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blk-mq: factor out a helper to reise the block softirq 

Add a helper to deduplicate the logic that raises the block softirq.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-06-11 08:44:42 +02:00 committed by Jens Axboe
parent c3077b5d97
commit 115243f553
1 changed files with 17 additions and 20 deletions
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37
block/blk-mq.c
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@ -598,17 +598,25 @@ static __latent_entropy void blk_done_softirq(struct softirq_action *h)
}
}
static void blk_mq_trigger_softirq(struct request *rq)
{
struct list_head *list = this_cpu_ptr(&blk_cpu_done);
list_add_tail(&rq->ipi_list, list);
/*
* If the list only contains our just added request, signal a raise of
* the softirq. If there are already entries there, someone already
* raised the irq but it hasn't run yet.
*/
if (list->next == &rq->ipi_list)
raise_softirq_irqoff(BLOCK_SOFTIRQ);
}
#ifdef CONFIG_SMP
static void trigger_softirq(void *data)
{
struct request *rq = data;
struct list_head *list;
list = this_cpu_ptr(&blk_cpu_done);
list_add_tail(&rq->ipi_list, list);
if (list->next == &rq->ipi_list)
raise_softirq_irqoff(BLOCK_SOFTIRQ);
blk_mq_trigger_softirq(data);
}
/*
@ -681,19 +689,8 @@ static void __blk_complete_request(struct request *req)
* avoids IPI sending from current CPU to the first CPU of a group.
*/
if (ccpu == cpu || shared) {
struct list_head *list;
do_local:
list = this_cpu_ptr(&blk_cpu_done);
list_add_tail(&req->ipi_list, list);
/*
* if the list only contains our just added request,
* signal a raise of the softirq. If there are already
* entries there, someone already raised the irq but it
* hasn't run yet.
*/
if (list->next == &req->ipi_list)
raise_softirq_irqoff(BLOCK_SOFTIRQ);
blk_mq_trigger_softirq(req);
} else if (raise_blk_irq(ccpu, req))
goto do_local;