1 /*
2  * Copyright (C) 2015 Red Hat, Inc.
3  * All Rights Reserved.
4  *
5  * Authors:
6  *    Dave Airlie <airlied@redhat.com>
7  *    Gerd Hoffmann <kraxel@redhat.com>
8  *
9  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice (including the next
17  * paragraph) shall be included in all copies or substantial portions of the
18  * Software.
19  *
20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26  * OTHER DEALINGS IN THE SOFTWARE.
27  */
28 
29 #include <linux/module.h>
30 #include <linux/console.h>
31 #include <linux/pci.h>
32 #include <drm/drmP.h>
33 #include <drm/drm.h>
34 
35 #include "virtgpu_drv.h"
36 static struct drm_driver driver;
37 
38 static int virtio_gpu_modeset = -1;
39 
40 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
41 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
42 
43 static int virtio_gpu_probe(struct virtio_device *vdev)
44 {
45 	if (vgacon_text_force() && virtio_gpu_modeset == -1)
46 		return -EINVAL;
47 
48 	if (virtio_gpu_modeset == 0)
49 		return -EINVAL;
50 
51 	return drm_virtio_init(&driver, vdev);
52 }
53 
54 static void virtio_gpu_remove(struct virtio_device *vdev)
55 {
56 	struct drm_device *dev = vdev->priv;
57 
58 	drm_put_dev(dev);
59 }
60 
61 static void virtio_gpu_config_changed(struct virtio_device *vdev)
62 {
63 	struct drm_device *dev = vdev->priv;
64 	struct virtio_gpu_device *vgdev = dev->dev_private;
65 
66 	schedule_work(&vgdev->config_changed_work);
67 }
68 
69 static struct virtio_device_id id_table[] = {
70 	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
71 	{ 0 },
72 };
73 
74 static unsigned int features[] = {
75 #ifdef __LITTLE_ENDIAN
76 	/*
77 	 * Gallium command stream send by virgl is native endian.
78 	 * Because of that we only support little endian guests on
79 	 * little endian hosts.
80 	 */
81 	VIRTIO_GPU_F_VIRGL,
82 #endif
83 	VIRTIO_GPU_F_EDID,
84 };
85 static struct virtio_driver virtio_gpu_driver = {
86 	.feature_table = features,
87 	.feature_table_size = ARRAY_SIZE(features),
88 	.driver.name = KBUILD_MODNAME,
89 	.driver.owner = THIS_MODULE,
90 	.id_table = id_table,
91 	.probe = virtio_gpu_probe,
92 	.remove = virtio_gpu_remove,
93 	.config_changed = virtio_gpu_config_changed
94 };
95 
96 module_virtio_driver(virtio_gpu_driver);
97 
98 MODULE_DEVICE_TABLE(virtio, id_table);
99 MODULE_DESCRIPTION("Virtio GPU driver");
100 MODULE_LICENSE("GPL and additional rights");
101 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
102 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
103 MODULE_AUTHOR("Alon Levy");
104 
105 static const struct file_operations virtio_gpu_driver_fops = {
106 	.owner = THIS_MODULE,
107 	.open = drm_open,
108 	.mmap = virtio_gpu_mmap,
109 	.poll = drm_poll,
110 	.read = drm_read,
111 	.unlocked_ioctl	= drm_ioctl,
112 	.release = drm_release,
113 	.compat_ioctl = drm_compat_ioctl,
114 	.llseek = noop_llseek,
115 };
116 
117 static struct drm_driver driver = {
118 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_RENDER | DRIVER_ATOMIC,
119 	.load = virtio_gpu_driver_load,
120 	.unload = virtio_gpu_driver_unload,
121 	.open = virtio_gpu_driver_open,
122 	.postclose = virtio_gpu_driver_postclose,
123 
124 	.dumb_create = virtio_gpu_mode_dumb_create,
125 	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
126 
127 #if defined(CONFIG_DEBUG_FS)
128 	.debugfs_init = virtio_gpu_debugfs_init,
129 #endif
130 	.gem_prime_export = drm_gem_prime_export,
131 	.gem_prime_import = drm_gem_prime_import,
132 	.gem_prime_pin = virtgpu_gem_prime_pin,
133 	.gem_prime_unpin = virtgpu_gem_prime_unpin,
134 	.gem_prime_vmap = virtgpu_gem_prime_vmap,
135 	.gem_prime_vunmap = virtgpu_gem_prime_vunmap,
136 	.gem_prime_mmap = virtgpu_gem_prime_mmap,
137 
138 	.gem_free_object_unlocked = virtio_gpu_gem_free_object,
139 	.gem_open_object = virtio_gpu_gem_object_open,
140 	.gem_close_object = virtio_gpu_gem_object_close,
141 	.fops = &virtio_gpu_driver_fops,
142 
143 	.ioctls = virtio_gpu_ioctls,
144 	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
145 
146 	.name = DRIVER_NAME,
147 	.desc = DRIVER_DESC,
148 	.date = DRIVER_DATE,
149 	.major = DRIVER_MAJOR,
150 	.minor = DRIVER_MINOR,
151 	.patchlevel = DRIVER_PATCHLEVEL,
152 };
153