提交 52fde2c0 编写于 作者: K Keith Busch 提交者: Christoph Hellwig

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: 3b2a1ebc ("nvme: set dma alignment to qword")
Signed-off-by: NKeith Busch <kbusch@kernel.org>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
上级 1a86924e
......@@ -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);
}
......
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