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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/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 struct scsi_vpd __rcu *vpd_pg0;
149 struct scsi_vpd __rcu *vpd_pg83;
150 struct scsi_vpd __rcu *vpd_pg80;
151 struct scsi_vpd __rcu *vpd_pg89;
152 struct scsi_vpd __rcu *vpd_pgb0;
153 struct scsi_vpd __rcu *vpd_pgb1;
154 struct scsi_vpd __rcu *vpd_pgb2;
155
156 struct scsi_target *sdev_target;
157
158 blist_flags_t sdev_bflags; /* black/white flags as also found in
159 * scsi_devinfo.[hc]. For now used only to
160 * pass settings from slave_alloc to scsi
161 * core. */
162 unsigned int eh_timeout; /* Error handling timeout */
163 unsigned removable:1;
164 unsigned changed:1; /* Data invalid due to media change */
165 unsigned busy:1; /* Used to prevent races */
166 unsigned lockable:1; /* Able to prevent media removal */
167 unsigned locked:1; /* Media removal disabled */
168 unsigned borken:1; /* Tell the Seagate driver to be
169 * painfully slow on this device */
170 unsigned disconnect:1; /* can disconnect */
171 unsigned soft_reset:1; /* Uses soft reset option */
172 unsigned sdtr:1; /* Device supports SDTR messages */
173 unsigned wdtr:1; /* Device supports WDTR messages */
174 unsigned ppr:1; /* Device supports PPR messages */
175 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
176 unsigned simple_tags:1; /* simple queue tag messages are enabled */
177 unsigned was_reset:1; /* There was a bus reset on the bus for
178 * this device */
179 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
180 * because we did a bus reset. */
181 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
182 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
183 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
184 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
185 unsigned no_write_same:1; /* no WRITE SAME command */
186 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
187 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */
188 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
189 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
190 unsigned skip_vpd_pages:1; /* do not read VPD pages */
191 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
192 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
193 unsigned no_start_on_add:1; /* do not issue start on add */
194 unsigned allow_restart:1; /* issue START_UNIT in error handler */
195 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
196 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
197 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
198 unsigned select_no_atn:1;
199 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
200 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
201 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
202 unsigned last_sector_bug:1; /* do not use multisector accesses on
203 SD_LAST_BUGGY_SECTORS */
204 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
205 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
206 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
207 unsigned security_supported:1; /* Supports Security Protocols */
208 unsigned is_visible:1; /* is the device visible in sysfs */
209 unsigned wce_default_on:1; /* Cache is ON by default */
210 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
211 unsigned broken_fua:1; /* Don't set FUA bit */
212 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
213 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
214 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
215 * creation time */
216 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
217 unsigned silence_suspend:1; /* Do not print runtime PM related messages */
218
219 unsigned int queue_stopped; /* request queue is quiesced */
220 bool offline_already; /* Device offline message logged */
221
222 atomic_t disk_events_disable_depth; /* disable depth for disk events */
223
224 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
225 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
226 struct list_head event_list; /* asserted events */
227 struct work_struct event_work;
228
229 unsigned int max_device_blocked; /* what device_blocked counts down from */
230#define SCSI_DEFAULT_DEVICE_BLOCKED 3
231
232 atomic_t iorequest_cnt;
233 atomic_t iodone_cnt;
234 atomic_t ioerr_cnt;
235 atomic_t iotmo_cnt;
236
237 struct device sdev_gendev,
238 sdev_dev;
239
240 struct work_struct requeue_work;
241
242 struct scsi_device_handler *handler;
243 void *handler_data;
244
245 size_t dma_drain_len;
246 void *dma_drain_buf;
247
248 unsigned int sg_timeout;
249 unsigned int sg_reserved_size;
250
251 struct bsg_device *bsg_dev;
252 unsigned char access_state;
253 struct mutex state_mutex;
254 enum scsi_device_state sdev_state;
255 struct task_struct *quiesced_by;
256 unsigned long sdev_data[];
257} __attribute__((aligned(sizeof(unsigned long))));
258
259#define to_scsi_device(d) \
260 container_of(d, struct scsi_device, sdev_gendev)
261#define class_to_sdev(d) \
262 container_of(d, struct scsi_device, sdev_dev)
263#define transport_class_to_sdev(class_dev) \
264 to_scsi_device(class_dev->parent)
265
266#define sdev_dbg(sdev, fmt, a...) \
267 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
268
269/*
270 * like scmd_printk, but the device name is passed in
271 * as a string pointer
272 */
273__printf(4, 5) void
274sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
275 const char *, ...);
276
277#define sdev_printk(l, sdev, fmt, a...) \
278 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
279
280__printf(3, 4) void
281scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
282
283#define scmd_dbg(scmd, fmt, a...) \
284 do { \
285 struct request *__rq = scsi_cmd_to_rq((scmd)); \
286 \
287 if (__rq->q->disk) \
288 sdev_dbg((scmd)->device, "[%s] " fmt, \
289 __rq->q->disk->disk_name, ##a); \
290 else \
291 sdev_dbg((scmd)->device, fmt, ##a); \
292 } while (0)
293
294enum scsi_target_state {
295 STARGET_CREATED = 1,
296 STARGET_RUNNING,
297 STARGET_REMOVE,
298 STARGET_CREATED_REMOVE,
299 STARGET_DEL,
300};
301
302/*
303 * scsi_target: representation of a scsi target, for now, this is only
304 * used for single_lun devices. If no one has active IO to the target,
305 * starget_sdev_user is NULL, else it points to the active sdev.
306 */
307struct scsi_target {
308 struct scsi_device *starget_sdev_user;
309 struct list_head siblings;
310 struct list_head devices;
311 struct device dev;
312 struct kref reap_ref; /* last put renders target invisible */
313 unsigned int channel;
314 unsigned int id; /* target id ... replace
315 * scsi_device.id eventually */
316 unsigned int create:1; /* signal that it needs to be added */
317 unsigned int single_lun:1; /* Indicates we should only
318 * allow I/O to one of the luns
319 * for the device at a time. */
320 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
321 * means no lun present. */
322 unsigned int no_report_luns:1; /* Don't use
323 * REPORT LUNS for scanning. */
324 unsigned int expecting_lun_change:1; /* A device has reported
325 * a 3F/0E UA, other devices on
326 * the same target will also. */
327 /* commands actually active on LLD. */
328 atomic_t target_busy;
329 atomic_t target_blocked;
330
331 /*
332 * LLDs should set this in the slave_alloc host template callout.
333 * If set to zero then there is not limit.
334 */
335 unsigned int can_queue;
336 unsigned int max_target_blocked;
337#define SCSI_DEFAULT_TARGET_BLOCKED 3
338
339 char scsi_level;
340 enum scsi_target_state state;
341 void *hostdata; /* available to low-level driver */
342 unsigned long starget_data[]; /* for the transport */
343 /* starget_data must be the last element!!!! */
344} __attribute__((aligned(sizeof(unsigned long))));
345
346#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
347static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
348{
349 return to_scsi_target(sdev->sdev_gendev.parent);
350}
351#define transport_class_to_starget(class_dev) \
352 to_scsi_target(class_dev->parent)
353
354#define starget_printk(prefix, starget, fmt, a...) \
355 dev_printk(prefix, &(starget)->dev, fmt, ##a)
356
357extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
358 uint, uint, u64, void *hostdata);
359extern int scsi_add_device(struct Scsi_Host *host, uint channel,
360 uint target, u64 lun);
361extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
362extern void scsi_remove_device(struct scsi_device *);
363extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
364void scsi_attach_vpd(struct scsi_device *sdev);
365
366extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
367extern int __must_check scsi_device_get(struct scsi_device *);
368extern void scsi_device_put(struct scsi_device *);
369extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
370 uint, uint, u64);
371extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
372 uint, uint, u64);
373extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
374 u64);
375extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
376 u64);
377extern void starget_for_each_device(struct scsi_target *, void *,
378 void (*fn)(struct scsi_device *, void *));
379extern void __starget_for_each_device(struct scsi_target *, void *,
380 void (*fn)(struct scsi_device *,
381 void *));
382
383/* only exposed to implement shost_for_each_device */
384extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
385 struct scsi_device *);
386
387/**
388 * shost_for_each_device - iterate over all devices of a host
389 * @sdev: the &struct scsi_device to use as a cursor
390 * @shost: the &struct scsi_host to iterate over
391 *
392 * Iterator that returns each device attached to @shost. This loop
393 * takes a reference on each device and releases it at the end. If
394 * you break out of the loop, you must call scsi_device_put(sdev).
395 */
396#define shost_for_each_device(sdev, shost) \
397 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
398 (sdev); \
399 (sdev) = __scsi_iterate_devices((shost), (sdev)))
400
401/**
402 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
403 * @sdev: the &struct scsi_device to use as a cursor
404 * @shost: the &struct scsi_host to iterate over
405 *
406 * Iterator that returns each device attached to @shost. It does _not_
407 * take a reference on the scsi_device, so the whole loop must be
408 * protected by shost->host_lock.
409 *
410 * Note: The only reason to use this is because you need to access the
411 * device list in interrupt context. Otherwise you really want to use
412 * shost_for_each_device instead.
413 */
414#define __shost_for_each_device(sdev, shost) \
415 list_for_each_entry((sdev), &((shost)->__devices), siblings)
416
417extern int scsi_change_queue_depth(struct scsi_device *, int);
418extern int scsi_track_queue_full(struct scsi_device *, int);
419
420extern int scsi_set_medium_removal(struct scsi_device *, char);
421
422extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
423 unsigned char *buffer, int len, int timeout,
424 int retries, struct scsi_mode_data *data,
425 struct scsi_sense_hdr *);
426extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
427 unsigned char *buffer, int len, int timeout,
428 int retries, struct scsi_mode_data *data,
429 struct scsi_sense_hdr *);
430extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
431 int retries, struct scsi_sense_hdr *sshdr);
432extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
433 int buf_len);
434extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
435 unsigned int len, unsigned char opcode);
436extern int scsi_device_set_state(struct scsi_device *sdev,
437 enum scsi_device_state state);
438extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
439 gfp_t gfpflags);
440extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
441extern void sdev_evt_send_simple(struct scsi_device *sdev,
442 enum scsi_device_event evt_type, gfp_t gfpflags);
443extern int scsi_device_quiesce(struct scsi_device *sdev);
444extern void scsi_device_resume(struct scsi_device *sdev);
445extern void scsi_target_quiesce(struct scsi_target *);
446extern void scsi_target_resume(struct scsi_target *);
447extern void scsi_scan_target(struct device *parent, unsigned int channel,
448 unsigned int id, u64 lun,
449 enum scsi_scan_mode rescan);
450extern void scsi_target_reap(struct scsi_target *);
451extern void scsi_target_block(struct device *);
452extern void scsi_target_unblock(struct device *, enum scsi_device_state);
453extern void scsi_remove_target(struct device *);
454extern const char *scsi_device_state_name(enum scsi_device_state);
455extern int scsi_is_sdev_device(const struct device *);
456extern int scsi_is_target_device(const struct device *);
457extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
458extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
459 int data_direction, void *buffer, unsigned bufflen,
460 unsigned char *sense, struct scsi_sense_hdr *sshdr,
461 int timeout, int retries, blk_opf_t flags,
462 req_flags_t rq_flags, int *resid);
463/* Make sure any sense buffer is the correct size. */
464#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
465 sshdr, timeout, retries, flags, rq_flags, resid) \
466({ \
467 BUILD_BUG_ON((sense) != NULL && \
468 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \
469 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \
470 sense, sshdr, timeout, retries, flags, rq_flags, \
471 resid); \
472})
473static inline int scsi_execute_req(struct scsi_device *sdev,
474 const unsigned char *cmd, int data_direction, void *buffer,
475 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
476 int retries, int *resid)
477{
478 return scsi_execute(sdev, cmd, data_direction, buffer,
479 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid);
480}
481extern void sdev_disable_disk_events(struct scsi_device *sdev);
482extern void sdev_enable_disk_events(struct scsi_device *sdev);
483extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
484extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
485
486#ifdef CONFIG_PM
487extern int scsi_autopm_get_device(struct scsi_device *);
488extern void scsi_autopm_put_device(struct scsi_device *);
489#else
490static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
491static inline void scsi_autopm_put_device(struct scsi_device *d) {}
492#endif /* CONFIG_PM */
493
494static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
495{
496 return device_reprobe(&sdev->sdev_gendev);
497}
498
499static inline unsigned int sdev_channel(struct scsi_device *sdev)
500{
501 return sdev->channel;
502}
503
504static inline unsigned int sdev_id(struct scsi_device *sdev)
505{
506 return sdev->id;
507}
508
509#define scmd_id(scmd) sdev_id((scmd)->device)
510#define scmd_channel(scmd) sdev_channel((scmd)->device)
511
512/*
513 * checks for positions of the SCSI state machine
514 */
515static inline int scsi_device_online(struct scsi_device *sdev)
516{
517 return (sdev->sdev_state != SDEV_OFFLINE &&
518 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
519 sdev->sdev_state != SDEV_DEL);
520}
521static inline int scsi_device_blocked(struct scsi_device *sdev)
522{
523 return sdev->sdev_state == SDEV_BLOCK ||
524 sdev->sdev_state == SDEV_CREATED_BLOCK;
525}
526static inline int scsi_device_created(struct scsi_device *sdev)
527{
528 return sdev->sdev_state == SDEV_CREATED ||
529 sdev->sdev_state == SDEV_CREATED_BLOCK;
530}
531
532int scsi_internal_device_block_nowait(struct scsi_device *sdev);
533int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
534 enum scsi_device_state new_state);
535
536/* accessor functions for the SCSI parameters */
537static inline int scsi_device_sync(struct scsi_device *sdev)
538{
539 return sdev->sdtr;
540}
541static inline int scsi_device_wide(struct scsi_device *sdev)
542{
543 return sdev->wdtr;
544}
545static inline int scsi_device_dt(struct scsi_device *sdev)
546{
547 return sdev->ppr;
548}
549static inline int scsi_device_dt_only(struct scsi_device *sdev)
550{
551 if (sdev->inquiry_len < 57)
552 return 0;
553 return (sdev->inquiry[56] & 0x0c) == 0x04;
554}
555static inline int scsi_device_ius(struct scsi_device *sdev)
556{
557 if (sdev->inquiry_len < 57)
558 return 0;
559 return sdev->inquiry[56] & 0x01;
560}
561static inline int scsi_device_qas(struct scsi_device *sdev)
562{
563 if (sdev->inquiry_len < 57)
564 return 0;
565 return sdev->inquiry[56] & 0x02;
566}
567static inline int scsi_device_enclosure(struct scsi_device *sdev)
568{
569 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
570}
571
572static inline int scsi_device_protection(struct scsi_device *sdev)
573{
574 if (sdev->no_dif)
575 return 0;
576
577 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
578}
579
580static inline int scsi_device_tpgs(struct scsi_device *sdev)
581{
582 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
583}
584
585/**
586 * scsi_device_supports_vpd - test if a device supports VPD pages
587 * @sdev: the &struct scsi_device to test
588 *
589 * If the 'try_vpd_pages' flag is set it takes precedence.
590 * Otherwise we will assume VPD pages are supported if the
591 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
592 */
593static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
594{
595 /* Attempt VPD inquiry if the device blacklist explicitly calls
596 * for it.
597 */
598 if (sdev->try_vpd_pages)
599 return 1;
600 /*
601 * Although VPD inquiries can go to SCSI-2 type devices,
602 * some USB ones crash on receiving them, and the pages
603 * we currently ask for are mandatory for SPC-2 and beyond
604 */
605 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
606 return 1;
607 return 0;
608}
609
610static inline int scsi_device_busy(struct scsi_device *sdev)
611{
612 return sbitmap_weight(&sdev->budget_map);
613}
614
615#define MODULE_ALIAS_SCSI_DEVICE(type) \
616 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
617#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
618
619#endif /* _SCSI_SCSI_DEVICE_H */
1#ifndef _SCSI_SCSI_DEVICE_H
2#define _SCSI_SCSI_DEVICE_H
3
4#include <linux/list.h>
5#include <linux/spinlock.h>
6#include <linux/workqueue.h>
7#include <linux/blkdev.h>
8#include <scsi/scsi.h>
9#include <linux/atomic.h>
10
11struct device;
12struct request_queue;
13struct scsi_cmnd;
14struct scsi_lun;
15struct scsi_sense_hdr;
16
17struct scsi_mode_data {
18 __u32 length;
19 __u16 block_descriptor_length;
20 __u8 medium_type;
21 __u8 device_specific;
22 __u8 header_length;
23 __u8 longlba:1;
24};
25
26/*
27 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
28 * (for the ascii descriptions) and the state model enforcer:
29 * scsi_lib:scsi_device_set_state().
30 */
31enum scsi_device_state {
32 SDEV_CREATED = 1, /* device created but not added to sysfs
33 * Only internal commands allowed (for inq) */
34 SDEV_RUNNING, /* device properly configured
35 * All commands allowed */
36 SDEV_CANCEL, /* beginning to delete device
37 * Only error handler commands allowed */
38 SDEV_DEL, /* device deleted
39 * no commands allowed */
40 SDEV_QUIESCE, /* Device quiescent. No block commands
41 * will be accepted, only specials (which
42 * originate in the mid-layer) */
43 SDEV_OFFLINE, /* Device offlined (by error handling or
44 * user request */
45 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
46 SDEV_BLOCK, /* Device blocked by scsi lld. No
47 * scsi commands from user or midlayer
48 * should be issued to the scsi
49 * lld. */
50 SDEV_CREATED_BLOCK, /* same as above but for created devices */
51};
52
53enum scsi_device_event {
54 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
55 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
56 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
57 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
58 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
59 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
60 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
61
62 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
63 SDEV_EVT_LAST = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,
64
65 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
66};
67
68struct scsi_event {
69 enum scsi_device_event evt_type;
70 struct list_head node;
71
72 /* put union of data structures, for non-simple event types,
73 * here
74 */
75};
76
77struct scsi_device {
78 struct Scsi_Host *host;
79 struct request_queue *request_queue;
80
81 /* the next two are protected by the host->host_lock */
82 struct list_head siblings; /* list of all devices on this host */
83 struct list_head same_target_siblings; /* just the devices sharing same target id */
84
85 atomic_t device_busy; /* commands actually active on LLDD */
86 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
87
88 spinlock_t list_lock;
89 struct list_head cmd_list; /* queue of in use SCSI Command structures */
90 struct list_head starved_entry;
91 struct scsi_cmnd *current_cmnd; /* currently active command */
92 unsigned short queue_depth; /* How deep of a queue we want */
93 unsigned short max_queue_depth; /* max queue depth */
94 unsigned short last_queue_full_depth; /* These two are used by */
95 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
96 unsigned long last_queue_full_time; /* last queue full time */
97 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
98#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
99
100 unsigned long last_queue_ramp_up; /* last queue ramp up time */
101
102 unsigned int id, channel;
103 u64 lun;
104 unsigned int manufacturer; /* Manufacturer of device, for using
105 * vendor-specific cmd's */
106 unsigned sector_size; /* size in bytes */
107
108 void *hostdata; /* available to low-level driver */
109 char type;
110 char scsi_level;
111 char inq_periph_qual; /* PQ from INQUIRY data */
112 struct mutex inquiry_mutex;
113 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
114 unsigned char * inquiry; /* INQUIRY response data */
115 const char * vendor; /* [back_compat] point into 'inquiry' ... */
116 const char * model; /* ... after scan; point to static string */
117 const char * rev; /* ... "nullnullnullnull" before scan */
118
119#define SCSI_VPD_PG_LEN 255
120 int vpd_pg83_len;
121 unsigned char __rcu *vpd_pg83;
122 int vpd_pg80_len;
123 unsigned char __rcu *vpd_pg80;
124 unsigned char current_tag; /* current tag */
125 struct scsi_target *sdev_target; /* used only for single_lun */
126
127 unsigned int sdev_bflags; /* black/white flags as also found in
128 * scsi_devinfo.[hc]. For now used only to
129 * pass settings from slave_alloc to scsi
130 * core. */
131 unsigned int eh_timeout; /* Error handling timeout */
132 unsigned removable:1;
133 unsigned changed:1; /* Data invalid due to media change */
134 unsigned busy:1; /* Used to prevent races */
135 unsigned lockable:1; /* Able to prevent media removal */
136 unsigned locked:1; /* Media removal disabled */
137 unsigned borken:1; /* Tell the Seagate driver to be
138 * painfully slow on this device */
139 unsigned disconnect:1; /* can disconnect */
140 unsigned soft_reset:1; /* Uses soft reset option */
141 unsigned sdtr:1; /* Device supports SDTR messages */
142 unsigned wdtr:1; /* Device supports WDTR messages */
143 unsigned ppr:1; /* Device supports PPR messages */
144 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
145 unsigned simple_tags:1; /* simple queue tag messages are enabled */
146 unsigned was_reset:1; /* There was a bus reset on the bus for
147 * this device */
148 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
149 * because we did a bus reset. */
150 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
151 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
152 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
153 unsigned no_write_same:1; /* no WRITE SAME command */
154 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
155 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
156 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
157 unsigned skip_vpd_pages:1; /* do not read VPD pages */
158 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
159 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
160 unsigned no_start_on_add:1; /* do not issue start on add */
161 unsigned allow_restart:1; /* issue START_UNIT in error handler */
162 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
163 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
164 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
165 unsigned select_no_atn:1;
166 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
167 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
168 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
169 unsigned last_sector_bug:1; /* do not use multisector accesses on
170 SD_LAST_BUGGY_SECTORS */
171 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
172 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
173 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
174 unsigned is_visible:1; /* is the device visible in sysfs */
175 unsigned wce_default_on:1; /* Cache is ON by default */
176 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
177 unsigned broken_fua:1; /* Don't set FUA bit */
178 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
179 unsigned synchronous_alua:1; /* Synchronous ALUA commands */
180
181 atomic_t disk_events_disable_depth; /* disable depth for disk events */
182
183 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
184 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
185 struct list_head event_list; /* asserted events */
186 struct work_struct event_work;
187
188 unsigned int max_device_blocked; /* what device_blocked counts down from */
189#define SCSI_DEFAULT_DEVICE_BLOCKED 3
190
191 atomic_t iorequest_cnt;
192 atomic_t iodone_cnt;
193 atomic_t ioerr_cnt;
194
195 struct device sdev_gendev,
196 sdev_dev;
197
198 struct execute_work ew; /* used to get process context on put */
199 struct work_struct requeue_work;
200
201 struct scsi_device_handler *handler;
202 void *handler_data;
203
204 unsigned char access_state;
205 enum scsi_device_state sdev_state;
206 unsigned long sdev_data[0];
207} __attribute__((aligned(sizeof(unsigned long))));
208
209#define to_scsi_device(d) \
210 container_of(d, struct scsi_device, sdev_gendev)
211#define class_to_sdev(d) \
212 container_of(d, struct scsi_device, sdev_dev)
213#define transport_class_to_sdev(class_dev) \
214 to_scsi_device(class_dev->parent)
215
216#define sdev_dbg(sdev, fmt, a...) \
217 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
218
219/*
220 * like scmd_printk, but the device name is passed in
221 * as a string pointer
222 */
223__printf(4, 5) void
224sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
225 const char *, ...);
226
227#define sdev_printk(l, sdev, fmt, a...) \
228 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
229
230__printf(3, 4) void
231scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
232
233#define scmd_dbg(scmd, fmt, a...) \
234 do { \
235 if ((scmd)->request->rq_disk) \
236 sdev_dbg((scmd)->device, "[%s] " fmt, \
237 (scmd)->request->rq_disk->disk_name, ##a);\
238 else \
239 sdev_dbg((scmd)->device, fmt, ##a); \
240 } while (0)
241
242enum scsi_target_state {
243 STARGET_CREATED = 1,
244 STARGET_RUNNING,
245 STARGET_DEL,
246};
247
248/*
249 * scsi_target: representation of a scsi target, for now, this is only
250 * used for single_lun devices. If no one has active IO to the target,
251 * starget_sdev_user is NULL, else it points to the active sdev.
252 */
253struct scsi_target {
254 struct scsi_device *starget_sdev_user;
255 struct list_head siblings;
256 struct list_head devices;
257 struct device dev;
258 struct kref reap_ref; /* last put renders target invisible */
259 unsigned int channel;
260 unsigned int id; /* target id ... replace
261 * scsi_device.id eventually */
262 unsigned int create:1; /* signal that it needs to be added */
263 unsigned int single_lun:1; /* Indicates we should only
264 * allow I/O to one of the luns
265 * for the device at a time. */
266 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
267 * means no lun present. */
268 unsigned int no_report_luns:1; /* Don't use
269 * REPORT LUNS for scanning. */
270 unsigned int expecting_lun_change:1; /* A device has reported
271 * a 3F/0E UA, other devices on
272 * the same target will also. */
273 /* commands actually active on LLD. */
274 atomic_t target_busy;
275 atomic_t target_blocked;
276
277 /*
278 * LLDs should set this in the slave_alloc host template callout.
279 * If set to zero then there is not limit.
280 */
281 unsigned int can_queue;
282 unsigned int max_target_blocked;
283#define SCSI_DEFAULT_TARGET_BLOCKED 3
284
285 char scsi_level;
286 enum scsi_target_state state;
287 void *hostdata; /* available to low-level driver */
288 unsigned long starget_data[0]; /* for the transport */
289 /* starget_data must be the last element!!!! */
290} __attribute__((aligned(sizeof(unsigned long))));
291
292#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
293static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
294{
295 return to_scsi_target(sdev->sdev_gendev.parent);
296}
297#define transport_class_to_starget(class_dev) \
298 to_scsi_target(class_dev->parent)
299
300#define starget_printk(prefix, starget, fmt, a...) \
301 dev_printk(prefix, &(starget)->dev, fmt, ##a)
302
303extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
304 uint, uint, u64, void *hostdata);
305extern int scsi_add_device(struct Scsi_Host *host, uint channel,
306 uint target, u64 lun);
307extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
308extern void scsi_remove_device(struct scsi_device *);
309extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
310void scsi_attach_vpd(struct scsi_device *sdev);
311
312extern int scsi_device_get(struct scsi_device *);
313extern void scsi_device_put(struct scsi_device *);
314extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
315 uint, uint, u64);
316extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
317 uint, uint, u64);
318extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
319 u64);
320extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
321 u64);
322extern void starget_for_each_device(struct scsi_target *, void *,
323 void (*fn)(struct scsi_device *, void *));
324extern void __starget_for_each_device(struct scsi_target *, void *,
325 void (*fn)(struct scsi_device *,
326 void *));
327
328/* only exposed to implement shost_for_each_device */
329extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
330 struct scsi_device *);
331
332/**
333 * shost_for_each_device - iterate over all devices of a host
334 * @sdev: the &struct scsi_device to use as a cursor
335 * @shost: the &struct scsi_host to iterate over
336 *
337 * Iterator that returns each device attached to @shost. This loop
338 * takes a reference on each device and releases it at the end. If
339 * you break out of the loop, you must call scsi_device_put(sdev).
340 */
341#define shost_for_each_device(sdev, shost) \
342 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
343 (sdev); \
344 (sdev) = __scsi_iterate_devices((shost), (sdev)))
345
346/**
347 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
348 * @sdev: the &struct scsi_device to use as a cursor
349 * @shost: the &struct scsi_host to iterate over
350 *
351 * Iterator that returns each device attached to @shost. It does _not_
352 * take a reference on the scsi_device, so the whole loop must be
353 * protected by shost->host_lock.
354 *
355 * Note: The only reason to use this is because you need to access the
356 * device list in interrupt context. Otherwise you really want to use
357 * shost_for_each_device instead.
358 */
359#define __shost_for_each_device(sdev, shost) \
360 list_for_each_entry((sdev), &((shost)->__devices), siblings)
361
362extern int scsi_change_queue_depth(struct scsi_device *, int);
363extern int scsi_track_queue_full(struct scsi_device *, int);
364
365extern int scsi_set_medium_removal(struct scsi_device *, char);
366
367extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
368 unsigned char *buffer, int len, int timeout,
369 int retries, struct scsi_mode_data *data,
370 struct scsi_sense_hdr *);
371extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
372 int modepage, unsigned char *buffer, int len,
373 int timeout, int retries,
374 struct scsi_mode_data *data,
375 struct scsi_sense_hdr *);
376extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
377 int retries, struct scsi_sense_hdr *sshdr);
378extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
379 int buf_len);
380extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
381 unsigned int len, unsigned char opcode);
382extern int scsi_device_set_state(struct scsi_device *sdev,
383 enum scsi_device_state state);
384extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
385 gfp_t gfpflags);
386extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
387extern void sdev_evt_send_simple(struct scsi_device *sdev,
388 enum scsi_device_event evt_type, gfp_t gfpflags);
389extern int scsi_device_quiesce(struct scsi_device *sdev);
390extern void scsi_device_resume(struct scsi_device *sdev);
391extern void scsi_target_quiesce(struct scsi_target *);
392extern void scsi_target_resume(struct scsi_target *);
393extern void scsi_scan_target(struct device *parent, unsigned int channel,
394 unsigned int id, u64 lun, int rescan);
395extern void scsi_target_reap(struct scsi_target *);
396extern void scsi_target_block(struct device *);
397extern void scsi_target_unblock(struct device *, enum scsi_device_state);
398extern void scsi_remove_target(struct device *);
399extern const char *scsi_device_state_name(enum scsi_device_state);
400extern int scsi_is_sdev_device(const struct device *);
401extern int scsi_is_target_device(const struct device *);
402extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
403extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
404 int data_direction, void *buffer, unsigned bufflen,
405 unsigned char *sense, int timeout, int retries,
406 u64 flags, int *resid);
407extern int scsi_execute_req_flags(struct scsi_device *sdev,
408 const unsigned char *cmd, int data_direction, void *buffer,
409 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
410 int retries, int *resid, u64 flags);
411static inline int scsi_execute_req(struct scsi_device *sdev,
412 const unsigned char *cmd, int data_direction, void *buffer,
413 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
414 int retries, int *resid)
415{
416 return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
417 bufflen, sshdr, timeout, retries, resid, 0);
418}
419extern void sdev_disable_disk_events(struct scsi_device *sdev);
420extern void sdev_enable_disk_events(struct scsi_device *sdev);
421extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
422extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
423
424#ifdef CONFIG_PM
425extern int scsi_autopm_get_device(struct scsi_device *);
426extern void scsi_autopm_put_device(struct scsi_device *);
427#else
428static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
429static inline void scsi_autopm_put_device(struct scsi_device *d) {}
430#endif /* CONFIG_PM */
431
432static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
433{
434 return device_reprobe(&sdev->sdev_gendev);
435}
436
437static inline unsigned int sdev_channel(struct scsi_device *sdev)
438{
439 return sdev->channel;
440}
441
442static inline unsigned int sdev_id(struct scsi_device *sdev)
443{
444 return sdev->id;
445}
446
447#define scmd_id(scmd) sdev_id((scmd)->device)
448#define scmd_channel(scmd) sdev_channel((scmd)->device)
449
450/*
451 * checks for positions of the SCSI state machine
452 */
453static inline int scsi_device_online(struct scsi_device *sdev)
454{
455 return (sdev->sdev_state != SDEV_OFFLINE &&
456 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
457 sdev->sdev_state != SDEV_DEL);
458}
459static inline int scsi_device_blocked(struct scsi_device *sdev)
460{
461 return sdev->sdev_state == SDEV_BLOCK ||
462 sdev->sdev_state == SDEV_CREATED_BLOCK;
463}
464static inline int scsi_device_created(struct scsi_device *sdev)
465{
466 return sdev->sdev_state == SDEV_CREATED ||
467 sdev->sdev_state == SDEV_CREATED_BLOCK;
468}
469
470/* accessor functions for the SCSI parameters */
471static inline int scsi_device_sync(struct scsi_device *sdev)
472{
473 return sdev->sdtr;
474}
475static inline int scsi_device_wide(struct scsi_device *sdev)
476{
477 return sdev->wdtr;
478}
479static inline int scsi_device_dt(struct scsi_device *sdev)
480{
481 return sdev->ppr;
482}
483static inline int scsi_device_dt_only(struct scsi_device *sdev)
484{
485 if (sdev->inquiry_len < 57)
486 return 0;
487 return (sdev->inquiry[56] & 0x0c) == 0x04;
488}
489static inline int scsi_device_ius(struct scsi_device *sdev)
490{
491 if (sdev->inquiry_len < 57)
492 return 0;
493 return sdev->inquiry[56] & 0x01;
494}
495static inline int scsi_device_qas(struct scsi_device *sdev)
496{
497 if (sdev->inquiry_len < 57)
498 return 0;
499 return sdev->inquiry[56] & 0x02;
500}
501static inline int scsi_device_enclosure(struct scsi_device *sdev)
502{
503 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
504}
505
506static inline int scsi_device_protection(struct scsi_device *sdev)
507{
508 if (sdev->no_dif)
509 return 0;
510
511 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
512}
513
514static inline int scsi_device_tpgs(struct scsi_device *sdev)
515{
516 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
517}
518
519/**
520 * scsi_device_supports_vpd - test if a device supports VPD pages
521 * @sdev: the &struct scsi_device to test
522 *
523 * If the 'try_vpd_pages' flag is set it takes precedence.
524 * Otherwise we will assume VPD pages are supported if the
525 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
526 */
527static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
528{
529 /* Attempt VPD inquiry if the device blacklist explicitly calls
530 * for it.
531 */
532 if (sdev->try_vpd_pages)
533 return 1;
534 /*
535 * Although VPD inquiries can go to SCSI-2 type devices,
536 * some USB ones crash on receiving them, and the pages
537 * we currently ask for are for SPC-3 and beyond
538 */
539 if (sdev->scsi_level > SCSI_SPC_2 && !sdev->skip_vpd_pages)
540 return 1;
541 return 0;
542}
543
544#define MODULE_ALIAS_SCSI_DEVICE(type) \
545 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
546#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
547
548#endif /* _SCSI_SCSI_DEVICE_H */