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 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
274 sdev_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
281 scmd_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
294 enum 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 */
307 struct 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)
scsi_target(struct scsi_device * sdev)347 static 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
357 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
358 uint, uint, u64, void *hostdata);
359 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
360 uint target, u64 lun);
361 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
362 extern void scsi_remove_device(struct scsi_device *);
363 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
364 void scsi_attach_vpd(struct scsi_device *sdev);
365
366 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
367 extern int __must_check scsi_device_get(struct scsi_device *);
368 extern void scsi_device_put(struct scsi_device *);
369 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
370 uint, uint, u64);
371 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
372 uint, uint, u64);
373 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
374 u64);
375 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
376 u64);
377 extern void starget_for_each_device(struct scsi_target *, void *,
378 void (*fn)(struct scsi_device *, void *));
379 extern 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 */
384 extern 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
417 extern int scsi_change_queue_depth(struct scsi_device *, int);
418 extern int scsi_track_queue_full(struct scsi_device *, int);
419
420 extern int scsi_set_medium_removal(struct scsi_device *, char);
421
422 extern 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 *);
426 extern 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 *);
430 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
431 int retries, struct scsi_sense_hdr *sshdr);
432 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
433 int buf_len);
434 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
435 unsigned int len, unsigned char opcode);
436 extern int scsi_device_set_state(struct scsi_device *sdev,
437 enum scsi_device_state state);
438 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
439 gfp_t gfpflags);
440 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
441 extern void sdev_evt_send_simple(struct scsi_device *sdev,
442 enum scsi_device_event evt_type, gfp_t gfpflags);
443 extern int scsi_device_quiesce(struct scsi_device *sdev);
444 extern void scsi_device_resume(struct scsi_device *sdev);
445 extern void scsi_target_quiesce(struct scsi_target *);
446 extern void scsi_target_resume(struct scsi_target *);
447 extern void scsi_scan_target(struct device *parent, unsigned int channel,
448 unsigned int id, u64 lun,
449 enum scsi_scan_mode rescan);
450 extern void scsi_target_reap(struct scsi_target *);
451 extern void scsi_target_block(struct device *);
452 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
453 extern void scsi_remove_target(struct device *);
454 extern const char *scsi_device_state_name(enum scsi_device_state);
455 extern int scsi_is_sdev_device(const struct device *);
456 extern int scsi_is_target_device(const struct device *);
457 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
458
459 /* Optional arguments to scsi_execute_cmd */
460 struct scsi_exec_args {
461 unsigned char *sense; /* sense buffer */
462 unsigned int sense_len; /* sense buffer len */
463 struct scsi_sense_hdr *sshdr; /* decoded sense header */
464 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */
465 int scmd_flags; /* SCMD flags */
466 int *resid; /* residual length */
467 };
468
469 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
470 blk_opf_t opf, void *buffer, unsigned int bufflen,
471 int timeout, int retries,
472 const struct scsi_exec_args *args);
473
474 extern void sdev_disable_disk_events(struct scsi_device *sdev);
475 extern void sdev_enable_disk_events(struct scsi_device *sdev);
476 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
477 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
478
479 #ifdef CONFIG_PM
480 extern int scsi_autopm_get_device(struct scsi_device *);
481 extern void scsi_autopm_put_device(struct scsi_device *);
482 #else
scsi_autopm_get_device(struct scsi_device * d)483 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
scsi_autopm_put_device(struct scsi_device * d)484 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
485 #endif /* CONFIG_PM */
486
scsi_device_reprobe(struct scsi_device * sdev)487 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
488 {
489 return device_reprobe(&sdev->sdev_gendev);
490 }
491
sdev_channel(struct scsi_device * sdev)492 static inline unsigned int sdev_channel(struct scsi_device *sdev)
493 {
494 return sdev->channel;
495 }
496
sdev_id(struct scsi_device * sdev)497 static inline unsigned int sdev_id(struct scsi_device *sdev)
498 {
499 return sdev->id;
500 }
501
502 #define scmd_id(scmd) sdev_id((scmd)->device)
503 #define scmd_channel(scmd) sdev_channel((scmd)->device)
504
505 /*
506 * checks for positions of the SCSI state machine
507 */
scsi_device_online(struct scsi_device * sdev)508 static inline int scsi_device_online(struct scsi_device *sdev)
509 {
510 return (sdev->sdev_state != SDEV_OFFLINE &&
511 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
512 sdev->sdev_state != SDEV_DEL);
513 }
scsi_device_blocked(struct scsi_device * sdev)514 static inline int scsi_device_blocked(struct scsi_device *sdev)
515 {
516 return sdev->sdev_state == SDEV_BLOCK ||
517 sdev->sdev_state == SDEV_CREATED_BLOCK;
518 }
scsi_device_created(struct scsi_device * sdev)519 static inline int scsi_device_created(struct scsi_device *sdev)
520 {
521 return sdev->sdev_state == SDEV_CREATED ||
522 sdev->sdev_state == SDEV_CREATED_BLOCK;
523 }
524
525 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
526 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
527 enum scsi_device_state new_state);
528
529 /* accessor functions for the SCSI parameters */
scsi_device_sync(struct scsi_device * sdev)530 static inline int scsi_device_sync(struct scsi_device *sdev)
531 {
532 return sdev->sdtr;
533 }
scsi_device_wide(struct scsi_device * sdev)534 static inline int scsi_device_wide(struct scsi_device *sdev)
535 {
536 return sdev->wdtr;
537 }
scsi_device_dt(struct scsi_device * sdev)538 static inline int scsi_device_dt(struct scsi_device *sdev)
539 {
540 return sdev->ppr;
541 }
scsi_device_dt_only(struct scsi_device * sdev)542 static inline int scsi_device_dt_only(struct scsi_device *sdev)
543 {
544 if (sdev->inquiry_len < 57)
545 return 0;
546 return (sdev->inquiry[56] & 0x0c) == 0x04;
547 }
scsi_device_ius(struct scsi_device * sdev)548 static inline int scsi_device_ius(struct scsi_device *sdev)
549 {
550 if (sdev->inquiry_len < 57)
551 return 0;
552 return sdev->inquiry[56] & 0x01;
553 }
scsi_device_qas(struct scsi_device * sdev)554 static inline int scsi_device_qas(struct scsi_device *sdev)
555 {
556 if (sdev->inquiry_len < 57)
557 return 0;
558 return sdev->inquiry[56] & 0x02;
559 }
scsi_device_enclosure(struct scsi_device * sdev)560 static inline int scsi_device_enclosure(struct scsi_device *sdev)
561 {
562 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
563 }
564
scsi_device_protection(struct scsi_device * sdev)565 static inline int scsi_device_protection(struct scsi_device *sdev)
566 {
567 if (sdev->no_dif)
568 return 0;
569
570 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
571 }
572
scsi_device_tpgs(struct scsi_device * sdev)573 static inline int scsi_device_tpgs(struct scsi_device *sdev)
574 {
575 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
576 }
577
578 /**
579 * scsi_device_supports_vpd - test if a device supports VPD pages
580 * @sdev: the &struct scsi_device to test
581 *
582 * If the 'try_vpd_pages' flag is set it takes precedence.
583 * Otherwise we will assume VPD pages are supported if the
584 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
585 */
scsi_device_supports_vpd(struct scsi_device * sdev)586 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
587 {
588 /* Attempt VPD inquiry if the device blacklist explicitly calls
589 * for it.
590 */
591 if (sdev->try_vpd_pages)
592 return 1;
593 /*
594 * Although VPD inquiries can go to SCSI-2 type devices,
595 * some USB ones crash on receiving them, and the pages
596 * we currently ask for are mandatory for SPC-2 and beyond
597 */
598 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
599 return 1;
600 return 0;
601 }
602
scsi_device_busy(struct scsi_device * sdev)603 static inline int scsi_device_busy(struct scsi_device *sdev)
604 {
605 return sbitmap_weight(&sdev->budget_map);
606 }
607
608 #define MODULE_ALIAS_SCSI_DEVICE(type) \
609 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
610 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
611
612 #endif /* _SCSI_SCSI_DEVICE_H */
613