[PATCH 1/3] drm/amdgpu/sdma: add begin_use/end_use helpers

[Mario Limonciello]

On 12/8/2023 16:19, Alex Deucher wrote:
> Add helper functions to disallow GFXOFF while SDMA has work.
> This should avoid corner cases where GFXOFF is erroneously
> entered when SDMA is still active.  For now just allow/disallow
> GFXOFF in the begin and end helpers until we root cause the
> issue.  This should not impact power as SDMA usage is pretty
> minimal and GFXOSS should not be active when SDMA is active
> anyway, this just makes it explicit.
> 
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---

For the series:

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2220
Reviewed-by: Mario Limonciello <mario.limonciello at amd.com>
Tested-by: Mario Limonciello <mario.limonciello at amd.com>

>   drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c | 14 ++++++++++++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h |  3 +++
>   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 1d9d187de6ee..d4b08d03970c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> @@ -326,3 +326,17 @@ int amdgpu_sdma_ras_sw_init(struct amdgpu_device *adev)
>   
>   	return 0;
>   }
> +
> +void amdgpu_sdma_ring_begin_use(struct amdgpu_ring *ring)
> +{
> +	struct amdgpu_device *adev = ring->adev;
> +
> +	amdgpu_gfx_off_ctrl(adev, false);
> +}
> +
> +void amdgpu_sdma_ring_end_use(struct amdgpu_ring *ring)
> +{
> +	struct amdgpu_device *adev = ring->adev;
> +
> +	amdgpu_gfx_off_ctrl(adev, true);
> +}
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h
> index 173a2a308078..b52d16829204 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.h
> @@ -171,4 +171,7 @@ void amdgpu_sdma_destroy_inst_ctx(struct amdgpu_device *adev,
>           bool duplicate);
>   int amdgpu_sdma_ras_sw_init(struct amdgpu_device *adev);
>   
> +void amdgpu_sdma_ring_begin_use(struct amdgpu_ring *ring);
> +void amdgpu_sdma_ring_end_use(struct amdgpu_ring *ring);
> +
>   #endif