Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
8324aa91 JA |
2 | #ifndef BLK_INTERNAL_H |
3 | #define BLK_INTERNAL_H | |
4 | ||
a73f730d | 5 | #include <linux/idr.h> |
f70ced09 | 6 | #include <linux/blk-mq.h> |
c39ae60d | 7 | #include <xen/xen.h> |
f70ced09 | 8 | #include "blk-mq.h" |
c3e22192 | 9 | #include "blk-mq-sched.h" |
a73f730d | 10 | |
0d2602ca JA |
11 | /* Max future timer expiry for timeouts */ |
12 | #define BLK_MAX_TIMEOUT (5 * HZ) | |
13 | ||
18fbda91 OS |
14 | #ifdef CONFIG_DEBUG_FS |
15 | extern struct dentry *blk_debugfs_root; | |
16 | #endif | |
17 | ||
7c94e1c1 ML |
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; | |
0048b483 ML |
26 | |
27 | /* | |
28 | * flush_rq shares tag with this rq, both can't be active | |
29 | * at the same time | |
30 | */ | |
31 | struct request *orig_rq; | |
7c94e1c1 ML |
32 | spinlock_t mq_flush_lock; |
33 | }; | |
34 | ||
8324aa91 JA |
35 | extern struct kmem_cache *blk_requestq_cachep; |
36 | extern struct kobj_type blk_queue_ktype; | |
a73f730d | 37 | extern struct ida blk_queue_ida; |
8324aa91 | 38 | |
f9afca4d JA |
39 | static inline struct blk_flush_queue * |
40 | blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx) | |
7c94e1c1 | 41 | { |
8ccdf4a3 | 42 | return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq; |
7c94e1c1 ML |
43 | } |
44 | ||
09ac46c4 TH |
45 | static inline void __blk_get_queue(struct request_queue *q) |
46 | { | |
47 | kobject_get(&q->kobj); | |
48 | } | |
49 | ||
f70ced09 | 50 | struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q, |
5b202853 | 51 | int node, int cmd_size, gfp_t flags); |
f70ced09 | 52 | void blk_free_flush_queue(struct blk_flush_queue *q); |
f3552655 | 53 | |
3ef28e83 DW |
54 | void blk_freeze_queue(struct request_queue *q); |
55 | ||
56 | static inline void blk_queue_enter_live(struct request_queue *q) | |
57 | { | |
58 | /* | |
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). | |
63 | */ | |
64 | percpu_ref_get(&q->q_usage_counter); | |
65 | } | |
8324aa91 | 66 | |
3dccdae5 CH |
67 | static inline bool biovec_phys_mergeable(struct request_queue *q, |
68 | struct bio_vec *vec1, struct bio_vec *vec2) | |
6a9f5f24 | 69 | { |
3dccdae5 | 70 | unsigned long mask = queue_segment_boundary(q); |
6e768461 CH |
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; | |
3dccdae5 CH |
73 | |
74 | if (addr1 + vec1->bv_len != addr2) | |
6a9f5f24 | 75 | return false; |
0383ad43 | 76 | if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page)) |
6a9f5f24 | 77 | return false; |
3dccdae5 CH |
78 | if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask)) |
79 | return false; | |
6a9f5f24 CH |
80 | return true; |
81 | } | |
82 | ||
27ca1d4e CH |
83 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
84 | struct bio_vec *bprv, unsigned int offset) | |
85 | { | |
df376b2e | 86 | return (offset & queue_virt_boundary(q)) || |
27ca1d4e CH |
87 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); |
88 | } | |
89 | ||
90 | /* | |
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. | |
93 | */ | |
94 | static inline bool bvec_gap_to_prev(struct request_queue *q, | |
95 | struct bio_vec *bprv, unsigned int offset) | |
96 | { | |
97 | if (!queue_virt_boundary(q)) | |
98 | return false; | |
99 | return __bvec_gap_to_prev(q, bprv, offset); | |
100 | } | |
101 | ||
1aa0a133 CH |
102 | static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio, |
103 | unsigned int nr_segs) | |
104 | { | |
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); | |
109 | ||
110 | if (bio->bi_disk) | |
111 | rq->rq_disk = bio->bi_disk; | |
112 | } | |
113 | ||
5a48fc14 DW |
114 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
115 | void blk_flush_integrity(void); | |
7c20f116 CH |
116 | bool __bio_integrity_endio(struct bio *); |
117 | static inline bool bio_integrity_endio(struct bio *bio) | |
118 | { | |
119 | if (bio_integrity(bio)) | |
120 | return __bio_integrity_endio(bio); | |
121 | return true; | |
122 | } | |
43b729bf CH |
123 | |
124 | static inline bool integrity_req_gap_back_merge(struct request *req, | |
125 | struct bio *next) | |
126 | { | |
127 | struct bio_integrity_payload *bip = bio_integrity(req->bio); | |
128 | struct bio_integrity_payload *bip_next = bio_integrity(next); | |
129 | ||
130 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
131 | bip_next->bip_vec[0].bv_offset); | |
132 | } | |
133 | ||
134 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
135 | struct bio *bio) | |
136 | { | |
137 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
138 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); | |
139 | ||
140 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
141 | bip_next->bip_vec[0].bv_offset); | |
142 | } | |
143 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
144 | static inline bool integrity_req_gap_back_merge(struct request *req, | |
145 | struct bio *next) | |
146 | { | |
147 | return false; | |
148 | } | |
149 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
150 | struct bio *bio) | |
151 | { | |
152 | return false; | |
153 | } | |
154 | ||
5a48fc14 DW |
155 | static inline void blk_flush_integrity(void) |
156 | { | |
157 | } | |
7c20f116 CH |
158 | static inline bool bio_integrity_endio(struct bio *bio) |
159 | { | |
160 | return true; | |
161 | } | |
43b729bf | 162 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
8324aa91 | 163 | |
0d2602ca | 164 | unsigned long blk_rq_timeout(unsigned long timeout); |
87ee7b11 | 165 | void blk_add_timer(struct request *req); |
320ae51f | 166 | |
14ccb66b CH |
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); | |
1e739730 CH |
171 | bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, |
172 | struct bio *bio); | |
320ae51f | 173 | bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, |
14ccb66b | 174 | unsigned int nr_segs, struct request **same_queue_rq); |
320ae51f JA |
175 | |
176 | void blk_account_io_start(struct request *req, bool new_io); | |
177 | void blk_account_io_completion(struct request *req, unsigned int bytes); | |
522a7775 | 178 | void blk_account_io_done(struct request *req, u64 now); |
320ae51f | 179 | |
158dbda0 TH |
180 | /* |
181 | * Internal elevator interface | |
182 | */ | |
e8064021 | 183 | #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) |
158dbda0 | 184 | |
ae1b1539 | 185 | void blk_insert_flush(struct request *rq); |
dd831006 | 186 | |
131d08e1 | 187 | int elevator_init_mq(struct request_queue *q); |
d48ece20 JW |
188 | int elevator_switch_mq(struct request_queue *q, |
189 | struct elevator_type *new_e); | |
c3e22192 | 190 | void __elevator_exit(struct request_queue *, struct elevator_queue *); |
83d016ac BVA |
191 | int elv_register_queue(struct request_queue *q); |
192 | void elv_unregister_queue(struct request_queue *q); | |
193 | ||
c3e22192 ML |
194 | static inline void elevator_exit(struct request_queue *q, |
195 | struct elevator_queue *e) | |
196 | { | |
197 | blk_mq_sched_free_requests(q); | |
198 | __elevator_exit(q, e); | |
199 | } | |
200 | ||
807d4af2 CH |
201 | struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
202 | ||
581d4e28 JA |
203 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
204 | int blk_should_fake_timeout(struct request_queue *); | |
205 | ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); | |
206 | ssize_t part_timeout_store(struct device *, struct device_attribute *, | |
207 | const char *, size_t); | |
208 | #else | |
209 | static inline int blk_should_fake_timeout(struct request_queue *q) | |
210 | { | |
211 | return 0; | |
212 | } | |
213 | #endif | |
214 | ||
14ccb66b CH |
215 | void __blk_queue_split(struct request_queue *q, struct bio **bio, |
216 | unsigned int *nr_segs); | |
217 | int ll_back_merge_fn(struct request *req, struct bio *bio, | |
218 | unsigned int nr_segs); | |
219 | int ll_front_merge_fn(struct request *req, struct bio *bio, | |
220 | unsigned int nr_segs); | |
b973cb7e JA |
221 | struct request *attempt_back_merge(struct request_queue *q, struct request *rq); |
222 | struct request *attempt_front_merge(struct request_queue *q, struct request *rq); | |
5e84ea3a JA |
223 | int blk_attempt_req_merge(struct request_queue *q, struct request *rq, |
224 | struct request *next); | |
e9cd19c0 | 225 | unsigned int blk_recalc_rq_segments(struct request *rq); |
80a761fd | 226 | void blk_rq_set_mixed_merge(struct request *rq); |
050c8ea8 | 227 | bool blk_rq_merge_ok(struct request *rq, struct bio *bio); |
34fe7c05 | 228 | enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); |
d6d48196 | 229 | |
ff88972c AB |
230 | int blk_dev_init(void); |
231 | ||
c2553b58 JA |
232 | /* |
233 | * Contribute to IO statistics IFF: | |
234 | * | |
235 | * a) it's attached to a gendisk, and | |
236 | * b) the queue had IO stats enabled when this request was started, and | |
e2a60da7 | 237 | * c) it's a file system request |
c2553b58 | 238 | */ |
599d067d | 239 | static inline bool blk_do_io_stat(struct request *rq) |
fb8ec18c | 240 | { |
33659ebb | 241 | return rq->rq_disk && |
e8064021 | 242 | (rq->rq_flags & RQF_IO_STAT) && |
57292b58 | 243 | !blk_rq_is_passthrough(rq); |
fb8ec18c JA |
244 | } |
245 | ||
6cf7677f CH |
246 | static inline void req_set_nomerge(struct request_queue *q, struct request *req) |
247 | { | |
248 | req->cmd_flags |= REQ_NOMERGE; | |
249 | if (req == q->last_merge) | |
250 | q->last_merge = NULL; | |
251 | } | |
252 | ||
1adfc5e4 ML |
253 | /* |
254 | * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size | |
255 | * is defined as 'unsigned int', meantime it has to aligned to with logical | |
256 | * block size which is the minimum accepted unit by hardware. | |
257 | */ | |
258 | static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) | |
259 | { | |
260 | return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9; | |
261 | } | |
262 | ||
f2dbd76a TH |
263 | /* |
264 | * Internal io_context interface | |
265 | */ | |
266 | void get_io_context(struct io_context *ioc); | |
47fdd4ca | 267 | struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q); |
24acfc34 TH |
268 | struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, |
269 | gfp_t gfp_mask); | |
7e5a8794 | 270 | void ioc_clear_queue(struct request_queue *q); |
f2dbd76a | 271 | |
24acfc34 | 272 | int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); |
f2dbd76a TH |
273 | |
274 | /** | |
275 | * create_io_context - try to create task->io_context | |
f2dbd76a TH |
276 | * @gfp_mask: allocation mask |
277 | * @node: allocation node | |
278 | * | |
24acfc34 TH |
279 | * If %current->io_context is %NULL, allocate a new io_context and install |
280 | * it. Returns the current %current->io_context which may be %NULL if | |
281 | * allocation failed. | |
f2dbd76a TH |
282 | * |
283 | * Note that this function can't be called with IRQ disabled because | |
24acfc34 | 284 | * task_lock which protects %current->io_context is IRQ-unsafe. |
f2dbd76a | 285 | */ |
24acfc34 | 286 | static inline struct io_context *create_io_context(gfp_t gfp_mask, int node) |
f2dbd76a TH |
287 | { |
288 | WARN_ON_ONCE(irqs_disabled()); | |
24acfc34 TH |
289 | if (unlikely(!current->io_context)) |
290 | create_task_io_context(current, gfp_mask, node); | |
291 | return current->io_context; | |
f2dbd76a TH |
292 | } |
293 | ||
294 | /* | |
295 | * Internal throttling interface | |
296 | */ | |
bc9fcbf9 | 297 | #ifdef CONFIG_BLK_DEV_THROTTLING |
c9a929dd | 298 | extern void blk_throtl_drain(struct request_queue *q); |
bc9fcbf9 TH |
299 | extern int blk_throtl_init(struct request_queue *q); |
300 | extern void blk_throtl_exit(struct request_queue *q); | |
d61fcfa4 | 301 | extern void blk_throtl_register_queue(struct request_queue *q); |
bc9fcbf9 | 302 | #else /* CONFIG_BLK_DEV_THROTTLING */ |
c9a929dd | 303 | static inline void blk_throtl_drain(struct request_queue *q) { } |
bc9fcbf9 TH |
304 | static inline int blk_throtl_init(struct request_queue *q) { return 0; } |
305 | static inline void blk_throtl_exit(struct request_queue *q) { } | |
d61fcfa4 | 306 | static inline void blk_throtl_register_queue(struct request_queue *q) { } |
bc9fcbf9 | 307 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
297e3d85 SL |
308 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
309 | extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page); | |
310 | extern ssize_t blk_throtl_sample_time_store(struct request_queue *q, | |
311 | const char *page, size_t count); | |
9e234eea | 312 | extern void blk_throtl_bio_endio(struct bio *bio); |
b9147dd1 | 313 | extern void blk_throtl_stat_add(struct request *rq, u64 time); |
9e234eea SL |
314 | #else |
315 | static inline void blk_throtl_bio_endio(struct bio *bio) { } | |
b9147dd1 | 316 | static inline void blk_throtl_stat_add(struct request *rq, u64 time) { } |
297e3d85 | 317 | #endif |
bc9fcbf9 | 318 | |
3bce016a CH |
319 | #ifdef CONFIG_BOUNCE |
320 | extern int init_emergency_isa_pool(void); | |
321 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); | |
322 | #else | |
323 | static inline int init_emergency_isa_pool(void) | |
324 | { | |
325 | return 0; | |
326 | } | |
327 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) | |
328 | { | |
329 | } | |
330 | #endif /* CONFIG_BOUNCE */ | |
331 | ||
d7067512 JB |
332 | #ifdef CONFIG_BLK_CGROUP_IOLATENCY |
333 | extern int blk_iolatency_init(struct request_queue *q); | |
334 | #else | |
335 | static inline int blk_iolatency_init(struct request_queue *q) { return 0; } | |
336 | #endif | |
337 | ||
a2d6b3a2 DLM |
338 | struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp); |
339 | ||
bf505456 DLM |
340 | #ifdef CONFIG_BLK_DEV_ZONED |
341 | void blk_queue_free_zone_bitmaps(struct request_queue *q); | |
342 | #else | |
343 | static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {} | |
344 | #endif | |
345 | ||
bc9fcbf9 | 346 | #endif /* BLK_INTERNAL_H */ |