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 <asm/atomic.h>
11 struct scsi_mode_data
;
15 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
16 * (for the ascii descriptions) and the state model enforcer:
17 * scsi_lib:scsi_device_set_state().
19 enum scsi_device_state
{
20 SDEV_CREATED
= 1, /* device created but not added to sysfs
21 * Only internal commands allowed (for inq) */
22 SDEV_RUNNING
, /* device properly configured
23 * All commands allowed */
24 SDEV_CANCEL
, /* beginning to delete device
25 * Only error handler commands allowed */
26 SDEV_DEL
, /* device deleted
27 * no commands allowed */
28 SDEV_QUIESCE
, /* Device quiescent. No block commands
29 * will be accepted, only specials (which
30 * originate in the mid-layer) */
31 SDEV_OFFLINE
, /* Device offlined (by error handling or
33 SDEV_BLOCK
, /* Device blocked by scsi lld. No scsi
34 * commands from user or midlayer should be issued
39 struct Scsi_Host
*host
;
40 struct request_queue
*request_queue
;
42 /* the next two are protected by the host->host_lock */
43 struct list_head siblings
; /* list of all devices on this host */
44 struct list_head same_target_siblings
; /* just the devices sharing same target id */
46 volatile unsigned short device_busy
; /* commands actually active on low-level */
48 struct list_head cmd_list
; /* queue of in use SCSI Command structures */
49 struct list_head starved_entry
;
50 struct scsi_cmnd
*current_cmnd
; /* currently active command */
51 unsigned short queue_depth
; /* How deep of a queue we want */
52 unsigned short last_queue_full_depth
; /* These two are used by */
53 unsigned short last_queue_full_count
; /* scsi_track_queue_full() */
54 unsigned long last_queue_full_time
;/* don't let QUEUE_FULLs on the same
55 jiffie count on our counter, they
56 could all be from the same event. */
58 unsigned int id
, lun
, channel
;
60 unsigned int manufacturer
; /* Manufacturer of device, for using
61 * vendor-specific cmd's */
62 unsigned sector_size
; /* size in bytes */
64 void *hostdata
; /* available to low-level driver */
65 char devfs_name
[256]; /* devfs junk */
68 char inq_periph_qual
; /* PQ from INQUIRY data */
69 unsigned char inquiry_len
; /* valid bytes in 'inquiry' */
70 unsigned char * inquiry
; /* INQUIRY response data */
71 char * vendor
; /* [back_compat] point into 'inquiry' ... */
72 char * model
; /* ... after scan; point to static string */
73 char * rev
; /* ... "nullnullnullnull" before scan */
74 unsigned char current_tag
; /* current tag */
75 struct scsi_target
*sdev_target
; /* used only for single_lun */
77 unsigned int sdev_bflags
; /* black/white flags as also found in
78 * scsi_devinfo.[hc]. For now used only to
79 * pass settings from slave_alloc to scsi
83 unsigned changed
:1; /* Data invalid due to media change */
84 unsigned busy
:1; /* Used to prevent races */
85 unsigned lockable
:1; /* Able to prevent media removal */
86 unsigned locked
:1; /* Media removal disabled */
87 unsigned borken
:1; /* Tell the Seagate driver to be
88 * painfully slow on this device */
89 unsigned disconnect
:1; /* can disconnect */
90 unsigned soft_reset
:1; /* Uses soft reset option */
91 unsigned sdtr
:1; /* Device supports SDTR messages */
92 unsigned wdtr
:1; /* Device supports WDTR messages */
93 unsigned ppr
:1; /* Device supports PPR messages */
94 unsigned tagged_supported
:1; /* Supports SCSI-II tagged queuing */
95 unsigned simple_tags
:1; /* simple queue tag messages are enabled */
96 unsigned ordered_tags
:1;/* ordered queue tag messages are enabled */
97 unsigned single_lun
:1; /* Indicates we should only allow I/O to
98 * one of the luns for the device at a
100 unsigned was_reset
:1; /* There was a bus reset on the bus for
102 unsigned expecting_cc_ua
:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
103 * because we did a bus reset. */
104 unsigned use_10_for_rw
:1; /* first try 10-byte read / write */
105 unsigned use_10_for_ms
:1; /* first try 10-byte mode sense/select */
106 unsigned skip_ms_page_8
:1; /* do not use MODE SENSE page 0x08 */
107 unsigned skip_ms_page_3f
:1; /* do not use MODE SENSE page 0x3f */
108 unsigned use_192_bytes_for_3f
:1; /* ask for 192 bytes from page 0x3f */
109 unsigned no_start_on_add
:1; /* do not issue start on add */
110 unsigned allow_restart
:1; /* issue START_UNIT in error handler */
111 unsigned no_uld_attach
:1; /* disable connecting to upper level drivers */
112 unsigned select_no_atn
:1;
113 unsigned fix_capacity
:1; /* READ_CAPACITY is too high by 1 */
114 unsigned retry_hwerror
:1; /* Retry HARDWARE_ERROR */
116 unsigned int device_blocked
; /* Device returned QUEUE_FULL. */
118 unsigned int max_device_blocked
; /* what device_blocked counts down from */
119 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
121 atomic_t iorequest_cnt
;
127 struct device sdev_gendev
;
128 struct class_device sdev_classdev
;
130 enum scsi_device_state sdev_state
;
131 unsigned long sdev_data
[0];
132 } __attribute__((aligned(sizeof(unsigned long))));
133 #define to_scsi_device(d) \
134 container_of(d, struct scsi_device, sdev_gendev)
135 #define class_to_sdev(d) \
136 container_of(d, struct scsi_device, sdev_classdev)
137 #define transport_class_to_sdev(class_dev) \
138 to_scsi_device(class_dev->dev)
141 * scsi_target: representation of a scsi target, for now, this is only
142 * used for single_lun devices. If no one has active IO to the target,
143 * starget_sdev_user is NULL, else it points to the active sdev.
146 struct scsi_device
*starget_sdev_user
;
147 struct list_head siblings
;
148 struct list_head devices
;
150 unsigned int reap_ref
; /* protected by the host lock */
151 unsigned int channel
;
152 unsigned int id
; /* target id ... replace
153 * scsi_device.id eventually */
154 unsigned long create
:1; /* signal that it needs to be added */
155 unsigned long starget_data
[0];
156 } __attribute__((aligned(sizeof(unsigned long))));
158 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
159 static inline struct scsi_target
*scsi_target(struct scsi_device
*sdev
)
161 return to_scsi_target(sdev
->sdev_gendev
.parent
);
163 #define transport_class_to_starget(class_dev) \
164 to_scsi_target(class_dev->dev)
166 extern struct scsi_device
*__scsi_add_device(struct Scsi_Host
*,
167 uint
, uint
, uint
, void *hostdata
);
168 #define scsi_add_device(host, channel, target, lun) \
169 __scsi_add_device(host, channel, target, lun, NULL)
170 extern void scsi_remove_device(struct scsi_device
*);
171 extern int scsi_device_cancel(struct scsi_device
*, int);
173 extern int scsi_device_get(struct scsi_device
*);
174 extern void scsi_device_put(struct scsi_device
*);
175 extern struct scsi_device
*scsi_device_lookup(struct Scsi_Host
*,
177 extern struct scsi_device
*__scsi_device_lookup(struct Scsi_Host
*,
179 extern struct scsi_device
*scsi_device_lookup_by_target(struct scsi_target
*,
181 extern struct scsi_device
*__scsi_device_lookup_by_target(struct scsi_target
*,
183 extern void starget_for_each_device(struct scsi_target
*, void *,
184 void (*fn
)(struct scsi_device
*, void *));
186 /* only exposed to implement shost_for_each_device */
187 extern struct scsi_device
*__scsi_iterate_devices(struct Scsi_Host
*,
188 struct scsi_device
*);
191 * shost_for_each_device - iterate over all devices of a host
193 * @host: host whiches devices we want to iterate over
195 * This traverses over each devices of @shost. The devices have
196 * a reference that must be released by scsi_host_put when breaking
199 #define shost_for_each_device(sdev, shost) \
200 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
202 (sdev) = __scsi_iterate_devices((shost), (sdev)))
205 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
207 * @host: host whiches devices we want to iterate over
209 * This traverses over each devices of @shost. It does _not_ take a
210 * reference on the scsi_device, thus it the whole loop must be protected
211 * by shost->host_lock.
213 * Note: The only reason why drivers would want to use this is because
214 * they're need to access the device list in irq context. Otherwise you
215 * really want to use shost_for_each_device instead.
217 #define __shost_for_each_device(sdev, shost) \
218 list_for_each_entry((sdev), &((shost)->__devices), siblings)
220 extern void scsi_adjust_queue_depth(struct scsi_device
*, int, int);
221 extern int scsi_track_queue_full(struct scsi_device
*, int);
223 extern int scsi_set_medium_removal(struct scsi_device
*, char);
225 extern int scsi_mode_sense(struct scsi_device
*sdev
, int dbd
, int modepage
,
226 unsigned char *buffer
, int len
, int timeout
,
227 int retries
, struct scsi_mode_data
*data
);
228 extern int scsi_test_unit_ready(struct scsi_device
*sdev
, int timeout
,
230 extern int scsi_device_set_state(struct scsi_device
*sdev
,
231 enum scsi_device_state state
);
232 extern int scsi_device_quiesce(struct scsi_device
*sdev
);
233 extern void scsi_device_resume(struct scsi_device
*sdev
);
234 extern void scsi_target_quiesce(struct scsi_target
*);
235 extern void scsi_target_resume(struct scsi_target
*);
236 extern void scsi_scan_target(struct device
*parent
, unsigned int channel
,
237 unsigned int id
, unsigned int lun
, int rescan
);
238 extern void scsi_target_reap(struct scsi_target
*);
239 extern void scsi_target_block(struct device
*);
240 extern void scsi_target_unblock(struct device
*);
241 extern void scsi_remove_target(struct device
*);
242 extern const char *scsi_device_state_name(enum scsi_device_state
);
243 extern int scsi_is_sdev_device(const struct device
*);
244 extern int scsi_is_target_device(const struct device
*);
245 static inline int scsi_device_online(struct scsi_device
*sdev
)
247 return sdev
->sdev_state
!= SDEV_OFFLINE
;
250 /* accessor functions for the SCSI parameters */
251 static inline int scsi_device_sync(struct scsi_device
*sdev
)
255 static inline int scsi_device_wide(struct scsi_device
*sdev
)
259 static inline int scsi_device_dt(struct scsi_device
*sdev
)
263 static inline int scsi_device_dt_only(struct scsi_device
*sdev
)
265 if (sdev
->inquiry_len
< 57)
267 return (sdev
->inquiry
[56] & 0x0c) == 0x04;
269 static inline int scsi_device_ius(struct scsi_device
*sdev
)
271 if (sdev
->inquiry_len
< 57)
273 return sdev
->inquiry
[56] & 0x01;
275 static inline int scsi_device_qas(struct scsi_device
*sdev
)
277 if (sdev
->inquiry_len
< 57)
279 return sdev
->inquiry
[56] & 0x02;
281 #endif /* _SCSI_SCSI_DEVICE_H */