1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/blk-mq.h>
7 #include <linux/part_stat.h>
8 #include <linux/blk-crypto.h>
10 #include "blk-crypto-internal.h"
12 #include "blk-mq-sched.h"
14 /* Max future timer expiry for timeouts */
15 #define BLK_MAX_TIMEOUT (5 * HZ)
17 extern struct dentry
*blk_debugfs_root
;
19 struct blk_flush_queue
{
20 unsigned int flush_pending_idx
:1;
21 unsigned int flush_running_idx
:1;
22 blk_status_t rq_status
;
23 unsigned long flush_pending_since
;
24 struct list_head flush_queue
[2];
25 struct list_head flush_data_in_flight
;
26 struct request
*flush_rq
;
28 spinlock_t mq_flush_lock
;
31 extern struct kmem_cache
*blk_requestq_cachep
;
32 extern struct kobj_type blk_queue_ktype
;
33 extern struct ida blk_queue_ida
;
35 static inline struct blk_flush_queue
*
36 blk_get_flush_queue(struct request_queue
*q
, struct blk_mq_ctx
*ctx
)
38 return blk_mq_map_queue(q
, REQ_OP_FLUSH
, ctx
)->fq
;
41 static inline void __blk_get_queue(struct request_queue
*q
)
43 kobject_get(&q
->kobj
);
47 is_flush_rq(struct request
*req
, struct blk_mq_hw_ctx
*hctx
)
49 return hctx
->fq
->flush_rq
== req
;
52 struct blk_flush_queue
*blk_alloc_flush_queue(int node
, int cmd_size
,
54 void blk_free_flush_queue(struct blk_flush_queue
*q
);
56 void blk_freeze_queue(struct request_queue
*q
);
58 #define BIO_INLINE_VECS 4
59 struct bio_vec
*bvec_alloc(mempool_t
*pool
, unsigned short *nr_vecs
,
61 void bvec_free(mempool_t
*pool
, struct bio_vec
*bv
, unsigned short nr_vecs
);
63 static inline bool biovec_phys_mergeable(struct request_queue
*q
,
64 struct bio_vec
*vec1
, struct bio_vec
*vec2
)
66 unsigned long mask
= queue_segment_boundary(q
);
67 phys_addr_t addr1
= page_to_phys(vec1
->bv_page
) + vec1
->bv_offset
;
68 phys_addr_t addr2
= page_to_phys(vec2
->bv_page
) + vec2
->bv_offset
;
70 if (addr1
+ vec1
->bv_len
!= addr2
)
72 if (xen_domain() && !xen_biovec_phys_mergeable(vec1
, vec2
->bv_page
))
74 if ((addr1
| mask
) != ((addr2
+ vec2
->bv_len
- 1) | mask
))
79 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
80 struct bio_vec
*bprv
, unsigned int offset
)
82 return (offset
& queue_virt_boundary(q
)) ||
83 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
87 * Check if adding a bio_vec after bprv with offset would create a gap in
88 * the SG list. Most drivers don't care about this, but some do.
90 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
91 struct bio_vec
*bprv
, unsigned int offset
)
93 if (!queue_virt_boundary(q
))
95 return __bvec_gap_to_prev(q
, bprv
, offset
);
98 #ifdef CONFIG_BLK_DEV_INTEGRITY
99 void blk_flush_integrity(void);
100 bool __bio_integrity_endio(struct bio
*);
101 void bio_integrity_free(struct bio
*bio
);
102 static inline bool bio_integrity_endio(struct bio
*bio
)
104 if (bio_integrity(bio
))
105 return __bio_integrity_endio(bio
);
109 bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
111 bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
114 static inline bool integrity_req_gap_back_merge(struct request
*req
,
117 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
118 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
120 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
121 bip_next
->bip_vec
[0].bv_offset
);
124 static inline bool integrity_req_gap_front_merge(struct request
*req
,
127 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
128 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
130 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
131 bip_next
->bip_vec
[0].bv_offset
);
134 void blk_integrity_add(struct gendisk
*);
135 void blk_integrity_del(struct gendisk
*);
136 #else /* CONFIG_BLK_DEV_INTEGRITY */
137 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
138 struct request
*r1
, struct request
*r2
)
142 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
143 struct request
*r
, struct bio
*b
)
147 static inline bool integrity_req_gap_back_merge(struct request
*req
,
152 static inline bool integrity_req_gap_front_merge(struct request
*req
,
158 static inline void blk_flush_integrity(void)
161 static inline bool bio_integrity_endio(struct bio
*bio
)
165 static inline void bio_integrity_free(struct bio
*bio
)
168 static inline void blk_integrity_add(struct gendisk
*disk
)
171 static inline void blk_integrity_del(struct gendisk
*disk
)
174 #endif /* CONFIG_BLK_DEV_INTEGRITY */
176 unsigned long blk_rq_timeout(unsigned long timeout
);
177 void blk_add_timer(struct request
*req
);
179 bool blk_attempt_plug_merge(struct request_queue
*q
, struct bio
*bio
,
180 unsigned int nr_segs
, struct request
**same_queue_rq
);
181 bool blk_bio_list_merge(struct request_queue
*q
, struct list_head
*list
,
182 struct bio
*bio
, unsigned int nr_segs
);
184 void blk_account_io_start(struct request
*req
);
185 void blk_account_io_done(struct request
*req
, u64 now
);
188 * Internal elevator interface
190 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
192 void blk_insert_flush(struct request
*rq
);
194 void elevator_init_mq(struct request_queue
*q
);
195 int elevator_switch_mq(struct request_queue
*q
,
196 struct elevator_type
*new_e
);
197 void __elevator_exit(struct request_queue
*, struct elevator_queue
*);
198 int elv_register_queue(struct request_queue
*q
, bool uevent
);
199 void elv_unregister_queue(struct request_queue
*q
);
201 static inline void elevator_exit(struct request_queue
*q
,
202 struct elevator_queue
*e
)
204 lockdep_assert_held(&q
->sysfs_lock
);
206 blk_mq_sched_free_requests(q
);
207 __elevator_exit(q
, e
);
210 ssize_t
part_size_show(struct device
*dev
, struct device_attribute
*attr
,
212 ssize_t
part_stat_show(struct device
*dev
, struct device_attribute
*attr
,
214 ssize_t
part_inflight_show(struct device
*dev
, struct device_attribute
*attr
,
216 ssize_t
part_fail_show(struct device
*dev
, struct device_attribute
*attr
,
218 ssize_t
part_fail_store(struct device
*dev
, struct device_attribute
*attr
,
219 const char *buf
, size_t count
);
220 ssize_t
part_timeout_show(struct device
*, struct device_attribute
*, char *);
221 ssize_t
part_timeout_store(struct device
*, struct device_attribute
*,
222 const char *, size_t);
224 void __blk_queue_split(struct bio
**bio
, unsigned int *nr_segs
);
225 int ll_back_merge_fn(struct request
*req
, struct bio
*bio
,
226 unsigned int nr_segs
);
227 int blk_attempt_req_merge(struct request_queue
*q
, struct request
*rq
,
228 struct request
*next
);
229 unsigned int blk_recalc_rq_segments(struct request
*rq
);
230 void blk_rq_set_mixed_merge(struct request
*rq
);
231 bool blk_rq_merge_ok(struct request
*rq
, struct bio
*bio
);
232 enum elv_merge
blk_try_merge(struct request
*rq
, struct bio
*bio
);
234 int blk_dev_init(void);
237 * Contribute to IO statistics IFF:
239 * a) it's attached to a gendisk, and
240 * b) the queue had IO stats enabled when this request was started
242 static inline bool blk_do_io_stat(struct request
*rq
)
244 return rq
->rq_disk
&& (rq
->rq_flags
& RQF_IO_STAT
);
247 static inline void req_set_nomerge(struct request_queue
*q
, struct request
*req
)
249 req
->cmd_flags
|= REQ_NOMERGE
;
250 if (req
== q
->last_merge
)
251 q
->last_merge
= NULL
;
255 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
256 * is defined as 'unsigned int', meantime it has to aligned to with logical
257 * block size which is the minimum accepted unit by hardware.
259 static inline unsigned int bio_allowed_max_sectors(struct request_queue
*q
)
261 return round_down(UINT_MAX
, queue_logical_block_size(q
)) >> 9;
265 * The max bio size which is aligned to q->limits.discard_granularity. This
266 * is a hint to split large discard bio in generic block layer, then if device
267 * driver needs to split the discard bio into smaller ones, their bi_size can
268 * be very probably and easily aligned to discard_granularity of the device's
271 static inline unsigned int bio_aligned_discard_max_sectors(
272 struct request_queue
*q
)
274 return round_down(UINT_MAX
, q
->limits
.discard_granularity
) >>
279 * Internal io_context interface
281 void get_io_context(struct io_context
*ioc
);
282 struct io_cq
*ioc_lookup_icq(struct io_context
*ioc
, struct request_queue
*q
);
283 struct io_cq
*ioc_create_icq(struct io_context
*ioc
, struct request_queue
*q
,
285 void ioc_clear_queue(struct request_queue
*q
);
287 int create_task_io_context(struct task_struct
*task
, gfp_t gfp_mask
, int node
);
290 * Internal throttling interface
292 #ifdef CONFIG_BLK_DEV_THROTTLING
293 extern int blk_throtl_init(struct request_queue
*q
);
294 extern void blk_throtl_exit(struct request_queue
*q
);
295 extern void blk_throtl_register_queue(struct request_queue
*q
);
296 bool blk_throtl_bio(struct bio
*bio
);
297 #else /* CONFIG_BLK_DEV_THROTTLING */
298 static inline int blk_throtl_init(struct request_queue
*q
) { return 0; }
299 static inline void blk_throtl_exit(struct request_queue
*q
) { }
300 static inline void blk_throtl_register_queue(struct request_queue
*q
) { }
301 static inline bool blk_throtl_bio(struct bio
*bio
) { return false; }
302 #endif /* CONFIG_BLK_DEV_THROTTLING */
303 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
304 extern ssize_t
blk_throtl_sample_time_show(struct request_queue
*q
, char *page
);
305 extern ssize_t
blk_throtl_sample_time_store(struct request_queue
*q
,
306 const char *page
, size_t count
);
307 extern void blk_throtl_bio_endio(struct bio
*bio
);
308 extern void blk_throtl_stat_add(struct request
*rq
, u64 time
);
310 static inline void blk_throtl_bio_endio(struct bio
*bio
) { }
311 static inline void blk_throtl_stat_add(struct request
*rq
, u64 time
) { }
315 extern int init_emergency_isa_pool(void);
316 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
318 static inline int init_emergency_isa_pool(void)
322 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
325 #endif /* CONFIG_BOUNCE */
327 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
328 extern int blk_iolatency_init(struct request_queue
*q
);
330 static inline int blk_iolatency_init(struct request_queue
*q
) { return 0; }
333 struct bio
*blk_next_bio(struct bio
*bio
, unsigned int nr_pages
, gfp_t gfp
);
335 #ifdef CONFIG_BLK_DEV_ZONED
336 void blk_queue_free_zone_bitmaps(struct request_queue
*q
);
337 void blk_queue_clear_zone_settings(struct request_queue
*q
);
339 static inline void blk_queue_free_zone_bitmaps(struct request_queue
*q
) {}
340 static inline void blk_queue_clear_zone_settings(struct request_queue
*q
) {}
343 int blk_alloc_devt(struct block_device
*part
, dev_t
*devt
);
344 void blk_free_devt(dev_t devt
);
345 char *disk_name(struct gendisk
*hd
, int partno
, char *buf
);
346 #define ADDPART_FLAG_NONE 0
347 #define ADDPART_FLAG_RAID 1
348 #define ADDPART_FLAG_WHOLEDISK 2
349 void delete_partition(struct block_device
*part
);
350 int bdev_add_partition(struct block_device
*bdev
, int partno
,
351 sector_t start
, sector_t length
);
352 int bdev_del_partition(struct block_device
*bdev
, int partno
);
353 int bdev_resize_partition(struct block_device
*bdev
, int partno
,
354 sector_t start
, sector_t length
);
356 int bio_add_hw_page(struct request_queue
*q
, struct bio
*bio
,
357 struct page
*page
, unsigned int len
, unsigned int offset
,
358 unsigned int max_sectors
, bool *same_page
);
360 #endif /* BLK_INTERNAL_H */