linux-kernel - Re: [PATCH v2 4/6] drm/amdgpu: Limit info in coredump for kernel threads

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Date:   Fri, 14 Jul 2023 09:52:24 +0200
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     André Almeida <andrealmeid@...lia.com>,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     pierre-eric.pelloux-prayer@....com,
        'Marek Olšák' <maraeo@...il.com>,
        Timur Kristóf <timur.kristof@...il.com>,
        michel.daenzer@...lbox.org,
        Samuel Pitoiset <samuel.pitoiset@...il.com>,
        kernel-dev@...lia.com, Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        alexander.deucher@....com, christian.koenig@....com
Subject: Re: [PATCH v2 4/6] drm/amdgpu: Limit info in coredump for kernel
 threads



Am 13.07.23 um 23:32 schrieb André Almeida:
> If a kernel thread caused the reset, the information available to be
> logged will be limited, so return early in the dump function.

Why? The register values and vram lost state should still be valid.

Christian.

>
> Signed-off-by: André Almeida <andrealmeid@...lia.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index e80670420586..07546781b8b8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -4988,10 +4988,14 @@ static ssize_t amdgpu_devcoredump_read(char *buffer, loff_t offset,
>   	drm_printf(&p, "kernel: " UTS_RELEASE "\n");
>   	drm_printf(&p, "module: " KBUILD_MODNAME "\n");
>   	drm_printf(&p, "time: %lld.%09ld\n", coredump->reset_time.tv_sec, coredump->reset_time.tv_nsec);
> -	if (coredump->reset_task_info.pid)
> +	if (coredump->reset_task_info.pid) {
>   		drm_printf(&p, "process_name: %s PID: %d\n",
>   			   coredump->reset_task_info.process_name,
>   			   coredump->reset_task_info.pid);
> +	} else {
> +		drm_printf(&p, "GPU reset caused by a kernel thread\n");
> +		return count - iter.remain;
> +	}
>   
>   	if (coredump->reset_vram_lost)
>   		drm_printf(&p, "VRAM is lost due to GPU reset!\n");