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 static inline bool biovec_phys_mergeable(struct request_queue *q,
59 struct bio_vec *vec1, struct bio_vec *vec2)
61 unsigned long mask = queue_segment_boundary(q);
62 phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
63 phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
65 if (addr1 + vec1->bv_len != addr2)
67 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
69 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
74 static inline bool __bvec_gap_to_prev(struct request_queue *q,
75 struct bio_vec *bprv, unsigned int offset)
77 return (offset & queue_virt_boundary(q)) ||
78 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
82 * Check if adding a bio_vec after bprv with offset would create a gap in
83 * the SG list. Most drivers don't care about this, but some do.
85 static inline bool bvec_gap_to_prev(struct request_queue *q,
86 struct bio_vec *bprv, unsigned int offset)
88 if (!queue_virt_boundary(q))
90 return __bvec_gap_to_prev(q, bprv, offset);
93 #ifdef CONFIG_BLK_DEV_INTEGRITY
94 void blk_flush_integrity(void);
95 bool __bio_integrity_endio(struct bio *);
96 void bio_integrity_free(struct bio *bio);
97 static inline bool bio_integrity_endio(struct bio *bio)
99 if (bio_integrity(bio))
100 return __bio_integrity_endio(bio);
104 bool blk_integrity_merge_rq(struct request_queue *, struct request *,
106 bool blk_integrity_merge_bio(struct request_queue *, struct request *,
109 static inline bool integrity_req_gap_back_merge(struct request *req,
112 struct bio_integrity_payload *bip = bio_integrity(req->bio);
113 struct bio_integrity_payload *bip_next = bio_integrity(next);
115 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
116 bip_next->bip_vec[0].bv_offset);
119 static inline bool integrity_req_gap_front_merge(struct request *req,
122 struct bio_integrity_payload *bip = bio_integrity(bio);
123 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
125 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
126 bip_next->bip_vec[0].bv_offset);
129 void blk_integrity_add(struct gendisk *);
130 void blk_integrity_del(struct gendisk *);
131 #else /* CONFIG_BLK_DEV_INTEGRITY */
132 static inline bool blk_integrity_merge_rq(struct request_queue *rq,
133 struct request *r1, struct request *r2)
137 static inline bool blk_integrity_merge_bio(struct request_queue *rq,
138 struct request *r, struct bio *b)
142 static inline bool integrity_req_gap_back_merge(struct request *req,
147 static inline bool integrity_req_gap_front_merge(struct request *req,
153 static inline void blk_flush_integrity(void)
156 static inline bool bio_integrity_endio(struct bio *bio)
160 static inline void bio_integrity_free(struct bio *bio)
163 static inline void blk_integrity_add(struct gendisk *disk)
166 static inline void blk_integrity_del(struct gendisk *disk)
169 #endif /* CONFIG_BLK_DEV_INTEGRITY */
171 unsigned long blk_rq_timeout(unsigned long timeout);
172 void blk_add_timer(struct request *req);
174 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
175 unsigned int nr_segs, struct request **same_queue_rq);
176 bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
177 struct bio *bio, unsigned int nr_segs);
179 void blk_account_io_start(struct request *req);
180 void blk_account_io_done(struct request *req, u64 now);
183 * Internal elevator interface
185 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
187 void blk_insert_flush(struct request *rq);
189 void elevator_init_mq(struct request_queue *q);
190 int elevator_switch_mq(struct request_queue *q,
191 struct elevator_type *new_e);
192 void __elevator_exit(struct request_queue *, struct elevator_queue *);
193 int elv_register_queue(struct request_queue *q, bool uevent);
194 void elv_unregister_queue(struct request_queue *q);
196 static inline void elevator_exit(struct request_queue *q,
197 struct elevator_queue *e)
199 lockdep_assert_held(&q->sysfs_lock);
201 blk_mq_sched_free_requests(q);
202 __elevator_exit(q, e);
205 ssize_t part_size_show(struct device *dev, struct device_attribute *attr,
207 ssize_t part_stat_show(struct device *dev, struct device_attribute *attr,
209 ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
211 ssize_t part_fail_show(struct device *dev, struct device_attribute *attr,
213 ssize_t part_fail_store(struct device *dev, struct device_attribute *attr,
214 const char *buf, size_t count);
215 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
216 ssize_t part_timeout_store(struct device *, struct device_attribute *,
217 const char *, size_t);
219 void __blk_queue_split(struct bio **bio, unsigned int *nr_segs);
220 int ll_back_merge_fn(struct request *req, struct bio *bio,
221 unsigned int nr_segs);
222 int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
223 struct request *next);
224 unsigned int blk_recalc_rq_segments(struct request *rq);
225 void blk_rq_set_mixed_merge(struct request *rq);
226 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
227 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
229 int blk_dev_init(void);
232 * Contribute to IO statistics IFF:
234 * a) it's attached to a gendisk, and
235 * b) the queue had IO stats enabled when this request was started
237 static inline bool blk_do_io_stat(struct request *rq)
239 return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
242 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
244 req->cmd_flags |= REQ_NOMERGE;
245 if (req == q->last_merge)
246 q->last_merge = NULL;
250 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
251 * is defined as 'unsigned int', meantime it has to aligned to with logical
252 * block size which is the minimum accepted unit by hardware.
254 static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
256 return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
260 * The max bio size which is aligned to q->limits.discard_granularity. This
261 * is a hint to split large discard bio in generic block layer, then if device
262 * driver needs to split the discard bio into smaller ones, their bi_size can
263 * be very probably and easily aligned to discard_granularity of the device's
266 static inline unsigned int bio_aligned_discard_max_sectors(
267 struct request_queue *q)
269 return round_down(UINT_MAX, q->limits.discard_granularity) >>
274 * Internal io_context interface
276 void get_io_context(struct io_context *ioc);
277 struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
278 struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
280 void ioc_clear_queue(struct request_queue *q);
282 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
285 * Internal throttling interface
287 #ifdef CONFIG_BLK_DEV_THROTTLING
288 extern int blk_throtl_init(struct request_queue *q);
289 extern void blk_throtl_exit(struct request_queue *q);
290 extern void blk_throtl_register_queue(struct request_queue *q);
291 bool blk_throtl_bio(struct bio *bio);
292 #else /* CONFIG_BLK_DEV_THROTTLING */
293 static inline int blk_throtl_init(struct request_queue *q) { return 0; }
294 static inline void blk_throtl_exit(struct request_queue *q) { }
295 static inline void blk_throtl_register_queue(struct request_queue *q) { }
296 static inline bool blk_throtl_bio(struct bio *bio) { return false; }
297 #endif /* CONFIG_BLK_DEV_THROTTLING */
298 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
299 extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
300 extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
301 const char *page, size_t count);
302 extern void blk_throtl_bio_endio(struct bio *bio);
303 extern void blk_throtl_stat_add(struct request *rq, u64 time);
305 static inline void blk_throtl_bio_endio(struct bio *bio) { }
306 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
310 extern int init_emergency_isa_pool(void);
311 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
313 static inline int init_emergency_isa_pool(void)
317 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
320 #endif /* CONFIG_BOUNCE */
322 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
323 extern int blk_iolatency_init(struct request_queue *q);
325 static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
328 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
330 #ifdef CONFIG_BLK_DEV_ZONED
331 void blk_queue_free_zone_bitmaps(struct request_queue *q);
333 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
336 struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector);
338 int blk_alloc_devt(struct block_device *part, dev_t *devt);
339 void blk_free_devt(dev_t devt);
340 char *disk_name(struct gendisk *hd, int partno, char *buf);
341 #define ADDPART_FLAG_NONE 0
342 #define ADDPART_FLAG_RAID 1
343 #define ADDPART_FLAG_WHOLEDISK 2
344 void delete_partition(struct block_device *part);
345 int bdev_add_partition(struct block_device *bdev, int partno,
346 sector_t start, sector_t length);
347 int bdev_del_partition(struct block_device *bdev, int partno);
348 int bdev_resize_partition(struct block_device *bdev, int partno,
349 sector_t start, sector_t length);
350 int disk_expand_part_tbl(struct gendisk *disk, int target);
352 int bio_add_hw_page(struct request_queue *q, struct bio *bio,
353 struct page *page, unsigned int len, unsigned int offset,
354 unsigned int max_sectors, bool *same_page);
356 #endif /* BLK_INTERNAL_H */