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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
320ae51f JA |
2 | #ifndef INT_BLK_MQ_H |
3 | #define INT_BLK_MQ_H | |
4 | ||
cf43e6be | 5 | #include "blk-stat.h" |
244c65a3 | 6 | #include "blk-mq-tag.h" |
cf43e6be | 7 | |
24d2f903 CH |
8 | struct blk_mq_tag_set; |
9 | ||
1db4909e ML |
10 | struct blk_mq_ctxs { |
11 | struct kobject kobj; | |
12 | struct blk_mq_ctx __percpu *queue_ctx; | |
13 | }; | |
14 | ||
fe644072 LW |
15 | /** |
16 | * struct blk_mq_ctx - State for a software queue facing the submitting CPUs | |
17 | */ | |
320ae51f JA |
18 | struct blk_mq_ctx { |
19 | struct { | |
20 | spinlock_t lock; | |
21 | struct list_head rq_list; | |
22 | } ____cacheline_aligned_in_smp; | |
23 | ||
24 | unsigned int cpu; | |
f31967f0 | 25 | unsigned short index_hw[HCTX_MAX_TYPES]; |
320ae51f JA |
26 | |
27 | /* incremented at dispatch time */ | |
28 | unsigned long rq_dispatched[2]; | |
29 | unsigned long rq_merged; | |
30 | ||
31 | /* incremented at completion time */ | |
32 | unsigned long ____cacheline_aligned_in_smp rq_completed[2]; | |
33 | ||
34 | struct request_queue *queue; | |
1db4909e | 35 | struct blk_mq_ctxs *ctxs; |
320ae51f | 36 | struct kobject kobj; |
4bb659b1 | 37 | } ____cacheline_aligned_in_smp; |
320ae51f | 38 | |
780db207 | 39 | void blk_mq_freeze_queue(struct request_queue *q); |
3edcc0ce | 40 | void blk_mq_free_queue(struct request_queue *q); |
e3a2b3f9 | 41 | int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr); |
aed3ea94 | 42 | void blk_mq_wake_waiters(struct request_queue *q); |
de148297 | 43 | bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool); |
2c3ad667 | 44 | void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list); |
8ab6bb9e | 45 | bool blk_mq_get_driver_tag(struct request *rq); |
b347689f ML |
46 | struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx, |
47 | struct blk_mq_ctx *start); | |
2c3ad667 JA |
48 | |
49 | /* | |
50 | * Internal helpers for allocating/freeing the request map | |
51 | */ | |
cc71a6f4 JA |
52 | void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, |
53 | unsigned int hctx_idx); | |
54 | void blk_mq_free_rq_map(struct blk_mq_tags *tags); | |
55 | struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set, | |
56 | unsigned int hctx_idx, | |
57 | unsigned int nr_tags, | |
58 | unsigned int reserved_tags); | |
59 | int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, | |
60 | unsigned int hctx_idx, unsigned int depth); | |
2c3ad667 JA |
61 | |
62 | /* | |
63 | * Internal helpers for request insertion into sw queues | |
64 | */ | |
65 | void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, | |
66 | bool at_head); | |
b0850297 | 67 | void blk_mq_request_bypass_insert(struct request *rq, bool run_queue); |
bd166ef1 JA |
68 | void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, |
69 | struct list_head *list); | |
320ae51f | 70 | |
396eaf21 | 71 | /* Used by blk_insert_cloned_request() to issue request directly */ |
be94f058 | 72 | blk_status_t blk_mq_request_issue_directly(struct request *rq, bool last); |
6ce3dd6e ML |
73 | void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx, |
74 | struct list_head *list); | |
396eaf21 | 75 | |
320ae51f JA |
76 | /* |
77 | * CPU -> queue mappings | |
78 | */ | |
ed76e329 | 79 | extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int); |
320ae51f | 80 | |
b3c661b1 JA |
81 | /* |
82 | * blk_mq_map_queue_type() - map (hctx_type,cpu) to hardware queue | |
83 | * @q: request queue | |
e20ba6e1 | 84 | * @type: the hctx type index |
b3c661b1 JA |
85 | * @cpu: CPU |
86 | */ | |
87 | static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *q, | |
e20ba6e1 | 88 | enum hctx_type type, |
b3c661b1 | 89 | unsigned int cpu) |
7d7e0f90 | 90 | { |
e20ba6e1 | 91 | return q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]]; |
7d7e0f90 CH |
92 | } |
93 | ||
b3c661b1 JA |
94 | /* |
95 | * blk_mq_map_queue() - map (cmd_flags,type) to hardware queue | |
96 | * @q: request queue | |
97 | * @flags: request command flags | |
98 | * @cpu: CPU | |
99 | */ | |
100 | static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, | |
101 | unsigned int flags, | |
102 | unsigned int cpu) | |
ff2c5660 | 103 | { |
e20ba6e1 CH |
104 | enum hctx_type type = HCTX_TYPE_DEFAULT; |
105 | ||
106 | if (q->tag_set->nr_maps > HCTX_TYPE_POLL && | |
107 | ((flags & REQ_HIPRI) && test_bit(QUEUE_FLAG_POLL, &q->queue_flags))) | |
108 | type = HCTX_TYPE_POLL; | |
b3c661b1 | 109 | |
e20ba6e1 CH |
110 | else if (q->tag_set->nr_maps > HCTX_TYPE_READ && |
111 | ((flags & REQ_OP_MASK) == REQ_OP_READ)) | |
112 | type = HCTX_TYPE_READ; | |
b3c661b1 | 113 | |
e20ba6e1 | 114 | return blk_mq_map_queue_type(q, type, cpu); |
ff2c5660 JA |
115 | } |
116 | ||
67aec14c JA |
117 | /* |
118 | * sysfs helpers | |
119 | */ | |
737f98cf | 120 | extern void blk_mq_sysfs_init(struct request_queue *q); |
7ea5fe31 | 121 | extern void blk_mq_sysfs_deinit(struct request_queue *q); |
2d0364c8 | 122 | extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q); |
67aec14c JA |
123 | extern int blk_mq_sysfs_register(struct request_queue *q); |
124 | extern void blk_mq_sysfs_unregister(struct request_queue *q); | |
868f2f0b | 125 | extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx); |
67aec14c | 126 | |
e09aae7e ML |
127 | void blk_mq_release(struct request_queue *q); |
128 | ||
1d9bd516 TH |
129 | /** |
130 | * blk_mq_rq_state() - read the current MQ_RQ_* state of a request | |
131 | * @rq: target request. | |
132 | */ | |
12f5b931 | 133 | static inline enum mq_rq_state blk_mq_rq_state(struct request *rq) |
1d9bd516 | 134 | { |
12f5b931 | 135 | return READ_ONCE(rq->state); |
1d9bd516 TH |
136 | } |
137 | ||
1aecfe48 ML |
138 | static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, |
139 | unsigned int cpu) | |
140 | { | |
141 | return per_cpu_ptr(q->queue_ctx, cpu); | |
142 | } | |
143 | ||
144 | /* | |
145 | * This assumes per-cpu software queueing queues. They could be per-node | |
146 | * as well, for instance. For now this is hardcoded as-is. Note that we don't | |
147 | * care about preemption, since we know the ctx's are persistent. This does | |
148 | * mean that we can't rely on ctx always matching the currently running CPU. | |
149 | */ | |
150 | static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) | |
151 | { | |
152 | return __blk_mq_get_ctx(q, get_cpu()); | |
153 | } | |
154 | ||
155 | static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) | |
156 | { | |
157 | put_cpu(); | |
158 | } | |
159 | ||
cb96a42c ML |
160 | struct blk_mq_alloc_data { |
161 | /* input parameter */ | |
162 | struct request_queue *q; | |
9a95e4ef | 163 | blk_mq_req_flags_t flags; |
229a9287 | 164 | unsigned int shallow_depth; |
f9afca4d | 165 | unsigned int cmd_flags; |
cb96a42c ML |
166 | |
167 | /* input & output parameter */ | |
168 | struct blk_mq_ctx *ctx; | |
169 | struct blk_mq_hw_ctx *hctx; | |
170 | }; | |
171 | ||
4941115b JA |
172 | static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data) |
173 | { | |
bd166ef1 JA |
174 | if (data->flags & BLK_MQ_REQ_INTERNAL) |
175 | return data->hctx->sched_tags; | |
176 | ||
4941115b JA |
177 | return data->hctx->tags; |
178 | } | |
179 | ||
5d1b25c1 BVA |
180 | static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx) |
181 | { | |
182 | return test_bit(BLK_MQ_S_STOPPED, &hctx->state); | |
183 | } | |
184 | ||
19c66e59 ML |
185 | static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) |
186 | { | |
187 | return hctx->nr_ctx && hctx->tags; | |
188 | } | |
189 | ||
e016b782 | 190 | unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part); |
bf0ddaba OS |
191 | void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part, |
192 | unsigned int inflight[2]); | |
f299b7c7 | 193 | |
de148297 ML |
194 | static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx) |
195 | { | |
196 | struct request_queue *q = hctx->queue; | |
197 | ||
198 | if (q->mq_ops->put_budget) | |
199 | q->mq_ops->put_budget(hctx); | |
200 | } | |
201 | ||
88022d72 | 202 | static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx) |
de148297 ML |
203 | { |
204 | struct request_queue *q = hctx->queue; | |
205 | ||
206 | if (q->mq_ops->get_budget) | |
207 | return q->mq_ops->get_budget(hctx); | |
88022d72 | 208 | return true; |
de148297 ML |
209 | } |
210 | ||
244c65a3 ML |
211 | static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx, |
212 | struct request *rq) | |
213 | { | |
214 | blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag); | |
215 | rq->tag = -1; | |
216 | ||
217 | if (rq->rq_flags & RQF_MQ_INFLIGHT) { | |
218 | rq->rq_flags &= ~RQF_MQ_INFLIGHT; | |
219 | atomic_dec(&hctx->nr_active); | |
220 | } | |
221 | } | |
222 | ||
223 | static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx, | |
224 | struct request *rq) | |
225 | { | |
226 | if (rq->tag == -1 || rq->internal_tag == -1) | |
227 | return; | |
228 | ||
229 | __blk_mq_put_driver_tag(hctx, rq); | |
230 | } | |
231 | ||
232 | static inline void blk_mq_put_driver_tag(struct request *rq) | |
233 | { | |
244c65a3 ML |
234 | if (rq->tag == -1 || rq->internal_tag == -1) |
235 | return; | |
236 | ||
ea4f995e | 237 | __blk_mq_put_driver_tag(rq->mq_hctx, rq); |
244c65a3 ML |
238 | } |
239 | ||
ed76e329 | 240 | static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap) |
0da73d00 MI |
241 | { |
242 | int cpu; | |
243 | ||
244 | for_each_possible_cpu(cpu) | |
ed76e329 | 245 | qmap->mq_map[cpu] = 0; |
0da73d00 MI |
246 | } |
247 | ||
320ae51f | 248 | #endif |