linux-kernel - Re: [PATCH] drm/amdgpu: fix suspend/resume hang regression

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Date:   Tue, 1 Mar 2022 08:48:15 +0100
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     Qiang Yu <qiang.yu@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amdgpu: fix suspend/resume hang regression

Am 01.03.22 um 07:26 schrieb Qiang Yu:
> Regression has been reported that suspend/resume may hang with
> the previous vm ready check commit:
> https://gitlab.freedesktop.org/drm/amd/-/issues/1915#note_1278198
>
> So bring back the evicted list check as a temp fix.
>
> Fixes: cc8dd2cc1a97 ("drm/amdgpu: check vm ready by amdgpu_vm->evicting flag")
> Signed-off-by: Qiang Yu <qiang.yu@....com>

Reviewed-by: Christian König <christian.koenig@....com>
Cc: <stable@...r.kernel.org>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 2cd9f1a2e5fa..fc4563cf2828 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -779,7 +779,8 @@ bool amdgpu_vm_ready(struct amdgpu_vm *vm)
>   	amdgpu_vm_eviction_lock(vm);
>   	ret = !vm->evicting;
>   	amdgpu_vm_eviction_unlock(vm);
> -	return ret;
> +
> +	return ret && list_empty(&vm->evicted);
>   }
>   
>   /**