(sas_end_device_alloc);
1529
1530/**
1531 * sas_expander_alloc - allocate an rphy for an end device
1532 * @parent: which port
1533 * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1534 *
1535 * Allocates an SAS remote PHY structure, connected to @parent.
1536 *
1537 * Returns:
1538 *	SAS PHY allocated or %NULL if the allocation failed.
1539 */
1540struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1541				    enum sas_device_type type)
1542{
1543	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1544	struct sas_expander_device *rdev;
1545	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1546
1547	BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1548	       type != SAS_FANOUT_EXPANDER_DEVICE);
1549
1550	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1551	if (!rdev) {
1552		return NULL;
1553	}
1554
1555	device_initialize(&rdev->rphy.dev);
1556	rdev->rphy.dev.parent = get_device(&parent->dev);
1557	rdev->rphy.dev.release = sas_expander_release;
1558	mutex_lock(&sas_host->lock);
1559	rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1560	mutex_unlock(&sas_host->lock);
1561	dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1562		     shost->host_no, rdev->rphy.scsi_target_id);
1563	rdev->rphy.identify.device_type = type;
1564	sas_rphy_initialize(&rdev->rphy);
1565	transport_setup_device(&rdev->rphy.dev);
1566
1567	return &rdev->rphy;
1568}
1569EXPORT_SYMBOL(sas_expander_alloc);
1570
1571/**
1572 * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
1573 * @rphy:	The remote PHY to be added
1574 *
1575 * Publishes a SAS remote PHY to the rest of the system.
1576 */
1577int sas_rphy_add(struct sas_rphy *rphy)
1578{
1579	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1580	struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1581	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1582	struct sas_identify *identify = &rphy->identify;
1583	int error;
1584
1585	if (parent->rphy)
1586		return -ENXIO;
1587	parent->rphy = rphy;
1588
1589	error = device_add(&rphy->dev);
1590	if (error)
1591		return error;
1592	transport_add_device(&rphy->dev);
1593	transport_configure_device(&rphy->dev);
1594	if (sas_bsg_initialize(shost, rphy))
1595		printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1596
1597
1598	mutex_lock(&sas_host->lock);
1599	list_add_tail(&rphy->list, &sas_host->rphy_list);
1600	if (identify->device_type == SAS_END_DEVICE &&
1601	    (identify->target_port_protocols &
1602	     (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
1603		rphy->scsi_target_id = sas_host->next_target_id++;
1604	else if (identify->device_type == SAS_END_DEVICE)
1605		rphy->scsi_target_id = -1;
1606	mutex_unlock(&sas_host->lock);
1607
1608	if (identify->device_type == SAS_END_DEVICE &&
1609	    rphy->scsi_target_id != -1) {
1610		int lun;
1611
1612		if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1613			lun = SCAN_WILD_CARD;
1614		else
1615			lun = 0;
1616
1617		scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun, 0);
1618	}
1619
1620	return 0;
1621}
1622EXPORT_SYMBOL(sas_rphy_add);
1623
1624/**
1625 * sas_rphy_free  -  free a SAS remote PHY
1626 * @rphy: SAS remote PHY to free
1627 *
1628 * Frees the specified SAS remote PHY.
1629 *
1630 * Note:
1631 *   This function must only be called on a remote
1632 *   PHY that has not successfully been added using
1633 *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1634 */
1635void sas_rphy_free(struct sas_rphy *rphy)
1636{
1637	struct device *dev = &rphy->dev;
1638	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1639	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1640
1641	mutex_lock(&sas_host->lock);
1642	list_del(&rphy->list);
1643	mutex_unlock(&sas_host->lock);
1644
1645	transport_destroy_device(dev);
1646
1647	put_device(dev);
1648}
1649EXPORT_SYMBOL(sas_rphy_free);
1650
1651/**
1652 * sas_rphy_delete  -  remove and free SAS remote PHY
1653 * @rphy:	SAS remote PHY to remove and free
1654 *
1655 * Removes the specified SAS remote PHY and frees it.
1656 */
1657void
1658sas_rphy_delete(struct sas_rphy *rphy)
1659{
1660	sas_rphy_remove(rphy);
1661	sas_rphy_free(rphy);
1662}
1663EXPORT_SYMBOL(sas_rphy_delete);
1664
1665/**
1666 * sas_rphy_unlink  -  unlink SAS remote PHY
1667 * @rphy:	SAS remote phy to unlink from its parent port
1668 *
1669 * Removes port reference to an rphy
1670 */
1671void sas_rphy_unlink(struct sas_rphy *rphy)
1672{
1673	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1674
1675	parent->rphy = NULL;
1676}
1677EXPORT_SYMBOL(sas_rphy_unlink);
1678
1679/**
1680 * sas_rphy_remove  -  remove SAS remote PHY
1681 * @rphy:	SAS remote phy to remove
1682 *
1683 * Removes the specified SAS remote PHY.
1684 */
1685void
1686sas_rphy_remove(struct sas_rphy *rphy)
1687{
1688	struct device *dev = &rphy->dev;
1689
1690	switch (rphy->identify.device_type) {
1691	case SAS_END_DEVICE:
1692		scsi_remove_target(dev);
1693		break;
1694	case SAS_EDGE_EXPANDER_DEVICE:
1695	case SAS_FANOUT_EXPANDER_DEVICE:
1696		sas_remove_children(dev);
1697		break;
1698	default:
1699		break;
1700	}
1701
1702	sas_rphy_unlink(rphy);
1703	sas_bsg_remove(NULL, rphy);
1704	transport_remove_device(dev);
1705	device_del(dev);
1706}
1707EXPORT_SYMBOL(sas_rphy_remove);
1708
1709/**
1710 * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
1711 * @dev:	device to check
1712 *
1713 * Returns:
1714 *	%1 if the device represents a SAS remote PHY, %0 else
1715 */
1716int scsi_is_sas_rphy(const struct device *dev)
1717{
1718	return dev->release == sas_end_device_release ||
1719		dev->release == sas_expander_release;
1720}
1721EXPORT_SYMBOL(scsi_is_sas_rphy);
1722
1723
1724/*
1725 * SCSI scan helper
1726 */
1727
1728static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1729		uint id, u64 lun)
1730{
1731	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1732	struct sas_rphy *rphy;
1733
1734	mutex_lock(&sas_host->lock);
1735	list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1736		if (rphy->identify.device_type != SAS_END_DEVICE ||
1737		    rphy->scsi_target_id == -1)
1738			continue;
1739
1740		if ((channel == SCAN_WILD_CARD || channel == 0) &&
1741		    (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1742			scsi_scan_target(&rphy->dev, 0,
1743					 rphy->scsi_target_id, lun, 1);
1744		}
1745	}
1746	mutex_unlock(&sas_host->lock);
1747
1748	return 0;
1749}
1750
1751
1752/*
1753 * Setup / Teardown code
1754 */
1755
1756#define SETUP_TEMPLATE(attrb, field, perm, test)			\
1757	i->private_##attrb[count] = dev_attr_##field;		\
1758	i->private_##attrb[count].attr.mode = perm;			\
1759	i->attrb[count] = &i->private_##attrb[count];			\
1760	if (test)							\
1761		count++
1762
1763#define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)	\
1764	i->private_##attrb[count] = dev_attr_##field;		\
1765	i->private_##attrb[count].attr.mode = perm;			\
1766	if (ro_test) {							\
1767		i->private_##attrb[count].attr.mode = ro_perm;		\
1768		i->private_##attrb[count].store = NULL;			\
1769	}								\
1770	i->attrb[count] = &i->private_##attrb[count];			\
1771	if (test)							\
1772		count++
1773
1774#define SETUP_RPORT_ATTRIBUTE(field) 					\
1775	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1776
1777#define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)			\
1778	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1779
1780#define SETUP_PHY_ATTRIBUTE(field)					\
1781	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1782
1783#define SETUP_PHY_ATTRIBUTE_RW(field)					\
1784	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
1785			!i->f->set_phy_speed, S_IRUGO)
1786
1787#define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)			\
1788	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
1789			  !i->f->func, S_IRUGO)
1790
1791#define SETUP_PORT_ATTRIBUTE(field)					\
1792	SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1793
1794#define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)			\
1795	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1796
1797#define SETUP_PHY_ATTRIBUTE_WRONLY(field)				\
1798	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1799
1800#define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)		\
1801	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1802
1803#define SETUP_END_DEV_ATTRIBUTE(field)					\
1804	SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1805
1806#define SETUP_EXPANDER_ATTRIBUTE(field)					\
1807	SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1808
1809/**
1810 * sas_attach_transport  -  instantiate SAS transport template
1811 * @ft:		SAS transport class function template
1812 */
1813struct scsi_transport_template *
1814sas_attach_transport(struct sas_function_template *ft)
1815{
1816	struct sas_internal *i;
1817	int count;
1818
1819	i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1820	if (!i)
1821		return NULL;
1822
1823	i->t.user_scan = sas_user_scan;
1824
1825	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1826	i->t.host_attrs.ac.class = &sas_host_class.class;
1827	i->t.host_attrs.ac.match = sas_host_match;
1828	transport_container_register(&i->t.host_attrs);
1829	i->t.host_size = sizeof(struct sas_host_attrs);
1830
1831	i->phy_attr_cont.ac.class = &sas_phy_class.class;
1832	i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1833	i->phy_attr_cont.ac.match = sas_phy_match;
1834	transport_container_register(&i->phy_attr_cont);
1835
1836	i->port_attr_cont.ac.class = &sas_port_class.class;
1837	i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1838	i->port_attr_cont.ac.match = sas_port_match;
1839	transport_container_register(&i->port_attr_cont);
1840
1841	i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1842	i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1843	i->rphy_attr_cont.ac.match = sas_rphy_match;
1844	transport_container_register(&i->rphy_attr_cont);
1845
1846	i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1847	i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1848	i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1849	transport_container_register(&i->end_dev_attr_cont);
1850
1851	i->expander_attr_cont.ac.class = &sas_expander_class.class;
1852	i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1853	i->expander_attr_cont.ac.match = sas_expander_match;
1854	transport_container_register(&i->expander_attr_cont);
1855
1856	i->f = ft;
1857
1858	count = 0;
1859	SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1860	SETUP_PHY_ATTRIBUTE(target_port_protocols);
1861	SETUP_PHY_ATTRIBUTE(device_type);
1862	SETUP_PHY_ATTRIBUTE(sas_address);
1863	SETUP_PHY_ATTRIBUTE(phy_identifier);
1864	//SETUP_PHY_ATTRIBUTE(port_identifier);
1865	SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1866	SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1867	SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1868	SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1869	SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1870
1871	SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1872	SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1873	SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1874	SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1875	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1876	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1877	SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1878	i->phy_attrs[count] = NULL;
1879
1880	count = 0;
1881	SETUP_PORT_ATTRIBUTE(num_phys);
1882	i->port_attrs[count] = NULL;
1883
1884	count = 0;
1885	SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1886	SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1887	SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1888	SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1889	SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1890	SETUP_RPORT_ATTRIBUTE(rphy_scsi_target_id);
1891	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1892				       get_enclosure_identifier);
1893	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1894				       get_bay_identifier);
1895	i->rphy_attrs[count] = NULL;
1896
1897	count = 0;
1898	SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1899	SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1900	SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1901	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1902	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1903	i->end_dev_attrs[count] = NULL;
1904
1905	count = 0;
1906	SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1907	SETUP_EXPANDER_ATTRIBUTE(product_id);
1908	SETUP_EXPANDER_ATTRIBUTE(product_rev);
1909	SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1910	SETUP_EXPANDER_ATTRIBUTE(component_id);
1911	SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1912	SETUP_EXPANDER_ATTRIBUTE(level);
1913	i->expander_attrs[count] = NULL;
1914
1915	return &i->t;
1916}
1917EXPORT_SYMBOL(sas_attach_transport);
1918
1919/**
1920 * sas_release_transport  -  release SAS transport template instance
1921 * @t:		transport template instance
1922 */
1923void sas_release_transport(struct scsi_transport_template *t)
1924{
1925	struct sas_internal *i = to_sas_internal(t);
1926
1927	transport_container_unregister(&i->t.host_attrs);
1928	transport_container_unregister(&i->phy_attr_cont);
1929	transport_container_unregister(&i->port_attr_cont);
1930	transport_container_unregister(&i->rphy_attr_cont);
1931	transport_container_unregister(&i->end_dev_attr_cont);
1932	transport_container_unregister(&i->expander_attr_cont);
1933
1934	kfree(i);
1935}
1936EXPORT_SYMBOL(sas_release_transport);
1937
1938static __init int sas_transport_init(void)
1939{
1940	int error;
1941
1942	error = transport_class_register(&sas_host_class);
1943	if (error)
1944		goto out;
1945	error = transport_class_register(&sas_phy_class);
1946	if (error)
1947		goto out_unregister_transport;
1948	error = transport_class_register(&sas_port_class);
1949	if (error)
1950		goto out_unregister_phy;
1951	error = transport_class_register(&sas_rphy_class);
1952	if (error)
1953		goto out_unregister_port;
1954	error = transport_class_register(&sas_end_dev_class);
1955	if (error)
1956		goto out_unregister_rphy;
1957	error = transport_class_register(&sas_expander_class);
1958	if (error)
1959		goto out_unregister_end_dev;
1960
1961	return 0;
1962
1963 out_unregister_end_dev:
1964	transport_class_unregister(&sas_end_dev_class);
1965 out_unregister_rphy:
1966	transport_class_unregister(&sas_rphy_class);
1967 out_unregister_port:
1968	transport_class_unregister(&sas_port_class);
1969 out_unregister_phy:
1970	transport_class_unregister(&sas_phy_class);
1971 out_unregister_transport:
1972	transport_class_unregister(&sas_host_class);
1973 out:
1974	return error;
1975
1976}
1977
1978static void __exit sas_transport_exit(void)
1979{
1980	transport_class_unregister(&sas_host_class);
1981	transport_class_unregister(&sas_phy_class);
1982	transport_class_unregister(&sas_port_class);
1983	transport_class_unregister(&sas_rphy_class);
1984	transport_class_unregister(&sas_end_dev_class);
1985	transport_class_unregister(&sas_expander_class);
1986}
1987
1988MODULE_AUTHOR("Christoph Hellwig");
1989MODULE_DESCRIPTION("SAS Transport Attributes");
1990MODULE_LICENSE("GPL");
1991
1992module_init(sas_transport_init);
1993module_exit(sas_transport_exit);