[PATCH v3 2/5] drm/amdgpu: move GTT to shmem after eviction for hibernation

[Christian König]

On 08.07.25 09:42, Samuel Zhang wrote:
> When hibernate with data center dGPUs, huge number of VRAM BOs evicted
> to GTT and takes too much system memory. This will cause hibernation
> fail due to insufficient memory for creating the hibernation image.
> 
> Move GTT BOs to shmem in KMD, then shmem to swap disk in kernel
> hibernation code to make room for hibernation image.
> 
> Signed-off-by: Samuel Zhang <guoqing.zhang at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 684d66bc0b5f..2f977fece08f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -5021,8 +5021,16 @@ static int amdgpu_device_evict_resources(struct amdgpu_device *adev)
>  		return 0;
>  
>  	ret = amdgpu_ttm_evict_resources(adev, TTM_PL_VRAM);
> -	if (ret)
> +	if (ret) {
>  		dev_warn(adev->dev, "evicting device resources failed\n");
> +		return ret;
> +	}
> +
> +	if (adev->in_s4) {
> +		ret = ttm_device_prepare_hibernation(&adev->mman.bdev);
> +		if (ret)
> +			dev_err(adev->dev, "prepare hibernation failed, %d\n", ret);
> +	}
>  	return ret;
>  }
>