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192.168.1.100 / T800 / feb6f202200107c1997957b0cdcd1f83784dba9d / . / src / kernel / linux / v4.19 / include / scsi / scsi_device.h
blob: 039e289f295e1a222fb938eba2e5963658c005f0 [file] [log] [blame]
xjb04a4022021-11-25 15:01:52 +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
18typedef __u64 __bitwise blist_flags_t;
19
20#define SCSI_SENSE_BUFFERSIZE 96
21
22struct scsi_mode_data {
23 __u32 length;
24 __u16 block_descriptor_length;
25 __u8 medium_type;
26 __u8 device_specific;
27 __u8 header_length;
28 __u8 longlba:1;
29};
30
31/*
32 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
33 * (for the ascii descriptions) and the state model enforcer:
34 * scsi_lib:scsi_device_set_state().
35 */
36enum scsi_device_state {
37 SDEV_CREATED = 1, /* device created but not added to sysfs
38 * Only internal commands allowed (for inq) */
39 SDEV_RUNNING, /* device properly configured
40 * All commands allowed */
41 SDEV_CANCEL, /* beginning to delete device
42 * Only error handler commands allowed */
43 SDEV_DEL, /* device deleted
44 * no commands allowed */
45 SDEV_QUIESCE, /* Device quiescent. No block commands
46 * will be accepted, only specials (which
47 * originate in the mid-layer) */
48 SDEV_OFFLINE, /* Device offlined (by error handling or
49 * user request */
50 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
51 SDEV_BLOCK, /* Device blocked by scsi lld. No
52 * scsi commands from user or midlayer
53 * should be issued to the scsi
54 * lld. */
55 SDEV_CREATED_BLOCK, /* same as above but for created devices */
56};
57
58enum scsi_scan_mode {
59 SCSI_SCAN_INITIAL = 0,
60 SCSI_SCAN_RESCAN,
61 SCSI_SCAN_MANUAL,
62};
63
64enum scsi_device_event {
65 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
66 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
67 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
68 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
69 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
70 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
71 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
72 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */
73
74 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
75 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED,
76
77 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
78};
79
80struct scsi_event {
81 enum scsi_device_event evt_type;
82 struct list_head node;
83
84 /* put union of data structures, for non-simple event types,
85 * here
86 */
87};
88
89/**
90 * struct scsi_vpd - SCSI Vital Product Data
91 * @rcu: For kfree_rcu().
92 * @len: Length in bytes of @data.
93 * @data: VPD data as defined in various T10 SCSI standard documents.
94 */
95struct scsi_vpd {
96 struct rcu_head rcu;
97 int len;
98 unsigned char data[];
99};
100
101struct scsi_device {
102 struct Scsi_Host *host;
103 struct request_queue *request_queue;
104
105 /* the next two are protected by the host->host_lock */
106 struct list_head siblings; /* list of all devices on this host */
107 struct list_head same_target_siblings; /* just the devices sharing same target id */
108
109 atomic_t device_busy; /* commands actually active on LLDD */
110 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
111
112 spinlock_t list_lock;
113 struct list_head cmd_list; /* queue of in use SCSI Command structures */
114 struct list_head starved_entry;
115 unsigned short queue_depth; /* How deep of a queue we want */
116 unsigned short max_queue_depth; /* max queue depth */
117 unsigned short last_queue_full_depth; /* These two are used by */
118 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
119 unsigned long last_queue_full_time; /* last queue full time */
120 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
121#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
122
123 unsigned long last_queue_ramp_up; /* last queue ramp up time */
124
125 unsigned int id, channel;
126 u64 lun;
127 unsigned int manufacturer; /* Manufacturer of device, for using
128 * vendor-specific cmd's */
129 unsigned sector_size; /* size in bytes */
130
131 void *hostdata; /* available to low-level driver */
132 unsigned char type;
133 char scsi_level;
134 char inq_periph_qual; /* PQ from INQUIRY data */
135 struct mutex inquiry_mutex;
136 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
137 unsigned char * inquiry; /* INQUIRY response data */
138 const char * vendor; /* [back_compat] point into 'inquiry' ... */
139 const char * model; /* ... after scan; point to static string */
140 const char * rev; /* ... "nullnullnullnull" before scan */
141
142#define SCSI_VPD_PG_LEN 255
143 struct scsi_vpd __rcu *vpd_pg83;
144 struct scsi_vpd __rcu *vpd_pg80;
145 unsigned char current_tag; /* current tag */
146 struct scsi_target *sdev_target; /* used only for single_lun */
147
148 blist_flags_t sdev_bflags; /* black/white flags as also found in
149 * scsi_devinfo.[hc]. For now used only to
150 * pass settings from slave_alloc to scsi
151 * core. */
152 unsigned int eh_timeout; /* Error handling timeout */
153 unsigned removable:1;
154 unsigned changed:1; /* Data invalid due to media change */
155 unsigned busy:1; /* Used to prevent races */
156 unsigned lockable:1; /* Able to prevent media removal */
157 unsigned locked:1; /* Media removal disabled */
158 unsigned borken:1; /* Tell the Seagate driver to be
159 * painfully slow on this device */
160 unsigned disconnect:1; /* can disconnect */
161 unsigned soft_reset:1; /* Uses soft reset option */
162 unsigned sdtr:1; /* Device supports SDTR messages */
163 unsigned wdtr:1; /* Device supports WDTR messages */
164 unsigned ppr:1; /* Device supports PPR messages */
165 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
166 unsigned simple_tags:1; /* simple queue tag messages are enabled */
167 unsigned was_reset:1; /* There was a bus reset on the bus for
168 * this device */
169 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
170 * because we did a bus reset. */
171 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
172 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
173 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
174 unsigned no_write_same:1; /* no WRITE SAME command */
175 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
176 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
177 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
178 unsigned skip_vpd_pages:1; /* do not read VPD pages */
179 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
180 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
181 unsigned no_start_on_add:1; /* do not issue start on add */
182 unsigned allow_restart:1; /* issue START_UNIT in error handler */
183 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
184 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
185 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
186 unsigned select_no_atn:1;
187 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
188 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
189 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
190 unsigned last_sector_bug:1; /* do not use multisector accesses on
191 SD_LAST_BUGGY_SECTORS */
192 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
193 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
194 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
195 unsigned security_supported:1; /* Supports Security Protocols */
196 unsigned is_visible:1; /* is the device visible in sysfs */
197 unsigned wce_default_on:1; /* Cache is ON by default */
198 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
199 unsigned broken_fua:1; /* Don't set FUA bit */
200 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
201 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
202 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
203 * creation time */
204 atomic_t disk_events_disable_depth; /* disable depth for disk events */
205
206 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
207 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
208 struct list_head event_list; /* asserted events */
209 struct work_struct event_work;
210
211 unsigned int max_device_blocked; /* what device_blocked counts down from */
212#define SCSI_DEFAULT_DEVICE_BLOCKED 3
213
214 atomic_t iorequest_cnt;
215 atomic_t iodone_cnt;
216 atomic_t ioerr_cnt;
217
218 struct device sdev_gendev,
219 sdev_dev;
220
221 struct execute_work ew; /* used to get process context on put */
222 struct work_struct requeue_work;
223
224 struct scsi_device_handler *handler;
225 void *handler_data;
226
227 unsigned char access_state;
228 struct mutex state_mutex;
229 enum scsi_device_state sdev_state;
230 struct task_struct *quiesced_by;
231 unsigned long sdev_data[0];
232} __attribute__((aligned(sizeof(unsigned long))));
233
234#define to_scsi_device(d) \
235 container_of(d, struct scsi_device, sdev_gendev)
236#define class_to_sdev(d) \
237 container_of(d, struct scsi_device, sdev_dev)
238#define transport_class_to_sdev(class_dev) \
239 to_scsi_device(class_dev->parent)
240
241#define sdev_dbg(sdev, fmt, a...) \
242 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
243
244/*
245 * like scmd_printk, but the device name is passed in
246 * as a string pointer
247 */
248__printf(4, 5) void
249sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
250 const char *, ...);
251
252#define sdev_printk(l, sdev, fmt, a...) \
253 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
254
255__printf(3, 4) void
256scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
257
258#define scmd_dbg(scmd, fmt, a...) \
259 do { \
260 if ((scmd)->request->rq_disk) \
261 sdev_dbg((scmd)->device, "[%s] " fmt, \
262 (scmd)->request->rq_disk->disk_name, ##a);\
263 else \
264 sdev_dbg((scmd)->device, fmt, ##a); \
265 } while (0)
266
267enum scsi_target_state {
268 STARGET_CREATED = 1,
269 STARGET_RUNNING,
270 STARGET_REMOVE,
271 STARGET_CREATED_REMOVE,
272 STARGET_DEL,
273};
274
275/*
276 * scsi_target: representation of a scsi target, for now, this is only
277 * used for single_lun devices. If no one has active IO to the target,
278 * starget_sdev_user is NULL, else it points to the active sdev.
279 */
280struct scsi_target {
281 struct scsi_device *starget_sdev_user;
282 struct list_head siblings;
283 struct list_head devices;
284 struct device dev;
285 struct kref reap_ref; /* last put renders target invisible */
286 unsigned int channel;
287 unsigned int id; /* target id ... replace
288 * scsi_device.id eventually */
289 unsigned int create:1; /* signal that it needs to be added */
290 unsigned int single_lun:1; /* Indicates we should only
291 * allow I/O to one of the luns
292 * for the device at a time. */
293 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
294 * means no lun present. */
295 unsigned int no_report_luns:1; /* Don't use
296 * REPORT LUNS for scanning. */
297 unsigned int expecting_lun_change:1; /* A device has reported
298 * a 3F/0E UA, other devices on
299 * the same target will also. */
300 /* commands actually active on LLD. */
301 atomic_t target_busy;
302 atomic_t target_blocked;
303
304 /*
305 * LLDs should set this in the slave_alloc host template callout.
306 * If set to zero then there is not limit.
307 */
308 unsigned int can_queue;
309 unsigned int max_target_blocked;
310#define SCSI_DEFAULT_TARGET_BLOCKED 3
311
312 char scsi_level;
313 enum scsi_target_state state;
314 void *hostdata; /* available to low-level driver */
315 unsigned long starget_data[0]; /* for the transport */
316 /* starget_data must be the last element!!!! */
317} __attribute__((aligned(sizeof(unsigned long))));
318
319#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
320static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
321{
322 return to_scsi_target(sdev->sdev_gendev.parent);
323}
324#define transport_class_to_starget(class_dev) \
325 to_scsi_target(class_dev->parent)
326
327#define starget_printk(prefix, starget, fmt, a...) \
328 dev_printk(prefix, &(starget)->dev, fmt, ##a)
329
330extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
331 uint, uint, u64, void *hostdata);
332extern int scsi_add_device(struct Scsi_Host *host, uint channel,
333 uint target, u64 lun);
334extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
335extern void scsi_remove_device(struct scsi_device *);
336extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
337void scsi_attach_vpd(struct scsi_device *sdev);
338
339extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
340extern int __must_check scsi_device_get(struct scsi_device *);
341extern void scsi_device_put(struct scsi_device *);
342extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
343 uint, uint, u64);
344extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
345 uint, uint, u64);
346extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
347 u64);
348extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
349 u64);
350extern void starget_for_each_device(struct scsi_target *, void *,
351 void (*fn)(struct scsi_device *, void *));
352extern void __starget_for_each_device(struct scsi_target *, void *,
353 void (*fn)(struct scsi_device *,
354 void *));
355
356/* only exposed to implement shost_for_each_device */
357extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
358 struct scsi_device *);
359
360/**
361 * shost_for_each_device - iterate over all devices of a host
362 * @sdev: the &struct scsi_device to use as a cursor
363 * @shost: the &struct scsi_host to iterate over
364 *
365 * Iterator that returns each device attached to @shost. This loop
366 * takes a reference on each device and releases it at the end. If
367 * you break out of the loop, you must call scsi_device_put(sdev).
368 */
369#define shost_for_each_device(sdev, shost) \
370 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
371 (sdev); \
372 (sdev) = __scsi_iterate_devices((shost), (sdev)))
373
374/**
375 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
376 * @sdev: the &struct scsi_device to use as a cursor
377 * @shost: the &struct scsi_host to iterate over
378 *
379 * Iterator that returns each device attached to @shost. It does _not_
380 * take a reference on the scsi_device, so the whole loop must be
381 * protected by shost->host_lock.
382 *
383 * Note: The only reason to use this is because you need to access the
384 * device list in interrupt context. Otherwise you really want to use
385 * shost_for_each_device instead.
386 */
387#define __shost_for_each_device(sdev, shost) \
388 list_for_each_entry((sdev), &((shost)->__devices), siblings)
389
390extern int scsi_change_queue_depth(struct scsi_device *, int);
391extern int scsi_track_queue_full(struct scsi_device *, int);
392
393extern int scsi_set_medium_removal(struct scsi_device *, char);
394
395extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
396 unsigned char *buffer, int len, int timeout,
397 int retries, struct scsi_mode_data *data,
398 struct scsi_sense_hdr *);
399extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
400 int modepage, unsigned char *buffer, int len,
401 int timeout, int retries,
402 struct scsi_mode_data *data,
403 struct scsi_sense_hdr *);
404extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
405 int retries, struct scsi_sense_hdr *sshdr);
406extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
407 int buf_len);
408extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
409 unsigned int len, unsigned char opcode);
410extern int scsi_device_set_state(struct scsi_device *sdev,
411 enum scsi_device_state state);
412extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
413 gfp_t gfpflags);
414extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
415extern void sdev_evt_send_simple(struct scsi_device *sdev,
416 enum scsi_device_event evt_type, gfp_t gfpflags);
417extern int scsi_device_quiesce(struct scsi_device *sdev);
418extern void scsi_device_resume(struct scsi_device *sdev);
419extern void scsi_target_quiesce(struct scsi_target *);
420extern void scsi_target_resume(struct scsi_target *);
421extern void scsi_scan_target(struct device *parent, unsigned int channel,
422 unsigned int id, u64 lun,
423 enum scsi_scan_mode rescan);
424extern void scsi_target_reap(struct scsi_target *);
425extern void scsi_target_block(struct device *);
426extern void scsi_target_unblock(struct device *, enum scsi_device_state);
427extern void scsi_remove_target(struct device *);
428extern const char *scsi_device_state_name(enum scsi_device_state);
429extern int scsi_is_sdev_device(const struct device *);
430extern int scsi_is_target_device(const struct device *);
431extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
432extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
433 int data_direction, void *buffer, unsigned bufflen,
434 unsigned char *sense, struct scsi_sense_hdr *sshdr,
435 int timeout, int retries, u64 flags,
436 req_flags_t rq_flags, int *resid);
437/* Make sure any sense buffer is the correct size. */
438#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
439 sshdr, timeout, retries, flags, rq_flags, resid) \
440({ \
441 BUILD_BUG_ON((sense) != NULL && \
442 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \
443 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \
444 sense, sshdr, timeout, retries, flags, rq_flags, \
445 resid); \
446})
447static inline int scsi_execute_req(struct scsi_device *sdev,
448 const unsigned char *cmd, int data_direction, void *buffer,
449 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
450 int retries, int *resid)
451{
452 return scsi_execute(sdev, cmd, data_direction, buffer,
453 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid);
454}
455extern void sdev_disable_disk_events(struct scsi_device *sdev);
456extern void sdev_enable_disk_events(struct scsi_device *sdev);
457extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
458extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
459
460#ifdef CONFIG_PM
461extern int scsi_autopm_get_device(struct scsi_device *);
462extern void scsi_autopm_put_device(struct scsi_device *);
463#else
464static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
465static inline void scsi_autopm_put_device(struct scsi_device *d) {}
466#endif /* CONFIG_PM */
467
468static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
469{
470 return device_reprobe(&sdev->sdev_gendev);
471}
472
473static inline unsigned int sdev_channel(struct scsi_device *sdev)
474{
475 return sdev->channel;
476}
477
478static inline unsigned int sdev_id(struct scsi_device *sdev)
479{
480 return sdev->id;
481}
482
483#define scmd_id(scmd) sdev_id((scmd)->device)
484#define scmd_channel(scmd) sdev_channel((scmd)->device)
485
486/*
487 * checks for positions of the SCSI state machine
488 */
489static inline int scsi_device_online(struct scsi_device *sdev)
490{
491 return (sdev->sdev_state != SDEV_OFFLINE &&
492 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
493 sdev->sdev_state != SDEV_DEL);
494}
495static inline int scsi_device_blocked(struct scsi_device *sdev)
496{
497 return sdev->sdev_state == SDEV_BLOCK ||
498 sdev->sdev_state == SDEV_CREATED_BLOCK;
499}
500static inline int scsi_device_created(struct scsi_device *sdev)
501{
502 return sdev->sdev_state == SDEV_CREATED ||
503 sdev->sdev_state == SDEV_CREATED_BLOCK;
504}
505
506int scsi_internal_device_block_nowait(struct scsi_device *sdev);
507int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
508 enum scsi_device_state new_state);
509
510/* accessor functions for the SCSI parameters */
511static inline int scsi_device_sync(struct scsi_device *sdev)
512{
513 return sdev->sdtr;
514}
515static inline int scsi_device_wide(struct scsi_device *sdev)
516{
517 return sdev->wdtr;
518}
519static inline int scsi_device_dt(struct scsi_device *sdev)
520{
521 return sdev->ppr;
522}
523static inline int scsi_device_dt_only(struct scsi_device *sdev)
524{
525 if (sdev->inquiry_len < 57)
526 return 0;
527 return (sdev->inquiry[56] & 0x0c) == 0x04;
528}
529static inline int scsi_device_ius(struct scsi_device *sdev)
530{
531 if (sdev->inquiry_len < 57)
532 return 0;
533 return sdev->inquiry[56] & 0x01;
534}
535static inline int scsi_device_qas(struct scsi_device *sdev)
536{
537 if (sdev->inquiry_len < 57)
538 return 0;
539 return sdev->inquiry[56] & 0x02;
540}
541static inline int scsi_device_enclosure(struct scsi_device *sdev)
542{
543 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
544}
545
546static inline int scsi_device_protection(struct scsi_device *sdev)
547{
548 if (sdev->no_dif)
549 return 0;
550
551 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
552}
553
554static inline int scsi_device_tpgs(struct scsi_device *sdev)
555{
556 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
557}
558
559/**
560 * scsi_device_supports_vpd - test if a device supports VPD pages
561 * @sdev: the &struct scsi_device to test
562 *
563 * If the 'try_vpd_pages' flag is set it takes precedence.
564 * Otherwise we will assume VPD pages are supported if the
565 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
566 */
567static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
568{
569 /* Attempt VPD inquiry if the device blacklist explicitly calls
570 * for it.
571 */
572 if (sdev->try_vpd_pages)
573 return 1;
574 /*
575 * Although VPD inquiries can go to SCSI-2 type devices,
576 * some USB ones crash on receiving them, and the pages
577 * we currently ask for are mandatory for SPC-2 and beyond
578 */
579 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
580 return 1;
581 return 0;
582}
583
584#define MODULE_ALIAS_SCSI_DEVICE(type) \
585 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
586#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
587
588#endif /* _SCSI_SCSI_DEVICE_H */