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Commit 2c3ad667 authored by Jens Axboe's avatar Jens Axboe
Browse files

blk-mq: export some helpers we need to the scheduling framework 



Signed-off-by: default avatarJens Axboe <axboe@fb.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarOmar Sandoval <osandov@fb.com>
parent 16a3c2a7

block/blk-mq.c

+21 −18
Original line number Diff line number Diff line
@@ -167,7 +167,7 @@ bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) 
}

EXPORT_SYMBOL(blk_mq_can_queue);



static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,

void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,

			struct request *rq, unsigned int op)

{

	INIT_LIST_HEAD(&rq->queuelist);
@@ -213,9 +213,10 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, 


	ctx->rq_dispatched[op_is_sync(op)]++;

}

EXPORT_SYMBOL_GPL(blk_mq_rq_ctx_init);



static struct request *

__blk_mq_alloc_request(struct blk_mq_alloc_data *data, unsigned int op)

struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,

				       unsigned int op)

{

	struct request *rq;

	unsigned int tag;
@@ -236,6 +237,7 @@ __blk_mq_alloc_request(struct blk_mq_alloc_data *data, unsigned int op) 


	return NULL;

}

EXPORT_SYMBOL_GPL(__blk_mq_alloc_request);



struct request *blk_mq_alloc_request(struct request_queue *q, int rw,

		unsigned int flags)
@@ -319,8 +321,8 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw, 
}

EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx);



static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx,

				  struct blk_mq_ctx *ctx, struct request *rq)

void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,

			   struct request *rq)

{

	const int tag = rq->tag;

	struct request_queue *q = rq->q;
@@ -802,7 +804,7 @@ static bool flush_busy_ctx(struct sbitmap *sb, unsigned int bitnr, void *data) 
 * Process software queues that have been marked busy, splicing them

 * to the for-dispatch

 */

static void flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)

void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)

{

	struct flush_busy_ctx_data data = {

		.hctx = hctx,
@@ -811,6 +813,7 @@ static void flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list) 


	sbitmap_for_each_set(&hctx->ctx_map, flush_busy_ctx, &data);

}

EXPORT_SYMBOL_GPL(blk_mq_flush_busy_ctxs);



static inline unsigned int queued_to_index(unsigned int queued)

{
@@ -921,7 +924,7 @@ static void blk_mq_process_rq_list(struct blk_mq_hw_ctx *hctx) 
	/*

	 * Touch any software queue that has pending entries.

	 */

	flush_busy_ctxs(hctx, &rq_list);

	blk_mq_flush_busy_ctxs(hctx, &rq_list);



	/*

	 * If we have previous entries on our dispatch list, grab them
@@ -1135,8 +1138,8 @@ static inline void __blk_mq_insert_req_list(struct blk_mq_hw_ctx *hctx, 
		list_add_tail(&rq->queuelist, &ctx->rq_list);

}



static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx,

				    struct request *rq, bool at_head)

void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,

			     bool at_head)

{

	struct blk_mq_ctx *ctx = rq->mq_ctx;
@@ -1550,8 +1553,8 @@ static blk_qc_t blk_sq_make_request(struct request_queue *q, struct bio *bio) 
	return cookie;

}



static void blk_mq_free_rq_map(struct blk_mq_tag_set *set,

		struct blk_mq_tags *tags, unsigned int hctx_idx)

void blk_mq_free_rq_map(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,

			unsigned int hctx_idx)

{

	struct page *page;
@@ -1588,7 +1591,7 @@ static size_t order_to_size(unsigned int order) 
	return (size_t)PAGE_SIZE << order;

}



static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,

struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,

				       unsigned int hctx_idx)

{

	struct blk_mq_tags *tags;
@@ -2279,10 +2282,10 @@ static int blk_mq_queue_reinit_dead(unsigned int cpu) 
 * Now CPU1 is just onlined and a request is inserted into ctx1->rq_list

 * and set bit0 in pending bitmap as ctx1->index_hw is still zero.

 *

 * And then while running hw queue, flush_busy_ctxs() finds bit0 is set in

 * pending bitmap and tries to retrieve requests in hctx->ctxs[0]->rq_list.

 * But htx->ctxs[0] is a pointer to ctx0, so the request in ctx1->rq_list

 * is ignored.

 * And then while running hw queue, blk_mq_flush_busy_ctxs() finds bit0 is set

 * in pending bitmap and tries to retrieve requests in hctx->ctxs[0]->rq_list.

 * But htx->ctxs[0] is a pointer to ctx0, so the request in ctx1->rq_list is

 * ignored.

 */

static int blk_mq_queue_reinit_prepare(unsigned int cpu)

{

block/blk-mq.h

+25 −0
Original line number Diff line number Diff line
@@ -32,6 +32,21 @@ void blk_mq_free_queue(struct request_queue *q); 
int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);

void blk_mq_wake_waiters(struct request_queue *q);

bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *, struct list_head *);

void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);



/*

 * Internal helpers for allocating/freeing the request map

 */

void blk_mq_free_rq_map(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,

			unsigned int hctx_idx);

struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,

					unsigned int hctx_idx);



/*

 * Internal helpers for request insertion into sw queues

 */

void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,

				bool at_head);



/*

 * CPU hotplug helpers
@@ -103,6 +118,16 @@ static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data, 
	data->hctx = hctx;

}



/*

 * Internal helpers for request allocation/init/free

 */

void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,

			struct request *rq, unsigned int op);

void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,

				struct request *rq);

struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,

					unsigned int op);



static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)

{

	return test_bit(BLK_MQ_S_STOPPED, &hctx->state);