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
{
17 unsigned int bits_per_word
;
18 struct blk_align_bitmap
*map
;
21 struct blk_mq_hw_ctx
{
24 struct list_head dispatch
;
25 unsigned long state
; /* BLK_MQ_S_* flags */
26 } ____cacheline_aligned_in_smp
;
28 struct work_struct run_work
;
29 cpumask_var_t cpumask
;
33 unsigned long flags
; /* BLK_MQ_F_* flags */
35 struct request_queue
*queue
;
36 struct blk_flush_queue
*fq
;
40 struct blk_mq_ctxmap ctx_map
;
42 struct blk_mq_ctx
**ctxs
;
47 struct blk_mq_tags
*tags
;
51 #define BLK_MQ_MAX_DISPATCH_ORDER 7
52 unsigned long dispatched
[BLK_MQ_MAX_DISPATCH_ORDER
];
54 unsigned int numa_node
;
55 unsigned int queue_num
;
59 struct delayed_work delay_work
;
61 struct blk_mq_cpu_notifier cpu_notifier
;
64 unsigned long poll_invoked
;
65 unsigned long poll_success
;
68 struct blk_mq_tag_set
{
69 struct blk_mq_ops
*ops
;
70 unsigned int nr_hw_queues
;
71 unsigned int queue_depth
; /* max hw supported */
72 unsigned int reserved_tags
;
73 unsigned int cmd_size
; /* per-request extra data */
76 unsigned int flags
; /* BLK_MQ_F_* */
79 struct blk_mq_tags
**tags
;
81 struct mutex tag_list_lock
;
82 struct list_head tag_list
;
85 struct blk_mq_queue_data
{
87 struct list_head
*list
;
91 typedef int (queue_rq_fn
)(struct blk_mq_hw_ctx
*, const struct blk_mq_queue_data
*);
92 typedef struct blk_mq_hw_ctx
*(map_queue_fn
)(struct request_queue
*, const int);
93 typedef enum blk_eh_timer_return (timeout_fn
)(struct request
*, bool);
94 typedef int (init_hctx_fn
)(struct blk_mq_hw_ctx
*, void *, unsigned int);
95 typedef void (exit_hctx_fn
)(struct blk_mq_hw_ctx
*, unsigned int);
96 typedef int (init_request_fn
)(void *, struct request
*, unsigned int,
97 unsigned int, unsigned int);
98 typedef void (exit_request_fn
)(void *, struct request
*, unsigned int,
100 typedef int (reinit_request_fn
)(void *, struct request
*);
102 typedef void (busy_iter_fn
)(struct blk_mq_hw_ctx
*, struct request
*, void *,
104 typedef void (busy_tag_iter_fn
)(struct request
*, void *, bool);
105 typedef int (poll_fn
)(struct blk_mq_hw_ctx
*, unsigned int);
112 queue_rq_fn
*queue_rq
;
115 * Map to specific hardware queue
117 map_queue_fn
*map_queue
;
120 * Called on request timeout
125 * Called to poll for completion of a specific tag.
129 softirq_done_fn
*complete
;
132 * Called when the block layer side of a hardware queue has been
133 * set up, allowing the driver to allocate/init matching structures.
134 * Ditto for exit/teardown.
136 init_hctx_fn
*init_hctx
;
137 exit_hctx_fn
*exit_hctx
;
140 * Called for every command allocated by the block layer to allow
141 * the driver to set up driver specific data.
143 * Tag greater than or equal to queue_depth is for setting up
146 * Ditto for exit/teardown.
148 init_request_fn
*init_request
;
149 exit_request_fn
*exit_request
;
150 reinit_request_fn
*reinit_request
;
154 BLK_MQ_RQ_QUEUE_OK
= 0, /* queued fine */
155 BLK_MQ_RQ_QUEUE_BUSY
= 1, /* requeue IO for later */
156 BLK_MQ_RQ_QUEUE_ERROR
= 2, /* end IO with error */
158 BLK_MQ_F_SHOULD_MERGE
= 1 << 0,
159 BLK_MQ_F_TAG_SHARED
= 1 << 1,
160 BLK_MQ_F_SG_MERGE
= 1 << 2,
161 BLK_MQ_F_DEFER_ISSUE
= 1 << 4,
162 BLK_MQ_F_ALLOC_POLICY_START_BIT
= 8,
163 BLK_MQ_F_ALLOC_POLICY_BITS
= 1,
165 BLK_MQ_S_STOPPED
= 0,
166 BLK_MQ_S_TAG_ACTIVE
= 1,
168 BLK_MQ_MAX_DEPTH
= 10240,
170 BLK_MQ_CPU_WORK_BATCH
= 8,
172 #define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
173 ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
174 ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
175 #define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
176 ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
177 << BLK_MQ_F_ALLOC_POLICY_START_BIT)
179 struct request_queue
*blk_mq_init_queue(struct blk_mq_tag_set
*);
180 struct request_queue
*blk_mq_init_allocated_queue(struct blk_mq_tag_set
*set
,
181 struct request_queue
*q
);
182 int blk_mq_register_disk(struct gendisk
*);
183 void blk_mq_unregister_disk(struct gendisk
*);
185 int blk_mq_alloc_tag_set(struct blk_mq_tag_set
*set
);
186 void blk_mq_free_tag_set(struct blk_mq_tag_set
*set
);
188 void blk_mq_flush_plug_list(struct blk_plug
*plug
, bool from_schedule
);
190 void blk_mq_insert_request(struct request
*, bool, bool, bool);
191 void blk_mq_free_request(struct request
*rq
);
192 void blk_mq_free_hctx_request(struct blk_mq_hw_ctx
*, struct request
*rq
);
193 bool blk_mq_can_queue(struct blk_mq_hw_ctx
*);
196 BLK_MQ_REQ_NOWAIT
= (1 << 0), /* return when out of requests */
197 BLK_MQ_REQ_RESERVED
= (1 << 1), /* allocate from reserved pool */
200 struct request
*blk_mq_alloc_request(struct request_queue
*q
, int rw
,
202 struct request
*blk_mq_alloc_request_hctx(struct request_queue
*q
, int op
,
203 unsigned int flags
, unsigned int hctx_idx
);
204 struct request
*blk_mq_tag_to_rq(struct blk_mq_tags
*tags
, unsigned int tag
);
205 struct cpumask
*blk_mq_tags_cpumask(struct blk_mq_tags
*tags
);
208 BLK_MQ_UNIQUE_TAG_BITS
= 16,
209 BLK_MQ_UNIQUE_TAG_MASK
= (1 << BLK_MQ_UNIQUE_TAG_BITS
) - 1,
212 u32
blk_mq_unique_tag(struct request
*rq
);
214 static inline u16
blk_mq_unique_tag_to_hwq(u32 unique_tag
)
216 return unique_tag
>> BLK_MQ_UNIQUE_TAG_BITS
;
219 static inline u16
blk_mq_unique_tag_to_tag(u32 unique_tag
)
221 return unique_tag
& BLK_MQ_UNIQUE_TAG_MASK
;
224 struct blk_mq_hw_ctx
*blk_mq_map_queue(struct request_queue
*, const int ctx_index
);
225 struct blk_mq_hw_ctx
*blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set
*, unsigned int, int);
227 int blk_mq_request_started(struct request
*rq
);
228 void blk_mq_start_request(struct request
*rq
);
229 void blk_mq_end_request(struct request
*rq
, int error
);
230 void __blk_mq_end_request(struct request
*rq
, int error
);
232 void blk_mq_requeue_request(struct request
*rq
);
233 void blk_mq_add_to_requeue_list(struct request
*rq
, bool at_head
);
234 void blk_mq_cancel_requeue_work(struct request_queue
*q
);
235 void blk_mq_kick_requeue_list(struct request_queue
*q
);
236 void blk_mq_abort_requeue_list(struct request_queue
*q
);
237 void blk_mq_complete_request(struct request
*rq
, int error
);
239 void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx
*hctx
);
240 void blk_mq_start_hw_queue(struct blk_mq_hw_ctx
*hctx
);
241 void blk_mq_stop_hw_queues(struct request_queue
*q
);
242 void blk_mq_start_hw_queues(struct request_queue
*q
);
243 void blk_mq_start_stopped_hw_queues(struct request_queue
*q
, bool async
);
244 void blk_mq_run_hw_queues(struct request_queue
*q
, bool async
);
245 void blk_mq_delay_queue(struct blk_mq_hw_ctx
*hctx
, unsigned long msecs
);
246 void blk_mq_tagset_busy_iter(struct blk_mq_tag_set
*tagset
,
247 busy_tag_iter_fn
*fn
, void *priv
);
248 void blk_mq_freeze_queue(struct request_queue
*q
);
249 void blk_mq_unfreeze_queue(struct request_queue
*q
);
250 void blk_mq_freeze_queue_start(struct request_queue
*q
);
251 int blk_mq_reinit_tagset(struct blk_mq_tag_set
*set
);
253 void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set
*set
, int nr_hw_queues
);
256 * Driver command data is immediately after the request. So subtract request
257 * size to get back to the original request, add request size to get the PDU.
259 static inline struct request
*blk_mq_rq_from_pdu(void *pdu
)
261 return pdu
- sizeof(struct request
);
263 static inline void *blk_mq_rq_to_pdu(struct request
*rq
)
268 #define queue_for_each_hw_ctx(q, hctx, i) \
269 for ((i) = 0; (i) < (q)->nr_hw_queues && \
270 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
272 #define hctx_for_each_ctx(hctx, ctx, i) \
273 for ((i) = 0; (i) < (hctx)->nr_ctx && \
274 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)