diff options
| author | Sagi Grimberg <sagi@grimberg.me> | 2017-06-18 17:28:07 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-06-28 08:14:13 -0600 |
| commit | eb281c8283e87a2d1d6ed406f9c6408c39737b4d (patch) | |
| tree | 8ea5a64f3d26ec63a20157b141854b0a16e9bbd6 /drivers/nvme | |
| parent | 5657cb0797c4ab303f5782442095319bd971257b (diff) | |
| download | linux-rt-eb281c8283e87a2d1d6ed406f9c6408c39737b4d.tar.gz | |
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>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/pci.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 0f09a2d5cf7a..042cfe5ef8e9 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -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; } |