xref: /openbmc/linux/include/scsi/scsi_device.h (revision 76426e23)
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 starved_entry;
114 	unsigned short queue_depth;	/* How deep of a queue we want */
115 	unsigned short max_queue_depth;	/* max queue depth */
116 	unsigned short last_queue_full_depth; /* These two are used by */
117 	unsigned short last_queue_full_count; /* scsi_track_queue_full() */
118 	unsigned long last_queue_full_time;	/* last queue full time */
119 	unsigned long queue_ramp_up_period;	/* ramp up period in jiffies */
120 #define SCSI_DEFAULT_RAMP_UP_PERIOD	(120 * HZ)
121 
122 	unsigned long last_queue_ramp_up;	/* last queue ramp up time */
123 
124 	unsigned int id, channel;
125 	u64 lun;
126 	unsigned int manufacturer;	/* Manufacturer of device, for using
127 					 * vendor-specific cmd's */
128 	unsigned sector_size;	/* size in bytes */
129 
130 	void *hostdata;		/* available to low-level driver */
131 	unsigned char type;
132 	char scsi_level;
133 	char inq_periph_qual;	/* PQ from INQUIRY data */
134 	struct mutex inquiry_mutex;
135 	unsigned char inquiry_len;	/* valid bytes in 'inquiry' */
136 	unsigned char * inquiry;	/* INQUIRY response data */
137 	const char * vendor;		/* [back_compat] point into 'inquiry' ... */
138 	const char * model;		/* ... after scan; point to static string */
139 	const char * rev;		/* ... "nullnullnullnull" before scan */
140 
141 #define SCSI_VPD_PG_LEN                255
142 	struct scsi_vpd __rcu *vpd_pg0;
143 	struct scsi_vpd __rcu *vpd_pg83;
144 	struct scsi_vpd __rcu *vpd_pg80;
145 	struct scsi_vpd __rcu *vpd_pg89;
146 	unsigned char current_tag;	/* current tag */
147 	struct scsi_target      *sdev_target;   /* used only for single_lun */
148 
149 	blist_flags_t		sdev_bflags; /* black/white flags as also found in
150 				 * scsi_devinfo.[hc]. For now used only to
151 				 * pass settings from slave_alloc to scsi
152 				 * core. */
153 	unsigned int eh_timeout; /* Error handling timeout */
154 	unsigned removable:1;
155 	unsigned changed:1;	/* Data invalid due to media change */
156 	unsigned busy:1;	/* Used to prevent races */
157 	unsigned lockable:1;	/* Able to prevent media removal */
158 	unsigned locked:1;      /* Media removal disabled */
159 	unsigned borken:1;	/* Tell the Seagate driver to be
160 				 * painfully slow on this device */
161 	unsigned disconnect:1;	/* can disconnect */
162 	unsigned soft_reset:1;	/* Uses soft reset option */
163 	unsigned sdtr:1;	/* Device supports SDTR messages */
164 	unsigned wdtr:1;	/* Device supports WDTR messages */
165 	unsigned ppr:1;		/* Device supports PPR messages */
166 	unsigned tagged_supported:1;	/* Supports SCSI-II tagged queuing */
167 	unsigned simple_tags:1;	/* simple queue tag messages are enabled */
168 	unsigned was_reset:1;	/* There was a bus reset on the bus for
169 				 * this device */
170 	unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
171 				     * because we did a bus reset. */
172 	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
173 	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
174 	unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
175 	unsigned no_report_opcodes:1;	/* no REPORT SUPPORTED OPERATION CODES */
176 	unsigned no_write_same:1;	/* no WRITE SAME command */
177 	unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
178 	unsigned skip_ms_page_8:1;	/* do not use MODE SENSE page 0x08 */
179 	unsigned skip_ms_page_3f:1;	/* do not use MODE SENSE page 0x3f */
180 	unsigned skip_vpd_pages:1;	/* do not read VPD pages */
181 	unsigned try_vpd_pages:1;	/* attempt to read VPD pages */
182 	unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
183 	unsigned no_start_on_add:1;	/* do not issue start on add */
184 	unsigned allow_restart:1; /* issue START_UNIT in error handler */
185 	unsigned manage_start_stop:1;	/* Let HLD (sd) manage start/stop */
186 	unsigned start_stop_pwr_cond:1;	/* Set power cond. in START_STOP_UNIT */
187 	unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
188 	unsigned select_no_atn:1;
189 	unsigned fix_capacity:1;	/* READ_CAPACITY is too high by 1 */
190 	unsigned guess_capacity:1;	/* READ_CAPACITY might be too high by 1 */
191 	unsigned retry_hwerror:1;	/* Retry HARDWARE_ERROR */
192 	unsigned last_sector_bug:1;	/* do not use multisector accesses on
193 					   SD_LAST_BUGGY_SECTORS */
194 	unsigned no_read_disc_info:1;	/* Avoid READ_DISC_INFO cmds */
195 	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
196 	unsigned try_rc_10_first:1;	/* Try READ_CAPACACITY_10 first */
197 	unsigned security_supported:1;	/* Supports Security Protocols */
198 	unsigned is_visible:1;	/* is the device visible in sysfs */
199 	unsigned wce_default_on:1;	/* Cache is ON by default */
200 	unsigned no_dif:1;	/* T10 PI (DIF) should be disabled */
201 	unsigned broken_fua:1;		/* Don't set FUA bit */
202 	unsigned lun_in_cdb:1;		/* Store LUN bits in CDB[1] */
203 	unsigned unmap_limit_for_ws:1;	/* Use the UNMAP limit for WRITE SAME */
204 	unsigned rpm_autosuspend:1;	/* Enable runtime autosuspend at device
205 					 * creation time */
206 
207 	bool offline_already;		/* Device offline message logged */
208 
209 	atomic_t disk_events_disable_depth; /* disable depth for disk events */
210 
211 	DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
212 	DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
213 	struct list_head event_list;	/* asserted events */
214 	struct work_struct event_work;
215 
216 	unsigned int max_device_blocked; /* what device_blocked counts down from  */
217 #define SCSI_DEFAULT_DEVICE_BLOCKED	3
218 
219 	atomic_t iorequest_cnt;
220 	atomic_t iodone_cnt;
221 	atomic_t ioerr_cnt;
222 
223 	struct device		sdev_gendev,
224 				sdev_dev;
225 
226 	struct execute_work	ew; /* used to get process context on put */
227 	struct work_struct	requeue_work;
228 
229 	struct scsi_device_handler *handler;
230 	void			*handler_data;
231 
232 	unsigned char		access_state;
233 	struct mutex		state_mutex;
234 	enum scsi_device_state sdev_state;
235 	struct task_struct	*quiesced_by;
236 	unsigned long		sdev_data[];
237 } __attribute__((aligned(sizeof(unsigned long))));
238 
239 #define	to_scsi_device(d)	\
240 	container_of(d, struct scsi_device, sdev_gendev)
241 #define	class_to_sdev(d)	\
242 	container_of(d, struct scsi_device, sdev_dev)
243 #define transport_class_to_sdev(class_dev) \
244 	to_scsi_device(class_dev->parent)
245 
246 #define sdev_dbg(sdev, fmt, a...) \
247 	dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
248 
249 /*
250  * like scmd_printk, but the device name is passed in
251  * as a string pointer
252  */
253 __printf(4, 5) void
254 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
255 		const char *, ...);
256 
257 #define sdev_printk(l, sdev, fmt, a...)				\
258 	sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
259 
260 __printf(3, 4) void
261 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
262 
263 #define scmd_dbg(scmd, fmt, a...)					   \
264 	do {								   \
265 		if ((scmd)->request->rq_disk)				   \
266 			sdev_dbg((scmd)->device, "[%s] " fmt,		   \
267 				 (scmd)->request->rq_disk->disk_name, ##a);\
268 		else							   \
269 			sdev_dbg((scmd)->device, fmt, ##a);		   \
270 	} while (0)
271 
272 enum scsi_target_state {
273 	STARGET_CREATED = 1,
274 	STARGET_RUNNING,
275 	STARGET_REMOVE,
276 	STARGET_CREATED_REMOVE,
277 	STARGET_DEL,
278 };
279 
280 /*
281  * scsi_target: representation of a scsi target, for now, this is only
282  * used for single_lun devices. If no one has active IO to the target,
283  * starget_sdev_user is NULL, else it points to the active sdev.
284  */
285 struct scsi_target {
286 	struct scsi_device	*starget_sdev_user;
287 	struct list_head	siblings;
288 	struct list_head	devices;
289 	struct device		dev;
290 	struct kref		reap_ref; /* last put renders target invisible */
291 	unsigned int		channel;
292 	unsigned int		id; /* target id ... replace
293 				     * scsi_device.id eventually */
294 	unsigned int		create:1; /* signal that it needs to be added */
295 	unsigned int		single_lun:1;	/* Indicates we should only
296 						 * allow I/O to one of the luns
297 						 * for the device at a time. */
298 	unsigned int		pdt_1f_for_no_lun:1;	/* PDT = 0x1f
299 						 * means no lun present. */
300 	unsigned int		no_report_luns:1;	/* Don't use
301 						 * REPORT LUNS for scanning. */
302 	unsigned int		expecting_lun_change:1;	/* A device has reported
303 						 * a 3F/0E UA, other devices on
304 						 * the same target will also. */
305 	/* commands actually active on LLD. */
306 	atomic_t		target_busy;
307 	atomic_t		target_blocked;
308 
309 	/*
310 	 * LLDs should set this in the slave_alloc host template callout.
311 	 * If set to zero then there is not limit.
312 	 */
313 	unsigned int		can_queue;
314 	unsigned int		max_target_blocked;
315 #define SCSI_DEFAULT_TARGET_BLOCKED	3
316 
317 	char			scsi_level;
318 	enum scsi_target_state	state;
319 	void 			*hostdata; /* available to low-level driver */
320 	unsigned long		starget_data[]; /* for the transport */
321 	/* starget_data must be the last element!!!! */
322 } __attribute__((aligned(sizeof(unsigned long))));
323 
324 #define to_scsi_target(d)	container_of(d, struct scsi_target, dev)
325 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
326 {
327 	return to_scsi_target(sdev->sdev_gendev.parent);
328 }
329 #define transport_class_to_starget(class_dev) \
330 	to_scsi_target(class_dev->parent)
331 
332 #define starget_printk(prefix, starget, fmt, a...)	\
333 	dev_printk(prefix, &(starget)->dev, fmt, ##a)
334 
335 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
336 		uint, uint, u64, void *hostdata);
337 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
338 			   uint target, u64 lun);
339 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
340 extern void scsi_remove_device(struct scsi_device *);
341 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
342 void scsi_attach_vpd(struct scsi_device *sdev);
343 
344 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
345 extern int __must_check scsi_device_get(struct scsi_device *);
346 extern void scsi_device_put(struct scsi_device *);
347 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
348 					      uint, uint, u64);
349 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
350 						uint, uint, u64);
351 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
352 							u64);
353 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
354 							  u64);
355 extern void starget_for_each_device(struct scsi_target *, void *,
356 		     void (*fn)(struct scsi_device *, void *));
357 extern void __starget_for_each_device(struct scsi_target *, void *,
358 				      void (*fn)(struct scsi_device *,
359 						 void *));
360 
361 /* only exposed to implement shost_for_each_device */
362 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
363 						  struct scsi_device *);
364 
365 /**
366  * shost_for_each_device - iterate over all devices of a host
367  * @sdev: the &struct scsi_device to use as a cursor
368  * @shost: the &struct scsi_host to iterate over
369  *
370  * Iterator that returns each device attached to @shost.  This loop
371  * takes a reference on each device and releases it at the end.  If
372  * you break out of the loop, you must call scsi_device_put(sdev).
373  */
374 #define shost_for_each_device(sdev, shost) \
375 	for ((sdev) = __scsi_iterate_devices((shost), NULL); \
376 	     (sdev); \
377 	     (sdev) = __scsi_iterate_devices((shost), (sdev)))
378 
379 /**
380  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
381  * @sdev: the &struct scsi_device to use as a cursor
382  * @shost: the &struct scsi_host to iterate over
383  *
384  * Iterator that returns each device attached to @shost.  It does _not_
385  * take a reference on the scsi_device, so the whole loop must be
386  * protected by shost->host_lock.
387  *
388  * Note: The only reason to use this is because you need to access the
389  * device list in interrupt context.  Otherwise you really want to use
390  * shost_for_each_device instead.
391  */
392 #define __shost_for_each_device(sdev, shost) \
393 	list_for_each_entry((sdev), &((shost)->__devices), siblings)
394 
395 extern int scsi_change_queue_depth(struct scsi_device *, int);
396 extern int scsi_track_queue_full(struct scsi_device *, int);
397 
398 extern int scsi_set_medium_removal(struct scsi_device *, char);
399 
400 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
401 			   unsigned char *buffer, int len, int timeout,
402 			   int retries, struct scsi_mode_data *data,
403 			   struct scsi_sense_hdr *);
404 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
405 			    int modepage, unsigned char *buffer, int len,
406 			    int timeout, int retries,
407 			    struct scsi_mode_data *data,
408 			    struct scsi_sense_hdr *);
409 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
410 				int retries, struct scsi_sense_hdr *sshdr);
411 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
412 			     int buf_len);
413 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
414 			      unsigned int len, unsigned char opcode);
415 extern int scsi_device_set_state(struct scsi_device *sdev,
416 				 enum scsi_device_state state);
417 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
418 					  gfp_t gfpflags);
419 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
420 extern void sdev_evt_send_simple(struct scsi_device *sdev,
421 			  enum scsi_device_event evt_type, gfp_t gfpflags);
422 extern int scsi_device_quiesce(struct scsi_device *sdev);
423 extern void scsi_device_resume(struct scsi_device *sdev);
424 extern void scsi_target_quiesce(struct scsi_target *);
425 extern void scsi_target_resume(struct scsi_target *);
426 extern void scsi_scan_target(struct device *parent, unsigned int channel,
427 			     unsigned int id, u64 lun,
428 			     enum scsi_scan_mode rescan);
429 extern void scsi_target_reap(struct scsi_target *);
430 extern void scsi_target_block(struct device *);
431 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
432 extern void scsi_remove_target(struct device *);
433 extern const char *scsi_device_state_name(enum scsi_device_state);
434 extern int scsi_is_sdev_device(const struct device *);
435 extern int scsi_is_target_device(const struct device *);
436 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
437 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
438 			int data_direction, void *buffer, unsigned bufflen,
439 			unsigned char *sense, struct scsi_sense_hdr *sshdr,
440 			int timeout, int retries, u64 flags,
441 			req_flags_t rq_flags, int *resid);
442 /* Make sure any sense buffer is the correct size. */
443 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense,	\
444 		     sshdr, timeout, retries, flags, rq_flags, resid)	\
445 ({									\
446 	BUILD_BUG_ON((sense) != NULL &&					\
447 		     sizeof(sense) != SCSI_SENSE_BUFFERSIZE);		\
448 	__scsi_execute(sdev, cmd, data_direction, buffer, bufflen,	\
449 		       sense, sshdr, timeout, retries, flags, rq_flags,	\
450 		       resid);						\
451 })
452 static inline int scsi_execute_req(struct scsi_device *sdev,
453 	const unsigned char *cmd, int data_direction, void *buffer,
454 	unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
455 	int retries, int *resid)
456 {
457 	return scsi_execute(sdev, cmd, data_direction, buffer,
458 		bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
459 }
460 extern void sdev_disable_disk_events(struct scsi_device *sdev);
461 extern void sdev_enable_disk_events(struct scsi_device *sdev);
462 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
463 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
464 
465 #ifdef CONFIG_PM
466 extern int scsi_autopm_get_device(struct scsi_device *);
467 extern void scsi_autopm_put_device(struct scsi_device *);
468 #else
469 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
470 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
471 #endif /* CONFIG_PM */
472 
473 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
474 {
475 	return device_reprobe(&sdev->sdev_gendev);
476 }
477 
478 static inline unsigned int sdev_channel(struct scsi_device *sdev)
479 {
480 	return sdev->channel;
481 }
482 
483 static inline unsigned int sdev_id(struct scsi_device *sdev)
484 {
485 	return sdev->id;
486 }
487 
488 #define scmd_id(scmd) sdev_id((scmd)->device)
489 #define scmd_channel(scmd) sdev_channel((scmd)->device)
490 
491 /*
492  * checks for positions of the SCSI state machine
493  */
494 static inline int scsi_device_online(struct scsi_device *sdev)
495 {
496 	return (sdev->sdev_state != SDEV_OFFLINE &&
497 		sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
498 		sdev->sdev_state != SDEV_DEL);
499 }
500 static inline int scsi_device_blocked(struct scsi_device *sdev)
501 {
502 	return sdev->sdev_state == SDEV_BLOCK ||
503 		sdev->sdev_state == SDEV_CREATED_BLOCK;
504 }
505 static inline int scsi_device_created(struct scsi_device *sdev)
506 {
507 	return sdev->sdev_state == SDEV_CREATED ||
508 		sdev->sdev_state == SDEV_CREATED_BLOCK;
509 }
510 
511 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
512 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
513 					enum scsi_device_state new_state);
514 
515 /* accessor functions for the SCSI parameters */
516 static inline int scsi_device_sync(struct scsi_device *sdev)
517 {
518 	return sdev->sdtr;
519 }
520 static inline int scsi_device_wide(struct scsi_device *sdev)
521 {
522 	return sdev->wdtr;
523 }
524 static inline int scsi_device_dt(struct scsi_device *sdev)
525 {
526 	return sdev->ppr;
527 }
528 static inline int scsi_device_dt_only(struct scsi_device *sdev)
529 {
530 	if (sdev->inquiry_len < 57)
531 		return 0;
532 	return (sdev->inquiry[56] & 0x0c) == 0x04;
533 }
534 static inline int scsi_device_ius(struct scsi_device *sdev)
535 {
536 	if (sdev->inquiry_len < 57)
537 		return 0;
538 	return sdev->inquiry[56] & 0x01;
539 }
540 static inline int scsi_device_qas(struct scsi_device *sdev)
541 {
542 	if (sdev->inquiry_len < 57)
543 		return 0;
544 	return sdev->inquiry[56] & 0x02;
545 }
546 static inline int scsi_device_enclosure(struct scsi_device *sdev)
547 {
548 	return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
549 }
550 
551 static inline int scsi_device_protection(struct scsi_device *sdev)
552 {
553 	if (sdev->no_dif)
554 		return 0;
555 
556 	return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
557 }
558 
559 static inline int scsi_device_tpgs(struct scsi_device *sdev)
560 {
561 	return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
562 }
563 
564 /**
565  * scsi_device_supports_vpd - test if a device supports VPD pages
566  * @sdev: the &struct scsi_device to test
567  *
568  * If the 'try_vpd_pages' flag is set it takes precedence.
569  * Otherwise we will assume VPD pages are supported if the
570  * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
571  */
572 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
573 {
574 	/* Attempt VPD inquiry if the device blacklist explicitly calls
575 	 * for it.
576 	 */
577 	if (sdev->try_vpd_pages)
578 		return 1;
579 	/*
580 	 * Although VPD inquiries can go to SCSI-2 type devices,
581 	 * some USB ones crash on receiving them, and the pages
582 	 * we currently ask for are mandatory for SPC-2 and beyond
583 	 */
584 	if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
585 		return 1;
586 	return 0;
587 }
588 
589 #define MODULE_ALIAS_SCSI_DEVICE(type) \
590 	MODULE_ALIAS("scsi:t-" __stringify(type) "*")
591 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
592 
593 #endif /* _SCSI_SCSI_DEVICE_H */
594