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)
scsi_target(struct scsi_device * sdev)319 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
320 {
321 	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 })
scsi_execute_req(struct scsi_device * sdev,const unsigned char * cmd,int data_direction,void * buffer,unsigned bufflen,struct scsi_sense_hdr * sshdr,int timeout,int retries,int * resid)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 	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
scsi_autopm_get_device(struct scsi_device * d)463 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
scsi_autopm_put_device(struct scsi_device * d)464 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
465 #endif /* CONFIG_PM */
466 
scsi_device_reprobe(struct scsi_device * sdev)467 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
468 {
469 	return device_reprobe(&sdev->sdev_gendev);
470 }
471 
sdev_channel(struct scsi_device * sdev)472 static inline unsigned int sdev_channel(struct scsi_device *sdev)
473 {
474 	return sdev->channel;
475 }
476 
sdev_id(struct scsi_device * sdev)477 static inline unsigned int sdev_id(struct scsi_device *sdev)
478 {
479 	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  */
scsi_device_online(struct scsi_device * sdev)488 static inline int scsi_device_online(struct scsi_device *sdev)
489 {
490 	return (sdev->sdev_state != SDEV_OFFLINE &&
491 		sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
492 		sdev->sdev_state != SDEV_DEL);
493 }
scsi_device_blocked(struct scsi_device * sdev)494 static inline int scsi_device_blocked(struct scsi_device *sdev)
495 {
496 	return sdev->sdev_state == SDEV_BLOCK ||
497 		sdev->sdev_state == SDEV_CREATED_BLOCK;
498 }
scsi_device_created(struct scsi_device * sdev)499 static inline int scsi_device_created(struct scsi_device *sdev)
500 {
501 	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 */
scsi_device_sync(struct scsi_device * sdev)510 static inline int scsi_device_sync(struct scsi_device *sdev)
511 {
512 	return sdev->sdtr;
513 }
scsi_device_wide(struct scsi_device * sdev)514 static inline int scsi_device_wide(struct scsi_device *sdev)
515 {
516 	return sdev->wdtr;
517 }
scsi_device_dt(struct scsi_device * sdev)518 static inline int scsi_device_dt(struct scsi_device *sdev)
519 {
520 	return sdev->ppr;
521 }
scsi_device_dt_only(struct scsi_device * sdev)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 }
scsi_device_ius(struct scsi_device * sdev)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 }
scsi_device_qas(struct scsi_device * sdev)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 }
scsi_device_enclosure(struct scsi_device * sdev)540 static inline int scsi_device_enclosure(struct scsi_device *sdev)
541 {
542 	return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
543 }
544 
scsi_device_protection(struct scsi_device * sdev)545 static inline int scsi_device_protection(struct scsi_device *sdev)
546 {
547 	if (sdev->no_dif)
548 		return 0;
549 
550 	return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
551 }
552 
scsi_device_tpgs(struct scsi_device * sdev)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  */
scsi_device_supports_vpd(struct scsi_device * sdev)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 	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 	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 */
588