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 * CPU hotplug helpers 61 */ 62 void blk_mq_enable_hotplug(void); 63 void blk_mq_disable_hotplug(void); 64 65 /* 66 * CPU -> queue mappings 67 */ 68 extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int); 69 70 static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, 71 int cpu) 72 { 73 return q->queue_hw_ctx[q->mq_map[cpu]]; 74 } 75 76 /* 77 * sysfs helpers 78 */ 79 extern void blk_mq_sysfs_init(struct request_queue *q); 80 extern void blk_mq_sysfs_deinit(struct request_queue *q); 81 extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q); 82 extern int blk_mq_sysfs_register(struct request_queue *q); 83 extern void blk_mq_sysfs_unregister(struct request_queue *q); 84 extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx); 85 86 /* 87 * debugfs helpers 88 */ 89 #ifdef CONFIG_BLK_DEBUG_FS 90 int blk_mq_debugfs_register(struct request_queue *q); 91 void blk_mq_debugfs_unregister(struct request_queue *q); 92 int blk_mq_debugfs_register_mq(struct request_queue *q); 93 void blk_mq_debugfs_unregister_mq(struct request_queue *q); 94 #else 95 static inline int blk_mq_debugfs_register(struct request_queue *q) 96 { 97 return 0; 98 } 99 100 static inline void blk_mq_debugfs_unregister(struct request_queue *q) 101 { 102 } 103 104 static inline int blk_mq_debugfs_register_mq(struct request_queue *q) 105 { 106 return 0; 107 } 108 109 static inline void blk_mq_debugfs_unregister_mq(struct request_queue *q) 110 { 111 } 112 #endif 113 114 extern void blk_mq_rq_timed_out(struct request *req, bool reserved); 115 116 void blk_mq_release(struct request_queue *q); 117 118 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, 119 unsigned int cpu) 120 { 121 return per_cpu_ptr(q->queue_ctx, cpu); 122 } 123 124 /* 125 * This assumes per-cpu software queueing queues. They could be per-node 126 * as well, for instance. For now this is hardcoded as-is. Note that we don't 127 * care about preemption, since we know the ctx's are persistent. This does 128 * mean that we can't rely on ctx always matching the currently running CPU. 129 */ 130 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) 131 { 132 return __blk_mq_get_ctx(q, get_cpu()); 133 } 134 135 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) 136 { 137 put_cpu(); 138 } 139 140 struct blk_mq_alloc_data { 141 /* input parameter */ 142 struct request_queue *q; 143 unsigned int flags; 144 unsigned int shallow_depth; 145 146 /* input & output parameter */ 147 struct blk_mq_ctx *ctx; 148 struct blk_mq_hw_ctx *hctx; 149 }; 150 151 static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data) 152 { 153 if (data->flags & BLK_MQ_REQ_INTERNAL) 154 return data->hctx->sched_tags; 155 156 return data->hctx->tags; 157 } 158 159 /* 160 * Internal helpers for request allocation/init/free 161 */ 162 void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, 163 struct request *rq, unsigned int op); 164 void __blk_mq_finish_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, 165 struct request *rq); 166 void blk_mq_finish_request(struct request *rq); 167 struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data, 168 unsigned int op); 169 170 static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx) 171 { 172 return test_bit(BLK_MQ_S_STOPPED, &hctx->state); 173 } 174 175 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) 176 { 177 return hctx->nr_ctx && hctx->tags; 178 } 179 180 #endif 181