1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include "blk-mq-tag.h"
12 struct blk_mq_ctx __percpu *queue_ctx;
16 * struct blk_mq_ctx - State for a software queue facing the submitting CPUs
21 struct list_head rq_list;
22 } ____cacheline_aligned_in_smp;
25 unsigned short index_hw[HCTX_MAX_TYPES];
27 /* incremented at dispatch time */
28 unsigned long rq_dispatched[2];
29 unsigned long rq_merged;
31 /* incremented at completion time */
32 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
34 struct request_queue *queue;
35 struct blk_mq_ctxs *ctxs;
37 } ____cacheline_aligned_in_smp;
39 void blk_mq_freeze_queue(struct request_queue *q);
40 void blk_mq_free_queue(struct request_queue *q);
41 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
42 void blk_mq_wake_waiters(struct request_queue *q);
43 bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool);
44 void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
45 bool blk_mq_get_driver_tag(struct request *rq);
46 struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
47 struct blk_mq_ctx *start);
50 * Internal helpers for allocating/freeing the request map
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,
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);
63 * Internal helpers for request insertion into sw queues
65 void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
67 void blk_mq_request_bypass_insert(struct request *rq, bool run_queue);
68 void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
69 struct list_head *list);
71 /* Used by blk_insert_cloned_request() to issue request directly */
72 blk_status_t blk_mq_request_issue_directly(struct request *rq, bool last);
73 void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
74 struct list_head *list);
77 * CPU -> queue mappings
79 extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int);
82 * blk_mq_map_queue_type() - map (hctx_type,cpu) to hardware queue
84 * @hctx_type: the hctx type index
87 static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *q,
88 unsigned int hctx_type,
91 struct blk_mq_tag_set *set = q->tag_set;
93 return q->queue_hw_ctx[set->map[hctx_type].mq_map[cpu]];
97 * blk_mq_map_queue() - map (cmd_flags,type) to hardware queue
99 * @flags: request command flags
102 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
108 if (q->mq_ops->rq_flags_to_type)
109 hctx_type = q->mq_ops->rq_flags_to_type(q, flags);
111 return blk_mq_map_queue_type(q, hctx_type, cpu);
117 extern void blk_mq_sysfs_init(struct request_queue *q);
118 extern void blk_mq_sysfs_deinit(struct request_queue *q);
119 extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
120 extern int blk_mq_sysfs_register(struct request_queue *q);
121 extern void blk_mq_sysfs_unregister(struct request_queue *q);
122 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
124 void blk_mq_release(struct request_queue *q);
127 * blk_mq_rq_state() - read the current MQ_RQ_* state of a request
128 * @rq: target request.
130 static inline enum mq_rq_state blk_mq_rq_state(struct request *rq)
132 return READ_ONCE(rq->state);
135 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
138 return per_cpu_ptr(q->queue_ctx, cpu);
142 * This assumes per-cpu software queueing queues. They could be per-node
143 * as well, for instance. For now this is hardcoded as-is. Note that we don't
144 * care about preemption, since we know the ctx's are persistent. This does
145 * mean that we can't rely on ctx always matching the currently running CPU.
147 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
149 return __blk_mq_get_ctx(q, get_cpu());
152 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
157 struct blk_mq_alloc_data {
158 /* input parameter */
159 struct request_queue *q;
160 blk_mq_req_flags_t flags;
161 unsigned int shallow_depth;
162 unsigned int cmd_flags;
164 /* input & output parameter */
165 struct blk_mq_ctx *ctx;
166 struct blk_mq_hw_ctx *hctx;
169 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
171 if (data->flags & BLK_MQ_REQ_INTERNAL)
172 return data->hctx->sched_tags;
174 return data->hctx->tags;
177 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
179 return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
182 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
184 return hctx->nr_ctx && hctx->tags;
187 void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
188 unsigned int inflight[2]);
189 void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part,
190 unsigned int inflight[2]);
192 static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx)
194 struct request_queue *q = hctx->queue;
196 if (q->mq_ops->put_budget)
197 q->mq_ops->put_budget(hctx);
200 static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx)
202 struct request_queue *q = hctx->queue;
204 if (q->mq_ops->get_budget)
205 return q->mq_ops->get_budget(hctx);
209 static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
212 blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag);
215 if (rq->rq_flags & RQF_MQ_INFLIGHT) {
216 rq->rq_flags &= ~RQF_MQ_INFLIGHT;
217 atomic_dec(&hctx->nr_active);
221 static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx,
224 if (rq->tag == -1 || rq->internal_tag == -1)
227 __blk_mq_put_driver_tag(hctx, rq);
230 static inline void blk_mq_put_driver_tag(struct request *rq)
232 if (rq->tag == -1 || rq->internal_tag == -1)
235 __blk_mq_put_driver_tag(rq->mq_hctx, rq);
238 static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
242 for_each_possible_cpu(cpu)
243 qmap->mq_map[cpu] = 0;