4 #include <linux/blkdev.h>
8 struct blk_mq_cpu_notifier {
11 void (*notify)(void *data, unsigned long action, unsigned int cpu);
14 struct blk_mq_hw_ctx {
17 struct list_head dispatch;
18 } ____cacheline_aligned_in_smp;
20 unsigned long state; /* BLK_MQ_S_* flags */
21 struct delayed_work run_work;
22 struct delayed_work delay_work;
23 cpumask_var_t cpumask;
25 unsigned long flags; /* BLK_MQ_F_* flags */
27 struct request_queue *queue;
28 unsigned int queue_num;
33 struct blk_mq_ctx **ctxs;
34 unsigned int nr_ctx_map;
35 unsigned long *ctx_map;
37 struct blk_mq_tags *tags;
41 #define BLK_MQ_MAX_DISPATCH_ORDER 10
42 unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
44 unsigned int numa_node;
45 unsigned int cmd_size; /* per-request extra data */
47 struct blk_mq_cpu_notifier cpu_notifier;
51 struct blk_mq_tag_set {
52 struct blk_mq_ops *ops;
53 unsigned int nr_hw_queues;
54 unsigned int queue_depth;
55 unsigned int reserved_tags;
56 unsigned int cmd_size; /* per-request extra data */
59 unsigned int flags; /* BLK_MQ_F_* */
62 struct blk_mq_tags **tags;
65 typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *);
66 typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
67 typedef struct blk_mq_hw_ctx *(alloc_hctx_fn)(struct blk_mq_tag_set *,
69 typedef void (free_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
70 typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
71 typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
72 typedef int (init_request_fn)(void *, struct request *, unsigned int,
73 unsigned int, unsigned int);
74 typedef void (exit_request_fn)(void *, struct request *, unsigned int,
81 queue_rq_fn *queue_rq;
84 * Map to specific hardware queue
86 map_queue_fn *map_queue;
89 * Called on request timeout
91 rq_timed_out_fn *timeout;
93 softirq_done_fn *complete;
96 * Override for hctx allocations (should probably go)
98 alloc_hctx_fn *alloc_hctx;
99 free_hctx_fn *free_hctx;
102 * Called when the block layer side of a hardware queue has been
103 * set up, allowing the driver to allocate/init matching structures.
104 * Ditto for exit/teardown.
106 init_hctx_fn *init_hctx;
107 exit_hctx_fn *exit_hctx;
110 * Called for every command allocated by the block layer to allow
111 * the driver to set up driver specific data.
112 * Ditto for exit/teardown.
114 init_request_fn *init_request;
115 exit_request_fn *exit_request;
119 BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
120 BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
121 BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
123 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
124 BLK_MQ_F_SHOULD_SORT = 1 << 1,
125 BLK_MQ_F_SHOULD_IPI = 1 << 2,
127 BLK_MQ_S_STOPPED = 0,
129 BLK_MQ_MAX_DEPTH = 2048,
132 struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
133 int blk_mq_register_disk(struct gendisk *);
134 void blk_mq_unregister_disk(struct gendisk *);
136 int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
137 void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
139 void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
141 void blk_mq_insert_request(struct request *, bool, bool, bool);
142 void blk_mq_run_queues(struct request_queue *q, bool async);
143 void blk_mq_free_request(struct request *rq);
144 bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
145 struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp);
146 struct request *blk_mq_alloc_reserved_request(struct request_queue *q, int rw, gfp_t gfp);
147 struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
149 struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
150 struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int);
151 void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int);
153 void blk_mq_end_io(struct request *rq, int error);
154 void __blk_mq_end_io(struct request *rq, int error);
156 void blk_mq_complete_request(struct request *rq);
158 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
159 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
160 void blk_mq_stop_hw_queues(struct request_queue *q);
161 void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
162 void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
165 * Driver command data is immediately after the request. So subtract request
166 * size to get back to the original request.
168 static inline struct request *blk_mq_rq_from_pdu(void *pdu)
170 return pdu - sizeof(struct request);
172 static inline void *blk_mq_rq_to_pdu(struct request *rq)
174 return (void *) rq + sizeof(*rq);
177 #define queue_for_each_hw_ctx(q, hctx, i) \
178 for ((i) = 0; (i) < (q)->nr_hw_queues && \
179 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
181 #define queue_for_each_ctx(q, ctx, i) \
182 for ((i) = 0; (i) < (q)->nr_queues && \
183 ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
185 #define hctx_for_each_ctx(hctx, ctx, i) \
186 for ((i) = 0; (i) < (hctx)->nr_ctx && \
187 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
189 #define blk_ctx_sum(q, sum) \
191 struct blk_mq_ctx *__x; \
192 unsigned int __ret = 0, __i; \
194 queue_for_each_ctx((q), __x, __i) \