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nvme: set dma alignment to dword 

The nvme specification only requires qword alignment for segment
descriptors, and the driver already guarantees that. The spec has always
allowed user data to be dword aligned, which is what the queue's
attribute is for, so relax the alignment requirement to that value.

While we could allow byte alignment for some controllers when using
SGLs, we still need to support PRP, and that only allows dword.

Fixes: 3b2a1ebceb ("nvme: set dma alignment to qword")
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Keith Busch 2022-05-04 11:43:25 -07:00 committed by Christoph Hellwig
parent 1a86924e4f
commit 52fde2c07d
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/host/core.c
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@ -1773,7 +1773,7 @@ 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, NVME_CTRL_PAGE_SIZE - 1);
blk_queue_dma_alignment(q, 7);
blk_queue_dma_alignment(q, 3);
blk_queue_write_cache(q, vwc, vwc);
}