[PATCH 2/2] drm/amdgpu: Add helper function to get sdma index

[Cui]

serie is Reviewed-by: Flora Cui <flora.cui at amd.com>

在 11/1/2018 1:57 PM, Rex Zhu 写道:
> Get the sdma index from ring
>
> v2: refine function name
>
> Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c | 16 ++++++++++++++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h |  1 +
>   2 files changed, 17 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> index c912230..115bb0c 100644
> --- 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
> index 664f549..16b1a6a 100644
> --- 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