1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include "blk-mq-tag.h"
11 * struct blk_mq_ctx - State for a software queue facing the submitting CPUs
16 struct list_head rq_list;
17 } ____cacheline_aligned_in_smp;
20 unsigned int index_hw;
22 /* incremented at dispatch time */
23 unsigned long rq_dispatched[2];
24 unsigned long rq_merged;
26 /* incremented at completion time */
27 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
29 struct request_queue *queue;
31 } ____cacheline_aligned_in_smp;
33 void blk_mq_freeze_queue(struct request_queue *q);
34 void blk_mq_free_queue(struct request_queue *q);
35 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
36 void blk_mq_wake_waiters(struct request_queue *q);
37 bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool);
38 void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
39 bool blk_mq_get_driver_tag(struct request *rq);
40 struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
41 struct blk_mq_ctx *start);
44 * Internal helpers for allocating/freeing the request map
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,
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);
57 * Internal helpers for request insertion into sw queues
59 void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
61 void blk_mq_request_bypass_insert(struct request *rq, bool run_queue);
62 void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
63 struct list_head *list);
65 /* Used by blk_insert_cloned_request() to issue request directly */
66 blk_status_t blk_mq_request_issue_directly(struct request *rq);
67 void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
68 struct list_head *list);
71 * CPU -> queue mappings
73 extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int);
75 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
79 struct blk_mq_tag_set *set = q->tag_set;
81 return q->queue_hw_ctx[set->map[0].mq_map[cpu]];
84 static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *q,
85 unsigned int hctx_type,
88 return blk_mq_map_queue(q, hctx_type, cpu);
94 extern void blk_mq_sysfs_init(struct request_queue *q);
95 extern void blk_mq_sysfs_deinit(struct request_queue *q);
96 extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
97 extern int blk_mq_sysfs_register(struct request_queue *q);
98 extern void blk_mq_sysfs_unregister(struct request_queue *q);
99 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
101 void blk_mq_release(struct request_queue *q);
104 * blk_mq_rq_state() - read the current MQ_RQ_* state of a request
105 * @rq: target request.
107 static inline enum mq_rq_state blk_mq_rq_state(struct request *rq)
109 return READ_ONCE(rq->state);
112 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
115 return per_cpu_ptr(q->queue_ctx, cpu);
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.
124 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
126 return __blk_mq_get_ctx(q, get_cpu());
129 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
134 struct blk_mq_alloc_data {
135 /* input parameter */
136 struct request_queue *q;
137 blk_mq_req_flags_t flags;
138 unsigned int shallow_depth;
139 unsigned int cmd_flags;
141 /* input & output parameter */
142 struct blk_mq_ctx *ctx;
143 struct blk_mq_hw_ctx *hctx;
146 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
148 if (data->flags & BLK_MQ_REQ_INTERNAL)
149 return data->hctx->sched_tags;
151 return data->hctx->tags;
154 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
156 return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
159 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
161 return hctx->nr_ctx && hctx->tags;
164 void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
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]);
169 static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx)
171 struct request_queue *q = hctx->queue;
173 if (q->mq_ops->put_budget)
174 q->mq_ops->put_budget(hctx);
177 static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx)
179 struct request_queue *q = hctx->queue;
181 if (q->mq_ops->get_budget)
182 return q->mq_ops->get_budget(hctx);
186 static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
189 blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag);
192 if (rq->rq_flags & RQF_MQ_INFLIGHT) {
193 rq->rq_flags &= ~RQF_MQ_INFLIGHT;
194 atomic_dec(&hctx->nr_active);
198 static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx,
201 if (rq->tag == -1 || rq->internal_tag == -1)
204 __blk_mq_put_driver_tag(hctx, rq);
207 static inline void blk_mq_put_driver_tag(struct request *rq)
209 struct blk_mq_hw_ctx *hctx;
211 if (rq->tag == -1 || rq->internal_tag == -1)
214 hctx = blk_mq_map_queue(rq->q, rq->cmd_flags, rq->mq_ctx->cpu);
215 __blk_mq_put_driver_tag(hctx, rq);
218 static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
222 for_each_possible_cpu(cpu)
223 qmap->mq_map[cpu] = 0;