~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.16 ] ~ [ linux-5.15.13 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.90 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.170 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.224 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.261 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.296 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.298 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp