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authorKeith Busch2020-05-20 19:22:53 -0700
committerChristoph Hellwig2020-05-27 07:12:40 +0200
commit3b2a1ebceba3e03b17ef0970bb7757a3a64cdc8b (patch)
tree9e63c3314af9b9cbc2e0128c171de8b933c60569 /drivers/nvme
parent1cdf9f7670a7d74e27177d5c390c2f8b3b9ba338 (diff)
nvme: set dma alignment to qword
The default dma alignment mask is 511, which is much larger than any nvme controller requires. NVMe controllers accept qword aligned DMA addresses, so set the request_queue constraints to that. This can help avoid bounce buffers on user passthrough commands. Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/core.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index a3a4dbc59af1..569671e264b5 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2322,6 +2322,7 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
}
blk_queue_virt_boundary(q, ctrl->page_size - 1);
+ blk_queue_dma_alignment(q, 7);
if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
vwc = true;
blk_queue_write_cache(q, vwc, vwc);