scsi_sysfs.c

   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 const 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, 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, 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	struct scsi_vpd *vpd_pgb7 = NULL;
 453	unsigned long flags;
 454
 455	might_sleep();
 456
 457	scsi_dh_release_device(sdev);
 458
 459	parent = sdev->sdev_gendev.parent;
 460
 461	spin_lock_irqsave(sdev->host->host_lock, flags);
 462	list_del(&sdev->siblings);
 463	list_del(&sdev->same_target_siblings);
 464	list_del(&sdev->starved_entry);
 465	spin_unlock_irqrestore(sdev->host->host_lock, flags);
 466
 467	cancel_work_sync(&sdev->event_work);
 468
 469	list_for_each_safe(this, tmp, &sdev->event_list) {
 470		struct scsi_event *evt;
 471
 472		evt = list_entry(this, struct scsi_event, node);
 473		list_del(&evt->node);
 474		kfree(evt);
 475	}
 476
 477	blk_put_queue(sdev->request_queue);
 478	/* NULL queue means the device can't be used */
 479	sdev->request_queue = NULL;
 480
 481	sbitmap_free(&sdev->budget_map);
 482
 483	mutex_lock(&sdev->inquiry_mutex);
 484	vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 485				       lockdep_is_held(&sdev->inquiry_mutex));
 486	vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 487				       lockdep_is_held(&sdev->inquiry_mutex));
 488	vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 489				       lockdep_is_held(&sdev->inquiry_mutex));
 490	vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 491				       lockdep_is_held(&sdev->inquiry_mutex));
 492	vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
 493				       lockdep_is_held(&sdev->inquiry_mutex));
 494	vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
 495				       lockdep_is_held(&sdev->inquiry_mutex));
 496	vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
 497				       lockdep_is_held(&sdev->inquiry_mutex));
 498	vpd_pgb7 = rcu_replace_pointer(sdev->vpd_pgb7, vpd_pgb7,
 499				       lockdep_is_held(&sdev->inquiry_mutex));
 500	mutex_unlock(&sdev->inquiry_mutex);
 501
 502	if (vpd_pg0)
 503		kfree_rcu(vpd_pg0, rcu);
 504	if (vpd_pg83)
 505		kfree_rcu(vpd_pg83, rcu);
 506	if (vpd_pg80)
 507		kfree_rcu(vpd_pg80, rcu);
 508	if (vpd_pg89)
 509		kfree_rcu(vpd_pg89, rcu);
 510	if (vpd_pgb0)
 511		kfree_rcu(vpd_pgb0, rcu);
 512	if (vpd_pgb1)
 513		kfree_rcu(vpd_pgb1, rcu);
 514	if (vpd_pgb2)
 515		kfree_rcu(vpd_pgb2, rcu);
 516	if (vpd_pgb7)
 517		kfree_rcu(vpd_pgb7, rcu);
 518	kfree(sdev->inquiry);
 519	kfree(sdev);
 520
 521	if (parent)
 522		put_device(parent);
 523}
 524
 525static struct class sdev_class = {
 526	.name		= "scsi_device",
 527	.dev_release	= scsi_device_cls_release,
 528};
 529
 530/* all probing is done in the individual ->probe routines */
 531static int scsi_bus_match(struct device *dev, const struct device_driver *gendrv)
 532{
 533	struct scsi_device *sdp;
 534
 535	if (dev->type != &scsi_dev_type)
 536		return 0;
 537
 538	sdp = to_scsi_device(dev);
 539	if (sdp->no_uld_attach)
 540		return 0;
 541	return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 542}
 543
 544static int scsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 545{
 546	const struct scsi_device *sdev;
 547
 548	if (dev->type != &scsi_dev_type)
 549		return 0;
 550
 551	sdev = to_scsi_device(dev);
 552
 553	add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 554	return 0;
 555}
 556
 557const struct bus_type scsi_bus_type = {
 558        .name		= "scsi",
 559        .match		= scsi_bus_match,
 560	.uevent		= scsi_bus_uevent,
 561#ifdef CONFIG_PM
 562	.pm		= &scsi_bus_pm_ops,
 563#endif
 564};
 565
 566int scsi_sysfs_register(void)
 567{
 568	int error;
 569
 570	error = bus_register(&scsi_bus_type);
 571	if (!error) {
 572		error = class_register(&sdev_class);
 573		if (error)
 574			bus_unregister(&scsi_bus_type);
 575	}
 576
 577	return error;
 578}
 579
 580void scsi_sysfs_unregister(void)
 581{
 582	class_unregister(&sdev_class);
 583	bus_unregister(&scsi_bus_type);
 584}
 585
 586/*
 587 * sdev_show_function: macro to create an attr function that can be used to
 588 * show a non-bit field.
 589 */
 590#define sdev_show_function(field, format_string)				\
 591static ssize_t								\
 592sdev_show_##field (struct device *dev, struct device_attribute *attr,	\
 593		   char *buf)						\
 594{									\
 595	struct scsi_device *sdev;					\
 596	sdev = to_scsi_device(dev);					\
 597	return snprintf (buf, 20, format_string, sdev->field);		\
 598}									\
 599
 600/*
 601 * sdev_rd_attr: macro to create a function and attribute variable for a
 602 * read only field.
 603 */
 604#define sdev_rd_attr(field, format_string)				\
 605	sdev_show_function(field, format_string)			\
 606static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 607
 608/*
 609 * Create the actual show/store functions and data structures.
 610 */
 611sdev_rd_attr (type, "%d\n");
 612sdev_rd_attr (scsi_level, "%d\n");
 613sdev_rd_attr (vendor, "%.8s\n");
 614sdev_rd_attr (model, "%.16s\n");
 615sdev_rd_attr (rev, "%.4s\n");
 616sdev_rd_attr (cdl_supported, "%d\n");
 617
 618static ssize_t
 619sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 620		char *buf)
 621{
 622	struct scsi_device *sdev = to_scsi_device(dev);
 623	return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 624}
 625static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 626
 627static ssize_t
 628sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 629		char *buf)
 630{
 631	struct scsi_device *sdev = to_scsi_device(dev);
 632	return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 633}
 634static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 635
 636/*
 637 * TODO: can we make these symlinks to the block layer ones?
 638 */
 639static ssize_t
 640sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 641{
 642	struct scsi_device *sdev;
 643	sdev = to_scsi_device(dev);
 644	return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 645}
 646
 647static ssize_t
 648sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 649		    const char *buf, size_t count)
 650{
 651	struct scsi_device *sdev = to_scsi_device(dev);
 652	int ret, timeout;
 653
 654	ret = kstrtoint(buf, 0, &timeout);
 655	if (ret)
 656		return ret;
 657	if (timeout <= 0)
 658		return -EINVAL;
 659	blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 660	return count;
 661}
 662static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 663
 664static ssize_t
 665sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 666{
 667	struct scsi_device *sdev;
 668	sdev = to_scsi_device(dev);
 669	return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 670}
 671
 672static ssize_t
 673sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 674		    const char *buf, size_t count)
 675{
 676	struct scsi_device *sdev;
 677	unsigned int eh_timeout;
 678	int err;
 679
 680	if (!capable(CAP_SYS_ADMIN))
 681		return -EACCES;
 682
 683	sdev = to_scsi_device(dev);
 684	err = kstrtouint(buf, 10, &eh_timeout);
 685	if (err)
 686		return err;
 687	sdev->eh_timeout = eh_timeout * HZ;
 688
 689	return count;
 690}
 691static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 692
 693static ssize_t
 694store_rescan_field (struct device *dev, struct device_attribute *attr,
 695		    const char *buf, size_t count)
 696{
 697	scsi_rescan_device(to_scsi_device(dev));
 698	return count;
 699}
 700static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 701
 702static ssize_t
 703sdev_store_delete(struct device *dev, struct device_attribute *attr,
 704		  const char *buf, size_t count)
 705{
 706	struct kernfs_node *kn;
 707	struct scsi_device *sdev = to_scsi_device(dev);
 708
 709	/*
 710	 * We need to try to get module, avoiding the module been removed
 711	 * during delete.
 712	 */
 713	if (scsi_device_get(sdev))
 714		return -ENODEV;
 715
 716	kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 717	WARN_ON_ONCE(!kn);
 718	/*
 719	 * Concurrent writes into the "delete" sysfs attribute may trigger
 720	 * concurrent calls to device_remove_file() and scsi_remove_device().
 721	 * device_remove_file() handles concurrent removal calls by
 722	 * serializing these and by ignoring the second and later removal
 723	 * attempts.  Concurrent calls of scsi_remove_device() are
 724	 * serialized. The second and later calls of scsi_remove_device() are
 725	 * ignored because the first call of that function changes the device
 726	 * state into SDEV_DEL.
 727	 */
 728	device_remove_file(dev, attr);
 729	scsi_remove_device(sdev);
 730	if (kn)
 731		sysfs_unbreak_active_protection(kn);
 732	scsi_device_put(sdev);
 733	return count;
 734};
 735static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 736
 737static ssize_t
 738store_state_field(struct device *dev, struct device_attribute *attr,
 739		  const char *buf, size_t count)
 740{
 741	int i, ret;
 742	struct scsi_device *sdev = to_scsi_device(dev);
 743	enum scsi_device_state state = 0;
 744	bool rescan_dev = false;
 745
 746	for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 747		const int len = strlen(sdev_states[i].name);
 748		if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 749		   buf[len] == '\n') {
 750			state = sdev_states[i].value;
 751			break;
 752		}
 753	}
 754	switch (state) {
 755	case SDEV_RUNNING:
 756	case SDEV_OFFLINE:
 757		break;
 758	default:
 759		return -EINVAL;
 760	}
 761
 762	mutex_lock(&sdev->state_mutex);
 763	switch (sdev->sdev_state) {
 764	case SDEV_RUNNING:
 765	case SDEV_OFFLINE:
 766		break;
 767	default:
 768		mutex_unlock(&sdev->state_mutex);
 769		return -EINVAL;
 770	}
 771	if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
 772		ret = 0;
 773	} else {
 774		ret = scsi_device_set_state(sdev, state);
 775		if (ret == 0 && state == SDEV_RUNNING)
 776			rescan_dev = true;
 777	}
 778	mutex_unlock(&sdev->state_mutex);
 779
 780	if (rescan_dev) {
 781		/*
 782		 * If the device state changes to SDEV_RUNNING, we need to
 783		 * run the queue to avoid I/O hang, and rescan the device
 784		 * to revalidate it. Running the queue first is necessary
 785		 * because another thread may be waiting inside
 786		 * blk_mq_freeze_queue_wait() and because that call may be
 787		 * waiting for pending I/O to finish.
 788		 */
 789		blk_mq_run_hw_queues(sdev->request_queue, true);
 790		scsi_rescan_device(sdev);
 791	}
 792
 793	return ret == 0 ? count : -EINVAL;
 794}
 795
 796static ssize_t
 797show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 798{
 799	struct scsi_device *sdev = to_scsi_device(dev);
 800	const char *name = scsi_device_state_name(sdev->sdev_state);
 801
 802	if (!name)
 803		return -EINVAL;
 804
 805	return snprintf(buf, 20, "%s\n", name);
 806}
 807
 808static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 809
 810static ssize_t
 811show_queue_type_field(struct device *dev, struct device_attribute *attr,
 812		      char *buf)
 813{
 814	struct scsi_device *sdev = to_scsi_device(dev);
 815	const char *name = "none";
 816
 817	if (sdev->simple_tags)
 818		name = "simple";
 819
 820	return snprintf(buf, 20, "%s\n", name);
 821}
 822
 823static ssize_t
 824store_queue_type_field(struct device *dev, struct device_attribute *attr,
 825		       const char *buf, size_t count)
 826{
 827	struct scsi_device *sdev = to_scsi_device(dev);
 828
 829	if (!sdev->tagged_supported)
 830		return -EINVAL;
 831
 832	sdev_printk(KERN_INFO, sdev,
 833		    "ignoring write to deprecated queue_type attribute");
 834	return count;
 835}
 836
 837static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 838		   store_queue_type_field);
 839
 840#define sdev_vpd_pg_attr(_page)						\
 841static ssize_t							\
 842show_vpd_##_page(struct file *filp, struct kobject *kobj,	\
 843		 const struct bin_attribute *bin_attr,			\
 844		 char *buf, loff_t off, size_t count)			\
 845{									\
 846	struct device *dev = kobj_to_dev(kobj);				\
 847	struct scsi_device *sdev = to_scsi_device(dev);			\
 848	struct scsi_vpd *vpd_page;					\
 849	int ret = -EINVAL;						\
 850									\
 851	rcu_read_lock();						\
 852	vpd_page = rcu_dereference(sdev->vpd_##_page);			\
 853	if (vpd_page)							\
 854		ret = memory_read_from_buffer(buf, count, &off,		\
 855				vpd_page->data, vpd_page->len);		\
 856	rcu_read_unlock();						\
 857	return ret;							\
 858}									\
 859static const struct bin_attribute dev_attr_vpd_##_page = {		\
 860	.attr =	{.name = __stringify(vpd_##_page), .mode = S_IRUGO },	\
 861	.size = 0,							\
 862	.read = show_vpd_##_page,					\
 863};
 864
 865sdev_vpd_pg_attr(pg83);
 866sdev_vpd_pg_attr(pg80);
 867sdev_vpd_pg_attr(pg89);
 868sdev_vpd_pg_attr(pgb0);
 869sdev_vpd_pg_attr(pgb1);
 870sdev_vpd_pg_attr(pgb2);
 871sdev_vpd_pg_attr(pgb7);
 872sdev_vpd_pg_attr(pg0);
 873
 874static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 875			    const struct bin_attribute *bin_attr,
 876			    char *buf, loff_t off, size_t count)
 877{
 878	struct device *dev = kobj_to_dev(kobj);
 879	struct scsi_device *sdev = to_scsi_device(dev);
 880
 881	if (!sdev->inquiry)
 882		return -EINVAL;
 883
 884	return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 885				       sdev->inquiry_len);
 886}
 887
 888static const struct bin_attribute dev_attr_inquiry = {
 889	.attr = {
 890		.name = "inquiry",
 891		.mode = S_IRUGO,
 892	},
 893	.size = 0,
 894	.read = show_inquiry,
 895};
 896
 897static ssize_t
 898show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 899			char *buf)
 900{
 901	return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 902}
 903
 904static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 905
 906#define show_sdev_iostat(field)						\
 907static ssize_t								\
 908show_iostat_##field(struct device *dev, struct device_attribute *attr,	\
 909		    char *buf)						\
 910{									\
 911	struct scsi_device *sdev = to_scsi_device(dev);			\
 912	unsigned long long count = atomic_read(&sdev->field);		\
 913	return snprintf(buf, 20, "0x%llx\n", count);			\
 914}									\
 915static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 916
 917show_sdev_iostat(iorequest_cnt);
 918show_sdev_iostat(iodone_cnt);
 919show_sdev_iostat(ioerr_cnt);
 920show_sdev_iostat(iotmo_cnt);
 921
 922static ssize_t
 923sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 924{
 925	struct scsi_device *sdev;
 926	sdev = to_scsi_device(dev);
 927	return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 928}
 929static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 930
 931#define DECLARE_EVT_SHOW(name, Cap_name)				\
 932static ssize_t								\
 933sdev_show_evt_##name(struct device *dev, struct device_attribute *attr,	\
 934		     char *buf)						\
 935{									\
 936	struct scsi_device *sdev = to_scsi_device(dev);			\
 937	int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 938	return snprintf(buf, 20, "%d\n", val);				\
 939}
 940
 941#define DECLARE_EVT_STORE(name, Cap_name)				\
 942static ssize_t								\
 943sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 944		      const char *buf, size_t count)			\
 945{									\
 946	struct scsi_device *sdev = to_scsi_device(dev);			\
 947	int val = simple_strtoul(buf, NULL, 0);				\
 948	if (val == 0)							\
 949		clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events);	\
 950	else if (val == 1)						\
 951		set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);	\
 952	else								\
 953		return -EINVAL;						\
 954	return count;							\
 955}
 956
 957#define DECLARE_EVT(name, Cap_name)					\
 958	DECLARE_EVT_SHOW(name, Cap_name)				\
 959	DECLARE_EVT_STORE(name, Cap_name)				\
 960	static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,	\
 961			   sdev_store_evt_##name);
 962#define REF_EVT(name) &dev_attr_evt_##name.attr
 963
 964DECLARE_EVT(media_change, MEDIA_CHANGE)
 965DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 966DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 967DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 968DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 969DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 970
 971static ssize_t
 972sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 973		       const char *buf, size_t count)
 974{
 975	int depth, retval;
 976	struct scsi_device *sdev = to_scsi_device(dev);
 977	const struct scsi_host_template *sht = sdev->host->hostt;
 978
 979	if (!sht->change_queue_depth)
 980		return -EINVAL;
 981
 982	depth = simple_strtoul(buf, NULL, 0);
 983
 984	if (depth < 1 || depth > sdev->host->can_queue)
 985		return -EINVAL;
 986
 987	retval = sht->change_queue_depth(sdev, depth);
 988	if (retval < 0)
 989		return retval;
 990
 991	sdev->max_queue_depth = sdev->queue_depth;
 992
 993	return count;
 994}
 995sdev_show_function(queue_depth, "%d\n");
 996
 997static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 998		   sdev_store_queue_depth);
 999
1000static ssize_t
1001sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1002		    char *buf)
1003{
1004	struct scsi_device *sdev = to_scsi_device(dev);
1005	ssize_t count;
1006
1007	count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1008	if (count > 0) {
1009		buf[count] = '\n';
1010		count++;
1011	}
1012	return count;
1013}
1014static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1015
1016#define BLIST_FLAG_NAME(name)					\
1017	[const_ilog2((__force __u64)BLIST_##name)] = #name
1018static const char *const sdev_bflags_name[] = {
1019#include "scsi_devinfo_tbl.c"
1020};
1021#undef BLIST_FLAG_NAME
1022
1023static ssize_t
1024sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1025		    char *buf)
1026{
1027	struct scsi_device *sdev = to_scsi_device(dev);
1028	int i;
1029	ssize_t len = 0;
1030
1031	for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1032		const char *name = NULL;
1033
1034		if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1035			continue;
1036		if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1037			name = sdev_bflags_name[i];
1038
1039		if (name)
1040			len += scnprintf(buf + len, PAGE_SIZE - len,
1041					 "%s%s", len ? " " : "", name);
1042		else
1043			len += scnprintf(buf + len, PAGE_SIZE - len,
1044					 "%sINVALID_BIT(%d)", len ? " " : "", i);
1045	}
1046	if (len)
1047		len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1048	return len;
1049}
1050static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1051
1052#ifdef CONFIG_SCSI_DH
1053static ssize_t
1054sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1055		   char *buf)
1056{
1057	struct scsi_device *sdev = to_scsi_device(dev);
1058
1059	if (!sdev->handler)
1060		return snprintf(buf, 20, "detached\n");
1061
1062	return snprintf(buf, 20, "%s\n", sdev->handler->name);
1063}
1064
1065static ssize_t
1066sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1067		    const char *buf, size_t count)
1068{
1069	struct scsi_device *sdev = to_scsi_device(dev);
1070	int err = -EINVAL;
1071
1072	if (sdev->sdev_state == SDEV_CANCEL ||
1073	    sdev->sdev_state == SDEV_DEL)
1074		return -ENODEV;
1075
1076	if (!sdev->handler) {
1077		/*
1078		 * Attach to a device handler
1079		 */
1080		err = scsi_dh_attach(sdev->request_queue, buf);
1081	} else if (!strncmp(buf, "activate", 8)) {
1082		/*
1083		 * Activate a device handler
1084		 */
1085		if (sdev->handler->activate)
1086			err = sdev->handler->activate(sdev, NULL, NULL);
1087		else
1088			err = 0;
1089	} else if (!strncmp(buf, "detach", 6)) {
1090		/*
1091		 * Detach from a device handler
1092		 */
1093		sdev_printk(KERN_WARNING, sdev,
1094			    "can't detach handler %s.\n",
1095			    sdev->handler->name);
1096		err = -EINVAL;
1097	}
1098
1099	return err < 0 ? err : count;
1100}
1101
1102static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1103		   sdev_store_dh_state);
1104
1105static ssize_t
1106sdev_show_access_state(struct device *dev,
1107		       struct device_attribute *attr,
1108		       char *buf)
1109{
1110	struct scsi_device *sdev = to_scsi_device(dev);
1111	unsigned char access_state;
1112	const char *access_state_name;
1113
1114	if (!sdev->handler)
1115		return -EINVAL;
1116
1117	access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1118	access_state_name = scsi_access_state_name(access_state);
1119
1120	return sprintf(buf, "%s\n",
1121		       access_state_name ? access_state_name : "unknown");
1122}
1123static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1124
1125static ssize_t
1126sdev_show_preferred_path(struct device *dev,
1127			 struct device_attribute *attr,
1128			 char *buf)
1129{
1130	struct scsi_device *sdev = to_scsi_device(dev);
1131
1132	if (!sdev->handler)
1133		return -EINVAL;
1134
1135	if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1136		return sprintf(buf, "1\n");
1137	else
1138		return sprintf(buf, "0\n");
1139}
1140static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1141#endif
1142
1143static ssize_t
1144sdev_show_queue_ramp_up_period(struct device *dev,
1145			       struct device_attribute *attr,
1146			       char *buf)
1147{
1148	struct scsi_device *sdev;
1149	sdev = to_scsi_device(dev);
1150	return snprintf(buf, 20, "%u\n",
1151			jiffies_to_msecs(sdev->queue_ramp_up_period));
1152}
1153
1154static ssize_t
1155sdev_store_queue_ramp_up_period(struct device *dev,
1156				struct device_attribute *attr,
1157				const char *buf, size_t count)
1158{
1159	struct scsi_device *sdev = to_scsi_device(dev);
1160	unsigned int period;
1161
1162	if (kstrtouint(buf, 10, &period))
1163		return -EINVAL;
1164
1165	sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1166	return count;
1167}
1168
1169static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1170		   sdev_show_queue_ramp_up_period,
1171		   sdev_store_queue_ramp_up_period);
1172
1173static ssize_t sdev_show_cdl_enable(struct device *dev,
1174				    struct device_attribute *attr, char *buf)
1175{
1176	struct scsi_device *sdev = to_scsi_device(dev);
1177
1178	return sysfs_emit(buf, "%d\n", (int)sdev->cdl_enable);
1179}
1180
1181static ssize_t sdev_store_cdl_enable(struct device *dev,
1182				     struct device_attribute *attr,
1183				     const char *buf, size_t count)
1184{
1185	int ret;
1186	bool v;
1187
1188	if (kstrtobool(buf, &v))
1189		return -EINVAL;
1190
1191	ret = scsi_cdl_enable(to_scsi_device(dev), v);
1192	if (ret)
1193		return ret;
1194
1195	return count;
1196}
1197static DEVICE_ATTR(cdl_enable, S_IRUGO | S_IWUSR,
1198		   sdev_show_cdl_enable, sdev_store_cdl_enable);
1199
1200static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1201					 struct attribute *attr, int i)
1202{
1203	struct device *dev = kobj_to_dev(kobj);
1204	struct scsi_device *sdev = to_scsi_device(dev);
1205
1206
1207	if (attr == &dev_attr_queue_depth.attr &&
1208	    !sdev->host->hostt->change_queue_depth)
1209		return S_IRUGO;
1210
1211	if (attr == &dev_attr_queue_ramp_up_period.attr &&
1212	    !sdev->host->hostt->change_queue_depth)
1213		return 0;
1214
1215	return attr->mode;
1216}
1217
1218static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1219					     const struct bin_attribute *attr, int i)
1220{
1221	struct device *dev = kobj_to_dev(kobj);
1222	struct scsi_device *sdev = to_scsi_device(dev);
1223
1224
1225	if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1226		return 0;
1227
1228	if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1229		return 0;
1230
1231	if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1232		return 0;
1233
1234	if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1235		return 0;
1236
1237	if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1238		return 0;
1239
1240	if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1241		return 0;
1242
1243	if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1244		return 0;
1245
1246	if (attr == &dev_attr_vpd_pgb7 && !sdev->vpd_pgb7)
1247		return 0;
1248
1249	return S_IRUGO;
1250}
1251
1252/* Default template for device attributes.  May NOT be modified */
1253static struct attribute *scsi_sdev_attrs[] = {
1254	&dev_attr_device_blocked.attr,
1255	&dev_attr_type.attr,
1256	&dev_attr_scsi_level.attr,
1257	&dev_attr_device_busy.attr,
1258	&dev_attr_vendor.attr,
1259	&dev_attr_model.attr,
1260	&dev_attr_rev.attr,
1261	&dev_attr_rescan.attr,
1262	&dev_attr_delete.attr,
1263	&dev_attr_state.attr,
1264	&dev_attr_timeout.attr,
1265	&dev_attr_eh_timeout.attr,
1266	&dev_attr_iocounterbits.attr,
1267	&dev_attr_iorequest_cnt.attr,
1268	&dev_attr_iodone_cnt.attr,
1269	&dev_attr_ioerr_cnt.attr,
1270	&dev_attr_iotmo_cnt.attr,
1271	&dev_attr_modalias.attr,
1272	&dev_attr_queue_depth.attr,
1273	&dev_attr_queue_type.attr,
1274	&dev_attr_wwid.attr,
1275	&dev_attr_blacklist.attr,
1276#ifdef CONFIG_SCSI_DH
1277	&dev_attr_dh_state.attr,
1278	&dev_attr_access_state.attr,
1279	&dev_attr_preferred_path.attr,
1280#endif
1281	&dev_attr_queue_ramp_up_period.attr,
1282	&dev_attr_cdl_supported.attr,
1283	&dev_attr_cdl_enable.attr,
1284	REF_EVT(media_change),
1285	REF_EVT(inquiry_change_reported),
1286	REF_EVT(capacity_change_reported),
1287	REF_EVT(soft_threshold_reached),
1288	REF_EVT(mode_parameter_change_reported),
1289	REF_EVT(lun_change_reported),
1290	NULL
1291};
1292
1293static const struct bin_attribute *const scsi_sdev_bin_attrs[] = {
1294	&dev_attr_vpd_pg0,
1295	&dev_attr_vpd_pg83,
1296	&dev_attr_vpd_pg80,
1297	&dev_attr_vpd_pg89,
1298	&dev_attr_vpd_pgb0,
1299	&dev_attr_vpd_pgb1,
1300	&dev_attr_vpd_pgb2,
1301	&dev_attr_vpd_pgb7,
1302	&dev_attr_inquiry,
1303	NULL
1304};
1305static struct attribute_group scsi_sdev_attr_group = {
1306	.attrs =	scsi_sdev_attrs,
1307	.bin_attrs = scsi_sdev_bin_attrs,
1308	.is_visible =	scsi_sdev_attr_is_visible,
1309	.is_bin_visible = scsi_sdev_bin_attr_is_visible,
1310};
1311
1312static const struct attribute_group *scsi_sdev_attr_groups[] = {
1313	&scsi_sdev_attr_group,
1314	NULL
1315};
1316
1317static int scsi_target_add(struct scsi_target *starget)
1318{
1319	int error;
1320
1321	if (starget->state != STARGET_CREATED)
1322		return 0;
1323
1324	error = device_add(&starget->dev);
1325	if (error) {
1326		dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1327		return error;
1328	}
1329	transport_add_device(&starget->dev);
1330	starget->state = STARGET_RUNNING;
1331
1332	pm_runtime_set_active(&starget->dev);
1333	pm_runtime_enable(&starget->dev);
1334	device_enable_async_suspend(&starget->dev);
1335
1336	return 0;
1337}
1338
1339/**
1340 * scsi_sysfs_add_sdev - add scsi device to sysfs
1341 * @sdev:	scsi_device to add
1342 *
1343 * Return value:
1344 * 	0 on Success / non-zero on Failure
1345 **/
1346int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1347{
1348	int error;
1349	struct scsi_target *starget = sdev->sdev_target;
1350
1351	if (WARN_ON_ONCE(scsi_device_is_pseudo_dev(sdev)))
1352		return -EINVAL;
1353
1354	error = scsi_target_add(starget);
1355	if (error)
1356		return error;
1357
1358	transport_configure_device(&starget->dev);
1359
1360	device_enable_async_suspend(&sdev->sdev_gendev);
1361	scsi_autopm_get_target(starget);
1362	pm_runtime_set_active(&sdev->sdev_gendev);
1363	if (!sdev->rpm_autosuspend)
1364		pm_runtime_forbid(&sdev->sdev_gendev);
1365	pm_runtime_enable(&sdev->sdev_gendev);
1366	scsi_autopm_put_target(starget);
1367
1368	scsi_autopm_get_device(sdev);
1369
1370	scsi_dh_add_device(sdev);
1371
1372	error = device_add(&sdev->sdev_gendev);
1373	if (error) {
1374		sdev_printk(KERN_INFO, sdev,
1375				"failed to add device: %d\n", error);
1376		return error;
1377	}
1378
1379	device_enable_async_suspend(&sdev->sdev_dev);
1380	error = device_add(&sdev->sdev_dev);
1381	if (error) {
1382		sdev_printk(KERN_INFO, sdev,
1383				"failed to add class device: %d\n", error);
1384		device_del(&sdev->sdev_gendev);
1385		return error;
1386	}
1387	transport_add_device(&sdev->sdev_gendev);
1388	sdev->is_visible = 1;
1389
1390	if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1391		sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1392		if (IS_ERR(sdev->bsg_dev)) {
1393			error = PTR_ERR(sdev->bsg_dev);
1394			sdev_printk(KERN_INFO, sdev,
1395				    "Failed to register bsg queue, errno=%d\n",
1396				    error);
1397			sdev->bsg_dev = NULL;
1398		}
1399	}
1400
1401	scsi_autopm_put_device(sdev);
1402	return error;
1403}
1404
1405void __scsi_remove_device(struct scsi_device *sdev)
1406{
1407	struct device *dev = &sdev->sdev_gendev;
1408	int res;
1409
1410	/*
1411	 * This cleanup path is not reentrant and while it is impossible
1412	 * to get a new reference with scsi_device_get() someone can still
1413	 * hold a previously acquired one.
1414	 */
1415	if (sdev->sdev_state == SDEV_DEL)
1416		return;
1417
1418	if (sdev->is_visible) {
1419		/*
1420		 * If scsi_internal_target_block() is running concurrently,
1421		 * wait until it has finished before changing the device state.
1422		 */
1423		mutex_lock(&sdev->state_mutex);
1424		/*
1425		 * If blocked, we go straight to DEL and restart the queue so
1426		 * any commands issued during driver shutdown (like sync
1427		 * cache) are errored immediately.
1428		 */
1429		res = scsi_device_set_state(sdev, SDEV_CANCEL);
1430		if (res != 0) {
1431			res = scsi_device_set_state(sdev, SDEV_DEL);
1432			if (res == 0)
1433				scsi_start_queue(sdev);
1434		}
1435		mutex_unlock(&sdev->state_mutex);
1436
1437		if (res != 0)
1438			return;
1439
1440		if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1441			bsg_unregister_queue(sdev->bsg_dev);
1442		device_unregister(&sdev->sdev_dev);
1443		transport_remove_device(dev);
1444		device_del(dev);
1445	} else
1446		put_device(&sdev->sdev_dev);
1447
1448	/*
1449	 * Stop accepting new requests and wait until all queuecommand() and
1450	 * scsi_run_queue() invocations have finished before tearing down the
1451	 * device.
1452	 */
1453	mutex_lock(&sdev->state_mutex);
1454	scsi_device_set_state(sdev, SDEV_DEL);
1455	mutex_unlock(&sdev->state_mutex);
1456
1457	blk_mq_destroy_queue(sdev->request_queue);
1458	kref_put(&sdev->host->tagset_refcnt, scsi_mq_free_tags);
1459	cancel_work_sync(&sdev->requeue_work);
1460
1461	if (!scsi_device_is_pseudo_dev(sdev) && sdev->host->hostt->sdev_destroy)
1462		sdev->host->hostt->sdev_destroy(sdev);
1463	transport_destroy_device(dev);
1464
1465	/*
1466	 * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1467	 * removed sysfs visibility from the device, so make the target
1468	 * invisible if this was the last device underneath it.
1469	 */
1470	scsi_target_reap(scsi_target(sdev));
1471
1472	put_device(dev);
1473}
1474
1475/**
1476 * scsi_remove_device - unregister a device from the scsi bus
1477 * @sdev:	scsi_device to unregister
1478 **/
1479void scsi_remove_device(struct scsi_device *sdev)
1480{
1481	struct Scsi_Host *shost = sdev->host;
1482
1483	mutex_lock(&shost->scan_mutex);
1484	__scsi_remove_device(sdev);
1485	mutex_unlock(&shost->scan_mutex);
1486}
1487EXPORT_SYMBOL(scsi_remove_device);
1488
1489static void __scsi_remove_target(struct scsi_target *starget)
1490{
1491	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1492	unsigned long flags;
1493	struct scsi_device *sdev;
1494
1495	spin_lock_irqsave(shost->host_lock, flags);
1496 restart:
1497	list_for_each_entry(sdev, &shost->__devices, siblings) {
1498		/*
1499		 * We cannot call scsi_device_get() here, as
1500		 * we might've been called from rmmod() causing
1501		 * scsi_device_get() to fail the module_is_live()
1502		 * check.
1503		 */
1504		if (sdev->channel != starget->channel ||
1505		    sdev->id != starget->id)
1506			continue;
1507		if (sdev->sdev_state == SDEV_DEL ||
1508		    sdev->sdev_state == SDEV_CANCEL ||
1509		    !get_device(&sdev->sdev_gendev))
1510			continue;
1511		spin_unlock_irqrestore(shost->host_lock, flags);
1512		scsi_remove_device(sdev);
1513		put_device(&sdev->sdev_gendev);
1514		spin_lock_irqsave(shost->host_lock, flags);
1515		goto restart;
1516	}
1517	spin_unlock_irqrestore(shost->host_lock, flags);
1518}
1519
1520/**
1521 * scsi_remove_target - try to remove a target and all its devices
1522 * @dev: generic starget or parent of generic stargets to be removed
1523 *
1524 * Note: This is slightly racy.  It is possible that if the user
1525 * requests the addition of another device then the target won't be
1526 * removed.
1527 */
1528void scsi_remove_target(struct device *dev)
1529{
1530	struct Scsi_Host *shost = dev_to_shost(dev->parent);
1531	struct scsi_target *starget;
1532	unsigned long flags;
1533
1534restart:
1535	spin_lock_irqsave(shost->host_lock, flags);
1536	list_for_each_entry(starget, &shost->__targets, siblings) {
1537		if (starget->state == STARGET_DEL ||
1538		    starget->state == STARGET_REMOVE ||
1539		    starget->state == STARGET_CREATED_REMOVE)
1540			continue;
1541		if (starget->dev.parent == dev || &starget->dev == dev) {
1542			kref_get(&starget->reap_ref);
1543			if (starget->state == STARGET_CREATED)
1544				starget->state = STARGET_CREATED_REMOVE;
1545			else
1546				starget->state = STARGET_REMOVE;
1547			spin_unlock_irqrestore(shost->host_lock, flags);
1548			__scsi_remove_target(starget);
1549			scsi_target_reap(starget);
1550			goto restart;
1551		}
1552	}
1553	spin_unlock_irqrestore(shost->host_lock, flags);
1554}
1555EXPORT_SYMBOL(scsi_remove_target);
1556
1557int __scsi_register_driver(struct device_driver *drv, struct module *owner)
1558{
1559	drv->bus = &scsi_bus_type;
1560	drv->owner = owner;
1561
1562	return driver_register(drv);
1563}
1564EXPORT_SYMBOL(__scsi_register_driver);
1565
1566int scsi_register_interface(struct class_interface *intf)
1567{
1568	intf->class = &sdev_class;
1569
1570	return class_interface_register(intf);
1571}
1572EXPORT_SYMBOL(scsi_register_interface);
1573
1574/**
1575 * scsi_sysfs_add_host - add scsi host to subsystem
1576 * @shost:     scsi host struct to add to subsystem
1577 **/
1578int scsi_sysfs_add_host(struct Scsi_Host *shost)
1579{
1580	transport_register_device(&shost->shost_gendev);
1581	transport_configure_device(&shost->shost_gendev);
1582	return 0;
1583}
1584
1585static const struct device_type scsi_dev_type = {
1586	.name =		"scsi_device",
1587	.release =	scsi_device_dev_release,
1588	.groups =	scsi_sdev_attr_groups,
1589};
1590
1591void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1592{
1593	unsigned long flags;
1594	struct Scsi_Host *shost = sdev->host;
1595	const struct scsi_host_template *hostt = shost->hostt;
1596	struct scsi_target  *starget = sdev->sdev_target;
1597
1598	device_initialize(&sdev->sdev_gendev);
1599	sdev->sdev_gendev.bus = &scsi_bus_type;
1600	sdev->sdev_gendev.type = &scsi_dev_type;
1601	scsi_enable_async_suspend(&sdev->sdev_gendev);
1602	dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1603		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1604	sdev->sdev_gendev.groups = hostt->sdev_groups;
1605
1606	device_initialize(&sdev->sdev_dev);
1607	sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1608	sdev->sdev_dev.class = &sdev_class;
1609	dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1610		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1611	/*
1612	 * Get a default scsi_level from the target (derived from sibling
1613	 * devices).  This is the best we can do for guessing how to set
1614	 * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1615	 * setting doesn't matter, because all the bits are zero anyway.
1616	 * But it does matter for higher LUNs.
1617	 */
1618	sdev->scsi_level = starget->scsi_level;
1619	if (sdev->scsi_level <= SCSI_2 &&
1620			sdev->scsi_level != SCSI_UNKNOWN &&
1621			!shost->no_scsi2_lun_in_cdb)
1622		sdev->lun_in_cdb = 1;
1623
1624	transport_setup_device(&sdev->sdev_gendev);
1625	spin_lock_irqsave(shost->host_lock, flags);
1626	list_add_tail(&sdev->same_target_siblings, &starget->devices);
1627	list_add_tail(&sdev->siblings, &shost->__devices);
1628	spin_unlock_irqrestore(shost->host_lock, flags);
1629	/*
1630	 * device can now only be removed via __scsi_remove_device() so hold
1631	 * the target.  Target will be held in CREATED state until something
1632	 * beneath it becomes visible (in which case it moves to RUNNING)
1633	 */
1634	kref_get(&starget->reap_ref);
1635}
1636
1637int scsi_is_sdev_device(const struct device *dev)
1638{
1639	return dev->type == &scsi_dev_type;
1640}
1641EXPORT_SYMBOL(scsi_is_sdev_device);
1642
1643/* A blank transport template that is used in drivers that don't
1644 * yet implement Transport Attributes */
1645struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };