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drm/amdgpu: add shadow bo support V2

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shadow bo is the shadow of a bo, which is always in GTT,
which can be used to backup the original bo.
V2:
reference shadow parent, shadow bo will be freed by who allocted him.

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Chunming Zhou 2016-07-26 14:13:21 +08:00 • committed by Alex Deucher
commit e7893c4bd3
3 changed files with 48 additions and 3 deletions
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2
include/uapi/drm/amdgpu_drm.h
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@ -79,6 +79,8 @@ extern "C" {
#define AMDGPU_GEM_CREATE_CPU_GTT_USWC (1 << 2)
/* Flag that the memory should be in VRAM and cleared */
#define AMDGPU_GEM_CREATE_VRAM_CLEARED (1 << 3)
/* Flag that create shadow bo(GTT) while allocating vram bo */
#define AMDGPU_GEM_CREATE_SHADOW (1 << 4)
struct drm_amdgpu_gem_create_in {
/** the requested memory size */