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TOMOYO Linux Cross Reference
Linux/include/scsi/scsi_device.h

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

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