drm/amdgpu: add a new helper to free a BO in kernel allocations

Free the BO allocated by amdgpu_bo_create_kernel()

Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 31 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index b17734e0ecc8..162411bd8145 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -287,6 +287,35 @@ error_free:
         return r;
 }
 
+/**
+ * amdgpu_bo_free_kernel - free BO for kernel use
+ *
+ * @bo: amdgpu BO to free
+ *
+ * unmaps and unpin a BO for kernel internal use.
+ */
+void amdgpu_bo_free_kernel(struct amdgpu_bo **bo, u64 *gpu_addr,
+                           void **cpu_addr)
+{
+        if (*bo == NULL)
+                return;
+
+        if (likely(amdgpu_bo_reserve(*bo, false) == 0)) {
+                if (cpu_addr)
+                        amdgpu_bo_kunmap(*bo);
+
+                amdgpu_bo_unpin(*bo);
+                amdgpu_bo_unreserve(*bo);
+        }
+        amdgpu_bo_unref(bo);
+
+        if (gpu_addr)
+                *gpu_addr = 0;
+
+        if (cpu_addr)
+                *cpu_addr = NULL;
+}
+
 int amdgpu_bo_create_restricted(struct amdgpu_device *adev,
                                 unsigned long size, int byte_align,
                                 bool kernel, u32 domain, u64 flags,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index b6a27390ef88..3032c541ef0e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -128,6 +128,8 @@ int amdgpu_bo_create_kernel(struct amdgpu_device *adev,
                             unsigned long size, int align,
                             u32 domain, struct amdgpu_bo **bo_ptr,
                             u64 *gpu_addr, void **cpu_addr);
+void amdgpu_bo_free_kernel(struct amdgpu_bo **bo, u64 *gpu_addr,
+                           void **cpu_addr);
 int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr);
 void amdgpu_bo_kunmap(struct amdgpu_bo *bo);
 struct amdgpu_bo *amdgpu_bo_ref(struct amdgpu_bo *bo);