[PATCH 3/6] drm/admgpu: add two shadow BO helper functions

[Nirmoy Das]

Add amdgpu_bo_add_to_shadow_list() to handle shadow list
additions and amdgpu_bo_shadowed() to check if a BO is shadowed.

Signed-off-by: Nirmoy Das <nirmoy....@amd.com>
Reviewed-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 16 ++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 17 +++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 2e5426ab24a8..89ba612a5080 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -760,6 +760,22 @@ int amdgpu_bo_validate(struct amdgpu_bo *bo)
        return r;
 }
 
+/**
+ * amdgpu_bo_add_to_shadow_list - add a BO to the shadow list
+ *
+ * @bo: BO that will be inserted into the shadow list
+ *
+ * Insert a BO to the shadow list.
+ */
+void amdgpu_bo_add_to_shadow_list(struct amdgpu_bo *bo)
+{
+       struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+
+       mutex_lock(&adev->shadow_list_lock);
+       list_add_tail(&bo->shadow_list, &adev->shadow_list);
+       mutex_unlock(&adev->shadow_list_lock);
+}
+
 /**
  * amdgpu_bo_restore_shadow - restore an &amdgpu_bo shadow
  *
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index a7fbf5f7051e..9afccf6c66f2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -259,6 +259,22 @@ static inline bool amdgpu_bo_encrypted(struct amdgpu_bo 
*bo)
        return bo->flags & AMDGPU_GEM_CREATE_ENCRYPTED;
 }
 
+/**
+ * amdgpu_bo_shadowed - check if the BO is shadowed
+ *
+ * @bo: BO to be tested.
+ *
+ * Returns:
+ * NULL if not shadowed or else return a BO pointer.
+ */
+static inline struct amdgpu_bo *amdgpu_bo_shadowed(struct amdgpu_bo *bo)
+{
+       if (bo->tbo.type == ttm_bo_type_kernel)
+               return to_amdgpu_bo_vm(bo)->shadow;
+
+       return NULL;
+}
+
 bool amdgpu_bo_is_amdgpu_bo(struct ttm_buffer_object *bo);
 void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain);
 
@@ -322,6 +338,7 @@ u64 amdgpu_bo_gpu_offset_no_check(struct amdgpu_bo *bo);
 int amdgpu_bo_validate(struct amdgpu_bo *bo);
 void amdgpu_bo_get_memory(struct amdgpu_bo *bo, uint64_t *vram_mem,
                                uint64_t *gtt_mem, uint64_t *cpu_mem);
+void amdgpu_bo_add_to_shadow_list(struct amdgpu_bo *bo);
 int amdgpu_bo_restore_shadow(struct amdgpu_bo *shadow,
                             struct dma_fence **fence);
 uint32_t amdgpu_bo_get_preferred_pin_domain(struct amdgpu_device *adev,
-- 
2.31.1

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