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 atomic_t restarts;
114 spinlock_t list_lock;
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_pg0;
145 struct scsi_vpd __rcu *vpd_pg83;
146 struct scsi_vpd __rcu *vpd_pg80;
147 struct scsi_vpd __rcu *vpd_pg89;
148 unsigned char current_tag; /* current tag */
149 struct scsi_target *sdev_target; /* used only for single_lun */
150
151 blist_flags_t sdev_bflags; /* black/white flags as also found in
152 * scsi_devinfo.[hc]. For now used only to
153 * pass settings from slave_alloc to scsi
154 * core. */
155 unsigned int eh_timeout; /* Error handling timeout */
156 unsigned removable:1;
157 unsigned changed:1; /* Data invalid due to media change */
158 unsigned busy:1; /* Used to prevent races */
159 unsigned lockable:1; /* Able to prevent media removal */
160 unsigned locked:1; /* Media removal disabled */
161 unsigned borken:1; /* Tell the Seagate driver to be
162 * painfully slow on this device */
163 unsigned disconnect:1; /* can disconnect */
164 unsigned soft_reset:1; /* Uses soft reset option */
165 unsigned sdtr:1; /* Device supports SDTR messages */
166 unsigned wdtr:1; /* Device supports WDTR messages */
167 unsigned ppr:1; /* Device supports PPR messages */
168 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
169 unsigned simple_tags:1; /* simple queue tag messages are enabled */
170 unsigned was_reset:1; /* There was a bus reset on the bus for
171 * this device */
172 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
173 * because we did a bus reset. */
174 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
175 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
176 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
177 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
178 unsigned no_write_same:1; /* no WRITE SAME command */
179 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
180 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
181 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
182 unsigned skip_vpd_pages:1; /* do not read VPD pages */
183 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
184 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
185 unsigned no_start_on_add:1; /* do not issue start on add */
186 unsigned allow_restart:1; /* issue START_UNIT in error handler */
187 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
188 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
189 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
190 unsigned select_no_atn:1;
191 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
192 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
193 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
194 unsigned last_sector_bug:1; /* do not use multisector accesses on
195 SD_LAST_BUGGY_SECTORS */
196 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
197 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
198 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
199 unsigned security_supported:1; /* Supports Security Protocols */
200 unsigned is_visible:1; /* is the device visible in sysfs */
201 unsigned wce_default_on:1; /* Cache is ON by default */
202 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
203 unsigned broken_fua:1; /* Don't set FUA bit */
204 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
205 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
206 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
207 * creation time */
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
242 ANDROID_KABI_RESERVE(1);
243 ANDROID_KABI_RESERVE(2);
244 ANDROID_KABI_RESERVE(3);
245 ANDROID_KABI_RESERVE(4);
246
247 unsigned long sdev_data[];
248 } __attribute__((aligned(sizeof(unsigned long))));
249
250 #define to_scsi_device(d) \
251 container_of(d, struct scsi_device, sdev_gendev)
252 #define class_to_sdev(d) \
253 container_of(d, struct scsi_device, sdev_dev)
254 #define transport_class_to_sdev(class_dev) \
255 to_scsi_device(class_dev->parent)
256
257 #define sdev_dbg(sdev, fmt, a...) \
258 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
259
260 /*
261 * like scmd_printk, but the device name is passed in
262 * as a string pointer
263 */
264 __printf(4, 5) void
265 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
266 const char *, ...);
267
268 #define sdev_printk(l, sdev, fmt, a...) \
269 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
270
271 __printf(3, 4) void
272 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
273
274 #define scmd_dbg(scmd, fmt, a...) \
275 do { \
276 if ((scmd)->request->rq_disk) \
277 sdev_dbg((scmd)->device, "[%s] " fmt, \
278 (scmd)->request->rq_disk->disk_name, ##a);\
279 else \
280 sdev_dbg((scmd)->device, fmt, ##a); \
281 } while (0)
282
283 enum scsi_target_state {
284 STARGET_CREATED = 1,
285 STARGET_RUNNING,
286 STARGET_REMOVE,
287 STARGET_CREATED_REMOVE,
288 STARGET_DEL,
289 };
290
291 /*
292 * scsi_target: representation of a scsi target, for now, this is only
293 * used for single_lun devices. If no one has active IO to the target,
294 * starget_sdev_user is NULL, else it points to the active sdev.
295 */
296 struct scsi_target {
297 struct scsi_device *starget_sdev_user;
298 struct list_head siblings;
299 struct list_head devices;
300 struct device dev;
301 struct kref reap_ref; /* last put renders target invisible */
302 unsigned int channel;
303 unsigned int id; /* target id ... replace
304 * scsi_device.id eventually */
305 unsigned int create:1; /* signal that it needs to be added */
306 unsigned int single_lun:1; /* Indicates we should only
307 * allow I/O to one of the luns
308 * for the device at a time. */
309 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
310 * means no lun present. */
311 unsigned int no_report_luns:1; /* Don't use
312 * REPORT LUNS for scanning. */
313 unsigned int expecting_lun_change:1; /* A device has reported
314 * a 3F/0E UA, other devices on
315 * the same target will also. */
316 /* commands actually active on LLD. */
317 atomic_t target_busy;
318 atomic_t target_blocked;
319
320 /*
321 * LLDs should set this in the slave_alloc host template callout.
322 * If set to zero then there is not limit.
323 */
324 unsigned int can_queue;
325 unsigned int max_target_blocked;
326 #define SCSI_DEFAULT_TARGET_BLOCKED 3
327
328 char scsi_level;
329 enum scsi_target_state state;
330 void *hostdata; /* available to low-level driver */
331 unsigned long starget_data[]; /* for the transport */
332 /* starget_data must be the last element!!!! */
333 } __attribute__((aligned(sizeof(unsigned long))));
334
335 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
scsi_target(struct scsi_device * sdev)336 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
337 {
338 return to_scsi_target(sdev->sdev_gendev.parent);
339 }
340 #define transport_class_to_starget(class_dev) \
341 to_scsi_target(class_dev->parent)
342
343 #define starget_printk(prefix, starget, fmt, a...) \
344 dev_printk(prefix, &(starget)->dev, fmt, ##a)
345
346 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
347 uint, uint, u64, void *hostdata);
348 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
349 uint target, u64 lun);
350 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
351 extern void scsi_remove_device(struct scsi_device *);
352 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
353 void scsi_attach_vpd(struct scsi_device *sdev);
354
355 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
356 extern int __must_check scsi_device_get(struct scsi_device *);
357 extern void scsi_device_put(struct scsi_device *);
358 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
359 uint, uint, u64);
360 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
361 uint, uint, u64);
362 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
363 u64);
364 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
365 u64);
366 extern void starget_for_each_device(struct scsi_target *, void *,
367 void (*fn)(struct scsi_device *, void *));
368 extern void __starget_for_each_device(struct scsi_target *, void *,
369 void (*fn)(struct scsi_device *,
370 void *));
371
372 /* only exposed to implement shost_for_each_device */
373 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
374 struct scsi_device *);
375
376 /**
377 * shost_for_each_device - iterate over all devices of a host
378 * @sdev: the &struct scsi_device to use as a cursor
379 * @shost: the &struct scsi_host to iterate over
380 *
381 * Iterator that returns each device attached to @shost. This loop
382 * takes a reference on each device and releases it at the end. If
383 * you break out of the loop, you must call scsi_device_put(sdev).
384 */
385 #define shost_for_each_device(sdev, shost) \
386 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
387 (sdev); \
388 (sdev) = __scsi_iterate_devices((shost), (sdev)))
389
390 /**
391 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
392 * @sdev: the &struct scsi_device to use as a cursor
393 * @shost: the &struct scsi_host to iterate over
394 *
395 * Iterator that returns each device attached to @shost. It does _not_
396 * take a reference on the scsi_device, so the whole loop must be
397 * protected by shost->host_lock.
398 *
399 * Note: The only reason to use this is because you need to access the
400 * device list in interrupt context. Otherwise you really want to use
401 * shost_for_each_device instead.
402 */
403 #define __shost_for_each_device(sdev, shost) \
404 list_for_each_entry((sdev), &((shost)->__devices), siblings)
405
406 extern int scsi_change_queue_depth(struct scsi_device *, int);
407 extern int scsi_track_queue_full(struct scsi_device *, int);
408
409 extern int scsi_set_medium_removal(struct scsi_device *, char);
410
411 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
412 unsigned char *buffer, int len, int timeout,
413 int retries, struct scsi_mode_data *data,
414 struct scsi_sense_hdr *);
415 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
416 int modepage, unsigned char *buffer, int len,
417 int timeout, int retries,
418 struct scsi_mode_data *data,
419 struct scsi_sense_hdr *);
420 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
421 int retries, struct scsi_sense_hdr *sshdr);
422 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
423 int buf_len);
424 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
425 unsigned int len, unsigned char opcode);
426 extern int scsi_device_set_state(struct scsi_device *sdev,
427 enum scsi_device_state state);
428 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
429 gfp_t gfpflags);
430 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
431 extern void sdev_evt_send_simple(struct scsi_device *sdev,
432 enum scsi_device_event evt_type, gfp_t gfpflags);
433 extern int scsi_device_quiesce(struct scsi_device *sdev);
434 extern void scsi_device_resume(struct scsi_device *sdev);
435 extern void scsi_target_quiesce(struct scsi_target *);
436 extern void scsi_target_resume(struct scsi_target *);
437 extern void scsi_scan_target(struct device *parent, unsigned int channel,
438 unsigned int id, u64 lun,
439 enum scsi_scan_mode rescan);
440 extern void scsi_target_reap(struct scsi_target *);
441 extern void scsi_target_block(struct device *);
442 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
443 extern void scsi_remove_target(struct device *);
444 extern const char *scsi_device_state_name(enum scsi_device_state);
445 extern int scsi_is_sdev_device(const struct device *);
446 extern int scsi_is_target_device(const struct device *);
447 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
448 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
449 int data_direction, void *buffer, unsigned bufflen,
450 unsigned char *sense, struct scsi_sense_hdr *sshdr,
451 int timeout, int retries, u64 flags,
452 req_flags_t rq_flags, int *resid);
453 /* Make sure any sense buffer is the correct size. */
454 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
455 sshdr, timeout, retries, flags, rq_flags, resid) \
456 ({ \
457 BUILD_BUG_ON((sense) != NULL && \
458 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \
459 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \
460 sense, sshdr, timeout, retries, flags, rq_flags, \
461 resid); \
462 })
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)463 static inline int scsi_execute_req(struct scsi_device *sdev,
464 const unsigned char *cmd, int data_direction, void *buffer,
465 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
466 int retries, int *resid)
467 {
468 return scsi_execute(sdev, cmd, data_direction, buffer,
469 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid);
470 }
471 extern void sdev_disable_disk_events(struct scsi_device *sdev);
472 extern void sdev_enable_disk_events(struct scsi_device *sdev);
473 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
474 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
475
476 #ifdef CONFIG_PM
477 extern int scsi_autopm_get_device(struct scsi_device *);
478 extern void scsi_autopm_put_device(struct scsi_device *);
479 #else
scsi_autopm_get_device(struct scsi_device * d)480 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
scsi_autopm_put_device(struct scsi_device * d)481 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
482 #endif /* CONFIG_PM */
483
scsi_device_reprobe(struct scsi_device * sdev)484 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
485 {
486 return device_reprobe(&sdev->sdev_gendev);
487 }
488
sdev_channel(struct scsi_device * sdev)489 static inline unsigned int sdev_channel(struct scsi_device *sdev)
490 {
491 return sdev->channel;
492 }
493
sdev_id(struct scsi_device * sdev)494 static inline unsigned int sdev_id(struct scsi_device *sdev)
495 {
496 return sdev->id;
497 }
498
499 #define scmd_id(scmd) sdev_id((scmd)->device)
500 #define scmd_channel(scmd) sdev_channel((scmd)->device)
501
502 /*
503 * checks for positions of the SCSI state machine
504 */
scsi_device_online(struct scsi_device * sdev)505 static inline int scsi_device_online(struct scsi_device *sdev)
506 {
507 return (sdev->sdev_state != SDEV_OFFLINE &&
508 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
509 sdev->sdev_state != SDEV_DEL);
510 }
scsi_device_blocked(struct scsi_device * sdev)511 static inline int scsi_device_blocked(struct scsi_device *sdev)
512 {
513 return sdev->sdev_state == SDEV_BLOCK ||
514 sdev->sdev_state == SDEV_CREATED_BLOCK;
515 }
scsi_device_created(struct scsi_device * sdev)516 static inline int scsi_device_created(struct scsi_device *sdev)
517 {
518 return sdev->sdev_state == SDEV_CREATED ||
519 sdev->sdev_state == SDEV_CREATED_BLOCK;
520 }
521
522 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
523 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
524 enum scsi_device_state new_state);
525
526 /* accessor functions for the SCSI parameters */
scsi_device_sync(struct scsi_device * sdev)527 static inline int scsi_device_sync(struct scsi_device *sdev)
528 {
529 return sdev->sdtr;
530 }
scsi_device_wide(struct scsi_device * sdev)531 static inline int scsi_device_wide(struct scsi_device *sdev)
532 {
533 return sdev->wdtr;
534 }
scsi_device_dt(struct scsi_device * sdev)535 static inline int scsi_device_dt(struct scsi_device *sdev)
536 {
537 return sdev->ppr;
538 }
scsi_device_dt_only(struct scsi_device * sdev)539 static inline int scsi_device_dt_only(struct scsi_device *sdev)
540 {
541 if (sdev->inquiry_len < 57)
542 return 0;
543 return (sdev->inquiry[56] & 0x0c) == 0x04;
544 }
scsi_device_ius(struct scsi_device * sdev)545 static inline int scsi_device_ius(struct scsi_device *sdev)
546 {
547 if (sdev->inquiry_len < 57)
548 return 0;
549 return sdev->inquiry[56] & 0x01;
550 }
scsi_device_qas(struct scsi_device * sdev)551 static inline int scsi_device_qas(struct scsi_device *sdev)
552 {
553 if (sdev->inquiry_len < 57)
554 return 0;
555 return sdev->inquiry[56] & 0x02;
556 }
scsi_device_enclosure(struct scsi_device * sdev)557 static inline int scsi_device_enclosure(struct scsi_device *sdev)
558 {
559 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
560 }
561
scsi_device_protection(struct scsi_device * sdev)562 static inline int scsi_device_protection(struct scsi_device *sdev)
563 {
564 if (sdev->no_dif)
565 return 0;
566
567 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
568 }
569
scsi_device_tpgs(struct scsi_device * sdev)570 static inline int scsi_device_tpgs(struct scsi_device *sdev)
571 {
572 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
573 }
574
575 /**
576 * scsi_device_supports_vpd - test if a device supports VPD pages
577 * @sdev: the &struct scsi_device to test
578 *
579 * If the 'try_vpd_pages' flag is set it takes precedence.
580 * Otherwise we will assume VPD pages are supported if the
581 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
582 */
scsi_device_supports_vpd(struct scsi_device * sdev)583 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
584 {
585 /* Attempt VPD inquiry if the device blacklist explicitly calls
586 * for it.
587 */
588 if (sdev->try_vpd_pages)
589 return 1;
590 /*
591 * Although VPD inquiries can go to SCSI-2 type devices,
592 * some USB ones crash on receiving them, and the pages
593 * we currently ask for are mandatory for SPC-2 and beyond
594 */
595 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
596 return 1;
597 return 0;
598 }
599
600 #define MODULE_ALIAS_SCSI_DEVICE(type) \
601 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
602 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
603
604 #endif /* _SCSI_SCSI_DEVICE_H */
605