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>
9 #include <linux/memblock.h> /* for max_pfn/max_low_pfn */
11 #include "blk-crypto-internal.h"
13 #include "blk-mq-sched.h"
15 /* Max future timer expiry for timeouts */
16 #define BLK_MAX_TIMEOUT (5 * HZ)
18 extern struct dentry
*blk_debugfs_root
;
20 struct blk_flush_queue
{
21 unsigned int flush_pending_idx
:1;
22 unsigned int flush_running_idx
:1;
23 blk_status_t rq_status
;
24 unsigned long flush_pending_since
;
25 struct list_head flush_queue
[2];
26 struct list_head flush_data_in_flight
;
27 struct request
*flush_rq
;
29 spinlock_t mq_flush_lock
;
32 extern struct kmem_cache
*blk_requestq_cachep
;
33 extern struct kobj_type blk_queue_ktype
;
34 extern struct ida blk_queue_ida
;
36 static inline struct blk_flush_queue
*
37 blk_get_flush_queue(struct request_queue
*q
, struct blk_mq_ctx
*ctx
)
39 return blk_mq_map_queue(q
, REQ_OP_FLUSH
, ctx
)->fq
;
42 static inline void __blk_get_queue(struct request_queue
*q
)
44 kobject_get(&q
->kobj
);
47 bool is_flush_rq(struct request
*req
);
49 struct blk_flush_queue
*blk_alloc_flush_queue(int node
, int cmd_size
,
51 void blk_free_flush_queue(struct blk_flush_queue
*q
);
53 void blk_freeze_queue(struct request_queue
*q
);
55 #define BIO_INLINE_VECS 4
56 struct bio_vec
*bvec_alloc(mempool_t
*pool
, unsigned short *nr_vecs
,
58 void bvec_free(mempool_t
*pool
, struct bio_vec
*bv
, unsigned short nr_vecs
);
60 static inline bool biovec_phys_mergeable(struct request_queue
*q
,
61 struct bio_vec
*vec1
, struct bio_vec
*vec2
)
63 unsigned long mask
= queue_segment_boundary(q
);
64 phys_addr_t addr1
= page_to_phys(vec1
->bv_page
) + vec1
->bv_offset
;
65 phys_addr_t addr2
= page_to_phys(vec2
->bv_page
) + vec2
->bv_offset
;
67 if (addr1
+ vec1
->bv_len
!= addr2
)
69 if (xen_domain() && !xen_biovec_phys_mergeable(vec1
, vec2
->bv_page
))
71 if ((addr1
| mask
) != ((addr2
+ vec2
->bv_len
- 1) | mask
))
76 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
77 struct bio_vec
*bprv
, unsigned int offset
)
79 return (offset
& queue_virt_boundary(q
)) ||
80 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
84 * Check if adding a bio_vec after bprv with offset would create a gap in
85 * the SG list. Most drivers don't care about this, but some do.
87 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
88 struct bio_vec
*bprv
, unsigned int offset
)
90 if (!queue_virt_boundary(q
))
92 return __bvec_gap_to_prev(q
, bprv
, offset
);
95 #ifdef CONFIG_BLK_DEV_INTEGRITY
96 void blk_flush_integrity(void);
97 bool __bio_integrity_endio(struct bio
*);
98 void bio_integrity_free(struct bio
*bio
);
99 static inline bool bio_integrity_endio(struct bio
*bio
)
101 if (bio_integrity(bio
))
102 return __bio_integrity_endio(bio
);
106 bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
108 bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
111 static inline bool integrity_req_gap_back_merge(struct request
*req
,
114 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
115 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
117 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
118 bip_next
->bip_vec
[0].bv_offset
);
121 static inline bool integrity_req_gap_front_merge(struct request
*req
,
124 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
125 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
127 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
128 bip_next
->bip_vec
[0].bv_offset
);
131 int blk_integrity_add(struct gendisk
*disk
);
132 void blk_integrity_del(struct gendisk
*);
133 #else /* CONFIG_BLK_DEV_INTEGRITY */
134 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
135 struct request
*r1
, struct request
*r2
)
139 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
140 struct request
*r
, struct bio
*b
)
144 static inline bool integrity_req_gap_back_merge(struct request
*req
,
149 static inline bool integrity_req_gap_front_merge(struct request
*req
,
155 static inline void blk_flush_integrity(void)
158 static inline bool bio_integrity_endio(struct bio
*bio
)
162 static inline void bio_integrity_free(struct bio
*bio
)
165 static inline int blk_integrity_add(struct gendisk
*disk
)
169 static inline void blk_integrity_del(struct gendisk
*disk
)
172 #endif /* CONFIG_BLK_DEV_INTEGRITY */
174 unsigned long blk_rq_timeout(unsigned long timeout
);
175 void blk_add_timer(struct request
*req
);
177 bool blk_attempt_plug_merge(struct request_queue
*q
, struct bio
*bio
,
178 unsigned int nr_segs
, struct request
**same_queue_rq
);
179 bool blk_bio_list_merge(struct request_queue
*q
, struct list_head
*list
,
180 struct bio
*bio
, unsigned int nr_segs
);
182 void blk_account_io_start(struct request
*req
);
183 void blk_account_io_done(struct request
*req
, u64 now
);
186 * Internal elevator interface
188 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
190 void blk_insert_flush(struct request
*rq
);
192 int elevator_switch_mq(struct request_queue
*q
,
193 struct elevator_type
*new_e
);
194 void __elevator_exit(struct request_queue
*, struct elevator_queue
*);
195 int elv_register_queue(struct request_queue
*q
, bool uevent
);
196 void elv_unregister_queue(struct request_queue
*q
);
198 static inline void elevator_exit(struct request_queue
*q
,
199 struct elevator_queue
*e
)
201 lockdep_assert_held(&q
->sysfs_lock
);
203 blk_mq_sched_free_requests(q
);
204 __elevator_exit(q
, e
);
207 ssize_t
part_size_show(struct device
*dev
, struct device_attribute
*attr
,
209 ssize_t
part_stat_show(struct device
*dev
, struct device_attribute
*attr
,
211 ssize_t
part_inflight_show(struct device
*dev
, struct device_attribute
*attr
,
213 ssize_t
part_fail_show(struct device
*dev
, struct device_attribute
*attr
,
215 ssize_t
part_fail_store(struct device
*dev
, struct device_attribute
*attr
,
216 const char *buf
, size_t count
);
217 ssize_t
part_timeout_show(struct device
*, struct device_attribute
*, char *);
218 ssize_t
part_timeout_store(struct device
*, struct device_attribute
*,
219 const char *, size_t);
221 void __blk_queue_split(struct bio
**bio
, unsigned int *nr_segs
);
222 int ll_back_merge_fn(struct request
*req
, struct bio
*bio
,
223 unsigned int nr_segs
);
224 bool blk_attempt_req_merge(struct request_queue
*q
, struct request
*rq
,
225 struct request
*next
);
226 unsigned int blk_recalc_rq_segments(struct request
*rq
);
227 void blk_rq_set_mixed_merge(struct request
*rq
);
228 bool blk_rq_merge_ok(struct request
*rq
, struct bio
*bio
);
229 enum elv_merge
blk_try_merge(struct request
*rq
, struct bio
*bio
);
231 int blk_dev_init(void);
234 * Contribute to IO statistics IFF:
236 * a) it's attached to a gendisk, and
237 * b) the queue had IO stats enabled when this request was started
239 static inline bool blk_do_io_stat(struct request
*rq
)
241 return rq
->rq_disk
&& (rq
->rq_flags
& RQF_IO_STAT
);
244 static inline void req_set_nomerge(struct request_queue
*q
, struct request
*req
)
246 req
->cmd_flags
|= REQ_NOMERGE
;
247 if (req
== q
->last_merge
)
248 q
->last_merge
= NULL
;
252 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
253 * is defined as 'unsigned int', meantime it has to aligned to with logical
254 * block size which is the minimum accepted unit by hardware.
256 static inline unsigned int bio_allowed_max_sectors(struct request_queue
*q
)
258 return round_down(UINT_MAX
, queue_logical_block_size(q
)) >> 9;
262 * The max bio size which is aligned to q->limits.discard_granularity. This
263 * is a hint to split large discard bio in generic block layer, then if device
264 * driver needs to split the discard bio into smaller ones, their bi_size can
265 * be very probably and easily aligned to discard_granularity of the device's
268 static inline unsigned int bio_aligned_discard_max_sectors(
269 struct request_queue
*q
)
271 return round_down(UINT_MAX
, q
->limits
.discard_granularity
) >>
276 * Internal io_context interface
278 void get_io_context(struct io_context
*ioc
);
279 struct io_cq
*ioc_lookup_icq(struct io_context
*ioc
, struct request_queue
*q
);
280 struct io_cq
*ioc_create_icq(struct io_context
*ioc
, struct request_queue
*q
,
282 void ioc_clear_queue(struct request_queue
*q
);
284 int create_task_io_context(struct task_struct
*task
, gfp_t gfp_mask
, int node
);
287 * Internal throttling interface
289 #ifdef CONFIG_BLK_DEV_THROTTLING
290 extern int blk_throtl_init(struct request_queue
*q
);
291 extern void blk_throtl_exit(struct request_queue
*q
);
292 extern void blk_throtl_register_queue(struct request_queue
*q
);
293 extern void blk_throtl_charge_bio_split(struct bio
*bio
);
294 bool blk_throtl_bio(struct bio
*bio
);
295 #else /* CONFIG_BLK_DEV_THROTTLING */
296 static inline int blk_throtl_init(struct request_queue
*q
) { return 0; }
297 static inline void blk_throtl_exit(struct request_queue
*q
) { }
298 static inline void blk_throtl_register_queue(struct request_queue
*q
) { }
299 static inline void blk_throtl_charge_bio_split(struct bio
*bio
) { }
300 static inline bool blk_throtl_bio(struct bio
*bio
) { return false; }
301 #endif /* CONFIG_BLK_DEV_THROTTLING */
302 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
303 extern ssize_t
blk_throtl_sample_time_show(struct request_queue
*q
, char *page
);
304 extern ssize_t
blk_throtl_sample_time_store(struct request_queue
*q
,
305 const char *page
, size_t count
);
306 extern void blk_throtl_bio_endio(struct bio
*bio
);
307 extern void blk_throtl_stat_add(struct request
*rq
, u64 time
);
309 static inline void blk_throtl_bio_endio(struct bio
*bio
) { }
310 static inline void blk_throtl_stat_add(struct request
*rq
, u64 time
) { }
313 void __blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
315 static inline bool blk_queue_may_bounce(struct request_queue
*q
)
317 return IS_ENABLED(CONFIG_BOUNCE
) &&
318 q
->limits
.bounce
== BLK_BOUNCE_HIGH
&&
319 max_low_pfn
>= max_pfn
;
322 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
324 if (unlikely(blk_queue_may_bounce(q
) && bio_has_data(*bio
)))
325 __blk_queue_bounce(q
, bio
);
328 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
329 extern int blk_iolatency_init(struct request_queue
*q
);
331 static inline int blk_iolatency_init(struct request_queue
*q
) { return 0; }
334 struct bio
*blk_next_bio(struct bio
*bio
, unsigned int nr_pages
, gfp_t gfp
);
336 #ifdef CONFIG_BLK_DEV_ZONED
337 void blk_queue_free_zone_bitmaps(struct request_queue
*q
);
338 void blk_queue_clear_zone_settings(struct request_queue
*q
);
340 static inline void blk_queue_free_zone_bitmaps(struct request_queue
*q
) {}
341 static inline void blk_queue_clear_zone_settings(struct request_queue
*q
) {}
344 int blk_alloc_ext_minor(void);
345 void blk_free_ext_minor(unsigned int minor
);
346 #define ADDPART_FLAG_NONE 0
347 #define ADDPART_FLAG_RAID 1
348 #define ADDPART_FLAG_WHOLEDISK 2
349 int bdev_add_partition(struct gendisk
*disk
, int partno
, sector_t start
,
351 int bdev_del_partition(struct gendisk
*disk
, int partno
);
352 int bdev_resize_partition(struct gendisk
*disk
, int partno
, sector_t start
,
355 int bio_add_hw_page(struct request_queue
*q
, struct bio
*bio
,
356 struct page
*page
, unsigned int len
, unsigned int offset
,
357 unsigned int max_sectors
, bool *same_page
);
359 struct request_queue
*blk_alloc_queue(int node_id
);
361 int disk_alloc_events(struct gendisk
*disk
);
362 void disk_add_events(struct gendisk
*disk
);
363 void disk_del_events(struct gendisk
*disk
);
364 void disk_release_events(struct gendisk
*disk
);
365 extern struct device_attribute dev_attr_events
;
366 extern struct device_attribute dev_attr_events_async
;
367 extern struct device_attribute dev_attr_events_poll_msecs
;
369 static inline void bio_clear_hipri(struct bio
*bio
)
371 /* can't support alloc cache if we turn off polling */
372 bio_clear_flag(bio
, BIO_PERCPU_CACHE
);
373 bio
->bi_opf
&= ~REQ_HIPRI
;
376 extern const struct address_space_operations def_blk_aops
;
378 #endif /* BLK_INTERNAL_H */