[PATCH V3] drm/amdgpu: limit DMA size to PAGE_SIZE for scatter-gather buffers

Sinan Kaya okaya at codeaurora.org
Wed Apr 11 22:11:22 UTC 2018

Code is expecing to observe the same number of buffers returned from
dma_map_sg() function compared to sg_alloc_table_from_pages(). This
doesn't hold true universally especially for systems with IOMMU.

The hardware actually needs the dma_address on a page by page basis.
Joining multiple consecutive pages into one entry is just additional
overhead which we don't need.

Signed-off-by: Sinan Kaya <okaya at codeaurora.org>
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index af1b879..91abe1a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1948,6 +1948,9 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	/* init the mode config */
+	/* limit scatter-gather buffer size to PAGE_SIZE */
+	dma_set_max_seg_size(adev->dev, PAGE_SIZE);
 	r = amdgpu_device_ip_init(adev);
 	if (r) {
 		/* failed in exclusive mode due to timeout */

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