1 #ifndef INT_BLK_MQ_H 2 #define INT_BLK_MQ_H 3 4 #include "blk-stat.h" 5 6 struct blk_mq_tag_set; 7 8 struct blk_mq_ctx { 9 struct { 10 spinlock_t lock; 11 struct list_head rq_list; 12 } ____cacheline_aligned_in_smp; 13 14 unsigned int cpu; 15 unsigned int index_hw; 16 17 /* incremented at dispatch time */ 18 unsigned long rq_dispatched[2]; 19 unsigned long rq_merged; 20 21 /* incremented at completion time */ 22 unsigned long ____cacheline_aligned_in_smp rq_completed[2]; 23 24 struct request_queue *queue; 25 struct kobject kobj; 26 } ____cacheline_aligned_in_smp; 27 28 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); 29 void blk_mq_freeze_queue(struct request_queue *q); 30 void blk_mq_free_queue(struct request_queue *q); 31 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr); 32 void blk_mq_wake_waiters(struct request_queue *q); 33 bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *); 34 void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list); 35 bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx); 36 bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx, 37 bool wait); 38 39 /* 40 * Internal helpers for allocating/freeing the request map 41 */ 42 void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, 43 unsigned int hctx_idx); 44 void blk_mq_free_rq_map(struct blk_mq_tags *tags); 45 struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set, 46 unsigned int hctx_idx, 47 unsigned int nr_tags, 48 unsigned int reserved_tags); 49 int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, 50 unsigned int hctx_idx, unsigned int depth); 51 52 /* 53 * Internal helpers for request insertion into sw queues 54 */ 55 void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, 56 bool at_head); 57 void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, 58 struct list_head *list); 59 60 /* 61 * CPU -> queue mappings 62 */ 63 extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int); 64 65 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, 66 int cpu) 67 { 68 return q->queue_hw_ctx[q->mq_map[cpu]]; 69 } 70 71 /* 72 * sysfs helpers 73 */ 74 extern void blk_mq_sysfs_init(struct request_queue *q); 75 extern void blk_mq_sysfs_deinit(struct request_queue *q); 76 extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q); 77 extern int blk_mq_sysfs_register(struct request_queue *q); 78 extern void blk_mq_sysfs_unregister(struct request_queue *q); 79 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx); 80 81 extern void blk_mq_rq_timed_out(struct request *req, bool reserved); 82 83 void blk_mq_release(struct request_queue *q); 84 85 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, 86 unsigned int cpu) 87 { 88 return per_cpu_ptr(q->queue_ctx, cpu); 89 } 90 91 /* 92 * This assumes per-cpu software queueing queues. They could be per-node 93 * as well, for instance. For now this is hardcoded as-is. Note that we don't 94 * care about preemption, since we know the ctx's are persistent. This does 95 * mean that we can't rely on ctx always matching the currently running CPU. 96 */ 97 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) 98 { 99 return __blk_mq_get_ctx(q, get_cpu()); 100 } 101 102 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) 103 { 104 put_cpu(); 105 } 106 107 struct blk_mq_alloc_data { 108 /* input parameter */ 109 struct request_queue *q; 110 unsigned int flags; 111 unsigned int shallow_depth; 112 113 /* input & output parameter */ 114 struct blk_mq_ctx *ctx; 115 struct blk_mq_hw_ctx *hctx; 116 }; 117 118 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data) 119 { 120 if (data->flags & BLK_MQ_REQ_INTERNAL) 121 return data->hctx->sched_tags; 122 123 return data->hctx->tags; 124 } 125 126 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx) 127 { 128 return test_bit(BLK_MQ_S_STOPPED, &hctx->state); 129 } 130 131 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) 132 { 133 return hctx->nr_ctx && hctx->tags; 134 } 135 136 #endif 137