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