4 #include <linux/blkdev.h>
8 struct blk_mq_cpu_notifier {
11 int (*notify)(void *data, unsigned long action, unsigned int cpu);
14 struct blk_mq_ctxmap {
15 unsigned int map_size;
16 unsigned int bits_per_word;
17 struct blk_align_bitmap *map;
20 struct blk_mq_hw_ctx {
23 struct list_head dispatch;
24 } ____cacheline_aligned_in_smp;
26 unsigned long state; /* BLK_MQ_S_* flags */
27 struct delayed_work run_work;
28 struct delayed_work delay_work;
29 cpumask_var_t cpumask;
33 unsigned long flags; /* BLK_MQ_F_* flags */
35 struct request_queue *queue;
36 unsigned int queue_num;
40 struct blk_mq_ctxmap ctx_map;
43 struct blk_mq_ctx **ctxs;
45 unsigned int wait_index;
47 struct blk_mq_tags *tags;
51 #define BLK_MQ_MAX_DISPATCH_ORDER 10
52 unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
54 unsigned int numa_node;
55 unsigned int cmd_size; /* per-request extra data */
59 struct blk_mq_cpu_notifier cpu_notifier;
63 struct blk_mq_tag_set {
64 struct blk_mq_ops *ops;
65 unsigned int nr_hw_queues;
66 unsigned int queue_depth; /* max hw supported */
67 unsigned int reserved_tags;
68 unsigned int cmd_size; /* per-request extra data */
71 unsigned int flags; /* BLK_MQ_F_* */
74 struct blk_mq_tags **tags;
76 struct mutex tag_list_lock;
77 struct list_head tag_list;
80 typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *);
81 typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
82 typedef struct blk_mq_hw_ctx *(alloc_hctx_fn)(struct blk_mq_tag_set *,
84 typedef void (free_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
85 typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
86 typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
87 typedef int (init_request_fn)(void *, struct request *, unsigned int,
88 unsigned int, unsigned int);
89 typedef void (exit_request_fn)(void *, struct request *, unsigned int,
96 queue_rq_fn *queue_rq;
99 * Map to specific hardware queue
101 map_queue_fn *map_queue;
104 * Called on request timeout
106 rq_timed_out_fn *timeout;
108 softirq_done_fn *complete;
111 * Override for hctx allocations (should probably go)
113 alloc_hctx_fn *alloc_hctx;
114 free_hctx_fn *free_hctx;
117 * Called when the block layer side of a hardware queue has been
118 * set up, allowing the driver to allocate/init matching structures.
119 * Ditto for exit/teardown.
121 init_hctx_fn *init_hctx;
122 exit_hctx_fn *exit_hctx;
125 * Called for every command allocated by the block layer to allow
126 * the driver to set up driver specific data.
127 * Ditto for exit/teardown.
129 init_request_fn *init_request;
130 exit_request_fn *exit_request;
134 BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
135 BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
136 BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
138 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
139 BLK_MQ_F_SHOULD_SORT = 1 << 1,
140 BLK_MQ_F_TAG_SHARED = 1 << 2,
142 BLK_MQ_S_STOPPED = 0,
143 BLK_MQ_S_TAG_ACTIVE = 1,
145 BLK_MQ_MAX_DEPTH = 2048,
147 BLK_MQ_CPU_WORK_BATCH = 8,
150 struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
151 int blk_mq_register_disk(struct gendisk *);
152 void blk_mq_unregister_disk(struct gendisk *);
154 int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
155 void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
157 void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
159 void blk_mq_insert_request(struct request *, bool, bool, bool);
160 void blk_mq_run_queues(struct request_queue *q, bool async);
161 void blk_mq_free_request(struct request *rq);
162 bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
163 struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp);
164 struct request *blk_mq_alloc_reserved_request(struct request_queue *q, int rw, gfp_t gfp);
165 struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
167 struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
168 struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int);
169 void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int);
171 void blk_mq_end_io(struct request *rq, int error);
172 void __blk_mq_end_io(struct request *rq, int error);
174 void blk_mq_requeue_request(struct request *rq);
176 void blk_mq_complete_request(struct request *rq);
178 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
179 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
180 void blk_mq_stop_hw_queues(struct request_queue *q);
181 void blk_mq_start_hw_queues(struct request_queue *q);
182 void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
183 void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
186 * Driver command data is immediately after the request. So subtract request
187 * size to get back to the original request.
189 static inline struct request *blk_mq_rq_from_pdu(void *pdu)
191 return pdu - sizeof(struct request);
193 static inline void *blk_mq_rq_to_pdu(struct request *rq)
195 return (void *) rq + sizeof(*rq);
198 #define queue_for_each_hw_ctx(q, hctx, i) \
199 for ((i) = 0; (i) < (q)->nr_hw_queues && \
200 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
202 #define queue_for_each_ctx(q, ctx, i) \
203 for ((i) = 0; (i) < (q)->nr_queues && \
204 ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
206 #define hctx_for_each_ctx(hctx, ctx, i) \
207 for ((i) = 0; (i) < (hctx)->nr_ctx && \
208 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
210 #define blk_ctx_sum(q, sum) \
212 struct blk_mq_ctx *__x; \
213 unsigned int __ret = 0, __i; \
215 queue_for_each_ctx((q), __x, __i) \