1 #ifndef _SCSI_SCSI_DEVICE_H
2 #define _SCSI_SCSI_DEVICE_H
4 #include <linux/device.h>
5 #include <linux/list.h>
6 #include <linux/spinlock.h>
7 #include <linux/workqueue.h>
8 #include <linux/blkdev.h>
9 #include <asm/atomic.h>
14 struct scsi_sense_hdr
;
16 struct scsi_mode_data
{
18 __u16 block_descriptor_length
;
26 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
27 * (for the ascii descriptions) and the state model enforcer:
28 * scsi_lib:scsi_device_set_state().
30 enum scsi_device_state
{
31 SDEV_CREATED
= 1, /* device created but not added to sysfs
32 * Only internal commands allowed (for inq) */
33 SDEV_RUNNING
, /* device properly configured
34 * All commands allowed */
35 SDEV_CANCEL
, /* beginning to delete device
36 * Only error handler commands allowed */
37 SDEV_DEL
, /* device deleted
38 * no commands allowed */
39 SDEV_QUIESCE
, /* Device quiescent. No block commands
40 * will be accepted, only specials (which
41 * originate in the mid-layer) */
42 SDEV_OFFLINE
, /* Device offlined (by error handling or
44 SDEV_BLOCK
, /* Device blocked by scsi lld. No scsi
45 * commands from user or midlayer should be issued
49 enum scsi_device_event
{
50 SDEV_EVT_MEDIA_CHANGE
= 1, /* media has changed */
52 SDEV_EVT_LAST
= SDEV_EVT_MEDIA_CHANGE
,
53 SDEV_EVT_MAXBITS
= SDEV_EVT_LAST
+ 1
57 enum scsi_device_event evt_type
;
58 struct list_head node
;
60 /* put union of data structures, for non-simple event types,
66 struct Scsi_Host
*host
;
67 struct request_queue
*request_queue
;
69 /* the next two are protected by the host->host_lock */
70 struct list_head siblings
; /* list of all devices on this host */
71 struct list_head same_target_siblings
; /* just the devices sharing same target id */
73 /* this is now protected by the request_queue->queue_lock */
74 unsigned int device_busy
; /* commands actually active on
75 * low-level. protected by queue_lock. */
77 struct list_head cmd_list
; /* queue of in use SCSI Command structures */
78 struct list_head starved_entry
;
79 struct scsi_cmnd
*current_cmnd
; /* currently active command */
80 unsigned short queue_depth
; /* How deep of a queue we want */
81 unsigned short last_queue_full_depth
; /* These two are used by */
82 unsigned short last_queue_full_count
; /* scsi_track_queue_full() */
83 unsigned long last_queue_full_time
;/* don't let QUEUE_FULLs on the same
84 jiffie count on our counter, they
85 could all be from the same event. */
87 unsigned int id
, lun
, channel
;
89 unsigned int manufacturer
; /* Manufacturer of device, for using
90 * vendor-specific cmd's */
91 unsigned sector_size
; /* size in bytes */
93 void *hostdata
; /* available to low-level driver */
96 char inq_periph_qual
; /* PQ from INQUIRY data */
97 unsigned char inquiry_len
; /* valid bytes in 'inquiry' */
98 unsigned char * inquiry
; /* INQUIRY response data */
99 const char * vendor
; /* [back_compat] point into 'inquiry' ... */
100 const char * model
; /* ... after scan; point to static string */
101 const char * rev
; /* ... "nullnullnullnull" before scan */
102 unsigned char current_tag
; /* current tag */
103 struct scsi_target
*sdev_target
; /* used only for single_lun */
105 unsigned int sdev_bflags
; /* black/white flags as also found in
106 * scsi_devinfo.[hc]. For now used only to
107 * pass settings from slave_alloc to scsi
109 unsigned writeable
:1;
110 unsigned removable
:1;
111 unsigned changed
:1; /* Data invalid due to media change */
112 unsigned busy
:1; /* Used to prevent races */
113 unsigned lockable
:1; /* Able to prevent media removal */
114 unsigned locked
:1; /* Media removal disabled */
115 unsigned borken
:1; /* Tell the Seagate driver to be
116 * painfully slow on this device */
117 unsigned disconnect
:1; /* can disconnect */
118 unsigned soft_reset
:1; /* Uses soft reset option */
119 unsigned sdtr
:1; /* Device supports SDTR messages */
120 unsigned wdtr
:1; /* Device supports WDTR messages */
121 unsigned ppr
:1; /* Device supports PPR messages */
122 unsigned tagged_supported
:1; /* Supports SCSI-II tagged queuing */
123 unsigned simple_tags
:1; /* simple queue tag messages are enabled */
124 unsigned ordered_tags
:1;/* ordered queue tag messages are enabled */
125 unsigned single_lun
:1; /* Indicates we should only allow I/O to
126 * one of the luns for the device at a
128 unsigned was_reset
:1; /* There was a bus reset on the bus for
130 unsigned expecting_cc_ua
:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
131 * because we did a bus reset. */
132 unsigned use_10_for_rw
:1; /* first try 10-byte read / write */
133 unsigned use_10_for_ms
:1; /* first try 10-byte mode sense/select */
134 unsigned skip_ms_page_8
:1; /* do not use MODE SENSE page 0x08 */
135 unsigned skip_ms_page_3f
:1; /* do not use MODE SENSE page 0x3f */
136 unsigned use_192_bytes_for_3f
:1; /* ask for 192 bytes from page 0x3f */
137 unsigned no_start_on_add
:1; /* do not issue start on add */
138 unsigned allow_restart
:1; /* issue START_UNIT in error handler */
139 unsigned manage_start_stop
:1; /* Let HLD (sd) manage start/stop */
140 unsigned no_uld_attach
:1; /* disable connecting to upper level drivers */
141 unsigned select_no_atn
:1;
142 unsigned fix_capacity
:1; /* READ_CAPACITY is too high by 1 */
143 unsigned guess_capacity
:1; /* READ_CAPACITY might be too high by 1 */
144 unsigned retry_hwerror
:1; /* Retry HARDWARE_ERROR */
146 DECLARE_BITMAP(supported_events
, SDEV_EVT_MAXBITS
); /* supported events */
147 struct list_head event_list
; /* asserted events */
148 struct work_struct event_work
;
150 unsigned int device_blocked
; /* Device returned QUEUE_FULL. */
152 unsigned int max_device_blocked
; /* what device_blocked counts down from */
153 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
155 atomic_t iorequest_cnt
;
161 struct device sdev_gendev
;
162 struct class_device sdev_classdev
;
164 struct execute_work ew
; /* used to get process context on put */
166 enum scsi_device_state sdev_state
;
167 unsigned long sdev_data
[0];
168 } __attribute__((aligned(sizeof(unsigned long))));
169 #define to_scsi_device(d) \
170 container_of(d, struct scsi_device, sdev_gendev)
171 #define class_to_sdev(d) \
172 container_of(d, struct scsi_device, sdev_classdev)
173 #define transport_class_to_sdev(class_dev) \
174 to_scsi_device(class_dev->dev)
176 #define sdev_printk(prefix, sdev, fmt, a...) \
177 dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
179 #define scmd_printk(prefix, scmd, fmt, a...) \
180 (scmd)->request->rq_disk ? \
181 sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
182 (scmd)->request->rq_disk->disk_name, ##a) : \
183 sdev_printk(prefix, (scmd)->device, fmt, ##a)
185 enum scsi_target_state
{
191 * scsi_target: representation of a scsi target, for now, this is only
192 * used for single_lun devices. If no one has active IO to the target,
193 * starget_sdev_user is NULL, else it points to the active sdev.
196 struct scsi_device
*starget_sdev_user
;
197 struct list_head siblings
;
198 struct list_head devices
;
200 unsigned int reap_ref
; /* protected by the host lock */
201 unsigned int channel
;
202 unsigned int id
; /* target id ... replace
203 * scsi_device.id eventually */
204 unsigned int create
:1; /* signal that it needs to be added */
205 unsigned int pdt_1f_for_no_lun
; /* PDT = 0x1f */
206 /* means no lun present */
209 struct execute_work ew
;
210 enum scsi_target_state state
;
211 void *hostdata
; /* available to low-level driver */
212 unsigned long starget_data
[0]; /* for the transport */
213 /* starget_data must be the last element!!!! */
214 } __attribute__((aligned(sizeof(unsigned long))));
216 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
217 static inline struct scsi_target
*scsi_target(struct scsi_device
*sdev
)
219 return to_scsi_target(sdev
->sdev_gendev
.parent
);
221 #define transport_class_to_starget(class_dev) \
222 to_scsi_target(class_dev->dev)
224 #define starget_printk(prefix, starget, fmt, a...) \
225 dev_printk(prefix, &(starget)->dev, fmt, ##a)
227 extern struct scsi_device
*__scsi_add_device(struct Scsi_Host
*,
228 uint
, uint
, uint
, void *hostdata
);
229 extern int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
230 uint target
, uint lun
);
231 extern void scsi_remove_device(struct scsi_device
*);
233 extern int scsi_device_get(struct scsi_device
*);
234 extern void scsi_device_put(struct scsi_device
*);
235 extern struct scsi_device
*scsi_device_lookup(struct Scsi_Host
*,
237 extern struct scsi_device
*__scsi_device_lookup(struct Scsi_Host
*,
239 extern struct scsi_device
*scsi_device_lookup_by_target(struct scsi_target
*,
241 extern struct scsi_device
*__scsi_device_lookup_by_target(struct scsi_target
*,
243 extern void starget_for_each_device(struct scsi_target
*, void *,
244 void (*fn
)(struct scsi_device
*, void *));
245 extern void __starget_for_each_device(struct scsi_target
*, void *,
246 void (*fn
)(struct scsi_device
*,
249 /* only exposed to implement shost_for_each_device */
250 extern struct scsi_device
*__scsi_iterate_devices(struct Scsi_Host
*,
251 struct scsi_device
*);
254 * shost_for_each_device - iterate over all devices of a host
255 * @sdev: the &struct scsi_device to use as a cursor
256 * @shost: the &struct scsi_host to iterate over
258 * Iterator that returns each device attached to @shost. This loop
259 * takes a reference on each device and releases it at the end. If
260 * you break out of the loop, you must call scsi_device_put(sdev).
262 #define shost_for_each_device(sdev, shost) \
263 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
265 (sdev) = __scsi_iterate_devices((shost), (sdev)))
268 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
269 * @sdev: the &struct scsi_device to use as a cursor
270 * @shost: the &struct scsi_host to iterate over
272 * Iterator that returns each device attached to @shost. It does _not_
273 * take a reference on the scsi_device, so the whole loop must be
274 * protected by shost->host_lock.
276 * Note: The only reason to use this is because you need to access the
277 * device list in interrupt context. Otherwise you really want to use
278 * shost_for_each_device instead.
280 #define __shost_for_each_device(sdev, shost) \
281 list_for_each_entry((sdev), &((shost)->__devices), siblings)
283 extern void scsi_adjust_queue_depth(struct scsi_device
*, int, int);
284 extern int scsi_track_queue_full(struct scsi_device
*, int);
286 extern int scsi_set_medium_removal(struct scsi_device
*, char);
288 extern int scsi_mode_sense(struct scsi_device
*sdev
, int dbd
, int modepage
,
289 unsigned char *buffer
, int len
, int timeout
,
290 int retries
, struct scsi_mode_data
*data
,
291 struct scsi_sense_hdr
*);
292 extern int scsi_mode_select(struct scsi_device
*sdev
, int pf
, int sp
,
293 int modepage
, unsigned char *buffer
, int len
,
294 int timeout
, int retries
,
295 struct scsi_mode_data
*data
,
296 struct scsi_sense_hdr
*);
297 extern int scsi_test_unit_ready(struct scsi_device
*sdev
, int timeout
,
299 extern int scsi_device_set_state(struct scsi_device
*sdev
,
300 enum scsi_device_state state
);
301 extern struct scsi_event
*sdev_evt_alloc(enum scsi_device_event evt_type
,
303 extern void sdev_evt_send(struct scsi_device
*sdev
, struct scsi_event
*evt
);
304 extern void sdev_evt_send_simple(struct scsi_device
*sdev
,
305 enum scsi_device_event evt_type
, gfp_t gfpflags
);
306 extern int scsi_device_quiesce(struct scsi_device
*sdev
);
307 extern void scsi_device_resume(struct scsi_device
*sdev
);
308 extern void scsi_target_quiesce(struct scsi_target
*);
309 extern void scsi_target_resume(struct scsi_target
*);
310 extern void scsi_scan_target(struct device
*parent
, unsigned int channel
,
311 unsigned int id
, unsigned int lun
, int rescan
);
312 extern void scsi_target_reap(struct scsi_target
*);
313 extern void scsi_target_block(struct device
*);
314 extern void scsi_target_unblock(struct device
*);
315 extern void scsi_remove_target(struct device
*);
316 extern void int_to_scsilun(unsigned int, struct scsi_lun
*);
317 extern int scsilun_to_int(struct scsi_lun
*);
318 extern const char *scsi_device_state_name(enum scsi_device_state
);
319 extern int scsi_is_sdev_device(const struct device
*);
320 extern int scsi_is_target_device(const struct device
*);
321 extern int scsi_execute(struct scsi_device
*sdev
, const unsigned char *cmd
,
322 int data_direction
, void *buffer
, unsigned bufflen
,
323 unsigned char *sense
, int timeout
, int retries
,
325 extern int scsi_execute_req(struct scsi_device
*sdev
, const unsigned char *cmd
,
326 int data_direction
, void *buffer
, unsigned bufflen
,
327 struct scsi_sense_hdr
*, int timeout
, int retries
);
328 extern int scsi_execute_async(struct scsi_device
*sdev
,
329 const unsigned char *cmd
, int cmd_len
, int data_direction
,
330 void *buffer
, unsigned bufflen
, int use_sg
,
331 int timeout
, int retries
, void *privdata
,
332 void (*done
)(void *, char *, int, int),
335 static inline int __must_check
scsi_device_reprobe(struct scsi_device
*sdev
)
337 return device_reprobe(&sdev
->sdev_gendev
);
340 static inline unsigned int sdev_channel(struct scsi_device
*sdev
)
342 return sdev
->channel
;
345 static inline unsigned int sdev_id(struct scsi_device
*sdev
)
350 #define scmd_id(scmd) sdev_id((scmd)->device)
351 #define scmd_channel(scmd) sdev_channel((scmd)->device)
353 static inline int scsi_device_online(struct scsi_device
*sdev
)
355 return sdev
->sdev_state
!= SDEV_OFFLINE
;
358 /* accessor functions for the SCSI parameters */
359 static inline int scsi_device_sync(struct scsi_device
*sdev
)
363 static inline int scsi_device_wide(struct scsi_device
*sdev
)
367 static inline int scsi_device_dt(struct scsi_device
*sdev
)
371 static inline int scsi_device_dt_only(struct scsi_device
*sdev
)
373 if (sdev
->inquiry_len
< 57)
375 return (sdev
->inquiry
[56] & 0x0c) == 0x04;
377 static inline int scsi_device_ius(struct scsi_device
*sdev
)
379 if (sdev
->inquiry_len
< 57)
381 return sdev
->inquiry
[56] & 0x01;
383 static inline int scsi_device_qas(struct scsi_device
*sdev
)
385 if (sdev
->inquiry_len
< 57)
387 return sdev
->inquiry
[56] & 0x02;
390 #define MODULE_ALIAS_SCSI_DEVICE(type) \
391 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
392 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
394 #endif /* _SCSI_SCSI_DEVICE_H */