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;
27 unsigned long flags; /* BLK_MQ_F_* flags */
29 struct request_queue *queue;
30 unsigned int queue_num;
34 unsigned int nr_ctx_map;
35 unsigned long *ctx_map;
37 struct blk_mq_ctx **ctxs;
39 unsigned int wait_index;
41 struct blk_mq_tags *tags;
45 #define BLK_MQ_MAX_DISPATCH_ORDER 10
46 unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
48 unsigned int numa_node;
49 unsigned int cmd_size; /* per-request extra data */
53 struct blk_mq_cpu_notifier cpu_notifier;
57 struct blk_mq_tag_set {
58 struct blk_mq_ops *ops;
59 unsigned int nr_hw_queues;
60 unsigned int queue_depth;
61 unsigned int reserved_tags;
62 unsigned int cmd_size; /* per-request extra data */
65 unsigned int flags; /* BLK_MQ_F_* */
68 struct blk_mq_tags **tags;
70 struct mutex tag_list_lock;
71 struct list_head tag_list;
74 typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *);
75 typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
76 typedef struct blk_mq_hw_ctx *(alloc_hctx_fn)(struct blk_mq_tag_set *,
78 typedef void (free_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
79 typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
80 typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
81 typedef int (init_request_fn)(void *, struct request *, unsigned int,
82 unsigned int, unsigned int);
83 typedef void (exit_request_fn)(void *, struct request *, unsigned int,
90 queue_rq_fn *queue_rq;
93 * Map to specific hardware queue
95 map_queue_fn *map_queue;
98 * Called on request timeout
100 rq_timed_out_fn *timeout;
102 softirq_done_fn *complete;
105 * Override for hctx allocations (should probably go)
107 alloc_hctx_fn *alloc_hctx;
108 free_hctx_fn *free_hctx;
111 * Called when the block layer side of a hardware queue has been
112 * set up, allowing the driver to allocate/init matching structures.
113 * Ditto for exit/teardown.
115 init_hctx_fn *init_hctx;
116 exit_hctx_fn *exit_hctx;
119 * Called for every command allocated by the block layer to allow
120 * the driver to set up driver specific data.
121 * Ditto for exit/teardown.
123 init_request_fn *init_request;
124 exit_request_fn *exit_request;
128 BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
129 BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
130 BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
132 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
133 BLK_MQ_F_SHOULD_SORT = 1 << 1,
134 BLK_MQ_F_TAG_SHARED = 1 << 2,
136 BLK_MQ_S_STOPPED = 0,
137 BLK_MQ_S_TAG_ACTIVE = 1,
139 BLK_MQ_MAX_DEPTH = 2048,
141 BLK_MQ_CPU_WORK_BATCH = 8,
144 struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
145 int blk_mq_register_disk(struct gendisk *);
146 void blk_mq_unregister_disk(struct gendisk *);
148 int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
149 void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
151 void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
153 void blk_mq_insert_request(struct request *, bool, bool, bool);
154 void blk_mq_run_queues(struct request_queue *q, bool async);
155 void blk_mq_free_request(struct request *rq);
156 bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
157 struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp);
158 struct request *blk_mq_alloc_reserved_request(struct request_queue *q, int rw, gfp_t gfp);
159 struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
161 struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
162 struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int);
163 void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int);
165 void blk_mq_end_io(struct request *rq, int error);
166 void __blk_mq_end_io(struct request *rq, int error);
168 void blk_mq_requeue_request(struct request *rq);
170 void blk_mq_complete_request(struct request *rq);
172 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
173 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
174 void blk_mq_stop_hw_queues(struct request_queue *q);
175 void blk_mq_start_hw_queues(struct request_queue *q);
176 void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
177 void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
180 * Driver command data is immediately after the request. So subtract request
181 * size to get back to the original request.
183 static inline struct request *blk_mq_rq_from_pdu(void *pdu)
185 return pdu - sizeof(struct request);
187 static inline void *blk_mq_rq_to_pdu(struct request *rq)
189 return (void *) rq + sizeof(*rq);
192 #define queue_for_each_hw_ctx(q, hctx, i) \
193 for ((i) = 0; (i) < (q)->nr_hw_queues && \
194 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
196 #define queue_for_each_ctx(q, ctx, i) \
197 for ((i) = 0; (i) < (q)->nr_queues && \
198 ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
200 #define hctx_for_each_ctx(hctx, ctx, i) \
201 for ((i) = 0; (i) < (hctx)->nr_ctx && \
202 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
204 #define blk_ctx_sum(q, sum) \
206 struct blk_mq_ctx *__x; \
207 unsigned int __ret = 0, __i; \
209 queue_for_each_ctx((q), __x, __i) \