Commit 48262cd9 authored by Christian König's avatar Christian König
Browse files

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



Check if we can do peer2peer on the PCIe bus.

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Acked-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/359294
parent 57b7b62f

drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c

+4 −0
Original line number Diff line number Diff line
@@ -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;