1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * scsi_sysfs.c
   4 *
   5 * SCSI sysfs interface routines.
   6 *
   7 * Created to pull SCSI mid layer sysfs routines into one file.
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/slab.h>
  12#include <linux/init.h>
  13#include <linux/blkdev.h>
  14#include <linux/device.h>
  15#include <linux/pm_runtime.h>
  16#include <linux/bsg.h>
  17
  18#include <scsi/scsi.h>
  19#include <scsi/scsi_device.h>
  20#include <scsi/scsi_host.h>
  21#include <scsi/scsi_tcq.h>
  22#include <scsi/scsi_dh.h>
  23#include <scsi/scsi_transport.h>
  24#include <scsi/scsi_driver.h>
  25#include <scsi/scsi_devinfo.h>
  26
  27#include "scsi_priv.h"
  28#include "scsi_logging.h"
  29
  30static struct device_type scsi_dev_type;
  31
  32static const struct {
  33	enum scsi_device_state	value;
  34	char			*name;
  35} sdev_states[] = {
  36	{ SDEV_CREATED, "created" },
  37	{ SDEV_RUNNING, "running" },
  38	{ SDEV_CANCEL, "cancel" },
  39	{ SDEV_DEL, "deleted" },
  40	{ SDEV_QUIESCE, "quiesce" },
  41	{ SDEV_OFFLINE,	"offline" },
  42	{ SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  43	{ SDEV_BLOCK,	"blocked" },
  44	{ SDEV_CREATED_BLOCK, "created-blocked" },
  45};
  46
  47const char *scsi_device_state_name(enum scsi_device_state state)
  48{
  49	int i;
  50	char *name = NULL;
  51
  52	for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  53		if (sdev_states[i].value == state) {
  54			name = sdev_states[i].name;
  55			break;
  56		}
  57	}
  58	return name;
  59}
  60
  61static const struct {
  62	enum scsi_host_state	value;
  63	char			*name;
  64} shost_states[] = {
  65	{ SHOST_CREATED, "created" },
  66	{ SHOST_RUNNING, "running" },
  67	{ SHOST_CANCEL, "cancel" },
  68	{ SHOST_DEL, "deleted" },
  69	{ SHOST_RECOVERY, "recovery" },
  70	{ SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  71	{ SHOST_DEL_RECOVERY, "deleted/recovery", },
  72};
  73const char *scsi_host_state_name(enum scsi_host_state state)
  74{
  75	int i;
  76	char *name = NULL;
  77
  78	for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  79		if (shost_states[i].value == state) {
  80			name = shost_states[i].name;
  81			break;
  82		}
  83	}
  84	return name;
  85}
  86
  87#ifdef CONFIG_SCSI_DH
  88static const struct {
  89	unsigned char	value;
  90	char		*name;
  91} sdev_access_states[] = {
  92	{ SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
  93	{ SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
  94	{ SCSI_ACCESS_STATE_STANDBY, "standby" },
  95	{ SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
  96	{ SCSI_ACCESS_STATE_LBA, "lba-dependent" },
  97	{ SCSI_ACCESS_STATE_OFFLINE, "offline" },
  98	{ SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
  99};
 100
 101static const char *scsi_access_state_name(unsigned char state)
 102{
 103	int i;
 104	char *name = NULL;
 105
 106	for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
 107		if (sdev_access_states[i].value == state) {
 108			name = sdev_access_states[i].name;
 109			break;
 110		}
 111	}
 112	return name;
 113}
 114#endif
 115
 116static int check_set(unsigned long long *val, char *src)
 117{
 118	char *last;
 119
 120	if (strcmp(src, "-") == 0) {
 121		*val = SCAN_WILD_CARD;
 122	} else {
 123		/*
 124		 * Doesn't check for int overflow
 125		 */
 126		*val = simple_strtoull(src, &last, 0);
 127		if (*last != '\0')
 128			return 1;
 129	}
 130	return 0;
 131}
 132
 133static int scsi_scan(struct Scsi_Host *shost, const char *str)
 134{
 135	char s1[15], s2[15], s3[17], junk;
 136	unsigned long long channel, id, lun;
 137	int res;
 138
 139	res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
 140	if (res != 3)
 141		return -EINVAL;
 142	if (check_set(&channel, s1))
 143		return -EINVAL;
 144	if (check_set(&id, s2))
 145		return -EINVAL;
 146	if (check_set(&lun, s3))
 147		return -EINVAL;
 148	if (shost->transportt->user_scan)
 149		res = shost->transportt->user_scan(shost, channel, id, lun);
 150	else
 151		res = scsi_scan_host_selected(shost, channel, id, lun,
 152					      SCSI_SCAN_MANUAL);
 153	return res;
 154}
 155
 156/*
 157 * shost_show_function: macro to create an attr function that can be used to
 158 * show a non-bit field.
 159 */
 160#define shost_show_function(name, field, format_string)			\
 161static ssize_t								\
 162show_##name (struct device *dev, struct device_attribute *attr, 	\
 163	     char *buf)							\
 164{									\
 165	struct Scsi_Host *shost = class_to_shost(dev);			\
 166	return snprintf (buf, 20, format_string, shost->field);		\
 167}
 168
 169/*
 170 * shost_rd_attr: macro to create a function and attribute variable for a
 171 * read only field.
 172 */
 173#define shost_rd_attr2(name, field, format_string)			\
 174	shost_show_function(name, field, format_string)			\
 175static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 176
 177#define shost_rd_attr(field, format_string) \
 178shost_rd_attr2(field, field, format_string)
 179
 180/*
 181 * Create the actual show/store functions and data structures.
 182 */
 183
 184static ssize_t
 185store_scan(struct device *dev, struct device_attribute *attr,
 186	   const char *buf, size_t count)
 187{
 188	struct Scsi_Host *shost = class_to_shost(dev);
 189	int res;
 190
 191	res = scsi_scan(shost, buf);
 192	if (res == 0)
 193		res = count;
 194	return res;
 195};
 196static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 197
 198static ssize_t
 199store_shost_state(struct device *dev, struct device_attribute *attr,
 200		  const char *buf, size_t count)
 201{
 202	int i;
 203	struct Scsi_Host *shost = class_to_shost(dev);
 204	enum scsi_host_state state = 0;
 205
 206	for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 207		const int len = strlen(shost_states[i].name);
 208		if (strncmp(shost_states[i].name, buf, len) == 0 &&
 209		   buf[len] == '\n') {
 210			state = shost_states[i].value;
 211			break;
 212		}
 213	}
 214	if (!state)
 215		return -EINVAL;
 216
 217	if (scsi_host_set_state(shost, state))
 218		return -EINVAL;
 219	return count;
 220}
 221
 222static ssize_t
 223show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 224{
 225	struct Scsi_Host *shost = class_to_shost(dev);
 226	const char *name = scsi_host_state_name(shost->shost_state);
 227
 228	if (!name)
 229		return -EINVAL;
 230
 231	return snprintf(buf, 20, "%s\n", name);
 232}
 233
 234/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 235static struct device_attribute dev_attr_hstate =
 236	__ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 237
 238static ssize_t
 239show_shost_mode(unsigned int mode, char *buf)
 240{
 241	ssize_t len = 0;
 242
 243	if (mode & MODE_INITIATOR)
 244		len = sprintf(buf, "%s", "Initiator");
 245
 246	if (mode & MODE_TARGET)
 247		len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 248
 249	len += sprintf(buf + len, "\n");
 250
 251	return len;
 252}
 253
 254static ssize_t
 255show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 256			  char *buf)
 257{
 258	struct Scsi_Host *shost = class_to_shost(dev);
 259	unsigned int supported_mode = shost->hostt->supported_mode;
 260
 261	if (supported_mode == MODE_UNKNOWN)
 262		/* by default this should be initiator */
 263		supported_mode = MODE_INITIATOR;
 264
 265	return show_shost_mode(supported_mode, buf);
 266}
 267
 268static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 269
 270static ssize_t
 271show_shost_active_mode(struct device *dev,
 272		       struct device_attribute *attr, char *buf)
 273{
 274	struct Scsi_Host *shost = class_to_shost(dev);
 275
 276	if (shost->active_mode == MODE_UNKNOWN)
 277		return snprintf(buf, 20, "unknown\n");
 278	else
 279		return show_shost_mode(shost->active_mode, buf);
 280}
 281
 282static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 283
 284static int check_reset_type(const char *str)
 285{
 286	if (sysfs_streq(str, "adapter"))
 287		return SCSI_ADAPTER_RESET;
 288	else if (sysfs_streq(str, "firmware"))
 289		return SCSI_FIRMWARE_RESET;
 290	else
 291		return 0;
 292}
 293
 294static ssize_t
 295store_host_reset(struct device *dev, struct device_attribute *attr,
 296		const char *buf, size_t count)
 297{
 298	struct Scsi_Host *shost = class_to_shost(dev);
 299	const struct scsi_host_template *sht = shost->hostt;
 300	int ret = -EINVAL;
 301	int type;
 302
 303	type = check_reset_type(buf);
 304	if (!type)
 305		goto exit_store_host_reset;
 306
 307	if (sht->host_reset)
 308		ret = sht->host_reset(shost, type);
 309	else
 310		ret = -EOPNOTSUPP;
 311
 312exit_store_host_reset:
 313	if (ret == 0)
 314		ret = count;
 315	return ret;
 316}
 317
 318static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 319
 320static ssize_t
 321show_shost_eh_deadline(struct device *dev,
 322		      struct device_attribute *attr, char *buf)
 323{
 324	struct Scsi_Host *shost = class_to_shost(dev);
 325
 326	if (shost->eh_deadline == -1)
 327		return snprintf(buf, strlen("off") + 2, "off\n");
 328	return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 329}
 330
 331static ssize_t
 332store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 333		const char *buf, size_t count)
 334{
 335	struct Scsi_Host *shost = class_to_shost(dev);
 336	int ret = -EINVAL;
 337	unsigned long deadline, flags;
 338
 339	if (shost->transportt &&
 340	    (shost->transportt->eh_strategy_handler ||
 341	     !shost->hostt->eh_host_reset_handler))
 342		return ret;
 343
 344	if (!strncmp(buf, "off", strlen("off")))
 345		deadline = -1;
 346	else {
 347		ret = kstrtoul(buf, 10, &deadline);
 348		if (ret)
 349			return ret;
 350		if (deadline * HZ > UINT_MAX)
 351			return -EINVAL;
 352	}
 353
 354	spin_lock_irqsave(shost->host_lock, flags);
 355	if (scsi_host_in_recovery(shost))
 356		ret = -EBUSY;
 357	else {
 358		if (deadline == -1)
 359			shost->eh_deadline = -1;
 360		else
 361			shost->eh_deadline = deadline * HZ;
 362
 363		ret = count;
 364	}
 365	spin_unlock_irqrestore(shost->host_lock, flags);
 366
 367	return ret;
 368}
 369
 370static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 371
 372shost_rd_attr(unique_id, "%u\n");
 373shost_rd_attr(cmd_per_lun, "%hd\n");
 374shost_rd_attr(can_queue, "%d\n");
 375shost_rd_attr(sg_tablesize, "%hu\n");
 376shost_rd_attr(sg_prot_tablesize, "%hu\n");
 377shost_rd_attr(prot_capabilities, "%u\n");
 378shost_rd_attr(prot_guard_type, "%hd\n");
 379shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 380
 381static ssize_t
 382show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
 383{
 384	struct Scsi_Host *shost = class_to_shost(dev);
 385	return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
 386}
 387static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 388
 389static ssize_t
 390show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
 391{
 392	return sprintf(buf, "1\n");
 393}
 394static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
 395
 396static ssize_t
 397show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf)
 398{
 399	struct Scsi_Host *shost = class_to_shost(dev);
 400	struct blk_mq_tag_set *tag_set = &shost->tag_set;
 401
 402	return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues);
 403}
 404static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
 405
 406static struct attribute *scsi_sysfs_shost_attrs[] = {
 407	&dev_attr_use_blk_mq.attr,
 408	&dev_attr_unique_id.attr,
 409	&dev_attr_host_busy.attr,
 410	&dev_attr_cmd_per_lun.attr,
 411	&dev_attr_can_queue.attr,
 412	&dev_attr_sg_tablesize.attr,
 413	&dev_attr_sg_prot_tablesize.attr,
 414	&dev_attr_proc_name.attr,
 415	&dev_attr_scan.attr,
 416	&dev_attr_hstate.attr,
 417	&dev_attr_supported_mode.attr,
 418	&dev_attr_active_mode.attr,
 419	&dev_attr_prot_capabilities.attr,
 420	&dev_attr_prot_guard_type.attr,
 421	&dev_attr_host_reset.attr,
 422	&dev_attr_eh_deadline.attr,
 423	&dev_attr_nr_hw_queues.attr,
 424	NULL
 425};
 426
 427static const struct attribute_group scsi_shost_attr_group = {
 428	.attrs =	scsi_sysfs_shost_attrs,
 429};
 430
 431const struct attribute_group *scsi_shost_groups[] = {
 432	&scsi_shost_attr_group,
 433	NULL
 434};
 435
 436static void scsi_device_cls_release(struct device *class_dev)
 437{
 438	struct scsi_device *sdev;
 439
 440	sdev = class_to_sdev(class_dev);
 441	put_device(&sdev->sdev_gendev);
 442}
 443
 444static void scsi_device_dev_release(struct device *dev)
 445{
 446	struct scsi_device *sdev = to_scsi_device(dev);
 447	struct device *parent;
 448	struct list_head *this, *tmp;
 449	struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 450	struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
 451	struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL;
 452	unsigned long flags;
 453
 454	might_sleep();
 455
 456	scsi_dh_release_device(sdev);
 457
 458	parent = sdev->sdev_gendev.parent;
 459
 460	spin_lock_irqsave(sdev->host->host_lock, flags);
 461	list_del(&sdev->siblings);
 462	list_del(&sdev->same_target_siblings);
 463	list_del(&sdev->starved_entry);
 464	spin_unlock_irqrestore(sdev->host->host_lock, flags);
 465
 466	cancel_work_sync(&sdev->event_work);
 467
 468	list_for_each_safe(this, tmp, &sdev->event_list) {
 469		struct scsi_event *evt;
 470
 471		evt = list_entry(this, struct scsi_event, node);
 472		list_del(&evt->node);
 473		kfree(evt);
 474	}
 475
 476	blk_put_queue(sdev->request_queue);
 477	/* NULL queue means the device can't be used */
 478	sdev->request_queue = NULL;
 479
 480	sbitmap_free(&sdev->budget_map);
 481
 482	mutex_lock(&sdev->inquiry_mutex);
 483	vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 484				       lockdep_is_held(&sdev->inquiry_mutex));
 485	vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 486				       lockdep_is_held(&sdev->inquiry_mutex));
 487	vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 488				       lockdep_is_held(&sdev->inquiry_mutex));
 489	vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 490				       lockdep_is_held(&sdev->inquiry_mutex));
 491	vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
 492				       lockdep_is_held(&sdev->inquiry_mutex));
 493	vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
 494				       lockdep_is_held(&sdev->inquiry_mutex));
 495	vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
 496				       lockdep_is_held(&sdev->inquiry_mutex));
 497	mutex_unlock(&sdev->inquiry_mutex);
 498
 499	if (vpd_pg0)
 500		kfree_rcu(vpd_pg0, rcu);
 501	if (vpd_pg83)
 502		kfree_rcu(vpd_pg83, rcu);
 503	if (vpd_pg80)
 504		kfree_rcu(vpd_pg80, rcu);
 505	if (vpd_pg89)
 506		kfree_rcu(vpd_pg89, rcu);
 507	if (vpd_pgb0)
 508		kfree_rcu(vpd_pgb0, rcu);
 509	if (vpd_pgb1)
 510		kfree_rcu(vpd_pgb1, rcu);
 511	if (vpd_pgb2)
 512		kfree_rcu(vpd_pgb2, rcu);
 513	kfree(sdev->inquiry);
 514	kfree(sdev);
 515
 516	if (parent)
 517		put_device(parent);
 518}
 519
 520static struct class sdev_class = {
 521	.name		= "scsi_device",
 522	.dev_release	= scsi_device_cls_release,
 523};
 524
 525/* all probing is done in the individual ->probe routines */
 526static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 527{
 528	struct scsi_device *sdp;
 529
 530	if (dev->type != &scsi_dev_type)
 531		return 0;
 532
 533	sdp = to_scsi_device(dev);
 534	if (sdp->no_uld_attach)
 535		return 0;
 536	return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 537}
 538
 539static int scsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 540{
 541	const struct scsi_device *sdev;
 542
 543	if (dev->type != &scsi_dev_type)
 544		return 0;
 545
 546	sdev = to_scsi_device(dev);
 547
 548	add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 549	return 0;
 550}
 551
 552struct bus_type scsi_bus_type = {
 553        .name		= "scsi",
 554        .match		= scsi_bus_match,
 555	.uevent		= scsi_bus_uevent,
 556#ifdef CONFIG_PM
 557	.pm		= &scsi_bus_pm_ops,
 558#endif
 559};
 560
 561int scsi_sysfs_register(void)
 562{
 563	int error;
 564
 565	error = bus_register(&scsi_bus_type);
 566	if (!error) {
 567		error = class_register(&sdev_class);
 568		if (error)
 569			bus_unregister(&scsi_bus_type);
 570	}
 571
 572	return error;
 573}
 574
 575void scsi_sysfs_unregister(void)
 576{
 577	class_unregister(&sdev_class);
 578	bus_unregister(&scsi_bus_type);
 579}
 580
 581/*
 582 * sdev_show_function: macro to create an attr function that can be used to
 583 * show a non-bit field.
 584 */
 585#define sdev_show_function(field, format_string)				\
 586static ssize_t								\
 587sdev_show_##field (struct device *dev, struct device_attribute *attr,	\
 588		   char *buf)						\
 589{									\
 590	struct scsi_device *sdev;					\
 591	sdev = to_scsi_device(dev);					\
 592	return snprintf (buf, 20, format_string, sdev->field);		\
 593}									\
 594
 595/*
 596 * sdev_rd_attr: macro to create a function and attribute variable for a
 597 * read only field.
 598 */
 599#define sdev_rd_attr(field, format_string)				\
 600	sdev_show_function(field, format_string)			\
 601static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 602
 603
 604/*
 605 * sdev_rw_attr: create a function and attribute variable for a
 606 * read/write field.
 607 */
 608#define sdev_rw_attr(field, format_string)				\
 609	sdev_show_function(field, format_string)				\
 610									\
 611static ssize_t								\
 612sdev_store_##field (struct device *dev, struct device_attribute *attr,	\
 613		    const char *buf, size_t count)			\
 614{									\
 615	struct scsi_device *sdev;					\
 616	sdev = to_scsi_device(dev);					\
 617	sscanf (buf, format_string, &sdev->field);			\
 618	return count;							\
 619}									\
 620static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 621
 622/* Currently we don't export bit fields, but we might in future,
 623 * so leave this code in */
 624#if 0
 625/*
 626 * sdev_rd_attr: create a function and attribute variable for a
 627 * read/write bit field.
 628 */
 629#define sdev_rw_attr_bit(field)						\
 630	sdev_show_function(field, "%d\n")					\
 631									\
 632static ssize_t								\
 633sdev_store_##field (struct device *dev, struct device_attribute *attr,	\
 634		    const char *buf, size_t count)			\
 635{									\
 636	int ret;							\
 637	struct scsi_device *sdev;					\
 638	ret = scsi_sdev_check_buf_bit(buf);				\
 639	if (ret >= 0)	{						\
 640		sdev = to_scsi_device(dev);				\
 641		sdev->field = ret;					\
 642		ret = count;						\
 643	}								\
 644	return ret;							\
 645}									\
 646static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 647
 648/*
 649 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 650 * else return -EINVAL.
 651 */
 652static int scsi_sdev_check_buf_bit(const char *buf)
 653{
 654	if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 655		if (buf[0] == '1')
 656			return 1;
 657		else if (buf[0] == '0')
 658			return 0;
 659		else 
 660			return -EINVAL;
 661	} else
 662		return -EINVAL;
 663}
 664#endif
 665/*
 666 * Create the actual show/store functions and data structures.
 667 */
 668sdev_rd_attr (type, "%d\n");
 669sdev_rd_attr (scsi_level, "%d\n");
 670sdev_rd_attr (vendor, "%.8s\n");
 671sdev_rd_attr (model, "%.16s\n");
 672sdev_rd_attr (rev, "%.4s\n");
 673sdev_rd_attr (cdl_supported, "%d\n");
 674
 675static ssize_t
 676sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 677		char *buf)
 678{
 679	struct scsi_device *sdev = to_scsi_device(dev);
 680	return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 681}
 682static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 683
 684static ssize_t
 685sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 686		char *buf)
 687{
 688	struct scsi_device *sdev = to_scsi_device(dev);
 689	return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 690}
 691static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 692
 693/*
 694 * TODO: can we make these symlinks to the block layer ones?
 695 */
 696static ssize_t
 697sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 698{
 699	struct scsi_device *sdev;
 700	sdev = to_scsi_device(dev);
 701	return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 702}
 703
 704static ssize_t
 705sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 706		    const char *buf, size_t count)
 707{
 708	struct scsi_device *sdev;
 709	int timeout;
 710	sdev = to_scsi_device(dev);
 711	sscanf (buf, "%d\n", &timeout);
 712	blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 713	return count;
 714}
 715static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 716
 717static ssize_t
 718sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 719{
 720	struct scsi_device *sdev;
 721	sdev = to_scsi_device(dev);
 722	return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 723}
 724
 725static ssize_t
 726sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 727		    const char *buf, size_t count)
 728{
 729	struct scsi_device *sdev;
 730	unsigned int eh_timeout;
 731	int err;
 732
 733	if (!capable(CAP_SYS_ADMIN))
 734		return -EACCES;
 735
 736	sdev = to_scsi_device(dev);
 737	err = kstrtouint(buf, 10, &eh_timeout);
 738	if (err)
 739		return err;
 740	sdev->eh_timeout = eh_timeout * HZ;
 741
 742	return count;
 743}
 744static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 745
 746static ssize_t
 747store_rescan_field (struct device *dev, struct device_attribute *attr,
 748		    const char *buf, size_t count)
 749{
 750	scsi_rescan_device(to_scsi_device(dev));
 751	return count;
 752}
 753static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 754
 755static ssize_t
 756sdev_store_delete(struct device *dev, struct device_attribute *attr,
 757		  const char *buf, size_t count)
 758{
 759	struct kernfs_node *kn;
 760	struct scsi_device *sdev = to_scsi_device(dev);
 761
 762	/*
 763	 * We need to try to get module, avoiding the module been removed
 764	 * during delete.
 765	 */
 766	if (scsi_device_get(sdev))
 767		return -ENODEV;
 768
 769	kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 770	WARN_ON_ONCE(!kn);
 771	/*
 772	 * Concurrent writes into the "delete" sysfs attribute may trigger
 773	 * concurrent calls to device_remove_file() and scsi_remove_device().
 774	 * device_remove_file() handles concurrent removal calls by
 775	 * serializing these and by ignoring the second and later removal
 776	 * attempts.  Concurrent calls of scsi_remove_device() are
 777	 * serialized. The second and later calls of scsi_remove_device() are
 778	 * ignored because the first call of that function changes the device
 779	 * state into SDEV_DEL.
 780	 */
 781	device_remove_file(dev, attr);
 782	scsi_remove_device(sdev);
 783	if (kn)
 784		sysfs_unbreak_active_protection(kn);
 785	scsi_device_put(sdev);
 786	return count;
 787};
 788static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 789
 790static ssize_t
 791store_state_field(struct device *dev, struct device_attribute *attr,
 792		  const char *buf, size_t count)
 793{
 794	int i, ret;
 795	struct scsi_device *sdev = to_scsi_device(dev);
 796	enum scsi_device_state state = 0;
 797	bool rescan_dev = false;
 798
 799	for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 800		const int len = strlen(sdev_states[i].name);
 801		if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 802		   buf[len] == '\n') {
 803			state = sdev_states[i].value;
 804			break;
 805		}
 806	}
 807	switch (state) {
 808	case SDEV_RUNNING:
 809	case SDEV_OFFLINE:
 810		break;
 811	default:
 812		return -EINVAL;
 813	}
 814
 815	mutex_lock(&sdev->state_mutex);
 816	switch (sdev->sdev_state) {
 817	case SDEV_RUNNING:
 818	case SDEV_OFFLINE:
 819		break;
 820	default:
 821		mutex_unlock(&sdev->state_mutex);
 822		return -EINVAL;
 823	}
 824	if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
 825		ret = 0;
 826	} else {
 827		ret = scsi_device_set_state(sdev, state);
 828		if (ret == 0 && state == SDEV_RUNNING)
 829			rescan_dev = true;
 830	}
 831	mutex_unlock(&sdev->state_mutex);
 832
 833	if (rescan_dev) {
 834		/*
 835		 * If the device state changes to SDEV_RUNNING, we need to
 836		 * run the queue to avoid I/O hang, and rescan the device
 837		 * to revalidate it. Running the queue first is necessary
 838		 * because another thread may be waiting inside
 839		 * blk_mq_freeze_queue_wait() and because that call may be
 840		 * waiting for pending I/O to finish.
 841		 */
 842		blk_mq_run_hw_queues(sdev->request_queue, true);
 843		scsi_rescan_device(sdev);
 844	}
 845
 846	return ret == 0 ? count : -EINVAL;
 847}
 848
 849static ssize_t
 850show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 851{
 852	struct scsi_device *sdev = to_scsi_device(dev);
 853	const char *name = scsi_device_state_name(sdev->sdev_state);
 854
 855	if (!name)
 856		return -EINVAL;
 857
 858	return snprintf(buf, 20, "%s\n", name);
 859}
 860
 861static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 862
 863static ssize_t
 864show_queue_type_field(struct device *dev, struct device_attribute *attr,
 865		      char *buf)
 866{
 867	struct scsi_device *sdev = to_scsi_device(dev);
 868	const char *name = "none";
 869
 870	if (sdev->simple_tags)
 871		name = "simple";
 872
 873	return snprintf(buf, 20, "%s\n", name);
 874}
 875
 876static ssize_t
 877store_queue_type_field(struct device *dev, struct device_attribute *attr,
 878		       const char *buf, size_t count)
 879{
 880	struct scsi_device *sdev = to_scsi_device(dev);
 881
 882	if (!sdev->tagged_supported)
 883		return -EINVAL;
 884		
 885	sdev_printk(KERN_INFO, sdev,
 886		    "ignoring write to deprecated queue_type attribute");
 887	return count;
 888}
 889
 890static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 891		   store_queue_type_field);
 892
 893#define sdev_vpd_pg_attr(_page)						\
 894static ssize_t							\
 895show_vpd_##_page(struct file *filp, struct kobject *kobj,	\
 896		 struct bin_attribute *bin_attr,			\
 897		 char *buf, loff_t off, size_t count)			\
 898{									\
 899	struct device *dev = kobj_to_dev(kobj);				\
 900	struct scsi_device *sdev = to_scsi_device(dev);			\
 901	struct scsi_vpd *vpd_page;					\
 902	int ret = -EINVAL;						\
 903									\
 904	rcu_read_lock();						\
 905	vpd_page = rcu_dereference(sdev->vpd_##_page);			\
 906	if (vpd_page)							\
 907		ret = memory_read_from_buffer(buf, count, &off,		\
 908				vpd_page->data, vpd_page->len);		\
 909	rcu_read_unlock();						\
 910	return ret;							\
 911}									\
 912static struct bin_attribute dev_attr_vpd_##_page = {		\
 913	.attr =	{.name = __stringify(vpd_##_page), .mode = S_IRUGO },	\
 914	.size = 0,							\
 915	.read = show_vpd_##_page,					\
 916};
 917
 918sdev_vpd_pg_attr(pg83);
 919sdev_vpd_pg_attr(pg80);
 920sdev_vpd_pg_attr(pg89);
 921sdev_vpd_pg_attr(pgb0);
 922sdev_vpd_pg_attr(pgb1);
 923sdev_vpd_pg_attr(pgb2);
 924sdev_vpd_pg_attr(pg0);
 925
 926static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 927			    struct bin_attribute *bin_attr,
 928			    char *buf, loff_t off, size_t count)
 929{
 930	struct device *dev = kobj_to_dev(kobj);
 931	struct scsi_device *sdev = to_scsi_device(dev);
 932
 933	if (!sdev->inquiry)
 934		return -EINVAL;
 935
 936	return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 937				       sdev->inquiry_len);
 938}
 939
 940static struct bin_attribute dev_attr_inquiry = {
 941	.attr = {
 942		.name = "inquiry",
 943		.mode = S_IRUGO,
 944	},
 945	.size = 0,
 946	.read = show_inquiry,
 947};
 948
 949static ssize_t
 950show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 951			char *buf)
 952{
 953	return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 954}
 955
 956static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 957
 958#define show_sdev_iostat(field)						\
 959static ssize_t								\
 960show_iostat_##field(struct device *dev, struct device_attribute *attr,	\
 961		    char *buf)						\
 962{									\
 963	struct scsi_device *sdev = to_scsi_device(dev);			\
 964	unsigned long long count = atomic_read(&sdev->field);		\
 965	return snprintf(buf, 20, "0x%llx\n", count);			\
 966}									\
 967static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 968
 969show_sdev_iostat(iorequest_cnt);
 970show_sdev_iostat(iodone_cnt);
 971show_sdev_iostat(ioerr_cnt);
 972show_sdev_iostat(iotmo_cnt);
 973
 974static ssize_t
 975sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 976{
 977	struct scsi_device *sdev;
 978	sdev = to_scsi_device(dev);
 979	return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 980}
 981static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 982
 983#define DECLARE_EVT_SHOW(name, Cap_name)				\
 984static ssize_t								\
 985sdev_show_evt_##name(struct device *dev, struct device_attribute *attr,	\
 986		     char *buf)						\
 987{									\
 988	struct scsi_device *sdev = to_scsi_device(dev);			\
 989	int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 990	return snprintf(buf, 20, "%d\n", val);				\
 991}
 992
 993#define DECLARE_EVT_STORE(name, Cap_name)				\
 994static ssize_t								\
 995sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 996		      const char *buf, size_t count)			\
 997{									\
 998	struct scsi_device *sdev = to_scsi_device(dev);			\
 999	int val = simple_strtoul(buf, NULL, 0);				\
1000	if (val == 0)							\
1001		clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events);	\
1002	else if (val == 1)						\
1003		set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);	\
1004	else								\
1005		return -EINVAL;						\
1006	return count;							\
1007}
1008
1009#define DECLARE_EVT(name, Cap_name)					\
1010	DECLARE_EVT_SHOW(name, Cap_name)				\
1011	DECLARE_EVT_STORE(name, Cap_name)				\
1012	static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,	\
1013			   sdev_store_evt_##name);
1014#define REF_EVT(name) &dev_attr_evt_##name.attr
1015
1016DECLARE_EVT(media_change, MEDIA_CHANGE)
1017DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1018DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1019DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1020DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1021DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1022
1023static ssize_t
1024sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1025		       const char *buf, size_t count)
1026{
1027	int depth, retval;
1028	struct scsi_device *sdev = to_scsi_device(dev);
1029	const struct scsi_host_template *sht = sdev->host->hostt;
1030
1031	if (!sht->change_queue_depth)
1032		return -EINVAL;
1033
1034	depth = simple_strtoul(buf, NULL, 0);
1035
1036	if (depth < 1 || depth > sdev->host->can_queue)
1037		return -EINVAL;
1038
1039	retval = sht->change_queue_depth(sdev, depth);
1040	if (retval < 0)
1041		return retval;
1042
1043	sdev->max_queue_depth = sdev->queue_depth;
1044
1045	return count;
1046}
1047sdev_show_function(queue_depth, "%d\n");
1048
1049static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1050		   sdev_store_queue_depth);
1051
1052static ssize_t
1053sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1054		    char *buf)
1055{
1056	struct scsi_device *sdev = to_scsi_device(dev);
1057	ssize_t count;
1058
1059	count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1060	if (count > 0) {
1061		buf[count] = '\n';
1062		count++;
1063	}
1064	return count;
1065}
1066static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1067
1068#define BLIST_FLAG_NAME(name)					\
1069	[const_ilog2((__force __u64)BLIST_##name)] = #name
1070static const char *const sdev_bflags_name[] = {
1071#include "scsi_devinfo_tbl.c"
1072};
1073#undef BLIST_FLAG_NAME
1074
1075static ssize_t
1076sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1077		    char *buf)
1078{
1079	struct scsi_device *sdev = to_scsi_device(dev);
1080	int i;
1081	ssize_t len = 0;
1082
1083	for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1084		const char *name = NULL;
1085
1086		if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1087			continue;
1088		if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1089			name = sdev_bflags_name[i];
1090
1091		if (name)
1092			len += scnprintf(buf + len, PAGE_SIZE - len,
1093					 "%s%s", len ? " " : "", name);
1094		else
1095			len += scnprintf(buf + len, PAGE_SIZE - len,
1096					 "%sINVALID_BIT(%d)", len ? " " : "", i);
1097	}
1098	if (len)
1099		len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1100	return len;
1101}
1102static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1103
1104#ifdef CONFIG_SCSI_DH
1105static ssize_t
1106sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1107		   char *buf)
1108{
1109	struct scsi_device *sdev = to_scsi_device(dev);
1110
1111	if (!sdev->handler)
1112		return snprintf(buf, 20, "detached\n");
1113
1114	return snprintf(buf, 20, "%s\n", sdev->handler->name);
1115}
1116
1117static ssize_t
1118sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1119		    const char *buf, size_t count)
1120{
1121	struct scsi_device *sdev = to_scsi_device(dev);
1122	int err = -EINVAL;
1123
1124	if (sdev->sdev_state == SDEV_CANCEL ||
1125	    sdev->sdev_state == SDEV_DEL)
1126		return -ENODEV;
1127
1128	if (!sdev->handler) {
1129		/*
1130		 * Attach to a device handler
1131		 */
1132		err = scsi_dh_attach(sdev->request_queue, buf);
1133	} else if (!strncmp(buf, "activate", 8)) {
1134		/*
1135		 * Activate a device handler
1136		 */
1137		if (sdev->handler->activate)
1138			err = sdev->handler->activate(sdev, NULL, NULL);
1139		else
1140			err = 0;
1141	} else if (!strncmp(buf, "detach", 6)) {
1142		/*
1143		 * Detach from a device handler
1144		 */
1145		sdev_printk(KERN_WARNING, sdev,
1146			    "can't detach handler %s.\n",
1147			    sdev->handler->name);
1148		err = -EINVAL;
1149	}
1150
1151	return err < 0 ? err : count;
1152}
1153
1154static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1155		   sdev_store_dh_state);
1156
1157static ssize_t
1158sdev_show_access_state(struct device *dev,
1159		       struct device_attribute *attr,
1160		       char *buf)
1161{
1162	struct scsi_device *sdev = to_scsi_device(dev);
1163	unsigned char access_state;
1164	const char *access_state_name;
1165
1166	if (!sdev->handler)
1167		return -EINVAL;
1168
1169	access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1170	access_state_name = scsi_access_state_name(access_state);
1171
1172	return sprintf(buf, "%s\n",
1173		       access_state_name ? access_state_name : "unknown");
1174}
1175static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1176
1177static ssize_t
1178sdev_show_preferred_path(struct device *dev,
1179			 struct device_attribute *attr,
1180			 char *buf)
1181{
1182	struct scsi_device *sdev = to_scsi_device(dev);
1183
1184	if (!sdev->handler)
1185		return -EINVAL;
1186
1187	if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1188		return sprintf(buf, "1\n");
1189	else
1190		return sprintf(buf, "0\n");
1191}
1192static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1193#endif
1194
1195static ssize_t
1196sdev_show_queue_ramp_up_period(struct device *dev,
1197			       struct device_attribute *attr,
1198			       char *buf)
1199{
1200	struct scsi_device *sdev;
1201	sdev = to_scsi_device(dev);
1202	return snprintf(buf, 20, "%u\n",
1203			jiffies_to_msecs(sdev->queue_ramp_up_period));
1204}
1205
1206static ssize_t
1207sdev_store_queue_ramp_up_period(struct device *dev,
1208				struct device_attribute *attr,
1209				const char *buf, size_t count)
1210{
1211	struct scsi_device *sdev = to_scsi_device(dev);
1212	unsigned int period;
1213
1214	if (kstrtouint(buf, 10, &period))
1215		return -EINVAL;
1216
1217	sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1218	return count;
1219}
1220
1221static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1222		   sdev_show_queue_ramp_up_period,
1223		   sdev_store_queue_ramp_up_period);
1224
1225static ssize_t sdev_show_cdl_enable(struct device *dev,
1226				    struct device_attribute *attr, char *buf)
1227{
1228	struct scsi_device *sdev = to_scsi_device(dev);
1229
1230	return sysfs_emit(buf, "%d\n", (int)sdev->cdl_enable);
1231}
1232
1233static ssize_t sdev_store_cdl_enable(struct device *dev,
1234				     struct device_attribute *attr,
1235				     const char *buf, size_t count)
1236{
1237	int ret;
1238	bool v;
1239
1240	if (kstrtobool(buf, &v))
1241		return -EINVAL;
1242
1243	ret = scsi_cdl_enable(to_scsi_device(dev), v);
1244	if (ret)
1245		return ret;
1246
1247	return count;
1248}
1249static DEVICE_ATTR(cdl_enable, S_IRUGO | S_IWUSR,
1250		   sdev_show_cdl_enable, sdev_store_cdl_enable);
1251
1252static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1253					 struct attribute *attr, int i)
1254{
1255	struct device *dev = kobj_to_dev(kobj);
1256	struct scsi_device *sdev = to_scsi_device(dev);
1257
1258
1259	if (attr == &dev_attr_queue_depth.attr &&
1260	    !sdev->host->hostt->change_queue_depth)
1261		return S_IRUGO;
1262
1263	if (attr == &dev_attr_queue_ramp_up_period.attr &&
1264	    !sdev->host->hostt->change_queue_depth)
1265		return 0;
1266
1267	return attr->mode;
1268}
1269
1270static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1271					     struct bin_attribute *attr, int i)
1272{
1273	struct device *dev = kobj_to_dev(kobj);
1274	struct scsi_device *sdev = to_scsi_device(dev);
1275
1276
1277	if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1278		return 0;
1279
1280	if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1281		return 0;
1282
1283	if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1284		return 0;
1285
1286	if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1287		return 0;
1288
1289	if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1290		return 0;
1291
1292	if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1293		return 0;
1294
1295	if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1296		return 0;
1297
1298	return S_IRUGO;
1299}
1300
1301/* Default template for device attributes.  May NOT be modified */
1302static struct attribute *scsi_sdev_attrs[] = {
1303	&dev_attr_device_blocked.attr,
1304	&dev_attr_type.attr,
1305	&dev_attr_scsi_level.attr,
1306	&dev_attr_device_busy.attr,
1307	&dev_attr_vendor.attr,
1308	&dev_attr_model.attr,
1309	&dev_attr_rev.attr,
1310	&dev_attr_rescan.attr,
1311	&dev_attr_delete.attr,
1312	&dev_attr_state.attr,
1313	&dev_attr_timeout.attr,
1314	&dev_attr_eh_timeout.attr,
1315	&dev_attr_iocounterbits.attr,
1316	&dev_attr_iorequest_cnt.attr,
1317	&dev_attr_iodone_cnt.attr,
1318	&dev_attr_ioerr_cnt.attr,
1319	&dev_attr_iotmo_cnt.attr,
1320	&dev_attr_modalias.attr,
1321	&dev_attr_queue_depth.attr,
1322	&dev_attr_queue_type.attr,
1323	&dev_attr_wwid.attr,
1324	&dev_attr_blacklist.attr,
1325#ifdef CONFIG_SCSI_DH
1326	&dev_attr_dh_state.attr,
1327	&dev_attr_access_state.attr,
1328	&dev_attr_preferred_path.attr,
1329#endif
1330	&dev_attr_queue_ramp_up_period.attr,
1331	&dev_attr_cdl_supported.attr,
1332	&dev_attr_cdl_enable.attr,
1333	REF_EVT(media_change),
1334	REF_EVT(inquiry_change_reported),
1335	REF_EVT(capacity_change_reported),
1336	REF_EVT(soft_threshold_reached),
1337	REF_EVT(mode_parameter_change_reported),
1338	REF_EVT(lun_change_reported),
1339	NULL
1340};
1341
1342static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1343	&dev_attr_vpd_pg0,
1344	&dev_attr_vpd_pg83,
1345	&dev_attr_vpd_pg80,
1346	&dev_attr_vpd_pg89,
1347	&dev_attr_vpd_pgb0,
1348	&dev_attr_vpd_pgb1,
1349	&dev_attr_vpd_pgb2,
1350	&dev_attr_inquiry,
1351	NULL
1352};
1353static struct attribute_group scsi_sdev_attr_group = {
1354	.attrs =	scsi_sdev_attrs,
1355	.bin_attrs =	scsi_sdev_bin_attrs,
1356	.is_visible =	scsi_sdev_attr_is_visible,
1357	.is_bin_visible = scsi_sdev_bin_attr_is_visible,
1358};
1359
1360static const struct attribute_group *scsi_sdev_attr_groups[] = {
1361	&scsi_sdev_attr_group,
1362	NULL
1363};
1364
1365static int scsi_target_add(struct scsi_target *starget)
1366{
1367	int error;
1368
1369	if (starget->state != STARGET_CREATED)
1370		return 0;
1371
1372	error = device_add(&starget->dev);
1373	if (error) {
1374		dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1375		return error;
1376	}
1377	transport_add_device(&starget->dev);
1378	starget->state = STARGET_RUNNING;
1379
1380	pm_runtime_set_active(&starget->dev);
1381	pm_runtime_enable(&starget->dev);
1382	device_enable_async_suspend(&starget->dev);
1383
1384	return 0;
1385}
1386
1387/**
1388 * scsi_sysfs_add_sdev - add scsi device to sysfs
1389 * @sdev:	scsi_device to add
1390 *
1391 * Return value:
1392 * 	0 on Success / non-zero on Failure
1393 **/
1394int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1395{
1396	int error;
1397	struct scsi_target *starget = sdev->sdev_target;
1398
1399	error = scsi_target_add(starget);
1400	if (error)
1401		return error;
1402
1403	transport_configure_device(&starget->dev);
1404
1405	device_enable_async_suspend(&sdev->sdev_gendev);
1406	scsi_autopm_get_target(starget);
1407	pm_runtime_set_active(&sdev->sdev_gendev);
1408	if (!sdev->rpm_autosuspend)
1409		pm_runtime_forbid(&sdev->sdev_gendev);
1410	pm_runtime_enable(&sdev->sdev_gendev);
1411	scsi_autopm_put_target(starget);
1412
1413	scsi_autopm_get_device(sdev);
1414
1415	scsi_dh_add_device(sdev);
1416
1417	error = device_add(&sdev->sdev_gendev);
1418	if (error) {
1419		sdev_printk(KERN_INFO, sdev,
1420				"failed to add device: %d\n", error);
1421		return error;
1422	}
1423
1424	device_enable_async_suspend(&sdev->sdev_dev);
1425	error = device_add(&sdev->sdev_dev);
1426	if (error) {
1427		sdev_printk(KERN_INFO, sdev,
1428				"failed to add class device: %d\n", error);
1429		device_del(&sdev->sdev_gendev);
1430		return error;
1431	}
1432	transport_add_device(&sdev->sdev_gendev);
1433	sdev->is_visible = 1;
1434
1435	if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1436		sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1437		if (IS_ERR(sdev->bsg_dev)) {
1438			error = PTR_ERR(sdev->bsg_dev);
1439			sdev_printk(KERN_INFO, sdev,
1440				    "Failed to register bsg queue, errno=%d\n",
1441				    error);
1442			sdev->bsg_dev = NULL;
1443		}
1444	}
1445
1446	scsi_autopm_put_device(sdev);
1447	return error;
1448}
1449
1450void __scsi_remove_device(struct scsi_device *sdev)
1451{
1452	struct device *dev = &sdev->sdev_gendev;
1453	int res;
1454
1455	/*
1456	 * This cleanup path is not reentrant and while it is impossible
1457	 * to get a new reference with scsi_device_get() someone can still
1458	 * hold a previously acquired one.
1459	 */
1460	if (sdev->sdev_state == SDEV_DEL)
1461		return;
1462
1463	if (sdev->is_visible) {
1464		/*
1465		 * If scsi_internal_target_block() is running concurrently,
1466		 * wait until it has finished before changing the device state.
1467		 */
1468		mutex_lock(&sdev->state_mutex);
1469		/*
1470		 * If blocked, we go straight to DEL and restart the queue so
1471		 * any commands issued during driver shutdown (like sync
1472		 * cache) are errored immediately.
1473		 */
1474		res = scsi_device_set_state(sdev, SDEV_CANCEL);
1475		if (res != 0) {
1476			res = scsi_device_set_state(sdev, SDEV_DEL);
1477			if (res == 0)
1478				scsi_start_queue(sdev);
1479		}
1480		mutex_unlock(&sdev->state_mutex);
1481
1482		if (res != 0)
1483			return;
1484
1485		if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1486			bsg_unregister_queue(sdev->bsg_dev);
1487		device_unregister(&sdev->sdev_dev);
1488		transport_remove_device(dev);
1489		device_del(dev);
1490	} else
1491		put_device(&sdev->sdev_dev);
1492
1493	/*
1494	 * Stop accepting new requests and wait until all queuecommand() and
1495	 * scsi_run_queue() invocations have finished before tearing down the
1496	 * device.
1497	 */
1498	mutex_lock(&sdev->state_mutex);
1499	scsi_device_set_state(sdev, SDEV_DEL);
1500	mutex_unlock(&sdev->state_mutex);
1501
1502	blk_mq_destroy_queue(sdev->request_queue);
1503	kref_put(&sdev->host->tagset_refcnt, scsi_mq_free_tags);
1504	cancel_work_sync(&sdev->requeue_work);
1505
1506	if (sdev->host->hostt->slave_destroy)
1507		sdev->host->hostt->slave_destroy(sdev);
1508	transport_destroy_device(dev);
1509
1510	/*
1511	 * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1512	 * removed sysfs visibility from the device, so make the target
1513	 * invisible if this was the last device underneath it.
1514	 */
1515	scsi_target_reap(scsi_target(sdev));
1516
1517	put_device(dev);
1518}
1519
1520/**
1521 * scsi_remove_device - unregister a device from the scsi bus
1522 * @sdev:	scsi_device to unregister
1523 **/
1524void scsi_remove_device(struct scsi_device *sdev)
1525{
1526	struct Scsi_Host *shost = sdev->host;
1527
1528	mutex_lock(&shost->scan_mutex);
1529	__scsi_remove_device(sdev);
1530	mutex_unlock(&shost->scan_mutex);
1531}
1532EXPORT_SYMBOL(scsi_remove_device);
1533
1534static void __scsi_remove_target(struct scsi_target *starget)
1535{
1536	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1537	unsigned long flags;
1538	struct scsi_device *sdev;
1539
1540	spin_lock_irqsave(shost->host_lock, flags);
1541 restart:
1542	list_for_each_entry(sdev, &shost->__devices, siblings) {
1543		/*
1544		 * We cannot call scsi_device_get() here, as
1545		 * we might've been called from rmmod() causing
1546		 * scsi_device_get() to fail the module_is_live()
1547		 * check.
1548		 */
1549		if (sdev->channel != starget->channel ||
1550		    sdev->id != starget->id)
1551			continue;
1552		if (sdev->sdev_state == SDEV_DEL ||
1553		    sdev->sdev_state == SDEV_CANCEL ||
1554		    !get_device(&sdev->sdev_gendev))
1555			continue;
1556		spin_unlock_irqrestore(shost->host_lock, flags);
1557		scsi_remove_device(sdev);
1558		put_device(&sdev->sdev_gendev);
1559		spin_lock_irqsave(shost->host_lock, flags);
1560		goto restart;
1561	}
1562	spin_unlock_irqrestore(shost->host_lock, flags);
1563}
1564
1565/**
1566 * scsi_remove_target - try to remove a target and all its devices
1567 * @dev: generic starget or parent of generic stargets to be removed
1568 *
1569 * Note: This is slightly racy.  It is possible that if the user
1570 * requests the addition of another device then the target won't be
1571 * removed.
1572 */
1573void scsi_remove_target(struct device *dev)
1574{
1575	struct Scsi_Host *shost = dev_to_shost(dev->parent);
1576	struct scsi_target *starget;
1577	unsigned long flags;
1578
1579restart:
1580	spin_lock_irqsave(shost->host_lock, flags);
1581	list_for_each_entry(starget, &shost->__targets, siblings) {
1582		if (starget->state == STARGET_DEL ||
1583		    starget->state == STARGET_REMOVE ||
1584		    starget->state == STARGET_CREATED_REMOVE)
1585			continue;
1586		if (starget->dev.parent == dev || &starget->dev == dev) {
1587			kref_get(&starget->reap_ref);
1588			if (starget->state == STARGET_CREATED)
1589				starget->state = STARGET_CREATED_REMOVE;
1590			else
1591				starget->state = STARGET_REMOVE;
1592			spin_unlock_irqrestore(shost->host_lock, flags);
1593			__scsi_remove_target(starget);
1594			scsi_target_reap(starget);
1595			goto restart;
1596		}
1597	}
1598	spin_unlock_irqrestore(shost->host_lock, flags);
1599}
1600EXPORT_SYMBOL(scsi_remove_target);
1601
1602int scsi_register_driver(struct device_driver *drv)
1603{
1604	drv->bus = &scsi_bus_type;
1605
1606	return driver_register(drv);
1607}
1608EXPORT_SYMBOL(scsi_register_driver);
1609
1610int scsi_register_interface(struct class_interface *intf)
1611{
1612	intf->class = &sdev_class;
1613
1614	return class_interface_register(intf);
1615}
1616EXPORT_SYMBOL(scsi_register_interface);
1617
1618/**
1619 * scsi_sysfs_add_host - add scsi host to subsystem
1620 * @shost:     scsi host struct to add to subsystem
1621 **/
1622int scsi_sysfs_add_host(struct Scsi_Host *shost)
1623{
1624	transport_register_device(&shost->shost_gendev);
1625	transport_configure_device(&shost->shost_gendev);
1626	return 0;
1627}
1628
1629static struct device_type scsi_dev_type = {
1630	.name =		"scsi_device",
1631	.release =	scsi_device_dev_release,
1632	.groups =	scsi_sdev_attr_groups,
1633};
1634
1635void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1636{
1637	unsigned long flags;
1638	struct Scsi_Host *shost = sdev->host;
1639	const struct scsi_host_template *hostt = shost->hostt;
1640	struct scsi_target  *starget = sdev->sdev_target;
1641
1642	device_initialize(&sdev->sdev_gendev);
1643	sdev->sdev_gendev.bus = &scsi_bus_type;
1644	sdev->sdev_gendev.type = &scsi_dev_type;
1645	scsi_enable_async_suspend(&sdev->sdev_gendev);
1646	dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1647		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1648	sdev->sdev_gendev.groups = hostt->sdev_groups;
1649
1650	device_initialize(&sdev->sdev_dev);
1651	sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1652	sdev->sdev_dev.class = &sdev_class;
1653	dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1654		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1655	/*
1656	 * Get a default scsi_level from the target (derived from sibling
1657	 * devices).  This is the best we can do for guessing how to set
1658	 * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1659	 * setting doesn't matter, because all the bits are zero anyway.
1660	 * But it does matter for higher LUNs.
1661	 */
1662	sdev->scsi_level = starget->scsi_level;
1663	if (sdev->scsi_level <= SCSI_2 &&
1664			sdev->scsi_level != SCSI_UNKNOWN &&
1665			!shost->no_scsi2_lun_in_cdb)
1666		sdev->lun_in_cdb = 1;
1667
1668	transport_setup_device(&sdev->sdev_gendev);
1669	spin_lock_irqsave(shost->host_lock, flags);
1670	list_add_tail(&sdev->same_target_siblings, &starget->devices);
1671	list_add_tail(&sdev->siblings, &shost->__devices);
1672	spin_unlock_irqrestore(shost->host_lock, flags);
1673	/*
1674	 * device can now only be removed via __scsi_remove_device() so hold
1675	 * the target.  Target will be held in CREATED state until something
1676	 * beneath it becomes visible (in which case it moves to RUNNING)
1677	 */
1678	kref_get(&starget->reap_ref);
1679}
1680
1681int scsi_is_sdev_device(const struct device *dev)
1682{
1683	return dev->type == &scsi_dev_type;
1684}
1685EXPORT_SYMBOL(scsi_is_sdev_device);
1686
1687/* A blank transport template that is used in drivers that don't
1688 * yet implement Transport Attributes */
1689struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };