linux-kernel - Re: [PATCH 01/10] drm/virtio: log error responses

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Message-ID: <7af5ce00-d751-5c21-51f9-fdea793fd57b@gmail.com>
Date:   Fri, 21 Dec 2018 11:59:53 +0200
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org,
        David Airlie <airlied@...hat.com>
Cc:     David Airlie <airlied@...ux.ie>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 01/10] drm/virtio: log error responses

On 12/19/18 2:26 PM, Gerd Hoffmann wrote:
> If we got an error response code from the host, print it to the log.
>
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
> ---
>   drivers/gpu/drm/virtio/virtgpu_vq.c | 12 ++++++++++--
>   1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index e27c4aedb8..6bc2008b0d 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -192,8 +192,16 @@ void virtio_gpu_dequeue_ctrl_func(struct work_struct *work)
>   
>   	list_for_each_entry_safe(entry, tmp, &reclaim_list, list) {
>   		resp = (struct virtio_gpu_ctrl_hdr *)entry->resp_buf;
> -		if (resp->type != cpu_to_le32(VIRTIO_GPU_RESP_OK_NODATA))
> -			DRM_DEBUG("response 0x%x\n", le32_to_cpu(resp->type));
> +		if (resp->type != cpu_to_le32(VIRTIO_GPU_RESP_OK_NODATA)) {
> +			if (resp->type >= cpu_to_le32(VIRTIO_GPU_RESP_ERR_UNSPEC)) {
> +				struct virtio_gpu_ctrl_hdr *cmd;
> +				cmd = (struct virtio_gpu_ctrl_hdr *)entry->buf;
> +				DRM_ERROR("response 0x%x (command 0x%x)\n",
> +					  le32_to_cpu(resp->type),
> +					  le32_to_cpu(cmd->type));
> +			} else
> +				DRM_DEBUG("response 0x%x\n", le32_to_cpu(resp->type));
> +		}
>   		if (resp->flags & cpu_to_le32(VIRTIO_GPU_FLAG_FENCE)) {
>   			u64 f = le64_to_cpu(resp->fence_id);
>