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192.168.1.100 / T103 / 1f884588077ad3476b9c91cbb0ee9ee0332bbb68 / . / src / kernel / linux / v4.14 / include / scsi / scsi_device.h
blob: 571ddb49b92693ef6f5f4eebc11985f51765a8ff [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame^]1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _SCSI_SCSI_DEVICE_H
3#define _SCSI_SCSI_DEVICE_H
4
5#include <linux/list.h>
6#include <linux/spinlock.h>
7#include <linux/workqueue.h>
8#include <linux/blkdev.h>
9#include <scsi/scsi.h>
10#include <linux/atomic.h>
11
12struct device;
13struct request_queue;
14struct scsi_cmnd;
15struct scsi_lun;
16struct scsi_sense_hdr;
17
18struct scsi_mode_data {
19 __u32 length;
20 __u16 block_descriptor_length;
21 __u8 medium_type;
22 __u8 device_specific;
23 __u8 header_length;
24 __u8 longlba:1;
25};
26
27/*
28 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
29 * (for the ascii descriptions) and the state model enforcer:
30 * scsi_lib:scsi_device_set_state().
31 */
32enum scsi_device_state {
33 SDEV_CREATED = 1, /* device created but not added to sysfs
34 * Only internal commands allowed (for inq) */
35 SDEV_RUNNING, /* device properly configured
36 * All commands allowed */
37 SDEV_CANCEL, /* beginning to delete device
38 * Only error handler commands allowed */
39 SDEV_DEL, /* device deleted
40 * no commands allowed */
41 SDEV_QUIESCE, /* Device quiescent. No block commands
42 * will be accepted, only specials (which
43 * originate in the mid-layer) */
44 SDEV_OFFLINE, /* Device offlined (by error handling or
45 * user request */
46 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
47 SDEV_BLOCK, /* Device blocked by scsi lld. No
48 * scsi commands from user or midlayer
49 * should be issued to the scsi
50 * lld. */
51 SDEV_CREATED_BLOCK, /* same as above but for created devices */
52};
53
54enum scsi_scan_mode {
55 SCSI_SCAN_INITIAL = 0,
56 SCSI_SCAN_RESCAN,
57 SCSI_SCAN_MANUAL,
58};
59
60enum scsi_device_event {
61 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
62 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
63 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
64 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
65 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
66 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
67 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
68
69 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
70 SDEV_EVT_LAST = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,
71
72 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
73};
74
75struct scsi_event {
76 enum scsi_device_event evt_type;
77 struct list_head node;
78
79 /* put union of data structures, for non-simple event types,
80 * here
81 */
82};
83
84/**
85 * struct scsi_vpd - SCSI Vital Product Data
86 * @rcu: For kfree_rcu().
87 * @len: Length in bytes of @data.
88 * @data: VPD data as defined in various T10 SCSI standard documents.
89 */
90struct scsi_vpd {
91 struct rcu_head rcu;
92 int len;
93 unsigned char data[];
94};
95
96struct scsi_device {
97 struct Scsi_Host *host;
98 struct request_queue *request_queue;
99
100 /* the next two are protected by the host->host_lock */
101 struct list_head siblings; /* list of all devices on this host */
102 struct list_head same_target_siblings; /* just the devices sharing same target id */
103
104 atomic_t device_busy; /* commands actually active on LLDD */
105 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
106
107 spinlock_t list_lock;
108 struct list_head cmd_list; /* queue of in use SCSI Command structures */
109 struct list_head starved_entry;
110 unsigned short queue_depth; /* How deep of a queue we want */
111 unsigned short max_queue_depth; /* max queue depth */
112 unsigned short last_queue_full_depth; /* These two are used by */
113 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
114 unsigned long last_queue_full_time; /* last queue full time */
115 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
116#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
117
118 unsigned long last_queue_ramp_up; /* last queue ramp up time */
119
120 unsigned int id, channel;
121 u64 lun;
122 unsigned int manufacturer; /* Manufacturer of device, for using
123 * vendor-specific cmd's */
124 unsigned sector_size; /* size in bytes */
125
126 void *hostdata; /* available to low-level driver */
127 unsigned char type;
128 char scsi_level;
129 char inq_periph_qual; /* PQ from INQUIRY data */
130 struct mutex inquiry_mutex;
131 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
132 unsigned char * inquiry; /* INQUIRY response data */
133 const char * vendor; /* [back_compat] point into 'inquiry' ... */
134 const char * model; /* ... after scan; point to static string */
135 const char * rev; /* ... "nullnullnullnull" before scan */
136
137#define SCSI_VPD_PG_LEN 255
138 struct scsi_vpd __rcu *vpd_pg83;
139 struct scsi_vpd __rcu *vpd_pg80;
140 unsigned char current_tag; /* current tag */
141 struct scsi_target *sdev_target; /* used only for single_lun */
142
143 unsigned int sdev_bflags; /* black/white flags as also found in
144 * scsi_devinfo.[hc]. For now used only to
145 * pass settings from slave_alloc to scsi
146 * core. */
147 unsigned int eh_timeout; /* Error handling timeout */
148 unsigned removable:1;
149 unsigned changed:1; /* Data invalid due to media change */
150 unsigned busy:1; /* Used to prevent races */
151 unsigned lockable:1; /* Able to prevent media removal */
152 unsigned locked:1; /* Media removal disabled */
153 unsigned borken:1; /* Tell the Seagate driver to be
154 * painfully slow on this device */
155 unsigned disconnect:1; /* can disconnect */
156 unsigned soft_reset:1; /* Uses soft reset option */
157 unsigned sdtr:1; /* Device supports SDTR messages */
158 unsigned wdtr:1; /* Device supports WDTR messages */
159 unsigned ppr:1; /* Device supports PPR messages */
160 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
161 unsigned simple_tags:1; /* simple queue tag messages are enabled */
162 unsigned was_reset:1; /* There was a bus reset on the bus for
163 * this device */
164 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
165 * because we did a bus reset. */
166 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
167 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
168 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
169 unsigned no_write_same:1; /* no WRITE SAME command */
170 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
171 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
172 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
173 unsigned skip_vpd_pages:1; /* do not read VPD pages */
174 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
175 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
176 unsigned no_start_on_add:1; /* do not issue start on add */
177 unsigned allow_restart:1; /* issue START_UNIT in error handler */
178 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
179 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
180 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
181 unsigned select_no_atn:1;
182 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
183 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
184 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
185 unsigned last_sector_bug:1; /* do not use multisector accesses on
186 SD_LAST_BUGGY_SECTORS */
187 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
188 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
189 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
190 unsigned security_supported:1; /* Supports Security Protocols */
191 unsigned is_visible:1; /* is the device visible in sysfs */
192 unsigned wce_default_on:1; /* Cache is ON by default */
193 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
194 unsigned broken_fua:1; /* Don't set FUA bit */
195 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
196 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
197
198 atomic_t disk_events_disable_depth; /* disable depth for disk events */
199
200 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
201 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
202 struct list_head event_list; /* asserted events */
203 struct work_struct event_work;
204
205 unsigned int max_device_blocked; /* what device_blocked counts down from */
206#define SCSI_DEFAULT_DEVICE_BLOCKED 3
207
208 atomic_t iorequest_cnt;
209 atomic_t iodone_cnt;
210 atomic_t ioerr_cnt;
211
212 struct device sdev_gendev,
213 sdev_dev;
214
215 struct execute_work ew; /* used to get process context on put */
216 struct work_struct requeue_work;
217
218 struct scsi_device_handler *handler;
219 void *handler_data;
220
221 unsigned char access_state;
222 struct mutex state_mutex;
223 enum scsi_device_state sdev_state;
224 unsigned long sdev_data[0];
225} __attribute__((aligned(sizeof(unsigned long))));
226
227#define to_scsi_device(d) \
228 container_of(d, struct scsi_device, sdev_gendev)
229#define class_to_sdev(d) \
230 container_of(d, struct scsi_device, sdev_dev)
231#define transport_class_to_sdev(class_dev) \
232 to_scsi_device(class_dev->parent)
233
234#define sdev_dbg(sdev, fmt, a...) \
235 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
236
237/*
238 * like scmd_printk, but the device name is passed in
239 * as a string pointer
240 */
241__printf(4, 5) void
242sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
243 const char *, ...);
244
245#define sdev_printk(l, sdev, fmt, a...) \
246 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
247
248__printf(3, 4) void
249scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
250
251#define scmd_dbg(scmd, fmt, a...) \
252 do { \
253 if ((scmd)->request->rq_disk) \
254 sdev_dbg((scmd)->device, "[%s] " fmt, \
255 (scmd)->request->rq_disk->disk_name, ##a);\
256 else \
257 sdev_dbg((scmd)->device, fmt, ##a); \
258 } while (0)
259
260enum scsi_target_state {
261 STARGET_CREATED = 1,
262 STARGET_RUNNING,
263 STARGET_REMOVE,
264 STARGET_CREATED_REMOVE,
265 STARGET_DEL,
266};
267
268/*
269 * scsi_target: representation of a scsi target, for now, this is only
270 * used for single_lun devices. If no one has active IO to the target,
271 * starget_sdev_user is NULL, else it points to the active sdev.
272 */
273struct scsi_target {
274 struct scsi_device *starget_sdev_user;
275 struct list_head siblings;
276 struct list_head devices;
277 struct device dev;
278 struct kref reap_ref; /* last put renders target invisible */
279 unsigned int channel;
280 unsigned int id; /* target id ... replace
281 * scsi_device.id eventually */
282 unsigned int create:1; /* signal that it needs to be added */
283 unsigned int single_lun:1; /* Indicates we should only
284 * allow I/O to one of the luns
285 * for the device at a time. */
286 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
287 * means no lun present. */
288 unsigned int no_report_luns:1; /* Don't use
289 * REPORT LUNS for scanning. */
290 unsigned int expecting_lun_change:1; /* A device has reported
291 * a 3F/0E UA, other devices on
292 * the same target will also. */
293 /* commands actually active on LLD. */
294 atomic_t target_busy;
295 atomic_t target_blocked;
296
297 /*
298 * LLDs should set this in the slave_alloc host template callout.
299 * If set to zero then there is not limit.
300 */
301 unsigned int can_queue;
302 unsigned int max_target_blocked;
303#define SCSI_DEFAULT_TARGET_BLOCKED 3
304
305 char scsi_level;
306 enum scsi_target_state state;
307 void *hostdata; /* available to low-level driver */
308 unsigned long starget_data[0]; /* for the transport */
309 /* starget_data must be the last element!!!! */
310} __attribute__((aligned(sizeof(unsigned long))));
311
312#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
313static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
314{
315 return to_scsi_target(sdev->sdev_gendev.parent);
316}
317#define transport_class_to_starget(class_dev) \
318 to_scsi_target(class_dev->parent)
319
320#define starget_printk(prefix, starget, fmt, a...) \
321 dev_printk(prefix, &(starget)->dev, fmt, ##a)
322
323extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
324 uint, uint, u64, void *hostdata);
325extern int scsi_add_device(struct Scsi_Host *host, uint channel,
326 uint target, u64 lun);
327extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
328extern void scsi_remove_device(struct scsi_device *);
329extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
330void scsi_attach_vpd(struct scsi_device *sdev);
331
332extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
333extern int __must_check scsi_device_get(struct scsi_device *);
334extern void scsi_device_put(struct scsi_device *);
335extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
336 uint, uint, u64);
337extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
338 uint, uint, u64);
339extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
340 u64);
341extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
342 u64);
343extern void starget_for_each_device(struct scsi_target *, void *,
344 void (*fn)(struct scsi_device *, void *));
345extern void __starget_for_each_device(struct scsi_target *, void *,
346 void (*fn)(struct scsi_device *,
347 void *));
348
349/* only exposed to implement shost_for_each_device */
350extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
351 struct scsi_device *);
352
353/**
354 * shost_for_each_device - iterate over all devices of a host
355 * @sdev: the &struct scsi_device to use as a cursor
356 * @shost: the &struct scsi_host to iterate over
357 *
358 * Iterator that returns each device attached to @shost. This loop
359 * takes a reference on each device and releases it at the end. If
360 * you break out of the loop, you must call scsi_device_put(sdev).
361 */
362#define shost_for_each_device(sdev, shost) \
363 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
364 (sdev); \
365 (sdev) = __scsi_iterate_devices((shost), (sdev)))
366
367/**
368 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
369 * @sdev: the &struct scsi_device to use as a cursor
370 * @shost: the &struct scsi_host to iterate over
371 *
372 * Iterator that returns each device attached to @shost. It does _not_
373 * take a reference on the scsi_device, so the whole loop must be
374 * protected by shost->host_lock.
375 *
376 * Note: The only reason to use this is because you need to access the
377 * device list in interrupt context. Otherwise you really want to use
378 * shost_for_each_device instead.
379 */
380#define __shost_for_each_device(sdev, shost) \
381 list_for_each_entry((sdev), &((shost)->__devices), siblings)
382
383extern int scsi_change_queue_depth(struct scsi_device *, int);
384extern int scsi_track_queue_full(struct scsi_device *, int);
385
386extern int scsi_set_medium_removal(struct scsi_device *, char);
387
388extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
389 unsigned char *buffer, int len, int timeout,
390 int retries, struct scsi_mode_data *data,
391 struct scsi_sense_hdr *);
392extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
393 int modepage, unsigned char *buffer, int len,
394 int timeout, int retries,
395 struct scsi_mode_data *data,
396 struct scsi_sense_hdr *);
397extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
398 int retries, struct scsi_sense_hdr *sshdr);
399extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
400 int buf_len);
401extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
402 unsigned int len, unsigned char opcode);
403extern int scsi_device_set_state(struct scsi_device *sdev,
404 enum scsi_device_state state);
405extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
406 gfp_t gfpflags);
407extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
408extern void sdev_evt_send_simple(struct scsi_device *sdev,
409 enum scsi_device_event evt_type, gfp_t gfpflags);
410extern int scsi_device_quiesce(struct scsi_device *sdev);
411extern void scsi_device_resume(struct scsi_device *sdev);
412extern void scsi_target_quiesce(struct scsi_target *);
413extern void scsi_target_resume(struct scsi_target *);
414extern void scsi_scan_target(struct device *parent, unsigned int channel,
415 unsigned int id, u64 lun,
416 enum scsi_scan_mode rescan);
417extern void scsi_target_reap(struct scsi_target *);
418extern void scsi_target_block(struct device *);
419extern void scsi_target_unblock(struct device *, enum scsi_device_state);
420extern void scsi_remove_target(struct device *);
421extern const char *scsi_device_state_name(enum scsi_device_state);
422extern int scsi_is_sdev_device(const struct device *);
423extern int scsi_is_target_device(const struct device *);
424extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
425extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
426 int data_direction, void *buffer, unsigned bufflen,
427 unsigned char *sense, struct scsi_sense_hdr *sshdr,
428 int timeout, int retries, u64 flags,
429 req_flags_t rq_flags, int *resid);
430static inline int scsi_execute_req(struct scsi_device *sdev,
431 const unsigned char *cmd, int data_direction, void *buffer,
432 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
433 int retries, int *resid)
434{
435 return scsi_execute(sdev, cmd, data_direction, buffer,
436 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid);
437}
438extern void sdev_disable_disk_events(struct scsi_device *sdev);
439extern void sdev_enable_disk_events(struct scsi_device *sdev);
440extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
441extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
442
443#ifdef CONFIG_PM
444extern int scsi_autopm_get_device(struct scsi_device *);
445extern void scsi_autopm_put_device(struct scsi_device *);
446#else
447static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
448static inline void scsi_autopm_put_device(struct scsi_device *d) {}
449#endif /* CONFIG_PM */
450
451static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
452{
453 return device_reprobe(&sdev->sdev_gendev);
454}
455
456static inline unsigned int sdev_channel(struct scsi_device *sdev)
457{
458 return sdev->channel;
459}
460
461static inline unsigned int sdev_id(struct scsi_device *sdev)
462{
463 return sdev->id;
464}
465
466#define scmd_id(scmd) sdev_id((scmd)->device)
467#define scmd_channel(scmd) sdev_channel((scmd)->device)
468
469/*
470 * checks for positions of the SCSI state machine
471 */
472static inline int scsi_device_online(struct scsi_device *sdev)
473{
474 return (sdev->sdev_state != SDEV_OFFLINE &&
475 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
476 sdev->sdev_state != SDEV_DEL);
477}
478static inline int scsi_device_blocked(struct scsi_device *sdev)
479{
480 return sdev->sdev_state == SDEV_BLOCK ||
481 sdev->sdev_state == SDEV_CREATED_BLOCK;
482}
483static inline int scsi_device_created(struct scsi_device *sdev)
484{
485 return sdev->sdev_state == SDEV_CREATED ||
486 sdev->sdev_state == SDEV_CREATED_BLOCK;
487}
488
489int scsi_internal_device_block_nowait(struct scsi_device *sdev);
490int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
491 enum scsi_device_state new_state);
492
493/* accessor functions for the SCSI parameters */
494static inline int scsi_device_sync(struct scsi_device *sdev)
495{
496 return sdev->sdtr;
497}
498static inline int scsi_device_wide(struct scsi_device *sdev)
499{
500 return sdev->wdtr;
501}
502static inline int scsi_device_dt(struct scsi_device *sdev)
503{
504 return sdev->ppr;
505}
506static inline int scsi_device_dt_only(struct scsi_device *sdev)
507{
508 if (sdev->inquiry_len < 57)
509 return 0;
510 return (sdev->inquiry[56] & 0x0c) == 0x04;
511}
512static inline int scsi_device_ius(struct scsi_device *sdev)
513{
514 if (sdev->inquiry_len < 57)
515 return 0;
516 return sdev->inquiry[56] & 0x01;
517}
518static inline int scsi_device_qas(struct scsi_device *sdev)
519{
520 if (sdev->inquiry_len < 57)
521 return 0;
522 return sdev->inquiry[56] & 0x02;
523}
524static inline int scsi_device_enclosure(struct scsi_device *sdev)
525{
526 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
527}
528
529static inline int scsi_device_protection(struct scsi_device *sdev)
530{
531 if (sdev->no_dif)
532 return 0;
533
534 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
535}
536
537static inline int scsi_device_tpgs(struct scsi_device *sdev)
538{
539 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
540}
541
542/**
543 * scsi_device_supports_vpd - test if a device supports VPD pages
544 * @sdev: the &struct scsi_device to test
545 *
546 * If the 'try_vpd_pages' flag is set it takes precedence.
547 * Otherwise we will assume VPD pages are supported if the
548 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
549 */
550static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
551{
552 /* Attempt VPD inquiry if the device blacklist explicitly calls
553 * for it.
554 */
555 if (sdev->try_vpd_pages)
556 return 1;
557 /*
558 * Although VPD inquiries can go to SCSI-2 type devices,
559 * some USB ones crash on receiving them, and the pages
560 * we currently ask for are mandatory for SPC-2 and beyond
561 */
562 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
563 return 1;
564 return 0;
565}
566
567#define MODULE_ALIAS_SCSI_DEVICE(type) \
568 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
569#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
570
571#endif /* _SCSI_SCSI_DEVICE_H */