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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>
This commit is contained in:
Jens Axboe 2016-12-14 14:34:47 -07:00
parent 16a3c2a70c
commit 2c3ad66790
2 changed files with 46 additions and 18 deletions
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39
block/blk-mq.c
View File

@ -167,8 +167,8 @@ 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,
struct request *rq, unsigned int op)
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);
/* csd/requeue_work/fifo_time is initialized before use */
@ -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;
@ -1588,8 +1591,8 @@ 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,
unsigned int hctx_idx)
struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
unsigned int hctx_idx)
{
struct blk_mq_tags *tags;
unsigned int i, j, entries_per_page, max_order = 4;
@ -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)
{

25
block/blk-mq.h
View File

@ -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);