1. 根目录:
2. drivers
3. gpu
4. drm
5. virtio
6. virtgpu_drv.c

/*
 * 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[] = {
#ifdef __LITTLE_ENDIAN
	/*
	 * Gallium command stream send by virgl is native endian.
	 * Because of that we only support little endian guests on
	 * little endian hosts.
	 */
	VIRTIO_GPU_F_VIRGL,
#endif
};
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 | DRIVER_PRIME | DRIVER_RENDER,
	.set_busid = drm_virtio_set_busid,
	.load = virtio_gpu_driver_load,
	.unload = virtio_gpu_driver_unload,
	.open = virtio_gpu_driver_open,
	.postclose = virtio_gpu_driver_postclose,

	.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
	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_export = drm_gem_prime_export,
	.gem_prime_import = drm_gem_prime_import,
	.gem_prime_pin = virtgpu_gem_prime_pin,
	.gem_prime_unpin = virtgpu_gem_prime_unpin,
	.gem_prime_get_sg_table = virtgpu_gem_prime_get_sg_table,
	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
	.gem_prime_vmap = virtgpu_gem_prime_vmap,
	.gem_prime_vunmap = virtgpu_gem_prime_vunmap,
	.gem_prime_mmap = virtgpu_gem_prime_mmap,

	.gem_free_object = virtio_gpu_gem_free_object,
	.gem_open_object = virtio_gpu_gem_object_open,
	.gem_close_object = virtio_gpu_gem_object_close,
	.fops = &virtio_gpu_driver_fops,

	.ioctls = virtio_gpu_ioctls,
	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,

	.name = DRIVER_NAME,
	.desc = DRIVER_DESC,
	.date = DRIVER_DATE,
	.major = DRIVER_MAJOR,
	.minor = DRIVER_MINOR,
	.patchlevel = DRIVER_PATCHLEVEL,
};