linux-kernel - [PATCH 1/3] drm/virtio: log error responses

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Date:   Wed,  5 Dec 2018 11:53:15 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org, David Airlie <airlied@...hat.com>
Cc:     Gerd Hoffmann <kraxel@...hat.com>, David Airlie <airlied@...ux.ie>,
        virtualization@...ts.linux-foundation.org (open list:VIRTIO GPU DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/3] drm/virtio: log error responses

If we got an error response code from the host, print it to the log.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.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);
 
-- 
2.9.3