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drm/amdgpu: Enable P2P dmabuf over XGMI

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Access the exported P2P dmabuf over XGMI, if available.
Otherwise, fall back to the existing PCIe method.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Arunpravin <apaneers@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Arunpravin
2020-08-06 14:34:33 +05:30
committed by Alex Deucher
parent d6e6dfb287
commit 0cf0ee983b
3 changed files with 52 additions and 3 deletions
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34
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
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@@ -35,6 +35,7 @@
#include "amdgpu_display.h"
#include "amdgpu_gem.h"
#include "amdgpu_dma_buf.h"
#include "amdgpu_xgmi.h"
#include <drm/amdgpu_drm.h>
#include <linux/dma-buf.h>
#include <linux/dma-fence-array.h>
@@ -595,3 +596,36 @@ struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
obj->import_attach = attach;
return obj;
}
/**
* amdgpu_dmabuf_is_xgmi_accessible - Check if xgmi available for P2P transfer
*
* @adev: amdgpu_device pointer of the importer
* @bo: amdgpu buffer object
*
* Returns:
* True if dmabuf accessible over xgmi, false otherwise.
*/
bool amdgpu_dmabuf_is_xgmi_accessible(struct amdgpu_device *adev,
struct amdgpu_bo *bo)
{
struct drm_gem_object *obj = &bo->tbo.base;
struct drm_gem_object *gobj;
if (obj->import_attach) {
struct dma_buf *dma_buf = obj->import_attach->dmabuf;
if (dma_buf->ops != &amdgpu_dmabuf_ops)
/* No XGMI with non AMD GPUs */
return false;
gobj = dma_buf->priv;
bo = gem_to_amdgpu_bo(gobj);
}
if (amdgpu_xgmi_same_hive(adev, amdgpu_ttm_adev(bo->tbo.bdev)) &&
(bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM))
return true;
return false;
}