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1 | #ifndef _SCSI_SCSI_DEVICE_H |
2 | #define _SCSI_SCSI_DEVICE_H |
3 | |
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 <scsi/scsi.h> |
10 | #include <asm/atomic.h> |
11 | |
12 | struct request_queue; |
13 | struct scsi_cmnd; |
14 | struct scsi_lun; |
15 | struct scsi_sense_hdr; |
16 | |
17 | struct scsi_mode_data { |
18 | __u32 length; |
19 | __u16 block_descriptor_length; |
20 | __u8 medium_type; |
21 | __u8 device_specific; |
22 | __u8 header_length; |
23 | __u8 longlba:1; |
24 | }; |
25 | |
26 | /* |
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(). |
30 | */ |
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 |
44 | * user request */ |
45 | SDEV_BLOCK, /* Device blocked by scsi lld. No |
46 | * scsi commands from user or midlayer |
47 | * should be issued to the scsi |
48 | * lld. */ |
49 | SDEV_CREATED_BLOCK, /* same as above but for created devices */ |
50 | }; |
51 | |
52 | enum scsi_device_event { |
53 | SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ |
54 | |
55 | SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE, |
56 | SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 |
57 | }; |
58 | |
59 | struct scsi_event { |
60 | enum scsi_device_event evt_type; |
61 | struct list_head node; |
62 | |
63 | /* put union of data structures, for non-simple event types, |
64 | * here |
65 | */ |
66 | }; |
67 | |
68 | struct scsi_device { |
69 | struct Scsi_Host *host; |
70 | struct request_queue *request_queue; |
71 | |
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 */ |
75 | |
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. */ |
79 | spinlock_t list_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) |
90 | |
91 | unsigned long last_queue_ramp_up; /* last queue ramp up time */ |
92 | |
93 | unsigned int id, lun, channel; |
94 | |
95 | unsigned int manufacturer; /* Manufacturer of device, for using |
96 | * vendor-specific cmd's */ |
97 | unsigned sector_size; /* size in bytes */ |
98 | |
99 | void *hostdata; /* available to low-level driver */ |
100 | char type; |
101 | char scsi_level; |
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 */ |
110 | |
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 |
114 | * core. */ |
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 |
132 | * this device */ |
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 is_visible:1; /* is the device visible in sysfs */ |
152 | |
153 | DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ |
154 | struct list_head event_list; /* asserted events */ |
155 | struct work_struct event_work; |
156 | |
157 | unsigned int device_blocked; /* Device returned QUEUE_FULL. */ |
158 | |
159 | unsigned int max_device_blocked; /* what device_blocked counts down from */ |
160 | #define SCSI_DEFAULT_DEVICE_BLOCKED 3 |
161 | |
162 | atomic_t iorequest_cnt; |
163 | atomic_t iodone_cnt; |
164 | atomic_t ioerr_cnt; |
165 | |
166 | struct device sdev_gendev, |
167 | sdev_dev; |
168 | |
169 | struct execute_work ew; /* used to get process context on put */ |
170 | |
171 | struct scsi_dh_data *scsi_dh_data; |
172 | enum scsi_device_state sdev_state; |
173 | unsigned long sdev_data[0]; |
174 | } __attribute__((aligned(sizeof(unsigned long)))); |
175 | |
176 | struct scsi_dh_devlist { |
177 | char *vendor; |
178 | char *model; |
179 | }; |
180 | |
181 | typedef void (*activate_complete)(void *, int); |
182 | struct scsi_device_handler { |
183 | /* Used by the infrastructure */ |
184 | struct list_head list; /* list of scsi_device_handlers */ |
185 | |
186 | /* Filled by the hardware handler */ |
187 | struct module *module; |
188 | const char *name; |
189 | const struct scsi_dh_devlist *devlist; |
190 | int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *); |
191 | int (*attach)(struct scsi_device *); |
192 | void (*detach)(struct scsi_device *); |
193 | int (*activate)(struct scsi_device *, activate_complete, void *); |
194 | int (*prep_fn)(struct scsi_device *, struct request *); |
195 | int (*set_params)(struct scsi_device *, const char *); |
196 | }; |
197 | |
198 | struct scsi_dh_data { |
199 | struct scsi_device_handler *scsi_dh; |
200 | struct scsi_device *sdev; |
201 | struct kref kref; |
202 | char buf[0]; |
203 | }; |
204 | |
205 | #define to_scsi_device(d) \ |
206 | container_of(d, struct scsi_device, sdev_gendev) |
207 | #define class_to_sdev(d) \ |
208 | container_of(d, struct scsi_device, sdev_dev) |
209 | #define transport_class_to_sdev(class_dev) \ |
210 | to_scsi_device(class_dev->parent) |
211 | |
212 | #define sdev_printk(prefix, sdev, fmt, a...) \ |
213 | dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a) |
214 | |
215 | #define scmd_printk(prefix, scmd, fmt, a...) \ |
216 | (scmd)->request->rq_disk ? \ |
217 | sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \ |
218 | (scmd)->request->rq_disk->disk_name, ##a) : \ |
219 | sdev_printk(prefix, (scmd)->device, fmt, ##a) |
220 | |
221 | enum scsi_target_state { |
222 | STARGET_CREATED = 1, |
223 | STARGET_RUNNING, |
224 | STARGET_DEL, |
225 | }; |
226 | |
227 | /* |
228 | * scsi_target: representation of a scsi target, for now, this is only |
229 | * used for single_lun devices. If no one has active IO to the target, |
230 | * starget_sdev_user is NULL, else it points to the active sdev. |
231 | */ |
232 | struct scsi_target { |
233 | struct scsi_device *starget_sdev_user; |
234 | struct list_head siblings; |
235 | struct list_head devices; |
236 | struct device dev; |
237 | unsigned int reap_ref; /* protected by the host lock */ |
238 | unsigned int channel; |
239 | unsigned int id; /* target id ... replace |
240 | * scsi_device.id eventually */ |
241 | unsigned int create:1; /* signal that it needs to be added */ |
242 | unsigned int single_lun:1; /* Indicates we should only |
243 | * allow I/O to one of the luns |
244 | * for the device at a time. */ |
245 | unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */ |
246 | /* means no lun present */ |
247 | /* commands actually active on LLD. protected by host lock. */ |
248 | unsigned int target_busy; |
249 | /* |
250 | * LLDs should set this in the slave_alloc host template callout. |
251 | * If set to zero then there is not limit. |
252 | */ |
253 | unsigned int can_queue; |
254 | unsigned int target_blocked; |
255 | unsigned int max_target_blocked; |
256 | #define SCSI_DEFAULT_TARGET_BLOCKED 3 |
257 | |
258 | char scsi_level; |
259 | struct execute_work ew; |
260 | enum scsi_target_state state; |
261 | void *hostdata; /* available to low-level driver */ |
262 | unsigned long starget_data[0]; /* for the transport */ |
263 | /* starget_data must be the last element!!!! */ |
264 | } __attribute__((aligned(sizeof(unsigned long)))); |
265 | |
266 | #define to_scsi_target(d) container_of(d, struct scsi_target, dev) |
267 | static inline struct scsi_target *scsi_target(struct scsi_device *sdev) |
268 | { |
269 | return to_scsi_target(sdev->sdev_gendev.parent); |
270 | } |
271 | #define transport_class_to_starget(class_dev) \ |
272 | to_scsi_target(class_dev->parent) |
273 | |
274 | #define starget_printk(prefix, starget, fmt, a...) \ |
275 | dev_printk(prefix, &(starget)->dev, fmt, ##a) |
276 | |
277 | extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, |
278 | uint, uint, uint, void *hostdata); |
279 | extern int scsi_add_device(struct Scsi_Host *host, uint channel, |
280 | uint target, uint lun); |
281 | extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); |
282 | extern void scsi_remove_device(struct scsi_device *); |
283 | extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); |
284 | |
285 | extern int scsi_device_get(struct scsi_device *); |
286 | extern void scsi_device_put(struct scsi_device *); |
287 | extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, |
288 | uint, uint, uint); |
289 | extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, |
290 | uint, uint, uint); |
291 | extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, |
292 | uint); |
293 | extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, |
294 | uint); |
295 | extern void starget_for_each_device(struct scsi_target *, void *, |
296 | void (*fn)(struct scsi_device *, void *)); |
297 | extern void __starget_for_each_device(struct scsi_target *, void *, |
298 | void (*fn)(struct scsi_device *, |
299 | void *)); |
300 | |
301 | /* only exposed to implement shost_for_each_device */ |
302 | extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, |
303 | struct scsi_device *); |
304 | |
305 | /** |
306 | * shost_for_each_device - iterate over all devices of a host |
307 | * @sdev: the &struct scsi_device to use as a cursor |
308 | * @shost: the &struct scsi_host to iterate over |
309 | * |
310 | * Iterator that returns each device attached to @shost. This loop |
311 | * takes a reference on each device and releases it at the end. If |
312 | * you break out of the loop, you must call scsi_device_put(sdev). |
313 | */ |
314 | #define shost_for_each_device(sdev, shost) \ |
315 | for ((sdev) = __scsi_iterate_devices((shost), NULL); \ |
316 | (sdev); \ |
317 | (sdev) = __scsi_iterate_devices((shost), (sdev))) |
318 | |
319 | /** |
320 | * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) |
321 | * @sdev: the &struct scsi_device to use as a cursor |
322 | * @shost: the &struct scsi_host to iterate over |
323 | * |
324 | * Iterator that returns each device attached to @shost. It does _not_ |
325 | * take a reference on the scsi_device, so the whole loop must be |
326 | * protected by shost->host_lock. |
327 | * |
328 | * Note: The only reason to use this is because you need to access the |
329 | * device list in interrupt context. Otherwise you really want to use |
330 | * shost_for_each_device instead. |
331 | */ |
332 | #define __shost_for_each_device(sdev, shost) \ |
333 | list_for_each_entry((sdev), &((shost)->__devices), siblings) |
334 | |
335 | extern void scsi_adjust_queue_depth(struct scsi_device *, int, int); |
336 | extern int scsi_track_queue_full(struct scsi_device *, int); |
337 | |
338 | extern int scsi_set_medium_removal(struct scsi_device *, char); |
339 | |
340 | extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, |
341 | unsigned char *buffer, int len, int timeout, |
342 | int retries, struct scsi_mode_data *data, |
343 | struct scsi_sense_hdr *); |
344 | extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, |
345 | int modepage, unsigned char *buffer, int len, |
346 | int timeout, int retries, |
347 | struct scsi_mode_data *data, |
348 | struct scsi_sense_hdr *); |
349 | extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, |
350 | int retries, struct scsi_sense_hdr *sshdr); |
351 | extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, |
352 | int buf_len); |
353 | extern int scsi_device_set_state(struct scsi_device *sdev, |
354 | enum scsi_device_state state); |
355 | extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, |
356 | gfp_t gfpflags); |
357 | extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); |
358 | extern void sdev_evt_send_simple(struct scsi_device *sdev, |
359 | enum scsi_device_event evt_type, gfp_t gfpflags); |
360 | extern int scsi_device_quiesce(struct scsi_device *sdev); |
361 | extern void scsi_device_resume(struct scsi_device *sdev); |
362 | extern void scsi_target_quiesce(struct scsi_target *); |
363 | extern void scsi_target_resume(struct scsi_target *); |
364 | extern void scsi_scan_target(struct device *parent, unsigned int channel, |
365 | unsigned int id, unsigned int lun, int rescan); |
366 | extern void scsi_target_reap(struct scsi_target *); |
367 | extern void scsi_target_block(struct device *); |
368 | extern void scsi_target_unblock(struct device *); |
369 | extern void scsi_remove_target(struct device *); |
370 | extern void int_to_scsilun(unsigned int, struct scsi_lun *); |
371 | extern int scsilun_to_int(struct scsi_lun *); |
372 | extern const char *scsi_device_state_name(enum scsi_device_state); |
373 | extern int scsi_is_sdev_device(const struct device *); |
374 | extern int scsi_is_target_device(const struct device *); |
375 | extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, |
376 | int data_direction, void *buffer, unsigned bufflen, |
377 | unsigned char *sense, int timeout, int retries, |
378 | int flag, int *resid); |
379 | extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd, |
380 | int data_direction, void *buffer, unsigned bufflen, |
381 | struct scsi_sense_hdr *, int timeout, int retries, |
382 | int *resid); |
383 | |
384 | static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) |
385 | { |
386 | return device_reprobe(&sdev->sdev_gendev); |
387 | } |
388 | |
389 | static inline unsigned int sdev_channel(struct scsi_device *sdev) |
390 | { |
391 | return sdev->channel; |
392 | } |
393 | |
394 | static inline unsigned int sdev_id(struct scsi_device *sdev) |
395 | { |
396 | return sdev->id; |
397 | } |
398 | |
399 | #define scmd_id(scmd) sdev_id((scmd)->device) |
400 | #define scmd_channel(scmd) sdev_channel((scmd)->device) |
401 | |
402 | /* |
403 | * checks for positions of the SCSI state machine |
404 | */ |
405 | static inline int scsi_device_online(struct scsi_device *sdev) |
406 | { |
407 | return (sdev->sdev_state != SDEV_OFFLINE && |
408 | sdev->sdev_state != SDEV_DEL); |
409 | } |
410 | static inline int scsi_device_blocked(struct scsi_device *sdev) |
411 | { |
412 | return sdev->sdev_state == SDEV_BLOCK || |
413 | sdev->sdev_state == SDEV_CREATED_BLOCK; |
414 | } |
415 | static inline int scsi_device_created(struct scsi_device *sdev) |
416 | { |
417 | return sdev->sdev_state == SDEV_CREATED || |
418 | sdev->sdev_state == SDEV_CREATED_BLOCK; |
419 | } |
420 | |
421 | /* accessor functions for the SCSI parameters */ |
422 | static inline int scsi_device_sync(struct scsi_device *sdev) |
423 | { |
424 | return sdev->sdtr; |
425 | } |
426 | static inline int scsi_device_wide(struct scsi_device *sdev) |
427 | { |
428 | return sdev->wdtr; |
429 | } |
430 | static inline int scsi_device_dt(struct scsi_device *sdev) |
431 | { |
432 | return sdev->ppr; |
433 | } |
434 | static inline int scsi_device_dt_only(struct scsi_device *sdev) |
435 | { |
436 | if (sdev->inquiry_len < 57) |
437 | return 0; |
438 | return (sdev->inquiry[56] & 0x0c) == 0x04; |
439 | } |
440 | static inline int scsi_device_ius(struct scsi_device *sdev) |
441 | { |
442 | if (sdev->inquiry_len < 57) |
443 | return 0; |
444 | return sdev->inquiry[56] & 0x01; |
445 | } |
446 | static inline int scsi_device_qas(struct scsi_device *sdev) |
447 | { |
448 | if (sdev->inquiry_len < 57) |
449 | return 0; |
450 | return sdev->inquiry[56] & 0x02; |
451 | } |
452 | static inline int scsi_device_enclosure(struct scsi_device *sdev) |
453 | { |
454 | return sdev->inquiry[6] & (1<<6); |
455 | } |
456 | |
457 | static inline int scsi_device_protection(struct scsi_device *sdev) |
458 | { |
459 | return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); |
460 | } |
461 | |
462 | #define MODULE_ALIAS_SCSI_DEVICE(type) \ |
463 | MODULE_ALIAS("scsi:t-" __stringify(type) "*") |
464 | #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" |
465 | |
466 | #endif /* _SCSI_SCSI_DEVICE_H */ |
467 |
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