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/drivers/scsi/scsi_transport_sas.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 1913 lines | 1331 code | 294 blank | 288 comment | 140 complexity | 29fabc3d7e0376f7f13d90769b6c77d1 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0

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

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