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