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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; | |
8d699663 | 22 | blk_status_t rq_status; |
7c94e1c1 ML |
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; | |
0048b483 ML |
27 | |
28 | /* | |
29 | * flush_rq shares tag with this rq, both can't be active | |
30 | * at the same time | |
31 | */ | |
32 | struct request *orig_rq; | |
b3c6a599 | 33 | struct lock_class_key key; |
7c94e1c1 ML |
34 | spinlock_t mq_flush_lock; |
35 | }; | |
36 | ||
8324aa91 JA |
37 | extern struct kmem_cache *blk_requestq_cachep; |
38 | extern struct kobj_type blk_queue_ktype; | |
a73f730d | 39 | extern struct ida blk_queue_ida; |
8324aa91 | 40 | |
f9afca4d JA |
41 | static inline struct blk_flush_queue * |
42 | blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx) | |
7c94e1c1 | 43 | { |
8ccdf4a3 | 44 | return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq; |
7c94e1c1 ML |
45 | } |
46 | ||
09ac46c4 TH |
47 | static inline void __blk_get_queue(struct request_queue *q) |
48 | { | |
49 | kobject_get(&q->kobj); | |
50 | } | |
51 | ||
8d699663 YY |
52 | static inline bool |
53 | is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx) | |
54 | { | |
55 | return hctx->fq->flush_rq == req; | |
56 | } | |
57 | ||
f70ced09 | 58 | struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q, |
5b202853 | 59 | int node, int cmd_size, gfp_t flags); |
f70ced09 | 60 | void blk_free_flush_queue(struct blk_flush_queue *q); |
f3552655 | 61 | |
3ef28e83 DW |
62 | void blk_freeze_queue(struct request_queue *q); |
63 | ||
64 | static inline void blk_queue_enter_live(struct request_queue *q) | |
65 | { | |
66 | /* | |
67 | * Given that running in generic_make_request() context | |
68 | * guarantees that a live reference against q_usage_counter has | |
69 | * been established, further references under that same context | |
70 | * need not check that the queue has been frozen (marked dead). | |
71 | */ | |
72 | percpu_ref_get(&q->q_usage_counter); | |
73 | } | |
8324aa91 | 74 | |
3dccdae5 CH |
75 | static inline bool biovec_phys_mergeable(struct request_queue *q, |
76 | struct bio_vec *vec1, struct bio_vec *vec2) | |
6a9f5f24 | 77 | { |
3dccdae5 | 78 | unsigned long mask = queue_segment_boundary(q); |
6e768461 CH |
79 | phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset; |
80 | phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset; | |
3dccdae5 CH |
81 | |
82 | if (addr1 + vec1->bv_len != addr2) | |
6a9f5f24 | 83 | return false; |
0383ad43 | 84 | if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page)) |
6a9f5f24 | 85 | return false; |
3dccdae5 CH |
86 | if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask)) |
87 | return false; | |
6a9f5f24 CH |
88 | return true; |
89 | } | |
90 | ||
27ca1d4e CH |
91 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
92 | struct bio_vec *bprv, unsigned int offset) | |
93 | { | |
df376b2e | 94 | return (offset & queue_virt_boundary(q)) || |
27ca1d4e CH |
95 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); |
96 | } | |
97 | ||
98 | /* | |
99 | * Check if adding a bio_vec after bprv with offset would create a gap in | |
100 | * the SG list. Most drivers don't care about this, but some do. | |
101 | */ | |
102 | static inline bool bvec_gap_to_prev(struct request_queue *q, | |
103 | struct bio_vec *bprv, unsigned int offset) | |
104 | { | |
105 | if (!queue_virt_boundary(q)) | |
106 | return false; | |
107 | return __bvec_gap_to_prev(q, bprv, offset); | |
108 | } | |
109 | ||
1aa0a133 CH |
110 | static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio, |
111 | unsigned int nr_segs) | |
112 | { | |
113 | rq->nr_phys_segments = nr_segs; | |
114 | rq->__data_len = bio->bi_iter.bi_size; | |
115 | rq->bio = rq->biotail = bio; | |
116 | rq->ioprio = bio_prio(bio); | |
117 | ||
118 | if (bio->bi_disk) | |
119 | rq->rq_disk = bio->bi_disk; | |
120 | } | |
121 | ||
5a48fc14 DW |
122 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
123 | void blk_flush_integrity(void); | |
7c20f116 | 124 | bool __bio_integrity_endio(struct bio *); |
ece841ab | 125 | void bio_integrity_free(struct bio *bio); |
7c20f116 CH |
126 | static inline bool bio_integrity_endio(struct bio *bio) |
127 | { | |
128 | if (bio_integrity(bio)) | |
129 | return __bio_integrity_endio(bio); | |
130 | return true; | |
131 | } | |
43b729bf CH |
132 | |
133 | static inline bool integrity_req_gap_back_merge(struct request *req, | |
134 | struct bio *next) | |
135 | { | |
136 | struct bio_integrity_payload *bip = bio_integrity(req->bio); | |
137 | struct bio_integrity_payload *bip_next = bio_integrity(next); | |
138 | ||
139 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
140 | bip_next->bip_vec[0].bv_offset); | |
141 | } | |
142 | ||
143 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
144 | struct bio *bio) | |
145 | { | |
146 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
147 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); | |
148 | ||
149 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
150 | bip_next->bip_vec[0].bv_offset); | |
151 | } | |
152 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
153 | static inline bool integrity_req_gap_back_merge(struct request *req, | |
154 | struct bio *next) | |
155 | { | |
156 | return false; | |
157 | } | |
158 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
159 | struct bio *bio) | |
160 | { | |
161 | return false; | |
162 | } | |
163 | ||
5a48fc14 DW |
164 | static inline void blk_flush_integrity(void) |
165 | { | |
166 | } | |
7c20f116 CH |
167 | static inline bool bio_integrity_endio(struct bio *bio) |
168 | { | |
169 | return true; | |
170 | } | |
ece841ab JT |
171 | static inline void bio_integrity_free(struct bio *bio) |
172 | { | |
173 | } | |
43b729bf | 174 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
8324aa91 | 175 | |
0d2602ca | 176 | unsigned long blk_rq_timeout(unsigned long timeout); |
87ee7b11 | 177 | void blk_add_timer(struct request *req); |
320ae51f | 178 | |
14ccb66b CH |
179 | bool bio_attempt_front_merge(struct request *req, struct bio *bio, |
180 | unsigned int nr_segs); | |
181 | bool bio_attempt_back_merge(struct request *req, struct bio *bio, | |
182 | unsigned int nr_segs); | |
1e739730 CH |
183 | bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, |
184 | struct bio *bio); | |
320ae51f | 185 | bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, |
14ccb66b | 186 | unsigned int nr_segs, struct request **same_queue_rq); |
320ae51f JA |
187 | |
188 | void blk_account_io_start(struct request *req, bool new_io); | |
189 | void blk_account_io_completion(struct request *req, unsigned int bytes); | |
522a7775 | 190 | void blk_account_io_done(struct request *req, u64 now); |
320ae51f | 191 | |
158dbda0 TH |
192 | /* |
193 | * Internal elevator interface | |
194 | */ | |
e8064021 | 195 | #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) |
158dbda0 | 196 | |
ae1b1539 | 197 | void blk_insert_flush(struct request *rq); |
dd831006 | 198 | |
954b4a5c | 199 | void elevator_init_mq(struct request_queue *q); |
d48ece20 JW |
200 | int elevator_switch_mq(struct request_queue *q, |
201 | struct elevator_type *new_e); | |
c3e22192 | 202 | void __elevator_exit(struct request_queue *, struct elevator_queue *); |
cecf5d87 | 203 | int elv_register_queue(struct request_queue *q, bool uevent); |
83d016ac BVA |
204 | void elv_unregister_queue(struct request_queue *q); |
205 | ||
c3e22192 ML |
206 | static inline void elevator_exit(struct request_queue *q, |
207 | struct elevator_queue *e) | |
208 | { | |
284b94be ML |
209 | lockdep_assert_held(&q->sysfs_lock); |
210 | ||
c3e22192 ML |
211 | blk_mq_sched_free_requests(q); |
212 | __elevator_exit(q, e); | |
213 | } | |
214 | ||
807d4af2 CH |
215 | struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
216 | ||
581d4e28 JA |
217 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
218 | int blk_should_fake_timeout(struct request_queue *); | |
219 | ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); | |
220 | ssize_t part_timeout_store(struct device *, struct device_attribute *, | |
221 | const char *, size_t); | |
222 | #else | |
223 | static inline int blk_should_fake_timeout(struct request_queue *q) | |
224 | { | |
225 | return 0; | |
226 | } | |
227 | #endif | |
228 | ||
14ccb66b CH |
229 | void __blk_queue_split(struct request_queue *q, struct bio **bio, |
230 | unsigned int *nr_segs); | |
231 | int ll_back_merge_fn(struct request *req, struct bio *bio, | |
232 | unsigned int nr_segs); | |
233 | int ll_front_merge_fn(struct request *req, struct bio *bio, | |
234 | unsigned int nr_segs); | |
b973cb7e JA |
235 | struct request *attempt_back_merge(struct request_queue *q, struct request *rq); |
236 | struct request *attempt_front_merge(struct request_queue *q, struct request *rq); | |
5e84ea3a JA |
237 | int blk_attempt_req_merge(struct request_queue *q, struct request *rq, |
238 | struct request *next); | |
e9cd19c0 | 239 | unsigned int blk_recalc_rq_segments(struct request *rq); |
80a761fd | 240 | void blk_rq_set_mixed_merge(struct request *rq); |
050c8ea8 | 241 | bool blk_rq_merge_ok(struct request *rq, struct bio *bio); |
34fe7c05 | 242 | enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); |
d6d48196 | 243 | |
ff88972c AB |
244 | int blk_dev_init(void); |
245 | ||
c2553b58 JA |
246 | /* |
247 | * Contribute to IO statistics IFF: | |
248 | * | |
249 | * a) it's attached to a gendisk, and | |
48d9b0d4 | 250 | * b) the queue had IO stats enabled when this request was started |
c2553b58 | 251 | */ |
599d067d | 252 | static inline bool blk_do_io_stat(struct request *rq) |
fb8ec18c | 253 | { |
48d9b0d4 | 254 | return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT); |
fb8ec18c JA |
255 | } |
256 | ||
6cf7677f CH |
257 | static inline void req_set_nomerge(struct request_queue *q, struct request *req) |
258 | { | |
259 | req->cmd_flags |= REQ_NOMERGE; | |
260 | if (req == q->last_merge) | |
261 | q->last_merge = NULL; | |
262 | } | |
263 | ||
1adfc5e4 ML |
264 | /* |
265 | * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size | |
266 | * is defined as 'unsigned int', meantime it has to aligned to with logical | |
267 | * block size which is the minimum accepted unit by hardware. | |
268 | */ | |
269 | static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) | |
270 | { | |
271 | return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9; | |
272 | } | |
273 | ||
f2dbd76a TH |
274 | /* |
275 | * Internal io_context interface | |
276 | */ | |
277 | void get_io_context(struct io_context *ioc); | |
47fdd4ca | 278 | struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q); |
24acfc34 TH |
279 | struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, |
280 | gfp_t gfp_mask); | |
7e5a8794 | 281 | void ioc_clear_queue(struct request_queue *q); |
f2dbd76a | 282 | |
24acfc34 | 283 | int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); |
f2dbd76a TH |
284 | |
285 | /** | |
286 | * create_io_context - try to create task->io_context | |
f2dbd76a TH |
287 | * @gfp_mask: allocation mask |
288 | * @node: allocation node | |
289 | * | |
24acfc34 TH |
290 | * If %current->io_context is %NULL, allocate a new io_context and install |
291 | * it. Returns the current %current->io_context which may be %NULL if | |
292 | * allocation failed. | |
f2dbd76a TH |
293 | * |
294 | * Note that this function can't be called with IRQ disabled because | |
24acfc34 | 295 | * task_lock which protects %current->io_context is IRQ-unsafe. |
f2dbd76a | 296 | */ |
24acfc34 | 297 | static inline struct io_context *create_io_context(gfp_t gfp_mask, int node) |
f2dbd76a TH |
298 | { |
299 | WARN_ON_ONCE(irqs_disabled()); | |
24acfc34 TH |
300 | if (unlikely(!current->io_context)) |
301 | create_task_io_context(current, gfp_mask, node); | |
302 | return current->io_context; | |
f2dbd76a TH |
303 | } |
304 | ||
305 | /* | |
306 | * Internal throttling interface | |
307 | */ | |
bc9fcbf9 | 308 | #ifdef CONFIG_BLK_DEV_THROTTLING |
c9a929dd | 309 | extern void blk_throtl_drain(struct request_queue *q); |
bc9fcbf9 TH |
310 | extern int blk_throtl_init(struct request_queue *q); |
311 | extern void blk_throtl_exit(struct request_queue *q); | |
d61fcfa4 | 312 | extern void blk_throtl_register_queue(struct request_queue *q); |
bc9fcbf9 | 313 | #else /* CONFIG_BLK_DEV_THROTTLING */ |
c9a929dd | 314 | static inline void blk_throtl_drain(struct request_queue *q) { } |
bc9fcbf9 TH |
315 | static inline int blk_throtl_init(struct request_queue *q) { return 0; } |
316 | static inline void blk_throtl_exit(struct request_queue *q) { } | |
d61fcfa4 | 317 | static inline void blk_throtl_register_queue(struct request_queue *q) { } |
bc9fcbf9 | 318 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
297e3d85 SL |
319 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
320 | extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page); | |
321 | extern ssize_t blk_throtl_sample_time_store(struct request_queue *q, | |
322 | const char *page, size_t count); | |
9e234eea | 323 | extern void blk_throtl_bio_endio(struct bio *bio); |
b9147dd1 | 324 | extern void blk_throtl_stat_add(struct request *rq, u64 time); |
9e234eea SL |
325 | #else |
326 | static inline void blk_throtl_bio_endio(struct bio *bio) { } | |
b9147dd1 | 327 | static inline void blk_throtl_stat_add(struct request *rq, u64 time) { } |
297e3d85 | 328 | #endif |
bc9fcbf9 | 329 | |
3bce016a CH |
330 | #ifdef CONFIG_BOUNCE |
331 | extern int init_emergency_isa_pool(void); | |
332 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); | |
333 | #else | |
334 | static inline int init_emergency_isa_pool(void) | |
335 | { | |
336 | return 0; | |
337 | } | |
338 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) | |
339 | { | |
340 | } | |
341 | #endif /* CONFIG_BOUNCE */ | |
342 | ||
d7067512 JB |
343 | #ifdef CONFIG_BLK_CGROUP_IOLATENCY |
344 | extern int blk_iolatency_init(struct request_queue *q); | |
345 | #else | |
346 | static inline int blk_iolatency_init(struct request_queue *q) { return 0; } | |
347 | #endif | |
348 | ||
a2d6b3a2 DLM |
349 | struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp); |
350 | ||
bf505456 DLM |
351 | #ifdef CONFIG_BLK_DEV_ZONED |
352 | void blk_queue_free_zone_bitmaps(struct request_queue *q); | |
353 | #else | |
354 | static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {} | |
355 | #endif | |
356 | ||
bc9fcbf9 | 357 | #endif /* BLK_INTERNAL_H */ |