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>
13 struct scsi_mode_data {
15 __u16 block_descriptor_length;
23 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
24 * (for the ascii descriptions) and the state model enforcer:
25 * scsi_lib:scsi_device_set_state().
27 enum scsi_device_state {
28 SDEV_CREATED = 1, /* device created but not added to sysfs
29 * Only internal commands allowed (for inq) */
30 SDEV_RUNNING, /* device properly configured
31 * All commands allowed */
32 SDEV_CANCEL, /* beginning to delete device
33 * Only error handler commands allowed */
34 SDEV_DEL, /* device deleted
35 * no commands allowed */
36 SDEV_QUIESCE, /* Device quiescent. No block commands
37 * will be accepted, only specials (which
38 * originate in the mid-layer) */
39 SDEV_OFFLINE, /* Device offlined (by error handling or
41 SDEV_BLOCK, /* Device blocked by scsi lld. No scsi
42 * commands from user or midlayer should be issued
47 struct Scsi_Host *host;
48 struct request_queue *request_queue;
50 /* the next two are protected by the host->host_lock */
51 struct list_head siblings; /* list of all devices on this host */
52 struct list_head same_target_siblings; /* just the devices sharing same target id */
54 /* this is now protected by the request_queue->queue_lock */
55 unsigned int device_busy; /* commands actually active on
56 * low-level. protected by queue_lock. */
58 struct list_head cmd_list; /* queue of in use SCSI Command structures */
59 struct list_head starved_entry;
60 struct scsi_cmnd *current_cmnd; /* currently active command */
61 unsigned short queue_depth; /* How deep of a queue we want */
62 unsigned short last_queue_full_depth; /* These two are used by */
63 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
64 unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
65 jiffie count on our counter, they
66 could all be from the same event. */
68 unsigned int id, lun, channel;
70 unsigned int manufacturer; /* Manufacturer of device, for using
71 * vendor-specific cmd's */
72 unsigned sector_size; /* size in bytes */
74 void *hostdata; /* available to low-level driver */
75 char devfs_name[256]; /* devfs junk */
78 char inq_periph_qual; /* PQ from INQUIRY data */
79 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
80 unsigned char * inquiry; /* INQUIRY response data */
81 char * vendor; /* [back_compat] point into 'inquiry' ... */
82 char * model; /* ... after scan; point to static string */
83 char * rev; /* ... "nullnullnullnull" before scan */
84 unsigned char current_tag; /* current tag */
85 struct scsi_target *sdev_target; /* used only for single_lun */
87 unsigned int sdev_bflags; /* black/white flags as also found in
88 * scsi_devinfo.[hc]. For now used only to
89 * pass settings from slave_alloc to scsi
93 unsigned changed:1; /* Data invalid due to media change */
94 unsigned busy:1; /* Used to prevent races */
95 unsigned lockable:1; /* Able to prevent media removal */
96 unsigned locked:1; /* Media removal disabled */
97 unsigned borken:1; /* Tell the Seagate driver to be
98 * painfully slow on this device */
99 unsigned disconnect:1; /* can disconnect */
100 unsigned soft_reset:1; /* Uses soft reset option */
101 unsigned sdtr:1; /* Device supports SDTR messages */
102 unsigned wdtr:1; /* Device supports WDTR messages */
103 unsigned ppr:1; /* Device supports PPR messages */
104 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
105 unsigned simple_tags:1; /* simple queue tag messages are enabled */
106 unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
107 unsigned single_lun:1; /* Indicates we should only allow I/O to
108 * one of the luns for the device at a
110 unsigned was_reset:1; /* There was a bus reset on the bus for
112 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
113 * because we did a bus reset. */
114 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
115 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
116 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
117 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
118 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
119 unsigned no_start_on_add:1; /* do not issue start on add */
120 unsigned allow_restart:1; /* issue START_UNIT in error handler */
121 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
122 unsigned select_no_atn:1;
123 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
124 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
126 unsigned int device_blocked; /* Device returned QUEUE_FULL. */
128 unsigned int max_device_blocked; /* what device_blocked counts down from */
129 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
131 atomic_t iorequest_cnt;
137 struct device sdev_gendev;
138 struct class_device sdev_classdev;
140 enum scsi_device_state sdev_state;
141 unsigned long sdev_data[0];
142 } __attribute__((aligned(sizeof(unsigned long))));
143 #define to_scsi_device(d) \
144 container_of(d, struct scsi_device, sdev_gendev)
145 #define class_to_sdev(d) \
146 container_of(d, struct scsi_device, sdev_classdev)
147 #define transport_class_to_sdev(class_dev) \
148 to_scsi_device(class_dev->dev)
151 * scsi_target: representation of a scsi target, for now, this is only
152 * used for single_lun devices. If no one has active IO to the target,
153 * starget_sdev_user is NULL, else it points to the active sdev.
156 struct scsi_device *starget_sdev_user;
157 struct list_head siblings;
158 struct list_head devices;
160 unsigned int reap_ref; /* protected by the host lock */
161 unsigned int channel;
162 unsigned int id; /* target id ... replace
163 * scsi_device.id eventually */
164 unsigned long create:1; /* signal that it needs to be added */
165 void *hostdata; /* available to low-level driver */
166 unsigned long starget_data[0]; /* for the transport */
167 /* starget_data must be the last element!!!! */
168 } __attribute__((aligned(sizeof(unsigned long))));
170 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
171 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
173 return to_scsi_target(sdev->sdev_gendev.parent);
175 #define transport_class_to_starget(class_dev) \
176 to_scsi_target(class_dev->dev)
178 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
179 uint, uint, uint, void *hostdata);
180 #define scsi_add_device(host, channel, target, lun) \
181 __scsi_add_device(host, channel, target, lun, NULL)
182 extern void scsi_remove_device(struct scsi_device *);
183 extern int scsi_device_cancel(struct scsi_device *, int);
185 extern int scsi_device_get(struct scsi_device *);
186 extern void scsi_device_put(struct scsi_device *);
187 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
189 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
191 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
193 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
195 extern void starget_for_each_device(struct scsi_target *, void *,
196 void (*fn)(struct scsi_device *, void *));
198 /* only exposed to implement shost_for_each_device */
199 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
200 struct scsi_device *);
203 * shost_for_each_device - iterate over all devices of a host
205 * @host: host whiches devices we want to iterate over
207 * This traverses over each devices of @shost. The devices have
208 * a reference that must be released by scsi_host_put when breaking
211 #define shost_for_each_device(sdev, shost) \
212 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
214 (sdev) = __scsi_iterate_devices((shost), (sdev)))
217 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
219 * @host: host whiches devices we want to iterate over
221 * This traverses over each devices of @shost. It does _not_ take a
222 * reference on the scsi_device, thus it the whole loop must be protected
223 * by shost->host_lock.
225 * Note: The only reason why drivers would want to use this is because
226 * they're need to access the device list in irq context. Otherwise you
227 * really want to use shost_for_each_device instead.
229 #define __shost_for_each_device(sdev, shost) \
230 list_for_each_entry((sdev), &((shost)->__devices), siblings)
232 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
233 extern int scsi_track_queue_full(struct scsi_device *, int);
235 extern int scsi_set_medium_removal(struct scsi_device *, char);
237 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
238 unsigned char *buffer, int len, int timeout,
239 int retries, struct scsi_mode_data *data,
241 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
243 extern int scsi_device_set_state(struct scsi_device *sdev,
244 enum scsi_device_state state);
245 extern int scsi_device_quiesce(struct scsi_device *sdev);
246 extern void scsi_device_resume(struct scsi_device *sdev);
247 extern void scsi_target_quiesce(struct scsi_target *);
248 extern void scsi_target_resume(struct scsi_target *);
249 extern void scsi_scan_target(struct device *parent, unsigned int channel,
250 unsigned int id, unsigned int lun, int rescan);
251 extern void scsi_target_reap(struct scsi_target *);
252 extern void scsi_target_block(struct device *);
253 extern void scsi_target_unblock(struct device *);
254 extern void scsi_remove_target(struct device *);
255 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
256 extern const char *scsi_device_state_name(enum scsi_device_state);
257 extern int scsi_is_sdev_device(const struct device *);
258 extern int scsi_is_target_device(const struct device *);
259 static inline int scsi_device_online(struct scsi_device *sdev)
261 return sdev->sdev_state != SDEV_OFFLINE;
264 /* accessor functions for the SCSI parameters */
265 static inline int scsi_device_sync(struct scsi_device *sdev)
269 static inline int scsi_device_wide(struct scsi_device *sdev)
273 static inline int scsi_device_dt(struct scsi_device *sdev)
277 static inline int scsi_device_dt_only(struct scsi_device *sdev)
279 if (sdev->inquiry_len < 57)
281 return (sdev->inquiry[56] & 0x0c) == 0x04;
283 static inline int scsi_device_ius(struct scsi_device *sdev)
285 if (sdev->inquiry_len < 57)
287 return sdev->inquiry[56] & 0x01;
289 static inline int scsi_device_qas(struct scsi_device *sdev)
291 if (sdev->inquiry_len < 57)
293 return sdev->inquiry[56] & 0x02;
295 #endif /* _SCSI_SCSI_DEVICE_H */