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>
10 #include <asm/atomic.h>
15 struct scsi_sense_hdr;
17 struct scsi_mode_data {
19 __u16 block_descriptor_length;
27 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
28 * (for the ascii descriptions) and the state model enforcer:
29 * scsi_lib:scsi_device_set_state().
31 enum scsi_device_state {
32 SDEV_CREATED = 1, /* device created but not added to sysfs
33 * Only internal commands allowed (for inq) */
34 SDEV_RUNNING, /* device properly configured
35 * All commands allowed */
36 SDEV_CANCEL, /* beginning to delete device
37 * Only error handler commands allowed */
38 SDEV_DEL, /* device deleted
39 * no commands allowed */
40 SDEV_QUIESCE, /* Device quiescent. No block commands
41 * will be accepted, only specials (which
42 * originate in the mid-layer) */
43 SDEV_OFFLINE, /* Device offlined (by error handling or
45 SDEV_BLOCK, /* Device blocked by scsi lld. No
46 * scsi commands from user or midlayer
47 * should be issued to the scsi
49 SDEV_CREATED_BLOCK, /* same as above but for created devices */
52 enum scsi_device_event {
53 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
55 SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE,
56 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
60 enum scsi_device_event evt_type;
61 struct list_head node;
63 /* put union of data structures, for non-simple event types,
69 struct Scsi_Host *host;
70 struct request_queue *request_queue;
72 /* the next two are protected by the host->host_lock */
73 struct list_head siblings; /* list of all devices on this host */
74 struct list_head same_target_siblings; /* just the devices sharing same target id */
76 /* this is now protected by the request_queue->queue_lock */
77 unsigned int device_busy; /* commands actually active on
78 * low-level. protected by queue_lock. */
80 struct list_head cmd_list; /* queue of in use SCSI Command structures */
81 struct list_head starved_entry;
82 struct scsi_cmnd *current_cmnd; /* currently active command */
83 unsigned short queue_depth; /* How deep of a queue we want */
84 unsigned short max_queue_depth; /* max queue depth */
85 unsigned short last_queue_full_depth; /* These two are used by */
86 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
87 unsigned long last_queue_full_time; /* last queue full time */
88 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
89 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
91 unsigned long last_queue_ramp_up; /* last queue ramp up time */
93 unsigned int id, lun, channel;
95 unsigned int manufacturer; /* Manufacturer of device, for using
96 * vendor-specific cmd's */
97 unsigned sector_size; /* size in bytes */
99 void *hostdata; /* available to low-level driver */
102 char inq_periph_qual; /* PQ from INQUIRY data */
103 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
104 unsigned char * inquiry; /* INQUIRY response data */
105 const char * vendor; /* [back_compat] point into 'inquiry' ... */
106 const char * model; /* ... after scan; point to static string */
107 const char * rev; /* ... "nullnullnullnull" before scan */
108 unsigned char current_tag; /* current tag */
109 struct scsi_target *sdev_target; /* used only for single_lun */
111 unsigned int sdev_bflags; /* black/white flags as also found in
112 * scsi_devinfo.[hc]. For now used only to
113 * pass settings from slave_alloc to scsi
115 unsigned writeable:1;
116 unsigned removable:1;
117 unsigned changed:1; /* Data invalid due to media change */
118 unsigned busy:1; /* Used to prevent races */
119 unsigned lockable:1; /* Able to prevent media removal */
120 unsigned locked:1; /* Media removal disabled */
121 unsigned borken:1; /* Tell the Seagate driver to be
122 * painfully slow on this device */
123 unsigned disconnect:1; /* can disconnect */
124 unsigned soft_reset:1; /* Uses soft reset option */
125 unsigned sdtr:1; /* Device supports SDTR messages */
126 unsigned wdtr:1; /* Device supports WDTR messages */
127 unsigned ppr:1; /* Device supports PPR messages */
128 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
129 unsigned simple_tags:1; /* simple queue tag messages are enabled */
130 unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
131 unsigned was_reset:1; /* There was a bus reset on the bus for
133 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
134 * because we did a bus reset. */
135 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
136 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
137 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
138 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
139 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
140 unsigned no_start_on_add:1; /* do not issue start on add */
141 unsigned allow_restart:1; /* issue START_UNIT in error handler */
142 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
143 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
144 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
145 unsigned select_no_atn:1;
146 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
147 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
148 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
149 unsigned last_sector_bug:1; /* do not use multisector accesses on
150 SD_LAST_BUGGY_SECTORS */
151 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
152 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
153 unsigned is_visible:1; /* is the device visible in sysfs */
155 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
156 struct list_head event_list; /* asserted events */
157 struct work_struct event_work;
159 unsigned int device_blocked; /* Device returned QUEUE_FULL. */
161 unsigned int max_device_blocked; /* what device_blocked counts down from */
162 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
164 atomic_t iorequest_cnt;
168 struct device sdev_gendev,
171 struct execute_work ew; /* used to get process context on put */
173 struct scsi_dh_data *scsi_dh_data;
174 enum scsi_device_state sdev_state;
175 unsigned long sdev_data[0];
176 } __attribute__((aligned(sizeof(unsigned long))));
178 struct scsi_dh_devlist {
183 typedef void (*activate_complete)(void *, int);
184 struct scsi_device_handler {
185 /* Used by the infrastructure */
186 struct list_head list; /* list of scsi_device_handlers */
189 /* Filled by the hardware handler */
190 struct module *module;
192 const struct scsi_dh_devlist *devlist;
193 int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
194 int (*attach)(struct scsi_device *);
195 void (*detach)(struct scsi_device *);
196 int (*activate)(struct scsi_device *, activate_complete, void *);
197 int (*prep_fn)(struct scsi_device *, struct request *);
198 int (*set_params)(struct scsi_device *, const char *);
201 struct scsi_dh_data {
202 struct scsi_device_handler *scsi_dh;
203 struct scsi_device *sdev;
208 #define to_scsi_device(d) \
209 container_of(d, struct scsi_device, sdev_gendev)
210 #define class_to_sdev(d) \
211 container_of(d, struct scsi_device, sdev_dev)
212 #define transport_class_to_sdev(class_dev) \
213 to_scsi_device(class_dev->parent)
215 #define sdev_printk(prefix, sdev, fmt, a...) \
216 dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
218 #define scmd_printk(prefix, scmd, fmt, a...) \
219 (scmd)->request->rq_disk ? \
220 sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
221 (scmd)->request->rq_disk->disk_name, ##a) : \
222 sdev_printk(prefix, (scmd)->device, fmt, ##a)
224 enum scsi_target_state {
231 * scsi_target: representation of a scsi target, for now, this is only
232 * used for single_lun devices. If no one has active IO to the target,
233 * starget_sdev_user is NULL, else it points to the active sdev.
236 struct scsi_device *starget_sdev_user;
237 struct list_head siblings;
238 struct list_head devices;
240 unsigned int reap_ref; /* protected by the host lock */
241 unsigned int channel;
242 unsigned int id; /* target id ... replace
243 * scsi_device.id eventually */
244 unsigned int create:1; /* signal that it needs to be added */
245 unsigned int single_lun:1; /* Indicates we should only
246 * allow I/O to one of the luns
247 * for the device at a time. */
248 unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */
249 /* means no lun present */
250 /* commands actually active on LLD. protected by host lock. */
251 unsigned int target_busy;
253 * LLDs should set this in the slave_alloc host template callout.
254 * If set to zero then there is not limit.
256 unsigned int can_queue;
257 unsigned int target_blocked;
258 unsigned int max_target_blocked;
259 #define SCSI_DEFAULT_TARGET_BLOCKED 3
262 struct execute_work ew;
263 enum scsi_target_state state;
264 void *hostdata; /* available to low-level driver */
265 unsigned long starget_data[0]; /* for the transport */
266 /* starget_data must be the last element!!!! */
267 } __attribute__((aligned(sizeof(unsigned long))));
269 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
270 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
272 return to_scsi_target(sdev->sdev_gendev.parent);
274 #define transport_class_to_starget(class_dev) \
275 to_scsi_target(class_dev->parent)
277 #define starget_printk(prefix, starget, fmt, a...) \
278 dev_printk(prefix, &(starget)->dev, fmt, ##a)
280 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
281 uint, uint, uint, void *hostdata);
282 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
283 uint target, uint lun);
284 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
285 extern void scsi_remove_device(struct scsi_device *);
286 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
288 extern int scsi_device_get(struct scsi_device *);
289 extern void scsi_device_put(struct scsi_device *);
290 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
292 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
294 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
296 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
298 extern void starget_for_each_device(struct scsi_target *, void *,
299 void (*fn)(struct scsi_device *, void *));
300 extern void __starget_for_each_device(struct scsi_target *, void *,
301 void (*fn)(struct scsi_device *,
304 /* only exposed to implement shost_for_each_device */
305 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
306 struct scsi_device *);
309 * shost_for_each_device - iterate over all devices of a host
310 * @sdev: the &struct scsi_device to use as a cursor
311 * @shost: the &struct scsi_host to iterate over
313 * Iterator that returns each device attached to @shost. This loop
314 * takes a reference on each device and releases it at the end. If
315 * you break out of the loop, you must call scsi_device_put(sdev).
317 #define shost_for_each_device(sdev, shost) \
318 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
320 (sdev) = __scsi_iterate_devices((shost), (sdev)))
323 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
324 * @sdev: the &struct scsi_device to use as a cursor
325 * @shost: the &struct scsi_host to iterate over
327 * Iterator that returns each device attached to @shost. It does _not_
328 * take a reference on the scsi_device, so the whole loop must be
329 * protected by shost->host_lock.
331 * Note: The only reason to use this is because you need to access the
332 * device list in interrupt context. Otherwise you really want to use
333 * shost_for_each_device instead.
335 #define __shost_for_each_device(sdev, shost) \
336 list_for_each_entry((sdev), &((shost)->__devices), siblings)
338 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
339 extern int scsi_track_queue_full(struct scsi_device *, int);
341 extern int scsi_set_medium_removal(struct scsi_device *, char);
343 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
344 unsigned char *buffer, int len, int timeout,
345 int retries, struct scsi_mode_data *data,
346 struct scsi_sense_hdr *);
347 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
348 int modepage, unsigned char *buffer, int len,
349 int timeout, int retries,
350 struct scsi_mode_data *data,
351 struct scsi_sense_hdr *);
352 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
353 int retries, struct scsi_sense_hdr *sshdr);
354 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
356 extern int scsi_device_set_state(struct scsi_device *sdev,
357 enum scsi_device_state state);
358 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
360 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
361 extern void sdev_evt_send_simple(struct scsi_device *sdev,
362 enum scsi_device_event evt_type, gfp_t gfpflags);
363 extern int scsi_device_quiesce(struct scsi_device *sdev);
364 extern void scsi_device_resume(struct scsi_device *sdev);
365 extern void scsi_target_quiesce(struct scsi_target *);
366 extern void scsi_target_resume(struct scsi_target *);
367 extern void scsi_scan_target(struct device *parent, unsigned int channel,
368 unsigned int id, unsigned int lun, int rescan);
369 extern void scsi_target_reap(struct scsi_target *);
370 extern void scsi_target_block(struct device *);
371 extern void scsi_target_unblock(struct device *);
372 extern void scsi_remove_target(struct device *);
373 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
374 extern int scsilun_to_int(struct scsi_lun *);
375 extern const char *scsi_device_state_name(enum scsi_device_state);
376 extern int scsi_is_sdev_device(const struct device *);
377 extern int scsi_is_target_device(const struct device *);
378 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
379 int data_direction, void *buffer, unsigned bufflen,
380 unsigned char *sense, int timeout, int retries,
381 int flag, int *resid);
382 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
383 int data_direction, void *buffer, unsigned bufflen,
384 struct scsi_sense_hdr *, int timeout, int retries,
387 #ifdef CONFIG_PM_RUNTIME
388 extern int scsi_autopm_get_device(struct scsi_device *);
389 extern void scsi_autopm_put_device(struct scsi_device *);
391 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
392 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
393 #endif /* CONFIG_PM_RUNTIME */
395 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
397 return device_reprobe(&sdev->sdev_gendev);
400 static inline unsigned int sdev_channel(struct scsi_device *sdev)
402 return sdev->channel;
405 static inline unsigned int sdev_id(struct scsi_device *sdev)
410 #define scmd_id(scmd) sdev_id((scmd)->device)
411 #define scmd_channel(scmd) sdev_channel((scmd)->device)
414 * checks for positions of the SCSI state machine
416 static inline int scsi_device_online(struct scsi_device *sdev)
418 return (sdev->sdev_state != SDEV_OFFLINE &&
419 sdev->sdev_state != SDEV_DEL);
421 static inline int scsi_device_blocked(struct scsi_device *sdev)
423 return sdev->sdev_state == SDEV_BLOCK ||
424 sdev->sdev_state == SDEV_CREATED_BLOCK;
426 static inline int scsi_device_created(struct scsi_device *sdev)
428 return sdev->sdev_state == SDEV_CREATED ||
429 sdev->sdev_state == SDEV_CREATED_BLOCK;
432 /* accessor functions for the SCSI parameters */
433 static inline int scsi_device_sync(struct scsi_device *sdev)
437 static inline int scsi_device_wide(struct scsi_device *sdev)
441 static inline int scsi_device_dt(struct scsi_device *sdev)
445 static inline int scsi_device_dt_only(struct scsi_device *sdev)
447 if (sdev->inquiry_len < 57)
449 return (sdev->inquiry[56] & 0x0c) == 0x04;
451 static inline int scsi_device_ius(struct scsi_device *sdev)
453 if (sdev->inquiry_len < 57)
455 return sdev->inquiry[56] & 0x01;
457 static inline int scsi_device_qas(struct scsi_device *sdev)
459 if (sdev->inquiry_len < 57)
461 return sdev->inquiry[56] & 0x02;
463 static inline int scsi_device_enclosure(struct scsi_device *sdev)
465 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
468 static inline int scsi_device_protection(struct scsi_device *sdev)
470 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
473 #define MODULE_ALIAS_SCSI_DEVICE(type) \
474 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
475 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
477 #endif /* _SCSI_SCSI_DEVICE_H */