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 /* this is now protected by the request_queue->queue_lock */
47 unsigned int device_busy; /* commands actually active on
48 * low-level. protected by queue_lock. */
50 struct list_head cmd_list; /* queue of in use SCSI Command structures */
51 struct list_head starved_entry;
52 struct scsi_cmnd *current_cmnd; /* currently active command */
53 unsigned short queue_depth; /* How deep of a queue we want */
54 unsigned short last_queue_full_depth; /* These two are used by */
55 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
56 unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
57 jiffie count on our counter, they
58 could all be from the same event. */
60 unsigned int id, lun, channel;
62 unsigned int manufacturer; /* Manufacturer of device, for using
63 * vendor-specific cmd's */
64 unsigned sector_size; /* size in bytes */
66 void *hostdata; /* available to low-level driver */
67 char devfs_name[256]; /* devfs junk */
70 char inq_periph_qual; /* PQ from INQUIRY data */
71 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
72 unsigned char * inquiry; /* INQUIRY response data */
73 char * vendor; /* [back_compat] point into 'inquiry' ... */
74 char * model; /* ... after scan; point to static string */
75 char * rev; /* ... "nullnullnullnull" before scan */
76 unsigned char current_tag; /* current tag */
77 struct scsi_target *sdev_target; /* used only for single_lun */
79 unsigned int sdev_bflags; /* black/white flags as also found in
80 * scsi_devinfo.[hc]. For now used only to
81 * pass settings from slave_alloc to scsi
85 unsigned changed:1; /* Data invalid due to media change */
86 unsigned busy:1; /* Used to prevent races */
87 unsigned lockable:1; /* Able to prevent media removal */
88 unsigned locked:1; /* Media removal disabled */
89 unsigned borken:1; /* Tell the Seagate driver to be
90 * painfully slow on this device */
91 unsigned disconnect:1; /* can disconnect */
92 unsigned soft_reset:1; /* Uses soft reset option */
93 unsigned sdtr:1; /* Device supports SDTR messages */
94 unsigned wdtr:1; /* Device supports WDTR messages */
95 unsigned ppr:1; /* Device supports PPR messages */
96 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
97 unsigned simple_tags:1; /* simple queue tag messages are enabled */
98 unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
99 unsigned single_lun:1; /* Indicates we should only allow I/O to
100 * one of the luns for the device at a
102 unsigned was_reset:1; /* There was a bus reset on the bus for
104 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
105 * because we did a bus reset. */
106 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
107 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
108 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
109 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
110 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
111 unsigned no_start_on_add:1; /* do not issue start on add */
112 unsigned allow_restart:1; /* issue START_UNIT in error handler */
113 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
114 unsigned select_no_atn:1;
115 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
116 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
118 unsigned int device_blocked; /* Device returned QUEUE_FULL. */
120 unsigned int max_device_blocked; /* what device_blocked counts down from */
121 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
123 atomic_t iorequest_cnt;
129 struct device sdev_gendev;
130 struct class_device sdev_classdev;
132 enum scsi_device_state sdev_state;
133 unsigned long sdev_data[0];
134 } __attribute__((aligned(sizeof(unsigned long))));
135 #define to_scsi_device(d) \
136 container_of(d, struct scsi_device, sdev_gendev)
137 #define class_to_sdev(d) \
138 container_of(d, struct scsi_device, sdev_classdev)
139 #define transport_class_to_sdev(class_dev) \
140 to_scsi_device(class_dev->dev)
143 * scsi_target: representation of a scsi target, for now, this is only
144 * used for single_lun devices. If no one has active IO to the target,
145 * starget_sdev_user is NULL, else it points to the active sdev.
148 struct scsi_device *starget_sdev_user;
149 struct list_head siblings;
150 struct list_head devices;
152 unsigned int reap_ref; /* protected by the host lock */
153 unsigned int channel;
154 unsigned int id; /* target id ... replace
155 * scsi_device.id eventually */
156 unsigned long create:1; /* signal that it needs to be added */
157 void *hostdata; /* available to low-level driver */
158 unsigned long starget_data[0]; /* for the transport */
159 /* starget_data must be the last element!!!! */
160 } __attribute__((aligned(sizeof(unsigned long))));
162 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
163 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
165 return to_scsi_target(sdev->sdev_gendev.parent);
167 #define transport_class_to_starget(class_dev) \
168 to_scsi_target(class_dev->dev)
170 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
171 uint, uint, uint, void *hostdata);
172 #define scsi_add_device(host, channel, target, lun) \
173 __scsi_add_device(host, channel, target, lun, NULL)
174 extern void scsi_remove_device(struct scsi_device *);
175 extern int scsi_device_cancel(struct scsi_device *, int);
177 extern int scsi_device_get(struct scsi_device *);
178 extern void scsi_device_put(struct scsi_device *);
179 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
181 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
183 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
185 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
187 extern void starget_for_each_device(struct scsi_target *, void *,
188 void (*fn)(struct scsi_device *, void *));
190 /* only exposed to implement shost_for_each_device */
191 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
192 struct scsi_device *);
195 * shost_for_each_device - iterate over all devices of a host
197 * @host: host whiches devices we want to iterate over
199 * This traverses over each devices of @shost. The devices have
200 * a reference that must be released by scsi_host_put when breaking
203 #define shost_for_each_device(sdev, shost) \
204 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
206 (sdev) = __scsi_iterate_devices((shost), (sdev)))
209 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
211 * @host: host whiches devices we want to iterate over
213 * This traverses over each devices of @shost. It does _not_ take a
214 * reference on the scsi_device, thus it the whole loop must be protected
215 * by shost->host_lock.
217 * Note: The only reason why drivers would want to use this is because
218 * they're need to access the device list in irq context. Otherwise you
219 * really want to use shost_for_each_device instead.
221 #define __shost_for_each_device(sdev, shost) \
222 list_for_each_entry((sdev), &((shost)->__devices), siblings)
224 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
225 extern int scsi_track_queue_full(struct scsi_device *, int);
227 extern int scsi_set_medium_removal(struct scsi_device *, char);
229 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
230 unsigned char *buffer, int len, int timeout,
231 int retries, struct scsi_mode_data *data);
232 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
234 extern int scsi_device_set_state(struct scsi_device *sdev,
235 enum scsi_device_state state);
236 extern int scsi_device_quiesce(struct scsi_device *sdev);
237 extern void scsi_device_resume(struct scsi_device *sdev);
238 extern void scsi_target_quiesce(struct scsi_target *);
239 extern void scsi_target_resume(struct scsi_target *);
240 extern void scsi_scan_target(struct device *parent, unsigned int channel,
241 unsigned int id, unsigned int lun, int rescan);
242 extern void scsi_target_reap(struct scsi_target *);
243 extern void scsi_target_block(struct device *);
244 extern void scsi_target_unblock(struct device *);
245 extern void scsi_remove_target(struct device *);
246 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
247 extern const char *scsi_device_state_name(enum scsi_device_state);
248 extern int scsi_is_sdev_device(const struct device *);
249 extern int scsi_is_target_device(const struct device *);
250 static inline int scsi_device_online(struct scsi_device *sdev)
252 return sdev->sdev_state != SDEV_OFFLINE;
255 /* accessor functions for the SCSI parameters */
256 static inline int scsi_device_sync(struct scsi_device *sdev)
260 static inline int scsi_device_wide(struct scsi_device *sdev)
264 static inline int scsi_device_dt(struct scsi_device *sdev)
268 static inline int scsi_device_dt_only(struct scsi_device *sdev)
270 if (sdev->inquiry_len < 57)
272 return (sdev->inquiry[56] & 0x0c) == 0x04;
274 static inline int scsi_device_ius(struct scsi_device *sdev)
276 if (sdev->inquiry_len < 57)
278 return sdev->inquiry[56] & 0x01;
280 static inline int scsi_device_qas(struct scsi_device *sdev)
282 if (sdev->inquiry_len < 57)
284 return sdev->inquiry[56] & 0x02;
286 #endif /* _SCSI_SCSI_DEVICE_H */