1 #ifndef _SCSI_SCSI_DEVICE_H
2 #define _SCSI_SCSI_DEVICE_H
4 #include <linux/list.h>
5 #include <linux/spinlock.h>
6 #include <linux/workqueue.h>
7 #include <linux/blkdev.h>
9 #include <linux/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_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
46 SDEV_BLOCK, /* Device blocked by scsi lld. No
47 * scsi commands from user or midlayer
48 * should be issued to the scsi
50 SDEV_CREATED_BLOCK, /* same as above but for created devices */
53 enum scsi_device_event {
54 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
55 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
56 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
57 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
58 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
59 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
61 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
62 SDEV_EVT_LAST = SDEV_EVT_LUN_CHANGE_REPORTED,
64 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
68 enum scsi_device_event evt_type;
69 struct list_head node;
71 /* put union of data structures, for non-simple event types,
77 struct Scsi_Host *host;
78 struct request_queue *request_queue;
80 /* the next two are protected by the host->host_lock */
81 struct list_head siblings; /* list of all devices on this host */
82 struct list_head same_target_siblings; /* just the devices sharing same target id */
84 /* this is now protected by the request_queue->queue_lock */
85 unsigned int device_busy; /* commands actually active on
86 * low-level. protected by queue_lock. */
88 struct list_head cmd_list; /* queue of in use SCSI Command structures */
89 struct list_head starved_entry;
90 struct scsi_cmnd *current_cmnd; /* currently active command */
91 unsigned short queue_depth; /* How deep of a queue we want */
92 unsigned short max_queue_depth; /* max queue depth */
93 unsigned short last_queue_full_depth; /* These two are used by */
94 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
95 unsigned long last_queue_full_time; /* last queue full time */
96 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
97 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
99 unsigned long last_queue_ramp_up; /* last queue ramp up time */
101 unsigned int id, lun, channel;
103 unsigned int manufacturer; /* Manufacturer of device, for using
104 * vendor-specific cmd's */
105 unsigned sector_size; /* size in bytes */
107 void *hostdata; /* available to low-level driver */
110 char inq_periph_qual; /* PQ from INQUIRY data */
111 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
112 unsigned char * inquiry; /* INQUIRY response data */
113 const char * vendor; /* [back_compat] point into 'inquiry' ... */
114 const char * model; /* ... after scan; point to static string */
115 const char * rev; /* ... "nullnullnullnull" before scan */
116 unsigned char current_tag; /* current tag */
117 struct scsi_target *sdev_target; /* used only for single_lun */
119 unsigned int sdev_bflags; /* black/white flags as also found in
120 * scsi_devinfo.[hc]. For now used only to
121 * pass settings from slave_alloc to scsi
123 unsigned int eh_timeout; /* Error handling timeout */
124 unsigned writeable:1;
125 unsigned removable:1;
126 unsigned changed:1; /* Data invalid due to media change */
127 unsigned busy:1; /* Used to prevent races */
128 unsigned lockable:1; /* Able to prevent media removal */
129 unsigned locked:1; /* Media removal disabled */
130 unsigned borken:1; /* Tell the Seagate driver to be
131 * painfully slow on this device */
132 unsigned disconnect:1; /* can disconnect */
133 unsigned soft_reset:1; /* Uses soft reset option */
134 unsigned sdtr:1; /* Device supports SDTR messages */
135 unsigned wdtr:1; /* Device supports WDTR messages */
136 unsigned ppr:1; /* Device supports PPR messages */
137 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
138 unsigned simple_tags:1; /* simple queue tag messages are enabled */
139 unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
140 unsigned was_reset:1; /* There was a bus reset on the bus for
142 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
143 * because we did a bus reset. */
144 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
145 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
146 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
147 unsigned no_write_same:1; /* no WRITE SAME command */
148 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
149 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
150 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
151 unsigned skip_vpd_pages:1; /* do not read VPD pages */
152 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
153 unsigned no_start_on_add:1; /* do not issue start on add */
154 unsigned allow_restart:1; /* issue START_UNIT in error handler */
155 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
156 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
157 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
158 unsigned select_no_atn:1;
159 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
160 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
161 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
162 unsigned last_sector_bug:1; /* do not use multisector accesses on
163 SD_LAST_BUGGY_SECTORS */
164 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
165 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
166 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
167 unsigned is_visible:1; /* is the device visible in sysfs */
168 unsigned wce_default_on:1; /* Cache is ON by default */
169 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
171 atomic_t disk_events_disable_depth; /* disable depth for disk events */
173 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
174 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
175 struct list_head event_list; /* asserted events */
176 struct work_struct event_work;
178 unsigned int device_blocked; /* Device returned QUEUE_FULL. */
180 unsigned int max_device_blocked; /* what device_blocked counts down from */
181 #define SCSI_DEFAULT_DEVICE_BLOCKED 3
183 atomic_t iorequest_cnt;
187 struct device sdev_gendev,
190 struct execute_work ew; /* used to get process context on put */
191 struct work_struct requeue_work;
193 struct scsi_dh_data *scsi_dh_data;
194 enum scsi_device_state sdev_state;
195 unsigned long sdev_data[0];
196 } __attribute__((aligned(sizeof(unsigned long))));
198 struct scsi_dh_devlist {
203 typedef void (*activate_complete)(void *, int);
204 struct scsi_device_handler {
205 /* Used by the infrastructure */
206 struct list_head list; /* list of scsi_device_handlers */
208 /* Filled by the hardware handler */
209 struct module *module;
211 const struct scsi_dh_devlist *devlist;
212 int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
213 int (*attach)(struct scsi_device *);
214 void (*detach)(struct scsi_device *);
215 int (*activate)(struct scsi_device *, activate_complete, void *);
216 int (*prep_fn)(struct scsi_device *, struct request *);
217 int (*set_params)(struct scsi_device *, const char *);
218 bool (*match)(struct scsi_device *);
221 struct scsi_dh_data {
222 struct scsi_device_handler *scsi_dh;
223 struct scsi_device *sdev;
228 #define to_scsi_device(d) \
229 container_of(d, struct scsi_device, sdev_gendev)
230 #define class_to_sdev(d) \
231 container_of(d, struct scsi_device, sdev_dev)
232 #define transport_class_to_sdev(class_dev) \
233 to_scsi_device(class_dev->parent)
235 #define sdev_printk(prefix, sdev, fmt, a...) \
236 dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
238 #define sdev_dbg(sdev, fmt, a...) \
239 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
241 #define scmd_printk(prefix, scmd, fmt, a...) \
242 (scmd)->request->rq_disk ? \
243 sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
244 (scmd)->request->rq_disk->disk_name, ##a) : \
245 sdev_printk(prefix, (scmd)->device, fmt, ##a)
247 #define scmd_dbg(scmd, fmt, a...) \
249 if ((scmd)->request->rq_disk) \
250 sdev_dbg((scmd)->device, "[%s] " fmt, \
251 (scmd)->request->rq_disk->disk_name, ##a);\
253 sdev_dbg((scmd)->device, fmt, ##a); \
256 enum scsi_target_state {
263 * scsi_target: representation of a scsi target, for now, this is only
264 * used for single_lun devices. If no one has active IO to the target,
265 * starget_sdev_user is NULL, else it points to the active sdev.
268 struct scsi_device *starget_sdev_user;
269 struct list_head siblings;
270 struct list_head devices;
272 struct kref reap_ref; /* last put renders target invisible */
273 unsigned int channel;
274 unsigned int id; /* target id ... replace
275 * scsi_device.id eventually */
276 unsigned int create:1; /* signal that it needs to be added */
277 unsigned int single_lun:1; /* Indicates we should only
278 * allow I/O to one of the luns
279 * for the device at a time. */
280 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
281 * means no lun present. */
282 unsigned int no_report_luns:1; /* Don't use
283 * REPORT LUNS for scanning. */
284 unsigned int expecting_lun_change:1; /* A device has reported
285 * a 3F/0E UA, other devices on
286 * the same target will also. */
287 /* commands actually active on LLD. protected by host lock. */
288 unsigned int target_busy;
290 * LLDs should set this in the slave_alloc host template callout.
291 * If set to zero then there is not limit.
293 unsigned int can_queue;
294 unsigned int target_blocked;
295 unsigned int max_target_blocked;
296 #define SCSI_DEFAULT_TARGET_BLOCKED 3
299 enum scsi_target_state state;
300 void *hostdata; /* available to low-level driver */
301 unsigned long starget_data[0]; /* for the transport */
302 /* starget_data must be the last element!!!! */
303 } __attribute__((aligned(sizeof(unsigned long))));
305 #define to_scsi_target(d) container_of(d, struct scsi_target, dev)
306 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
308 return to_scsi_target(sdev->sdev_gendev.parent);
310 #define transport_class_to_starget(class_dev) \
311 to_scsi_target(class_dev->parent)
313 #define starget_printk(prefix, starget, fmt, a...) \
314 dev_printk(prefix, &(starget)->dev, fmt, ##a)
316 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
317 uint, uint, uint, void *hostdata);
318 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
319 uint target, uint lun);
320 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
321 extern void scsi_remove_device(struct scsi_device *);
322 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
324 extern int scsi_device_get(struct scsi_device *);
325 extern void scsi_device_put(struct scsi_device *);
326 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
328 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
330 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
332 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
334 extern void starget_for_each_device(struct scsi_target *, void *,
335 void (*fn)(struct scsi_device *, void *));
336 extern void __starget_for_each_device(struct scsi_target *, void *,
337 void (*fn)(struct scsi_device *,
340 /* only exposed to implement shost_for_each_device */
341 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
342 struct scsi_device *);
345 * shost_for_each_device - iterate over all devices of a host
346 * @sdev: the &struct scsi_device to use as a cursor
347 * @shost: the &struct scsi_host to iterate over
349 * Iterator that returns each device attached to @shost. This loop
350 * takes a reference on each device and releases it at the end. If
351 * you break out of the loop, you must call scsi_device_put(sdev).
353 #define shost_for_each_device(sdev, shost) \
354 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
356 (sdev) = __scsi_iterate_devices((shost), (sdev)))
359 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
360 * @sdev: the &struct scsi_device to use as a cursor
361 * @shost: the &struct scsi_host to iterate over
363 * Iterator that returns each device attached to @shost. It does _not_
364 * take a reference on the scsi_device, so the whole loop must be
365 * protected by shost->host_lock.
367 * Note: The only reason to use this is because you need to access the
368 * device list in interrupt context. Otherwise you really want to use
369 * shost_for_each_device instead.
371 #define __shost_for_each_device(sdev, shost) \
372 list_for_each_entry((sdev), &((shost)->__devices), siblings)
374 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
375 extern int scsi_track_queue_full(struct scsi_device *, int);
377 extern int scsi_set_medium_removal(struct scsi_device *, char);
379 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
380 unsigned char *buffer, int len, int timeout,
381 int retries, struct scsi_mode_data *data,
382 struct scsi_sense_hdr *);
383 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
384 int modepage, unsigned char *buffer, int len,
385 int timeout, int retries,
386 struct scsi_mode_data *data,
387 struct scsi_sense_hdr *);
388 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
389 int retries, struct scsi_sense_hdr *sshdr);
390 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
392 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
393 unsigned int len, unsigned char opcode);
394 extern int scsi_device_set_state(struct scsi_device *sdev,
395 enum scsi_device_state state);
396 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
398 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
399 extern void sdev_evt_send_simple(struct scsi_device *sdev,
400 enum scsi_device_event evt_type, gfp_t gfpflags);
401 extern int scsi_device_quiesce(struct scsi_device *sdev);
402 extern void scsi_device_resume(struct scsi_device *sdev);
403 extern void scsi_target_quiesce(struct scsi_target *);
404 extern void scsi_target_resume(struct scsi_target *);
405 extern void scsi_scan_target(struct device *parent, unsigned int channel,
406 unsigned int id, unsigned int lun, int rescan);
407 extern void scsi_target_reap(struct scsi_target *);
408 extern void scsi_target_block(struct device *);
409 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
410 extern void scsi_remove_target(struct device *);
411 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
412 extern int scsilun_to_int(struct scsi_lun *);
413 extern const char *scsi_device_state_name(enum scsi_device_state);
414 extern int scsi_is_sdev_device(const struct device *);
415 extern int scsi_is_target_device(const struct device *);
416 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
417 int data_direction, void *buffer, unsigned bufflen,
418 unsigned char *sense, int timeout, int retries,
419 int flag, int *resid);
420 extern int scsi_execute_req_flags(struct scsi_device *sdev,
421 const unsigned char *cmd, int data_direction, void *buffer,
422 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
423 int retries, int *resid, int flags);
424 static inline int scsi_execute_req(struct scsi_device *sdev,
425 const unsigned char *cmd, int data_direction, void *buffer,
426 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
427 int retries, int *resid)
429 return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
430 bufflen, sshdr, timeout, retries, resid, 0);
432 extern void sdev_disable_disk_events(struct scsi_device *sdev);
433 extern void sdev_enable_disk_events(struct scsi_device *sdev);
435 #ifdef CONFIG_PM_RUNTIME
436 extern int scsi_autopm_get_device(struct scsi_device *);
437 extern void scsi_autopm_put_device(struct scsi_device *);
439 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
440 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
441 #endif /* CONFIG_PM_RUNTIME */
443 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
445 return device_reprobe(&sdev->sdev_gendev);
448 static inline unsigned int sdev_channel(struct scsi_device *sdev)
450 return sdev->channel;
453 static inline unsigned int sdev_id(struct scsi_device *sdev)
458 #define scmd_id(scmd) sdev_id((scmd)->device)
459 #define scmd_channel(scmd) sdev_channel((scmd)->device)
462 * checks for positions of the SCSI state machine
464 static inline int scsi_device_online(struct scsi_device *sdev)
466 return (sdev->sdev_state != SDEV_OFFLINE &&
467 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
468 sdev->sdev_state != SDEV_DEL);
470 static inline int scsi_device_blocked(struct scsi_device *sdev)
472 return sdev->sdev_state == SDEV_BLOCK ||
473 sdev->sdev_state == SDEV_CREATED_BLOCK;
475 static inline int scsi_device_created(struct scsi_device *sdev)
477 return sdev->sdev_state == SDEV_CREATED ||
478 sdev->sdev_state == SDEV_CREATED_BLOCK;
481 /* accessor functions for the SCSI parameters */
482 static inline int scsi_device_sync(struct scsi_device *sdev)
486 static inline int scsi_device_wide(struct scsi_device *sdev)
490 static inline int scsi_device_dt(struct scsi_device *sdev)
494 static inline int scsi_device_dt_only(struct scsi_device *sdev)
496 if (sdev->inquiry_len < 57)
498 return (sdev->inquiry[56] & 0x0c) == 0x04;
500 static inline int scsi_device_ius(struct scsi_device *sdev)
502 if (sdev->inquiry_len < 57)
504 return sdev->inquiry[56] & 0x01;
506 static inline int scsi_device_qas(struct scsi_device *sdev)
508 if (sdev->inquiry_len < 57)
510 return sdev->inquiry[56] & 0x02;
512 static inline int scsi_device_enclosure(struct scsi_device *sdev)
514 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
517 static inline int scsi_device_protection(struct scsi_device *sdev)
522 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
525 static inline int scsi_device_tpgs(struct scsi_device *sdev)
527 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
530 #define MODULE_ALIAS_SCSI_DEVICE(type) \
531 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
532 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
534 #endif /* _SCSI_SCSI_DEVICE_H */