#include "blk-mq-tag.h"
#include "blk-wbt.h"
-void blk_mq_sched_free_hctx_data(struct request_queue *q,
- void (*exit)(struct blk_mq_hw_ctx *))
-{
- struct blk_mq_hw_ctx *hctx;
- int i;
-
- queue_for_each_hw_ctx(q, hctx, i) {
- if (exit && hctx->sched_data)
- exit(hctx);
- kfree(hctx->sched_data);
- hctx->sched_data = NULL;
- }
-}
-EXPORT_SYMBOL_GPL(blk_mq_sched_free_hctx_data);
-
void blk_mq_sched_assign_ioc(struct request *rq)
{
struct request_queue *q = rq->q;
}
}
-bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,
- unsigned int nr_segs, struct request **merged_request)
-{
- struct request *rq;
-
- switch (elv_merge(q, &rq, bio)) {
- case ELEVATOR_BACK_MERGE:
- if (!blk_mq_sched_allow_merge(q, rq, bio))
- return false;
- if (!bio_attempt_back_merge(rq, bio, nr_segs))
- return false;
- *merged_request = attempt_back_merge(q, rq);
- if (!*merged_request)
- elv_merged_request(q, rq, ELEVATOR_BACK_MERGE);
- return true;
- case ELEVATOR_FRONT_MERGE:
- if (!blk_mq_sched_allow_merge(q, rq, bio))
- return false;
- if (!bio_attempt_front_merge(rq, bio, nr_segs))
- return false;
- *merged_request = attempt_front_merge(q, rq);
- if (!*merged_request)
- elv_merged_request(q, rq, ELEVATOR_FRONT_MERGE);
- return true;
- case ELEVATOR_DISCARD_MERGE:
- return bio_attempt_discard_merge(q, rq, bio);
- default:
- return false;
- }
-}
-EXPORT_SYMBOL_GPL(blk_mq_sched_try_merge);
-
-/*
- * Iterate list of requests and see if we can merge this bio with any
- * of them.
- */
-bool blk_mq_bio_list_merge(struct request_queue *q, struct list_head *list,
- struct bio *bio, unsigned int nr_segs)
-{
- struct request *rq;
- int checked = 8;
-
- list_for_each_entry_reverse(rq, list, queuelist) {
- bool merged = false;
-
- if (!checked--)
- break;
-
- if (!blk_rq_merge_ok(rq, bio))
- continue;
-
- switch (blk_try_merge(rq, bio)) {
- case ELEVATOR_BACK_MERGE:
- if (blk_mq_sched_allow_merge(q, rq, bio))
- merged = bio_attempt_back_merge(rq, bio,
- nr_segs);
- break;
- case ELEVATOR_FRONT_MERGE:
- if (blk_mq_sched_allow_merge(q, rq, bio))
- merged = bio_attempt_front_merge(rq, bio,
- nr_segs);
- break;
- case ELEVATOR_DISCARD_MERGE:
- merged = bio_attempt_discard_merge(q, rq, bio);
- break;
- default:
- continue;
- }
-
- return merged;
- }
-
- return false;
-}
-EXPORT_SYMBOL_GPL(blk_mq_bio_list_merge);
-
-/*
- * Reverse check our software queue for entries that we could potentially
- * merge with. Currently includes a hand-wavy stop count of 8, to not spend
- * too much time checking for merges.
- */
-static bool blk_mq_attempt_merge(struct request_queue *q,
- struct blk_mq_hw_ctx *hctx,
- struct blk_mq_ctx *ctx, struct bio *bio,
- unsigned int nr_segs)
-{
- enum hctx_type type = hctx->type;
-
- lockdep_assert_held(&ctx->lock);
-
- if (blk_mq_bio_list_merge(q, &ctx->rq_lists[type], bio, nr_segs)) {
- ctx->rq_merged++;
- return true;
- }
-
- return false;
-}
-
bool __blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio,
unsigned int nr_segs)
{
return e->type->ops.bio_merge(hctx, bio, nr_segs);
type = hctx->type;
- if ((hctx->flags & BLK_MQ_F_SHOULD_MERGE) &&
- !list_empty_careful(&ctx->rq_lists[type])) {
- /* default per sw-queue merge */
- spin_lock(&ctx->lock);
- ret = blk_mq_attempt_merge(q, hctx, ctx, bio, nr_segs);
- spin_unlock(&ctx->lock);
+ if (!(hctx->flags & BLK_MQ_F_SHOULD_MERGE) ||
+ list_empty_careful(&ctx->rq_lists[type]))
+ return false;
+
+ /* default per sw-queue merge */
+ spin_lock(&ctx->lock);
+ /*
+ * Reverse check our software queue for entries that we could
+ * potentially merge with. Currently includes a hand-wavy stop
+ * count of 8, to not spend too much time checking for merges.
+ */
+ if (blk_bio_list_merge(q, &ctx->rq_lists[type], bio, nr_segs)) {
+ ctx->rq_merged++;
+ ret = true;
}
+ spin_unlock(&ctx->lock);
+
return ret;
}
struct blk_mq_ctx *ctx = rq->mq_ctx;
struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
- /* flush rq in flush machinery need to be dispatched directly */
- if (!(rq->rq_flags & RQF_FLUSH_SEQ) && op_is_flush(rq->cmd_flags)) {
- blk_insert_flush(rq);
- goto run;
- }
-
- WARN_ON(e && (rq->tag != -1));
+ WARN_ON(e && (rq->tag != BLK_MQ_NO_TAG));
if (blk_mq_sched_bypass_insert(hctx, !!e, rq)) {
/*
struct blk_mq_hw_ctx *hctx,
unsigned int hctx_idx)
{
+ unsigned int flags = set->flags & ~BLK_MQ_F_TAG_HCTX_SHARED;
+
if (hctx->sched_tags) {
blk_mq_free_rqs(set, hctx->sched_tags, hctx_idx);
- blk_mq_free_rq_map(hctx->sched_tags);
+ blk_mq_free_rq_map(hctx->sched_tags, flags);
hctx->sched_tags = NULL;
}
}
unsigned int hctx_idx)
{
struct blk_mq_tag_set *set = q->tag_set;
+ /* Clear HCTX_SHARED so tags are init'ed */
+ unsigned int flags = set->flags & ~BLK_MQ_F_TAG_HCTX_SHARED;
int ret;
hctx->sched_tags = blk_mq_alloc_rq_map(set, hctx_idx, q->nr_requests,
- set->reserved_tags);
+ set->reserved_tags, flags);
if (!hctx->sched_tags)
return -ENOMEM;
int i;
queue_for_each_hw_ctx(q, hctx, i) {
+ /* Clear HCTX_SHARED so tags are freed */
+ unsigned int flags = hctx->flags & ~BLK_MQ_F_TAG_HCTX_SHARED;
+
if (hctx->sched_tags) {
- blk_mq_free_rq_map(hctx->sched_tags);
+ blk_mq_free_rq_map(hctx->sched_tags, flags);
hctx->sched_tags = NULL;
}
}
projects / linux-2.6-microblaze.git / blobdiff