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
13 struct bsg_device;
14 struct device;
15 struct request_queue;
16 struct scsi_cmnd;
17 struct scsi_lun;
18 struct scsi_sense_hdr;
19
20 typedef __u64 __bitwise blist_flags_t;
21
22 #define SCSI_SENSE_BUFFERSIZE 96
23
24 struct 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 */
38 enum 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
60 enum scsi_scan_mode {
61 SCSI_SCAN_INITIAL = 0,
62 SCSI_SCAN_RESCAN,
63 SCSI_SCAN_MANUAL,
64 };
65
66 enum 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
82 struct 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 */
97 struct scsi_vpd {
98 struct rcu_head rcu;
99 int len;
100 unsigned char data[];
101 };
102
103 enum scsi_vpd_parameters {
104 SCSI_VPD_HEADER_SIZE = 4,
105 };
106
107 struct 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 skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
188 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
189 unsigned skip_vpd_pages:1; /* do not read VPD pages */
190 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
191 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
192 unsigned no_start_on_add:1; /* do not issue start on add */
193 unsigned allow_restart:1; /* issue START_UNIT in error handler */
194 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
195 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
196 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
197 unsigned select_no_atn:1;
198 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
199 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
200 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
201 unsigned last_sector_bug:1; /* do not use multisector accesses on
202 SD_LAST_BUGGY_SECTORS */
203 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
204 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
205 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
206 unsigned security_supported:1; /* Supports Security Protocols */
207 unsigned is_visible:1; /* is the device visible in sysfs */
208 unsigned wce_default_on:1; /* Cache is ON by default */
209 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
210 unsigned broken_fua:1; /* Don't set FUA bit */
211 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
212 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
213 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
214 * creation time */
215 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
216 unsigned silence_suspend:1; /* Do not print runtime PM related messages */
217
218 unsigned int queue_stopped; /* request queue is quiesced */
219 bool offline_already; /* Device offline message logged */
220
221 atomic_t disk_events_disable_depth; /* disable depth for disk events */
222
223 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
224 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
225 struct list_head event_list; /* asserted events */
226 struct work_struct event_work;
227
228 unsigned int max_device_blocked; /* what device_blocked counts down from */
229 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
230
231 atomic_t iorequest_cnt;
232 atomic_t iodone_cnt;
233 atomic_t ioerr_cnt;
234
235 struct device sdev_gendev,
236 sdev_dev;
237
238 struct execute_work ew; /* used to get process context on put */
239 struct work_struct requeue_work;
240
241 struct scsi_device_handler *handler;
242 void *handler_data;
243
244 size_t dma_drain_len;
245 void *dma_drain_buf;
246
247 unsigned int sg_timeout;
248 unsigned int sg_reserved_size;
249
250 struct bsg_device *bsg_dev;
251 unsigned char access_state;
252 struct mutex state_mutex;
253 enum scsi_device_state sdev_state;
254 struct task_struct *quiesced_by;
255 unsigned long sdev_data[];
256 } __attribute__((aligned(sizeof(unsigned long))));
257
258 #define to_scsi_device(d) \
259 container_of(d, struct scsi_device, sdev_gendev)
260 #define class_to_sdev(d) \
261 container_of(d, struct scsi_device, sdev_dev)
262 #define transport_class_to_sdev(class_dev) \
263 to_scsi_device(class_dev->parent)
264
265 #define sdev_dbg(sdev, fmt, a...) \
266 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
267
268 /*
269 * like scmd_printk, but the device name is passed in
270 * as a string pointer
271 */
272 __printf(4, 5) void
273 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
274 const char *, ...);
275
276 #define sdev_printk(l, sdev, fmt, a...) \
277 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
278
279 __printf(3, 4) void
280 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
281
282 #define scmd_dbg(scmd, fmt, a...) \
283 do { \
284 struct request *__rq = scsi_cmd_to_rq((scmd)); \
285 \
286 if (__rq->q->disk) \
287 sdev_dbg((scmd)->device, "[%s] " fmt, \
288 __rq->q->disk->disk_name, ##a); \
289 else \
290 sdev_dbg((scmd)->device, fmt, ##a); \
291 } while (0)
292
293 enum scsi_target_state {
294 STARGET_CREATED = 1,
295 STARGET_RUNNING,
296 STARGET_REMOVE,
297 STARGET_CREATED_REMOVE,
298 STARGET_DEL,
299 };
300
301 /*
302 * scsi_target: representation of a scsi target, for now, this is only
303 * used for single_lun devices. If no one has active IO to the target,
304 * starget_sdev_user is NULL, else it points to the active sdev.
305 */
306 struct scsi_target {
307 struct scsi_device *starget_sdev_user;
308 struct list_head siblings;
309 struct list_head devices;
310 struct device dev;
311 struct kref reap_ref; /* last put renders target invisible */
312 unsigned int channel;
313 unsigned int id; /* target id ... replace
314 * scsi_device.id eventually */
315 unsigned int create:1; /* signal that it needs to be added */
316 unsigned int single_lun:1; /* Indicates we should only
317 * allow I/O to one of the luns
318 * for the device at a time. */
319 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
320 * means no lun present. */
321 unsigned int no_report_luns:1; /* Don't use
322 * REPORT LUNS for scanning. */
323 unsigned int expecting_lun_change:1; /* A device has reported
324 * a 3F/0E UA, other devices on
325 * the same target will also. */
326 /* commands actually active on LLD. */
327 atomic_t target_busy;
328 atomic_t target_blocked;
329
330 /*
331 * LLDs should set this in the slave_alloc host template callout.
332 * If set to zero then there is not limit.
333 */
334 unsigned int can_queue;
335 unsigned int max_target_blocked;
336 #define SCSI_DEFAULT_TARGET_BLOCKED 3
337
338 char scsi_level;
339 enum scsi_target_state state;
340 void *hostdata; /* available to low-level driver */
341 unsigned long starget_data[]; /* for the transport */
342 /* starget_data must be the last element!!!! */
343 } __attribute__((aligned(sizeof(unsigned long))));
344
345 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
scsi_target(struct scsi_device * sdev)346 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
347 {
348 return to_scsi_target(sdev->sdev_gendev.parent);
349 }
350 #define transport_class_to_starget(class_dev) \
351 to_scsi_target(class_dev->parent)
352
353 #define starget_printk(prefix, starget, fmt, a...) \
354 dev_printk(prefix, &(starget)->dev, fmt, ##a)
355
356 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
357 uint, uint, u64, void *hostdata);
358 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
359 uint target, u64 lun);
360 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
361 extern void scsi_remove_device(struct scsi_device *);
362 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
363 void scsi_attach_vpd(struct scsi_device *sdev);
364
365 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
366 extern int __must_check scsi_device_get(struct scsi_device *);
367 extern void scsi_device_put(struct scsi_device *);
368 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
369 uint, uint, u64);
370 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
371 uint, uint, u64);
372 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
373 u64);
374 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
375 u64);
376 extern void starget_for_each_device(struct scsi_target *, void *,
377 void (*fn)(struct scsi_device *, void *));
378 extern void __starget_for_each_device(struct scsi_target *, void *,
379 void (*fn)(struct scsi_device *,
380 void *));
381
382 /* only exposed to implement shost_for_each_device */
383 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
384 struct scsi_device *);
385
386 /**
387 * shost_for_each_device - iterate over all devices of a host
388 * @sdev: the &struct scsi_device to use as a cursor
389 * @shost: the &struct scsi_host to iterate over
390 *
391 * Iterator that returns each device attached to @shost. This loop
392 * takes a reference on each device and releases it at the end. If
393 * you break out of the loop, you must call scsi_device_put(sdev).
394 */
395 #define shost_for_each_device(sdev, shost) \
396 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
397 (sdev); \
398 (sdev) = __scsi_iterate_devices((shost), (sdev)))
399
400 /**
401 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
402 * @sdev: the &struct scsi_device to use as a cursor
403 * @shost: the &struct scsi_host to iterate over
404 *
405 * Iterator that returns each device attached to @shost. It does _not_
406 * take a reference on the scsi_device, so the whole loop must be
407 * protected by shost->host_lock.
408 *
409 * Note: The only reason to use this is because you need to access the
410 * device list in interrupt context. Otherwise you really want to use
411 * shost_for_each_device instead.
412 */
413 #define __shost_for_each_device(sdev, shost) \
414 list_for_each_entry((sdev), &((shost)->__devices), siblings)
415
416 extern int scsi_change_queue_depth(struct scsi_device *, int);
417 extern int scsi_track_queue_full(struct scsi_device *, int);
418
419 extern int scsi_set_medium_removal(struct scsi_device *, char);
420
421 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
422 unsigned char *buffer, int len, int timeout,
423 int retries, struct scsi_mode_data *data,
424 struct scsi_sense_hdr *);
425 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
426 unsigned char *buffer, int len, int timeout,
427 int retries, struct scsi_mode_data *data,
428 struct scsi_sense_hdr *);
429 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
430 int retries, struct scsi_sense_hdr *sshdr);
431 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
432 int buf_len);
433 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
434 unsigned int len, unsigned char opcode);
435 extern int scsi_device_set_state(struct scsi_device *sdev,
436 enum scsi_device_state state);
437 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
438 gfp_t gfpflags);
439 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
440 extern void sdev_evt_send_simple(struct scsi_device *sdev,
441 enum scsi_device_event evt_type, gfp_t gfpflags);
442 extern int scsi_device_quiesce(struct scsi_device *sdev);
443 extern void scsi_device_resume(struct scsi_device *sdev);
444 extern void scsi_target_quiesce(struct scsi_target *);
445 extern void scsi_target_resume(struct scsi_target *);
446 extern void scsi_scan_target(struct device *parent, unsigned int channel,
447 unsigned int id, u64 lun,
448 enum scsi_scan_mode rescan);
449 extern void scsi_target_reap(struct scsi_target *);
450 extern void scsi_target_block(struct device *);
451 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
452 extern void scsi_remove_target(struct device *);
453 extern const char *scsi_device_state_name(enum scsi_device_state);
454 extern int scsi_is_sdev_device(const struct device *);
455 extern int scsi_is_target_device(const struct device *);
456 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
457 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
458 int data_direction, void *buffer, unsigned bufflen,
459 unsigned char *sense, struct scsi_sense_hdr *sshdr,
460 int timeout, int retries, u64 flags,
461 req_flags_t rq_flags, int *resid);
462 /* Make sure any sense buffer is the correct size. */
463 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
464 sshdr, timeout, retries, flags, rq_flags, resid) \
465 ({ \
466 BUILD_BUG_ON((sense) != NULL && \
467 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \
468 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \
469 sense, sshdr, timeout, retries, flags, rq_flags, \
470 resid); \
471 })
scsi_execute_req(struct scsi_device * sdev,const unsigned char * cmd,int data_direction,void * buffer,unsigned bufflen,struct scsi_sense_hdr * sshdr,int timeout,int retries,int * resid)472 static inline int scsi_execute_req(struct scsi_device *sdev,
473 const unsigned char *cmd, int data_direction, void *buffer,
474 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
475 int retries, int *resid)
476 {
477 return scsi_execute(sdev, cmd, data_direction, buffer,
478 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid);
479 }
480 extern void sdev_disable_disk_events(struct scsi_device *sdev);
481 extern void sdev_enable_disk_events(struct scsi_device *sdev);
482 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
483 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
484
485 #ifdef CONFIG_PM
486 extern int scsi_autopm_get_device(struct scsi_device *);
487 extern void scsi_autopm_put_device(struct scsi_device *);
488 #else
scsi_autopm_get_device(struct scsi_device * d)489 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
scsi_autopm_put_device(struct scsi_device * d)490 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
491 #endif /* CONFIG_PM */
492
scsi_device_reprobe(struct scsi_device * sdev)493 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
494 {
495 return device_reprobe(&sdev->sdev_gendev);
496 }
497
sdev_channel(struct scsi_device * sdev)498 static inline unsigned int sdev_channel(struct scsi_device *sdev)
499 {
500 return sdev->channel;
501 }
502
sdev_id(struct scsi_device * sdev)503 static inline unsigned int sdev_id(struct scsi_device *sdev)
504 {
505 return sdev->id;
506 }
507
508 #define scmd_id(scmd) sdev_id((scmd)->device)
509 #define scmd_channel(scmd) sdev_channel((scmd)->device)
510
511 /*
512 * checks for positions of the SCSI state machine
513 */
scsi_device_online(struct scsi_device * sdev)514 static inline int scsi_device_online(struct scsi_device *sdev)
515 {
516 return (sdev->sdev_state != SDEV_OFFLINE &&
517 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
518 sdev->sdev_state != SDEV_DEL);
519 }
scsi_device_blocked(struct scsi_device * sdev)520 static inline int scsi_device_blocked(struct scsi_device *sdev)
521 {
522 return sdev->sdev_state == SDEV_BLOCK ||
523 sdev->sdev_state == SDEV_CREATED_BLOCK;
524 }
scsi_device_created(struct scsi_device * sdev)525 static inline int scsi_device_created(struct scsi_device *sdev)
526 {
527 return sdev->sdev_state == SDEV_CREATED ||
528 sdev->sdev_state == SDEV_CREATED_BLOCK;
529 }
530
531 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
532 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
533 enum scsi_device_state new_state);
534
535 /* accessor functions for the SCSI parameters */
scsi_device_sync(struct scsi_device * sdev)536 static inline int scsi_device_sync(struct scsi_device *sdev)
537 {
538 return sdev->sdtr;
539 }
scsi_device_wide(struct scsi_device * sdev)540 static inline int scsi_device_wide(struct scsi_device *sdev)
541 {
542 return sdev->wdtr;
543 }
scsi_device_dt(struct scsi_device * sdev)544 static inline int scsi_device_dt(struct scsi_device *sdev)
545 {
546 return sdev->ppr;
547 }
scsi_device_dt_only(struct scsi_device * sdev)548 static inline int scsi_device_dt_only(struct scsi_device *sdev)
549 {
550 if (sdev->inquiry_len < 57)
551 return 0;
552 return (sdev->inquiry[56] & 0x0c) == 0x04;
553 }
scsi_device_ius(struct scsi_device * sdev)554 static inline int scsi_device_ius(struct scsi_device *sdev)
555 {
556 if (sdev->inquiry_len < 57)
557 return 0;
558 return sdev->inquiry[56] & 0x01;
559 }
scsi_device_qas(struct scsi_device * sdev)560 static inline int scsi_device_qas(struct scsi_device *sdev)
561 {
562 if (sdev->inquiry_len < 57)
563 return 0;
564 return sdev->inquiry[56] & 0x02;
565 }
scsi_device_enclosure(struct scsi_device * sdev)566 static inline int scsi_device_enclosure(struct scsi_device *sdev)
567 {
568 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
569 }
570
scsi_device_protection(struct scsi_device * sdev)571 static inline int scsi_device_protection(struct scsi_device *sdev)
572 {
573 if (sdev->no_dif)
574 return 0;
575
576 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
577 }
578
scsi_device_tpgs(struct scsi_device * sdev)579 static inline int scsi_device_tpgs(struct scsi_device *sdev)
580 {
581 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
582 }
583
584 /**
585 * scsi_device_supports_vpd - test if a device supports VPD pages
586 * @sdev: the &struct scsi_device to test
587 *
588 * If the 'try_vpd_pages' flag is set it takes precedence.
589 * Otherwise we will assume VPD pages are supported if the
590 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
591 */
scsi_device_supports_vpd(struct scsi_device * sdev)592 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
593 {
594 /* Attempt VPD inquiry if the device blacklist explicitly calls
595 * for it.
596 */
597 if (sdev->try_vpd_pages)
598 return 1;
599 /*
600 * Although VPD inquiries can go to SCSI-2 type devices,
601 * some USB ones crash on receiving them, and the pages
602 * we currently ask for are mandatory for SPC-2 and beyond
603 */
604 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
605 return 1;
606 return 0;
607 }
608
scsi_device_busy(struct scsi_device * sdev)609 static inline int scsi_device_busy(struct scsi_device *sdev)
610 {
611 return sbitmap_weight(&sdev->budget_map);
612 }
613
614 #define MODULE_ALIAS_SCSI_DEVICE(type) \
615 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
616 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
617
618 #endif /* _SCSI_SCSI_DEVICE_H */
619