xref: /openbmc/linux/include/scsi/scsi_device.h (revision 6774def6)
1 #ifndef _SCSI_SCSI_DEVICE_H
2 #define _SCSI_SCSI_DEVICE_H
3 
4 #include <linux/list.h>
5 #include <linux/spinlock.h>
6 #include <linux/workqueue.h>
7 #include <linux/blkdev.h>
8 #include <scsi/scsi.h>
9 #include <linux/atomic.h>
10 
11 struct device;
12 struct request_queue;
13 struct scsi_cmnd;
14 struct scsi_lun;
15 struct scsi_sense_hdr;
16 
17 struct scsi_mode_data {
18 	__u32	length;
19 	__u16	block_descriptor_length;
20 	__u8	medium_type;
21 	__u8	device_specific;
22 	__u8	header_length;
23 	__u8	longlba:1;
24 };
25 
26 /*
27  * sdev state: If you alter this, you also need to alter scsi_sysfs.c
28  * (for the ascii descriptions) and the state model enforcer:
29  * scsi_lib:scsi_device_set_state().
30  */
31 enum scsi_device_state {
32 	SDEV_CREATED = 1,	/* device created but not added to sysfs
33 				 * Only internal commands allowed (for inq) */
34 	SDEV_RUNNING,		/* device properly configured
35 				 * All commands allowed */
36 	SDEV_CANCEL,		/* beginning to delete device
37 				 * Only error handler commands allowed */
38 	SDEV_DEL,		/* device deleted
39 				 * no commands allowed */
40 	SDEV_QUIESCE,		/* Device quiescent.  No block commands
41 				 * will be accepted, only specials (which
42 				 * originate in the mid-layer) */
43 	SDEV_OFFLINE,		/* Device offlined (by error handling or
44 				 * user request */
45 	SDEV_TRANSPORT_OFFLINE,	/* Offlined by transport class error handler */
46 	SDEV_BLOCK,		/* Device blocked by scsi lld.  No
47 				 * scsi commands from user or midlayer
48 				 * should be issued to the scsi
49 				 * lld. */
50 	SDEV_CREATED_BLOCK,	/* same as above but for created devices */
51 };
52 
53 enum scsi_device_event {
54 	SDEV_EVT_MEDIA_CHANGE	= 1,	/* media has changed */
55 	SDEV_EVT_INQUIRY_CHANGE_REPORTED,		/* 3F 03  UA reported */
56 	SDEV_EVT_CAPACITY_CHANGE_REPORTED,		/* 2A 09  UA reported */
57 	SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,	/* 38 07  UA reported */
58 	SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,	/* 2A 01  UA reported */
59 	SDEV_EVT_LUN_CHANGE_REPORTED,			/* 3F 0E  UA reported */
60 
61 	SDEV_EVT_FIRST		= SDEV_EVT_MEDIA_CHANGE,
62 	SDEV_EVT_LAST		= SDEV_EVT_LUN_CHANGE_REPORTED,
63 
64 	SDEV_EVT_MAXBITS	= SDEV_EVT_LAST + 1
65 };
66 
67 struct scsi_event {
68 	enum scsi_device_event	evt_type;
69 	struct list_head	node;
70 
71 	/* put union of data structures, for non-simple event types,
72 	 * here
73 	 */
74 };
75 
76 struct scsi_device {
77 	struct Scsi_Host *host;
78 	struct request_queue *request_queue;
79 
80 	/* the next two are protected by the host->host_lock */
81 	struct list_head    siblings;   /* list of all devices on this host */
82 	struct list_head    same_target_siblings; /* just the devices sharing same target id */
83 
84 	atomic_t device_busy;		/* commands actually active on LLDD */
85 	atomic_t device_blocked;	/* Device returned QUEUE_FULL. */
86 
87 	spinlock_t list_lock;
88 	struct list_head cmd_list;	/* queue of in use SCSI Command structures */
89 	struct list_head starved_entry;
90 	struct scsi_cmnd *current_cmnd;	/* currently active command */
91 	unsigned short queue_depth;	/* How deep of a queue we want */
92 	unsigned short max_queue_depth;	/* max queue depth */
93 	unsigned short last_queue_full_depth; /* These two are used by */
94 	unsigned short last_queue_full_count; /* scsi_track_queue_full() */
95 	unsigned long last_queue_full_time;	/* last queue full time */
96 	unsigned long queue_ramp_up_period;	/* ramp up period in jiffies */
97 #define SCSI_DEFAULT_RAMP_UP_PERIOD	(120 * HZ)
98 
99 	unsigned long last_queue_ramp_up;	/* last queue ramp up time */
100 
101 	unsigned int id, channel;
102 	u64 lun;
103 	unsigned int manufacturer;	/* Manufacturer of device, for using
104 					 * vendor-specific cmd's */
105 	unsigned sector_size;	/* size in bytes */
106 
107 	void *hostdata;		/* available to low-level driver */
108 	char type;
109 	char scsi_level;
110 	char inq_periph_qual;	/* PQ from INQUIRY data */
111 	unsigned char inquiry_len;	/* valid bytes in 'inquiry' */
112 	unsigned char * inquiry;	/* INQUIRY response data */
113 	const char * vendor;		/* [back_compat] point into 'inquiry' ... */
114 	const char * model;		/* ... after scan; point to static string */
115 	const char * rev;		/* ... "nullnullnullnull" before scan */
116 
117 #define SCSI_VPD_PG_LEN                255
118 	int vpd_pg83_len;
119 	unsigned char *vpd_pg83;
120 	int vpd_pg80_len;
121 	unsigned char *vpd_pg80;
122 	unsigned char current_tag;	/* current tag */
123 	struct scsi_target      *sdev_target;   /* used only for single_lun */
124 
125 	unsigned int	sdev_bflags; /* black/white flags as also found in
126 				 * scsi_devinfo.[hc]. For now used only to
127 				 * pass settings from slave_alloc to scsi
128 				 * core. */
129 	unsigned int eh_timeout; /* Error handling timeout */
130 	unsigned removable:1;
131 	unsigned changed:1;	/* Data invalid due to media change */
132 	unsigned busy:1;	/* Used to prevent races */
133 	unsigned lockable:1;	/* Able to prevent media removal */
134 	unsigned locked:1;      /* Media removal disabled */
135 	unsigned borken:1;	/* Tell the Seagate driver to be
136 				 * painfully slow on this device */
137 	unsigned disconnect:1;	/* can disconnect */
138 	unsigned soft_reset:1;	/* Uses soft reset option */
139 	unsigned sdtr:1;	/* Device supports SDTR messages */
140 	unsigned wdtr:1;	/* Device supports WDTR messages */
141 	unsigned ppr:1;		/* Device supports PPR messages */
142 	unsigned tagged_supported:1;	/* Supports SCSI-II tagged queuing */
143 	unsigned simple_tags:1;	/* simple queue tag messages are enabled */
144 	unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
145 	unsigned was_reset:1;	/* There was a bus reset on the bus for
146 				 * this device */
147 	unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
148 				     * because we did a bus reset. */
149 	unsigned use_10_for_rw:1; /* first try 10-byte read / write */
150 	unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
151 	unsigned no_report_opcodes:1;	/* no REPORT SUPPORTED OPERATION CODES */
152 	unsigned no_write_same:1;	/* no WRITE SAME command */
153 	unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
154 	unsigned skip_ms_page_8:1;	/* do not use MODE SENSE page 0x08 */
155 	unsigned skip_ms_page_3f:1;	/* do not use MODE SENSE page 0x3f */
156 	unsigned skip_vpd_pages:1;	/* do not read VPD pages */
157 	unsigned try_vpd_pages:1;	/* attempt to read VPD pages */
158 	unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
159 	unsigned no_start_on_add:1;	/* do not issue start on add */
160 	unsigned allow_restart:1; /* issue START_UNIT in error handler */
161 	unsigned manage_start_stop:1;	/* Let HLD (sd) manage start/stop */
162 	unsigned start_stop_pwr_cond:1;	/* Set power cond. in START_STOP_UNIT */
163 	unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
164 	unsigned select_no_atn:1;
165 	unsigned fix_capacity:1;	/* READ_CAPACITY is too high by 1 */
166 	unsigned guess_capacity:1;	/* READ_CAPACITY might be too high by 1 */
167 	unsigned retry_hwerror:1;	/* Retry HARDWARE_ERROR */
168 	unsigned last_sector_bug:1;	/* do not use multisector accesses on
169 					   SD_LAST_BUGGY_SECTORS */
170 	unsigned no_read_disc_info:1;	/* Avoid READ_DISC_INFO cmds */
171 	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
172 	unsigned try_rc_10_first:1;	/* Try READ_CAPACACITY_10 first */
173 	unsigned is_visible:1;	/* is the device visible in sysfs */
174 	unsigned wce_default_on:1;	/* Cache is ON by default */
175 	unsigned no_dif:1;	/* T10 PI (DIF) should be disabled */
176 	unsigned broken_fua:1;		/* Don't set FUA bit */
177 	unsigned lun_in_cdb:1;		/* Store LUN bits in CDB[1] */
178 
179 	atomic_t disk_events_disable_depth; /* disable depth for disk events */
180 
181 	DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
182 	DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
183 	struct list_head event_list;	/* asserted events */
184 	struct work_struct event_work;
185 
186 	unsigned int max_device_blocked; /* what device_blocked counts down from  */
187 #define SCSI_DEFAULT_DEVICE_BLOCKED	3
188 
189 	atomic_t iorequest_cnt;
190 	atomic_t iodone_cnt;
191 	atomic_t ioerr_cnt;
192 
193 	struct device		sdev_gendev,
194 				sdev_dev;
195 
196 	struct execute_work	ew; /* used to get process context on put */
197 	struct work_struct	requeue_work;
198 
199 	struct scsi_dh_data	*scsi_dh_data;
200 	enum scsi_device_state sdev_state;
201 	unsigned long		sdev_data[0];
202 } __attribute__((aligned(sizeof(unsigned long))));
203 
204 struct scsi_dh_devlist {
205 	char *vendor;
206 	char *model;
207 };
208 
209 typedef void (*activate_complete)(void *, int);
210 struct scsi_device_handler {
211 	/* Used by the infrastructure */
212 	struct list_head list; /* list of scsi_device_handlers */
213 
214 	/* Filled by the hardware handler */
215 	struct module *module;
216 	const char *name;
217 	const struct scsi_dh_devlist *devlist;
218 	int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
219 	int (*attach)(struct scsi_device *);
220 	void (*detach)(struct scsi_device *);
221 	int (*activate)(struct scsi_device *, activate_complete, void *);
222 	int (*prep_fn)(struct scsi_device *, struct request *);
223 	int (*set_params)(struct scsi_device *, const char *);
224 	bool (*match)(struct scsi_device *);
225 };
226 
227 struct scsi_dh_data {
228 	struct scsi_device_handler *scsi_dh;
229 	struct scsi_device *sdev;
230 	struct kref kref;
231 	char buf[0];
232 };
233 
234 #define	to_scsi_device(d)	\
235 	container_of(d, struct scsi_device, sdev_gendev)
236 #define	class_to_sdev(d)	\
237 	container_of(d, struct scsi_device, sdev_dev)
238 #define transport_class_to_sdev(class_dev) \
239 	to_scsi_device(class_dev->parent)
240 
241 #define sdev_printk(prefix, sdev, fmt, a...)	\
242 	dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
243 
244 #define sdev_dbg(sdev, fmt, a...) \
245 	dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
246 
247 #define scmd_printk(prefix, scmd, fmt, a...)				\
248         (scmd)->request->rq_disk ?					\
249 	sdev_printk(prefix, (scmd)->device, "[%s] " fmt,		\
250 		    (scmd)->request->rq_disk->disk_name, ##a) :		\
251 	sdev_printk(prefix, (scmd)->device, fmt, ##a)
252 
253 #define scmd_dbg(scmd, fmt, a...)					   \
254 	do {								   \
255 		if ((scmd)->request->rq_disk)				   \
256 			sdev_dbg((scmd)->device, "[%s] " fmt,		   \
257 				 (scmd)->request->rq_disk->disk_name, ##a);\
258 		else							   \
259 			sdev_dbg((scmd)->device, fmt, ##a);		   \
260 	} while (0)
261 
262 enum scsi_target_state {
263 	STARGET_CREATED = 1,
264 	STARGET_RUNNING,
265 	STARGET_DEL,
266 };
267 
268 /*
269  * scsi_target: representation of a scsi target, for now, this is only
270  * used for single_lun devices. If no one has active IO to the target,
271  * starget_sdev_user is NULL, else it points to the active sdev.
272  */
273 struct scsi_target {
274 	struct scsi_device	*starget_sdev_user;
275 	struct list_head	siblings;
276 	struct list_head	devices;
277 	struct device		dev;
278 	struct kref		reap_ref; /* last put renders target invisible */
279 	unsigned int		channel;
280 	unsigned int		id; /* target id ... replace
281 				     * scsi_device.id eventually */
282 	unsigned int		create:1; /* signal that it needs to be added */
283 	unsigned int		single_lun:1;	/* Indicates we should only
284 						 * allow I/O to one of the luns
285 						 * for the device at a time. */
286 	unsigned int		pdt_1f_for_no_lun:1;	/* PDT = 0x1f
287 						 * means no lun present. */
288 	unsigned int		no_report_luns:1;	/* Don't use
289 						 * REPORT LUNS for scanning. */
290 	unsigned int		expecting_lun_change:1;	/* A device has reported
291 						 * a 3F/0E UA, other devices on
292 						 * the same target will also. */
293 	/* commands actually active on LLD. */
294 	atomic_t		target_busy;
295 	atomic_t		target_blocked;
296 
297 	/*
298 	 * LLDs should set this in the slave_alloc host template callout.
299 	 * If set to zero then there is not limit.
300 	 */
301 	unsigned int		can_queue;
302 	unsigned int		max_target_blocked;
303 #define SCSI_DEFAULT_TARGET_BLOCKED	3
304 
305 	char			scsi_level;
306 	enum scsi_target_state	state;
307 	void 			*hostdata; /* available to low-level driver */
308 	unsigned long		starget_data[0]; /* for the transport */
309 	/* starget_data must be the last element!!!! */
310 } __attribute__((aligned(sizeof(unsigned long))));
311 
312 #define to_scsi_target(d)	container_of(d, struct scsi_target, dev)
313 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
314 {
315 	return to_scsi_target(sdev->sdev_gendev.parent);
316 }
317 #define transport_class_to_starget(class_dev) \
318 	to_scsi_target(class_dev->parent)
319 
320 #define starget_printk(prefix, starget, fmt, a...)	\
321 	dev_printk(prefix, &(starget)->dev, fmt, ##a)
322 
323 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
324 		uint, uint, u64, void *hostdata);
325 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
326 			   uint target, u64 lun);
327 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
328 extern void scsi_remove_device(struct scsi_device *);
329 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
330 void scsi_attach_vpd(struct scsi_device *sdev);
331 
332 extern int scsi_device_get(struct scsi_device *);
333 extern void scsi_device_put(struct scsi_device *);
334 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
335 					      uint, uint, u64);
336 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
337 						uint, uint, u64);
338 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
339 							u64);
340 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
341 							  u64);
342 extern void starget_for_each_device(struct scsi_target *, void *,
343 		     void (*fn)(struct scsi_device *, void *));
344 extern void __starget_for_each_device(struct scsi_target *, void *,
345 				      void (*fn)(struct scsi_device *,
346 						 void *));
347 
348 /* only exposed to implement shost_for_each_device */
349 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
350 						  struct scsi_device *);
351 
352 /**
353  * shost_for_each_device - iterate over all devices of a host
354  * @sdev: the &struct scsi_device to use as a cursor
355  * @shost: the &struct scsi_host to iterate over
356  *
357  * Iterator that returns each device attached to @shost.  This loop
358  * takes a reference on each device and releases it at the end.  If
359  * you break out of the loop, you must call scsi_device_put(sdev).
360  */
361 #define shost_for_each_device(sdev, shost) \
362 	for ((sdev) = __scsi_iterate_devices((shost), NULL); \
363 	     (sdev); \
364 	     (sdev) = __scsi_iterate_devices((shost), (sdev)))
365 
366 /**
367  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
368  * @sdev: the &struct scsi_device to use as a cursor
369  * @shost: the &struct scsi_host to iterate over
370  *
371  * Iterator that returns each device attached to @shost.  It does _not_
372  * take a reference on the scsi_device, so the whole loop must be
373  * protected by shost->host_lock.
374  *
375  * Note: The only reason to use this is because you need to access the
376  * device list in interrupt context.  Otherwise you really want to use
377  * shost_for_each_device instead.
378  */
379 #define __shost_for_each_device(sdev, shost) \
380 	list_for_each_entry((sdev), &((shost)->__devices), siblings)
381 
382 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
383 extern int scsi_track_queue_full(struct scsi_device *, int);
384 
385 extern int scsi_set_medium_removal(struct scsi_device *, char);
386 
387 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
388 			   unsigned char *buffer, int len, int timeout,
389 			   int retries, struct scsi_mode_data *data,
390 			   struct scsi_sense_hdr *);
391 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
392 			    int modepage, unsigned char *buffer, int len,
393 			    int timeout, int retries,
394 			    struct scsi_mode_data *data,
395 			    struct scsi_sense_hdr *);
396 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
397 				int retries, struct scsi_sense_hdr *sshdr);
398 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
399 			     int buf_len);
400 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
401 			      unsigned int len, unsigned char opcode);
402 extern int scsi_device_set_state(struct scsi_device *sdev,
403 				 enum scsi_device_state state);
404 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
405 					  gfp_t gfpflags);
406 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
407 extern void sdev_evt_send_simple(struct scsi_device *sdev,
408 			  enum scsi_device_event evt_type, gfp_t gfpflags);
409 extern int scsi_device_quiesce(struct scsi_device *sdev);
410 extern void scsi_device_resume(struct scsi_device *sdev);
411 extern void scsi_target_quiesce(struct scsi_target *);
412 extern void scsi_target_resume(struct scsi_target *);
413 extern void scsi_scan_target(struct device *parent, unsigned int channel,
414 			     unsigned int id, u64 lun, int rescan);
415 extern void scsi_target_reap(struct scsi_target *);
416 extern void scsi_target_block(struct device *);
417 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
418 extern void scsi_remove_target(struct device *);
419 extern void int_to_scsilun(u64, struct scsi_lun *);
420 extern u64 scsilun_to_int(struct scsi_lun *);
421 extern const char *scsi_device_state_name(enum scsi_device_state);
422 extern int scsi_is_sdev_device(const struct device *);
423 extern int scsi_is_target_device(const struct device *);
424 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
425 			int data_direction, void *buffer, unsigned bufflen,
426 			unsigned char *sense, int timeout, int retries,
427 			u64 flags, int *resid);
428 extern int scsi_execute_req_flags(struct scsi_device *sdev,
429 	const unsigned char *cmd, int data_direction, void *buffer,
430 	unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
431 	int retries, int *resid, u64 flags);
432 static inline int scsi_execute_req(struct scsi_device *sdev,
433 	const unsigned char *cmd, int data_direction, void *buffer,
434 	unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
435 	int retries, int *resid)
436 {
437 	return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
438 		bufflen, sshdr, timeout, retries, resid, 0);
439 }
440 extern void sdev_disable_disk_events(struct scsi_device *sdev);
441 extern void sdev_enable_disk_events(struct scsi_device *sdev);
442 
443 #ifdef CONFIG_PM_RUNTIME
444 extern int scsi_autopm_get_device(struct scsi_device *);
445 extern void scsi_autopm_put_device(struct scsi_device *);
446 #else
447 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
448 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
449 #endif /* CONFIG_PM_RUNTIME */
450 
451 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
452 {
453 	return device_reprobe(&sdev->sdev_gendev);
454 }
455 
456 static inline unsigned int sdev_channel(struct scsi_device *sdev)
457 {
458 	return sdev->channel;
459 }
460 
461 static inline unsigned int sdev_id(struct scsi_device *sdev)
462 {
463 	return sdev->id;
464 }
465 
466 #define scmd_id(scmd) sdev_id((scmd)->device)
467 #define scmd_channel(scmd) sdev_channel((scmd)->device)
468 
469 /*
470  * checks for positions of the SCSI state machine
471  */
472 static inline int scsi_device_online(struct scsi_device *sdev)
473 {
474 	return (sdev->sdev_state != SDEV_OFFLINE &&
475 		sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
476 		sdev->sdev_state != SDEV_DEL);
477 }
478 static inline int scsi_device_blocked(struct scsi_device *sdev)
479 {
480 	return sdev->sdev_state == SDEV_BLOCK ||
481 		sdev->sdev_state == SDEV_CREATED_BLOCK;
482 }
483 static inline int scsi_device_created(struct scsi_device *sdev)
484 {
485 	return sdev->sdev_state == SDEV_CREATED ||
486 		sdev->sdev_state == SDEV_CREATED_BLOCK;
487 }
488 
489 /* accessor functions for the SCSI parameters */
490 static inline int scsi_device_sync(struct scsi_device *sdev)
491 {
492 	return sdev->sdtr;
493 }
494 static inline int scsi_device_wide(struct scsi_device *sdev)
495 {
496 	return sdev->wdtr;
497 }
498 static inline int scsi_device_dt(struct scsi_device *sdev)
499 {
500 	return sdev->ppr;
501 }
502 static inline int scsi_device_dt_only(struct scsi_device *sdev)
503 {
504 	if (sdev->inquiry_len < 57)
505 		return 0;
506 	return (sdev->inquiry[56] & 0x0c) == 0x04;
507 }
508 static inline int scsi_device_ius(struct scsi_device *sdev)
509 {
510 	if (sdev->inquiry_len < 57)
511 		return 0;
512 	return sdev->inquiry[56] & 0x01;
513 }
514 static inline int scsi_device_qas(struct scsi_device *sdev)
515 {
516 	if (sdev->inquiry_len < 57)
517 		return 0;
518 	return sdev->inquiry[56] & 0x02;
519 }
520 static inline int scsi_device_enclosure(struct scsi_device *sdev)
521 {
522 	return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
523 }
524 
525 static inline int scsi_device_protection(struct scsi_device *sdev)
526 {
527 	if (sdev->no_dif)
528 		return 0;
529 
530 	return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
531 }
532 
533 static inline int scsi_device_tpgs(struct scsi_device *sdev)
534 {
535 	return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
536 }
537 
538 #define MODULE_ALIAS_SCSI_DEVICE(type) \
539 	MODULE_ALIAS("scsi:t-" __stringify(type) "*")
540 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
541 
542 #endif /* _SCSI_SCSI_DEVICE_H */
543