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_lists[HCTX_MAX_TYPES];
22 } ____cacheline_aligned_in_smp;
25 unsigned short index_hw[HCTX_MAX_TYPES];
26 struct blk_mq_hw_ctx *hctxs[HCTX_MAX_TYPES];
28 /* incremented at dispatch time */
29 unsigned long rq_dispatched[2];
30 unsigned long rq_merged;
32 /* incremented at completion time */
33 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
35 struct request_queue *queue;
36 struct blk_mq_ctxs *ctxs;
38 } ____cacheline_aligned_in_smp;
40 void blk_mq_freeze_queue(struct request_queue *q);
41 void blk_mq_free_queue(struct request_queue *q);
42 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
43 void blk_mq_wake_waiters(struct request_queue *q);
44 bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool);
45 void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
46 bool blk_mq_get_driver_tag(struct request *rq);
47 struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
48 struct blk_mq_ctx *start);
51 * Internal helpers for allocating/freeing the request map
53 void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
54 unsigned int hctx_idx);
55 void blk_mq_free_rq_map(struct blk_mq_tags *tags);
56 struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,
57 unsigned int hctx_idx,
59 unsigned int reserved_tags);
60 int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
61 unsigned int hctx_idx, unsigned int depth);
64 * Internal helpers for request insertion into sw queues
66 void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
68 void blk_mq_request_bypass_insert(struct request *rq, bool run_queue);
69 void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
70 struct list_head *list);
72 blk_status_t blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,
75 bool bypass, bool last);
76 void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
77 struct list_head *list);
80 * CPU -> queue mappings
82 extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int);
85 * blk_mq_map_queue_type() - map (hctx_type,cpu) to hardware queue
87 * @type: the hctx type index
90 static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *q,
94 return q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]];
98 * blk_mq_map_queue() - map (cmd_flags,type) to hardware queue
100 * @flags: request command flags
103 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
105 struct blk_mq_ctx *ctx)
107 enum hctx_type type = HCTX_TYPE_DEFAULT;
109 if ((flags & REQ_HIPRI) &&
110 q->tag_set->nr_maps > HCTX_TYPE_POLL &&
111 q->tag_set->map[HCTX_TYPE_POLL].nr_queues &&
112 test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
113 type = HCTX_TYPE_POLL;
115 else if (((flags & REQ_OP_MASK) == REQ_OP_READ) &&
116 q->tag_set->nr_maps > HCTX_TYPE_READ &&
117 q->tag_set->map[HCTX_TYPE_READ].nr_queues)
118 type = HCTX_TYPE_READ;
120 return ctx->hctxs[type];
126 extern void blk_mq_sysfs_init(struct request_queue *q);
127 extern void blk_mq_sysfs_deinit(struct request_queue *q);
128 extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
129 extern int blk_mq_sysfs_register(struct request_queue *q);
130 extern void blk_mq_sysfs_unregister(struct request_queue *q);
131 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
133 void blk_mq_release(struct request_queue *q);
136 * blk_mq_rq_state() - read the current MQ_RQ_* state of a request
137 * @rq: target request.
139 static inline enum mq_rq_state blk_mq_rq_state(struct request *rq)
141 return READ_ONCE(rq->state);
144 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
147 return per_cpu_ptr(q->queue_ctx, cpu);
151 * This assumes per-cpu software queueing queues. They could be per-node
152 * as well, for instance. For now this is hardcoded as-is. Note that we don't
153 * care about preemption, since we know the ctx's are persistent. This does
154 * mean that we can't rely on ctx always matching the currently running CPU.
156 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
158 return __blk_mq_get_ctx(q, get_cpu());
161 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
166 struct blk_mq_alloc_data {
167 /* input parameter */
168 struct request_queue *q;
169 blk_mq_req_flags_t flags;
170 unsigned int shallow_depth;
171 unsigned int cmd_flags;
173 /* input & output parameter */
174 struct blk_mq_ctx *ctx;
175 struct blk_mq_hw_ctx *hctx;
178 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
180 if (data->flags & BLK_MQ_REQ_INTERNAL)
181 return data->hctx->sched_tags;
183 return data->hctx->tags;
186 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
188 return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
191 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
193 return hctx->nr_ctx && hctx->tags;
196 unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part);
197 void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part,
198 unsigned int inflight[2]);
200 static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx)
202 struct request_queue *q = hctx->queue;
204 if (q->mq_ops->put_budget)
205 q->mq_ops->put_budget(hctx);
208 static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx)
210 struct request_queue *q = hctx->queue;
212 if (q->mq_ops->get_budget)
213 return q->mq_ops->get_budget(hctx);
217 static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
220 blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag);
223 if (rq->rq_flags & RQF_MQ_INFLIGHT) {
224 rq->rq_flags &= ~RQF_MQ_INFLIGHT;
225 atomic_dec(&hctx->nr_active);
229 static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx,
232 if (rq->tag == -1 || rq->internal_tag == -1)
235 __blk_mq_put_driver_tag(hctx, rq);
238 static inline void blk_mq_put_driver_tag(struct request *rq)
240 if (rq->tag == -1 || rq->internal_tag == -1)
243 __blk_mq_put_driver_tag(rq->mq_hctx, rq);
246 static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
250 for_each_possible_cpu(cpu)
251 qmap->mq_map[cpu] = 0;