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
36 struct Scsi_Host *host;
37 struct request_queue *request_queue;
39 /* the next two are protected by the host->host_lock */
40 struct list_head siblings; /* list of all devices on this host */
41 struct list_head same_target_siblings; /* just the devices sharing same target id */
43 volatile unsigned short device_busy; /* commands actually active on low-level */
44 spinlock_t sdev_lock; /* also the request queue_lock */
46 struct list_head cmd_list; /* queue of in use SCSI Command structures */
47 struct list_head starved_entry;
48 struct scsi_cmnd *current_cmnd; /* currently active command */
49 unsigned short queue_depth; /* How deep of a queue we want */
50 unsigned short last_queue_full_depth; /* These two are used by */
51 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
52 unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
53 jiffie count on our counter, they
54 could all be from the same event. */
56 unsigned int id, lun, channel;
58 unsigned int manufacturer; /* Manufacturer of device, for using
59 * vendor-specific cmd's */
60 unsigned sector_size; /* size in bytes */
62 void *hostdata; /* available to low-level driver */
63 char devfs_name[256]; /* devfs junk */
66 char inq_periph_qual; /* PQ from INQUIRY data */
67 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
68 unsigned char * inquiry; /* INQUIRY response data */
69 char * vendor; /* [back_compat] point into 'inquiry' ... */
70 char * model; /* ... after scan; point to static string */
71 char * rev; /* ... "nullnullnullnull" before scan */
72 unsigned char current_tag; /* current tag */
73 struct scsi_target *sdev_target; /* used only for single_lun */
75 unsigned int sdev_bflags; /* black/white flags as also found in
76 * scsi_devinfo.[hc]. For now used only to
77 * pass settings from slave_alloc to scsi
81 unsigned changed:1; /* Data invalid due to media change */
82 unsigned busy:1; /* Used to prevent races */
83 unsigned lockable:1; /* Able to prevent media removal */
84 unsigned locked:1; /* Media removal disabled */
85 unsigned borken:1; /* Tell the Seagate driver to be
86 * painfully slow on this device */
87 unsigned disconnect:1; /* can disconnect */
88 unsigned soft_reset:1; /* Uses soft reset option */
89 unsigned sdtr:1; /* Device supports SDTR messages */
90 unsigned wdtr:1; /* Device supports WDTR messages */
91 unsigned ppr:1; /* Device supports PPR messages */
92 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
93 unsigned simple_tags:1; /* simple queue tag messages are enabled */
94 unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
95 unsigned single_lun:1; /* Indicates we should only allow I/O to
96 * one of the luns for the device at a
98 unsigned was_reset:1; /* There was a bus reset on the bus for
100 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
101 * because we did a bus reset. */
102 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
103 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
104 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
105 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
106 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
107 unsigned no_start_on_add:1; /* do not issue start on add */
108 unsigned allow_restart:1; /* issue START_UNIT in error handler */
110 unsigned int device_blocked; /* Device returned QUEUE_FULL. */
112 unsigned int max_device_blocked; /* what device_blocked counts down from */
113 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
117 struct device sdev_gendev;
118 struct class_device sdev_classdev;
120 struct class_device transport_classdev;
122 enum scsi_device_state sdev_state;
123 unsigned long transport_data[0];
124 } __attribute__((aligned(sizeof(unsigned long))));
125 #define to_scsi_device(d) \
126 container_of(d, struct scsi_device, sdev_gendev)
127 #define class_to_sdev(d) \
128 container_of(d, struct scsi_device, sdev_classdev)
129 #define transport_class_to_sdev(class_dev) \
130 container_of(class_dev, struct scsi_device, transport_classdev)
132 extern struct scsi_device *scsi_add_device(struct Scsi_Host *,
134 extern void scsi_remove_device(struct scsi_device *);
135 extern int scsi_device_cancel(struct scsi_device *, int);
137 extern int scsi_device_get(struct scsi_device *);
138 extern void scsi_device_put(struct scsi_device *);
139 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
141 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
144 /* only exposed to implement shost_for_each_device */
145 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
146 struct scsi_device *);
149 * shost_for_each_device - iterate over all devices of a host
151 * @host: host whiches devices we want to iterate over
153 * This traverses over each devices of @shost. The devices have
154 * a reference that must be released by scsi_host_put when breaking
157 #define shost_for_each_device(sdev, shost) \
158 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
160 (sdev) = __scsi_iterate_devices((shost), (sdev)))
163 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
165 * @host: host whiches devices we want to iterate over
167 * This traverses over each devices of @shost. It does _not_ take a
168 * reference on the scsi_device, thus it the whole loop must be protected
169 * by shost->host_lock.
171 * Note: The only reason why drivers would want to use this is because
172 * they're need to access the device list in irq context. Otherwise you
173 * really want to use shost_for_each_device instead.
175 #define __shost_for_each_device(sdev, shost) \
176 list_for_each_entry((sdev), &((shost)->__devices), siblings)
178 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
179 extern int scsi_track_queue_full(struct scsi_device *, int);
181 extern int scsi_set_medium_removal(struct scsi_device *, char);
183 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
184 unsigned char *buffer, int len, int timeout,
185 int retries, struct scsi_mode_data *data);
186 extern int scsi_device_set_state(struct scsi_device *sdev,
187 enum scsi_device_state state);
188 extern int scsi_device_quiesce(struct scsi_device *sdev);
189 extern void scsi_device_resume(struct scsi_device *sdev);
190 extern const char *scsi_device_state_name(enum scsi_device_state);
191 static int inline scsi_device_online(struct scsi_device *sdev)
193 return sdev->sdev_state != SDEV_OFFLINE;
195 #endif /* _SCSI_SCSI_DEVICE_H */