shadow bo is the shadow of a bo, which is always in GTT,
which can be used to backup the original bo.
Change-Id: Ia27d4225c47ff41d3053eb691276e29fb2d64026
Signed-off-by: Chunming Zhou <david1.z...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 36 +++++++++++++++++++++++++++---
include/uapi/drm/amdgpu_drm.h | 2 ++
3 files changed, 36 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index b7d9e66..7b4a0cf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -500,6 +500,7 @@ struct amdgpu_bo {
struct amdgpu_device *adev;
struct drm_gem_object gem_base;
struct amdgpu_bo *parent;
+ struct amdgpu_bo *shadow;
struct ttm_bo_kmap_obj dma_buf_vmap;
struct amdgpu_mn *mn;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 67de19c..6e59b4e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -356,6 +356,7 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
{
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));
@@ -363,9 +364,32 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
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) {
+ 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, kernel,
+ AMDGPU_GEM_DOMAIN_GTT,
+ AMDGPU_GEM_CREATE_CPU_GTT_USWC,
+ NULL, &placement,
+ (*bo_ptr)->tbo.resv,
+ &(*bo_ptr)->shadow);
+ if (r)
+ amdgpu_bo_unref(bo_ptr);
+ } else
+ (*bo_ptr)->shadow = NULL;
+
+ return 0;
}
int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
@@ -422,6 +446,12 @@ void amdgpu_bo_unref(struct amdgpu_bo **bo)
if ((*bo) == NULL)
return;
+ if ((*bo)->flags & AMDGPU_GEM_CREATE_SHADOW) {
+ tbo = &((*bo)->shadow->tbo);
+ ttm_bo_unref(&tbo);
+ if (tbo == NULL)
+ (*bo)->shadow = NULL;
+ }
tbo = &((*bo)->tbo);
ttm_bo_unref(&tbo);
diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 946f238..2d756d9 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -75,6 +75,8 @@
#define AMDGPU_GEM_CREATE_NO_CPU_ACCESS (1 << 1)
/* Flag that USWC attributes should be used for GTT */
#define AMDGPU_GEM_CREATE_CPU_GTT_USWC (1 << 2)
+/* Flag that create shadow bo(GTT) while allocating vram bo */
+#define AMDGPU_GEM_CREATE_SHADOW (1 << 3)
struct drm_amdgpu_gem_create_in {
/** the requested memory size */
--
1.9.1
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