drm/amdgpu/VCN: add buffer for indirect SRAM usage

This will be used later for indirect SRAM mode
Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: James Zhu <James.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c

@@ -137,6 +137,16 @@ int amdgpu_vcn_sw_init(struct amdgpu_device *adev)
 		return r;
 	}
 
+	if (adev->vcn.indirect_sram) {
+		r = amdgpu_bo_create_kernel(adev, 64 * 2 * 4, PAGE_SIZE,
+			    AMDGPU_GEM_DOMAIN_VRAM, &adev->vcn.dpg_sram_bo,
+			    &adev->vcn.dpg_sram_gpu_addr, &adev->vcn.dpg_sram_cpu_addr);
+		if (r) {
+			dev_err(adev->dev, "(%d) failed to allocate DPG bo\n", r);
+			return r;
+		}
+	}
+
 	return 0;
 }
 
@@ -146,6 +156,12 @@ int amdgpu_vcn_sw_fini(struct amdgpu_device *adev)
 
 	kvfree(adev->vcn.saved_bo);
 
+	if (adev->vcn.indirect_sram) {
+		amdgpu_bo_free_kernel(&adev->vcn.dpg_sram_bo,
+			      &adev->vcn.dpg_sram_gpu_addr,
+			      (void **)&adev->vcn.dpg_sram_cpu_addr);
+	}
+
 	amdgpu_bo_free_kernel(&adev->vcn.vcpu_bo,
 			      &adev->vcn.gpu_addr,
 			      (void **)&adev->vcn.cpu_addr);

drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h

@@ -164,6 +164,12 @@ struct amdgpu_vcn {
 	struct amdgpu_vcn_reg	internal, external;
 	int (*pause_dpg_mode)(struct amdgpu_device *adev,
 		struct dpg_pause_state *new_state);
+
+	bool			indirect_sram;
+	struct amdgpu_bo	*dpg_sram_bo;
+	void			*dpg_sram_cpu_addr;
+	uint64_t		dpg_sram_gpu_addr;
+	uint32_t		*dpg_sram_curr_addr;
 };
 
 int amdgpu_vcn_sw_init(struct amdgpu_device *adev);