blk-mq: export some helpers we need to the scheduling framework
Signed-off-by: Jens Axboe <axboe@fb.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Omar Sandoval <osandov@fb.com>
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@ -167,7 +167,7 @@ bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
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}
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EXPORT_SYMBOL(blk_mq_can_queue);
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static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
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void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
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struct request *rq, unsigned int op)
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{
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INIT_LIST_HEAD(&rq->queuelist);
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@ -213,9 +213,10 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
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ctx->rq_dispatched[op_is_sync(op)]++;
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}
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EXPORT_SYMBOL_GPL(blk_mq_rq_ctx_init);
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static struct request *
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__blk_mq_alloc_request(struct blk_mq_alloc_data *data, unsigned int op)
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struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,
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unsigned int op)
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{
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struct request *rq;
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unsigned int tag;
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@ -236,6 +237,7 @@ __blk_mq_alloc_request(struct blk_mq_alloc_data *data, unsigned int op)
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return NULL;
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}
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EXPORT_SYMBOL_GPL(__blk_mq_alloc_request);
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struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
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unsigned int flags)
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@ -319,8 +321,8 @@ out_queue_exit:
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}
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EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx);
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static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx,
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struct blk_mq_ctx *ctx, struct request *rq)
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void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
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struct request *rq)
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{
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const int tag = rq->tag;
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struct request_queue *q = rq->q;
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@ -802,7 +804,7 @@ static bool flush_busy_ctx(struct sbitmap *sb, unsigned int bitnr, void *data)
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* Process software queues that have been marked busy, splicing them
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* to the for-dispatch
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*/
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static void flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)
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void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)
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{
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struct flush_busy_ctx_data data = {
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.hctx = hctx,
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@ -811,6 +813,7 @@ static void flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)
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sbitmap_for_each_set(&hctx->ctx_map, flush_busy_ctx, &data);
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}
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EXPORT_SYMBOL_GPL(blk_mq_flush_busy_ctxs);
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static inline unsigned int queued_to_index(unsigned int queued)
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{
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@ -921,7 +924,7 @@ static void blk_mq_process_rq_list(struct blk_mq_hw_ctx *hctx)
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/*
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* Touch any software queue that has pending entries.
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*/
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flush_busy_ctxs(hctx, &rq_list);
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blk_mq_flush_busy_ctxs(hctx, &rq_list);
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/*
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* If we have previous entries on our dispatch list, grab them
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@ -1135,8 +1138,8 @@ static inline void __blk_mq_insert_req_list(struct blk_mq_hw_ctx *hctx,
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list_add_tail(&rq->queuelist, &ctx->rq_list);
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}
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static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx,
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struct request *rq, bool at_head)
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void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
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bool at_head)
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{
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struct blk_mq_ctx *ctx = rq->mq_ctx;
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@ -1550,8 +1553,8 @@ run_queue:
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return cookie;
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}
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static void blk_mq_free_rq_map(struct blk_mq_tag_set *set,
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struct blk_mq_tags *tags, unsigned int hctx_idx)
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void blk_mq_free_rq_map(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
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unsigned int hctx_idx)
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{
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struct page *page;
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@ -1588,7 +1591,7 @@ static size_t order_to_size(unsigned int order)
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return (size_t)PAGE_SIZE << order;
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}
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static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
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struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
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unsigned int hctx_idx)
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{
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struct blk_mq_tags *tags;
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@ -2279,10 +2282,10 @@ static int blk_mq_queue_reinit_dead(unsigned int cpu)
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* Now CPU1 is just onlined and a request is inserted into ctx1->rq_list
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* and set bit0 in pending bitmap as ctx1->index_hw is still zero.
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*
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* And then while running hw queue, flush_busy_ctxs() finds bit0 is set in
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* pending bitmap and tries to retrieve requests in hctx->ctxs[0]->rq_list.
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* But htx->ctxs[0] is a pointer to ctx0, so the request in ctx1->rq_list
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* is ignored.
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* And then while running hw queue, blk_mq_flush_busy_ctxs() finds bit0 is set
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* in pending bitmap and tries to retrieve requests in hctx->ctxs[0]->rq_list.
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* But htx->ctxs[0] is a pointer to ctx0, so the request in ctx1->rq_list is
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* ignored.
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*/
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static int blk_mq_queue_reinit_prepare(unsigned int cpu)
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{
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@ -32,6 +32,21 @@ void blk_mq_free_queue(struct request_queue *q);
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int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
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void blk_mq_wake_waiters(struct request_queue *q);
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bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *, struct list_head *);
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void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
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/*
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* Internal helpers for allocating/freeing the request map
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*/
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void blk_mq_free_rq_map(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
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unsigned int hctx_idx);
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struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
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unsigned int hctx_idx);
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/*
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* Internal helpers for request insertion into sw queues
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*/
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void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
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bool at_head);
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/*
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* CPU hotplug helpers
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@ -103,6 +118,16 @@ static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
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data->hctx = hctx;
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}
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/*
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* Internal helpers for request allocation/init/free
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*/
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void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
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struct request *rq, unsigned int op);
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void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
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struct request *rq);
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struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,
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unsigned int op);
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static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
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{
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return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
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