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