Loading...
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 <linux/atomic.h>
11
12struct request_queue;
13struct scsi_cmnd;
14struct scsi_lun;
15struct scsi_sense_hdr;
16
17struct 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 */
31enum 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
52enum 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
59struct 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
68struct 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 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 */
154
155 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
156 struct list_head event_list; /* asserted events */
157 struct work_struct event_work;
158
159 unsigned int device_blocked; /* Device returned QUEUE_FULL. */
160
161 unsigned int max_device_blocked; /* what device_blocked counts down from */
162#define SCSI_DEFAULT_DEVICE_BLOCKED 3
163
164 atomic_t iorequest_cnt;
165 atomic_t iodone_cnt;
166 atomic_t ioerr_cnt;
167
168 struct device sdev_gendev,
169 sdev_dev;
170
171 struct execute_work ew; /* used to get process context on put */
172 struct work_struct requeue_work;
173
174 struct scsi_dh_data *scsi_dh_data;
175 enum scsi_device_state sdev_state;
176 unsigned long sdev_data[0];
177} __attribute__((aligned(sizeof(unsigned long))));
178
179struct scsi_dh_devlist {
180 char *vendor;
181 char *model;
182};
183
184typedef void (*activate_complete)(void *, int);
185struct scsi_device_handler {
186 /* Used by the infrastructure */
187 struct list_head list; /* list of scsi_device_handlers */
188 int idx;
189
190 /* Filled by the hardware handler */
191 struct module *module;
192 const char *name;
193 const struct scsi_dh_devlist *devlist;
194 int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
195 int (*attach)(struct scsi_device *);
196 void (*detach)(struct scsi_device *);
197 int (*activate)(struct scsi_device *, activate_complete, void *);
198 int (*prep_fn)(struct scsi_device *, struct request *);
199 int (*set_params)(struct scsi_device *, const char *);
200};
201
202struct scsi_dh_data {
203 struct scsi_device_handler *scsi_dh;
204 struct scsi_device *sdev;
205 struct kref kref;
206 char buf[0];
207};
208
209#define to_scsi_device(d) \
210 container_of(d, struct scsi_device, sdev_gendev)
211#define class_to_sdev(d) \
212 container_of(d, struct scsi_device, sdev_dev)
213#define transport_class_to_sdev(class_dev) \
214 to_scsi_device(class_dev->parent)
215
216#define sdev_printk(prefix, sdev, fmt, a...) \
217 dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
218
219#define scmd_printk(prefix, scmd, fmt, a...) \
220 (scmd)->request->rq_disk ? \
221 sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
222 (scmd)->request->rq_disk->disk_name, ##a) : \
223 sdev_printk(prefix, (scmd)->device, fmt, ##a)
224
225enum scsi_target_state {
226 STARGET_CREATED = 1,
227 STARGET_RUNNING,
228 STARGET_DEL,
229};
230
231/*
232 * scsi_target: representation of a scsi target, for now, this is only
233 * used for single_lun devices. If no one has active IO to the target,
234 * starget_sdev_user is NULL, else it points to the active sdev.
235 */
236struct scsi_target {
237 struct scsi_device *starget_sdev_user;
238 struct list_head siblings;
239 struct list_head devices;
240 struct device dev;
241 unsigned int reap_ref; /* protected by the host lock */
242 unsigned int channel;
243 unsigned int id; /* target id ... replace
244 * scsi_device.id eventually */
245 unsigned int create:1; /* signal that it needs to be added */
246 unsigned int single_lun:1; /* Indicates we should only
247 * allow I/O to one of the luns
248 * for the device at a time. */
249 unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */
250 /* means no lun present */
251 /* commands actually active on LLD. protected by host lock. */
252 unsigned int target_busy;
253 /*
254 * LLDs should set this in the slave_alloc host template callout.
255 * If set to zero then there is not limit.
256 */
257 unsigned int can_queue;
258 unsigned int target_blocked;
259 unsigned int max_target_blocked;
260#define SCSI_DEFAULT_TARGET_BLOCKED 3
261
262 char scsi_level;
263 struct execute_work ew;
264 enum scsi_target_state state;
265 void *hostdata; /* available to low-level driver */
266 unsigned long starget_data[0]; /* for the transport */
267 /* starget_data must be the last element!!!! */
268} __attribute__((aligned(sizeof(unsigned long))));
269
270#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
271static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
272{
273 return to_scsi_target(sdev->sdev_gendev.parent);
274}
275#define transport_class_to_starget(class_dev) \
276 to_scsi_target(class_dev->parent)
277
278#define starget_printk(prefix, starget, fmt, a...) \
279 dev_printk(prefix, &(starget)->dev, fmt, ##a)
280
281extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
282 uint, uint, uint, void *hostdata);
283extern int scsi_add_device(struct Scsi_Host *host, uint channel,
284 uint target, uint lun);
285extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
286extern void scsi_remove_device(struct scsi_device *);
287extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
288
289extern int scsi_device_get(struct scsi_device *);
290extern void scsi_device_put(struct scsi_device *);
291extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
292 uint, uint, uint);
293extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
294 uint, uint, uint);
295extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
296 uint);
297extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
298 uint);
299extern void starget_for_each_device(struct scsi_target *, void *,
300 void (*fn)(struct scsi_device *, void *));
301extern void __starget_for_each_device(struct scsi_target *, void *,
302 void (*fn)(struct scsi_device *,
303 void *));
304
305/* only exposed to implement shost_for_each_device */
306extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
307 struct scsi_device *);
308
309/**
310 * shost_for_each_device - iterate over all devices of a host
311 * @sdev: the &struct scsi_device to use as a cursor
312 * @shost: the &struct scsi_host to iterate over
313 *
314 * Iterator that returns each device attached to @shost. This loop
315 * takes a reference on each device and releases it at the end. If
316 * you break out of the loop, you must call scsi_device_put(sdev).
317 */
318#define shost_for_each_device(sdev, shost) \
319 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
320 (sdev); \
321 (sdev) = __scsi_iterate_devices((shost), (sdev)))
322
323/**
324 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
325 * @sdev: the &struct scsi_device to use as a cursor
326 * @shost: the &struct scsi_host to iterate over
327 *
328 * Iterator that returns each device attached to @shost. It does _not_
329 * take a reference on the scsi_device, so the whole loop must be
330 * protected by shost->host_lock.
331 *
332 * Note: The only reason to use this is because you need to access the
333 * device list in interrupt context. Otherwise you really want to use
334 * shost_for_each_device instead.
335 */
336#define __shost_for_each_device(sdev, shost) \
337 list_for_each_entry((sdev), &((shost)->__devices), siblings)
338
339extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
340extern int scsi_track_queue_full(struct scsi_device *, int);
341
342extern int scsi_set_medium_removal(struct scsi_device *, char);
343
344extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
345 unsigned char *buffer, int len, int timeout,
346 int retries, struct scsi_mode_data *data,
347 struct scsi_sense_hdr *);
348extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
349 int modepage, unsigned char *buffer, int len,
350 int timeout, int retries,
351 struct scsi_mode_data *data,
352 struct scsi_sense_hdr *);
353extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
354 int retries, struct scsi_sense_hdr *sshdr);
355extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
356 int buf_len);
357extern int scsi_device_set_state(struct scsi_device *sdev,
358 enum scsi_device_state state);
359extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
360 gfp_t gfpflags);
361extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
362extern void sdev_evt_send_simple(struct scsi_device *sdev,
363 enum scsi_device_event evt_type, gfp_t gfpflags);
364extern int scsi_device_quiesce(struct scsi_device *sdev);
365extern void scsi_device_resume(struct scsi_device *sdev);
366extern void scsi_target_quiesce(struct scsi_target *);
367extern void scsi_target_resume(struct scsi_target *);
368extern void scsi_scan_target(struct device *parent, unsigned int channel,
369 unsigned int id, unsigned int lun, int rescan);
370extern void scsi_target_reap(struct scsi_target *);
371extern void scsi_target_block(struct device *);
372extern void scsi_target_unblock(struct device *);
373extern void scsi_remove_target(struct device *);
374extern void int_to_scsilun(unsigned int, struct scsi_lun *);
375extern int scsilun_to_int(struct scsi_lun *);
376extern const char *scsi_device_state_name(enum scsi_device_state);
377extern int scsi_is_sdev_device(const struct device *);
378extern int scsi_is_target_device(const struct device *);
379extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
380 int data_direction, void *buffer, unsigned bufflen,
381 unsigned char *sense, int timeout, int retries,
382 int flag, int *resid);
383extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
384 int data_direction, void *buffer, unsigned bufflen,
385 struct scsi_sense_hdr *, int timeout, int retries,
386 int *resid);
387
388#ifdef CONFIG_PM_RUNTIME
389extern int scsi_autopm_get_device(struct scsi_device *);
390extern void scsi_autopm_put_device(struct scsi_device *);
391#else
392static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
393static inline void scsi_autopm_put_device(struct scsi_device *d) {}
394#endif /* CONFIG_PM_RUNTIME */
395
396static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
397{
398 return device_reprobe(&sdev->sdev_gendev);
399}
400
401static inline unsigned int sdev_channel(struct scsi_device *sdev)
402{
403 return sdev->channel;
404}
405
406static inline unsigned int sdev_id(struct scsi_device *sdev)
407{
408 return sdev->id;
409}
410
411#define scmd_id(scmd) sdev_id((scmd)->device)
412#define scmd_channel(scmd) sdev_channel((scmd)->device)
413
414/*
415 * checks for positions of the SCSI state machine
416 */
417static inline int scsi_device_online(struct scsi_device *sdev)
418{
419 return (sdev->sdev_state != SDEV_OFFLINE &&
420 sdev->sdev_state != SDEV_DEL);
421}
422static inline int scsi_device_blocked(struct scsi_device *sdev)
423{
424 return sdev->sdev_state == SDEV_BLOCK ||
425 sdev->sdev_state == SDEV_CREATED_BLOCK;
426}
427static inline int scsi_device_created(struct scsi_device *sdev)
428{
429 return sdev->sdev_state == SDEV_CREATED ||
430 sdev->sdev_state == SDEV_CREATED_BLOCK;
431}
432
433/* accessor functions for the SCSI parameters */
434static inline int scsi_device_sync(struct scsi_device *sdev)
435{
436 return sdev->sdtr;
437}
438static inline int scsi_device_wide(struct scsi_device *sdev)
439{
440 return sdev->wdtr;
441}
442static inline int scsi_device_dt(struct scsi_device *sdev)
443{
444 return sdev->ppr;
445}
446static inline int scsi_device_dt_only(struct scsi_device *sdev)
447{
448 if (sdev->inquiry_len < 57)
449 return 0;
450 return (sdev->inquiry[56] & 0x0c) == 0x04;
451}
452static inline int scsi_device_ius(struct scsi_device *sdev)
453{
454 if (sdev->inquiry_len < 57)
455 return 0;
456 return sdev->inquiry[56] & 0x01;
457}
458static inline int scsi_device_qas(struct scsi_device *sdev)
459{
460 if (sdev->inquiry_len < 57)
461 return 0;
462 return sdev->inquiry[56] & 0x02;
463}
464static inline int scsi_device_enclosure(struct scsi_device *sdev)
465{
466 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
467}
468
469static inline int scsi_device_protection(struct scsi_device *sdev)
470{
471 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
472}
473
474#define MODULE_ALIAS_SCSI_DEVICE(type) \
475 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
476#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
477
478#endif /* _SCSI_SCSI_DEVICE_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _SCSI_SCSI_DEVICE_H
3#define _SCSI_SCSI_DEVICE_H
4
5#include <linux/list.h>
6#include <linux/spinlock.h>
7#include <linux/workqueue.h>
8#include <linux/blk-mq.h>
9#include <scsi/scsi.h>
10#include <linux/atomic.h>
11#include <linux/sbitmap.h>
12
13struct bsg_device;
14struct device;
15struct request_queue;
16struct scsi_cmnd;
17struct scsi_lun;
18struct scsi_sense_hdr;
19
20typedef __u64 __bitwise blist_flags_t;
21
22#define SCSI_SENSE_BUFFERSIZE 96
23
24struct scsi_mode_data {
25 __u32 length;
26 __u16 block_descriptor_length;
27 __u8 medium_type;
28 __u8 device_specific;
29 __u8 header_length;
30 __u8 longlba:1;
31};
32
33/*
34 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
35 * (for the ascii descriptions) and the state model enforcer:
36 * scsi_lib:scsi_device_set_state().
37 */
38enum scsi_device_state {
39 SDEV_CREATED = 1, /* device created but not added to sysfs
40 * Only internal commands allowed (for inq) */
41 SDEV_RUNNING, /* device properly configured
42 * All commands allowed */
43 SDEV_CANCEL, /* beginning to delete device
44 * Only error handler commands allowed */
45 SDEV_DEL, /* device deleted
46 * no commands allowed */
47 SDEV_QUIESCE, /* Device quiescent. No block commands
48 * will be accepted, only specials (which
49 * originate in the mid-layer) */
50 SDEV_OFFLINE, /* Device offlined (by error handling or
51 * user request */
52 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
53 SDEV_BLOCK, /* Device blocked by scsi lld. No
54 * scsi commands from user or midlayer
55 * should be issued to the scsi
56 * lld. */
57 SDEV_CREATED_BLOCK, /* same as above but for created devices */
58};
59
60enum scsi_scan_mode {
61 SCSI_SCAN_INITIAL = 0,
62 SCSI_SCAN_RESCAN,
63 SCSI_SCAN_MANUAL,
64};
65
66enum scsi_device_event {
67 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
68 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
69 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
70 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
71 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
72 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
73 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
74 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */
75
76 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
77 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED,
78
79 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
80};
81
82struct scsi_event {
83 enum scsi_device_event evt_type;
84 struct list_head node;
85
86 /* put union of data structures, for non-simple event types,
87 * here
88 */
89};
90
91/**
92 * struct scsi_vpd - SCSI Vital Product Data
93 * @rcu: For kfree_rcu().
94 * @len: Length in bytes of @data.
95 * @data: VPD data as defined in various T10 SCSI standard documents.
96 */
97struct scsi_vpd {
98 struct rcu_head rcu;
99 int len;
100 unsigned char data[];
101};
102
103struct scsi_device {
104 struct Scsi_Host *host;
105 struct request_queue *request_queue;
106
107 /* the next two are protected by the host->host_lock */
108 struct list_head siblings; /* list of all devices on this host */
109 struct list_head same_target_siblings; /* just the devices sharing same target id */
110
111 struct sbitmap budget_map;
112 atomic_t device_blocked; /* Device returned QUEUE_FULL. */
113
114 atomic_t restarts;
115 spinlock_t list_lock;
116 struct list_head starved_entry;
117 unsigned short queue_depth; /* How deep of a queue we want */
118 unsigned short max_queue_depth; /* max queue depth */
119 unsigned short last_queue_full_depth; /* These two are used by */
120 unsigned short last_queue_full_count; /* scsi_track_queue_full() */
121 unsigned long last_queue_full_time; /* last queue full time */
122 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
123#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
124
125 unsigned long last_queue_ramp_up; /* last queue ramp up time */
126
127 unsigned int id, channel;
128 u64 lun;
129 unsigned int manufacturer; /* Manufacturer of device, for using
130 * vendor-specific cmd's */
131 unsigned sector_size; /* size in bytes */
132
133 void *hostdata; /* available to low-level driver */
134 unsigned char type;
135 char scsi_level;
136 char inq_periph_qual; /* PQ from INQUIRY data */
137 struct mutex inquiry_mutex;
138 unsigned char inquiry_len; /* valid bytes in 'inquiry' */
139 unsigned char * inquiry; /* INQUIRY response data */
140 const char * vendor; /* [back_compat] point into 'inquiry' ... */
141 const char * model; /* ... after scan; point to static string */
142 const char * rev; /* ... "nullnullnullnull" before scan */
143
144#define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */
145 struct scsi_vpd __rcu *vpd_pg0;
146 struct scsi_vpd __rcu *vpd_pg83;
147 struct scsi_vpd __rcu *vpd_pg80;
148 struct scsi_vpd __rcu *vpd_pg89;
149 struct scsi_vpd __rcu *vpd_pgb0;
150 struct scsi_vpd __rcu *vpd_pgb1;
151 struct scsi_vpd __rcu *vpd_pgb2;
152
153 struct scsi_target *sdev_target;
154
155 blist_flags_t sdev_bflags; /* black/white flags as also found in
156 * scsi_devinfo.[hc]. For now used only to
157 * pass settings from slave_alloc to scsi
158 * core. */
159 unsigned int eh_timeout; /* Error handling timeout */
160
161 /*
162 * If true, let the high-level device driver (sd) manage the device
163 * power state for system suspend/resume (suspend to RAM and
164 * hibernation) operations.
165 */
166 unsigned manage_system_start_stop:1;
167
168 /*
169 * If true, let the high-level device driver (sd) manage the device
170 * power state for runtime device suspand and resume operations.
171 */
172 unsigned manage_runtime_start_stop:1;
173
174 /*
175 * If true, let the high-level device driver (sd) manage the device
176 * power state for system shutdown (power off) operations.
177 */
178 unsigned manage_shutdown:1;
179
180 /*
181 * If set and if the device is runtime suspended, ask the high-level
182 * device driver (sd) to force a runtime resume of the device.
183 */
184 unsigned force_runtime_start_on_system_start:1;
185
186 unsigned removable:1;
187 unsigned changed:1; /* Data invalid due to media change */
188 unsigned busy:1; /* Used to prevent races */
189 unsigned lockable:1; /* Able to prevent media removal */
190 unsigned locked:1; /* Media removal disabled */
191 unsigned borken:1; /* Tell the Seagate driver to be
192 * painfully slow on this device */
193 unsigned disconnect:1; /* can disconnect */
194 unsigned soft_reset:1; /* Uses soft reset option */
195 unsigned sdtr:1; /* Device supports SDTR messages */
196 unsigned wdtr:1; /* Device supports WDTR messages */
197 unsigned ppr:1; /* Device supports PPR messages */
198 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
199 unsigned simple_tags:1; /* simple queue tag messages are enabled */
200 unsigned was_reset:1; /* There was a bus reset on the bus for
201 * this device */
202 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
203 * because we did a bus reset. */
204 unsigned use_10_for_rw:1; /* first try 10-byte read / write */
205 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
206 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
207 unsigned read_before_ms:1; /* perform a READ before MODE SENSE */
208 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
209 unsigned no_write_same:1; /* no WRITE SAME command */
210 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
211 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */
212 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
213 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
214 unsigned skip_vpd_pages:1; /* do not read VPD pages */
215 unsigned try_vpd_pages:1; /* attempt to read VPD pages */
216 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
217 unsigned no_start_on_add:1; /* do not issue start on add */
218 unsigned allow_restart:1; /* issue START_UNIT in error handler */
219 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
220 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
221 unsigned select_no_atn:1;
222 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
223 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
224 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
225 unsigned last_sector_bug:1; /* do not use multisector accesses on
226 SD_LAST_BUGGY_SECTORS */
227 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
228 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
229 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
230 unsigned security_supported:1; /* Supports Security Protocols */
231 unsigned is_visible:1; /* is the device visible in sysfs */
232 unsigned wce_default_on:1; /* Cache is ON by default */
233 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
234 unsigned broken_fua:1; /* Don't set FUA bit */
235 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
236 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
237 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
238 * creation time */
239 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
240 unsigned silence_suspend:1; /* Do not print runtime PM related messages */
241 unsigned no_vpd_size:1; /* No VPD size reported in header */
242
243 unsigned cdl_supported:1; /* Command duration limits supported */
244 unsigned cdl_enable:1; /* Enable/disable Command duration limits */
245
246 unsigned int queue_stopped; /* request queue is quiesced */
247 bool offline_already; /* Device offline message logged */
248
249 atomic_t disk_events_disable_depth; /* disable depth for disk events */
250
251 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
252 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
253 struct list_head event_list; /* asserted events */
254 struct work_struct event_work;
255
256 unsigned int max_device_blocked; /* what device_blocked counts down from */
257#define SCSI_DEFAULT_DEVICE_BLOCKED 3
258
259 atomic_t iorequest_cnt;
260 atomic_t iodone_cnt;
261 atomic_t ioerr_cnt;
262 atomic_t iotmo_cnt;
263
264 struct device sdev_gendev,
265 sdev_dev;
266
267 struct work_struct requeue_work;
268
269 struct scsi_device_handler *handler;
270 void *handler_data;
271
272 size_t dma_drain_len;
273 void *dma_drain_buf;
274
275 unsigned int sg_timeout;
276 unsigned int sg_reserved_size;
277
278 struct bsg_device *bsg_dev;
279 unsigned char access_state;
280 struct mutex state_mutex;
281 enum scsi_device_state sdev_state;
282 struct task_struct *quiesced_by;
283 unsigned long sdev_data[];
284} __attribute__((aligned(sizeof(unsigned long))));
285
286#define to_scsi_device(d) \
287 container_of(d, struct scsi_device, sdev_gendev)
288#define class_to_sdev(d) \
289 container_of(d, struct scsi_device, sdev_dev)
290#define transport_class_to_sdev(class_dev) \
291 to_scsi_device(class_dev->parent)
292
293#define sdev_dbg(sdev, fmt, a...) \
294 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
295
296/*
297 * like scmd_printk, but the device name is passed in
298 * as a string pointer
299 */
300__printf(4, 5) void
301sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
302 const char *, ...);
303
304#define sdev_printk(l, sdev, fmt, a...) \
305 sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
306
307__printf(3, 4) void
308scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
309
310#define scmd_dbg(scmd, fmt, a...) \
311 do { \
312 struct request *__rq = scsi_cmd_to_rq((scmd)); \
313 \
314 if (__rq->q->disk) \
315 sdev_dbg((scmd)->device, "[%s] " fmt, \
316 __rq->q->disk->disk_name, ##a); \
317 else \
318 sdev_dbg((scmd)->device, fmt, ##a); \
319 } while (0)
320
321enum scsi_target_state {
322 STARGET_CREATED = 1,
323 STARGET_RUNNING,
324 STARGET_REMOVE,
325 STARGET_CREATED_REMOVE,
326 STARGET_DEL,
327};
328
329/*
330 * scsi_target: representation of a scsi target, for now, this is only
331 * used for single_lun devices. If no one has active IO to the target,
332 * starget_sdev_user is NULL, else it points to the active sdev.
333 */
334struct scsi_target {
335 struct scsi_device *starget_sdev_user;
336 struct list_head siblings;
337 struct list_head devices;
338 struct device dev;
339 struct kref reap_ref; /* last put renders target invisible */
340 unsigned int channel;
341 unsigned int id; /* target id ... replace
342 * scsi_device.id eventually */
343 unsigned int create:1; /* signal that it needs to be added */
344 unsigned int single_lun:1; /* Indicates we should only
345 * allow I/O to one of the luns
346 * for the device at a time. */
347 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
348 * means no lun present. */
349 unsigned int no_report_luns:1; /* Don't use
350 * REPORT LUNS for scanning. */
351 unsigned int expecting_lun_change:1; /* A device has reported
352 * a 3F/0E UA, other devices on
353 * the same target will also. */
354 /* commands actually active on LLD. */
355 atomic_t target_busy;
356 atomic_t target_blocked;
357
358 /*
359 * LLDs should set this in the slave_alloc host template callout.
360 * If set to zero then there is not limit.
361 */
362 unsigned int can_queue;
363 unsigned int max_target_blocked;
364#define SCSI_DEFAULT_TARGET_BLOCKED 3
365
366 char scsi_level;
367 enum scsi_target_state state;
368 void *hostdata; /* available to low-level driver */
369 unsigned long starget_data[]; /* for the transport */
370 /* starget_data must be the last element!!!! */
371} __attribute__((aligned(sizeof(unsigned long))));
372
373#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
374static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
375{
376 return to_scsi_target(sdev->sdev_gendev.parent);
377}
378#define transport_class_to_starget(class_dev) \
379 to_scsi_target(class_dev->parent)
380
381#define starget_printk(prefix, starget, fmt, a...) \
382 dev_printk(prefix, &(starget)->dev, fmt, ##a)
383
384extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
385 uint, uint, u64, void *hostdata);
386extern int scsi_add_device(struct Scsi_Host *host, uint channel,
387 uint target, u64 lun);
388extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
389extern void scsi_remove_device(struct scsi_device *);
390extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
391void scsi_attach_vpd(struct scsi_device *sdev);
392void scsi_cdl_check(struct scsi_device *sdev);
393int scsi_cdl_enable(struct scsi_device *sdev, bool enable);
394
395extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
396extern int __must_check scsi_device_get(struct scsi_device *);
397extern void scsi_device_put(struct scsi_device *);
398extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
399 uint, uint, u64);
400extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
401 uint, uint, u64);
402extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
403 u64);
404extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
405 u64);
406extern void starget_for_each_device(struct scsi_target *, void *,
407 void (*fn)(struct scsi_device *, void *));
408extern void __starget_for_each_device(struct scsi_target *, void *,
409 void (*fn)(struct scsi_device *,
410 void *));
411
412/* only exposed to implement shost_for_each_device */
413extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
414 struct scsi_device *);
415
416/**
417 * shost_for_each_device - iterate over all devices of a host
418 * @sdev: the &struct scsi_device to use as a cursor
419 * @shost: the &struct scsi_host to iterate over
420 *
421 * Iterator that returns each device attached to @shost. This loop
422 * takes a reference on each device and releases it at the end. If
423 * you break out of the loop, you must call scsi_device_put(sdev).
424 */
425#define shost_for_each_device(sdev, shost) \
426 for ((sdev) = __scsi_iterate_devices((shost), NULL); \
427 (sdev); \
428 (sdev) = __scsi_iterate_devices((shost), (sdev)))
429
430/**
431 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
432 * @sdev: the &struct scsi_device to use as a cursor
433 * @shost: the &struct scsi_host to iterate over
434 *
435 * Iterator that returns each device attached to @shost. It does _not_
436 * take a reference on the scsi_device, so the whole loop must be
437 * protected by shost->host_lock.
438 *
439 * Note: The only reason to use this is because you need to access the
440 * device list in interrupt context. Otherwise you really want to use
441 * shost_for_each_device instead.
442 */
443#define __shost_for_each_device(sdev, shost) \
444 list_for_each_entry((sdev), &((shost)->__devices), siblings)
445
446extern int scsi_change_queue_depth(struct scsi_device *, int);
447extern int scsi_track_queue_full(struct scsi_device *, int);
448
449extern int scsi_set_medium_removal(struct scsi_device *, char);
450
451int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
452 int subpage, unsigned char *buffer, int len, int timeout,
453 int retries, struct scsi_mode_data *data,
454 struct scsi_sense_hdr *);
455extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
456 unsigned char *buffer, int len, int timeout,
457 int retries, struct scsi_mode_data *data,
458 struct scsi_sense_hdr *);
459extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
460 int retries, struct scsi_sense_hdr *sshdr);
461extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
462 int buf_len);
463int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
464 unsigned int len, unsigned char opcode,
465 unsigned short sa);
466extern int scsi_device_set_state(struct scsi_device *sdev,
467 enum scsi_device_state state);
468extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
469 gfp_t gfpflags);
470extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
471extern void sdev_evt_send_simple(struct scsi_device *sdev,
472 enum scsi_device_event evt_type, gfp_t gfpflags);
473extern int scsi_device_quiesce(struct scsi_device *sdev);
474extern void scsi_device_resume(struct scsi_device *sdev);
475extern void scsi_target_quiesce(struct scsi_target *);
476extern void scsi_target_resume(struct scsi_target *);
477extern void scsi_scan_target(struct device *parent, unsigned int channel,
478 unsigned int id, u64 lun,
479 enum scsi_scan_mode rescan);
480extern void scsi_target_reap(struct scsi_target *);
481void scsi_block_targets(struct Scsi_Host *shost, struct device *dev);
482extern void scsi_target_unblock(struct device *, enum scsi_device_state);
483extern void scsi_remove_target(struct device *);
484extern const char *scsi_device_state_name(enum scsi_device_state);
485extern int scsi_is_sdev_device(const struct device *);
486extern int scsi_is_target_device(const struct device *);
487extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
488
489/* Optional arguments to scsi_execute_cmd */
490struct scsi_exec_args {
491 unsigned char *sense; /* sense buffer */
492 unsigned int sense_len; /* sense buffer len */
493 struct scsi_sense_hdr *sshdr; /* decoded sense header */
494 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */
495 int scmd_flags; /* SCMD flags */
496 int *resid; /* residual length */
497};
498
499int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
500 blk_opf_t opf, void *buffer, unsigned int bufflen,
501 int timeout, int retries,
502 const struct scsi_exec_args *args);
503
504extern void sdev_disable_disk_events(struct scsi_device *sdev);
505extern void sdev_enable_disk_events(struct scsi_device *sdev);
506extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
507extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
508
509#ifdef CONFIG_PM
510extern int scsi_autopm_get_device(struct scsi_device *);
511extern void scsi_autopm_put_device(struct scsi_device *);
512#else
513static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
514static inline void scsi_autopm_put_device(struct scsi_device *d) {}
515#endif /* CONFIG_PM */
516
517static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
518{
519 return device_reprobe(&sdev->sdev_gendev);
520}
521
522static inline unsigned int sdev_channel(struct scsi_device *sdev)
523{
524 return sdev->channel;
525}
526
527static inline unsigned int sdev_id(struct scsi_device *sdev)
528{
529 return sdev->id;
530}
531
532#define scmd_id(scmd) sdev_id((scmd)->device)
533#define scmd_channel(scmd) sdev_channel((scmd)->device)
534
535/*
536 * checks for positions of the SCSI state machine
537 */
538static inline int scsi_device_online(struct scsi_device *sdev)
539{
540 return (sdev->sdev_state != SDEV_OFFLINE &&
541 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
542 sdev->sdev_state != SDEV_DEL);
543}
544static inline int scsi_device_blocked(struct scsi_device *sdev)
545{
546 return sdev->sdev_state == SDEV_BLOCK ||
547 sdev->sdev_state == SDEV_CREATED_BLOCK;
548}
549static inline int scsi_device_created(struct scsi_device *sdev)
550{
551 return sdev->sdev_state == SDEV_CREATED ||
552 sdev->sdev_state == SDEV_CREATED_BLOCK;
553}
554
555int scsi_internal_device_block_nowait(struct scsi_device *sdev);
556int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
557 enum scsi_device_state new_state);
558
559/* accessor functions for the SCSI parameters */
560static inline int scsi_device_sync(struct scsi_device *sdev)
561{
562 return sdev->sdtr;
563}
564static inline int scsi_device_wide(struct scsi_device *sdev)
565{
566 return sdev->wdtr;
567}
568static inline int scsi_device_dt(struct scsi_device *sdev)
569{
570 return sdev->ppr;
571}
572static inline int scsi_device_dt_only(struct scsi_device *sdev)
573{
574 if (sdev->inquiry_len < 57)
575 return 0;
576 return (sdev->inquiry[56] & 0x0c) == 0x04;
577}
578static inline int scsi_device_ius(struct scsi_device *sdev)
579{
580 if (sdev->inquiry_len < 57)
581 return 0;
582 return sdev->inquiry[56] & 0x01;
583}
584static inline int scsi_device_qas(struct scsi_device *sdev)
585{
586 if (sdev->inquiry_len < 57)
587 return 0;
588 return sdev->inquiry[56] & 0x02;
589}
590static inline int scsi_device_enclosure(struct scsi_device *sdev)
591{
592 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
593}
594
595static inline int scsi_device_protection(struct scsi_device *sdev)
596{
597 if (sdev->no_dif)
598 return 0;
599
600 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
601}
602
603static inline int scsi_device_tpgs(struct scsi_device *sdev)
604{
605 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
606}
607
608/**
609 * scsi_device_supports_vpd - test if a device supports VPD pages
610 * @sdev: the &struct scsi_device to test
611 *
612 * If the 'try_vpd_pages' flag is set it takes precedence.
613 * Otherwise we will assume VPD pages are supported if the
614 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
615 */
616static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
617{
618 /* Attempt VPD inquiry if the device blacklist explicitly calls
619 * for it.
620 */
621 if (sdev->try_vpd_pages)
622 return 1;
623 /*
624 * Although VPD inquiries can go to SCSI-2 type devices,
625 * some USB ones crash on receiving them, and the pages
626 * we currently ask for are mandatory for SPC-2 and beyond
627 */
628 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
629 return 1;
630 return 0;
631}
632
633static inline int scsi_device_busy(struct scsi_device *sdev)
634{
635 return sbitmap_weight(&sdev->budget_map);
636}
637
638#define MODULE_ALIAS_SCSI_DEVICE(type) \
639 MODULE_ALIAS("scsi:t-" __stringify(type) "*")
640#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
641
642#endif /* _SCSI_SCSI_DEVICE_H */