[PATCH v2 2/2] drm/amdgpu: expose AMDGPU_GEM_CREATE_VRAM_CLEARED to user space

[Flora Cui]

V2: fix the return value for fill failure and validate bo before
filling data

Change-Id: I256178afa18c1a433fe60d8656d1c5cc5d55cf2f
Signed-off-by: Flora Cui <flora....@amd.com>
Reviewed-by: Chunming Zhou <david1.z...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 33 ++++++++++++++++++++++++++++++
 include/uapi/drm/amdgpu_drm.h              |  2 ++
 2 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 6f0873c..59f3a75 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -277,11 +277,44 @@ int amdgpu_bo_create_restricted(struct amdgpu_device 
*adev,
        if (unlikely(r != 0)) {
                return r;
        }
+
+       if (flags & AMDGPU_GEM_CREATE_VRAM_CLEARED &&
+           bo->tbo.mem.placement & TTM_PL_FLAG_VRAM) {
+               struct fence *fence;
+
+               if (adev->mman.buffer_funcs_ring == NULL ||
+                  !adev->mman.buffer_funcs_ring->ready) {
+                       r = -EBUSY;
+                       goto fail_free;
+               }
+
+               r = amdgpu_bo_reserve(bo, false);
+               if (unlikely(r != 0))
+                       goto fail_free;
+
+               amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_VRAM);
+               r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
+               if (unlikely(r != 0))
+                       goto fail_unreserve;
+
+               amdgpu_fill_buffer(bo, 0, bo->tbo.resv, &fence);
+               amdgpu_bo_fence(bo, fence, false);
+               amdgpu_bo_unreserve(bo);
+               fence_put(bo->tbo.moving);
+               bo->tbo.moving = fence_get(fence);
+               fence_put(fence);
+       }
        *bo_ptr = bo;
 
        trace_amdgpu_bo_create(bo);
 
        return 0;
+
+fail_unreserve:
+       amdgpu_bo_unreserve(bo);
+fail_free:
+       amdgpu_bo_unref(&bo);
+       return r;
 }
 
 int amdgpu_bo_create(struct amdgpu_device *adev,
diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 946f238..8df3816 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 the memory should be in VRAM and cleared */
+#define AMDGPU_GEM_CREATE_VRAM_CLEARED         (1 << 3)
 
 struct drm_amdgpu_gem_create_in  {
        /** the requested memory size */
-- 
1.9.1

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