drm/amdgpu: Add helper function to get sdma index

Get the sdma index from ring v2: refine function name Reviewed-by: Alex Deucher <[email protected]> Reviewed-by: Flora Cui <[email protected]> Signed-off-by: Rex Zhu <[email protected]> Signed-off-by: Alex Deucher <[email protected]>
raspberrypi · Nov 5, 2018 · f6cffc0 · f6cffc0
1 parent ccf191f
commit f6cffc0
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diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
@@ -40,3 +40,19 @@ struct amdgpu_sdma_instance *amdgpu_sdma_get_instance_from_ring(struct amdgpu_ri
 
 	return NULL;
 }
+
+int amdgpu_sdma_get_index_from_ring(struct amdgpu_ring *ring, uint32_t *index)
+{
+	struct amdgpu_device *adev = ring->adev;
+	int i;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		if (ring == &adev->sdma.instance[i].ring ||
+			ring == &adev->sdma.instance[i].page) {
+			*index = i;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h
@@ -95,5 +95,6 @@ struct amdgpu_buffer_funcs {
 
 struct amdgpu_sdma_instance *
 amdgpu_sdma_get_instance_from_ring(struct amdgpu_ring *ring);
+int amdgpu_sdma_get_index_from_ring(struct amdgpu_ring *ring, uint32_t *index);
 
 #endif