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 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 
scsi_device_state_name(enum scsi_device_state state)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 };
scsi_host_state_name(enum scsi_host_state state)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 
scsi_access_state_name(unsigned char state)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 
check_set(unsigned long long * val,char * src)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 
scsi_scan(struct Scsi_Host * shost,const char * str)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(&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)			\
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
store_scan(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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, 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
store_shost_state(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
show_shost_state(struct device * dev,struct device_attribute * attr,char * buf)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(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 */
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
show_shost_mode(unsigned int mode,char * buf)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, "%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 
254 static ssize_t
show_shost_supported_mode(struct device * dev,struct device_attribute * attr,char * buf)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(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
show_shost_active_mode(struct device * dev,struct device_attribute * attr,char * buf)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, 20, "unknown\n");
278 	else
279 		return show_shost_mode(shost->active_mode, buf);
280 }
281 
282 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
283 
check_reset_type(const char * str)284 static 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 
294 static ssize_t
store_host_reset(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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(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
show_shost_eh_deadline(struct device * dev,struct device_attribute * attr,char * buf)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, "off\n");
328 	return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
329 }
330 
331 static ssize_t
store_shost_eh_deadline(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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(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 
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
show_host_busy(struct device * dev,struct device_attribute * attr,char * buf)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, 20, "%d\n", scsi_host_busy(shost));
386 }
387 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
388 
389 static ssize_t
show_use_blk_mq(struct device * dev,struct device_attribute * attr,char * buf)390 show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
391 {
392 	return sprintf(buf, "1\n");
393 }
394 static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
395 
396 static ssize_t
show_nr_hw_queues(struct device * dev,struct device_attribute * attr,char * buf)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, 20, "%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 
scsi_device_cls_release(struct device * class_dev)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(&sdev->sdev_gendev);
442 }
443 
scsi_device_dev_release(struct device * dev)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 	unsigned long flags;
453 
454 	might_sleep();
455 
456 	scsi_dh_release_device(sdev);
457 
458 	parent = sdev->sdev_gendev.parent;
459 
460 	spin_lock_irqsave(sdev->host->host_lock, flags);
461 	list_del(&sdev->siblings);
462 	list_del(&sdev->same_target_siblings);
463 	list_del(&sdev->starved_entry);
464 	spin_unlock_irqrestore(sdev->host->host_lock, flags);
465 
466 	cancel_work_sync(&sdev->event_work);
467 
468 	list_for_each_safe(this, tmp, &sdev->event_list) {
469 		struct scsi_event *evt;
470 
471 		evt = list_entry(this, struct scsi_event, node);
472 		list_del(&evt->node);
473 		kfree(evt);
474 	}
475 
476 	blk_put_queue(sdev->request_queue);
477 	/* NULL queue means the device can't be used */
478 	sdev->request_queue = NULL;
479 
480 	sbitmap_free(&sdev->budget_map);
481 
482 	mutex_lock(&sdev->inquiry_mutex);
483 	vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
484 				       lockdep_is_held(&sdev->inquiry_mutex));
485 	vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
486 				       lockdep_is_held(&sdev->inquiry_mutex));
487 	vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
488 				       lockdep_is_held(&sdev->inquiry_mutex));
489 	vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
490 				       lockdep_is_held(&sdev->inquiry_mutex));
491 	vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
492 				       lockdep_is_held(&sdev->inquiry_mutex));
493 	vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
494 				       lockdep_is_held(&sdev->inquiry_mutex));
495 	vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
496 				       lockdep_is_held(&sdev->inquiry_mutex));
497 	mutex_unlock(&sdev->inquiry_mutex);
498 
499 	if (vpd_pg0)
500 		kfree_rcu(vpd_pg0, rcu);
501 	if (vpd_pg83)
502 		kfree_rcu(vpd_pg83, rcu);
503 	if (vpd_pg80)
504 		kfree_rcu(vpd_pg80, rcu);
505 	if (vpd_pg89)
506 		kfree_rcu(vpd_pg89, rcu);
507 	if (vpd_pgb0)
508 		kfree_rcu(vpd_pgb0, rcu);
509 	if (vpd_pgb1)
510 		kfree_rcu(vpd_pgb1, rcu);
511 	if (vpd_pgb2)
512 		kfree_rcu(vpd_pgb2, rcu);
513 	kfree(sdev->inquiry);
514 	kfree(sdev);
515 
516 	if (parent)
517 		put_device(parent);
518 }
519 
520 static struct class sdev_class = {
521 	.name		= "scsi_device",
522 	.dev_release	= scsi_device_cls_release,
523 };
524 
525 /* all probing is done in the individual ->probe routines */
scsi_bus_match(struct device * dev,struct device_driver * gendrv)526 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
527 {
528 	struct scsi_device *sdp;
529 
530 	if (dev->type != &scsi_dev_type)
531 		return 0;
532 
533 	sdp = to_scsi_device(dev);
534 	if (sdp->no_uld_attach)
535 		return 0;
536 	return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
537 }
538 
scsi_bus_uevent(const struct device * dev,struct kobj_uevent_env * env)539 static int scsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
540 {
541 	const struct scsi_device *sdev;
542 
543 	if (dev->type != &scsi_dev_type)
544 		return 0;
545 
546 	sdev = to_scsi_device(dev);
547 
548 	add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
549 	return 0;
550 }
551 
552 struct bus_type scsi_bus_type = {
553         .name		= "scsi",
554         .match		= scsi_bus_match,
555 	.uevent		= scsi_bus_uevent,
556 #ifdef CONFIG_PM
557 	.pm		= &scsi_bus_pm_ops,
558 #endif
559 };
560 
scsi_sysfs_register(void)561 int scsi_sysfs_register(void)
562 {
563 	int error;
564 
565 	error = bus_register(&scsi_bus_type);
566 	if (!error) {
567 		error = class_register(&sdev_class);
568 		if (error)
569 			bus_unregister(&scsi_bus_type);
570 	}
571 
572 	return error;
573 }
574 
scsi_sysfs_unregister(void)575 void scsi_sysfs_unregister(void)
576 {
577 	class_unregister(&sdev_class);
578 	bus_unregister(&scsi_bus_type);
579 }
580 
581 /*
582  * sdev_show_function: macro to create an attr function that can be used to
583  * show a non-bit field.
584  */
585 #define sdev_show_function(field, format_string)				\
586 static ssize_t								\
587 sdev_show_##field (struct device *dev, struct device_attribute *attr,	\
588 		   char *buf)						\
589 {									\
590 	struct scsi_device *sdev;					\
591 	sdev = to_scsi_device(dev);					\
592 	return snprintf (buf, 20, format_string, sdev->field);		\
593 }									\
594 
595 /*
596  * sdev_rd_attr: macro to create a function and attribute variable for a
597  * read only field.
598  */
599 #define sdev_rd_attr(field, format_string)				\
600 	sdev_show_function(field, format_string)			\
601 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
602 
603 
604 /*
605  * sdev_rw_attr: create a function and attribute variable for a
606  * read/write field.
607  */
608 #define sdev_rw_attr(field, format_string)				\
609 	sdev_show_function(field, format_string)				\
610 									\
611 static ssize_t								\
612 sdev_store_##field (struct device *dev, struct device_attribute *attr,	\
613 		    const char *buf, size_t count)			\
614 {									\
615 	struct scsi_device *sdev;					\
616 	sdev = to_scsi_device(dev);					\
617 	sscanf (buf, format_string, &sdev->field);			\
618 	return count;							\
619 }									\
620 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
621 
622 /* Currently we don't export bit fields, but we might in future,
623  * so leave this code in */
624 #if 0
625 /*
626  * sdev_rd_attr: create a function and attribute variable for a
627  * read/write bit field.
628  */
629 #define sdev_rw_attr_bit(field)						\
630 	sdev_show_function(field, "%d\n")					\
631 									\
632 static ssize_t								\
633 sdev_store_##field (struct device *dev, struct device_attribute *attr,	\
634 		    const char *buf, size_t count)			\
635 {									\
636 	int ret;							\
637 	struct scsi_device *sdev;					\
638 	ret = scsi_sdev_check_buf_bit(buf);				\
639 	if (ret >= 0)	{						\
640 		sdev = to_scsi_device(dev);				\
641 		sdev->field = ret;					\
642 		ret = count;						\
643 	}								\
644 	return ret;							\
645 }									\
646 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
647 
648 /*
649  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
650  * else return -EINVAL.
651  */
652 static int scsi_sdev_check_buf_bit(const char *buf)
653 {
654 	if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
655 		if (buf[0] == '1')
656 			return 1;
657 		else if (buf[0] == '0')
658 			return 0;
659 		else
660 			return -EINVAL;
661 	} else
662 		return -EINVAL;
663 }
664 #endif
665 /*
666  * Create the actual show/store functions and data structures.
667  */
668 sdev_rd_attr (type, "%d\n");
669 sdev_rd_attr (scsi_level, "%d\n");
670 sdev_rd_attr (vendor, "%.8s\n");
671 sdev_rd_attr (model, "%.16s\n");
672 sdev_rd_attr (rev, "%.4s\n");
673 sdev_rd_attr (cdl_supported, "%d\n");
674 
675 static ssize_t
sdev_show_device_busy(struct device * dev,struct device_attribute * attr,char * buf)676 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
677 		char *buf)
678 {
679 	struct scsi_device *sdev = to_scsi_device(dev);
680 	return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
681 }
682 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
683 
684 static ssize_t
sdev_show_device_blocked(struct device * dev,struct device_attribute * attr,char * buf)685 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
686 		char *buf)
687 {
688 	struct scsi_device *sdev = to_scsi_device(dev);
689 	return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
690 }
691 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
692 
693 /*
694  * TODO: can we make these symlinks to the block layer ones?
695  */
696 static ssize_t
sdev_show_timeout(struct device * dev,struct device_attribute * attr,char * buf)697 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
698 {
699 	struct scsi_device *sdev;
700 	sdev = to_scsi_device(dev);
701 	return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
702 }
703 
704 static ssize_t
sdev_store_timeout(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)705 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
706 		    const char *buf, size_t count)
707 {
708 	struct scsi_device *sdev;
709 	int timeout;
710 	sdev = to_scsi_device(dev);
711 	sscanf (buf, "%d\n", &timeout);
712 	blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
713 	return count;
714 }
715 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
716 
717 static ssize_t
sdev_show_eh_timeout(struct device * dev,struct device_attribute * attr,char * buf)718 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
719 {
720 	struct scsi_device *sdev;
721 	sdev = to_scsi_device(dev);
722 	return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
723 }
724 
725 static ssize_t
sdev_store_eh_timeout(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)726 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
727 		    const char *buf, size_t count)
728 {
729 	struct scsi_device *sdev;
730 	unsigned int eh_timeout;
731 	int err;
732 
733 	if (!capable(CAP_SYS_ADMIN))
734 		return -EACCES;
735 
736 	sdev = to_scsi_device(dev);
737 	err = kstrtouint(buf, 10, &eh_timeout);
738 	if (err)
739 		return err;
740 	sdev->eh_timeout = eh_timeout * HZ;
741 
742 	return count;
743 }
744 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
745 
746 static ssize_t
store_rescan_field(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)747 store_rescan_field (struct device *dev, struct device_attribute *attr,
748 		    const char *buf, size_t count)
749 {
750 	scsi_rescan_device(to_scsi_device(dev));
751 	return count;
752 }
753 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
754 
755 static ssize_t
sdev_store_delete(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)756 sdev_store_delete(struct device *dev, struct device_attribute *attr,
757 		  const char *buf, size_t count)
758 {
759 	struct kernfs_node *kn;
760 	struct scsi_device *sdev = to_scsi_device(dev);
761 
762 	/*
763 	 * We need to try to get module, avoiding the module been removed
764 	 * during delete.
765 	 */
766 	if (scsi_device_get(sdev))
767 		return -ENODEV;
768 
769 	kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
770 	WARN_ON_ONCE(!kn);
771 	/*
772 	 * Concurrent writes into the "delete" sysfs attribute may trigger
773 	 * concurrent calls to device_remove_file() and scsi_remove_device().
774 	 * device_remove_file() handles concurrent removal calls by
775 	 * serializing these and by ignoring the second and later removal
776 	 * attempts.  Concurrent calls of scsi_remove_device() are
777 	 * serialized. The second and later calls of scsi_remove_device() are
778 	 * ignored because the first call of that function changes the device
779 	 * state into SDEV_DEL.
780 	 */
781 	device_remove_file(dev, attr);
782 	scsi_remove_device(sdev);
783 	if (kn)
784 		sysfs_unbreak_active_protection(kn);
785 	scsi_device_put(sdev);
786 	return count;
787 };
788 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
789 
790 static ssize_t
store_state_field(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)791 store_state_field(struct device *dev, struct device_attribute *attr,
792 		  const char *buf, size_t count)
793 {
794 	int i, ret;
795 	struct scsi_device *sdev = to_scsi_device(dev);
796 	enum scsi_device_state state = 0;
797 	bool rescan_dev = false;
798 
799 	for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
800 		const int len = strlen(sdev_states[i].name);
801 		if (strncmp(sdev_states[i].name, buf, len) == 0 &&
802 		   buf[len] == '\n') {
803 			state = sdev_states[i].value;
804 			break;
805 		}
806 	}
807 	switch (state) {
808 	case SDEV_RUNNING:
809 	case SDEV_OFFLINE:
810 		break;
811 	default:
812 		return -EINVAL;
813 	}
814 
815 	mutex_lock(&sdev->state_mutex);
816 	switch (sdev->sdev_state) {
817 	case SDEV_RUNNING:
818 	case SDEV_OFFLINE:
819 		break;
820 	default:
821 		mutex_unlock(&sdev->state_mutex);
822 		return -EINVAL;
823 	}
824 	if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
825 		ret = 0;
826 	} else {
827 		ret = scsi_device_set_state(sdev, state);
828 		if (ret == 0 && state == SDEV_RUNNING)
829 			rescan_dev = true;
830 	}
831 	mutex_unlock(&sdev->state_mutex);
832 
833 	if (rescan_dev) {
834 		/*
835 		 * If the device state changes to SDEV_RUNNING, we need to
836 		 * run the queue to avoid I/O hang, and rescan the device
837 		 * to revalidate it. Running the queue first is necessary
838 		 * because another thread may be waiting inside
839 		 * blk_mq_freeze_queue_wait() and because that call may be
840 		 * waiting for pending I/O to finish.
841 		 */
842 		blk_mq_run_hw_queues(sdev->request_queue, true);
843 		scsi_rescan_device(sdev);
844 	}
845 
846 	return ret == 0 ? count : -EINVAL;
847 }
848 
849 static ssize_t
show_state_field(struct device * dev,struct device_attribute * attr,char * buf)850 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
851 {
852 	struct scsi_device *sdev = to_scsi_device(dev);
853 	const char *name = scsi_device_state_name(sdev->sdev_state);
854 
855 	if (!name)
856 		return -EINVAL;
857 
858 	return snprintf(buf, 20, "%s\n", name);
859 }
860 
861 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
862 
863 static ssize_t
show_queue_type_field(struct device * dev,struct device_attribute * attr,char * buf)864 show_queue_type_field(struct device *dev, struct device_attribute *attr,
865 		      char *buf)
866 {
867 	struct scsi_device *sdev = to_scsi_device(dev);
868 	const char *name = "none";
869 
870 	if (sdev->simple_tags)
871 		name = "simple";
872 
873 	return snprintf(buf, 20, "%s\n", name);
874 }
875 
876 static ssize_t
store_queue_type_field(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)877 store_queue_type_field(struct device *dev, struct device_attribute *attr,
878 		       const char *buf, size_t count)
879 {
880 	struct scsi_device *sdev = to_scsi_device(dev);
881 
882 	if (!sdev->tagged_supported)
883 		return -EINVAL;
884 
885 	sdev_printk(KERN_INFO, sdev,
886 		    "ignoring write to deprecated queue_type attribute");
887 	return count;
888 }
889 
890 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
891 		   store_queue_type_field);
892 
893 #define sdev_vpd_pg_attr(_page)						\
894 static ssize_t							\
895 show_vpd_##_page(struct file *filp, struct kobject *kobj,	\
896 		 struct bin_attribute *bin_attr,			\
897 		 char *buf, loff_t off, size_t count)			\
898 {									\
899 	struct device *dev = kobj_to_dev(kobj);				\
900 	struct scsi_device *sdev = to_scsi_device(dev);			\
901 	struct scsi_vpd *vpd_page;					\
902 	int ret = -EINVAL;						\
903 									\
904 	rcu_read_lock();						\
905 	vpd_page = rcu_dereference(sdev->vpd_##_page);			\
906 	if (vpd_page)							\
907 		ret = memory_read_from_buffer(buf, count, &off,		\
908 				vpd_page->data, vpd_page->len);		\
909 	rcu_read_unlock();						\
910 	return ret;							\
911 }									\
912 static struct bin_attribute dev_attr_vpd_##_page = {		\
913 	.attr =	{.name = __stringify(vpd_##_page), .mode = S_IRUGO },	\
914 	.size = 0,							\
915 	.read = show_vpd_##_page,					\
916 };
917 
918 sdev_vpd_pg_attr(pg83);
919 sdev_vpd_pg_attr(pg80);
920 sdev_vpd_pg_attr(pg89);
921 sdev_vpd_pg_attr(pgb0);
922 sdev_vpd_pg_attr(pgb1);
923 sdev_vpd_pg_attr(pgb2);
924 sdev_vpd_pg_attr(pg0);
925 
show_inquiry(struct file * filep,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)926 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
927 			    struct bin_attribute *bin_attr,
928 			    char *buf, loff_t off, size_t count)
929 {
930 	struct device *dev = kobj_to_dev(kobj);
931 	struct scsi_device *sdev = to_scsi_device(dev);
932 
933 	if (!sdev->inquiry)
934 		return -EINVAL;
935 
936 	return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
937 				       sdev->inquiry_len);
938 }
939 
940 static struct bin_attribute dev_attr_inquiry = {
941 	.attr = {
942 		.name = "inquiry",
943 		.mode = S_IRUGO,
944 	},
945 	.size = 0,
946 	.read = show_inquiry,
947 };
948 
949 static ssize_t
show_iostat_counterbits(struct device * dev,struct device_attribute * attr,char * buf)950 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
951 			char *buf)
952 {
953 	return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
954 }
955 
956 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
957 
958 #define show_sdev_iostat(field)						\
959 static ssize_t								\
960 show_iostat_##field(struct device *dev, struct device_attribute *attr,	\
961 		    char *buf)						\
962 {									\
963 	struct scsi_device *sdev = to_scsi_device(dev);			\
964 	unsigned long long count = atomic_read(&sdev->field);		\
965 	return snprintf(buf, 20, "0x%llx\n", count);			\
966 }									\
967 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
968 
969 show_sdev_iostat(iorequest_cnt);
970 show_sdev_iostat(iodone_cnt);
971 show_sdev_iostat(ioerr_cnt);
972 show_sdev_iostat(iotmo_cnt);
973 
974 static ssize_t
sdev_show_modalias(struct device * dev,struct device_attribute * attr,char * buf)975 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
976 {
977 	struct scsi_device *sdev;
978 	sdev = to_scsi_device(dev);
979 	return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
980 }
981 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
982 
983 #define DECLARE_EVT_SHOW(name, Cap_name)				\
984 static ssize_t								\
985 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr,	\
986 		     char *buf)						\
987 {									\
988 	struct scsi_device *sdev = to_scsi_device(dev);			\
989 	int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
990 	return snprintf(buf, 20, "%d\n", val);				\
991 }
992 
993 #define DECLARE_EVT_STORE(name, Cap_name)				\
994 static ssize_t								\
995 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
996 		      const char *buf, size_t count)			\
997 {									\
998 	struct scsi_device *sdev = to_scsi_device(dev);			\
999 	int val = simple_strtoul(buf, NULL, 0);				\
1000 	if (val == 0)							\
1001 		clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events);	\
1002 	else if (val == 1)						\
1003 		set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);	\
1004 	else								\
1005 		return -EINVAL;						\
1006 	return count;							\
1007 }
1008 
1009 #define DECLARE_EVT(name, Cap_name)					\
1010 	DECLARE_EVT_SHOW(name, Cap_name)				\
1011 	DECLARE_EVT_STORE(name, Cap_name)				\
1012 	static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,	\
1013 			   sdev_store_evt_##name);
1014 #define REF_EVT(name) &dev_attr_evt_##name.attr
1015 
DECLARE_EVT(media_change,MEDIA_CHANGE)1016 DECLARE_EVT(media_change, MEDIA_CHANGE)
1017 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1018 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1019 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1020 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1021 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1022 
1023 static ssize_t
1024 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1025 		       const char *buf, size_t count)
1026 {
1027 	int depth, retval;
1028 	struct scsi_device *sdev = to_scsi_device(dev);
1029 	const struct scsi_host_template *sht = sdev->host->hostt;
1030 
1031 	if (!sht->change_queue_depth)
1032 		return -EINVAL;
1033 
1034 	depth = simple_strtoul(buf, NULL, 0);
1035 
1036 	if (depth < 1 || depth > sdev->host->can_queue)
1037 		return -EINVAL;
1038 
1039 	retval = sht->change_queue_depth(sdev, depth);
1040 	if (retval < 0)
1041 		return retval;
1042 
1043 	sdev->max_queue_depth = sdev->queue_depth;
1044 
1045 	return count;
1046 }
1047 sdev_show_function(queue_depth, "%d\n");
1048 
1049 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1050 		   sdev_store_queue_depth);
1051 
1052 static ssize_t
sdev_show_wwid(struct device * dev,struct device_attribute * attr,char * buf)1053 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1054 		    char *buf)
1055 {
1056 	struct scsi_device *sdev = to_scsi_device(dev);
1057 	ssize_t count;
1058 
1059 	count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1060 	if (count > 0) {
1061 		buf[count] = '\n';
1062 		count++;
1063 	}
1064 	return count;
1065 }
1066 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1067 
1068 #define BLIST_FLAG_NAME(name)					\
1069 	[const_ilog2((__force __u64)BLIST_##name)] = #name
1070 static const char *const sdev_bflags_name[] = {
1071 #include "scsi_devinfo_tbl.c"
1072 };
1073 #undef BLIST_FLAG_NAME
1074 
1075 static ssize_t
sdev_show_blacklist(struct device * dev,struct device_attribute * attr,char * buf)1076 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1077 		    char *buf)
1078 {
1079 	struct scsi_device *sdev = to_scsi_device(dev);
1080 	int i;
1081 	ssize_t len = 0;
1082 
1083 	for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1084 		const char *name = NULL;
1085 
1086 		if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1087 			continue;
1088 		if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1089 			name = sdev_bflags_name[i];
1090 
1091 		if (name)
1092 			len += scnprintf(buf + len, PAGE_SIZE - len,
1093 					 "%s%s", len ? " " : "", name);
1094 		else
1095 			len += scnprintf(buf + len, PAGE_SIZE - len,
1096 					 "%sINVALID_BIT(%d)", len ? " " : "", i);
1097 	}
1098 	if (len)
1099 		len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1100 	return len;
1101 }
1102 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1103 
1104 #ifdef CONFIG_SCSI_DH
1105 static ssize_t
sdev_show_dh_state(struct device * dev,struct device_attribute * attr,char * buf)1106 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1107 		   char *buf)
1108 {
1109 	struct scsi_device *sdev = to_scsi_device(dev);
1110 
1111 	if (!sdev->handler)
1112 		return snprintf(buf, 20, "detached\n");
1113 
1114 	return snprintf(buf, 20, "%s\n", sdev->handler->name);
1115 }
1116 
1117 static ssize_t
sdev_store_dh_state(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1118 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1119 		    const char *buf, size_t count)
1120 {
1121 	struct scsi_device *sdev = to_scsi_device(dev);
1122 	int err = -EINVAL;
1123 
1124 	if (sdev->sdev_state == SDEV_CANCEL ||
1125 	    sdev->sdev_state == SDEV_DEL)
1126 		return -ENODEV;
1127 
1128 	if (!sdev->handler) {
1129 		/*
1130 		 * Attach to a device handler
1131 		 */
1132 		err = scsi_dh_attach(sdev->request_queue, buf);
1133 	} else if (!strncmp(buf, "activate", 8)) {
1134 		/*
1135 		 * Activate a device handler
1136 		 */
1137 		if (sdev->handler->activate)
1138 			err = sdev->handler->activate(sdev, NULL, NULL);
1139 		else
1140 			err = 0;
1141 	} else if (!strncmp(buf, "detach", 6)) {
1142 		/*
1143 		 * Detach from a device handler
1144 		 */
1145 		sdev_printk(KERN_WARNING, sdev,
1146 			    "can't detach handler %s.\n",
1147 			    sdev->handler->name);
1148 		err = -EINVAL;
1149 	}
1150 
1151 	return err < 0 ? err : count;
1152 }
1153 
1154 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1155 		   sdev_store_dh_state);
1156 
1157 static ssize_t
sdev_show_access_state(struct device * dev,struct device_attribute * attr,char * buf)1158 sdev_show_access_state(struct device *dev,
1159 		       struct device_attribute *attr,
1160 		       char *buf)
1161 {
1162 	struct scsi_device *sdev = to_scsi_device(dev);
1163 	unsigned char access_state;
1164 	const char *access_state_name;
1165 
1166 	if (!sdev->handler)
1167 		return -EINVAL;
1168 
1169 	access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1170 	access_state_name = scsi_access_state_name(access_state);
1171 
1172 	return sprintf(buf, "%s\n",
1173 		       access_state_name ? access_state_name : "unknown");
1174 }
1175 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1176 
1177 static ssize_t
sdev_show_preferred_path(struct device * dev,struct device_attribute * attr,char * buf)1178 sdev_show_preferred_path(struct device *dev,
1179 			 struct device_attribute *attr,
1180 			 char *buf)
1181 {
1182 	struct scsi_device *sdev = to_scsi_device(dev);
1183 
1184 	if (!sdev->handler)
1185 		return -EINVAL;
1186 
1187 	if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1188 		return sprintf(buf, "1\n");
1189 	else
1190 		return sprintf(buf, "0\n");
1191 }
1192 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1193 #endif
1194 
1195 static ssize_t
sdev_show_queue_ramp_up_period(struct device * dev,struct device_attribute * attr,char * buf)1196 sdev_show_queue_ramp_up_period(struct device *dev,
1197 			       struct device_attribute *attr,
1198 			       char *buf)
1199 {
1200 	struct scsi_device *sdev;
1201 	sdev = to_scsi_device(dev);
1202 	return snprintf(buf, 20, "%u\n",
1203 			jiffies_to_msecs(sdev->queue_ramp_up_period));
1204 }
1205 
1206 static ssize_t
sdev_store_queue_ramp_up_period(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1207 sdev_store_queue_ramp_up_period(struct device *dev,
1208 				struct device_attribute *attr,
1209 				const char *buf, size_t count)
1210 {
1211 	struct scsi_device *sdev = to_scsi_device(dev);
1212 	unsigned int period;
1213 
1214 	if (kstrtouint(buf, 10, &period))
1215 		return -EINVAL;
1216 
1217 	sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1218 	return count;
1219 }
1220 
1221 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1222 		   sdev_show_queue_ramp_up_period,
1223 		   sdev_store_queue_ramp_up_period);
1224 
sdev_show_cdl_enable(struct device * dev,struct device_attribute * attr,char * buf)1225 static ssize_t sdev_show_cdl_enable(struct device *dev,
1226 				    struct device_attribute *attr, char *buf)
1227 {
1228 	struct scsi_device *sdev = to_scsi_device(dev);
1229 
1230 	return sysfs_emit(buf, "%d\n", (int)sdev->cdl_enable);
1231 }
1232 
sdev_store_cdl_enable(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1233 static ssize_t sdev_store_cdl_enable(struct device *dev,
1234 				     struct device_attribute *attr,
1235 				     const char *buf, size_t count)
1236 {
1237 	int ret;
1238 	bool v;
1239 
1240 	if (kstrtobool(buf, &v))
1241 		return -EINVAL;
1242 
1243 	ret = scsi_cdl_enable(to_scsi_device(dev), v);
1244 	if (ret)
1245 		return ret;
1246 
1247 	return count;
1248 }
1249 static DEVICE_ATTR(cdl_enable, S_IRUGO | S_IWUSR,
1250 		   sdev_show_cdl_enable, sdev_store_cdl_enable);
1251 
scsi_sdev_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)1252 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1253 					 struct attribute *attr, int i)
1254 {
1255 	struct device *dev = kobj_to_dev(kobj);
1256 	struct scsi_device *sdev = to_scsi_device(dev);
1257 
1258 
1259 	if (attr == &dev_attr_queue_depth.attr &&
1260 	    !sdev->host->hostt->change_queue_depth)
1261 		return S_IRUGO;
1262 
1263 	if (attr == &dev_attr_queue_ramp_up_period.attr &&
1264 	    !sdev->host->hostt->change_queue_depth)
1265 		return 0;
1266 
1267 	return attr->mode;
1268 }
1269 
scsi_sdev_bin_attr_is_visible(struct kobject * kobj,struct bin_attribute * attr,int i)1270 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1271 					     struct bin_attribute *attr, int i)
1272 {
1273 	struct device *dev = kobj_to_dev(kobj);
1274 	struct scsi_device *sdev = to_scsi_device(dev);
1275 
1276 
1277 	if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1278 		return 0;
1279 
1280 	if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1281 		return 0;
1282 
1283 	if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1284 		return 0;
1285 
1286 	if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1287 		return 0;
1288 
1289 	if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1290 		return 0;
1291 
1292 	if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1293 		return 0;
1294 
1295 	if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1296 		return 0;
1297 
1298 	return S_IRUGO;
1299 }
1300 
1301 /* Default template for device attributes.  May NOT be modified */
1302 static struct attribute *scsi_sdev_attrs[] = {
1303 	&dev_attr_device_blocked.attr,
1304 	&dev_attr_type.attr,
1305 	&dev_attr_scsi_level.attr,
1306 	&dev_attr_device_busy.attr,
1307 	&dev_attr_vendor.attr,
1308 	&dev_attr_model.attr,
1309 	&dev_attr_rev.attr,
1310 	&dev_attr_rescan.attr,
1311 	&dev_attr_delete.attr,
1312 	&dev_attr_state.attr,
1313 	&dev_attr_timeout.attr,
1314 	&dev_attr_eh_timeout.attr,
1315 	&dev_attr_iocounterbits.attr,
1316 	&dev_attr_iorequest_cnt.attr,
1317 	&dev_attr_iodone_cnt.attr,
1318 	&dev_attr_ioerr_cnt.attr,
1319 	&dev_attr_iotmo_cnt.attr,
1320 	&dev_attr_modalias.attr,
1321 	&dev_attr_queue_depth.attr,
1322 	&dev_attr_queue_type.attr,
1323 	&dev_attr_wwid.attr,
1324 	&dev_attr_blacklist.attr,
1325 #ifdef CONFIG_SCSI_DH
1326 	&dev_attr_dh_state.attr,
1327 	&dev_attr_access_state.attr,
1328 	&dev_attr_preferred_path.attr,
1329 #endif
1330 	&dev_attr_queue_ramp_up_period.attr,
1331 	&dev_attr_cdl_supported.attr,
1332 	&dev_attr_cdl_enable.attr,
1333 	REF_EVT(media_change),
1334 	REF_EVT(inquiry_change_reported),
1335 	REF_EVT(capacity_change_reported),
1336 	REF_EVT(soft_threshold_reached),
1337 	REF_EVT(mode_parameter_change_reported),
1338 	REF_EVT(lun_change_reported),
1339 	NULL
1340 };
1341 
1342 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1343 	&dev_attr_vpd_pg0,
1344 	&dev_attr_vpd_pg83,
1345 	&dev_attr_vpd_pg80,
1346 	&dev_attr_vpd_pg89,
1347 	&dev_attr_vpd_pgb0,
1348 	&dev_attr_vpd_pgb1,
1349 	&dev_attr_vpd_pgb2,
1350 	&dev_attr_inquiry,
1351 	NULL
1352 };
1353 static struct attribute_group scsi_sdev_attr_group = {
1354 	.attrs =	scsi_sdev_attrs,
1355 	.bin_attrs =	scsi_sdev_bin_attrs,
1356 	.is_visible =	scsi_sdev_attr_is_visible,
1357 	.is_bin_visible = scsi_sdev_bin_attr_is_visible,
1358 };
1359 
1360 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1361 	&scsi_sdev_attr_group,
1362 	NULL
1363 };
1364 
scsi_target_add(struct scsi_target * starget)1365 static int scsi_target_add(struct scsi_target *starget)
1366 {
1367 	int error;
1368 
1369 	if (starget->state != STARGET_CREATED)
1370 		return 0;
1371 
1372 	error = device_add(&starget->dev);
1373 	if (error) {
1374 		dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1375 		return error;
1376 	}
1377 	transport_add_device(&starget->dev);
1378 	starget->state = STARGET_RUNNING;
1379 
1380 	pm_runtime_set_active(&starget->dev);
1381 	pm_runtime_enable(&starget->dev);
1382 	device_enable_async_suspend(&starget->dev);
1383 
1384 	return 0;
1385 }
1386 
1387 /**
1388  * scsi_sysfs_add_sdev - add scsi device to sysfs
1389  * @sdev:	scsi_device to add
1390  *
1391  * Return value:
1392  * 	0 on Success / non-zero on Failure
1393  **/
scsi_sysfs_add_sdev(struct scsi_device * sdev)1394 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1395 {
1396 	int error;
1397 	struct scsi_target *starget = sdev->sdev_target;
1398 
1399 	error = scsi_target_add(starget);
1400 	if (error)
1401 		return error;
1402 
1403 	transport_configure_device(&starget->dev);
1404 
1405 	device_enable_async_suspend(&sdev->sdev_gendev);
1406 	scsi_autopm_get_target(starget);
1407 	pm_runtime_set_active(&sdev->sdev_gendev);
1408 	if (!sdev->rpm_autosuspend)
1409 		pm_runtime_forbid(&sdev->sdev_gendev);
1410 	pm_runtime_enable(&sdev->sdev_gendev);
1411 	scsi_autopm_put_target(starget);
1412 
1413 	scsi_autopm_get_device(sdev);
1414 
1415 	scsi_dh_add_device(sdev);
1416 
1417 	error = device_add(&sdev->sdev_gendev);
1418 	if (error) {
1419 		sdev_printk(KERN_INFO, sdev,
1420 				"failed to add device: %d\n", error);
1421 		return error;
1422 	}
1423 
1424 	device_enable_async_suspend(&sdev->sdev_dev);
1425 	error = device_add(&sdev->sdev_dev);
1426 	if (error) {
1427 		sdev_printk(KERN_INFO, sdev,
1428 				"failed to add class device: %d\n", error);
1429 		device_del(&sdev->sdev_gendev);
1430 		return error;
1431 	}
1432 	transport_add_device(&sdev->sdev_gendev);
1433 	sdev->is_visible = 1;
1434 
1435 	if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1436 		sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1437 		if (IS_ERR(sdev->bsg_dev)) {
1438 			error = PTR_ERR(sdev->bsg_dev);
1439 			sdev_printk(KERN_INFO, sdev,
1440 				    "Failed to register bsg queue, errno=%d\n",
1441 				    error);
1442 			sdev->bsg_dev = NULL;
1443 		}
1444 	}
1445 
1446 	scsi_autopm_put_device(sdev);
1447 	return error;
1448 }
1449 
__scsi_remove_device(struct scsi_device * sdev)1450 void __scsi_remove_device(struct scsi_device *sdev)
1451 {
1452 	struct device *dev = &sdev->sdev_gendev;
1453 	int res;
1454 
1455 	/*
1456 	 * This cleanup path is not reentrant and while it is impossible
1457 	 * to get a new reference with scsi_device_get() someone can still
1458 	 * hold a previously acquired one.
1459 	 */
1460 	if (sdev->sdev_state == SDEV_DEL)
1461 		return;
1462 
1463 	if (sdev->is_visible) {
1464 		/*
1465 		 * If scsi_internal_target_block() is running concurrently,
1466 		 * wait until it has finished before changing the device state.
1467 		 */
1468 		mutex_lock(&sdev->state_mutex);
1469 		/*
1470 		 * If blocked, we go straight to DEL and restart the queue so
1471 		 * any commands issued during driver shutdown (like sync
1472 		 * cache) are errored immediately.
1473 		 */
1474 		res = scsi_device_set_state(sdev, SDEV_CANCEL);
1475 		if (res != 0) {
1476 			res = scsi_device_set_state(sdev, SDEV_DEL);
1477 			if (res == 0)
1478 				scsi_start_queue(sdev);
1479 		}
1480 		mutex_unlock(&sdev->state_mutex);
1481 
1482 		if (res != 0)
1483 			return;
1484 
1485 		if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1486 			bsg_unregister_queue(sdev->bsg_dev);
1487 		device_unregister(&sdev->sdev_dev);
1488 		transport_remove_device(dev);
1489 		device_del(dev);
1490 	} else
1491 		put_device(&sdev->sdev_dev);
1492 
1493 	/*
1494 	 * Stop accepting new requests and wait until all queuecommand() and
1495 	 * scsi_run_queue() invocations have finished before tearing down the
1496 	 * device.
1497 	 */
1498 	mutex_lock(&sdev->state_mutex);
1499 	scsi_device_set_state(sdev, SDEV_DEL);
1500 	mutex_unlock(&sdev->state_mutex);
1501 
1502 	blk_mq_destroy_queue(sdev->request_queue);
1503 	kref_put(&sdev->host->tagset_refcnt, scsi_mq_free_tags);
1504 	cancel_work_sync(&sdev->requeue_work);
1505 
1506 	if (sdev->host->hostt->slave_destroy)
1507 		sdev->host->hostt->slave_destroy(sdev);
1508 	transport_destroy_device(dev);
1509 
1510 	/*
1511 	 * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1512 	 * removed sysfs visibility from the device, so make the target
1513 	 * invisible if this was the last device underneath it.
1514 	 */
1515 	scsi_target_reap(scsi_target(sdev));
1516 
1517 	put_device(dev);
1518 }
1519 
1520 /**
1521  * scsi_remove_device - unregister a device from the scsi bus
1522  * @sdev:	scsi_device to unregister
1523  **/
scsi_remove_device(struct scsi_device * sdev)1524 void scsi_remove_device(struct scsi_device *sdev)
1525 {
1526 	struct Scsi_Host *shost = sdev->host;
1527 
1528 	mutex_lock(&shost->scan_mutex);
1529 	__scsi_remove_device(sdev);
1530 	mutex_unlock(&shost->scan_mutex);
1531 }
1532 EXPORT_SYMBOL(scsi_remove_device);
1533 
__scsi_remove_target(struct scsi_target * starget)1534 static void __scsi_remove_target(struct scsi_target *starget)
1535 {
1536 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1537 	unsigned long flags;
1538 	struct scsi_device *sdev;
1539 
1540 	spin_lock_irqsave(shost->host_lock, flags);
1541  restart:
1542 	list_for_each_entry(sdev, &shost->__devices, siblings) {
1543 		/*
1544 		 * We cannot call scsi_device_get() here, as
1545 		 * we might've been called from rmmod() causing
1546 		 * scsi_device_get() to fail the module_is_live()
1547 		 * check.
1548 		 */
1549 		if (sdev->channel != starget->channel ||
1550 		    sdev->id != starget->id)
1551 			continue;
1552 		if (sdev->sdev_state == SDEV_DEL ||
1553 		    sdev->sdev_state == SDEV_CANCEL ||
1554 		    !get_device(&sdev->sdev_gendev))
1555 			continue;
1556 		spin_unlock_irqrestore(shost->host_lock, flags);
1557 		scsi_remove_device(sdev);
1558 		put_device(&sdev->sdev_gendev);
1559 		spin_lock_irqsave(shost->host_lock, flags);
1560 		goto restart;
1561 	}
1562 	spin_unlock_irqrestore(shost->host_lock, flags);
1563 }
1564 
1565 /**
1566  * scsi_remove_target - try to remove a target and all its devices
1567  * @dev: generic starget or parent of generic stargets to be removed
1568  *
1569  * Note: This is slightly racy.  It is possible that if the user
1570  * requests the addition of another device then the target won't be
1571  * removed.
1572  */
scsi_remove_target(struct device * dev)1573 void scsi_remove_target(struct device *dev)
1574 {
1575 	struct Scsi_Host *shost = dev_to_shost(dev->parent);
1576 	struct scsi_target *starget;
1577 	unsigned long flags;
1578 
1579 restart:
1580 	spin_lock_irqsave(shost->host_lock, flags);
1581 	list_for_each_entry(starget, &shost->__targets, siblings) {
1582 		if (starget->state == STARGET_DEL ||
1583 		    starget->state == STARGET_REMOVE ||
1584 		    starget->state == STARGET_CREATED_REMOVE)
1585 			continue;
1586 		if (starget->dev.parent == dev || &starget->dev == dev) {
1587 			kref_get(&starget->reap_ref);
1588 			if (starget->state == STARGET_CREATED)
1589 				starget->state = STARGET_CREATED_REMOVE;
1590 			else
1591 				starget->state = STARGET_REMOVE;
1592 			spin_unlock_irqrestore(shost->host_lock, flags);
1593 			__scsi_remove_target(starget);
1594 			scsi_target_reap(starget);
1595 			goto restart;
1596 		}
1597 	}
1598 	spin_unlock_irqrestore(shost->host_lock, flags);
1599 }
1600 EXPORT_SYMBOL(scsi_remove_target);
1601 
scsi_register_driver(struct device_driver * drv)1602 int scsi_register_driver(struct device_driver *drv)
1603 {
1604 	drv->bus = &scsi_bus_type;
1605 
1606 	return driver_register(drv);
1607 }
1608 EXPORT_SYMBOL(scsi_register_driver);
1609 
scsi_register_interface(struct class_interface * intf)1610 int scsi_register_interface(struct class_interface *intf)
1611 {
1612 	intf->class = &sdev_class;
1613 
1614 	return class_interface_register(intf);
1615 }
1616 EXPORT_SYMBOL(scsi_register_interface);
1617 
1618 /**
1619  * scsi_sysfs_add_host - add scsi host to subsystem
1620  * @shost:     scsi host struct to add to subsystem
1621  **/
scsi_sysfs_add_host(struct Scsi_Host * shost)1622 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1623 {
1624 	transport_register_device(&shost->shost_gendev);
1625 	transport_configure_device(&shost->shost_gendev);
1626 	return 0;
1627 }
1628 
1629 static struct device_type scsi_dev_type = {
1630 	.name =		"scsi_device",
1631 	.release =	scsi_device_dev_release,
1632 	.groups =	scsi_sdev_attr_groups,
1633 };
1634 
scsi_sysfs_device_initialize(struct scsi_device * sdev)1635 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1636 {
1637 	unsigned long flags;
1638 	struct Scsi_Host *shost = sdev->host;
1639 	const struct scsi_host_template *hostt = shost->hostt;
1640 	struct scsi_target  *starget = sdev->sdev_target;
1641 
1642 	device_initialize(&sdev->sdev_gendev);
1643 	sdev->sdev_gendev.bus = &scsi_bus_type;
1644 	sdev->sdev_gendev.type = &scsi_dev_type;
1645 	scsi_enable_async_suspend(&sdev->sdev_gendev);
1646 	dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1647 		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1648 	sdev->sdev_gendev.groups = hostt->sdev_groups;
1649 
1650 	device_initialize(&sdev->sdev_dev);
1651 	sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1652 	sdev->sdev_dev.class = &sdev_class;
1653 	dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1654 		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1655 	/*
1656 	 * Get a default scsi_level from the target (derived from sibling
1657 	 * devices).  This is the best we can do for guessing how to set
1658 	 * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1659 	 * setting doesn't matter, because all the bits are zero anyway.
1660 	 * But it does matter for higher LUNs.
1661 	 */
1662 	sdev->scsi_level = starget->scsi_level;
1663 	if (sdev->scsi_level <= SCSI_2 &&
1664 			sdev->scsi_level != SCSI_UNKNOWN &&
1665 			!shost->no_scsi2_lun_in_cdb)
1666 		sdev->lun_in_cdb = 1;
1667 
1668 	transport_setup_device(&sdev->sdev_gendev);
1669 	spin_lock_irqsave(shost->host_lock, flags);
1670 	list_add_tail(&sdev->same_target_siblings, &starget->devices);
1671 	list_add_tail(&sdev->siblings, &shost->__devices);
1672 	spin_unlock_irqrestore(shost->host_lock, flags);
1673 	/*
1674 	 * device can now only be removed via __scsi_remove_device() so hold
1675 	 * the target.  Target will be held in CREATED state until something
1676 	 * beneath it becomes visible (in which case it moves to RUNNING)
1677 	 */
1678 	kref_get(&starget->reap_ref);
1679 }
1680 
scsi_is_sdev_device(const struct device * dev)1681 int scsi_is_sdev_device(const struct device *dev)
1682 {
1683 	return dev->type == &scsi_dev_type;
1684 }
1685 EXPORT_SYMBOL(scsi_is_sdev_device);
1686 
1687 /* A blank transport template that is used in drivers that don't
1688  * yet implement Transport Attributes */
1689 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
1690