[PATCH 7/8] drm/amdgpu: add amdgpu_gem_attach

Christian König
2018-03-25T11:00:24Z

Check if we can do peer2peer on the PCIe bus.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
index 2566268806c3..133596df0775 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
@@ -134,6 +134,29 @@ amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
return obj;
}

+static int amdgpu_gem_attach(struct dma_buf *dma_buf, struct device *dev,
+ struct dma_buf_attachment *attach)
+{
+ struct drm_gem_object *obj = dma_buf->priv;
+ struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
+ struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+
+ if (!attach->peer2peer)
+ return 0;
+
+ if (!dev_is_pci(dev))
+ goto no_peer2peer;
+
+ if (!pci_peer_traffic_supported(adev->pdev, to_pci_dev(dev)))
+ goto no_peer2peer;
+
+ return 0;
+
+no_peer2peer:
+ attach->peer2peer = false;
+ return 0;
+}
+
static struct sg_table *
amdgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
@@ -274,6 +297,7 @@ static int amdgpu_gem_begin_cpu_access(struct dma_buf *dma_buf,
}

static const struct dma_buf_ops amdgpu_dmabuf_ops = {
+ .attach = amdgpu_gem_attach,
.map_dma_buf = amdgpu_gem_map_dma_buf,
.unmap_dma_buf = amdgpu_gem_unmap_dma_buf,
.release = drm_gem_dmabuf_release,
--
2.14.1