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 7 struct blk_mq_tag_set; 8 9 struct blk_mq_ctx { 10 struct { 11 spinlock_t lock; 12 struct list_head rq_list; 13 } ____cacheline_aligned_in_smp; 14 15 unsigned int cpu; 16 unsigned int index_hw; 17 18 /* incremented at dispatch time */ 19 unsigned long rq_dispatched[2]; 20 unsigned long rq_merged; 21 22 /* incremented at completion time */ 23 unsigned long ____cacheline_aligned_in_smp rq_completed[2]; 24 25 struct request_queue *queue; 26 struct kobject kobj; 27 } ____cacheline_aligned_in_smp; 28 29 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); 30 void blk_mq_freeze_queue(struct request_queue *q); 31 void blk_mq_free_queue(struct request_queue *q); 32 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr); 33 void blk_mq_wake_waiters(struct request_queue *q); 34 bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *); 35 void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list); 36 bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx); 37 bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx, 38 bool wait); 39 40 /* 41 * Internal helpers for allocating/freeing the request map 42 */ 43 void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, 44 unsigned int hctx_idx); 45 void blk_mq_free_rq_map(struct blk_mq_tags *tags); 46 struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set, 47 unsigned int hctx_idx, 48 unsigned int nr_tags, 49 unsigned int reserved_tags); 50 int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, 51 unsigned int hctx_idx, unsigned int depth); 52 53 /* 54 * Internal helpers for request insertion into sw queues 55 */ 56 void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, 57 bool at_head); 58 void blk_mq_request_bypass_insert(struct request *rq); 59 void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, 60 struct list_head *list); 61 62 /* 63 * CPU -> queue mappings 64 */ 65 extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int); 66 67 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, 68 int cpu) 69 { 70 return q->queue_hw_ctx[q->mq_map[cpu]]; 71 } 72 73 /* 74 * sysfs helpers 75 */ 76 extern void blk_mq_sysfs_init(struct request_queue *q); 77 extern void blk_mq_sysfs_deinit(struct request_queue *q); 78 extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q); 79 extern int blk_mq_sysfs_register(struct request_queue *q); 80 extern void blk_mq_sysfs_unregister(struct request_queue *q); 81 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx); 82 83 extern void blk_mq_rq_timed_out(struct request *req, bool reserved); 84 85 void blk_mq_release(struct request_queue *q); 86 87 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, 88 unsigned int cpu) 89 { 90 return per_cpu_ptr(q->queue_ctx, cpu); 91 } 92 93 /* 94 * This assumes per-cpu software queueing queues. They could be per-node 95 * as well, for instance. For now this is hardcoded as-is. Note that we don't 96 * care about preemption, since we know the ctx's are persistent. This does 97 * mean that we can't rely on ctx always matching the currently running CPU. 98 */ 99 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) 100 { 101 return __blk_mq_get_ctx(q, get_cpu()); 102 } 103 104 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) 105 { 106 put_cpu(); 107 } 108 109 struct blk_mq_alloc_data { 110 /* input parameter */ 111 struct request_queue *q; 112 unsigned int flags; 113 unsigned int shallow_depth; 114 115 /* input & output parameter */ 116 struct blk_mq_ctx *ctx; 117 struct blk_mq_hw_ctx *hctx; 118 }; 119 120 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data) 121 { 122 if (data->flags & BLK_MQ_REQ_INTERNAL) 123 return data->hctx->sched_tags; 124 125 return data->hctx->tags; 126 } 127 128 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx) 129 { 130 return test_bit(BLK_MQ_S_STOPPED, &hctx->state); 131 } 132 133 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) 134 { 135 return hctx->nr_ctx && hctx->tags; 136 } 137 138 void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part, 139 unsigned int inflight[2]); 140 141 #endif 142