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TOMOYO Linux Cross Reference
Linux/block/blk-mq.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef INT_BLK_MQ_H
  3 #define INT_BLK_MQ_H
  4 
  5 #include "blk-stat.h"
  6 #include "blk-mq-tag.h"
  7 
  8 struct blk_mq_tag_set;
  9 
 10 /**
 11  * struct blk_mq_ctx - State for a software queue facing the submitting CPUs
 12  */
 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;
 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;
 31 } ____cacheline_aligned_in_smp;
 32 
 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, struct blk_mq_hw_ctx **hctx,
 40                                 bool wait);
 41 struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
 42                                         struct blk_mq_ctx *start);
 43 
 44 /*
 45  * Internal helpers for allocating/freeing the request map
 46  */
 47 void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
 48                      unsigned int hctx_idx);
 49 void blk_mq_free_rq_map(struct blk_mq_tags *tags);
 50 struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,
 51                                         unsigned int hctx_idx,
 52                                         unsigned int nr_tags,
 53                                         unsigned int reserved_tags);
 54 int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
 55                      unsigned int hctx_idx, unsigned int depth);
 56 
 57 /*
 58  * Internal helpers for request insertion into sw queues
 59  */
 60 void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
 61                                 bool at_head);
 62 void blk_mq_request_bypass_insert(struct request *rq, bool run_queue);
 63 void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
 64                                 struct list_head *list);
 65 
 66 /* Used by blk_insert_cloned_request() to issue request directly */
 67 blk_status_t blk_mq_request_issue_directly(struct request *rq);
 68 
 69 /*
 70  * CPU -> queue mappings
 71  */
 72 extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
 73 
 74 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
 75                 int cpu)
 76 {
 77         return q->queue_hw_ctx[q->mq_map[cpu]];
 78 }
 79 
 80 /*
 81  * sysfs helpers
 82  */
 83 extern void blk_mq_sysfs_init(struct request_queue *q);
 84 extern void blk_mq_sysfs_deinit(struct request_queue *q);
 85 extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
 86 extern int blk_mq_sysfs_register(struct request_queue *q);
 87 extern void blk_mq_sysfs_unregister(struct request_queue *q);
 88 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
 89 
 90 void blk_mq_release(struct request_queue *q);
 91 
 92 /**
 93  * blk_mq_rq_state() - read the current MQ_RQ_* state of a request
 94  * @rq: target request.
 95  */
 96 static inline enum mq_rq_state blk_mq_rq_state(struct request *rq)
 97 {
 98         return READ_ONCE(rq->state);
 99 }
100 
101 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
102                                            unsigned int cpu)
103 {
104         return per_cpu_ptr(q->queue_ctx, cpu);
105 }
106 
107 /*
108  * This assumes per-cpu software queueing queues. They could be per-node
109  * as well, for instance. For now this is hardcoded as-is. Note that we don't
110  * care about preemption, since we know the ctx's are persistent. This does
111  * mean that we can't rely on ctx always matching the currently running CPU.
112  */
113 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
114 {
115         return __blk_mq_get_ctx(q, get_cpu());
116 }
117 
118 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
119 {
120         put_cpu();
121 }
122 
123 struct blk_mq_alloc_data {
124         /* input parameter */
125         struct request_queue *q;
126         blk_mq_req_flags_t flags;
127         unsigned int shallow_depth;
128 
129         /* input & output parameter */
130         struct blk_mq_ctx *ctx;
131         struct blk_mq_hw_ctx *hctx;
132 };
133 
134 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
135 {
136         if (data->flags & BLK_MQ_REQ_INTERNAL)
137                 return data->hctx->sched_tags;
138 
139         return data->hctx->tags;
140 }
141 
142 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
143 {
144         return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
145 }
146 
147 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
148 {
149         return hctx->nr_ctx && hctx->tags;
150 }
151 
152 void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
153                       unsigned int inflight[2]);
154 void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part,
155                          unsigned int inflight[2]);
156 
157 static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx)
158 {
159         struct request_queue *q = hctx->queue;
160 
161         if (q->mq_ops->put_budget)
162                 q->mq_ops->put_budget(hctx);
163 }
164 
165 static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx)
166 {
167         struct request_queue *q = hctx->queue;
168 
169         if (q->mq_ops->get_budget)
170                 return q->mq_ops->get_budget(hctx);
171         return true;
172 }
173 
174 static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
175                                            struct request *rq)
176 {
177         blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag);
178         rq->tag = -1;
179 
180         if (rq->rq_flags & RQF_MQ_INFLIGHT) {
181                 rq->rq_flags &= ~RQF_MQ_INFLIGHT;
182                 atomic_dec(&hctx->nr_active);
183         }
184 }
185 
186 static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx,
187                                        struct request *rq)
188 {
189         if (rq->tag == -1 || rq->internal_tag == -1)
190                 return;
191 
192         __blk_mq_put_driver_tag(hctx, rq);
193 }
194 
195 static inline void blk_mq_put_driver_tag(struct request *rq)
196 {
197         struct blk_mq_hw_ctx *hctx;
198 
199         if (rq->tag == -1 || rq->internal_tag == -1)
200                 return;
201 
202         hctx = blk_mq_map_queue(rq->q, rq->mq_ctx->cpu);
203         __blk_mq_put_driver_tag(hctx, rq);
204 }
205 
206 #endif
207 

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