linux-kernel - [PATCH 5.11 21/31] nvme-pci: set min_align

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Date:   Wed,  5 May 2021 14:06:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jianxiong Gao <jxgao@...gle.com>,
        Christoph Hellwig <hch@....de>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 5.11 21/31] nvme-pci: set min_align_mask

From: Jianxiong Gao <jxgao@...gle.com>

commit: 3d2d861eb03e8ee96dc430a54361c900cbe28afd

The PRP addressing scheme requires all PRP entries except for the
first one to have a zero offset into the NVMe controller pages (which
can be different from the Linux PAGE_SIZE).  Use the min_align_mask
device parameter to ensure that swiotlb does not change the address
of the buffer modulo the device page size to ensure that the PRPs
won't be malformed.

Signed-off-by: Jianxiong Gao <jxgao@...gle.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Tested-by: Jianxiong Gao <jxgao@...gle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nvme/host/pci.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2629,6 +2629,7 @@ static void nvme_reset_work(struct work_
 	 * Don't limit the IOMMU merged segment size.
 	 */
 	dma_set_max_seg_size(dev->dev, 0xffffffff);
+	dma_set_min_align_mask(dev->dev, NVME_CTRL_PAGE_SIZE - 1);
 
 	mutex_unlock(&dev->shutdown_lock);