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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 | ||
fe644072 LW |
10 | /** |
11 | * struct blk_mq_ctx - State for a software queue facing the submitting CPUs | |
12 | */ | |
320ae51f JA |
13 | struct blk_mq_ctx { |
14 | struct { | |
15 | spinlock_t lock; | |
16 | struct list_head rq_list; | |
17 | } ____cacheline_aligned_in_smp; | |
18 | ||
19 | unsigned int cpu; | |
20 | unsigned int index_hw; | |
320ae51f JA |
21 | |
22 | /* incremented at dispatch time */ | |
23 | unsigned long rq_dispatched[2]; | |
24 | unsigned long rq_merged; | |
25 | ||
26 | /* incremented at completion time */ | |
27 | unsigned long ____cacheline_aligned_in_smp rq_completed[2]; | |
28 | ||
29 | struct request_queue *queue; | |
30 | struct kobject kobj; | |
4bb659b1 | 31 | } ____cacheline_aligned_in_smp; |
320ae51f | 32 | |
780db207 | 33 | void blk_mq_freeze_queue(struct request_queue *q); |
3edcc0ce | 34 | void blk_mq_free_queue(struct request_queue *q); |
e3a2b3f9 | 35 | int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr); |
aed3ea94 | 36 | void blk_mq_wake_waiters(struct request_queue *q); |
de148297 | 37 | bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool); |
2c3ad667 | 38 | void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list); |
8ab6bb9e | 39 | bool blk_mq_get_driver_tag(struct request *rq); |
b347689f ML |
40 | struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx, |
41 | struct blk_mq_ctx *start); | |
2c3ad667 JA |
42 | |
43 | /* | |
44 | * Internal helpers for allocating/freeing the request map | |
45 | */ | |
cc71a6f4 JA |
46 | void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, |
47 | unsigned int hctx_idx); | |
48 | void blk_mq_free_rq_map(struct blk_mq_tags *tags); | |
49 | struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set, | |
50 | unsigned int hctx_idx, | |
51 | unsigned int nr_tags, | |
52 | unsigned int reserved_tags); | |
53 | int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, | |
54 | unsigned int hctx_idx, unsigned int depth); | |
2c3ad667 JA |
55 | |
56 | /* | |
57 | * Internal helpers for request insertion into sw queues | |
58 | */ | |
59 | void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, | |
60 | bool at_head); | |
b0850297 | 61 | void blk_mq_request_bypass_insert(struct request *rq, bool run_queue); |
bd166ef1 JA |
62 | void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, |
63 | struct list_head *list); | |
320ae51f | 64 | |
396eaf21 | 65 | /* Used by blk_insert_cloned_request() to issue request directly */ |
c77ff7fd | 66 | blk_status_t blk_mq_request_issue_directly(struct request *rq); |
6ce3dd6e ML |
67 | void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx, |
68 | struct list_head *list); | |
396eaf21 | 69 | |
320ae51f JA |
70 | /* |
71 | * CPU -> queue mappings | |
72 | */ | |
ed76e329 | 73 | extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int); |
320ae51f | 74 | |
7d7e0f90 | 75 | static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, |
f9afca4d | 76 | unsigned int flags, |
ff2c5660 | 77 | unsigned int cpu) |
7d7e0f90 | 78 | { |
a8908939 JA |
79 | struct blk_mq_tag_set *set = q->tag_set; |
80 | ||
ed76e329 | 81 | return q->queue_hw_ctx[set->map[0].mq_map[cpu]]; |
7d7e0f90 CH |
82 | } |
83 | ||
ff2c5660 JA |
84 | static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *q, |
85 | unsigned int hctx_type, | |
86 | unsigned int cpu) | |
87 | { | |
f9afca4d | 88 | return blk_mq_map_queue(q, hctx_type, cpu); |
ff2c5660 JA |
89 | } |
90 | ||
67aec14c JA |
91 | /* |
92 | * sysfs helpers | |
93 | */ | |
737f98cf | 94 | extern void blk_mq_sysfs_init(struct request_queue *q); |
7ea5fe31 | 95 | extern void blk_mq_sysfs_deinit(struct request_queue *q); |
2d0364c8 | 96 | extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q); |
67aec14c JA |
97 | extern int blk_mq_sysfs_register(struct request_queue *q); |
98 | extern void blk_mq_sysfs_unregister(struct request_queue *q); | |
868f2f0b | 99 | extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx); |
67aec14c | 100 | |
e09aae7e ML |
101 | void blk_mq_release(struct request_queue *q); |
102 | ||
1d9bd516 TH |
103 | /** |
104 | * blk_mq_rq_state() - read the current MQ_RQ_* state of a request | |
105 | * @rq: target request. | |
106 | */ | |
12f5b931 | 107 | static inline enum mq_rq_state blk_mq_rq_state(struct request *rq) |
1d9bd516 | 108 | { |
12f5b931 | 109 | return READ_ONCE(rq->state); |
1d9bd516 TH |
110 | } |
111 | ||
1aecfe48 ML |
112 | static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, |
113 | unsigned int cpu) | |
114 | { | |
115 | return per_cpu_ptr(q->queue_ctx, cpu); | |
116 | } | |
117 | ||
118 | /* | |
119 | * This assumes per-cpu software queueing queues. They could be per-node | |
120 | * as well, for instance. For now this is hardcoded as-is. Note that we don't | |
121 | * care about preemption, since we know the ctx's are persistent. This does | |
122 | * mean that we can't rely on ctx always matching the currently running CPU. | |
123 | */ | |
124 | static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) | |
125 | { | |
126 | return __blk_mq_get_ctx(q, get_cpu()); | |
127 | } | |
128 | ||
129 | static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) | |
130 | { | |
131 | put_cpu(); | |
132 | } | |
133 | ||
cb96a42c ML |
134 | struct blk_mq_alloc_data { |
135 | /* input parameter */ | |
136 | struct request_queue *q; | |
9a95e4ef | 137 | blk_mq_req_flags_t flags; |
229a9287 | 138 | unsigned int shallow_depth; |
f9afca4d | 139 | unsigned int cmd_flags; |
cb96a42c ML |
140 | |
141 | /* input & output parameter */ | |
142 | struct blk_mq_ctx *ctx; | |
143 | struct blk_mq_hw_ctx *hctx; | |
144 | }; | |
145 | ||
4941115b JA |
146 | static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data) |
147 | { | |
bd166ef1 JA |
148 | if (data->flags & BLK_MQ_REQ_INTERNAL) |
149 | return data->hctx->sched_tags; | |
150 | ||
4941115b JA |
151 | return data->hctx->tags; |
152 | } | |
153 | ||
5d1b25c1 BVA |
154 | static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx) |
155 | { | |
156 | return test_bit(BLK_MQ_S_STOPPED, &hctx->state); | |
157 | } | |
158 | ||
19c66e59 ML |
159 | static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) |
160 | { | |
161 | return hctx->nr_ctx && hctx->tags; | |
162 | } | |
163 | ||
f299b7c7 | 164 | void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part, |
bf0ddaba OS |
165 | unsigned int inflight[2]); |
166 | void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part, | |
167 | unsigned int inflight[2]); | |
f299b7c7 | 168 | |
de148297 ML |
169 | static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx) |
170 | { | |
171 | struct request_queue *q = hctx->queue; | |
172 | ||
173 | if (q->mq_ops->put_budget) | |
174 | q->mq_ops->put_budget(hctx); | |
175 | } | |
176 | ||
88022d72 | 177 | static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx) |
de148297 ML |
178 | { |
179 | struct request_queue *q = hctx->queue; | |
180 | ||
181 | if (q->mq_ops->get_budget) | |
182 | return q->mq_ops->get_budget(hctx); | |
88022d72 | 183 | return true; |
de148297 ML |
184 | } |
185 | ||
244c65a3 ML |
186 | static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx, |
187 | struct request *rq) | |
188 | { | |
189 | blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag); | |
190 | rq->tag = -1; | |
191 | ||
192 | if (rq->rq_flags & RQF_MQ_INFLIGHT) { | |
193 | rq->rq_flags &= ~RQF_MQ_INFLIGHT; | |
194 | atomic_dec(&hctx->nr_active); | |
195 | } | |
196 | } | |
197 | ||
198 | static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx, | |
199 | struct request *rq) | |
200 | { | |
201 | if (rq->tag == -1 || rq->internal_tag == -1) | |
202 | return; | |
203 | ||
204 | __blk_mq_put_driver_tag(hctx, rq); | |
205 | } | |
206 | ||
207 | static inline void blk_mq_put_driver_tag(struct request *rq) | |
208 | { | |
209 | struct blk_mq_hw_ctx *hctx; | |
210 | ||
211 | if (rq->tag == -1 || rq->internal_tag == -1) | |
212 | return; | |
213 | ||
f9afca4d | 214 | hctx = blk_mq_map_queue(rq->q, rq->cmd_flags, rq->mq_ctx->cpu); |
244c65a3 ML |
215 | __blk_mq_put_driver_tag(hctx, rq); |
216 | } | |
217 | ||
ed76e329 | 218 | static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap) |
0da73d00 MI |
219 | { |
220 | int cpu; | |
221 | ||
222 | for_each_possible_cpu(cpu) | |
ed76e329 | 223 | qmap->mq_map[cpu] = 0; |
0da73d00 MI |
224 | } |
225 | ||
320ae51f | 226 | #endif |