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
30	static const struct device_type scsi_dev_type;
31
32	static 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
47	const 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
61	static 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	};
73	const 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
88	static 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
101	static 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
116	static 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
133	static 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(val: &channel, src: s1))
143	return -EINVAL;
144	if (check_set(val: &id, src: s2))
145	return -EINVAL;
146	if (check_set(val: &lun, src: 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) \
161	static ssize_t \
162	show_##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) \
175	static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
176
177	#define shost_rd_attr(field, format_string) \
178	shost_rd_attr2(field, field, format_string)
179
180	/*
181	* Create the actual show/store functions and data structures.
182	*/
183
184	static ssize_t
185	store_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, str: buf);
192	if (res == 0)
193	res = count;
194	return res;
195	};
196	static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
197
198	static ssize_t
199	store_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
222	static ssize_t
223	show_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(state: shost->shost_state);
227
228	if (!name)
229	return -EINVAL;
230
231	return snprintf(buf, size: 20, fmt: "%s\n", name);
232	}
233
234	/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
235	static struct device_attribute dev_attr_hstate =
236	__ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
237
238	static ssize_t
239	show_shost_mode(unsigned int mode, char *buf)
240	{
241	ssize_t len = 0;
242
243	if (mode & MODE_INITIATOR)
244	len = sprintf(buf, fmt: "%s", "Initiator");
245
246	if (mode & MODE_TARGET)
247	len += sprintf(buf: buf + len, fmt: "%s%s", len ? ", " : "", "Target");
248
249	len += sprintf(buf: buf + len, fmt: "\n");
250
251	return len;
252	}
253
254	static ssize_t
255	show_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(mode: supported_mode, buf);
266	}
267
268	static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
269
270	static ssize_t
271	show_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, size: 20, fmt: "unknown\n");
278	else
279	return show_shost_mode(mode: shost->active_mode, buf);
280	}
281
282	static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
283
284	static int check_reset_type(const char *str)
285	{
286	if (sysfs_streq(s1: str, s2: "adapter"))
287	return SCSI_ADAPTER_RESET;
288	else if (sysfs_streq(s1: str, s2: "firmware"))
289	return SCSI_FIRMWARE_RESET;
290	else
291	return 0;
292	}
293
294	static ssize_t
295	store_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(str: 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
312	exit_store_host_reset:
313	if (ret == 0)
314	ret = count;
315	return ret;
316	}
317
318	static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
319
320	static ssize_t
321	show_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, fmt: "off\n");
328	return sprintf(buf, fmt: "%u\n", shost->eh_deadline / HZ);
329	}
330
331	static ssize_t
332	store_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(s: buf, base: 10, res: &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(lock: shost->host_lock, flags);
366
367	return ret;
368	}
369
370	static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
371
372	shost_rd_attr(unique_id, "%u\n");
373	shost_rd_attr(cmd_per_lun, "%hd\n");
374	shost_rd_attr(can_queue, "%d\n");
375	shost_rd_attr(sg_tablesize, "%hu\n");
376	shost_rd_attr(sg_prot_tablesize, "%hu\n");
377	shost_rd_attr(prot_capabilities, "%u\n");
378	shost_rd_attr(prot_guard_type, "%hd\n");
379	shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
380
381	static ssize_t
382	show_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, size: 20, fmt: "%d\n", scsi_host_busy(shost));
386	}
387	static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
388
389	static ssize_t
390	show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
391	{
392	return sprintf(buf, fmt: "1\n");
393	}
394	static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
395
396	static ssize_t
397	show_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, size: 20, fmt: "%d\n", tag_set->nr_hw_queues);
403	}
404	static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
405
406	static 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
427	static const struct attribute_group scsi_shost_attr_group = {
428	.attrs = scsi_sysfs_shost_attrs,
429	};
430
431	const struct attribute_group *scsi_shost_groups[] = {
432	&scsi_shost_attr_group,
433	NULL
434	};
435
436	static 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(dev: &sdev->sdev_gendev);
442	}
443
444	static 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(entry: &sdev->siblings);
463	list_del(entry: &sdev->same_target_siblings);
464	list_del(entry: &sdev->starved_entry);
465	spin_unlock_irqrestore(lock: sdev->host->host_lock, flags);
466
467	cancel_work_sync(work: &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(entry: &evt->node);
474	kfree(objp: 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(sb: &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(lock: &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(objp: sdev->inquiry);
519	kfree(objp: sdev);
520
521	if (parent)
522	put_device(dev: parent);
523	}
524
525	static 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 */
531	static int scsi_bus_match(struct device *dev, 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
544	static 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, format: "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
554	return 0;
555	}
556
557	const 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
566	int scsi_sysfs_register(void)
567	{
568	int error;
569
570	error = bus_register(bus: &scsi_bus_type);
571	if (!error) {
572	error = class_register(class: &sdev_class);
573	if (error)
574	bus_unregister(bus: &scsi_bus_type);
575	}
576
577	return error;
578	}
579
580	void scsi_sysfs_unregister(void)
581	{
582	class_unregister(class: &sdev_class);
583	bus_unregister(bus: &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) \
591	static ssize_t \
592	sdev_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) \
606	static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
607
608
609	/*
610	* sdev_rw_attr: create a function and attribute variable for a
611	* read/write field.
612	*/
613	#define sdev_rw_attr(field, format_string) \
614	sdev_show_function(field, format_string) \
615	\
616	static ssize_t \
617	sdev_store_##field (struct device *dev, struct device_attribute *attr, \
618	const char *buf, size_t count) \
619	{ \
620	struct scsi_device *sdev; \
621	sdev = to_scsi_device(dev); \
622	sscanf (buf, format_string, &sdev->field); \
623	return count; \
624	} \
625	static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
626
627	/* Currently we don't export bit fields, but we might in future,
628	* so leave this code in */
629	#if 0
630	/*
631	* sdev_rd_attr: create a function and attribute variable for a
632	* read/write bit field.
633	*/
634	#define sdev_rw_attr_bit(field) \
635	sdev_show_function(field, "%d\n") \
636	\
637	static ssize_t \
638	sdev_store_##field (struct device *dev, struct device_attribute *attr, \
639	const char *buf, size_t count) \
640	{ \
641	int ret; \
642	struct scsi_device *sdev; \
643	ret = scsi_sdev_check_buf_bit(buf); \
644	if (ret >= 0) { \
645	sdev = to_scsi_device(dev); \
646	sdev->field = ret; \
647	ret = count; \
648	} \
649	return ret; \
650	} \
651	static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
652
653	/*
654	* scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
655	* else return -EINVAL.
656	*/
657	static int scsi_sdev_check_buf_bit(const char *buf)
658	{
659	if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
660	if (buf[0] == '1')
661	return 1;
662	else if (buf[0] == '0')
663	return 0;
664	else
665	return -EINVAL;
666	} else
667	return -EINVAL;
668	}
669	#endif
670	/*
671	* Create the actual show/store functions and data structures.
672	*/
673	sdev_rd_attr (type, "%d\n");
674	sdev_rd_attr (scsi_level, "%d\n");
675	sdev_rd_attr (vendor, "%.8s\n");
676	sdev_rd_attr (model, "%.16s\n");
677	sdev_rd_attr (rev, "%.4s\n");
678	sdev_rd_attr (cdl_supported, "%d\n");
679
680	static ssize_t
681	sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
682	char *buf)
683	{
684	struct scsi_device *sdev = to_scsi_device(dev);
685	return snprintf(buf, size: 20, fmt: "%d\n", scsi_device_busy(sdev));
686	}
687	static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
688
689	static ssize_t
690	sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
691	char *buf)
692	{
693	struct scsi_device *sdev = to_scsi_device(dev);
694	return snprintf(buf, size: 20, fmt: "%d\n", atomic_read(v: &sdev->device_blocked));
695	}
696	static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
697
698	/*
699	* TODO: can we make these symlinks to the block layer ones?
700	*/
701	static ssize_t
702	sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
703	{
704	struct scsi_device *sdev;
705	sdev = to_scsi_device(dev);
706	return snprintf(buf, size: 20, fmt: "%d\n", sdev->request_queue->rq_timeout / HZ);
707	}
708
709	static ssize_t
710	sdev_store_timeout (struct device *dev, struct device_attribute *attr,
711	const char *buf, size_t count)
712	{
713	struct scsi_device *sdev;
714	int timeout;
715	sdev = to_scsi_device(dev);
716	sscanf (buf, "%d\n", &timeout);
717	blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
718	return count;
719	}
720	static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
721
722	static ssize_t
723	sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
724	{
725	struct scsi_device *sdev;
726	sdev = to_scsi_device(dev);
727	return snprintf(buf, size: 20, fmt: "%u\n", sdev->eh_timeout / HZ);
728	}
729
730	static ssize_t
731	sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
732	const char *buf, size_t count)
733	{
734	struct scsi_device *sdev;
735	unsigned int eh_timeout;
736	int err;
737
738	if (!capable(CAP_SYS_ADMIN))
739	return -EACCES;
740
741	sdev = to_scsi_device(dev);
742	err = kstrtouint(s: buf, base: 10, res: &eh_timeout);
743	if (err)
744	return err;
745	sdev->eh_timeout = eh_timeout * HZ;
746
747	return count;
748	}
749	static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
750
751	static ssize_t
752	store_rescan_field (struct device *dev, struct device_attribute *attr,
753	const char *buf, size_t count)
754	{
755	scsi_rescan_device(to_scsi_device(dev));
756	return count;
757	}
758	static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
759
760	static ssize_t
761	sdev_store_delete(struct device *dev, struct device_attribute *attr,
762	const char *buf, size_t count)
763	{
764	struct kernfs_node *kn;
765	struct scsi_device *sdev = to_scsi_device(dev);
766
767	/*
768	* We need to try to get module, avoiding the module been removed
769	* during delete.
770	*/
771	if (scsi_device_get(sdev))
772	return -ENODEV;
773
774	kn = sysfs_break_active_protection(kobj: &dev->kobj, attr: &attr->attr);
775	WARN_ON_ONCE(!kn);
776	/*
777	* Concurrent writes into the "delete" sysfs attribute may trigger
778	* concurrent calls to device_remove_file() and scsi_remove_device().
779	* device_remove_file() handles concurrent removal calls by
780	* serializing these and by ignoring the second and later removal
781	* attempts. Concurrent calls of scsi_remove_device() are
782	* serialized. The second and later calls of scsi_remove_device() are
783	* ignored because the first call of that function changes the device
784	* state into SDEV_DEL.
785	*/
786	device_remove_file(dev, attr);
787	scsi_remove_device(sdev);
788	if (kn)
789	sysfs_unbreak_active_protection(kn);
790	scsi_device_put(sdev);
791	return count;
792	};
793	static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
794
795	static ssize_t
796	store_state_field(struct device *dev, struct device_attribute *attr,
797	const char *buf, size_t count)
798	{
799	int i, ret;
800	struct scsi_device *sdev = to_scsi_device(dev);
801	enum scsi_device_state state = 0;
802	bool rescan_dev = false;
803
804	for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
805	const int len = strlen(sdev_states[i].name);
806	if (strncmp(sdev_states[i].name, buf, len) == 0 &&
807	buf[len] == '\n') {
808	state = sdev_states[i].value;
809	break;
810	}
811	}
812	switch (state) {
813	case SDEV_RUNNING:
814	case SDEV_OFFLINE:
815	break;
816	default:
817	return -EINVAL;
818	}
819
820	mutex_lock(&sdev->state_mutex);
821	switch (sdev->sdev_state) {
822	case SDEV_RUNNING:
823	case SDEV_OFFLINE:
824	break;
825	default:
826	mutex_unlock(lock: &sdev->state_mutex);
827	return -EINVAL;
828	}
829	if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
830	ret = 0;
831	} else {
832	ret = scsi_device_set_state(sdev, state);
833	if (ret == 0 && state == SDEV_RUNNING)
834	rescan_dev = true;
835	}
836	mutex_unlock(lock: &sdev->state_mutex);
837
838	if (rescan_dev) {
839	/*
840	* If the device state changes to SDEV_RUNNING, we need to
841	* run the queue to avoid I/O hang, and rescan the device
842	* to revalidate it. Running the queue first is necessary
843	* because another thread may be waiting inside
844	* blk_mq_freeze_queue_wait() and because that call may be
845	* waiting for pending I/O to finish.
846	*/
847	blk_mq_run_hw_queues(q: sdev->request_queue, async: true);
848	scsi_rescan_device(sdev);
849	}
850
851	return ret == 0 ? count : -EINVAL;
852	}
853
854	static ssize_t
855	show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
856	{
857	struct scsi_device *sdev = to_scsi_device(dev);
858	const char *name = scsi_device_state_name(state: sdev->sdev_state);
859
860	if (!name)
861	return -EINVAL;
862
863	return snprintf(buf, size: 20, fmt: "%s\n", name);
864	}
865
866	static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
867
868	static ssize_t
869	show_queue_type_field(struct device *dev, struct device_attribute *attr,
870	char *buf)
871	{
872	struct scsi_device *sdev = to_scsi_device(dev);
873	const char *name = "none";
874
875	if (sdev->simple_tags)
876	name = "simple";
877
878	return snprintf(buf, size: 20, fmt: "%s\n", name);
879	}
880
881	static ssize_t
882	store_queue_type_field(struct device *dev, struct device_attribute *attr,
883	const char *buf, size_t count)
884	{
885	struct scsi_device *sdev = to_scsi_device(dev);
886
887	if (!sdev->tagged_supported)
888	return -EINVAL;
889
890	sdev_printk(KERN_INFO, sdev,
891	"ignoring write to deprecated queue_type attribute");
892	return count;
893	}
894
895	static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
896	store_queue_type_field);
897
898	#define sdev_vpd_pg_attr(_page) \
899	static ssize_t \
900	show_vpd_##_page(struct file *filp, struct kobject *kobj, \
901	struct bin_attribute *bin_attr, \
902	char *buf, loff_t off, size_t count) \
903	{ \
904	struct device *dev = kobj_to_dev(kobj); \
905	struct scsi_device *sdev = to_scsi_device(dev); \
906	struct scsi_vpd *vpd_page; \
907	int ret = -EINVAL; \
908	\
909	rcu_read_lock(); \
910	vpd_page = rcu_dereference(sdev->vpd_##_page); \
911	if (vpd_page) \
912	ret = memory_read_from_buffer(buf, count, &off, \
913	vpd_page->data, vpd_page->len); \
914	rcu_read_unlock(); \
915	return ret; \
916	} \
917	static struct bin_attribute dev_attr_vpd_##_page = { \
918	.attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
919	.size = 0, \
920	.read = show_vpd_##_page, \
921	};
922
923	sdev_vpd_pg_attr(pg83);
924	sdev_vpd_pg_attr(pg80);
925	sdev_vpd_pg_attr(pg89);
926	sdev_vpd_pg_attr(pgb0);
927	sdev_vpd_pg_attr(pgb1);
928	sdev_vpd_pg_attr(pgb2);
929	sdev_vpd_pg_attr(pgb7);
930	sdev_vpd_pg_attr(pg0);
931
932	static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
933	struct bin_attribute *bin_attr,
934	char *buf, loff_t off, size_t count)
935	{
936	struct device *dev = kobj_to_dev(kobj);
937	struct scsi_device *sdev = to_scsi_device(dev);
938
939	if (!sdev->inquiry)
940	return -EINVAL;
941
942	return memory_read_from_buffer(to: buf, count, ppos: &off, from: sdev->inquiry,
943	available: sdev->inquiry_len);
944	}
945
946	static struct bin_attribute dev_attr_inquiry = {
947	.attr = {
948	.name = "inquiry",
949	.mode = S_IRUGO,
950	},
951	.size = 0,
952	.read = show_inquiry,
953	};
954
955	static ssize_t
956	show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
957	char *buf)
958	{
959	return snprintf(buf, size: 20, fmt: "%d\n", (int)sizeof(atomic_t) * 8);
960	}
961
962	static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
963
964	#define show_sdev_iostat(field) \
965	static ssize_t \
966	show_iostat_##field(struct device *dev, struct device_attribute *attr, \
967	char *buf) \
968	{ \
969	struct scsi_device *sdev = to_scsi_device(dev); \
970	unsigned long long count = atomic_read(&sdev->field); \
971	return snprintf(buf, 20, "0x%llx\n", count); \
972	} \
973	static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
974
975	show_sdev_iostat(iorequest_cnt);
976	show_sdev_iostat(iodone_cnt);
977	show_sdev_iostat(ioerr_cnt);
978	show_sdev_iostat(iotmo_cnt);
979
980	static ssize_t
981	sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
982	{
983	struct scsi_device *sdev;
984	sdev = to_scsi_device(dev);
985	return snprintf (buf, size: 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
986	}
987	static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
988
989	#define DECLARE_EVT_SHOW(name, Cap_name) \
990	static ssize_t \
991	sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
992	char *buf) \
993	{ \
994	struct scsi_device *sdev = to_scsi_device(dev); \
995	int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
996	return snprintf(buf, 20, "%d\n", val); \
997	}
998
999	#define DECLARE_EVT_STORE(name, Cap_name) \
1000	static ssize_t \
1001	sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
1002	const char *buf, size_t count) \
1003	{ \
1004	struct scsi_device *sdev = to_scsi_device(dev); \
1005	int val = simple_strtoul(buf, NULL, 0); \
1006	if (val == 0) \
1007	clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1008	else if (val == 1) \
1009	set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1010	else \
1011	return -EINVAL; \
1012	return count; \
1013	}
1014
1015	#define DECLARE_EVT(name, Cap_name) \
1016	DECLARE_EVT_SHOW(name, Cap_name) \
1017	DECLARE_EVT_STORE(name, Cap_name) \
1018	static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
1019	sdev_store_evt_##name);
1020	#define REF_EVT(name) &dev_attr_evt_##name.attr
1021
1022	DECLARE_EVT(media_change, MEDIA_CHANGE)
1023	DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1024	DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1025	DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1026	DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1027	DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1028
1029	static ssize_t
1030	sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1031	const char *buf, size_t count)
1032	{
1033	int depth, retval;
1034	struct scsi_device *sdev = to_scsi_device(dev);
1035	const struct scsi_host_template *sht = sdev->host->hostt;
1036
1037	if (!sht->change_queue_depth)
1038	return -EINVAL;
1039
1040	depth = simple_strtoul(buf, NULL, 0);
1041
1042	if (depth < 1 || depth > sdev->host->can_queue)
1043	return -EINVAL;
1044
1045	retval = sht->change_queue_depth(sdev, depth);
1046	if (retval < 0)
1047	return retval;
1048
1049	sdev->max_queue_depth = sdev->queue_depth;
1050
1051	return count;
1052	}
1053	sdev_show_function(queue_depth, "%d\n");
1054
1055	static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1056	sdev_store_queue_depth);
1057
1058	static ssize_t
1059	sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1060	char *buf)
1061	{
1062	struct scsi_device *sdev = to_scsi_device(dev);
1063	ssize_t count;
1064
1065	count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1066	if (count > 0) {
1067	buf[count] = '\n';
1068	count++;
1069	}
1070	return count;
1071	}
1072	static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1073
1074	#define BLIST_FLAG_NAME(name) \
1075	[const_ilog2((__force __u64)BLIST_##name)] = #name
1076	static const char *const sdev_bflags_name[] = {
1077	#include "scsi_devinfo_tbl.c"
1078	};
1079	#undef BLIST_FLAG_NAME
1080
1081	static ssize_t
1082	sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1083	char *buf)
1084	{
1085	struct scsi_device *sdev = to_scsi_device(dev);
1086	int i;
1087	ssize_t len = 0;
1088
1089	for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1090	const char *name = NULL;
1091
1092	if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1093	continue;
1094	if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1095	name = sdev_bflags_name[i];
1096
1097	if (name)
1098	len += scnprintf(buf: buf + len, PAGE_SIZE - len,
1099	fmt: "%s%s", len ? " " : "", name);
1100	else
1101	len += scnprintf(buf: buf + len, PAGE_SIZE - len,
1102	fmt: "%sINVALID_BIT(%d)", len ? " " : "", i);
1103	}
1104	if (len)
1105	len += scnprintf(buf: buf + len, PAGE_SIZE - len, fmt: "\n");
1106	return len;
1107	}
1108	static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1109
1110	#ifdef CONFIG_SCSI_DH
1111	static ssize_t
1112	sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1113	char *buf)
1114	{
1115	struct scsi_device *sdev = to_scsi_device(dev);
1116
1117	if (!sdev->handler)
1118	return snprintf(buf, size: 20, fmt: "detached\n");
1119
1120	return snprintf(buf, size: 20, fmt: "%s\n", sdev->handler->name);
1121	}
1122
1123	static ssize_t
1124	sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1125	const char *buf, size_t count)
1126	{
1127	struct scsi_device *sdev = to_scsi_device(dev);
1128	int err = -EINVAL;
1129
1130	if (sdev->sdev_state == SDEV_CANCEL ||
1131	sdev->sdev_state == SDEV_DEL)
1132	return -ENODEV;
1133
1134	if (!sdev->handler) {
1135	/*
1136	* Attach to a device handler
1137	*/
1138	err = scsi_dh_attach(sdev->request_queue, buf);
1139	} else if (!strncmp(buf, "activate", 8)) {
1140	/*
1141	* Activate a device handler
1142	*/
1143	if (sdev->handler->activate)
1144	err = sdev->handler->activate(sdev, NULL, NULL);
1145	else
1146	err = 0;
1147	} else if (!strncmp(buf, "detach", 6)) {
1148	/*
1149	* Detach from a device handler
1150	*/
1151	sdev_printk(KERN_WARNING, sdev,
1152	"can't detach handler %s.\n",
1153	sdev->handler->name);
1154	err = -EINVAL;
1155	}
1156
1157	return err < 0 ? err : count;
1158	}
1159
1160	static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1161	sdev_store_dh_state);
1162
1163	static ssize_t
1164	sdev_show_access_state(struct device *dev,
1165	struct device_attribute *attr,
1166	char *buf)
1167	{
1168	struct scsi_device *sdev = to_scsi_device(dev);
1169	unsigned char access_state;
1170	const char *access_state_name;
1171
1172	if (!sdev->handler)
1173	return -EINVAL;
1174
1175	access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1176	access_state_name = scsi_access_state_name(state: access_state);
1177
1178	return sprintf(buf, fmt: "%s\n",
1179	access_state_name ? access_state_name : "unknown");
1180	}
1181	static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1182
1183	static ssize_t
1184	sdev_show_preferred_path(struct device *dev,
1185	struct device_attribute *attr,
1186	char *buf)
1187	{
1188	struct scsi_device *sdev = to_scsi_device(dev);
1189
1190	if (!sdev->handler)
1191	return -EINVAL;
1192
1193	if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1194	return sprintf(buf, fmt: "1\n");
1195	else
1196	return sprintf(buf, fmt: "0\n");
1197	}
1198	static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1199	#endif
1200
1201	static ssize_t
1202	sdev_show_queue_ramp_up_period(struct device *dev,
1203	struct device_attribute *attr,
1204	char *buf)
1205	{
1206	struct scsi_device *sdev;
1207	sdev = to_scsi_device(dev);
1208	return snprintf(buf, size: 20, fmt: "%u\n",
1209	jiffies_to_msecs(j: sdev->queue_ramp_up_period));
1210	}
1211
1212	static ssize_t
1213	sdev_store_queue_ramp_up_period(struct device *dev,
1214	struct device_attribute *attr,
1215	const char *buf, size_t count)
1216	{
1217	struct scsi_device *sdev = to_scsi_device(dev);
1218	unsigned int period;
1219
1220	if (kstrtouint(s: buf, base: 10, res: &period))
1221	return -EINVAL;
1222
1223	sdev->queue_ramp_up_period = msecs_to_jiffies(m: period);
1224	return count;
1225	}
1226
1227	static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1228	sdev_show_queue_ramp_up_period,
1229	sdev_store_queue_ramp_up_period);
1230
1231	static ssize_t sdev_show_cdl_enable(struct device *dev,
1232	struct device_attribute *attr, char *buf)
1233	{
1234	struct scsi_device *sdev = to_scsi_device(dev);
1235
1236	return sysfs_emit(buf, fmt: "%d\n", (int)sdev->cdl_enable);
1237	}
1238
1239	static ssize_t sdev_store_cdl_enable(struct device *dev,
1240	struct device_attribute *attr,
1241	const char *buf, size_t count)
1242	{
1243	int ret;
1244	bool v;
1245
1246	if (kstrtobool(s: buf, res: &v))
1247	return -EINVAL;
1248
1249	ret = scsi_cdl_enable(to_scsi_device(dev), enable: v);
1250	if (ret)
1251	return ret;
1252
1253	return count;
1254	}
1255	static DEVICE_ATTR(cdl_enable, S_IRUGO | S_IWUSR,
1256	sdev_show_cdl_enable, sdev_store_cdl_enable);
1257
1258	static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1259	struct attribute *attr, int i)
1260	{
1261	struct device *dev = kobj_to_dev(kobj);
1262	struct scsi_device *sdev = to_scsi_device(dev);
1263
1264
1265	if (attr == &dev_attr_queue_depth.attr &&
1266	!sdev->host->hostt->change_queue_depth)
1267	return S_IRUGO;
1268
1269	if (attr == &dev_attr_queue_ramp_up_period.attr &&
1270	!sdev->host->hostt->change_queue_depth)
1271	return 0;
1272
1273	return attr->mode;
1274	}
1275
1276	static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1277	struct bin_attribute *attr, int i)
1278	{
1279	struct device *dev = kobj_to_dev(kobj);
1280	struct scsi_device *sdev = to_scsi_device(dev);
1281
1282
1283	if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1284	return 0;
1285
1286	if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1287	return 0;
1288
1289	if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1290	return 0;
1291
1292	if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1293	return 0;
1294
1295	if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1296	return 0;
1297
1298	if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1299	return 0;
1300
1301	if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1302	return 0;
1303
1304	if (attr == &dev_attr_vpd_pgb7 && !sdev->vpd_pgb7)
1305	return 0;
1306
1307	return S_IRUGO;
1308	}
1309
1310	/* Default template for device attributes. May NOT be modified */
1311	static struct attribute *scsi_sdev_attrs[] = {
1312	&dev_attr_device_blocked.attr,
1313	&dev_attr_type.attr,
1314	&dev_attr_scsi_level.attr,
1315	&dev_attr_device_busy.attr,
1316	&dev_attr_vendor.attr,
1317	&dev_attr_model.attr,
1318	&dev_attr_rev.attr,
1319	&dev_attr_rescan.attr,
1320	&dev_attr_delete.attr,
1321	&dev_attr_state.attr,
1322	&dev_attr_timeout.attr,
1323	&dev_attr_eh_timeout.attr,
1324	&dev_attr_iocounterbits.attr,
1325	&dev_attr_iorequest_cnt.attr,
1326	&dev_attr_iodone_cnt.attr,
1327	&dev_attr_ioerr_cnt.attr,
1328	&dev_attr_iotmo_cnt.attr,
1329	&dev_attr_modalias.attr,
1330	&dev_attr_queue_depth.attr,
1331	&dev_attr_queue_type.attr,
1332	&dev_attr_wwid.attr,
1333	&dev_attr_blacklist.attr,
1334	#ifdef CONFIG_SCSI_DH
1335	&dev_attr_dh_state.attr,
1336	&dev_attr_access_state.attr,
1337	&dev_attr_preferred_path.attr,
1338	#endif
1339	&dev_attr_queue_ramp_up_period.attr,
1340	&dev_attr_cdl_supported.attr,
1341	&dev_attr_cdl_enable.attr,
1342	REF_EVT(media_change),
1343	REF_EVT(inquiry_change_reported),
1344	REF_EVT(capacity_change_reported),
1345	REF_EVT(soft_threshold_reached),
1346	REF_EVT(mode_parameter_change_reported),
1347	REF_EVT(lun_change_reported),
1348	NULL
1349	};
1350
1351	static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1352	&dev_attr_vpd_pg0,
1353	&dev_attr_vpd_pg83,
1354	&dev_attr_vpd_pg80,
1355	&dev_attr_vpd_pg89,
1356	&dev_attr_vpd_pgb0,
1357	&dev_attr_vpd_pgb1,
1358	&dev_attr_vpd_pgb2,
1359	&dev_attr_vpd_pgb7,
1360	&dev_attr_inquiry,
1361	NULL
1362	};
1363	static struct attribute_group scsi_sdev_attr_group = {
1364	.attrs = scsi_sdev_attrs,
1365	.bin_attrs = scsi_sdev_bin_attrs,
1366	.is_visible = scsi_sdev_attr_is_visible,
1367	.is_bin_visible = scsi_sdev_bin_attr_is_visible,
1368	};
1369
1370	static const struct attribute_group *scsi_sdev_attr_groups[] = {
1371	&scsi_sdev_attr_group,
1372	NULL
1373	};
1374
1375	static int scsi_target_add(struct scsi_target *starget)
1376	{
1377	int error;
1378
1379	if (starget->state != STARGET_CREATED)
1380	return 0;
1381
1382	error = device_add(dev: &starget->dev);
1383	if (error) {
1384	dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1385	return error;
1386	}
1387	transport_add_device(&starget->dev);
1388	starget->state = STARGET_RUNNING;
1389
1390	pm_runtime_set_active(dev: &starget->dev);
1391	pm_runtime_enable(dev: &starget->dev);
1392	device_enable_async_suspend(dev: &starget->dev);
1393
1394	return 0;
1395	}
1396
1397	/**
1398	* scsi_sysfs_add_sdev - add scsi device to sysfs
1399	* @sdev: scsi_device to add
1400	*
1401	* Return value:
1402	* 0 on Success / non-zero on Failure
1403	**/
1404	int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1405	{
1406	int error;
1407	struct scsi_target *starget = sdev->sdev_target;
1408
1409	error = scsi_target_add(starget);
1410	if (error)
1411	return error;
1412
1413	transport_configure_device(&starget->dev);
1414
1415	device_enable_async_suspend(dev: &sdev->sdev_gendev);
1416	scsi_autopm_get_target(starget);
1417	pm_runtime_set_active(dev: &sdev->sdev_gendev);
1418	if (!sdev->rpm_autosuspend)
1419	pm_runtime_forbid(dev: &sdev->sdev_gendev);
1420	pm_runtime_enable(dev: &sdev->sdev_gendev);
1421	scsi_autopm_put_target(starget);
1422
1423	scsi_autopm_get_device(sdev);
1424
1425	scsi_dh_add_device(sdev);
1426
1427	error = device_add(dev: &sdev->sdev_gendev);
1428	if (error) {
1429	sdev_printk(KERN_INFO, sdev,
1430	"failed to add device: %d\n", error);
1431	return error;
1432	}
1433
1434	device_enable_async_suspend(dev: &sdev->sdev_dev);
1435	error = device_add(dev: &sdev->sdev_dev);
1436	if (error) {
1437	sdev_printk(KERN_INFO, sdev,
1438	"failed to add class device: %d\n", error);
1439	device_del(dev: &sdev->sdev_gendev);
1440	return error;
1441	}
1442	transport_add_device(&sdev->sdev_gendev);
1443	sdev->is_visible = 1;
1444
1445	if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1446	sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1447	if (IS_ERR(ptr: sdev->bsg_dev)) {
1448	error = PTR_ERR(ptr: sdev->bsg_dev);
1449	sdev_printk(KERN_INFO, sdev,
1450	"Failed to register bsg queue, errno=%d\n",
1451	error);
1452	sdev->bsg_dev = NULL;
1453	}
1454	}
1455
1456	scsi_autopm_put_device(sdev);
1457	return error;
1458	}
1459
1460	void __scsi_remove_device(struct scsi_device *sdev)
1461	{
1462	struct device *dev = &sdev->sdev_gendev;
1463	int res;
1464
1465	/*
1466	* This cleanup path is not reentrant and while it is impossible
1467	* to get a new reference with scsi_device_get() someone can still
1468	* hold a previously acquired one.
1469	*/
1470	if (sdev->sdev_state == SDEV_DEL)
1471	return;
1472
1473	if (sdev->is_visible) {
1474	/*
1475	* If scsi_internal_target_block() is running concurrently,
1476	* wait until it has finished before changing the device state.
1477	*/
1478	mutex_lock(&sdev->state_mutex);
1479	/*
1480	* If blocked, we go straight to DEL and restart the queue so
1481	* any commands issued during driver shutdown (like sync
1482	* cache) are errored immediately.
1483	*/
1484	res = scsi_device_set_state(sdev, state: SDEV_CANCEL);
1485	if (res != 0) {
1486	res = scsi_device_set_state(sdev, state: SDEV_DEL);
1487	if (res == 0)
1488	scsi_start_queue(sdev);
1489	}
1490	mutex_unlock(lock: &sdev->state_mutex);
1491
1492	if (res != 0)
1493	return;
1494
1495	if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1496	bsg_unregister_queue(bcd: sdev->bsg_dev);
1497	device_unregister(dev: &sdev->sdev_dev);
1498	transport_remove_device(dev);
1499	device_del(dev);
1500	} else
1501	put_device(dev: &sdev->sdev_dev);
1502
1503	/*
1504	* Stop accepting new requests and wait until all queuecommand() and
1505	* scsi_run_queue() invocations have finished before tearing down the
1506	* device.
1507	*/
1508	mutex_lock(&sdev->state_mutex);
1509	scsi_device_set_state(sdev, state: SDEV_DEL);
1510	mutex_unlock(lock: &sdev->state_mutex);
1511
1512	blk_mq_destroy_queue(sdev->request_queue);
1513	kref_put(kref: &sdev->host->tagset_refcnt, release: scsi_mq_free_tags);
1514	cancel_work_sync(work: &sdev->requeue_work);
1515
1516	if (sdev->host->hostt->slave_destroy)
1517	sdev->host->hostt->slave_destroy(sdev);
1518	transport_destroy_device(dev);
1519
1520	/*
1521	* Paired with the kref_get() in scsi_sysfs_initialize(). We have
1522	* removed sysfs visibility from the device, so make the target
1523	* invisible if this was the last device underneath it.
1524	*/
1525	scsi_target_reap(scsi_target(sdev));
1526
1527	put_device(dev);
1528	}
1529
1530	/**
1531	* scsi_remove_device - unregister a device from the scsi bus
1532	* @sdev: scsi_device to unregister
1533	**/
1534	void scsi_remove_device(struct scsi_device *sdev)
1535	{
1536	struct Scsi_Host *shost = sdev->host;
1537
1538	mutex_lock(&shost->scan_mutex);
1539	__scsi_remove_device(sdev);
1540	mutex_unlock(lock: &shost->scan_mutex);
1541	}
1542	EXPORT_SYMBOL(scsi_remove_device);
1543
1544	static void __scsi_remove_target(struct scsi_target *starget)
1545	{
1546	struct Scsi_Host *shost = dev_to_shost(dev: starget->dev.parent);
1547	unsigned long flags;
1548	struct scsi_device *sdev;
1549
1550	spin_lock_irqsave(shost->host_lock, flags);
1551	restart:
1552	list_for_each_entry(sdev, &shost->__devices, siblings) {
1553	/*
1554	* We cannot call scsi_device_get() here, as
1555	* we might've been called from rmmod() causing
1556	* scsi_device_get() to fail the module_is_live()
1557	* check.
1558	*/
1559	if (sdev->channel != starget->channel ||
1560	sdev->id != starget->id)
1561	continue;
1562	if (sdev->sdev_state == SDEV_DEL ||
1563	sdev->sdev_state == SDEV_CANCEL ||
1564	!get_device(dev: &sdev->sdev_gendev))
1565	continue;
1566	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1567	scsi_remove_device(sdev);
1568	put_device(dev: &sdev->sdev_gendev);
1569	spin_lock_irqsave(shost->host_lock, flags);
1570	goto restart;
1571	}
1572	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1573	}
1574
1575	/**
1576	* scsi_remove_target - try to remove a target and all its devices
1577	* @dev: generic starget or parent of generic stargets to be removed
1578	*
1579	* Note: This is slightly racy. It is possible that if the user
1580	* requests the addition of another device then the target won't be
1581	* removed.
1582	*/
1583	void scsi_remove_target(struct device *dev)
1584	{
1585	struct Scsi_Host *shost = dev_to_shost(dev: dev->parent);
1586	struct scsi_target *starget;
1587	unsigned long flags;
1588
1589	restart:
1590	spin_lock_irqsave(shost->host_lock, flags);
1591	list_for_each_entry(starget, &shost->__targets, siblings) {
1592	if (starget->state == STARGET_DEL ||
1593	starget->state == STARGET_REMOVE ||
1594	starget->state == STARGET_CREATED_REMOVE)
1595	continue;
1596	if (starget->dev.parent == dev || &starget->dev == dev) {
1597	kref_get(kref: &starget->reap_ref);
1598	if (starget->state == STARGET_CREATED)
1599	starget->state = STARGET_CREATED_REMOVE;
1600	else
1601	starget->state = STARGET_REMOVE;
1602	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1603	__scsi_remove_target(starget);
1604	scsi_target_reap(starget);
1605	goto restart;
1606	}
1607	}
1608	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1609	}
1610	EXPORT_SYMBOL(scsi_remove_target);
1611
1612	int scsi_register_driver(struct device_driver *drv)
1613	{
1614	drv->bus = &scsi_bus_type;
1615
1616	return driver_register(drv);
1617	}
1618	EXPORT_SYMBOL(scsi_register_driver);
1619
1620	int scsi_register_interface(struct class_interface *intf)
1621	{
1622	intf->class = &sdev_class;
1623
1624	return class_interface_register(intf);
1625	}
1626	EXPORT_SYMBOL(scsi_register_interface);
1627
1628	/**
1629	* scsi_sysfs_add_host - add scsi host to subsystem
1630	* @shost: scsi host struct to add to subsystem
1631	**/
1632	int scsi_sysfs_add_host(struct Scsi_Host *shost)
1633	{
1634	transport_register_device(dev: &shost->shost_gendev);
1635	transport_configure_device(&shost->shost_gendev);
1636	return 0;
1637	}
1638
1639	static const struct device_type scsi_dev_type = {
1640	.name = "scsi_device",
1641	.release = scsi_device_dev_release,
1642	.groups = scsi_sdev_attr_groups,
1643	};
1644
1645	void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1646	{
1647	unsigned long flags;
1648	struct Scsi_Host *shost = sdev->host;
1649	const struct scsi_host_template *hostt = shost->hostt;
1650	struct scsi_target *starget = sdev->sdev_target;
1651
1652	device_initialize(dev: &sdev->sdev_gendev);
1653	sdev->sdev_gendev.bus = &scsi_bus_type;
1654	sdev->sdev_gendev.type = &scsi_dev_type;
1655	scsi_enable_async_suspend(dev: &sdev->sdev_gendev);
1656	dev_set_name(dev: &sdev->sdev_gendev, name: "%d:%d:%d:%llu",
1657	sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1658	sdev->sdev_gendev.groups = hostt->sdev_groups;
1659
1660	device_initialize(dev: &sdev->sdev_dev);
1661	sdev->sdev_dev.parent = get_device(dev: &sdev->sdev_gendev);
1662	sdev->sdev_dev.class = &sdev_class;
1663	dev_set_name(dev: &sdev->sdev_dev, name: "%d:%d:%d:%llu",
1664	sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1665	/*
1666	* Get a default scsi_level from the target (derived from sibling
1667	* devices). This is the best we can do for guessing how to set
1668	* sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
1669	* setting doesn't matter, because all the bits are zero anyway.
1670	* But it does matter for higher LUNs.
1671	*/
1672	sdev->scsi_level = starget->scsi_level;
1673	if (sdev->scsi_level <= SCSI_2 &&
1674	sdev->scsi_level != SCSI_UNKNOWN &&
1675	!shost->no_scsi2_lun_in_cdb)
1676	sdev->lun_in_cdb = 1;
1677
1678	transport_setup_device(&sdev->sdev_gendev);
1679	spin_lock_irqsave(shost->host_lock, flags);
1680	list_add_tail(new: &sdev->same_target_siblings, head: &starget->devices);
1681	list_add_tail(new: &sdev->siblings, head: &shost->__devices);
1682	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1683	/*
1684	* device can now only be removed via __scsi_remove_device() so hold
1685	* the target. Target will be held in CREATED state until something
1686	* beneath it becomes visible (in which case it moves to RUNNING)
1687	*/
1688	kref_get(kref: &starget->reap_ref);
1689	}
1690
1691	int scsi_is_sdev_device(const struct device *dev)
1692	{
1693	return dev->type == &scsi_dev_type;
1694	}
1695	EXPORT_SYMBOL(scsi_is_sdev_device);
1696
1697	/* A blank transport template that is used in drivers that don't
1698	* yet implement Transport Attributes */
1699	struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
1700