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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 | |
86db1e29 JA |
54 | void blk_rq_bio_prep(struct request_queue *q, struct request *rq, |
55 | struct bio *bio); | |
3ef28e83 DW |
56 | void blk_freeze_queue(struct request_queue *q); |
57 | ||
58 | static inline void blk_queue_enter_live(struct request_queue *q) | |
59 | { | |
60 | /* | |
61 | * Given that running in generic_make_request() context | |
62 | * guarantees that a live reference against q_usage_counter has | |
63 | * been established, further references under that same context | |
64 | * need not check that the queue has been frozen (marked dead). | |
65 | */ | |
66 | percpu_ref_get(&q->q_usage_counter); | |
67 | } | |
8324aa91 | 68 | |
3dccdae5 CH |
69 | static inline bool biovec_phys_mergeable(struct request_queue *q, |
70 | struct bio_vec *vec1, struct bio_vec *vec2) | |
6a9f5f24 | 71 | { |
3dccdae5 | 72 | unsigned long mask = queue_segment_boundary(q); |
6e768461 CH |
73 | phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset; |
74 | phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset; | |
3dccdae5 CH |
75 | |
76 | if (addr1 + vec1->bv_len != addr2) | |
6a9f5f24 | 77 | return false; |
0383ad43 | 78 | if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page)) |
6a9f5f24 | 79 | return false; |
3dccdae5 CH |
80 | if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask)) |
81 | return false; | |
6a9f5f24 CH |
82 | return true; |
83 | } | |
84 | ||
27ca1d4e CH |
85 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
86 | struct bio_vec *bprv, unsigned int offset) | |
87 | { | |
df376b2e | 88 | return (offset & queue_virt_boundary(q)) || |
27ca1d4e CH |
89 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); |
90 | } | |
91 | ||
92 | /* | |
93 | * Check if adding a bio_vec after bprv with offset would create a gap in | |
94 | * the SG list. Most drivers don't care about this, but some do. | |
95 | */ | |
96 | static inline bool bvec_gap_to_prev(struct request_queue *q, | |
97 | struct bio_vec *bprv, unsigned int offset) | |
98 | { | |
99 | if (!queue_virt_boundary(q)) | |
100 | return false; | |
101 | return __bvec_gap_to_prev(q, bprv, offset); | |
102 | } | |
103 | ||
5a48fc14 DW |
104 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
105 | void blk_flush_integrity(void); | |
7c20f116 CH |
106 | bool __bio_integrity_endio(struct bio *); |
107 | static inline bool bio_integrity_endio(struct bio *bio) | |
108 | { | |
109 | if (bio_integrity(bio)) | |
110 | return __bio_integrity_endio(bio); | |
111 | return true; | |
112 | } | |
43b729bf CH |
113 | |
114 | static inline bool integrity_req_gap_back_merge(struct request *req, | |
115 | struct bio *next) | |
116 | { | |
117 | struct bio_integrity_payload *bip = bio_integrity(req->bio); | |
118 | struct bio_integrity_payload *bip_next = bio_integrity(next); | |
119 | ||
120 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
121 | bip_next->bip_vec[0].bv_offset); | |
122 | } | |
123 | ||
124 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
125 | struct bio *bio) | |
126 | { | |
127 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
128 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); | |
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 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
134 | static inline bool integrity_req_gap_back_merge(struct request *req, | |
135 | struct bio *next) | |
136 | { | |
137 | return false; | |
138 | } | |
139 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
140 | struct bio *bio) | |
141 | { | |
142 | return false; | |
143 | } | |
144 | ||
5a48fc14 DW |
145 | static inline void blk_flush_integrity(void) |
146 | { | |
147 | } | |
7c20f116 CH |
148 | static inline bool bio_integrity_endio(struct bio *bio) |
149 | { | |
150 | return true; | |
151 | } | |
43b729bf | 152 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
8324aa91 | 153 | |
0d2602ca | 154 | unsigned long blk_rq_timeout(unsigned long timeout); |
87ee7b11 | 155 | void blk_add_timer(struct request *req); |
320ae51f JA |
156 | |
157 | bool bio_attempt_front_merge(struct request_queue *q, struct request *req, | |
158 | struct bio *bio); | |
159 | bool bio_attempt_back_merge(struct request_queue *q, struct request *req, | |
160 | struct bio *bio); | |
1e739730 CH |
161 | bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, |
162 | struct bio *bio); | |
320ae51f | 163 | bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, |
5b3f341f | 164 | struct request **same_queue_rq); |
320ae51f JA |
165 | |
166 | void blk_account_io_start(struct request *req, bool new_io); | |
167 | void blk_account_io_completion(struct request *req, unsigned int bytes); | |
522a7775 | 168 | void blk_account_io_done(struct request *req, u64 now); |
320ae51f | 169 | |
158dbda0 TH |
170 | /* |
171 | * Internal elevator interface | |
172 | */ | |
e8064021 | 173 | #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) |
158dbda0 | 174 | |
ae1b1539 | 175 | void blk_insert_flush(struct request *rq); |
dd831006 | 176 | |
131d08e1 | 177 | int elevator_init_mq(struct request_queue *q); |
d48ece20 JW |
178 | int elevator_switch_mq(struct request_queue *q, |
179 | struct elevator_type *new_e); | |
c3e22192 | 180 | void __elevator_exit(struct request_queue *, struct elevator_queue *); |
83d016ac BVA |
181 | int elv_register_queue(struct request_queue *q); |
182 | void elv_unregister_queue(struct request_queue *q); | |
183 | ||
c3e22192 ML |
184 | static inline void elevator_exit(struct request_queue *q, |
185 | struct elevator_queue *e) | |
186 | { | |
187 | blk_mq_sched_free_requests(q); | |
188 | __elevator_exit(q, e); | |
189 | } | |
190 | ||
807d4af2 CH |
191 | struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
192 | ||
581d4e28 JA |
193 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
194 | int blk_should_fake_timeout(struct request_queue *); | |
195 | ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); | |
196 | ssize_t part_timeout_store(struct device *, struct device_attribute *, | |
197 | const char *, size_t); | |
198 | #else | |
199 | static inline int blk_should_fake_timeout(struct request_queue *q) | |
200 | { | |
201 | return 0; | |
202 | } | |
203 | #endif | |
204 | ||
d6d48196 JA |
205 | int ll_back_merge_fn(struct request_queue *q, struct request *req, |
206 | struct bio *bio); | |
207 | int ll_front_merge_fn(struct request_queue *q, struct request *req, | |
208 | struct bio *bio); | |
b973cb7e JA |
209 | struct request *attempt_back_merge(struct request_queue *q, struct request *rq); |
210 | struct request *attempt_front_merge(struct request_queue *q, struct request *rq); | |
5e84ea3a JA |
211 | int blk_attempt_req_merge(struct request_queue *q, struct request *rq, |
212 | struct request *next); | |
d6d48196 | 213 | void blk_recalc_rq_segments(struct request *rq); |
80a761fd | 214 | void blk_rq_set_mixed_merge(struct request *rq); |
050c8ea8 | 215 | bool blk_rq_merge_ok(struct request *rq, struct bio *bio); |
34fe7c05 | 216 | enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); |
d6d48196 | 217 | |
ff88972c AB |
218 | int blk_dev_init(void); |
219 | ||
c2553b58 JA |
220 | /* |
221 | * Contribute to IO statistics IFF: | |
222 | * | |
223 | * a) it's attached to a gendisk, and | |
224 | * b) the queue had IO stats enabled when this request was started, and | |
e2a60da7 | 225 | * c) it's a file system request |
c2553b58 | 226 | */ |
599d067d | 227 | static inline bool blk_do_io_stat(struct request *rq) |
fb8ec18c | 228 | { |
33659ebb | 229 | return rq->rq_disk && |
e8064021 | 230 | (rq->rq_flags & RQF_IO_STAT) && |
57292b58 | 231 | !blk_rq_is_passthrough(rq); |
fb8ec18c JA |
232 | } |
233 | ||
6cf7677f CH |
234 | static inline void req_set_nomerge(struct request_queue *q, struct request *req) |
235 | { | |
236 | req->cmd_flags |= REQ_NOMERGE; | |
237 | if (req == q->last_merge) | |
238 | q->last_merge = NULL; | |
239 | } | |
240 | ||
1adfc5e4 ML |
241 | /* |
242 | * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size | |
243 | * is defined as 'unsigned int', meantime it has to aligned to with logical | |
244 | * block size which is the minimum accepted unit by hardware. | |
245 | */ | |
246 | static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) | |
247 | { | |
248 | return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9; | |
249 | } | |
250 | ||
f2dbd76a TH |
251 | /* |
252 | * Internal io_context interface | |
253 | */ | |
254 | void get_io_context(struct io_context *ioc); | |
47fdd4ca | 255 | struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q); |
24acfc34 TH |
256 | struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, |
257 | gfp_t gfp_mask); | |
7e5a8794 | 258 | void ioc_clear_queue(struct request_queue *q); |
f2dbd76a | 259 | |
24acfc34 | 260 | int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); |
f2dbd76a TH |
261 | |
262 | /** | |
263 | * create_io_context - try to create task->io_context | |
f2dbd76a TH |
264 | * @gfp_mask: allocation mask |
265 | * @node: allocation node | |
266 | * | |
24acfc34 TH |
267 | * If %current->io_context is %NULL, allocate a new io_context and install |
268 | * it. Returns the current %current->io_context which may be %NULL if | |
269 | * allocation failed. | |
f2dbd76a TH |
270 | * |
271 | * Note that this function can't be called with IRQ disabled because | |
24acfc34 | 272 | * task_lock which protects %current->io_context is IRQ-unsafe. |
f2dbd76a | 273 | */ |
24acfc34 | 274 | static inline struct io_context *create_io_context(gfp_t gfp_mask, int node) |
f2dbd76a TH |
275 | { |
276 | WARN_ON_ONCE(irqs_disabled()); | |
24acfc34 TH |
277 | if (unlikely(!current->io_context)) |
278 | create_task_io_context(current, gfp_mask, node); | |
279 | return current->io_context; | |
f2dbd76a TH |
280 | } |
281 | ||
282 | /* | |
283 | * Internal throttling interface | |
284 | */ | |
bc9fcbf9 | 285 | #ifdef CONFIG_BLK_DEV_THROTTLING |
c9a929dd | 286 | extern void blk_throtl_drain(struct request_queue *q); |
bc9fcbf9 TH |
287 | extern int blk_throtl_init(struct request_queue *q); |
288 | extern void blk_throtl_exit(struct request_queue *q); | |
d61fcfa4 | 289 | extern void blk_throtl_register_queue(struct request_queue *q); |
bc9fcbf9 | 290 | #else /* CONFIG_BLK_DEV_THROTTLING */ |
c9a929dd | 291 | static inline void blk_throtl_drain(struct request_queue *q) { } |
bc9fcbf9 TH |
292 | static inline int blk_throtl_init(struct request_queue *q) { return 0; } |
293 | static inline void blk_throtl_exit(struct request_queue *q) { } | |
d61fcfa4 | 294 | static inline void blk_throtl_register_queue(struct request_queue *q) { } |
bc9fcbf9 | 295 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
297e3d85 SL |
296 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
297 | extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page); | |
298 | extern ssize_t blk_throtl_sample_time_store(struct request_queue *q, | |
299 | const char *page, size_t count); | |
9e234eea | 300 | extern void blk_throtl_bio_endio(struct bio *bio); |
b9147dd1 | 301 | extern void blk_throtl_stat_add(struct request *rq, u64 time); |
9e234eea SL |
302 | #else |
303 | static inline void blk_throtl_bio_endio(struct bio *bio) { } | |
b9147dd1 | 304 | static inline void blk_throtl_stat_add(struct request *rq, u64 time) { } |
297e3d85 | 305 | #endif |
bc9fcbf9 | 306 | |
3bce016a CH |
307 | #ifdef CONFIG_BOUNCE |
308 | extern int init_emergency_isa_pool(void); | |
309 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); | |
310 | #else | |
311 | static inline int init_emergency_isa_pool(void) | |
312 | { | |
313 | return 0; | |
314 | } | |
315 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) | |
316 | { | |
317 | } | |
318 | #endif /* CONFIG_BOUNCE */ | |
319 | ||
d7067512 JB |
320 | #ifdef CONFIG_BLK_CGROUP_IOLATENCY |
321 | extern int blk_iolatency_init(struct request_queue *q); | |
322 | #else | |
323 | static inline int blk_iolatency_init(struct request_queue *q) { return 0; } | |
324 | #endif | |
325 | ||
a2d6b3a2 DLM |
326 | struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp); |
327 | ||
bf505456 DLM |
328 | #ifdef CONFIG_BLK_DEV_ZONED |
329 | void blk_queue_free_zone_bitmaps(struct request_queue *q); | |
330 | #else | |
331 | static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {} | |
332 | #endif | |
333 | ||
bc9fcbf9 | 334 | #endif /* BLK_INTERNAL_H */ |