1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/blk-mq.h>
9 #include "blk-mq-sched.h"
11 /* Max future timer expiry for timeouts */
12 #define BLK_MAX_TIMEOUT (5 * HZ)
14 #ifdef CONFIG_DEBUG_FS
15 extern struct dentry *blk_debugfs_root;
18 struct blk_flush_queue {
19 unsigned int flush_queue_delayed:1;
20 unsigned int flush_pending_idx:1;
21 unsigned int flush_running_idx:1;
22 unsigned long flush_pending_since;
23 struct list_head flush_queue[2];
24 struct list_head flush_data_in_flight;
25 struct request *flush_rq;
28 * flush_rq shares tag with this rq, both can't be active
31 struct request *orig_rq;
32 spinlock_t mq_flush_lock;
35 extern struct kmem_cache *blk_requestq_cachep;
36 extern struct kobj_type blk_queue_ktype;
37 extern struct ida blk_queue_ida;
39 static inline struct blk_flush_queue *
40 blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
42 return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
45 static inline void __blk_get_queue(struct request_queue *q)
47 kobject_get(&q->kobj);
50 struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
51 int node, int cmd_size, gfp_t flags);
52 void blk_free_flush_queue(struct blk_flush_queue *q);
54 void blk_freeze_queue(struct request_queue *q);
56 static inline void blk_queue_enter_live(struct request_queue *q)
59 * Given that running in generic_make_request() context
60 * guarantees that a live reference against q_usage_counter has
61 * been established, further references under that same context
62 * need not check that the queue has been frozen (marked dead).
64 percpu_ref_get(&q->q_usage_counter);
67 static inline bool biovec_phys_mergeable(struct request_queue *q,
68 struct bio_vec *vec1, struct bio_vec *vec2)
70 unsigned long mask = queue_segment_boundary(q);
71 phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
72 phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
74 if (addr1 + vec1->bv_len != addr2)
76 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
78 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
83 static inline bool __bvec_gap_to_prev(struct request_queue *q,
84 struct bio_vec *bprv, unsigned int offset)
86 return (offset & queue_virt_boundary(q)) ||
87 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
91 * Check if adding a bio_vec after bprv with offset would create a gap in
92 * the SG list. Most drivers don't care about this, but some do.
94 static inline bool bvec_gap_to_prev(struct request_queue *q,
95 struct bio_vec *bprv, unsigned int offset)
97 if (!queue_virt_boundary(q))
99 return __bvec_gap_to_prev(q, bprv, offset);
102 static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio,
103 unsigned int nr_segs)
105 rq->nr_phys_segments = nr_segs;
106 rq->__data_len = bio->bi_iter.bi_size;
107 rq->bio = rq->biotail = bio;
108 rq->ioprio = bio_prio(bio);
111 rq->rq_disk = bio->bi_disk;
114 #ifdef CONFIG_BLK_DEV_INTEGRITY
115 void blk_flush_integrity(void);
116 bool __bio_integrity_endio(struct bio *);
117 static inline bool bio_integrity_endio(struct bio *bio)
119 if (bio_integrity(bio))
120 return __bio_integrity_endio(bio);
124 static inline bool integrity_req_gap_back_merge(struct request *req,
127 struct bio_integrity_payload *bip = bio_integrity(req->bio);
128 struct bio_integrity_payload *bip_next = bio_integrity(next);
130 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
131 bip_next->bip_vec[0].bv_offset);
134 static inline bool integrity_req_gap_front_merge(struct request *req,
137 struct bio_integrity_payload *bip = bio_integrity(bio);
138 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
140 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
141 bip_next->bip_vec[0].bv_offset);
143 #else /* CONFIG_BLK_DEV_INTEGRITY */
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 #endif /* CONFIG_BLK_DEV_INTEGRITY */
164 unsigned long blk_rq_timeout(unsigned long timeout);
165 void blk_add_timer(struct request *req);
167 bool bio_attempt_front_merge(struct request *req, struct bio *bio,
168 unsigned int nr_segs);
169 bool bio_attempt_back_merge(struct request *req, struct bio *bio,
170 unsigned int nr_segs);
171 bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
173 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
174 unsigned int nr_segs, struct request **same_queue_rq);
176 void blk_account_io_start(struct request *req, bool new_io);
177 void blk_account_io_completion(struct request *req, unsigned int bytes);
178 void blk_account_io_done(struct request *req, u64 now);
181 * Internal elevator interface
183 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
185 void blk_insert_flush(struct request *rq);
187 void elevator_init_mq(struct request_queue *q);
188 int elevator_switch_mq(struct request_queue *q,
189 struct elevator_type *new_e);
190 void __elevator_exit(struct request_queue *, struct elevator_queue *);
191 int elv_register_queue(struct request_queue *q, bool uevent);
192 void elv_unregister_queue(struct request_queue *q);
194 static inline void elevator_exit(struct request_queue *q,
195 struct elevator_queue *e)
197 lockdep_assert_held(&q->sysfs_lock);
199 blk_mq_sched_free_requests(q);
200 __elevator_exit(q, e);
203 struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
205 #ifdef CONFIG_FAIL_IO_TIMEOUT
206 int blk_should_fake_timeout(struct request_queue *);
207 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
208 ssize_t part_timeout_store(struct device *, struct device_attribute *,
209 const char *, size_t);
211 static inline int blk_should_fake_timeout(struct request_queue *q)
217 void __blk_queue_split(struct request_queue *q, struct bio **bio,
218 unsigned int *nr_segs);
219 int ll_back_merge_fn(struct request *req, struct bio *bio,
220 unsigned int nr_segs);
221 int ll_front_merge_fn(struct request *req, struct bio *bio,
222 unsigned int nr_segs);
223 struct request *attempt_back_merge(struct request_queue *q, struct request *rq);
224 struct request *attempt_front_merge(struct request_queue *q, struct request *rq);
225 int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
226 struct request *next);
227 unsigned int blk_recalc_rq_segments(struct request *rq);
228 void blk_rq_set_mixed_merge(struct request *rq);
229 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
230 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);
232 int blk_dev_init(void);
235 * Contribute to IO statistics IFF:
237 * a) it's attached to a gendisk, and
238 * b) the queue had IO stats enabled when this request was started, and
239 * c) it's a file system request
241 static inline bool blk_do_io_stat(struct request *rq)
243 return rq->rq_disk &&
244 (rq->rq_flags & RQF_IO_STAT) &&
245 !blk_rq_is_passthrough(rq);
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 * Internal io_context interface
268 void get_io_context(struct io_context *ioc);
269 struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
270 struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
272 void ioc_clear_queue(struct request_queue *q);
274 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
277 * create_io_context - try to create task->io_context
278 * @gfp_mask: allocation mask
279 * @node: allocation node
281 * If %current->io_context is %NULL, allocate a new io_context and install
282 * it. Returns the current %current->io_context which may be %NULL if
285 * Note that this function can't be called with IRQ disabled because
286 * task_lock which protects %current->io_context is IRQ-unsafe.
288 static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
290 WARN_ON_ONCE(irqs_disabled());
291 if (unlikely(!current->io_context))
292 create_task_io_context(current, gfp_mask, node);
293 return current->io_context;
297 * Internal throttling interface
299 #ifdef CONFIG_BLK_DEV_THROTTLING
300 extern void blk_throtl_drain(struct request_queue *q);
301 extern int blk_throtl_init(struct request_queue *q);
302 extern void blk_throtl_exit(struct request_queue *q);
303 extern void blk_throtl_register_queue(struct request_queue *q);
304 #else /* CONFIG_BLK_DEV_THROTTLING */
305 static inline void blk_throtl_drain(struct request_queue *q) { }
306 static inline int blk_throtl_init(struct request_queue *q) { return 0; }
307 static inline void blk_throtl_exit(struct request_queue *q) { }
308 static inline void blk_throtl_register_queue(struct request_queue *q) { }
309 #endif /* CONFIG_BLK_DEV_THROTTLING */
310 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
311 extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
312 extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
313 const char *page, size_t count);
314 extern void blk_throtl_bio_endio(struct bio *bio);
315 extern void blk_throtl_stat_add(struct request *rq, u64 time);
317 static inline void blk_throtl_bio_endio(struct bio *bio) { }
318 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
322 extern int init_emergency_isa_pool(void);
323 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
325 static inline int init_emergency_isa_pool(void)
329 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
332 #endif /* CONFIG_BOUNCE */
334 #ifdef CONFIG_BLK_CGROUP_IOLATENCY
335 extern int blk_iolatency_init(struct request_queue *q);
337 static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
340 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
342 #ifdef CONFIG_BLK_DEV_ZONED
343 void blk_queue_free_zone_bitmaps(struct request_queue *q);
345 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
348 #endif /* BLK_INTERNAL_H */