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 ; |
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 | = 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 start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ |
217 | unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ |
218 | unsigned select_no_atn:1; |
219 | unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ |
220 | unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ |
221 | unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ |
222 | unsigned last_sector_bug:1; /* do not use multisector accesses on |
223 | SD_LAST_BUGGY_SECTORS */ |
224 | unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ |
225 | unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ |
226 | unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ |
227 | unsigned security_supported:1; /* Supports Security Protocols */ |
228 | unsigned is_visible:1; /* is the device visible in sysfs */ |
229 | unsigned wce_default_on:1; /* Cache is ON by default */ |
230 | unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ |
231 | unsigned broken_fua:1; /* Don't set FUA bit */ |
232 | unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ |
233 | unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ |
234 | unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device |
235 | * creation time */ |
236 | unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ |
237 | unsigned silence_suspend:1; /* Do not print runtime PM related messages */ |
238 | unsigned no_vpd_size:1; /* No VPD size reported in header */ |
239 | |
240 | unsigned cdl_supported:1; /* Command duration limits supported */ |
241 | unsigned cdl_enable:1; /* Enable/disable Command duration limits */ |
242 | |
243 | unsigned int queue_stopped; /* request queue is quiesced */ |
244 | bool offline_already; /* Device offline message logged */ |
245 | |
246 | atomic_t disk_events_disable_depth; /* disable depth for disk events */ |
247 | |
248 | DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ |
249 | DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ |
250 | struct list_head event_list; /* asserted events */ |
251 | struct work_struct event_work; |
252 | |
253 | unsigned int max_device_blocked; /* what device_blocked counts down from */ |
254 | #define SCSI_DEFAULT_DEVICE_BLOCKED 3 |
255 | |
256 | atomic_t iorequest_cnt; |
257 | atomic_t iodone_cnt; |
258 | atomic_t ioerr_cnt; |
259 | atomic_t iotmo_cnt; |
260 | |
261 | struct device sdev_gendev, |
262 | sdev_dev; |
263 | |
264 | struct work_struct requeue_work; |
265 | |
266 | struct scsi_device_handler *handler; |
267 | void *handler_data; |
268 | |
269 | size_t dma_drain_len; |
270 | void *dma_drain_buf; |
271 | |
272 | unsigned int sg_timeout; |
273 | unsigned int sg_reserved_size; |
274 | |
275 | struct bsg_device *bsg_dev; |
276 | unsigned char access_state; |
277 | struct mutex state_mutex; |
278 | enum scsi_device_state sdev_state; |
279 | struct task_struct *quiesced_by; |
280 | unsigned long sdev_data[]; |
281 | } __attribute__((aligned(sizeof(unsigned long)))); |
282 | |
283 | #define to_scsi_device(d) \ |
284 | container_of(d, struct scsi_device, sdev_gendev) |
285 | #define class_to_sdev(d) \ |
286 | container_of(d, struct scsi_device, sdev_dev) |
287 | #define transport_class_to_sdev(class_dev) \ |
288 | to_scsi_device(class_dev->parent) |
289 | |
290 | #define sdev_dbg(sdev, fmt, a...) \ |
291 | dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) |
292 | |
293 | /* |
294 | * like scmd_printk, but the device name is passed in |
295 | * as a string pointer |
296 | */ |
297 | __printf(4, 5) void |
298 | sdev_prefix_printk(const char *, const struct scsi_device *, const char *, |
299 | const char *, ...); |
300 | |
301 | #define sdev_printk(l, sdev, fmt, a...) \ |
302 | sdev_prefix_printk(l, sdev, NULL, fmt, ##a) |
303 | |
304 | __printf(3, 4) void |
305 | scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); |
306 | |
307 | #define scmd_dbg(scmd, fmt, a...) \ |
308 | do { \ |
309 | struct request *__rq = scsi_cmd_to_rq((scmd)); \ |
310 | \ |
311 | if (__rq->q->disk) \ |
312 | sdev_dbg((scmd)->device, "[%s] " fmt, \ |
313 | __rq->q->disk->disk_name, ##a); \ |
314 | else \ |
315 | sdev_dbg((scmd)->device, fmt, ##a); \ |
316 | } while (0) |
317 | |
318 | enum scsi_target_state { |
319 | STARGET_CREATED = 1, |
320 | STARGET_RUNNING, |
321 | STARGET_REMOVE, |
322 | STARGET_CREATED_REMOVE, |
323 | STARGET_DEL, |
324 | }; |
325 | |
326 | /* |
327 | * scsi_target: representation of a scsi target, for now, this is only |
328 | * used for single_lun devices. If no one has active IO to the target, |
329 | * starget_sdev_user is NULL, else it points to the active sdev. |
330 | */ |
331 | struct scsi_target { |
332 | struct scsi_device *starget_sdev_user; |
333 | struct list_head siblings; |
334 | struct list_head devices; |
335 | struct device dev; |
336 | struct kref reap_ref; /* last put renders target invisible */ |
337 | unsigned int channel; |
338 | unsigned int id; /* target id ... replace |
339 | * scsi_device.id eventually */ |
340 | unsigned int create:1; /* signal that it needs to be added */ |
341 | unsigned int single_lun:1; /* Indicates we should only |
342 | * allow I/O to one of the luns |
343 | * for the device at a time. */ |
344 | unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f |
345 | * means no lun present. */ |
346 | unsigned int no_report_luns:1; /* Don't use |
347 | * REPORT LUNS for scanning. */ |
348 | unsigned int expecting_lun_change:1; /* A device has reported |
349 | * a 3F/0E UA, other devices on |
350 | * the same target will also. */ |
351 | /* commands actually active on LLD. */ |
352 | atomic_t target_busy; |
353 | atomic_t target_blocked; |
354 | |
355 | /* |
356 | * LLDs should set this in the slave_alloc host template callout. |
357 | * If set to zero then there is not limit. |
358 | */ |
359 | unsigned int can_queue; |
360 | unsigned int max_target_blocked; |
361 | #define SCSI_DEFAULT_TARGET_BLOCKED 3 |
362 | |
363 | char scsi_level; |
364 | enum scsi_target_state state; |
365 | void *hostdata; /* available to low-level driver */ |
366 | unsigned long starget_data[]; /* for the transport */ |
367 | /* starget_data must be the last element!!!! */ |
368 | } __attribute__((aligned(sizeof(unsigned long)))); |
369 | |
370 | #define to_scsi_target(d) container_of(d, struct scsi_target, dev) |
371 | static inline struct scsi_target *scsi_target(struct scsi_device *sdev) |
372 | { |
373 | return to_scsi_target(sdev->sdev_gendev.parent); |
374 | } |
375 | #define transport_class_to_starget(class_dev) \ |
376 | to_scsi_target(class_dev->parent) |
377 | |
378 | #define starget_printk(prefix, starget, fmt, a...) \ |
379 | dev_printk(prefix, &(starget)->dev, fmt, ##a) |
380 | |
381 | extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, |
382 | uint, uint, u64, void *hostdata); |
383 | extern int scsi_add_device(struct Scsi_Host *host, uint channel, |
384 | uint target, u64 lun); |
385 | extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); |
386 | extern void scsi_remove_device(struct scsi_device *); |
387 | extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); |
388 | void scsi_attach_vpd(struct scsi_device *sdev); |
389 | void scsi_cdl_check(struct scsi_device *sdev); |
390 | int scsi_cdl_enable(struct scsi_device *sdev, bool enable); |
391 | |
392 | extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); |
393 | extern int __must_check scsi_device_get(struct scsi_device *); |
394 | extern void scsi_device_put(struct scsi_device *); |
395 | extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, |
396 | uint, uint, u64); |
397 | extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, |
398 | uint, uint, u64); |
399 | extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, |
400 | u64); |
401 | extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, |
402 | u64); |
403 | extern void starget_for_each_device(struct scsi_target *, void *, |
404 | void (*fn)(struct scsi_device *, void *)); |
405 | extern void __starget_for_each_device(struct scsi_target *, void *, |
406 | void (*fn)(struct scsi_device *, |
407 | void *)); |
408 | |
409 | /* only exposed to implement shost_for_each_device */ |
410 | extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, |
411 | struct scsi_device *); |
412 | |
413 | /** |
414 | * shost_for_each_device - iterate over all devices of a host |
415 | * @sdev: the &struct scsi_device to use as a cursor |
416 | * @shost: the &struct scsi_host to iterate over |
417 | * |
418 | * Iterator that returns each device attached to @shost. This loop |
419 | * takes a reference on each device and releases it at the end. If |
420 | * you break out of the loop, you must call scsi_device_put(sdev). |
421 | */ |
422 | #define shost_for_each_device(sdev, shost) \ |
423 | for ((sdev) = __scsi_iterate_devices((shost), NULL); \ |
424 | (sdev); \ |
425 | (sdev) = __scsi_iterate_devices((shost), (sdev))) |
426 | |
427 | /** |
428 | * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) |
429 | * @sdev: the &struct scsi_device to use as a cursor |
430 | * @shost: the &struct scsi_host to iterate over |
431 | * |
432 | * Iterator that returns each device attached to @shost. It does _not_ |
433 | * take a reference on the scsi_device, so the whole loop must be |
434 | * protected by shost->host_lock. |
435 | * |
436 | * Note: The only reason to use this is because you need to access the |
437 | * device list in interrupt context. Otherwise you really want to use |
438 | * shost_for_each_device instead. |
439 | */ |
440 | #define __shost_for_each_device(sdev, shost) \ |
441 | list_for_each_entry((sdev), &((shost)->__devices), siblings) |
442 | |
443 | extern int scsi_change_queue_depth(struct scsi_device *, int); |
444 | extern int scsi_track_queue_full(struct scsi_device *, int); |
445 | |
446 | extern int scsi_set_medium_removal(struct scsi_device *, char); |
447 | |
448 | int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, |
449 | int subpage, unsigned char *buffer, int len, int timeout, |
450 | int retries, struct scsi_mode_data *data, |
451 | struct scsi_sense_hdr *); |
452 | extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, |
453 | unsigned char *buffer, int len, int timeout, |
454 | int retries, struct scsi_mode_data *data, |
455 | struct scsi_sense_hdr *); |
456 | extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, |
457 | int retries, struct scsi_sense_hdr *sshdr); |
458 | extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, |
459 | int buf_len); |
460 | int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, |
461 | unsigned int len, unsigned char opcode, |
462 | unsigned short sa); |
463 | extern int scsi_device_set_state(struct scsi_device *sdev, |
464 | enum scsi_device_state state); |
465 | extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, |
466 | gfp_t gfpflags); |
467 | extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); |
468 | extern void sdev_evt_send_simple(struct scsi_device *sdev, |
469 | enum scsi_device_event evt_type, gfp_t gfpflags); |
470 | extern int scsi_device_quiesce(struct scsi_device *sdev); |
471 | extern void scsi_device_resume(struct scsi_device *sdev); |
472 | extern void scsi_target_quiesce(struct scsi_target *); |
473 | extern void scsi_target_resume(struct scsi_target *); |
474 | extern void scsi_scan_target(struct device *parent, unsigned int channel, |
475 | unsigned int id, u64 lun, |
476 | enum scsi_scan_mode rescan); |
477 | extern void scsi_target_reap(struct scsi_target *); |
478 | void scsi_block_targets(struct Scsi_Host *shost, struct device *dev); |
479 | extern void scsi_target_unblock(struct device *, enum scsi_device_state); |
480 | extern void scsi_remove_target(struct device *); |
481 | extern const char *scsi_device_state_name(enum scsi_device_state); |
482 | extern int scsi_is_sdev_device(const struct device *); |
483 | extern int scsi_is_target_device(const struct device *); |
484 | extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); |
485 | |
486 | /* Optional arguments to scsi_execute_cmd */ |
487 | struct scsi_exec_args { |
488 | unsigned char *sense; /* sense buffer */ |
489 | unsigned int sense_len; /* sense buffer len */ |
490 | struct scsi_sense_hdr *sshdr; /* decoded sense header */ |
491 | blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */ |
492 | int scmd_flags; /* SCMD flags */ |
493 | int *resid; /* residual length */ |
494 | }; |
495 | |
496 | int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd, |
497 | blk_opf_t opf, void *buffer, unsigned int bufflen, |
498 | int timeout, int retries, |
499 | const struct scsi_exec_args *args); |
500 | |
501 | extern void sdev_disable_disk_events(struct scsi_device *sdev); |
502 | extern void sdev_enable_disk_events(struct scsi_device *sdev); |
503 | extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); |
504 | extern int scsi_vpd_tpg_id(struct scsi_device *, int *); |
505 | |
506 | #ifdef CONFIG_PM |
507 | extern int scsi_autopm_get_device(struct scsi_device *); |
508 | extern void scsi_autopm_put_device(struct scsi_device *); |
509 | #else |
510 | static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } |
511 | static inline void scsi_autopm_put_device(struct scsi_device *d) {} |
512 | #endif /* CONFIG_PM */ |
513 | |
514 | static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) |
515 | { |
516 | return device_reprobe(dev: &sdev->sdev_gendev); |
517 | } |
518 | |
519 | static inline unsigned int sdev_channel(struct scsi_device *sdev) |
520 | { |
521 | return sdev->channel; |
522 | } |
523 | |
524 | static inline unsigned int sdev_id(struct scsi_device *sdev) |
525 | { |
526 | return sdev->id; |
527 | } |
528 | |
529 | #define scmd_id(scmd) sdev_id((scmd)->device) |
530 | #define scmd_channel(scmd) sdev_channel((scmd)->device) |
531 | |
532 | /* |
533 | * checks for positions of the SCSI state machine |
534 | */ |
535 | static inline int scsi_device_online(struct scsi_device *sdev) |
536 | { |
537 | return (sdev->sdev_state != SDEV_OFFLINE && |
538 | sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && |
539 | sdev->sdev_state != SDEV_DEL); |
540 | } |
541 | static inline int scsi_device_blocked(struct scsi_device *sdev) |
542 | { |
543 | return sdev->sdev_state == SDEV_BLOCK || |
544 | sdev->sdev_state == SDEV_CREATED_BLOCK; |
545 | } |
546 | static inline int scsi_device_created(struct scsi_device *sdev) |
547 | { |
548 | return sdev->sdev_state == SDEV_CREATED || |
549 | sdev->sdev_state == SDEV_CREATED_BLOCK; |
550 | } |
551 | |
552 | int scsi_internal_device_block_nowait(struct scsi_device *sdev); |
553 | int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, |
554 | enum scsi_device_state new_state); |
555 | |
556 | /* accessor functions for the SCSI parameters */ |
557 | static inline int scsi_device_sync(struct scsi_device *sdev) |
558 | { |
559 | return sdev->sdtr; |
560 | } |
561 | static inline int scsi_device_wide(struct scsi_device *sdev) |
562 | { |
563 | return sdev->wdtr; |
564 | } |
565 | static inline int scsi_device_dt(struct scsi_device *sdev) |
566 | { |
567 | return sdev->ppr; |
568 | } |
569 | static inline int scsi_device_dt_only(struct scsi_device *sdev) |
570 | { |
571 | if (sdev->inquiry_len < 57) |
572 | return 0; |
573 | return (sdev->inquiry[56] & 0x0c) == 0x04; |
574 | } |
575 | static inline int scsi_device_ius(struct scsi_device *sdev) |
576 | { |
577 | if (sdev->inquiry_len < 57) |
578 | return 0; |
579 | return sdev->inquiry[56] & 0x01; |
580 | } |
581 | static inline int scsi_device_qas(struct scsi_device *sdev) |
582 | { |
583 | if (sdev->inquiry_len < 57) |
584 | return 0; |
585 | return sdev->inquiry[56] & 0x02; |
586 | } |
587 | static inline int scsi_device_enclosure(struct scsi_device *sdev) |
588 | { |
589 | return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; |
590 | } |
591 | |
592 | static inline int scsi_device_protection(struct scsi_device *sdev) |
593 | { |
594 | if (sdev->no_dif) |
595 | return 0; |
596 | |
597 | return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); |
598 | } |
599 | |
600 | static inline int scsi_device_tpgs(struct scsi_device *sdev) |
601 | { |
602 | return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; |
603 | } |
604 | |
605 | /** |
606 | * scsi_device_supports_vpd - test if a device supports VPD pages |
607 | * @sdev: the &struct scsi_device to test |
608 | * |
609 | * If the 'try_vpd_pages' flag is set it takes precedence. |
610 | * Otherwise we will assume VPD pages are supported if the |
611 | * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. |
612 | */ |
613 | static inline int scsi_device_supports_vpd(struct scsi_device *sdev) |
614 | { |
615 | /* Attempt VPD inquiry if the device blacklist explicitly calls |
616 | * for it. |
617 | */ |
618 | if (sdev->try_vpd_pages) |
619 | return 1; |
620 | /* |
621 | * Although VPD inquiries can go to SCSI-2 type devices, |
622 | * some USB ones crash on receiving them, and the pages |
623 | * we currently ask for are mandatory for SPC-2 and beyond |
624 | */ |
625 | if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) |
626 | return 1; |
627 | return 0; |
628 | } |
629 | |
630 | static inline int scsi_device_busy(struct scsi_device *sdev) |
631 | { |
632 | return sbitmap_weight(sb: &sdev->budget_map); |
633 | } |
634 | |
635 | #define MODULE_ALIAS_SCSI_DEVICE(type) \ |
636 | MODULE_ALIAS("scsi:t-" __stringify(type) "*") |
637 | #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" |
638 | |
639 | #endif /* _SCSI_SCSI_DEVICE_H */ |
640 | |