forked from luck/tmp_suning_uos_patched
nvme-pci: Introduce nvme_ring_cq_doorbell
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 <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -730,6 +730,17 @@ static inline bool nvme_cqe_valid(struct nvme_queue *nvmeq, u16 head,
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return (le16_to_cpu(nvmeq->cqes[head].status) & 1) == phase;
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}
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static inline void nvme_ring_cq_doorbell(struct nvme_queue *nvmeq)
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{
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u16 head = nvmeq->cq_head;
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if (likely(nvmeq->cq_vector >= 0)) {
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if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db,
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nvmeq->dbbuf_cq_ei))
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writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
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}
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}
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static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag)
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{
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u16 head, phase;
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@ -776,13 +787,11 @@ static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag)
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if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
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return;
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if (likely(nvmeq->cq_vector >= 0))
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if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db,
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nvmeq->dbbuf_cq_ei))
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writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
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nvmeq->cq_head = head;
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nvmeq->cq_phase = phase;
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nvme_ring_cq_doorbell(nvmeq);
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nvmeq->cqe_seen = 1;
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}
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