vfio/display: core & wireup

Infrastructure for display support.  Must be enabled
using 'display' property.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed By: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/hw/vfio/display.c b/hw/vfio/display.c
new file mode 100644
index 0000000..3e997f8
--- /dev/null
+++ b/hw/vfio/display.c
@@ -0,0 +1,56 @@
+/*
+ * display support for mdev based vgpu devices
+ *
+ * Copyright Red Hat, Inc. 2017
+ *
+ * Authors:
+ *    Gerd Hoffmann
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include <linux/vfio.h>
+#include <sys/ioctl.h>
+
+#include "sysemu/sysemu.h"
+#include "ui/console.h"
+#include "qapi/error.h"
+#include "pci.h"
+
+int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp)
+{
+    struct vfio_device_gfx_plane_info probe;
+    int ret;
+
+    memset(&probe, 0, sizeof(probe));
+    probe.argsz = sizeof(probe);
+    probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_DMABUF;
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
+    if (ret == 0) {
+        error_setg(errp, "vfio-display: dmabuf support not implemented yet");
+        return -1;
+    }
+
+    memset(&probe, 0, sizeof(probe));
+    probe.argsz = sizeof(probe);
+    probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_REGION;
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
+    if (ret == 0) {
+        error_setg(errp, "vfio-display: region support not implemented yet");
+        return -1;
+    }
+
+    if (vdev->display == ON_OFF_AUTO_AUTO) {
+        /* not an error in automatic mode */
+        return 0;
+    }
+
+    error_setg(errp, "vfio: device doesn't support any (known) display method");
+    return -1;
+}
+
+void vfio_display_finalize(VFIOPCIDevice *vdev)
+{
+}