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/blk-mq.h>
9#include <scsi/scsi.h>
10#include <linux/atomic.h>
11#include <linux/sbitmap.h>
12
13struct bsg_device;
14struct device;
15struct request_queue;
16struct scsi_cmnd;
17struct scsi_lun;
18struct scsi_sense_hdr;
19
20typedef __u64 __bitwise blist_flags_t;
21
22#define SCSI_SENSE_BUFFERSIZE 96
23
24struct scsi_mode_data {
25 __u32 length;
26 __u16 block_descriptor_length;
27 __u8 medium_type;
28 __u8 device_specific;
29 __u8 header_length;
30 __u8 longlba:1;
31};
32
33/*
34 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
35 * (for the ascii descriptions) and the state model enforcer:
36 * scsi_lib:scsi_device_set_state().
37 */
38enum scsi_device_state {
39 SDEV_CREATED = 1, /* device created but not added to sysfs
40 * Only internal commands allowed (for inq) */
41 SDEV_RUNNING, /* device properly configured
42 * All commands allowed */
43 SDEV_CANCEL, /* beginning to delete device
44 * Only error handler commands allowed */
45 SDEV_DEL, /* device deleted
46 * no commands allowed */
47 SDEV_QUIESCE, /* Device quiescent. No block commands
48 * will be accepted, only specials (which
49 * originate in the mid-layer) */
50 SDEV_OFFLINE, /* Device offlined (by error handling or
51 * user request */
52 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
53 SDEV_BLOCK, /* Device blocked by scsi lld. No
54 * scsi commands from user or midlayer
55 * should be issued to the scsi
56 * lld. */
57 SDEV_CREATED_BLOCK, /* same as above but for created devices */
58};
59
60enum scsi_scan_mode {
61 SCSI_SCAN_INITIAL = 0,
62 SCSI_SCAN_RESCAN,
63 SCSI_SCAN_MANUAL,
64};
65
66enum scsi_device_event {
67 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
68 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
69 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
70 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
71 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
72 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
73 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
74 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */
75
76 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
77 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED,
78
79 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
80};
81
82struct scsi_event {
83 enum scsi_device_event evt_type;
84 struct list_head node;
85
86 /* put union of data structures, for non-simple event types,
87 * here
88 */
89};
90
91/**
92 * struct scsi_vpd - SCSI Vital Product Data
93 * @rcu: For kfree_rcu().
94 * @len: Length in bytes of @data.
95 * @data: VPD data as defined in various T10 SCSI standard documents.
96 */
97struct scsi_vpd {
98 struct rcu_head rcu;
99 int len;
100 unsigned char data[];
101};
102
103enum scsi_vpd_parameters {
104 SCSI_VPD_HEADER_SIZE = 4,
105};
106
107struct scsi_device {
108 struct Scsi_Host *host;
109 struct request_queue *request_queue;
110
111 /* the next two are protected by the host->host_lock */
112 struct list_head siblings; /* list of all devices on this host */
113 struct list_head same_target_siblings; /* just the devices sharing same target id */
114
115 struct sbitmap budget_map;
116 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
117
118 atomic_t restarts;
119 spinlock_t list_lock;
120 struct list_head starved_entry;
121 unsigned short queue_depth; /* How deep of a queue we want */
122 unsigned short max_queue_depth; /* max queue depth */
123 unsigned short last_queue_full_depth; /* These two are used by */
124 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
125 unsigned long last_queue_full_time; /* last queue full time */
126 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
127#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
128
129 unsigned long last_queue_ramp_up; /* last queue ramp up time */
130
131 unsigned int id, channel;
132 u64 lun;
133 unsigned int manufacturer; /* Manufacturer of device, for using
134 * vendor-specific cmd's */
135 unsigned sector_size; /* size in bytes */
136
137 void *hostdata; /* available to low-level driver */
138 unsigned char type;
139 char scsi_level;
140 char inq_periph_qual; /* PQ from INQUIRY data */
141 struct mutex inquiry_mutex;
142 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
143 unsigned char * inquiry; /* INQUIRY response data */
144 const char * vendor; /* [back_compat] point into 'inquiry' ... */
145 const char * model; /* ... after scan; point to static string */
146 const char * rev; /* ... "nullnullnullnull" before scan */
147
148#define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */
149 struct scsi_vpd __rcu *vpd_pg0;
150 struct scsi_vpd __rcu *vpd_pg83;
151 struct scsi_vpd __rcu *vpd_pg80;
152 struct scsi_vpd __rcu *vpd_pg89;
153 struct scsi_vpd __rcu *vpd_pgb0;
154 struct scsi_vpd __rcu *vpd_pgb1;
155 struct scsi_vpd __rcu *vpd_pgb2;
156
157 struct scsi_target *sdev_target;
158
159 blist_flags_t sdev_bflags; /* black/white flags as also found in
160 * scsi_devinfo.[hc]. For now used only to
161 * pass settings from slave_alloc to scsi
162 * core. */
163 unsigned int eh_timeout; /* Error handling timeout */
164
165 /*
166 * If true, let the high-level device driver (sd) manage the device
167 * power state for system suspend/resume (suspend to RAM and
168 * hibernation) operations.
169 */
170 bool manage_system_start_stop;
171
172 /*
173 * If true, let the high-level device driver (sd) manage the device
174 * power state for runtime device suspand and resume operations.
175 */
176 bool manage_runtime_start_stop;
177
178 /*
179 * If true, let the high-level device driver (sd) manage the device
180 * power state for system shutdown (power off) operations.
181 */
182 bool manage_shutdown;
183
184 unsigned removable:1;
185 unsigned changed:1; /* Data invalid due to media change */
186 unsigned busy:1; /* Used to prevent races */
187 unsigned lockable:1; /* Able to prevent media removal */
188 unsigned locked:1; /* Media removal disabled */
189 unsigned borken:1; /* Tell the Seagate driver to be
190 * painfully slow on this device */
191 unsigned disconnect:1; /* can disconnect */
192 unsigned soft_reset:1; /* Uses soft reset option */
193 unsigned sdtr:1; /* Device supports SDTR messages */
194 unsigned wdtr:1; /* Device supports WDTR messages */
195 unsigned ppr:1; /* Device supports PPR messages */
196 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
197 unsigned simple_tags:1; /* simple queue tag messages are enabled */
198 unsigned was_reset:1; /* There was a bus reset on the bus for
199 * this device */
200 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
201 * because we did a bus reset. */
202 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
203 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
204 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
205 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
206 unsigned no_write_same:1; /* no WRITE SAME command */
207 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
208 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */
209 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
210 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
211 unsigned skip_vpd_pages:1; /* do not read VPD pages */
212 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
213 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
214 unsigned no_start_on_add:1; /* do not issue start on add */
215 unsigned allow_restart:1; /* issue START_UNIT in error handler */
216 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
217 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
218 unsigned select_no_atn:1;
219 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
220 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
221 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
222 unsigned last_sector_bug:1; /* do not use multisector accesses on
223 SD_LAST_BUGGY_SECTORS */
224 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
225 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
226 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
227 unsigned security_supported:1; /* Supports Security Protocols */
228 unsigned is_visible:1; /* is the device visible in sysfs */
229 unsigned wce_default_on:1; /* Cache is ON by default */
230 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
231 unsigned broken_fua:1; /* Don't set FUA bit */
232 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
233 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
234 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
235 * creation time */
236 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
237 unsigned silence_suspend:1; /* Do not print runtime PM related messages */
238 unsigned no_vpd_size:1; /* No VPD size reported in header */
239
240 unsigned cdl_supported:1; /* Command duration limits supported */
241 unsigned cdl_enable:1; /* Enable/disable Command duration limits */
242
243 unsigned int queue_stopped; /* request queue is quiesced */
244 bool offline_already; /* Device offline message logged */
245
246 atomic_t disk_events_disable_depth; /* disable depth for disk events */
247
248 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
249 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
250 struct list_head event_list; /* asserted events */
251 struct work_struct event_work;
252
253 unsigned int max_device_blocked; /* what device_blocked counts down from */
254#define SCSI_DEFAULT_DEVICE_BLOCKED 3
255
256 atomic_t iorequest_cnt;
257 atomic_t iodone_cnt;
258 atomic_t ioerr_cnt;
259 atomic_t iotmo_cnt;
260
261 struct device sdev_gendev,
262 sdev_dev;
263
264 struct work_struct requeue_work;
265
266 struct scsi_device_handler *handler;
267 void *handler_data;
268
269 size_t dma_drain_len;
270 void *dma_drain_buf;
271
272 unsigned int sg_timeout;
273 unsigned int sg_reserved_size;
274
275 struct bsg_device *bsg_dev;
276 unsigned char access_state;
277 struct mutex state_mutex;
278 enum scsi_device_state sdev_state;
279 struct task_struct *quiesced_by;
280 unsigned long sdev_data[];
281} __attribute__((aligned(sizeof(unsigned long))));
282
283#define to_scsi_device(d) \
284 container_of(d, struct scsi_device, sdev_gendev)
285#define class_to_sdev(d) \
286 container_of(d, struct scsi_device, sdev_dev)
287#define transport_class_to_sdev(class_dev) \
288 to_scsi_device(class_dev->parent)
289
290#define sdev_dbg(sdev, fmt, a...) \
291 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
292
293/*
294 * like scmd_printk, but the device name is passed in
295 * as a string pointer
296 */
297__printf(4, 5) void
298sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
299 const char *, ...);
300
301#define sdev_printk(l, sdev, fmt, a...) \
302 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
303
304__printf(3, 4) void
305scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
306
307#define scmd_dbg(scmd, fmt, a...) \
308 do { \
309 struct request *__rq = scsi_cmd_to_rq((scmd)); \
310 \
311 if (__rq->q->disk) \
312 sdev_dbg((scmd)->device, "[%s] " fmt, \
313 __rq->q->disk->disk_name, ##a); \
314 else \
315 sdev_dbg((scmd)->device, fmt, ##a); \
316 } while (0)
317
318enum scsi_target_state {
319 STARGET_CREATED = 1,
320 STARGET_RUNNING,
321 STARGET_REMOVE,
322 STARGET_CREATED_REMOVE,
323 STARGET_DEL,
324};
325
326/*
327 * scsi_target: representation of a scsi target, for now, this is only
328 * used for single_lun devices. If no one has active IO to the target,
329 * starget_sdev_user is NULL, else it points to the active sdev.
330 */
331struct scsi_target {
332 struct scsi_device *starget_sdev_user;
333 struct list_head siblings;
334 struct list_head devices;
335 struct device dev;
336 struct kref reap_ref; /* last put renders target invisible */
337 unsigned int channel;
338 unsigned int id; /* target id ... replace
339 * scsi_device.id eventually */
340 unsigned int create:1; /* signal that it needs to be added */
341 unsigned int single_lun:1; /* Indicates we should only
342 * allow I/O to one of the luns
343 * for the device at a time. */
344 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
345 * means no lun present. */
346 unsigned int no_report_luns:1; /* Don't use
347 * REPORT LUNS for scanning. */
348 unsigned int expecting_lun_change:1; /* A device has reported
349 * a 3F/0E UA, other devices on
350 * the same target will also. */
351 /* commands actually active on LLD. */
352 atomic_t target_busy;
353 atomic_t target_blocked;
354
355 /*
356 * LLDs should set this in the slave_alloc host template callout.
357 * If set to zero then there is not limit.
358 */
359 unsigned int can_queue;
360 unsigned int max_target_blocked;
361#define SCSI_DEFAULT_TARGET_BLOCKED 3
362
363 char scsi_level;
364 enum scsi_target_state state;
365 void *hostdata; /* available to low-level driver */
366 unsigned long starget_data[]; /* for the transport */
367 /* starget_data must be the last element!!!! */
368} __attribute__((aligned(sizeof(unsigned long))));
369
370#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
371static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
372{
373 return to_scsi_target(sdev->sdev_gendev.parent);
374}
375#define transport_class_to_starget(class_dev) \
376 to_scsi_target(class_dev->parent)
377
378#define starget_printk(prefix, starget, fmt, a...) \
379 dev_printk(prefix, &(starget)->dev, fmt, ##a)
380
381extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
382 uint, uint, u64, void *hostdata);
383extern int scsi_add_device(struct Scsi_Host *host, uint channel,
384 uint target, u64 lun);
385extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
386extern void scsi_remove_device(struct scsi_device *);
387extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
388void scsi_attach_vpd(struct scsi_device *sdev);
389void scsi_cdl_check(struct scsi_device *sdev);
390int scsi_cdl_enable(struct scsi_device *sdev, bool enable);
391
392extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
393extern int __must_check scsi_device_get(struct scsi_device *);
394extern void scsi_device_put(struct scsi_device *);
395extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
396 uint, uint, u64);
397extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
398 uint, uint, u64);
399extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
400 u64);
401extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
402 u64);
403extern void starget_for_each_device(struct scsi_target *, void *,
404 void (*fn)(struct scsi_device *, void *));
405extern void __starget_for_each_device(struct scsi_target *, void *,
406 void (*fn)(struct scsi_device *,
407 void *));
408
409/* only exposed to implement shost_for_each_device */
410extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
411 struct scsi_device *);
412
413/**
414 * shost_for_each_device - iterate over all devices of a host
415 * @sdev: the &struct scsi_device to use as a cursor
416 * @shost: the &struct scsi_host to iterate over
417 *
418 * Iterator that returns each device attached to @shost. This loop
419 * takes a reference on each device and releases it at the end. If
420 * you break out of the loop, you must call scsi_device_put(sdev).
421 */
422#define shost_for_each_device(sdev, shost) \
423 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
424 (sdev); \
425 (sdev) = __scsi_iterate_devices((shost), (sdev)))
426
427/**
428 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
429 * @sdev: the &struct scsi_device to use as a cursor
430 * @shost: the &struct scsi_host to iterate over
431 *
432 * Iterator that returns each device attached to @shost. It does _not_
433 * take a reference on the scsi_device, so the whole loop must be
434 * protected by shost->host_lock.
435 *
436 * Note: The only reason to use this is because you need to access the
437 * device list in interrupt context. Otherwise you really want to use
438 * shost_for_each_device instead.
439 */
440#define __shost_for_each_device(sdev, shost) \
441 list_for_each_entry((sdev), &((shost)->__devices), siblings)
442
443extern int scsi_change_queue_depth(struct scsi_device *, int);
444extern int scsi_track_queue_full(struct scsi_device *, int);
445
446extern int scsi_set_medium_removal(struct scsi_device *, char);
447
448int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
449 int subpage, unsigned char *buffer, int len, int timeout,
450 int retries, struct scsi_mode_data *data,
451 struct scsi_sense_hdr *);
452extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
453 unsigned char *buffer, int len, int timeout,
454 int retries, struct scsi_mode_data *data,
455 struct scsi_sense_hdr *);
456extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
457 int retries, struct scsi_sense_hdr *sshdr);
458extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
459 int buf_len);
460int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
461 unsigned int len, unsigned char opcode,
462 unsigned short sa);
463extern int scsi_device_set_state(struct scsi_device *sdev,
464 enum scsi_device_state state);
465extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
466 gfp_t gfpflags);
467extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
468extern void sdev_evt_send_simple(struct scsi_device *sdev,
469 enum scsi_device_event evt_type, gfp_t gfpflags);
470extern int scsi_device_quiesce(struct scsi_device *sdev);
471extern void scsi_device_resume(struct scsi_device *sdev);
472extern void scsi_target_quiesce(struct scsi_target *);
473extern void scsi_target_resume(struct scsi_target *);
474extern void scsi_scan_target(struct device *parent, unsigned int channel,
475 unsigned int id, u64 lun,
476 enum scsi_scan_mode rescan);
477extern void scsi_target_reap(struct scsi_target *);
478void scsi_block_targets(struct Scsi_Host *shost, struct device *dev);
479extern void scsi_target_unblock(struct device *, enum scsi_device_state);
480extern void scsi_remove_target(struct device *);
481extern const char *scsi_device_state_name(enum scsi_device_state);
482extern int scsi_is_sdev_device(const struct device *);
483extern int scsi_is_target_device(const struct device *);
484extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
485
486/* Optional arguments to scsi_execute_cmd */
487struct scsi_exec_args {
488 unsigned char *sense; /* sense buffer */
489 unsigned int sense_len; /* sense buffer len */
490 struct scsi_sense_hdr *sshdr; /* decoded sense header */
491 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */
492 int scmd_flags; /* SCMD flags */
493 int *resid; /* residual length */
494};
495
496int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
497 blk_opf_t opf, void *buffer, unsigned int bufflen,
498 int timeout, int retries,
499 const struct scsi_exec_args *args);
500
501extern void sdev_disable_disk_events(struct scsi_device *sdev);
502extern void sdev_enable_disk_events(struct scsi_device *sdev);
503extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
504extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
505
506#ifdef CONFIG_PM
507extern int scsi_autopm_get_device(struct scsi_device *);
508extern void scsi_autopm_put_device(struct scsi_device *);
509#else
510static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
511static inline void scsi_autopm_put_device(struct scsi_device *d) {}
512#endif /* CONFIG_PM */
513
514static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
515{
516 return device_reprobe(dev: &sdev->sdev_gendev);
517}
518
519static inline unsigned int sdev_channel(struct scsi_device *sdev)
520{
521 return sdev->channel;
522}
523
524static inline unsigned int sdev_id(struct scsi_device *sdev)
525{
526 return sdev->id;
527}
528
529#define scmd_id(scmd) sdev_id((scmd)->device)
530#define scmd_channel(scmd) sdev_channel((scmd)->device)
531
532/*
533 * checks for positions of the SCSI state machine
534 */
535static inline int scsi_device_online(struct scsi_device *sdev)
536{
537 return (sdev->sdev_state != SDEV_OFFLINE &&
538 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
539 sdev->sdev_state != SDEV_DEL);
540}
541static inline int scsi_device_blocked(struct scsi_device *sdev)
542{
543 return sdev->sdev_state == SDEV_BLOCK ||
544 sdev->sdev_state == SDEV_CREATED_BLOCK;
545}
546static inline int scsi_device_created(struct scsi_device *sdev)
547{
548 return sdev->sdev_state == SDEV_CREATED ||
549 sdev->sdev_state == SDEV_CREATED_BLOCK;
550}
551
552int scsi_internal_device_block_nowait(struct scsi_device *sdev);
553int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
554 enum scsi_device_state new_state);
555
556/* accessor functions for the SCSI parameters */
557static inline int scsi_device_sync(struct scsi_device *sdev)
558{
559 return sdev->sdtr;
560}
561static inline int scsi_device_wide(struct scsi_device *sdev)
562{
563 return sdev->wdtr;
564}
565static inline int scsi_device_dt(struct scsi_device *sdev)
566{
567 return sdev->ppr;
568}
569static inline int scsi_device_dt_only(struct scsi_device *sdev)
570{
571 if (sdev->inquiry_len < 57)
572 return 0;
573 return (sdev->inquiry[56] & 0x0c) == 0x04;
574}
575static inline int scsi_device_ius(struct scsi_device *sdev)
576{
577 if (sdev->inquiry_len < 57)
578 return 0;
579 return sdev->inquiry[56] & 0x01;
580}
581static inline int scsi_device_qas(struct scsi_device *sdev)
582{
583 if (sdev->inquiry_len < 57)
584 return 0;
585 return sdev->inquiry[56] & 0x02;
586}
587static inline int scsi_device_enclosure(struct scsi_device *sdev)
588{
589 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
590}
591
592static inline int scsi_device_protection(struct scsi_device *sdev)
593{
594 if (sdev->no_dif)
595 return 0;
596
597 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
598}
599
600static inline int scsi_device_tpgs(struct scsi_device *sdev)
601{
602 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
603}
604
605/**
606 * scsi_device_supports_vpd - test if a device supports VPD pages
607 * @sdev: the &struct scsi_device to test
608 *
609 * If the 'try_vpd_pages' flag is set it takes precedence.
610 * Otherwise we will assume VPD pages are supported if the
611 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
612 */
613static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
614{
615 /* Attempt VPD inquiry if the device blacklist explicitly calls
616 * for it.
617 */
618 if (sdev->try_vpd_pages)
619 return 1;
620 /*
621 * Although VPD inquiries can go to SCSI-2 type devices,
622 * some USB ones crash on receiving them, and the pages
623 * we currently ask for are mandatory for SPC-2 and beyond
624 */
625 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
626 return 1;
627 return 0;
628}
629
630static inline int scsi_device_busy(struct scsi_device *sdev)
631{
632 return sbitmap_weight(sb: &sdev->budget_map);
633}
634
635#define MODULE_ALIAS_SCSI_DEVICE(type) \
636 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
637#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
638
639#endif /* _SCSI_SCSI_DEVICE_H */
640

source code of linux/include/scsi/scsi_device.h