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);
48 is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx)
50 return hctx->fq->flush_rq == req;
53 struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
55 void blk_free_flush_queue(struct blk_flush_queue *q);
57 void blk_freeze_queue(struct request_queue *q);
59 #define BIO_INLINE_VECS 4
60 struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs,
62 void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned short nr_vecs);
64 static inline bool biovec_phys_mergeable(struct request_queue *q,
65 struct bio_vec *vec1, struct bio_vec *vec2)
67 unsigned long mask = queue_segment_boundary(q);
68 phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
69 phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
71 if (addr1 + vec1->bv_len != addr2)
73 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
75 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
80 static inline bool __bvec_gap_to_prev(struct request_queue *q,
81 struct bio_vec *bprv, unsigned int offset)
83 return (offset & queue_virt_boundary(q)) ||
84 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
88 * Check if adding a bio_vec after bprv with offset would create a gap in
89 * the SG list. Most drivers don't care about this, but some do.
91 static inline bool bvec_gap_to_prev(struct request_queue *q,
92 struct bio_vec *bprv, unsigned int offset)
94 if (!queue_virt_boundary(q))
96 return __bvec_gap_to_prev(q, bprv, offset);
99 #ifdef CONFIG_BLK_DEV_INTEGRITY
100 void blk_flush_integrity(void);
101 bool __bio_integrity_endio(struct bio *);
102 void bio_integrity_free(struct bio *bio);
103 static inline bool bio_integrity_endio(struct bio *bio)
105 if (bio_integrity(bio))
106 return __bio_integrity_endio(bio);
110 bool blk_integrity_merge_rq(struct request_queue *, struct request *,
112 bool blk_integrity_merge_bio(struct request_queue *, struct request *,
115 static inline bool integrity_req_gap_back_merge(struct request *req,
118 struct bio_integrity_payload *bip = bio_integrity(req->bio);
119 struct bio_integrity_payload *bip_next = bio_integrity(next);
121 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
122 bip_next->bip_vec[0].bv_offset);
125 static inline bool integrity_req_gap_front_merge(struct request *req,
128 struct bio_integrity_payload *bip = bio_integrity(bio);
129 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
131 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
132 bip_next->bip_vec[0].bv_offset);
135 void blk_integrity_add(struct gendisk *);
136 void blk_integrity_del(struct gendisk *);
137 #else /* CONFIG_BLK_DEV_INTEGRITY */
138 static inline bool blk_integrity_merge_rq(struct request_queue *rq,
139 struct request *r1, struct request *r2)
143 static inline bool blk_integrity_merge_bio(struct request_queue *rq,
144 struct request *r, struct bio *b)
148 static inline bool integrity_req_gap_back_merge(struct request *req,
153 static inline bool integrity_req_gap_front_merge(struct request *req,
159 static inline void blk_flush_integrity(void)
162 static inline bool bio_integrity_endio(struct bio *bio)
166 static inline void bio_integrity_free(struct bio *bio)
169 static inline void blk_integrity_add(struct gendisk *disk)
172 static inline void blk_integrity_del(struct gendisk *disk)
175 #endif /* CONFIG_BLK_DEV_INTEGRITY */
177 unsigned long blk_rq_timeout(unsigned long timeout);
178 void blk_add_timer(struct request *req);
180 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
181 unsigned int nr_segs, struct request **same_queue_rq);
182 bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
183 struct bio *bio, unsigned int nr_segs);
185 void blk_account_io_start(struct request *req);
186 void blk_account_io_done(struct request *req, u64 now);
189 * Internal elevator interface
191 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
193 void blk_insert_flush(struct request *rq);
195 void elevator_init_mq(struct request_queue *q);
196 int elevator_switch_mq(struct request_queue *q,
197 struct elevator_type *new_e);
198 void __elevator_exit(struct request_queue *, struct elevator_queue *);
199 int elv_register_queue(struct request_queue *q, bool uevent);
200 void elv_unregister_queue(struct request_queue *q);
202 static inline void elevator_exit(struct request_queue *q,
203 struct elevator_queue *e)
205 lockdep_assert_held(&q->sysfs_lock);
207 blk_mq_sched_free_requests(q);
208 __elevator_exit(q, e);
211 ssize_t part_size_show(struct device *dev, struct device_attribute *attr,
213 ssize_t part_stat_show(struct device *dev, struct device_attribute *attr,
215 ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
217 ssize_t part_fail_show(struct device *dev, struct device_attribute *attr,
219 ssize_t part_fail_store(struct device *dev, struct device_attribute *attr,
220 const char *buf, size_t count);
221 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
222 ssize_t part_timeout_store(struct device *, struct device_attribute *,
223 const char *, size_t);
225 void __blk_queue_split(struct bio **bio, unsigned int *nr_segs);
226 int ll_back_merge_fn(struct request *req, struct bio *bio,
227 unsigned int nr_segs);
228 int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
229 struct request *next);
230 unsigned int blk_recalc_rq_segments(struct request *rq);
231 void blk_rq_set_mixed_merge(struct request *rq);
232 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
233 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
235 int blk_dev_init(void);
238 * Contribute to IO statistics IFF:
240 * a) it's attached to a gendisk, and
241 * b) the queue had IO stats enabled when this request was started
243 static inline bool blk_do_io_stat(struct request *rq)
245 return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
248 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
250 req->cmd_flags |= REQ_NOMERGE;
251 if (req == q->last_merge)
252 q->last_merge = NULL;
256 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
257 * is defined as 'unsigned int', meantime it has to aligned to with logical
258 * block size which is the minimum accepted unit by hardware.
260 static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
262 return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
266 * The max bio size which is aligned to q->limits.discard_granularity. This
267 * is a hint to split large discard bio in generic block layer, then if device
268 * driver needs to split the discard bio into smaller ones, their bi_size can
269 * be very probably and easily aligned to discard_granularity of the device's
272 static inline unsigned int bio_aligned_discard_max_sectors(
273 struct request_queue *q)
275 return round_down(UINT_MAX, q->limits.discard_granularity) >>
280 * Internal io_context interface
282 void get_io_context(struct io_context *ioc);
283 struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
284 struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
286 void ioc_clear_queue(struct request_queue *q);
288 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
291 * Internal throttling interface
293 #ifdef CONFIG_BLK_DEV_THROTTLING
294 extern int blk_throtl_init(struct request_queue *q);
295 extern void blk_throtl_exit(struct request_queue *q);
296 extern void blk_throtl_register_queue(struct request_queue *q);
297 bool blk_throtl_bio(struct bio *bio);
298 #else /* CONFIG_BLK_DEV_THROTTLING */
299 static inline int blk_throtl_init(struct request_queue *q) { return 0; }
300 static inline void blk_throtl_exit(struct request_queue *q) { }
301 static inline void blk_throtl_register_queue(struct request_queue *q) { }
302 static inline bool blk_throtl_bio(struct bio *bio) { return false; }
303 #endif /* CONFIG_BLK_DEV_THROTTLING */
304 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
305 extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
306 extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
307 const char *page, size_t count);
308 extern void blk_throtl_bio_endio(struct bio *bio);
309 extern void blk_throtl_stat_add(struct request *rq, u64 time);
311 static inline void blk_throtl_bio_endio(struct bio *bio) { }
312 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
315 void __blk_queue_bounce(struct request_queue *q, struct bio **bio);
317 static inline bool blk_queue_may_bounce(struct request_queue *q)
319 return IS_ENABLED(CONFIG_BOUNCE) &&
320 q->limits.bounce == BLK_BOUNCE_HIGH &&
321 max_low_pfn >= max_pfn;
324 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
326 if (unlikely(blk_queue_may_bounce(q) && bio_has_data(*bio)))
327 __blk_queue_bounce(q, bio);
330 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
331 extern int blk_iolatency_init(struct request_queue *q);
333 static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
336 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
338 #ifdef CONFIG_BLK_DEV_ZONED
339 void blk_queue_free_zone_bitmaps(struct request_queue *q);
340 void blk_queue_clear_zone_settings(struct request_queue *q);
342 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
343 static inline void blk_queue_clear_zone_settings(struct request_queue *q) {}
346 int blk_alloc_devt(struct block_device *part, dev_t *devt);
347 void blk_free_devt(dev_t devt);
348 char *disk_name(struct gendisk *hd, int partno, char *buf);
349 #define ADDPART_FLAG_NONE 0
350 #define ADDPART_FLAG_RAID 1
351 #define ADDPART_FLAG_WHOLEDISK 2
352 int bdev_add_partition(struct block_device *bdev, int partno,
353 sector_t start, sector_t length);
354 int bdev_del_partition(struct block_device *bdev, int partno);
355 int bdev_resize_partition(struct block_device *bdev, int partno,
356 sector_t start, sector_t length);
358 int bio_add_hw_page(struct request_queue *q, struct bio *bio,
359 struct page *page, unsigned int len, unsigned int offset,
360 unsigned int max_sectors, bool *same_page);
362 #endif /* BLK_INTERNAL_H */