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 delayed_work
;
23 unsigned long flags
; /* BLK_MQ_F_* flags */
25 struct request_queue
*queue
;
26 unsigned int queue_num
;
31 struct blk_mq_ctx
**ctxs
;
32 unsigned int nr_ctx_map
;
33 unsigned long *ctx_map
;
36 struct list_head page_list
;
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 queue_depth
;
45 unsigned int numa_node
;
46 unsigned int cmd_size
; /* per-request extra data */
48 struct blk_mq_cpu_notifier cpu_notifier
;
53 struct blk_mq_ops
*ops
;
54 unsigned int nr_hw_queues
;
55 unsigned int queue_depth
;
56 unsigned int reserved_tags
;
57 unsigned int cmd_size
; /* per-request extra data */
60 unsigned int flags
; /* BLK_MQ_F_* */
63 typedef int (queue_rq_fn
)(struct blk_mq_hw_ctx
*, struct request
*);
64 typedef struct blk_mq_hw_ctx
*(map_queue_fn
)(struct request_queue
*, const int);
65 typedef struct blk_mq_hw_ctx
*(alloc_hctx_fn
)(struct blk_mq_reg
*,unsigned int);
66 typedef void (free_hctx_fn
)(struct blk_mq_hw_ctx
*, unsigned int);
67 typedef int (init_hctx_fn
)(struct blk_mq_hw_ctx
*, void *, unsigned int);
68 typedef void (exit_hctx_fn
)(struct blk_mq_hw_ctx
*, unsigned int);
74 queue_rq_fn
*queue_rq
;
77 * Map to specific hardware queue
79 map_queue_fn
*map_queue
;
82 * Called on request timeout
84 rq_timed_out_fn
*timeout
;
86 softirq_done_fn
*complete
;
89 * Override for hctx allocations (should probably go)
91 alloc_hctx_fn
*alloc_hctx
;
92 free_hctx_fn
*free_hctx
;
95 * Called when the block layer side of a hardware queue has been
96 * set up, allowing the driver to allocate/init matching structures.
97 * Ditto for exit/teardown.
99 init_hctx_fn
*init_hctx
;
100 exit_hctx_fn
*exit_hctx
;
104 BLK_MQ_RQ_QUEUE_OK
= 0, /* queued fine */
105 BLK_MQ_RQ_QUEUE_BUSY
= 1, /* requeue IO for later */
106 BLK_MQ_RQ_QUEUE_ERROR
= 2, /* end IO with error */
108 BLK_MQ_F_SHOULD_MERGE
= 1 << 0,
109 BLK_MQ_F_SHOULD_SORT
= 1 << 1,
110 BLK_MQ_F_SHOULD_IPI
= 1 << 2,
112 BLK_MQ_S_STOPPED
= 1 << 0,
114 BLK_MQ_MAX_DEPTH
= 2048,
117 struct request_queue
*blk_mq_init_queue(struct blk_mq_reg
*, void *);
118 int blk_mq_register_disk(struct gendisk
*);
119 void blk_mq_unregister_disk(struct gendisk
*);
120 void blk_mq_init_commands(struct request_queue
*, void (*init
)(void *data
, struct blk_mq_hw_ctx
*, struct request
*, unsigned int), void *data
);
122 void blk_mq_flush_plug_list(struct blk_plug
*plug
, bool from_schedule
);
124 void blk_mq_insert_request(struct request
*, bool, bool, bool);
125 void blk_mq_run_queues(struct request_queue
*q
, bool async
);
126 void blk_mq_free_request(struct request
*rq
);
127 bool blk_mq_can_queue(struct blk_mq_hw_ctx
*);
128 struct request
*blk_mq_alloc_request(struct request_queue
*q
, int rw
, gfp_t gfp
);
129 struct request
*blk_mq_alloc_reserved_request(struct request_queue
*q
, int rw
, gfp_t gfp
);
130 struct request
*blk_mq_rq_from_tag(struct request_queue
*q
, unsigned int tag
);
132 struct blk_mq_hw_ctx
*blk_mq_map_queue(struct request_queue
*, const int ctx_index
);
133 struct blk_mq_hw_ctx
*blk_mq_alloc_single_hw_queue(struct blk_mq_reg
*, unsigned int);
134 void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx
*, unsigned int);
136 bool blk_mq_end_io_partial(struct request
*rq
, int error
,
137 unsigned int nr_bytes
);
138 static inline void blk_mq_end_io(struct request
*rq
, int error
)
140 bool done
= !blk_mq_end_io_partial(rq
, error
, blk_rq_bytes(rq
));
144 void blk_mq_complete_request(struct request
*rq
);
146 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx
*hctx
);
147 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx
*hctx
);
148 void blk_mq_stop_hw_queues(struct request_queue
*q
);
149 void blk_mq_start_stopped_hw_queues(struct request_queue
*q
);
152 * Driver command data is immediately after the request. So subtract request
153 * size to get back to the original request.
155 static inline struct request
*blk_mq_rq_from_pdu(void *pdu
)
157 return pdu
- sizeof(struct request
);
159 static inline void *blk_mq_rq_to_pdu(struct request
*rq
)
161 return (void *) rq
+ sizeof(*rq
);
164 static inline struct request
*blk_mq_tag_to_rq(struct blk_mq_hw_ctx
*hctx
,
167 return hctx
->rqs
[tag
];
170 #define queue_for_each_hw_ctx(q, hctx, i) \
171 for ((i) = 0; (i) < (q)->nr_hw_queues && \
172 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
174 #define queue_for_each_ctx(q, ctx, i) \
175 for ((i) = 0; (i) < (q)->nr_queues && \
176 ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
178 #define hctx_for_each_ctx(hctx, ctx, i) \
179 for ((i) = 0; (i) < (hctx)->nr_ctx && \
180 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
182 #define blk_ctx_sum(q, sum) \
184 struct blk_mq_ctx *__x; \
185 unsigned int __ret = 0, __i; \
187 queue_for_each_ctx((q), __x, __i) \