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.zh...@amd.com>
Reviewed-by: Christian König <christian.koe...@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;
> }
>
