1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SCSI_SCSI_DEVICE_H
3 #define _SCSI_SCSI_DEVICE_H
4
5 #include <linux/list.h>
6 #include <linux/spinlock.h>
7 #include <linux/workqueue.h>
8 #include <linux/blkdev.h>
9 #include <scsi/scsi.h>
10 #include <linux/atomic.h>
11
12 struct device;
13 struct request_queue;
14 struct scsi_cmnd;
15 struct scsi_lun;
16 struct scsi_sense_hdr;
17
18 typedef __u64 __bitwise blist_flags_t;
19
20 #define SCSI_SENSE_BUFFERSIZE 96
21
22 struct scsi_mode_data {
23 __u32 length;
24 __u16 block_descriptor_length;
25 __u8 medium_type;
26 __u8 device_specific;
27 __u8 header_length;
28 __u8 longlba:1;
29 };
30
31 /*
32 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
33 * (for the ascii descriptions) and the state model enforcer:
34 * scsi_lib:scsi_device_set_state().
35 */
36 enum scsi_device_state {
37 SDEV_CREATED = 1, /* device created but not added to sysfs
38 * Only internal commands allowed (for inq) */
39 SDEV_RUNNING, /* device properly configured
40 * All commands allowed */
41 SDEV_CANCEL, /* beginning to delete device
42 * Only error handler commands allowed */
43 SDEV_DEL, /* device deleted
44 * no commands allowed */
45 SDEV_QUIESCE, /* Device quiescent. No block commands
46 * will be accepted, only specials (which
47 * originate in the mid-layer) */
48 SDEV_OFFLINE, /* Device offlined (by error handling or
49 * user request */
50 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
51 SDEV_BLOCK, /* Device blocked by scsi lld. No
52 * scsi commands from user or midlayer
53 * should be issued to the scsi
54 * lld. */
55 SDEV_CREATED_BLOCK, /* same as above but for created devices */
56 };
57
58 enum scsi_scan_mode {
59 SCSI_SCAN_INITIAL = 0,
60 SCSI_SCAN_RESCAN,
61 SCSI_SCAN_MANUAL,
62 };
63
64 enum scsi_device_event {
65 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
66 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
67 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
68 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
69 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
70 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
71 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
72 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */
73
74 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
75 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED,
76
77 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
78 };
79
80 struct scsi_event {
81 enum scsi_device_event evt_type;
82 struct list_head node;
83
84 /* put union of data structures, for non-simple event types,
85 * here
86 */
87 };
88
89 /**
90 * struct scsi_vpd - SCSI Vital Product Data
91 * @rcu: For kfree_rcu().
92 * @len: Length in bytes of @data.
93 * @data: VPD data as defined in various T10 SCSI standard documents.
94 */
95 struct scsi_vpd {
96 struct rcu_head rcu;
97 int len;
98 unsigned char data[];
99 };
100
101 struct scsi_device {
102 struct Scsi_Host *host;
103 struct request_queue *request_queue;
104
105 /* the next two are protected by the host->host_lock */
106 struct list_head siblings; /* list of all devices on this host */
107 struct list_head same_target_siblings; /* just the devices sharing same target id */
108
109 atomic_t device_busy; /* commands actually active on LLDD */
110 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
111
112 atomic_t restarts;
113 spinlock_t list_lock;
114 struct list_head starved_entry;
115 unsigned short queue_depth; /* How deep of a queue we want */
116 unsigned short max_queue_depth; /* max queue depth */
117 unsigned short last_queue_full_depth; /* These two are used by */
118 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
119 unsigned long last_queue_full_time; /* last queue full time */
120 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
121 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
122
123 unsigned long last_queue_ramp_up; /* last queue ramp up time */
124
125 unsigned int id, channel;
126 u64 lun;
127 unsigned int manufacturer; /* Manufacturer of device, for using
128 * vendor-specific cmd's */
129 unsigned sector_size; /* size in bytes */
130
131 void *hostdata; /* available to low-level driver */
132 unsigned char type;
133 char scsi_level;
134 char inq_periph_qual; /* PQ from INQUIRY data */
135 struct mutex inquiry_mutex;
136 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
137 unsigned char * inquiry; /* INQUIRY response data */
138 const char * vendor; /* [back_compat] point into 'inquiry' ... */
139 const char * model; /* ... after scan; point to static string */
140 const char * rev; /* ... "nullnullnullnull" before scan */
141
142 #define SCSI_VPD_PG_LEN 255
143 struct scsi_vpd __rcu *vpd_pg0;
144 struct scsi_vpd __rcu *vpd_pg83;
145 struct scsi_vpd __rcu *vpd_pg80;
146 struct scsi_vpd __rcu *vpd_pg89;
147 unsigned char current_tag; /* current tag */
148 struct scsi_target *sdev_target; /* used only for single_lun */
149
150 blist_flags_t sdev_bflags; /* black/white flags as also found in
151 * scsi_devinfo.[hc]. For now used only to
152 * pass settings from slave_alloc to scsi
153 * core. */
154 unsigned int eh_timeout; /* Error handling timeout */
155 unsigned removable:1;
156 unsigned changed:1; /* Data invalid due to media change */
157 unsigned busy:1; /* Used to prevent races */
158 unsigned lockable:1; /* Able to prevent media removal */
159 unsigned locked:1; /* Media removal disabled */
160 unsigned borken:1; /* Tell the Seagate driver to be
161 * painfully slow on this device */
162 unsigned disconnect:1; /* can disconnect */
163 unsigned soft_reset:1; /* Uses soft reset option */
164 unsigned sdtr:1; /* Device supports SDTR messages */
165 unsigned wdtr:1; /* Device supports WDTR messages */
166 unsigned ppr:1; /* Device supports PPR messages */
167 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
168 unsigned simple_tags:1; /* simple queue tag messages are enabled */
169 unsigned was_reset:1; /* There was a bus reset on the bus for
170 * this device */
171 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
172 * because we did a bus reset. */
173 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
174 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
175 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
176 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
177 unsigned no_write_same:1; /* no WRITE SAME command */
178 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
179 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
180 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
181 unsigned skip_vpd_pages:1; /* do not read VPD pages */
182 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
183 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
184 unsigned no_start_on_add:1; /* do not issue start on add */
185 unsigned allow_restart:1; /* issue START_UNIT in error handler */
186 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
187 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
188 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
189 unsigned select_no_atn:1;
190 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
191 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
192 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
193 unsigned last_sector_bug:1; /* do not use multisector accesses on
194 SD_LAST_BUGGY_SECTORS */
195 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
196 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
197 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
198 unsigned security_supported:1; /* Supports Security Protocols */
199 unsigned is_visible:1; /* is the device visible in sysfs */
200 unsigned wce_default_on:1; /* Cache is ON by default */
201 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
202 unsigned broken_fua:1; /* Don't set FUA bit */
203 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
204 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
205 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
206 * creation time */
207 unsigned queue_stopped:1; /* request queue is quiesced */
208
209 bool offline_already; /* Device offline message logged */
210
211 atomic_t disk_events_disable_depth; /* disable depth for disk events */
212
213 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
214 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
215 struct list_head event_list; /* asserted events */
216 struct work_struct event_work;
217
218 unsigned int max_device_blocked; /* what device_blocked counts down from */
219 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
220
221 atomic_t iorequest_cnt;
222 atomic_t iodone_cnt;
223 atomic_t ioerr_cnt;
224
225 struct device sdev_gendev,
226 sdev_dev;
227
228 struct execute_work ew; /* used to get process context on put */
229 struct work_struct requeue_work;
230
231 struct scsi_device_handler *handler;
232 void *handler_data;
233
234 size_t dma_drain_len;
235 void *dma_drain_buf;
236
237 unsigned char access_state;
238 struct mutex state_mutex;
239 enum scsi_device_state sdev_state;
240 struct task_struct *quiesced_by;
241 unsigned long sdev_data[];
242 } __attribute__((aligned(sizeof(unsigned long))));
243
244 #define to_scsi_device(d) \
245 container_of(d, struct scsi_device, sdev_gendev)
246 #define class_to_sdev(d) \
247 container_of(d, struct scsi_device, sdev_dev)
248 #define transport_class_to_sdev(class_dev) \
249 to_scsi_device(class_dev->parent)
250
251 #define sdev_dbg(sdev, fmt, a...) \
252 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
253
254 /*
255 * like scmd_printk, but the device name is passed in
256 * as a string pointer
257 */
258 __printf(4, 5) void
259 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
260 const char *, ...);
261
262 #define sdev_printk(l, sdev, fmt, a...) \
263 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
264
265 __printf(3, 4) void
266 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
267
268 #define scmd_dbg(scmd, fmt, a...) \
269 do { \
270 if ((scmd)->request->rq_disk) \
271 sdev_dbg((scmd)->device, "[%s] " fmt, \
272 (scmd)->request->rq_disk->disk_name, ##a);\
273 else \
274 sdev_dbg((scmd)->device, fmt, ##a); \
275 } while (0)
276
277 enum scsi_target_state {
278 STARGET_CREATED = 1,
279 STARGET_RUNNING,
280 STARGET_REMOVE,
281 STARGET_CREATED_REMOVE,
282 STARGET_DEL,
283 };
284
285 /*
286 * scsi_target: representation of a scsi target, for now, this is only
287 * used for single_lun devices. If no one has active IO to the target,
288 * starget_sdev_user is NULL, else it points to the active sdev.
289 */
290 struct scsi_target {
291 struct scsi_device *starget_sdev_user;
292 struct list_head siblings;
293 struct list_head devices;
294 struct device dev;
295 struct kref reap_ref; /* last put renders target invisible */
296 unsigned int channel;
297 unsigned int id; /* target id ... replace
298 * scsi_device.id eventually */
299 unsigned int create:1; /* signal that it needs to be added */
300 unsigned int single_lun:1; /* Indicates we should only
301 * allow I/O to one of the luns
302 * for the device at a time. */
303 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
304 * means no lun present. */
305 unsigned int no_report_luns:1; /* Don't use
306 * REPORT LUNS for scanning. */
307 unsigned int expecting_lun_change:1; /* A device has reported
308 * a 3F/0E UA, other devices on
309 * the same target will also. */
310 /* commands actually active on LLD. */
311 atomic_t target_busy;
312 atomic_t target_blocked;
313
314 /*
315 * LLDs should set this in the slave_alloc host template callout.
316 * If set to zero then there is not limit.
317 */
318 unsigned int can_queue;
319 unsigned int max_target_blocked;
320 #define SCSI_DEFAULT_TARGET_BLOCKED 3
321
322 char scsi_level;
323 enum scsi_target_state state;
324 void *hostdata; /* available to low-level driver */
325 unsigned long starget_data[]; /* for the transport */
326 /* starget_data must be the last element!!!! */
327 } __attribute__((aligned(sizeof(unsigned long))));
328
329 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
scsi_target(struct scsi_device * sdev)330 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
331 {
332 return to_scsi_target(sdev->sdev_gendev.parent);
333 }
334 #define transport_class_to_starget(class_dev) \
335 to_scsi_target(class_dev->parent)
336
337 #define starget_printk(prefix, starget, fmt, a...) \
338 dev_printk(prefix, &(starget)->dev, fmt, ##a)
339
340 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
341 uint, uint, u64, void *hostdata);
342 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
343 uint target, u64 lun);
344 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
345 extern void scsi_remove_device(struct scsi_device *);
346 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
347 void scsi_attach_vpd(struct scsi_device *sdev);
348
349 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
350 extern int __must_check scsi_device_get(struct scsi_device *);
351 extern void scsi_device_put(struct scsi_device *);
352 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
353 uint, uint, u64);
354 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
355 uint, uint, u64);
356 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
357 u64);
358 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
359 u64);
360 extern void starget_for_each_device(struct scsi_target *, void *,
361 void (*fn)(struct scsi_device *, void *));
362 extern void __starget_for_each_device(struct scsi_target *, void *,
363 void (*fn)(struct scsi_device *,
364 void *));
365
366 /* only exposed to implement shost_for_each_device */
367 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
368 struct scsi_device *);
369
370 /**
371 * shost_for_each_device - iterate over all devices of a host
372 * @sdev: the &struct scsi_device to use as a cursor
373 * @shost: the &struct scsi_host to iterate over
374 *
375 * Iterator that returns each device attached to @shost. This loop
376 * takes a reference on each device and releases it at the end. If
377 * you break out of the loop, you must call scsi_device_put(sdev).
378 */
379 #define shost_for_each_device(sdev, shost) \
380 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
381 (sdev); \
382 (sdev) = __scsi_iterate_devices((shost), (sdev)))
383
384 /**
385 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
386 * @sdev: the &struct scsi_device to use as a cursor
387 * @shost: the &struct scsi_host to iterate over
388 *
389 * Iterator that returns each device attached to @shost. It does _not_
390 * take a reference on the scsi_device, so the whole loop must be
391 * protected by shost->host_lock.
392 *
393 * Note: The only reason to use this is because you need to access the
394 * device list in interrupt context. Otherwise you really want to use
395 * shost_for_each_device instead.
396 */
397 #define __shost_for_each_device(sdev, shost) \
398 list_for_each_entry((sdev), &((shost)->__devices), siblings)
399
400 extern int scsi_change_queue_depth(struct scsi_device *, int);
401 extern int scsi_track_queue_full(struct scsi_device *, int);
402
403 extern int scsi_set_medium_removal(struct scsi_device *, char);
404
405 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
406 unsigned char *buffer, int len, int timeout,
407 int retries, struct scsi_mode_data *data,
408 struct scsi_sense_hdr *);
409 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
410 int modepage, unsigned char *buffer, int len,
411 int timeout, int retries,
412 struct scsi_mode_data *data,
413 struct scsi_sense_hdr *);
414 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
415 int retries, struct scsi_sense_hdr *sshdr);
416 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
417 int buf_len);
418 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
419 unsigned int len, unsigned char opcode);
420 extern int scsi_device_set_state(struct scsi_device *sdev,
421 enum scsi_device_state state);
422 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
423 gfp_t gfpflags);
424 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
425 extern void sdev_evt_send_simple(struct scsi_device *sdev,
426 enum scsi_device_event evt_type, gfp_t gfpflags);
427 extern int scsi_device_quiesce(struct scsi_device *sdev);
428 extern void scsi_device_resume(struct scsi_device *sdev);
429 extern void scsi_target_quiesce(struct scsi_target *);
430 extern void scsi_target_resume(struct scsi_target *);
431 extern void scsi_scan_target(struct device *parent, unsigned int channel,
432 unsigned int id, u64 lun,
433 enum scsi_scan_mode rescan);
434 extern void scsi_target_reap(struct scsi_target *);
435 extern void scsi_target_block(struct device *);
436 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
437 extern void scsi_remove_target(struct device *);
438 extern const char *scsi_device_state_name(enum scsi_device_state);
439 extern int scsi_is_sdev_device(const struct device *);
440 extern int scsi_is_target_device(const struct device *);
441 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
442 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
443 int data_direction, void *buffer, unsigned bufflen,
444 unsigned char *sense, struct scsi_sense_hdr *sshdr,
445 int timeout, int retries, u64 flags,
446 req_flags_t rq_flags, int *resid);
447 /* Make sure any sense buffer is the correct size. */
448 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
449 sshdr, timeout, retries, flags, rq_flags, resid) \
450 ({ \
451 BUILD_BUG_ON((sense) != NULL && \
452 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \
453 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \
454 sense, sshdr, timeout, retries, flags, rq_flags, \
455 resid); \
456 })
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)457 static inline int scsi_execute_req(struct scsi_device *sdev,
458 const unsigned char *cmd, int data_direction, void *buffer,
459 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
460 int retries, int *resid)
461 {
462 return scsi_execute(sdev, cmd, data_direction, buffer,
463 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid);
464 }
465 extern void sdev_disable_disk_events(struct scsi_device *sdev);
466 extern void sdev_enable_disk_events(struct scsi_device *sdev);
467 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
468 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
469
470 #ifdef CONFIG_PM
471 extern int scsi_autopm_get_device(struct scsi_device *);
472 extern void scsi_autopm_put_device(struct scsi_device *);
473 #else
scsi_autopm_get_device(struct scsi_device * d)474 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
scsi_autopm_put_device(struct scsi_device * d)475 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
476 #endif /* CONFIG_PM */
477
scsi_device_reprobe(struct scsi_device * sdev)478 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
479 {
480 return device_reprobe(&sdev->sdev_gendev);
481 }
482
sdev_channel(struct scsi_device * sdev)483 static inline unsigned int sdev_channel(struct scsi_device *sdev)
484 {
485 return sdev->channel;
486 }
487
sdev_id(struct scsi_device * sdev)488 static inline unsigned int sdev_id(struct scsi_device *sdev)
489 {
490 return sdev->id;
491 }
492
493 #define scmd_id(scmd) sdev_id((scmd)->device)
494 #define scmd_channel(scmd) sdev_channel((scmd)->device)
495
496 /*
497 * checks for positions of the SCSI state machine
498 */
scsi_device_online(struct scsi_device * sdev)499 static inline int scsi_device_online(struct scsi_device *sdev)
500 {
501 return (sdev->sdev_state != SDEV_OFFLINE &&
502 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
503 sdev->sdev_state != SDEV_DEL);
504 }
scsi_device_blocked(struct scsi_device * sdev)505 static inline int scsi_device_blocked(struct scsi_device *sdev)
506 {
507 return sdev->sdev_state == SDEV_BLOCK ||
508 sdev->sdev_state == SDEV_CREATED_BLOCK;
509 }
scsi_device_created(struct scsi_device * sdev)510 static inline int scsi_device_created(struct scsi_device *sdev)
511 {
512 return sdev->sdev_state == SDEV_CREATED ||
513 sdev->sdev_state == SDEV_CREATED_BLOCK;
514 }
515
516 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
517 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
518 enum scsi_device_state new_state);
519
520 /* accessor functions for the SCSI parameters */
scsi_device_sync(struct scsi_device * sdev)521 static inline int scsi_device_sync(struct scsi_device *sdev)
522 {
523 return sdev->sdtr;
524 }
scsi_device_wide(struct scsi_device * sdev)525 static inline int scsi_device_wide(struct scsi_device *sdev)
526 {
527 return sdev->wdtr;
528 }
scsi_device_dt(struct scsi_device * sdev)529 static inline int scsi_device_dt(struct scsi_device *sdev)
530 {
531 return sdev->ppr;
532 }
scsi_device_dt_only(struct scsi_device * sdev)533 static inline int scsi_device_dt_only(struct scsi_device *sdev)
534 {
535 if (sdev->inquiry_len < 57)
536 return 0;
537 return (sdev->inquiry[56] & 0x0c) == 0x04;
538 }
scsi_device_ius(struct scsi_device * sdev)539 static inline int scsi_device_ius(struct scsi_device *sdev)
540 {
541 if (sdev->inquiry_len < 57)
542 return 0;
543 return sdev->inquiry[56] & 0x01;
544 }
scsi_device_qas(struct scsi_device * sdev)545 static inline int scsi_device_qas(struct scsi_device *sdev)
546 {
547 if (sdev->inquiry_len < 57)
548 return 0;
549 return sdev->inquiry[56] & 0x02;
550 }
scsi_device_enclosure(struct scsi_device * sdev)551 static inline int scsi_device_enclosure(struct scsi_device *sdev)
552 {
553 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
554 }
555
scsi_device_protection(struct scsi_device * sdev)556 static inline int scsi_device_protection(struct scsi_device *sdev)
557 {
558 if (sdev->no_dif)
559 return 0;
560
561 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
562 }
563
scsi_device_tpgs(struct scsi_device * sdev)564 static inline int scsi_device_tpgs(struct scsi_device *sdev)
565 {
566 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
567 }
568
569 /**
570 * scsi_device_supports_vpd - test if a device supports VPD pages
571 * @sdev: the &struct scsi_device to test
572 *
573 * If the 'try_vpd_pages' flag is set it takes precedence.
574 * Otherwise we will assume VPD pages are supported if the
575 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
576 */
scsi_device_supports_vpd(struct scsi_device * sdev)577 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
578 {
579 /* Attempt VPD inquiry if the device blacklist explicitly calls
580 * for it.
581 */
582 if (sdev->try_vpd_pages)
583 return 1;
584 /*
585 * Although VPD inquiries can go to SCSI-2 type devices,
586 * some USB ones crash on receiving them, and the pages
587 * we currently ask for are mandatory for SPC-2 and beyond
588 */
589 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
590 return 1;
591 return 0;
592 }
593
594 #define MODULE_ALIAS_SCSI_DEVICE(type) \
595 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
596 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
597
598 #endif /* _SCSI_SCSI_DEVICE_H */
599