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 #include <linux/android_kabi.h>
13
14 struct bsg_device;
15 struct device;
16 struct request_queue;
17 struct scsi_cmnd;
18 struct scsi_lun;
19 struct scsi_sense_hdr;
20
21 typedef __u64 __bitwise blist_flags_t;
22
23 #define SCSI_SENSE_BUFFERSIZE 96
24
25 struct scsi_mode_data {
26 __u32 length;
27 __u16 block_descriptor_length;
28 __u8 medium_type;
29 __u8 device_specific;
30 __u8 header_length;
31 __u8 longlba:1;
32 };
33
34 /*
35 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
36 * (for the ascii descriptions) and the state model enforcer:
37 * scsi_lib:scsi_device_set_state().
38 */
39 enum scsi_device_state {
40 SDEV_CREATED = 1, /* device created but not added to sysfs
41 * Only internal commands allowed (for inq) */
42 SDEV_RUNNING, /* device properly configured
43 * All commands allowed */
44 SDEV_CANCEL, /* beginning to delete device
45 * Only error handler commands allowed */
46 SDEV_DEL, /* device deleted
47 * no commands allowed */
48 SDEV_QUIESCE, /* Device quiescent. No block commands
49 * will be accepted, only specials (which
50 * originate in the mid-layer) */
51 SDEV_OFFLINE, /* Device offlined (by error handling or
52 * user request */
53 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
54 SDEV_BLOCK, /* Device blocked by scsi lld. No
55 * scsi commands from user or midlayer
56 * should be issued to the scsi
57 * lld. */
58 SDEV_CREATED_BLOCK, /* same as above but for created devices */
59 };
60
61 enum scsi_scan_mode {
62 SCSI_SCAN_INITIAL = 0,
63 SCSI_SCAN_RESCAN,
64 SCSI_SCAN_MANUAL,
65 };
66
67 enum scsi_device_event {
68 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
69 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
70 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
71 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
72 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
73 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
74 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
75 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */
76
77 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
78 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED,
79
80 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
81 };
82
83 struct scsi_event {
84 enum scsi_device_event evt_type;
85 struct list_head node;
86
87 /* put union of data structures, for non-simple event types,
88 * here
89 */
90 };
91
92 /**
93 * struct scsi_vpd - SCSI Vital Product Data
94 * @rcu: For kfree_rcu().
95 * @len: Length in bytes of @data.
96 * @data: VPD data as defined in various T10 SCSI standard documents.
97 */
98 struct scsi_vpd {
99 struct rcu_head rcu;
100 int len;
101 unsigned char data[];
102 };
103
104 struct scsi_device {
105 struct Scsi_Host *host;
106 struct request_queue *request_queue;
107
108 /* the next two are protected by the host->host_lock */
109 struct list_head siblings; /* list of all devices on this host */
110 struct list_head same_target_siblings; /* just the devices sharing same target id */
111
112 struct sbitmap budget_map;
113 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
114
115 atomic_t restarts;
116 spinlock_t list_lock;
117 struct list_head starved_entry;
118 unsigned short queue_depth; /* How deep of a queue we want */
119 unsigned short max_queue_depth; /* max queue depth */
120 unsigned short last_queue_full_depth; /* These two are used by */
121 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
122 unsigned long last_queue_full_time; /* last queue full time */
123 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
124 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
125
126 unsigned long last_queue_ramp_up; /* last queue ramp up time */
127
128 unsigned int id, channel;
129 u64 lun;
130 unsigned int manufacturer; /* Manufacturer of device, for using
131 * vendor-specific cmd's */
132 unsigned sector_size; /* size in bytes */
133
134 void *hostdata; /* available to low-level driver */
135 unsigned char type;
136 char scsi_level;
137 char inq_periph_qual; /* PQ from INQUIRY data */
138 struct mutex inquiry_mutex;
139 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
140 unsigned char * inquiry; /* INQUIRY response data */
141 const char * vendor; /* [back_compat] point into 'inquiry' ... */
142 const char * model; /* ... after scan; point to static string */
143 const char * rev; /* ... "nullnullnullnull" before scan */
144
145 #define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */
146 struct scsi_vpd __rcu *vpd_pg0;
147 struct scsi_vpd __rcu *vpd_pg83;
148 struct scsi_vpd __rcu *vpd_pg80;
149 struct scsi_vpd __rcu *vpd_pg89;
150 struct scsi_vpd __rcu *vpd_pgb0;
151 struct scsi_vpd __rcu *vpd_pgb1;
152 struct scsi_vpd __rcu *vpd_pgb2;
153
154 struct scsi_target *sdev_target;
155
156 blist_flags_t sdev_bflags; /* black/white flags as also found in
157 * scsi_devinfo.[hc]. For now used only to
158 * pass settings from slave_alloc to scsi
159 * core. */
160 unsigned int eh_timeout; /* Error handling timeout */
161 unsigned removable:1;
162 unsigned changed:1; /* Data invalid due to media change */
163 unsigned busy:1; /* Used to prevent races */
164 unsigned lockable:1; /* Able to prevent media removal */
165 unsigned locked:1; /* Media removal disabled */
166 unsigned borken:1; /* Tell the Seagate driver to be
167 * painfully slow on this device */
168 unsigned disconnect:1; /* can disconnect */
169 unsigned soft_reset:1; /* Uses soft reset option */
170 unsigned sdtr:1; /* Device supports SDTR messages */
171 unsigned wdtr:1; /* Device supports WDTR messages */
172 unsigned ppr:1; /* Device supports PPR messages */
173 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
174 unsigned simple_tags:1; /* simple queue tag messages are enabled */
175 unsigned was_reset:1; /* There was a bus reset on the bus for
176 * this device */
177 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
178 * because we did a bus reset. */
179 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
180 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
181 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
182 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
183 unsigned no_write_same:1; /* no WRITE SAME command */
184 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
185 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
186 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
187 unsigned skip_vpd_pages:1; /* do not read VPD pages */
188 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
189 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
190 unsigned no_start_on_add:1; /* do not issue start on add */
191 unsigned allow_restart:1; /* issue START_UNIT in error handler */
192 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
193 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
194 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
195 unsigned select_no_atn:1;
196 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
197 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
198 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
199 unsigned last_sector_bug:1; /* do not use multisector accesses on
200 SD_LAST_BUGGY_SECTORS */
201 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
202 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
203 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
204 unsigned security_supported:1; /* Supports Security Protocols */
205 unsigned is_visible:1; /* is the device visible in sysfs */
206 unsigned wce_default_on:1; /* Cache is ON by default */
207 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
208 unsigned broken_fua:1; /* Don't set FUA bit */
209 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
210 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
211 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
212 * creation time */
213 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
214 unsigned silence_suspend:1; /* Do not print runtime PM related messages */
215 unsigned no_vpd_size:1; /* No VPD size reported in header */
216
217 unsigned int queue_stopped; /* request queue is quiesced */
218 bool offline_already; /* Device offline message logged */
219
220 atomic_t disk_events_disable_depth; /* disable depth for disk events */
221
222 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
223 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
224 struct list_head event_list; /* asserted events */
225 struct work_struct event_work;
226
227 unsigned int max_device_blocked; /* what device_blocked counts down from */
228 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
229
230 atomic_t iorequest_cnt;
231 atomic_t iodone_cnt;
232 atomic_t ioerr_cnt;
233 atomic_t iotmo_cnt;
234
235 struct device sdev_gendev,
236 sdev_dev;
237
238 struct execute_work ew; /* used to get process context on put */
239 struct work_struct requeue_work;
240
241 struct scsi_device_handler *handler;
242 void *handler_data;
243
244 size_t dma_drain_len;
245 void *dma_drain_buf;
246
247 unsigned int sg_timeout;
248 unsigned int sg_reserved_size;
249
250 struct bsg_device *bsg_dev;
251 unsigned char access_state;
252 struct mutex state_mutex;
253 enum scsi_device_state sdev_state;
254 struct task_struct *quiesced_by;
255
256 ANDROID_KABI_RESERVE(1);
257 ANDROID_KABI_RESERVE(2);
258 ANDROID_KABI_RESERVE(3);
259 ANDROID_KABI_RESERVE(4);
260
261 unsigned long sdev_data[];
262 } __attribute__((aligned(sizeof(unsigned long))));
263
264 #define to_scsi_device(d) \
265 container_of(d, struct scsi_device, sdev_gendev)
266 #define class_to_sdev(d) \
267 container_of(d, struct scsi_device, sdev_dev)
268 #define transport_class_to_sdev(class_dev) \
269 to_scsi_device(class_dev->parent)
270
271 #define sdev_dbg(sdev, fmt, a...) \
272 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
273
274 /*
275 * like scmd_printk, but the device name is passed in
276 * as a string pointer
277 */
278 __printf(4, 5) void
279 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
280 const char *, ...);
281
282 #define sdev_printk(l, sdev, fmt, a...) \
283 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
284
285 __printf(3, 4) void
286 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
287
288 #define scmd_dbg(scmd, fmt, a...) \
289 do { \
290 struct request *__rq = scsi_cmd_to_rq((scmd)); \
291 \
292 if (__rq->q->disk) \
293 sdev_dbg((scmd)->device, "[%s] " fmt, \
294 __rq->q->disk->disk_name, ##a); \
295 else \
296 sdev_dbg((scmd)->device, fmt, ##a); \
297 } while (0)
298
299 enum scsi_target_state {
300 STARGET_CREATED = 1,
301 STARGET_RUNNING,
302 STARGET_REMOVE,
303 STARGET_CREATED_REMOVE,
304 STARGET_DEL,
305 };
306
307 /*
308 * scsi_target: representation of a scsi target, for now, this is only
309 * used for single_lun devices. If no one has active IO to the target,
310 * starget_sdev_user is NULL, else it points to the active sdev.
311 */
312 struct scsi_target {
313 struct scsi_device *starget_sdev_user;
314 struct list_head siblings;
315 struct list_head devices;
316 struct device dev;
317 struct kref reap_ref; /* last put renders target invisible */
318 unsigned int channel;
319 unsigned int id; /* target id ... replace
320 * scsi_device.id eventually */
321 unsigned int create:1; /* signal that it needs to be added */
322 unsigned int single_lun:1; /* Indicates we should only
323 * allow I/O to one of the luns
324 * for the device at a time. */
325 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
326 * means no lun present. */
327 unsigned int no_report_luns:1; /* Don't use
328 * REPORT LUNS for scanning. */
329 unsigned int expecting_lun_change:1; /* A device has reported
330 * a 3F/0E UA, other devices on
331 * the same target will also. */
332 /* commands actually active on LLD. */
333 atomic_t target_busy;
334 atomic_t target_blocked;
335
336 /*
337 * LLDs should set this in the slave_alloc host template callout.
338 * If set to zero then there is not limit.
339 */
340 unsigned int can_queue;
341 unsigned int max_target_blocked;
342 #define SCSI_DEFAULT_TARGET_BLOCKED 3
343
344 char scsi_level;
345 enum scsi_target_state state;
346 void *hostdata; /* available to low-level driver */
347 unsigned long starget_data[]; /* for the transport */
348 /* starget_data must be the last element!!!! */
349 } __attribute__((aligned(sizeof(unsigned long))));
350
351 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
scsi_target(struct scsi_device * sdev)352 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
353 {
354 return to_scsi_target(sdev->sdev_gendev.parent);
355 }
356 #define transport_class_to_starget(class_dev) \
357 to_scsi_target(class_dev->parent)
358
359 #define starget_printk(prefix, starget, fmt, a...) \
360 dev_printk(prefix, &(starget)->dev, fmt, ##a)
361
362 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
363 uint, uint, u64, void *hostdata);
364 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
365 uint target, u64 lun);
366 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
367 extern void scsi_remove_device(struct scsi_device *);
368 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
369 void scsi_attach_vpd(struct scsi_device *sdev);
370
371 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
372 extern int __must_check scsi_device_get(struct scsi_device *);
373 extern void scsi_device_put(struct scsi_device *);
374 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
375 uint, uint, u64);
376 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
377 uint, uint, u64);
378 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
379 u64);
380 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
381 u64);
382 extern void starget_for_each_device(struct scsi_target *, void *,
383 void (*fn)(struct scsi_device *, void *));
384 extern void __starget_for_each_device(struct scsi_target *, void *,
385 void (*fn)(struct scsi_device *,
386 void *));
387
388 /* only exposed to implement shost_for_each_device */
389 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
390 struct scsi_device *);
391
392 /**
393 * shost_for_each_device - iterate over all devices of a host
394 * @sdev: the &struct scsi_device to use as a cursor
395 * @shost: the &struct scsi_host to iterate over
396 *
397 * Iterator that returns each device attached to @shost. This loop
398 * takes a reference on each device and releases it at the end. If
399 * you break out of the loop, you must call scsi_device_put(sdev).
400 */
401 #define shost_for_each_device(sdev, shost) \
402 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
403 (sdev); \
404 (sdev) = __scsi_iterate_devices((shost), (sdev)))
405
406 /**
407 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
408 * @sdev: the &struct scsi_device to use as a cursor
409 * @shost: the &struct scsi_host to iterate over
410 *
411 * Iterator that returns each device attached to @shost. It does _not_
412 * take a reference on the scsi_device, so the whole loop must be
413 * protected by shost->host_lock.
414 *
415 * Note: The only reason to use this is because you need to access the
416 * device list in interrupt context. Otherwise you really want to use
417 * shost_for_each_device instead.
418 */
419 #define __shost_for_each_device(sdev, shost) \
420 list_for_each_entry((sdev), &((shost)->__devices), siblings)
421
422 extern int scsi_change_queue_depth(struct scsi_device *, int);
423 extern int scsi_track_queue_full(struct scsi_device *, int);
424
425 extern int scsi_set_medium_removal(struct scsi_device *, char);
426
427 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
428 unsigned char *buffer, int len, int timeout,
429 int retries, struct scsi_mode_data *data,
430 struct scsi_sense_hdr *);
431 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
432 unsigned char *buffer, int len, int timeout,
433 int retries, struct scsi_mode_data *data,
434 struct scsi_sense_hdr *);
435 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
436 int retries, struct scsi_sense_hdr *sshdr);
437 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
438 int buf_len);
439 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
440 unsigned int len, unsigned char opcode);
441 extern int scsi_device_set_state(struct scsi_device *sdev,
442 enum scsi_device_state state);
443 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
444 gfp_t gfpflags);
445 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
446 extern void sdev_evt_send_simple(struct scsi_device *sdev,
447 enum scsi_device_event evt_type, gfp_t gfpflags);
448 extern int scsi_device_quiesce(struct scsi_device *sdev);
449 extern void scsi_device_resume(struct scsi_device *sdev);
450 extern void scsi_target_quiesce(struct scsi_target *);
451 extern void scsi_target_resume(struct scsi_target *);
452 extern void scsi_scan_target(struct device *parent, unsigned int channel,
453 unsigned int id, u64 lun,
454 enum scsi_scan_mode rescan);
455 extern void scsi_target_reap(struct scsi_target *);
456 extern void scsi_target_block(struct device *);
457 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
458 extern void scsi_remove_target(struct device *);
459 extern const char *scsi_device_state_name(enum scsi_device_state);
460 extern int scsi_is_sdev_device(const struct device *);
461 extern int scsi_is_target_device(const struct device *);
462 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
463
464 /* Optional arguments to scsi_execute_cmd */
465 struct scsi_exec_args {
466 unsigned char *sense; /* sense buffer */
467 unsigned int sense_len; /* sense buffer len */
468 struct scsi_sense_hdr *sshdr; /* decoded sense header */
469 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */
470 int scmd_flags; /* SCMD flags */
471 int *resid; /* residual length */
472 };
473
474 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
475 blk_opf_t opf, void *buffer, unsigned int bufflen,
476 int timeout, int retries,
477 const struct scsi_exec_args *args);
478
479 extern void sdev_disable_disk_events(struct scsi_device *sdev);
480 extern void sdev_enable_disk_events(struct scsi_device *sdev);
481 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
482 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
483
484 #ifdef CONFIG_PM
485 extern int scsi_autopm_get_device(struct scsi_device *);
486 extern void scsi_autopm_put_device(struct scsi_device *);
487 #else
scsi_autopm_get_device(struct scsi_device * d)488 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
scsi_autopm_put_device(struct scsi_device * d)489 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
490 #endif /* CONFIG_PM */
491
scsi_device_reprobe(struct scsi_device * sdev)492 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
493 {
494 return device_reprobe(&sdev->sdev_gendev);
495 }
496
sdev_channel(struct scsi_device * sdev)497 static inline unsigned int sdev_channel(struct scsi_device *sdev)
498 {
499 return sdev->channel;
500 }
501
sdev_id(struct scsi_device * sdev)502 static inline unsigned int sdev_id(struct scsi_device *sdev)
503 {
504 return sdev->id;
505 }
506
507 #define scmd_id(scmd) sdev_id((scmd)->device)
508 #define scmd_channel(scmd) sdev_channel((scmd)->device)
509
510 /*
511 * checks for positions of the SCSI state machine
512 */
scsi_device_online(struct scsi_device * sdev)513 static inline int scsi_device_online(struct scsi_device *sdev)
514 {
515 return (sdev->sdev_state != SDEV_OFFLINE &&
516 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
517 sdev->sdev_state != SDEV_DEL);
518 }
scsi_device_blocked(struct scsi_device * sdev)519 static inline int scsi_device_blocked(struct scsi_device *sdev)
520 {
521 return sdev->sdev_state == SDEV_BLOCK ||
522 sdev->sdev_state == SDEV_CREATED_BLOCK;
523 }
scsi_device_created(struct scsi_device * sdev)524 static inline int scsi_device_created(struct scsi_device *sdev)
525 {
526 return sdev->sdev_state == SDEV_CREATED ||
527 sdev->sdev_state == SDEV_CREATED_BLOCK;
528 }
529
530 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
531 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
532 enum scsi_device_state new_state);
533
534 /* accessor functions for the SCSI parameters */
scsi_device_sync(struct scsi_device * sdev)535 static inline int scsi_device_sync(struct scsi_device *sdev)
536 {
537 return sdev->sdtr;
538 }
scsi_device_wide(struct scsi_device * sdev)539 static inline int scsi_device_wide(struct scsi_device *sdev)
540 {
541 return sdev->wdtr;
542 }
scsi_device_dt(struct scsi_device * sdev)543 static inline int scsi_device_dt(struct scsi_device *sdev)
544 {
545 return sdev->ppr;
546 }
scsi_device_dt_only(struct scsi_device * sdev)547 static inline int scsi_device_dt_only(struct scsi_device *sdev)
548 {
549 if (sdev->inquiry_len < 57)
550 return 0;
551 return (sdev->inquiry[56] & 0x0c) == 0x04;
552 }
scsi_device_ius(struct scsi_device * sdev)553 static inline int scsi_device_ius(struct scsi_device *sdev)
554 {
555 if (sdev->inquiry_len < 57)
556 return 0;
557 return sdev->inquiry[56] & 0x01;
558 }
scsi_device_qas(struct scsi_device * sdev)559 static inline int scsi_device_qas(struct scsi_device *sdev)
560 {
561 if (sdev->inquiry_len < 57)
562 return 0;
563 return sdev->inquiry[56] & 0x02;
564 }
scsi_device_enclosure(struct scsi_device * sdev)565 static inline int scsi_device_enclosure(struct scsi_device *sdev)
566 {
567 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
568 }
569
scsi_device_protection(struct scsi_device * sdev)570 static inline int scsi_device_protection(struct scsi_device *sdev)
571 {
572 if (sdev->no_dif)
573 return 0;
574
575 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
576 }
577
scsi_device_tpgs(struct scsi_device * sdev)578 static inline int scsi_device_tpgs(struct scsi_device *sdev)
579 {
580 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
581 }
582
583 /**
584 * scsi_device_supports_vpd - test if a device supports VPD pages
585 * @sdev: the &struct scsi_device to test
586 *
587 * If the 'try_vpd_pages' flag is set it takes precedence.
588 * Otherwise we will assume VPD pages are supported if the
589 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
590 */
scsi_device_supports_vpd(struct scsi_device * sdev)591 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
592 {
593 /* Attempt VPD inquiry if the device blacklist explicitly calls
594 * for it.
595 */
596 if (sdev->try_vpd_pages)
597 return 1;
598 /*
599 * Although VPD inquiries can go to SCSI-2 type devices,
600 * some USB ones crash on receiving them, and the pages
601 * we currently ask for are mandatory for SPC-2 and beyond
602 */
603 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
604 return 1;
605 return 0;
606 }
607
scsi_device_busy(struct scsi_device * sdev)608 static inline int scsi_device_busy(struct scsi_device *sdev)
609 {
610 return sbitmap_weight(&sdev->budget_map);
611 }
612
613 #define MODULE_ALIAS_SCSI_DEVICE(type) \
614 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
615 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
616
617 #endif /* _SCSI_SCSI_DEVICE_H */
618