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
50 struct Scsi_Host *host;
51 struct request_queue *request_queue;
53 /* the next two are protected by the host->host_lock */
54 struct list_head siblings; /* list of all devices on this host */
55 struct list_head same_target_siblings; /* just the devices sharing same target id */
57 /* this is now protected by the request_queue->queue_lock */
58 unsigned int device_busy; /* commands actually active on
59 * low-level. protected by queue_lock. */
61 struct list_head cmd_list; /* queue of in use SCSI Command structures */
62 struct list_head starved_entry;
63 struct scsi_cmnd *current_cmnd; /* currently active command */
64 unsigned short queue_depth; /* How deep of a queue we want */
65 unsigned short last_queue_full_depth; /* These two are used by */
66 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
67 unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
68 jiffie count on our counter, they
69 could all be from the same event. */
71 unsigned int id, lun, channel;
73 unsigned int manufacturer; /* Manufacturer of device, for using
74 * vendor-specific cmd's */
75 unsigned sector_size; /* size in bytes */
77 void *hostdata; /* available to low-level driver */
80 char inq_periph_qual; /* PQ from INQUIRY data */
81 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
82 unsigned char * inquiry; /* INQUIRY response data */
83 const char * vendor; /* [back_compat] point into 'inquiry' ... */
84 const char * model; /* ... after scan; point to static string */
85 const char * rev; /* ... "nullnullnullnull" before scan */
86 unsigned char current_tag; /* current tag */
87 struct scsi_target *sdev_target; /* used only for single_lun */
89 unsigned int sdev_bflags; /* black/white flags as also found in
90 * scsi_devinfo.[hc]. For now used only to
91 * pass settings from slave_alloc to scsi
95 unsigned changed:1; /* Data invalid due to media change */
96 unsigned busy:1; /* Used to prevent races */
97 unsigned lockable:1; /* Able to prevent media removal */
98 unsigned locked:1; /* Media removal disabled */
99 unsigned borken:1; /* Tell the Seagate driver to be
100 * painfully slow on this device */
101 unsigned disconnect:1; /* can disconnect */
102 unsigned soft_reset:1; /* Uses soft reset option */
103 unsigned sdtr:1; /* Device supports SDTR messages */
104 unsigned wdtr:1; /* Device supports WDTR messages */
105 unsigned ppr:1; /* Device supports PPR messages */
106 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
107 unsigned simple_tags:1; /* simple queue tag messages are enabled */
108 unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
109 unsigned single_lun:1; /* Indicates we should only allow I/O to
110 * one of the luns for the device at a
112 unsigned was_reset:1; /* There was a bus reset on the bus for
114 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
115 * because we did a bus reset. */
116 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
117 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
118 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
119 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
120 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
121 unsigned no_start_on_add:1; /* do not issue start on add */
122 unsigned allow_restart:1; /* issue START_UNIT in error handler */
123 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
124 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
125 unsigned select_no_atn:1;
126 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
127 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
128 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
130 unsigned int device_blocked; /* Device returned QUEUE_FULL. */
132 unsigned int max_device_blocked; /* what device_blocked counts down from */
133 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
135 atomic_t iorequest_cnt;
141 struct device sdev_gendev;
142 struct class_device sdev_classdev;
144 struct execute_work ew; /* used to get process context on put */
146 enum scsi_device_state sdev_state;
147 unsigned long sdev_data[0];
148 } __attribute__((aligned(sizeof(unsigned long))));
149 #define to_scsi_device(d) \
150 container_of(d, struct scsi_device, sdev_gendev)
151 #define class_to_sdev(d) \
152 container_of(d, struct scsi_device, sdev_classdev)
153 #define transport_class_to_sdev(class_dev) \
154 to_scsi_device(class_dev->dev)
156 #define sdev_printk(prefix, sdev, fmt, a...) \
157 dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
159 #define scmd_printk(prefix, scmd, fmt, a...) \
160 (scmd)->request->rq_disk ? \
161 sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
162 (scmd)->request->rq_disk->disk_name, ##a) : \
163 sdev_printk(prefix, (scmd)->device, fmt, ##a)
165 enum scsi_target_state {
171 * scsi_target: representation of a scsi target, for now, this is only
172 * used for single_lun devices. If no one has active IO to the target,
173 * starget_sdev_user is NULL, else it points to the active sdev.
176 struct scsi_device *starget_sdev_user;
177 struct list_head siblings;
178 struct list_head devices;
180 unsigned int reap_ref; /* protected by the host lock */
181 unsigned int channel;
182 unsigned int id; /* target id ... replace
183 * scsi_device.id eventually */
184 unsigned int create:1; /* signal that it needs to be added */
185 unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */
186 /* means no lun present */
189 struct execute_work ew;
190 enum scsi_target_state state;
191 void *hostdata; /* available to low-level driver */
192 unsigned long starget_data[0]; /* for the transport */
193 /* starget_data must be the last element!!!! */
194 } __attribute__((aligned(sizeof(unsigned long))));
196 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
197 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
199 return to_scsi_target(sdev->sdev_gendev.parent);
201 #define transport_class_to_starget(class_dev) \
202 to_scsi_target(class_dev->dev)
204 #define starget_printk(prefix, starget, fmt, a...) \
205 dev_printk(prefix, &(starget)->dev, fmt, ##a)
207 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
208 uint, uint, uint, void *hostdata);
209 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
210 uint target, uint lun);
211 extern void scsi_remove_device(struct scsi_device *);
212 extern int scsi_device_cancel(struct scsi_device *, int);
214 extern int scsi_device_get(struct scsi_device *);
215 extern void scsi_device_put(struct scsi_device *);
216 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
218 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
220 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
222 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
224 extern void starget_for_each_device(struct scsi_target *, void *,
225 void (*fn)(struct scsi_device *, void *));
227 /* only exposed to implement shost_for_each_device */
228 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
229 struct scsi_device *);
232 * shost_for_each_device - iterate over all devices of a host
233 * @sdev: the &struct scsi_device to use as a cursor
234 * @shost: the &struct scsi_host to iterate over
236 * Iterator that returns each device attached to @shost. This loop
237 * takes a reference on each device and releases it at the end. If
238 * you break out of the loop, you must call scsi_device_put(sdev).
240 #define shost_for_each_device(sdev, shost) \
241 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
243 (sdev) = __scsi_iterate_devices((shost), (sdev)))
246 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
247 * @sdev: the &struct scsi_device to use as a cursor
248 * @shost: the &struct scsi_host to iterate over
250 * Iterator that returns each device attached to @shost. It does _not_
251 * take a reference on the scsi_device, so the whole loop must be
252 * protected by shost->host_lock.
254 * Note: The only reason to use this is because you need to access the
255 * device list in interrupt context. Otherwise you really want to use
256 * shost_for_each_device instead.
258 #define __shost_for_each_device(sdev, shost) \
259 list_for_each_entry((sdev), &((shost)->__devices), siblings)
261 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
262 extern int scsi_track_queue_full(struct scsi_device *, int);
264 extern int scsi_set_medium_removal(struct scsi_device *, char);
266 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
267 unsigned char *buffer, int len, int timeout,
268 int retries, struct scsi_mode_data *data,
269 struct scsi_sense_hdr *);
270 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
271 int modepage, unsigned char *buffer, int len,
272 int timeout, int retries,
273 struct scsi_mode_data *data,
274 struct scsi_sense_hdr *);
275 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
277 extern int scsi_device_set_state(struct scsi_device *sdev,
278 enum scsi_device_state state);
279 extern int scsi_device_quiesce(struct scsi_device *sdev);
280 extern void scsi_device_resume(struct scsi_device *sdev);
281 extern void scsi_target_quiesce(struct scsi_target *);
282 extern void scsi_target_resume(struct scsi_target *);
283 extern void scsi_scan_target(struct device *parent, unsigned int channel,
284 unsigned int id, unsigned int lun, int rescan);
285 extern void scsi_target_reap(struct scsi_target *);
286 extern void scsi_target_block(struct device *);
287 extern void scsi_target_unblock(struct device *);
288 extern void scsi_remove_target(struct device *);
289 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
290 extern const char *scsi_device_state_name(enum scsi_device_state);
291 extern int scsi_is_sdev_device(const struct device *);
292 extern int scsi_is_target_device(const struct device *);
293 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
294 int data_direction, void *buffer, unsigned bufflen,
295 unsigned char *sense, int timeout, int retries,
297 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
298 int data_direction, void *buffer, unsigned bufflen,
299 struct scsi_sense_hdr *, int timeout, int retries);
300 extern int scsi_execute_async(struct scsi_device *sdev,
301 const unsigned char *cmd, int cmd_len, int data_direction,
302 void *buffer, unsigned bufflen, int use_sg,
303 int timeout, int retries, void *privdata,
304 void (*done)(void *, char *, int, int),
307 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
309 return device_reprobe(&sdev->sdev_gendev);
312 static inline unsigned int sdev_channel(struct scsi_device *sdev)
314 return sdev->channel;
317 static inline unsigned int sdev_id(struct scsi_device *sdev)
322 #define scmd_id(scmd) sdev_id((scmd)->device)
323 #define scmd_channel(scmd) sdev_channel((scmd)->device)
325 static inline int scsi_device_online(struct scsi_device *sdev)
327 return sdev->sdev_state != SDEV_OFFLINE;
330 /* accessor functions for the SCSI parameters */
331 static inline int scsi_device_sync(struct scsi_device *sdev)
335 static inline int scsi_device_wide(struct scsi_device *sdev)
339 static inline int scsi_device_dt(struct scsi_device *sdev)
343 static inline int scsi_device_dt_only(struct scsi_device *sdev)
345 if (sdev->inquiry_len < 57)
347 return (sdev->inquiry[56] & 0x0c) == 0x04;
349 static inline int scsi_device_ius(struct scsi_device *sdev)
351 if (sdev->inquiry_len < 57)
353 return sdev->inquiry[56] & 0x01;
355 static inline int scsi_device_qas(struct scsi_device *sdev)
357 if (sdev->inquiry_len < 57)
359 return sdev->inquiry[56] & 0x02;
362 #define MODULE_ALIAS_SCSI_DEVICE(type) \
363 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
364 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
366 #endif /* _SCSI_SCSI_DEVICE_H */