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drm/amdgpu: add checks if DMA-buf P2P is supported

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Check if we can do peer2peer on the PCIe bus.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/359294
This commit is contained in:
Christian König 2018-03-23 16:33:57 +01:00
parent 57b7b62f5a
commit 48262cd949
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
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@ -38,6 +38,7 @@
#include <drm/amdgpu_drm.h>
#include <linux/dma-buf.h>
#include <linux/dma-fence-array.h>
#include <linux/pci-p2pdma.h>
/**
* amdgpu_gem_prime_vmap - &dma_buf_ops.vmap implementation
@ -179,6 +180,9 @@ static int amdgpu_dma_buf_attach(struct dma_buf *dmabuf,
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
int r;
if (pci_p2pdma_distance_many(adev->pdev, &attach->dev, 1, true) < 0)
attach->peer2peer = false;
if (attach->dev->driver == adev->dev->driver)
return 0;