Add virtio gpu driver.

This patch adds a kms driver for the virtio gpu.  The xorg modesetting
driver can handle the device just fine, the framebuffer for fbcon is
there too.

Qemu patches for the host side are under review currently.

The pci version of the device comes in two variants: with and without
vga compatibility.  The former has a extra memory bar for the vga
framebuffer, the later is a pure virtio device.  The only concern for
this driver is that in the virtio-vga case we have to kick out the
firmware framebuffer.

Initial revision has only 2d support, 3d (virgl) support requires
some more work on the qemu side and will be added later.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 136 insertions, 0 deletions

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
new file mode 100644
index 000000000000..7d9610aaeff9
--- /dev/null
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Authors:
+ *    Dave Airlie <airlied@redhat.com>
+ *    Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/pci.h>
+#include "drmP.h"
+#include "drm/drm.h"
+
+#include "virtgpu_drv.h"
+static struct drm_driver driver;
+
+static int virtio_gpu_modeset = -1;
+
+MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
+module_param_named(modeset, virtio_gpu_modeset, int, 0400);
+
+static int virtio_gpu_probe(struct virtio_device *vdev)
+{
+#ifdef CONFIG_VGA_CONSOLE
+	if (vgacon_text_force() && virtio_gpu_modeset == -1)
+		return -EINVAL;
+#endif
+
+	if (virtio_gpu_modeset == 0)
+		return -EINVAL;
+
+	return drm_virtio_init(&driver, vdev);
+}
+
+static void virtio_gpu_remove(struct virtio_device *vdev)
+{
+	struct drm_device *dev = vdev->priv;
+	drm_put_dev(dev);
+}
+
+static void virtio_gpu_config_changed(struct virtio_device *vdev)
+{
+	struct drm_device *dev = vdev->priv;
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+
+	schedule_work(&vgdev->config_changed_work);
+}
+
+static struct virtio_device_id id_table[] = {
+	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
+	{ 0 },
+};
+
+static unsigned int features[] = {
+};
+static struct virtio_driver virtio_gpu_driver = {
+	.feature_table = features,
+	.feature_table_size = ARRAY_SIZE(features),
+	.driver.name = KBUILD_MODNAME,
+	.driver.owner = THIS_MODULE,
+	.id_table = id_table,
+	.probe = virtio_gpu_probe,
+	.remove = virtio_gpu_remove,
+	.config_changed = virtio_gpu_config_changed
+};
+
+module_virtio_driver(virtio_gpu_driver);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio GPU driver");
+MODULE_LICENSE("GPL and additional rights");
+MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
+MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
+MODULE_AUTHOR("Alon Levy");
+
+static const struct file_operations virtio_gpu_driver_fops = {
+	.owner = THIS_MODULE,
+	.open = drm_open,
+	.mmap = virtio_gpu_mmap,
+	.poll = drm_poll,
+	.read = drm_read,
+	.unlocked_ioctl	= drm_ioctl,
+	.release = drm_release,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = drm_compat_ioctl,
+#endif
+	.llseek = noop_llseek,
+};
+
+
+static struct drm_driver driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM,
+	.set_busid = drm_virtio_set_busid,
+	.load = virtio_gpu_driver_load,
+	.unload = virtio_gpu_driver_unload,
+
+	.dumb_create = virtio_gpu_mode_dumb_create,
+	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
+	.dumb_destroy = virtio_gpu_mode_dumb_destroy,
+
+#if defined(CONFIG_DEBUG_FS)
+	.debugfs_init = virtio_gpu_debugfs_init,
+	.debugfs_cleanup = virtio_gpu_debugfs_takedown,
+#endif
+
+	.gem_free_object = virtio_gpu_gem_free_object,
+	.fops = &virtio_gpu_driver_fops,
+
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+	.patchlevel = DRIVER_PATCHLEVEL,
+};