4 #include <linux/blkdev.h>
7 struct blk_flush_queue
;
9 struct blk_mq_cpu_notifier
{
10 struct list_head list
;
12 int (*notify
)(void *data
, unsigned long action
, unsigned int cpu
);
15 struct blk_mq_ctxmap
{
16 unsigned int map_size
;
17 unsigned int bits_per_word
;
18 struct blk_align_bitmap
*map
;
21 struct blk_mq_hw_ctx
{
24 struct list_head dispatch
;
25 } ____cacheline_aligned_in_smp
;
27 unsigned long state
; /* BLK_MQ_S_* flags */
28 struct delayed_work run_work
;
29 struct delayed_work delay_work
;
30 cpumask_var_t cpumask
;
34 unsigned long flags
; /* BLK_MQ_F_* flags */
36 struct request_queue
*queue
;
37 unsigned int queue_num
;
38 struct blk_flush_queue
*fq
;
42 struct blk_mq_ctxmap ctx_map
;
45 struct blk_mq_ctx
**ctxs
;
49 struct blk_mq_tags
*tags
;
53 #define BLK_MQ_MAX_DISPATCH_ORDER 10
54 unsigned long dispatched
[BLK_MQ_MAX_DISPATCH_ORDER
];
56 unsigned int numa_node
;
57 unsigned int cmd_size
; /* per-request extra data */
61 struct blk_mq_cpu_notifier cpu_notifier
;
65 struct blk_mq_tag_set
{
66 struct blk_mq_ops
*ops
;
67 unsigned int nr_hw_queues
;
68 unsigned int queue_depth
; /* max hw supported */
69 unsigned int reserved_tags
;
70 unsigned int cmd_size
; /* per-request extra data */
73 unsigned int flags
; /* BLK_MQ_F_* */
76 struct blk_mq_tags
**tags
;
78 struct mutex tag_list_lock
;
79 struct list_head tag_list
;
82 typedef int (queue_rq_fn
)(struct blk_mq_hw_ctx
*, struct request
*, bool);
83 typedef struct blk_mq_hw_ctx
*(map_queue_fn
)(struct request_queue
*, const int);
84 typedef enum blk_eh_timer_return (timeout_fn
)(struct request
*, bool);
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,
92 typedef void (busy_iter_fn
)(struct blk_mq_hw_ctx
*, struct request
*, void *,
99 queue_rq_fn
*queue_rq
;
102 * Map to specific hardware queue
104 map_queue_fn
*map_queue
;
107 * Called on request timeout
111 softirq_done_fn
*complete
;
114 * Called when the block layer side of a hardware queue has been
115 * set up, allowing the driver to allocate/init matching structures.
116 * Ditto for exit/teardown.
118 init_hctx_fn
*init_hctx
;
119 exit_hctx_fn
*exit_hctx
;
122 * Called for every command allocated by the block layer to allow
123 * the driver to set up driver specific data.
125 * Tag greater than or equal to queue_depth is for setting up
128 * Ditto for exit/teardown.
130 init_request_fn
*init_request
;
131 exit_request_fn
*exit_request
;
135 BLK_MQ_RQ_QUEUE_OK
= 0, /* queued fine */
136 BLK_MQ_RQ_QUEUE_BUSY
= 1, /* requeue IO for later */
137 BLK_MQ_RQ_QUEUE_ERROR
= 2, /* end IO with error */
139 BLK_MQ_F_SHOULD_MERGE
= 1 << 0,
140 BLK_MQ_F_TAG_SHARED
= 1 << 1,
141 BLK_MQ_F_SG_MERGE
= 1 << 2,
142 BLK_MQ_F_SYSFS_UP
= 1 << 3,
144 BLK_MQ_S_STOPPED
= 0,
145 BLK_MQ_S_TAG_ACTIVE
= 1,
147 BLK_MQ_MAX_DEPTH
= 10240,
149 BLK_MQ_CPU_WORK_BATCH
= 8,
152 struct request_queue
*blk_mq_init_queue(struct blk_mq_tag_set
*);
153 void blk_mq_finish_init(struct request_queue
*q
);
154 int blk_mq_register_disk(struct gendisk
*);
155 void blk_mq_unregister_disk(struct gendisk
*);
157 int blk_mq_alloc_tag_set(struct blk_mq_tag_set
*set
);
158 void blk_mq_free_tag_set(struct blk_mq_tag_set
*set
);
160 void blk_mq_flush_plug_list(struct blk_plug
*plug
, bool from_schedule
);
162 void blk_mq_insert_request(struct request
*, bool, bool, bool);
163 void blk_mq_run_queues(struct request_queue
*q
, bool async
);
164 void blk_mq_free_request(struct request
*rq
);
165 bool blk_mq_can_queue(struct blk_mq_hw_ctx
*);
166 struct request
*blk_mq_alloc_request(struct request_queue
*q
, int rw
,
167 gfp_t gfp
, bool reserved
);
168 struct request
*blk_mq_tag_to_rq(struct blk_mq_tags
*tags
, unsigned int tag
);
171 BLK_MQ_UNIQUE_TAG_BITS
= 16,
172 BLK_MQ_UNIQUE_TAG_MASK
= (1 << BLK_MQ_UNIQUE_TAG_BITS
) - 1,
175 u32
blk_mq_unique_tag(struct request
*rq
);
177 static inline u16
blk_mq_unique_tag_to_hwq(u32 unique_tag
)
179 return unique_tag
>> BLK_MQ_UNIQUE_TAG_BITS
;
182 static inline u16
blk_mq_unique_tag_to_tag(u32 unique_tag
)
184 return unique_tag
& BLK_MQ_UNIQUE_TAG_MASK
;
187 struct blk_mq_hw_ctx
*blk_mq_map_queue(struct request_queue
*, const int ctx_index
);
188 struct blk_mq_hw_ctx
*blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set
*, unsigned int, int);
190 void blk_mq_start_request(struct request
*rq
);
191 void blk_mq_end_request(struct request
*rq
, int error
);
192 void __blk_mq_end_request(struct request
*rq
, int error
);
194 void blk_mq_requeue_request(struct request
*rq
);
195 void blk_mq_add_to_requeue_list(struct request
*rq
, bool at_head
);
196 void blk_mq_kick_requeue_list(struct request_queue
*q
);
197 void blk_mq_complete_request(struct request
*rq
);
199 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx
*hctx
);
200 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx
*hctx
);
201 void blk_mq_stop_hw_queues(struct request_queue
*q
);
202 void blk_mq_start_hw_queues(struct request_queue
*q
);
203 void blk_mq_start_stopped_hw_queues(struct request_queue
*q
, bool async
);
204 void blk_mq_delay_queue(struct blk_mq_hw_ctx
*hctx
, unsigned long msecs
);
205 void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx
*hctx
, busy_iter_fn
*fn
,
209 * Driver command data is immediately after the request. So subtract request
210 * size to get back to the original request.
212 static inline struct request
*blk_mq_rq_from_pdu(void *pdu
)
214 return pdu
- sizeof(struct request
);
216 static inline void *blk_mq_rq_to_pdu(struct request
*rq
)
218 return (void *) rq
+ sizeof(*rq
);
221 #define queue_for_each_hw_ctx(q, hctx, i) \
222 for ((i) = 0; (i) < (q)->nr_hw_queues && \
223 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
225 #define queue_for_each_ctx(q, ctx, i) \
226 for ((i) = 0; (i) < (q)->nr_queues && \
227 ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
229 #define hctx_for_each_ctx(hctx, ctx, i) \
230 for ((i) = 0; (i) < (hctx)->nr_ctx && \
231 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
233 #define blk_ctx_sum(q, sum) \
235 struct blk_mq_ctx *__x; \
236 unsigned int __ret = 0, __i; \
238 queue_for_each_ctx((q), __x, __i) \