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
103struct scsi_device {
104 struct Scsi_Host *host;
105 struct request_queue *request_queue;
106
107 /* the next two are protected by the host->host_lock */
108 struct list_head siblings; /* list of all devices on this host */
109 struct list_head same_target_siblings; /* just the devices sharing same target id */
110
111 struct sbitmap budget_map;
112 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
113
114 atomic_t restarts;
115 spinlock_t list_lock;
116 struct list_head starved_entry;
117 unsigned short queue_depth; /* How deep of a queue we want */
118 unsigned short max_queue_depth; /* max queue depth */
119 unsigned short last_queue_full_depth; /* These two are used by */
120 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
121 unsigned long last_queue_full_time; /* last queue full time */
122 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
123#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
124
125 unsigned long last_queue_ramp_up; /* last queue ramp up time */
126
127 unsigned int id, channel;
128 u64 lun;
129 unsigned int manufacturer; /* Manufacturer of device, for using
130 * vendor-specific cmd's */
131 unsigned sector_size; /* size in bytes */
132
133 void *hostdata; /* available to low-level driver */
134 unsigned char type;
135 char scsi_level;
136 char inq_periph_qual; /* PQ from INQUIRY data */
137 struct mutex inquiry_mutex;
138 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
139 unsigned char * inquiry; /* INQUIRY response data */
140 const char * vendor; /* [back_compat] point into 'inquiry' ... */
141 const char * model; /* ... after scan; point to static string */
142 const char * rev; /* ... "nullnullnullnull" before scan */
143
144#define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */
145 struct scsi_vpd __rcu *vpd_pg0;
146 struct scsi_vpd __rcu *vpd_pg83;
147 struct scsi_vpd __rcu *vpd_pg80;
148 struct scsi_vpd __rcu *vpd_pg89;
149 struct scsi_vpd __rcu *vpd_pgb0;
150 struct scsi_vpd __rcu *vpd_pgb1;
151 struct scsi_vpd __rcu *vpd_pgb2;
152 struct scsi_vpd __rcu *vpd_pgb7;
153
154 struct scsi_target *sdev_target;
155
156 blist_flags_t sdev_bflags; /* black/white flags as also found in
157 * scsi_devinfo.[hc]. For now used only to
158 * pass settings from slave_alloc to scsi
159 * core. */
160 unsigned int eh_timeout; /* Error handling timeout */
161
162 /*
163 * If true, let the high-level device driver (sd) manage the device
164 * power state for system suspend/resume (suspend to RAM and
165 * hibernation) operations.
166 */
167 unsigned manage_system_start_stop:1;
168
169 /*
170 * If true, let the high-level device driver (sd) manage the device
171 * power state for runtime device suspand and resume operations.
172 */
173 unsigned manage_runtime_start_stop:1;
174
175 /*
176 * If true, let the high-level device driver (sd) manage the device
177 * power state for system shutdown (power off) operations.
178 */
179 unsigned manage_shutdown:1;
180
181 /*
182 * If set and if the device is runtime suspended, ask the high-level
183 * device driver (sd) to force a runtime resume of the device.
184 */
185 unsigned force_runtime_start_on_system_start:1;
186
187 unsigned removable:1;
188 unsigned changed:1; /* Data invalid due to media change */
189 unsigned busy:1; /* Used to prevent races */
190 unsigned lockable:1; /* Able to prevent media removal */
191 unsigned locked:1; /* Media removal disabled */
192 unsigned borken:1; /* Tell the Seagate driver to be
193 * painfully slow on this device */
194 unsigned disconnect:1; /* can disconnect */
195 unsigned soft_reset:1; /* Uses soft reset option */
196 unsigned sdtr:1; /* Device supports SDTR messages */
197 unsigned wdtr:1; /* Device supports WDTR messages */
198 unsigned ppr:1; /* Device supports PPR messages */
199 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
200 unsigned simple_tags:1; /* simple queue tag messages are enabled */
201 unsigned was_reset:1; /* There was a bus reset on the bus for
202 * this device */
203 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
204 * because we did a bus reset. */
205 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
206 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
207 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
208 unsigned read_before_ms:1; /* perform a READ before MODE SENSE */
209 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
210 unsigned no_write_same:1; /* no WRITE SAME command */
211 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
212 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */
213 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
214 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
215 unsigned skip_vpd_pages:1; /* do not read VPD pages */
216 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
217 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
218 unsigned no_start_on_add:1; /* do not issue start on add */
219 unsigned allow_restart:1; /* issue START_UNIT in error handler */
220 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
221 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
222 unsigned select_no_atn:1;
223 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
224 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
225 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
226 unsigned last_sector_bug:1; /* do not use multisector accesses on
227 SD_LAST_BUGGY_SECTORS */
228 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
229 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
230 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
231 unsigned security_supported:1; /* Supports Security Protocols */
232 unsigned is_visible:1; /* is the device visible in sysfs */
233 unsigned wce_default_on:1; /* Cache is ON by default */
234 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
235 unsigned broken_fua:1; /* Don't set FUA bit */
236 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
237 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
238 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
239 * creation time */
240 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
241 unsigned silence_suspend:1; /* Do not print runtime PM related messages */
242 unsigned no_vpd_size:1; /* No VPD size reported in header */
243
244 unsigned cdl_supported:1; /* Command duration limits supported */
245 unsigned cdl_enable:1; /* Enable/disable Command duration limits */
246
247 unsigned int queue_stopped; /* request queue is quiesced */
248 bool offline_already; /* Device offline message logged */
249
250 atomic_t disk_events_disable_depth; /* disable depth for disk events */
251
252 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
253 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
254 struct list_head event_list; /* asserted events */
255 struct work_struct event_work;
256
257 unsigned int max_device_blocked; /* what device_blocked counts down from */
258#define SCSI_DEFAULT_DEVICE_BLOCKED 3
259
260 atomic_t iorequest_cnt;
261 atomic_t iodone_cnt;
262 atomic_t ioerr_cnt;
263 atomic_t iotmo_cnt;
264
265 struct device sdev_gendev,
266 sdev_dev;
267
268 struct work_struct requeue_work;
269
270 struct scsi_device_handler *handler;
271 void *handler_data;
272
273 size_t dma_drain_len;
274 void *dma_drain_buf;
275
276 unsigned int sg_timeout;
277 unsigned int sg_reserved_size;
278
279 struct bsg_device *bsg_dev;
280 unsigned char access_state;
281 struct mutex state_mutex;
282 enum scsi_device_state sdev_state;
283 struct task_struct *quiesced_by;
284 unsigned long sdev_data[];
285} __attribute__((aligned(sizeof(unsigned long))));
286
287#define to_scsi_device(d) \
288 container_of(d, struct scsi_device, sdev_gendev)
289#define class_to_sdev(d) \
290 container_of(d, struct scsi_device, sdev_dev)
291#define transport_class_to_sdev(class_dev) \
292 to_scsi_device(class_dev->parent)
293
294#define sdev_dbg(sdev, fmt, a...) \
295 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
296
297/*
298 * like scmd_printk, but the device name is passed in
299 * as a string pointer
300 */
301__printf(4, 5) void
302sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
303 const char *, ...);
304
305#define sdev_printk(l, sdev, fmt, a...) \
306 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
307
308__printf(3, 4) void
309scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
310
311#define scmd_dbg(scmd, fmt, a...) \
312 do { \
313 struct request *__rq = scsi_cmd_to_rq((scmd)); \
314 \
315 if (__rq->q->disk) \
316 sdev_dbg((scmd)->device, "[%s] " fmt, \
317 __rq->q->disk->disk_name, ##a); \
318 else \
319 sdev_dbg((scmd)->device, fmt, ##a); \
320 } while (0)
321
322enum scsi_target_state {
323 STARGET_CREATED = 1,
324 STARGET_RUNNING,
325 STARGET_REMOVE,
326 STARGET_CREATED_REMOVE,
327 STARGET_DEL,
328};
329
330/*
331 * scsi_target: representation of a scsi target, for now, this is only
332 * used for single_lun devices. If no one has active IO to the target,
333 * starget_sdev_user is NULL, else it points to the active sdev.
334 */
335struct scsi_target {
336 struct scsi_device *starget_sdev_user;
337 struct list_head siblings;
338 struct list_head devices;
339 struct device dev;
340 struct kref reap_ref; /* last put renders target invisible */
341 unsigned int channel;
342 unsigned int id; /* target id ... replace
343 * scsi_device.id eventually */
344 unsigned int create:1; /* signal that it needs to be added */
345 unsigned int single_lun:1; /* Indicates we should only
346 * allow I/O to one of the luns
347 * for the device at a time. */
348 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
349 * means no lun present. */
350 unsigned int no_report_luns:1; /* Don't use
351 * REPORT LUNS for scanning. */
352 unsigned int expecting_lun_change:1; /* A device has reported
353 * a 3F/0E UA, other devices on
354 * the same target will also. */
355 /* commands actually active on LLD. */
356 atomic_t target_busy;
357 atomic_t target_blocked;
358
359 /*
360 * LLDs should set this in the slave_alloc host template callout.
361 * If set to zero then there is not limit.
362 */
363 unsigned int can_queue;
364 unsigned int max_target_blocked;
365#define SCSI_DEFAULT_TARGET_BLOCKED 3
366
367 char scsi_level;
368 enum scsi_target_state state;
369 void *hostdata; /* available to low-level driver */
370 unsigned long starget_data[]; /* for the transport */
371 /* starget_data must be the last element!!!! */
372} __attribute__((aligned(sizeof(unsigned long))));
373
374#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
375static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
376{
377 return to_scsi_target(sdev->sdev_gendev.parent);
378}
379#define transport_class_to_starget(class_dev) \
380 to_scsi_target(class_dev->parent)
381
382#define starget_printk(prefix, starget, fmt, a...) \
383 dev_printk(prefix, &(starget)->dev, fmt, ##a)
384
385extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
386 uint, uint, u64, void *hostdata);
387extern int scsi_add_device(struct Scsi_Host *host, uint channel,
388 uint target, u64 lun);
389extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
390extern void scsi_remove_device(struct scsi_device *);
391extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
392void scsi_attach_vpd(struct scsi_device *sdev);
393void scsi_cdl_check(struct scsi_device *sdev);
394int scsi_cdl_enable(struct scsi_device *sdev, bool enable);
395
396extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
397extern int __must_check scsi_device_get(struct scsi_device *);
398extern void scsi_device_put(struct scsi_device *);
399extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
400 uint, uint, u64);
401extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
402 uint, uint, u64);
403extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
404 u64);
405extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
406 u64);
407extern void starget_for_each_device(struct scsi_target *, void *,
408 void (*fn)(struct scsi_device *, void *));
409extern void __starget_for_each_device(struct scsi_target *, void *,
410 void (*fn)(struct scsi_device *,
411 void *));
412
413/* only exposed to implement shost_for_each_device */
414extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
415 struct scsi_device *);
416
417/**
418 * shost_for_each_device - iterate over all devices of a host
419 * @sdev: the &struct scsi_device to use as a cursor
420 * @shost: the &struct scsi_host to iterate over
421 *
422 * Iterator that returns each device attached to @shost. This loop
423 * takes a reference on each device and releases it at the end. If
424 * you break out of the loop, you must call scsi_device_put(sdev).
425 */
426#define shost_for_each_device(sdev, shost) \
427 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
428 (sdev); \
429 (sdev) = __scsi_iterate_devices((shost), (sdev)))
430
431/**
432 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
433 * @sdev: the &struct scsi_device to use as a cursor
434 * @shost: the &struct scsi_host to iterate over
435 *
436 * Iterator that returns each device attached to @shost. It does _not_
437 * take a reference on the scsi_device, so the whole loop must be
438 * protected by shost->host_lock.
439 *
440 * Note: The only reason to use this is because you need to access the
441 * device list in interrupt context. Otherwise you really want to use
442 * shost_for_each_device instead.
443 */
444#define __shost_for_each_device(sdev, shost) \
445 list_for_each_entry((sdev), &((shost)->__devices), siblings)
446
447extern int scsi_change_queue_depth(struct scsi_device *, int);
448extern int scsi_track_queue_full(struct scsi_device *, int);
449
450extern int scsi_set_medium_removal(struct scsi_device *, char);
451
452int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
453 int subpage, unsigned char *buffer, int len, int timeout,
454 int retries, struct scsi_mode_data *data,
455 struct scsi_sense_hdr *);
456extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
457 unsigned char *buffer, int len, int timeout,
458 int retries, struct scsi_mode_data *data,
459 struct scsi_sense_hdr *);
460extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
461 int retries, struct scsi_sense_hdr *sshdr);
462extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
463 int buf_len);
464int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
465 unsigned int len, unsigned char opcode,
466 unsigned short sa);
467extern int scsi_device_set_state(struct scsi_device *sdev,
468 enum scsi_device_state state);
469extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
470 gfp_t gfpflags);
471extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
472extern void sdev_evt_send_simple(struct scsi_device *sdev,
473 enum scsi_device_event evt_type, gfp_t gfpflags);
474extern int scsi_device_quiesce(struct scsi_device *sdev);
475extern void scsi_device_resume(struct scsi_device *sdev);
476extern void scsi_target_quiesce(struct scsi_target *);
477extern void scsi_target_resume(struct scsi_target *);
478extern void scsi_scan_target(struct device *parent, unsigned int channel,
479 unsigned int id, u64 lun,
480 enum scsi_scan_mode rescan);
481extern void scsi_target_reap(struct scsi_target *);
482void scsi_block_targets(struct Scsi_Host *shost, struct device *dev);
483extern void scsi_target_unblock(struct device *, enum scsi_device_state);
484extern void scsi_remove_target(struct device *);
485extern const char *scsi_device_state_name(enum scsi_device_state);
486extern int scsi_is_sdev_device(const struct device *);
487extern int scsi_is_target_device(const struct device *);
488extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
489
490/*
491 * scsi_execute_cmd users can set scsi_failure.result to have
492 * scsi_check_passthrough fail/retry a command. scsi_failure.result can be a
493 * specific host byte or message code, or SCMD_FAILURE_RESULT_ANY can be used
494 * to match any host or message code.
495 */
496#define SCMD_FAILURE_RESULT_ANY 0x7fffffff
497/*
498 * Set scsi_failure.result to SCMD_FAILURE_STAT_ANY to fail/retry any failure
499 * scsi_status_is_good returns false for.
500 */
501#define SCMD_FAILURE_STAT_ANY 0xff
502/*
503 * The following can be set to the scsi_failure sense, asc and ascq fields to
504 * match on any sense, ASC, or ASCQ value.
505 */
506#define SCMD_FAILURE_SENSE_ANY 0xff
507#define SCMD_FAILURE_ASC_ANY 0xff
508#define SCMD_FAILURE_ASCQ_ANY 0xff
509/* Always retry a matching failure. */
510#define SCMD_FAILURE_NO_LIMIT -1
511
512struct scsi_failure {
513 int result;
514 u8 sense;
515 u8 asc;
516 u8 ascq;
517 /*
518 * Number of times scsi_execute_cmd will retry the failure. It does
519 * not count for the total_allowed.
520 */
521 s8 allowed;
522 /* Number of times the failure has been retried. */
523 s8 retries;
524};
525
526struct scsi_failures {
527 /*
528 * If a scsi_failure does not have a retry limit setup this limit will
529 * be used.
530 */
531 int total_allowed;
532 int total_retries;
533 struct scsi_failure *failure_definitions;
534};
535
536/* Optional arguments to scsi_execute_cmd */
537struct scsi_exec_args {
538 unsigned char *sense; /* sense buffer */
539 unsigned int sense_len; /* sense buffer len */
540 struct scsi_sense_hdr *sshdr; /* decoded sense header */
541 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */
542 int scmd_flags; /* SCMD flags */
543 int *resid; /* residual length */
544 struct scsi_failures *failures; /* failures to retry */
545};
546
547int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
548 blk_opf_t opf, void *buffer, unsigned int bufflen,
549 int timeout, int retries,
550 const struct scsi_exec_args *args);
551void scsi_failures_reset_retries(struct scsi_failures *failures);
552
553extern void sdev_disable_disk_events(struct scsi_device *sdev);
554extern void sdev_enable_disk_events(struct scsi_device *sdev);
555extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
556extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
557
558#ifdef CONFIG_PM
559extern int scsi_autopm_get_device(struct scsi_device *);
560extern void scsi_autopm_put_device(struct scsi_device *);
561#else
562static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
563static inline void scsi_autopm_put_device(struct scsi_device *d) {}
564#endif /* CONFIG_PM */
565
566static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
567{
568 return device_reprobe(dev: &sdev->sdev_gendev);
569}
570
571static inline unsigned int sdev_channel(struct scsi_device *sdev)
572{
573 return sdev->channel;
574}
575
576static inline unsigned int sdev_id(struct scsi_device *sdev)
577{
578 return sdev->id;
579}
580
581#define scmd_id(scmd) sdev_id((scmd)->device)
582#define scmd_channel(scmd) sdev_channel((scmd)->device)
583
584/*
585 * checks for positions of the SCSI state machine
586 */
587static inline int scsi_device_online(struct scsi_device *sdev)
588{
589 return (sdev->sdev_state != SDEV_OFFLINE &&
590 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
591 sdev->sdev_state != SDEV_DEL);
592}
593static inline int scsi_device_blocked(struct scsi_device *sdev)
594{
595 return sdev->sdev_state == SDEV_BLOCK ||
596 sdev->sdev_state == SDEV_CREATED_BLOCK;
597}
598static inline int scsi_device_created(struct scsi_device *sdev)
599{
600 return sdev->sdev_state == SDEV_CREATED ||
601 sdev->sdev_state == SDEV_CREATED_BLOCK;
602}
603
604int scsi_internal_device_block_nowait(struct scsi_device *sdev);
605int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
606 enum scsi_device_state new_state);
607
608/* accessor functions for the SCSI parameters */
609static inline int scsi_device_sync(struct scsi_device *sdev)
610{
611 return sdev->sdtr;
612}
613static inline int scsi_device_wide(struct scsi_device *sdev)
614{
615 return sdev->wdtr;
616}
617static inline int scsi_device_dt(struct scsi_device *sdev)
618{
619 return sdev->ppr;
620}
621static inline int scsi_device_dt_only(struct scsi_device *sdev)
622{
623 if (sdev->inquiry_len < 57)
624 return 0;
625 return (sdev->inquiry[56] & 0x0c) == 0x04;
626}
627static inline int scsi_device_ius(struct scsi_device *sdev)
628{
629 if (sdev->inquiry_len < 57)
630 return 0;
631 return sdev->inquiry[56] & 0x01;
632}
633static inline int scsi_device_qas(struct scsi_device *sdev)
634{
635 if (sdev->inquiry_len < 57)
636 return 0;
637 return sdev->inquiry[56] & 0x02;
638}
639static inline int scsi_device_enclosure(struct scsi_device *sdev)
640{
641 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
642}
643
644static inline int scsi_device_protection(struct scsi_device *sdev)
645{
646 if (sdev->no_dif)
647 return 0;
648
649 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
650}
651
652static inline int scsi_device_tpgs(struct scsi_device *sdev)
653{
654 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
655}
656
657/**
658 * scsi_device_supports_vpd - test if a device supports VPD pages
659 * @sdev: the &struct scsi_device to test
660 *
661 * If the 'try_vpd_pages' flag is set it takes precedence.
662 * Otherwise we will assume VPD pages are supported if the
663 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
664 */
665static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
666{
667 /* Attempt VPD inquiry if the device blacklist explicitly calls
668 * for it.
669 */
670 if (sdev->try_vpd_pages)
671 return 1;
672 /*
673 * Although VPD inquiries can go to SCSI-2 type devices,
674 * some USB ones crash on receiving them, and the pages
675 * we currently ask for are mandatory for SPC-2 and beyond
676 */
677 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
678 return 1;
679 return 0;
680}
681
682static inline int scsi_device_busy(struct scsi_device *sdev)
683{
684 return sbitmap_weight(sb: &sdev->budget_map);
685}
686
687#define MODULE_ALIAS_SCSI_DEVICE(type) \
688 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
689#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
690
691#endif /* _SCSI_SCSI_DEVICE_H */
692

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