drm/amdgpu: add shadow bo support V2
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>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index d8e69a7..278017d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -380,6 +380,37 @@
return r;
}
+static int amdgpu_bo_create_shadow(struct amdgpu_device *adev,
+ unsigned long size, int byte_align,
+ struct amdgpu_bo *bo)
+{
+ struct ttm_placement placement = {0};
+ struct ttm_place placements[AMDGPU_GEM_DOMAIN_MAX + 1];
+ int r;
+
+ if (bo->shadow)
+ return 0;
+
+ bo->flags |= AMDGPU_GEM_CREATE_SHADOW;
+ memset(&placements, 0,
+ (AMDGPU_GEM_DOMAIN_MAX + 1) * sizeof(struct ttm_place));
+
+ amdgpu_ttm_placement_init(adev, &placement,
+ placements, AMDGPU_GEM_DOMAIN_GTT,
+ AMDGPU_GEM_CREATE_CPU_GTT_USWC);
+
+ r = amdgpu_bo_create_restricted(adev, size, byte_align, true,
+ AMDGPU_GEM_DOMAIN_GTT,
+ AMDGPU_GEM_CREATE_CPU_GTT_USWC,
+ NULL, &placement,
+ bo->tbo.resv,
+ &bo->shadow);
+ if (!r)
+ bo->shadow->parent = amdgpu_bo_ref(bo);
+
+ return r;
+}
+
int amdgpu_bo_create(struct amdgpu_device *adev,
unsigned long size, int byte_align,
bool kernel, u32 domain, u64 flags,
@@ -389,6 +420,7 @@
{
struct ttm_placement placement = {0};
struct ttm_place placements[AMDGPU_GEM_DOMAIN_MAX + 1];
+ int r;
memset(&placements, 0,
(AMDGPU_GEM_DOMAIN_MAX + 1) * sizeof(struct ttm_place));
@@ -396,9 +428,19 @@
amdgpu_ttm_placement_init(adev, &placement,
placements, domain, flags);
- return amdgpu_bo_create_restricted(adev, size, byte_align, kernel,
- domain, flags, sg, &placement,
- resv, bo_ptr);
+ r = amdgpu_bo_create_restricted(adev, size, byte_align, kernel,
+ domain, flags, sg, &placement,
+ resv, bo_ptr);
+ if (r)
+ return r;
+
+ if (flags & AMDGPU_GEM_CREATE_SHADOW) {
+ r = amdgpu_bo_create_shadow(adev, size, byte_align, (*bo_ptr));
+ if (r)
+ amdgpu_bo_unref(bo_ptr);
+ }
+
+ return r;
}
int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)