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nvme-pci: Introduce nvme_ring_cq_doorbell

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Nice abstraction of the actual mechanics of how to do it.
Note the change that we call it after we assign nvmeq->cq_head
to avoid passing it.

Signed-off-by: Sagi Grimberg <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Keith Busch <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Sagi Grimberg 2017-06-18 17:28:07 +03:00 • committed by Jens Axboe
commit eb281c8283
1 changed files with 13 additions and 4 deletions
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17
drivers/nvme/host/pci.c
View file

@ -730,6 +730,17 @@ static inline bool nvme_cqe_valid(struct nvme_queue *nvmeq, u16 head,
return (le16_to_cpu(nvmeq->cqes[head].status) & 1) == phase;
}
static inline void nvme_ring_cq_doorbell(struct nvme_queue *nvmeq)
{
u16 head = nvmeq->cq_head;
if (likely(nvmeq->cq_vector >= 0)) {
if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db,
nvmeq->dbbuf_cq_ei))
writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
}
}
static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag)
{
u16 head, phase;
@ -776,13 +787,11 @@ static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag)
if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
return;
if (likely(nvmeq->cq_vector >= 0))
if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db,
nvmeq->dbbuf_cq_ei))
writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
nvmeq->cq_head = head;
nvmeq->cq_phase = phase;
nvme_ring_cq_doorbell(nvmeq);
nvmeq->cqe_seen = 1;
}