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blk-mq: factor out a blk_mq_complete_need_ipi helper 

Add a helper to decide if we can complete locally or need an IPI.

Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-06-11 08:44:49 +02:00 committed by Jens Axboe
parent 4c8fc19686
commit 963395269c
1 changed files with 21 additions and 18 deletions
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39
block/blk-mq.c
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@ -654,6 +654,24 @@ static void __blk_mq_complete_request_remote(void *data)
__blk_mq_complete_request(data);
}
static inline bool blk_mq_complete_need_ipi(struct request *rq)
{
int cpu = raw_smp_processor_id();
if (!IS_ENABLED(CONFIG_SMP) ||
!test_bit(QUEUE_FLAG_SAME_COMP, &rq->q->queue_flags))
return false;
/* same CPU or cache domain? Complete locally */
if (cpu == rq->mq_ctx->cpu ||
(!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags) &&
cpus_share_cache(cpu, rq->mq_ctx->cpu)))
return false;
/* don't try to IPI to an offline CPU */
return cpu_online(rq->mq_ctx->cpu);
}
/**
* blk_mq_complete_request - end I/O on a request
* @rq: the request being processed
@ -663,11 +681,6 @@ static void __blk_mq_complete_request_remote(void *data)
**/
void blk_mq_complete_request(struct request *rq)
{
struct blk_mq_ctx *ctx = rq->mq_ctx;
struct request_queue *q = rq->q;
bool shared = false;
int cpu;
WRITE_ONCE(rq->state, MQ_RQ_COMPLETE);
/*
@ -675,25 +688,15 @@ void blk_mq_complete_request(struct request *rq)
* to redirect the completion.
*/
if (rq->cmd_flags & REQ_HIPRI) {
q->mq_ops->complete(rq);
rq->q->mq_ops->complete(rq);
return;
}
if (!IS_ENABLED(CONFIG_SMP) ||
!test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags)) {
__blk_mq_complete_request(rq);
return;
}
cpu = raw_smp_processor_id();
if (!test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags))
shared = cpus_share_cache(cpu, ctx->cpu);
if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) {
if (blk_mq_complete_need_ipi(rq)) {
rq->csd.func = __blk_mq_complete_request_remote;
rq->csd.info = rq;
rq->csd.flags = 0;
smp_call_function_single_async(ctx->cpu, &rq->csd);
smp_call_function_single_async(rq->mq_ctx->cpu, &rq->csd);
} else {
__blk_mq_complete_request(rq);
}