1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SCSI_SCSI_DEVICE_H
3 #define _SCSI_SCSI_DEVICE_H
4
5 #include <linux/list.h>
6 #include <linux/spinlock.h>
7 #include <linux/workqueue.h>
8 #include <linux/blk-mq.h>
9 #include <scsi/scsi.h>
10 #include <linux/atomic.h>
11 #include <linux/sbitmap.h>
12
13 struct bsg_device;
14 struct device;
15 struct request_queue;
16 struct scsi_cmnd;
17 struct scsi_lun;
18 struct scsi_sense_hdr;
19
20 typedef __u64 __bitwise blist_flags_t;
21
22 #define SCSI_SENSE_BUFFERSIZE 96
23
24 struct scsi_mode_data {
25 __u32 length;
26 __u16 block_descriptor_length;
27 __u8 medium_type;
28 __u8 device_specific;
29 __u8 header_length;
30 __u8 longlba:1;
31 };
32
33 /*
34 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
35 * (for the ascii descriptions) and the state model enforcer:
36 * scsi_lib:scsi_device_set_state().
37 */
38 enum scsi_device_state {
39 SDEV_CREATED = 1, /* device created but not added to sysfs
40 * Only internal commands allowed (for inq) */
41 SDEV_RUNNING, /* device properly configured
42 * All commands allowed */
43 SDEV_CANCEL, /* beginning to delete device
44 * Only error handler commands allowed */
45 SDEV_DEL, /* device deleted
46 * no commands allowed */
47 SDEV_QUIESCE, /* Device quiescent. No block commands
48 * will be accepted, only specials (which
49 * originate in the mid-layer) */
50 SDEV_OFFLINE, /* Device offlined (by error handling or
51 * user request */
52 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
53 SDEV_BLOCK, /* Device blocked by scsi lld. No
54 * scsi commands from user or midlayer
55 * should be issued to the scsi
56 * lld. */
57 SDEV_CREATED_BLOCK, /* same as above but for created devices */
58 };
59
60 enum scsi_scan_mode {
61 SCSI_SCAN_INITIAL = 0,
62 SCSI_SCAN_RESCAN,
63 SCSI_SCAN_MANUAL,
64 };
65
66 enum scsi_device_event {
67 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
68 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
69 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
70 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
71 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
72 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
73 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
74 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */
75
76 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
77 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED,
78
79 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
80 };
81
82 struct scsi_event {
83 enum scsi_device_event evt_type;
84 struct list_head node;
85
86 /* put union of data structures, for non-simple event types,
87 * here
88 */
89 };
90
91 /**
92 * struct scsi_vpd - SCSI Vital Product Data
93 * @rcu: For kfree_rcu().
94 * @len: Length in bytes of @data.
95 * @data: VPD data as defined in various T10 SCSI standard documents.
96 */
97 struct scsi_vpd {
98 struct rcu_head rcu;
99 int len;
100 unsigned char data[];
101 };
102
103 enum scsi_vpd_parameters {
104 SCSI_VPD_HEADER_SIZE = 4,
105 };
106
107 struct scsi_device {
108 struct Scsi_Host *host;
109 struct request_queue *request_queue;
110
111 /* the next two are protected by the host->host_lock */
112 struct list_head siblings; /* list of all devices on this host */
113 struct list_head same_target_siblings; /* just the devices sharing same target id */
114
115 struct sbitmap budget_map;
116 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
117
118 atomic_t restarts;
119 spinlock_t list_lock;
120 struct list_head starved_entry;
121 unsigned short queue_depth; /* How deep of a queue we want */
122 unsigned short max_queue_depth; /* max queue depth */
123 unsigned short last_queue_full_depth; /* These two are used by */
124 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
125 unsigned long last_queue_full_time; /* last queue full time */
126 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
127 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
128
129 unsigned long last_queue_ramp_up; /* last queue ramp up time */
130
131 unsigned int id, channel;
132 u64 lun;
133 unsigned int manufacturer; /* Manufacturer of device, for using
134 * vendor-specific cmd's */
135 unsigned sector_size; /* size in bytes */
136
137 void *hostdata; /* available to low-level driver */
138 unsigned char type;
139 char scsi_level;
140 char inq_periph_qual; /* PQ from INQUIRY data */
141 struct mutex inquiry_mutex;
142 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
143 unsigned char * inquiry; /* INQUIRY response data */
144 const char * vendor; /* [back_compat] point into 'inquiry' ... */
145 const char * model; /* ... after scan; point to static string */
146 const char * rev; /* ... "nullnullnullnull" before scan */
147
148 #define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */
149 struct scsi_vpd __rcu *vpd_pg0;
150 struct scsi_vpd __rcu *vpd_pg83;
151 struct scsi_vpd __rcu *vpd_pg80;
152 struct scsi_vpd __rcu *vpd_pg89;
153 struct scsi_vpd __rcu *vpd_pgb0;
154 struct scsi_vpd __rcu *vpd_pgb1;
155 struct scsi_vpd __rcu *vpd_pgb2;
156
157 struct scsi_target *sdev_target;
158
159 blist_flags_t sdev_bflags; /* black/white flags as also found in
160 * scsi_devinfo.[hc]. For now used only to
161 * pass settings from slave_alloc to scsi
162 * core. */
163 unsigned int eh_timeout; /* Error handling timeout */
164
165 /*
166 * If true, let the high-level device driver (sd) manage the device
167 * power state for system suspend/resume (suspend to RAM and
168 * hibernation) operations.
169 */
170 bool manage_system_start_stop;
171
172 /*
173 * If true, let the high-level device driver (sd) manage the device
174 * power state for runtime device suspand and resume operations.
175 */
176 bool manage_runtime_start_stop;
177
178 /*
179 * If true, let the high-level device driver (sd) manage the device
180 * power state for system shutdown (power off) operations.
181 */
182 bool manage_shutdown;
183
184 unsigned removable:1;
185 unsigned changed:1; /* Data invalid due to media change */
186 unsigned busy:1; /* Used to prevent races */
187 unsigned lockable:1; /* Able to prevent media removal */
188 unsigned locked:1; /* Media removal disabled */
189 unsigned borken:1; /* Tell the Seagate driver to be
190 * painfully slow on this device */
191 unsigned disconnect:1; /* can disconnect */
192 unsigned soft_reset:1; /* Uses soft reset option */
193 unsigned sdtr:1; /* Device supports SDTR messages */
194 unsigned wdtr:1; /* Device supports WDTR messages */
195 unsigned ppr:1; /* Device supports PPR messages */
196 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
197 unsigned simple_tags:1; /* simple queue tag messages are enabled */
198 unsigned was_reset:1; /* There was a bus reset on the bus for
199 * this device */
200 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
201 * because we did a bus reset. */
202 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
203 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
204 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
205 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
206 unsigned no_write_same:1; /* no WRITE SAME command */
207 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
208 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */
209 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
210 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
211 unsigned skip_vpd_pages:1; /* do not read VPD pages */
212 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
213 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
214 unsigned no_start_on_add:1; /* do not issue start on add */
215 unsigned allow_restart:1; /* issue START_UNIT in error handler */
216 unsigned no_start_on_resume:1; /* Do not issue START_STOP_UNIT on resume */
217 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
218 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
219 unsigned select_no_atn:1;
220 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
221 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
222 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
223 unsigned last_sector_bug:1; /* do not use multisector accesses on
224 SD_LAST_BUGGY_SECTORS */
225 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
226 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
227 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
228 unsigned security_supported:1; /* Supports Security Protocols */
229 unsigned is_visible:1; /* is the device visible in sysfs */
230 unsigned wce_default_on:1; /* Cache is ON by default */
231 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
232 unsigned broken_fua:1; /* Don't set FUA bit */
233 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
234 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
235 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
236 * creation time */
237 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
238 unsigned silence_suspend:1; /* Do not print runtime PM related messages */
239 unsigned no_vpd_size:1; /* No VPD size reported in header */
240
241 unsigned cdl_supported:1; /* Command duration limits supported */
242 unsigned cdl_enable:1; /* Enable/disable Command duration limits */
243
244 unsigned int queue_stopped; /* request queue is quiesced */
245 bool offline_already; /* Device offline message logged */
246
247 atomic_t disk_events_disable_depth; /* disable depth for disk events */
248
249 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
250 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
251 struct list_head event_list; /* asserted events */
252 struct work_struct event_work;
253
254 unsigned int max_device_blocked; /* what device_blocked counts down from */
255 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
256
257 atomic_t iorequest_cnt;
258 atomic_t iodone_cnt;
259 atomic_t ioerr_cnt;
260 atomic_t iotmo_cnt;
261
262 struct device sdev_gendev,
263 sdev_dev;
264
265 struct work_struct requeue_work;
266
267 struct scsi_device_handler *handler;
268 void *handler_data;
269
270 size_t dma_drain_len;
271 void *dma_drain_buf;
272
273 unsigned int sg_timeout;
274 unsigned int sg_reserved_size;
275
276 struct bsg_device *bsg_dev;
277 unsigned char access_state;
278 struct mutex state_mutex;
279 enum scsi_device_state sdev_state;
280 struct task_struct *quiesced_by;
281 unsigned long sdev_data[];
282 } __attribute__((aligned(sizeof(unsigned long))));
283
284 #define to_scsi_device(d) \
285 container_of(d, struct scsi_device, sdev_gendev)
286 #define class_to_sdev(d) \
287 container_of(d, struct scsi_device, sdev_dev)
288 #define transport_class_to_sdev(class_dev) \
289 to_scsi_device(class_dev->parent)
290
291 #define sdev_dbg(sdev, fmt, a...) \
292 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
293
294 /*
295 * like scmd_printk, but the device name is passed in
296 * as a string pointer
297 */
298 __printf(4, 5) void
299 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
300 const char *, ...);
301
302 #define sdev_printk(l, sdev, fmt, a...) \
303 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
304
305 __printf(3, 4) void
306 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
307
308 #define scmd_dbg(scmd, fmt, a...) \
309 do { \
310 struct request *__rq = scsi_cmd_to_rq((scmd)); \
311 \
312 if (__rq->q->disk) \
313 sdev_dbg((scmd)->device, "[%s] " fmt, \
314 __rq->q->disk->disk_name, ##a); \
315 else \
316 sdev_dbg((scmd)->device, fmt, ##a); \
317 } while (0)
318
319 enum scsi_target_state {
320 STARGET_CREATED = 1,
321 STARGET_RUNNING,
322 STARGET_REMOVE,
323 STARGET_CREATED_REMOVE,
324 STARGET_DEL,
325 };
326
327 /*
328 * scsi_target: representation of a scsi target, for now, this is only
329 * used for single_lun devices. If no one has active IO to the target,
330 * starget_sdev_user is NULL, else it points to the active sdev.
331 */
332 struct scsi_target {
333 struct scsi_device *starget_sdev_user;
334 struct list_head siblings;
335 struct list_head devices;
336 struct device dev;
337 struct kref reap_ref; /* last put renders target invisible */
338 unsigned int channel;
339 unsigned int id; /* target id ... replace
340 * scsi_device.id eventually */
341 unsigned int create:1; /* signal that it needs to be added */
342 unsigned int single_lun:1; /* Indicates we should only
343 * allow I/O to one of the luns
344 * for the device at a time. */
345 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
346 * means no lun present. */
347 unsigned int no_report_luns:1; /* Don't use
348 * REPORT LUNS for scanning. */
349 unsigned int expecting_lun_change:1; /* A device has reported
350 * a 3F/0E UA, other devices on
351 * the same target will also. */
352 /* commands actually active on LLD. */
353 atomic_t target_busy;
354 atomic_t target_blocked;
355
356 /*
357 * LLDs should set this in the slave_alloc host template callout.
358 * If set to zero then there is not limit.
359 */
360 unsigned int can_queue;
361 unsigned int max_target_blocked;
362 #define SCSI_DEFAULT_TARGET_BLOCKED 3
363
364 char scsi_level;
365 enum scsi_target_state state;
366 void *hostdata; /* available to low-level driver */
367 unsigned long starget_data[]; /* for the transport */
368 /* starget_data must be the last element!!!! */
369 } __attribute__((aligned(sizeof(unsigned long))));
370
371 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
scsi_target(struct scsi_device * sdev)372 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
373 {
374 return to_scsi_target(sdev->sdev_gendev.parent);
375 }
376 #define transport_class_to_starget(class_dev) \
377 to_scsi_target(class_dev->parent)
378
379 #define starget_printk(prefix, starget, fmt, a...) \
380 dev_printk(prefix, &(starget)->dev, fmt, ##a)
381
382 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
383 uint, uint, u64, void *hostdata);
384 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
385 uint target, u64 lun);
386 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
387 extern void scsi_remove_device(struct scsi_device *);
388 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
389 void scsi_attach_vpd(struct scsi_device *sdev);
390 void scsi_cdl_check(struct scsi_device *sdev);
391 int scsi_cdl_enable(struct scsi_device *sdev, bool enable);
392
393 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
394 extern int __must_check scsi_device_get(struct scsi_device *);
395 extern void scsi_device_put(struct scsi_device *);
396 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
397 uint, uint, u64);
398 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
399 uint, uint, u64);
400 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
401 u64);
402 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
403 u64);
404 extern void starget_for_each_device(struct scsi_target *, void *,
405 void (*fn)(struct scsi_device *, void *));
406 extern void __starget_for_each_device(struct scsi_target *, void *,
407 void (*fn)(struct scsi_device *,
408 void *));
409
410 /* only exposed to implement shost_for_each_device */
411 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
412 struct scsi_device *);
413
414 /**
415 * shost_for_each_device - iterate over all devices of a host
416 * @sdev: the &struct scsi_device to use as a cursor
417 * @shost: the &struct scsi_host to iterate over
418 *
419 * Iterator that returns each device attached to @shost. This loop
420 * takes a reference on each device and releases it at the end. If
421 * you break out of the loop, you must call scsi_device_put(sdev).
422 */
423 #define shost_for_each_device(sdev, shost) \
424 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
425 (sdev); \
426 (sdev) = __scsi_iterate_devices((shost), (sdev)))
427
428 /**
429 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
430 * @sdev: the &struct scsi_device to use as a cursor
431 * @shost: the &struct scsi_host to iterate over
432 *
433 * Iterator that returns each device attached to @shost. It does _not_
434 * take a reference on the scsi_device, so the whole loop must be
435 * protected by shost->host_lock.
436 *
437 * Note: The only reason to use this is because you need to access the
438 * device list in interrupt context. Otherwise you really want to use
439 * shost_for_each_device instead.
440 */
441 #define __shost_for_each_device(sdev, shost) \
442 list_for_each_entry((sdev), &((shost)->__devices), siblings)
443
444 extern int scsi_change_queue_depth(struct scsi_device *, int);
445 extern int scsi_track_queue_full(struct scsi_device *, int);
446
447 extern int scsi_set_medium_removal(struct scsi_device *, char);
448
449 int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
450 int subpage, unsigned char *buffer, int len, int timeout,
451 int retries, struct scsi_mode_data *data,
452 struct scsi_sense_hdr *);
453 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
454 unsigned char *buffer, int len, int timeout,
455 int retries, struct scsi_mode_data *data,
456 struct scsi_sense_hdr *);
457 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
458 int retries, struct scsi_sense_hdr *sshdr);
459 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
460 int buf_len);
461 int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
462 unsigned int len, unsigned char opcode,
463 unsigned short sa);
464 extern int scsi_device_set_state(struct scsi_device *sdev,
465 enum scsi_device_state state);
466 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
467 gfp_t gfpflags);
468 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
469 extern void sdev_evt_send_simple(struct scsi_device *sdev,
470 enum scsi_device_event evt_type, gfp_t gfpflags);
471 extern int scsi_device_quiesce(struct scsi_device *sdev);
472 extern void scsi_device_resume(struct scsi_device *sdev);
473 extern void scsi_target_quiesce(struct scsi_target *);
474 extern void scsi_target_resume(struct scsi_target *);
475 extern void scsi_scan_target(struct device *parent, unsigned int channel,
476 unsigned int id, u64 lun,
477 enum scsi_scan_mode rescan);
478 extern void scsi_target_reap(struct scsi_target *);
479 void scsi_block_targets(struct Scsi_Host *shost, struct device *dev);
480 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
481 extern void scsi_remove_target(struct device *);
482 extern const char *scsi_device_state_name(enum scsi_device_state);
483 extern int scsi_is_sdev_device(const struct device *);
484 extern int scsi_is_target_device(const struct device *);
485 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
486
487 /* Optional arguments to scsi_execute_cmd */
488 struct scsi_exec_args {
489 unsigned char *sense; /* sense buffer */
490 unsigned int sense_len; /* sense buffer len */
491 struct scsi_sense_hdr *sshdr; /* decoded sense header */
492 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */
493 int scmd_flags; /* SCMD flags */
494 int *resid; /* residual length */
495 };
496
497 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
498 blk_opf_t opf, void *buffer, unsigned int bufflen,
499 int timeout, int retries,
500 const struct scsi_exec_args *args);
501
502 extern void sdev_disable_disk_events(struct scsi_device *sdev);
503 extern void sdev_enable_disk_events(struct scsi_device *sdev);
504 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
505 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
506
507 #ifdef CONFIG_PM
508 extern int scsi_autopm_get_device(struct scsi_device *);
509 extern void scsi_autopm_put_device(struct scsi_device *);
510 #else
scsi_autopm_get_device(struct scsi_device * d)511 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
scsi_autopm_put_device(struct scsi_device * d)512 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
513 #endif /* CONFIG_PM */
514
scsi_device_reprobe(struct scsi_device * sdev)515 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
516 {
517 return device_reprobe(&sdev->sdev_gendev);
518 }
519
sdev_channel(struct scsi_device * sdev)520 static inline unsigned int sdev_channel(struct scsi_device *sdev)
521 {
522 return sdev->channel;
523 }
524
sdev_id(struct scsi_device * sdev)525 static inline unsigned int sdev_id(struct scsi_device *sdev)
526 {
527 return sdev->id;
528 }
529
530 #define scmd_id(scmd) sdev_id((scmd)->device)
531 #define scmd_channel(scmd) sdev_channel((scmd)->device)
532
533 /*
534 * checks for positions of the SCSI state machine
535 */
scsi_device_online(struct scsi_device * sdev)536 static inline int scsi_device_online(struct scsi_device *sdev)
537 {
538 return (sdev->sdev_state != SDEV_OFFLINE &&
539 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
540 sdev->sdev_state != SDEV_DEL);
541 }
scsi_device_blocked(struct scsi_device * sdev)542 static inline int scsi_device_blocked(struct scsi_device *sdev)
543 {
544 return sdev->sdev_state == SDEV_BLOCK ||
545 sdev->sdev_state == SDEV_CREATED_BLOCK;
546 }
scsi_device_created(struct scsi_device * sdev)547 static inline int scsi_device_created(struct scsi_device *sdev)
548 {
549 return sdev->sdev_state == SDEV_CREATED ||
550 sdev->sdev_state == SDEV_CREATED_BLOCK;
551 }
552
553 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
554 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
555 enum scsi_device_state new_state);
556
557 /* accessor functions for the SCSI parameters */
scsi_device_sync(struct scsi_device * sdev)558 static inline int scsi_device_sync(struct scsi_device *sdev)
559 {
560 return sdev->sdtr;
561 }
scsi_device_wide(struct scsi_device * sdev)562 static inline int scsi_device_wide(struct scsi_device *sdev)
563 {
564 return sdev->wdtr;
565 }
scsi_device_dt(struct scsi_device * sdev)566 static inline int scsi_device_dt(struct scsi_device *sdev)
567 {
568 return sdev->ppr;
569 }
scsi_device_dt_only(struct scsi_device * sdev)570 static inline int scsi_device_dt_only(struct scsi_device *sdev)
571 {
572 if (sdev->inquiry_len < 57)
573 return 0;
574 return (sdev->inquiry[56] & 0x0c) == 0x04;
575 }
scsi_device_ius(struct scsi_device * sdev)576 static inline int scsi_device_ius(struct scsi_device *sdev)
577 {
578 if (sdev->inquiry_len < 57)
579 return 0;
580 return sdev->inquiry[56] & 0x01;
581 }
scsi_device_qas(struct scsi_device * sdev)582 static inline int scsi_device_qas(struct scsi_device *sdev)
583 {
584 if (sdev->inquiry_len < 57)
585 return 0;
586 return sdev->inquiry[56] & 0x02;
587 }
scsi_device_enclosure(struct scsi_device * sdev)588 static inline int scsi_device_enclosure(struct scsi_device *sdev)
589 {
590 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
591 }
592
scsi_device_protection(struct scsi_device * sdev)593 static inline int scsi_device_protection(struct scsi_device *sdev)
594 {
595 if (sdev->no_dif)
596 return 0;
597
598 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
599 }
600
scsi_device_tpgs(struct scsi_device * sdev)601 static inline int scsi_device_tpgs(struct scsi_device *sdev)
602 {
603 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
604 }
605
606 /**
607 * scsi_device_supports_vpd - test if a device supports VPD pages
608 * @sdev: the &struct scsi_device to test
609 *
610 * If the 'try_vpd_pages' flag is set it takes precedence.
611 * Otherwise we will assume VPD pages are supported if the
612 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
613 */
scsi_device_supports_vpd(struct scsi_device * sdev)614 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
615 {
616 /* Attempt VPD inquiry if the device blacklist explicitly calls
617 * for it.
618 */
619 if (sdev->try_vpd_pages)
620 return 1;
621 /*
622 * Although VPD inquiries can go to SCSI-2 type devices,
623 * some USB ones crash on receiving them, and the pages
624 * we currently ask for are mandatory for SPC-2 and beyond
625 */
626 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
627 return 1;
628 return 0;
629 }
630
scsi_device_busy(struct scsi_device * sdev)631 static inline int scsi_device_busy(struct scsi_device *sdev)
632 {
633 return sbitmap_weight(&sdev->budget_map);
634 }
635
636 #define MODULE_ALIAS_SCSI_DEVICE(type) \
637 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
638 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
639
640 #endif /* _SCSI_SCSI_DEVICE_H */
641
