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/pci.h>
31 #include <linux/poll.h>
32 #include <linux/wait.h>
33 
34 #include <drm/drm.h>
35 #include <drm/drm_aperture.h>
36 #include <drm/drm_atomic_helper.h>
37 #include <drm/drm_drv.h>
38 #include <drm/drm_fbdev_generic.h>
39 #include <drm/drm_file.h>
40 
41 #include "virtgpu_drv.h"
42 
43 static const struct drm_driver driver;
44 
45 static int virtio_gpu_modeset = -1;
46 
47 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
48 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
49 
50 static int virtio_gpu_pci_quirk(struct drm_device *dev)
51 {
52 	struct pci_dev *pdev = to_pci_dev(dev->dev);
53 	const char *pname = dev_name(&pdev->dev);
54 	bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
55 	int ret;
56 
57 	DRM_INFO("pci: %s detected at %s\n",
58 		 vga ? "virtio-vga" : "virtio-gpu-pci",
59 		 pname);
60 	if (vga) {
61 		ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver);
62 		if (ret)
63 			return ret;
64 	}
65 
66 	return 0;
67 }
68 
69 static int virtio_gpu_probe(struct virtio_device *vdev)
70 {
71 	struct drm_device *dev;
72 	int ret;
73 
74 	if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1)
75 		return -EINVAL;
76 
77 	if (virtio_gpu_modeset == 0)
78 		return -EINVAL;
79 
80 	/*
81 	 * The virtio-gpu device is a virtual device that doesn't have DMA
82 	 * ops assigned to it, nor DMA mask set and etc. Its parent device
83 	 * is actual GPU device we want to use it for the DRM's device in
84 	 * order to benefit from using generic DRM APIs.
85 	 */
86 	dev = drm_dev_alloc(&driver, vdev->dev.parent);
87 	if (IS_ERR(dev))
88 		return PTR_ERR(dev);
89 	vdev->priv = dev;
90 
91 	if (dev_is_pci(vdev->dev.parent)) {
92 		ret = virtio_gpu_pci_quirk(dev);
93 		if (ret)
94 			goto err_free;
95 	}
96 
97 	ret = virtio_gpu_init(vdev, dev);
98 	if (ret)
99 		goto err_free;
100 
101 	ret = drm_dev_register(dev, 0);
102 	if (ret)
103 		goto err_deinit;
104 
105 	drm_fbdev_generic_setup(vdev->priv, 32);
106 	return 0;
107 
108 err_deinit:
109 	virtio_gpu_deinit(dev);
110 err_free:
111 	drm_dev_put(dev);
112 	return ret;
113 }
114 
115 static void virtio_gpu_remove(struct virtio_device *vdev)
116 {
117 	struct drm_device *dev = vdev->priv;
118 
119 	drm_dev_unplug(dev);
120 	drm_atomic_helper_shutdown(dev);
121 	virtio_gpu_deinit(dev);
122 	drm_dev_put(dev);
123 }
124 
125 static void virtio_gpu_config_changed(struct virtio_device *vdev)
126 {
127 	struct drm_device *dev = vdev->priv;
128 	struct virtio_gpu_device *vgdev = dev->dev_private;
129 
130 	schedule_work(&vgdev->config_changed_work);
131 }
132 
133 static struct virtio_device_id id_table[] = {
134 	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
135 	{ 0 },
136 };
137 
138 static unsigned int features[] = {
139 #ifdef __LITTLE_ENDIAN
140 	/*
141 	 * Gallium command stream send by virgl is native endian.
142 	 * Because of that we only support little endian guests on
143 	 * little endian hosts.
144 	 */
145 	VIRTIO_GPU_F_VIRGL,
146 #endif
147 	VIRTIO_GPU_F_EDID,
148 	VIRTIO_GPU_F_RESOURCE_UUID,
149 	VIRTIO_GPU_F_RESOURCE_BLOB,
150 	VIRTIO_GPU_F_CONTEXT_INIT,
151 };
152 static struct virtio_driver virtio_gpu_driver = {
153 	.feature_table = features,
154 	.feature_table_size = ARRAY_SIZE(features),
155 	.driver.name = KBUILD_MODNAME,
156 	.driver.owner = THIS_MODULE,
157 	.id_table = id_table,
158 	.probe = virtio_gpu_probe,
159 	.remove = virtio_gpu_remove,
160 	.config_changed = virtio_gpu_config_changed
161 };
162 
163 module_virtio_driver(virtio_gpu_driver);
164 
165 MODULE_DEVICE_TABLE(virtio, id_table);
166 MODULE_DESCRIPTION("Virtio GPU driver");
167 MODULE_LICENSE("GPL and additional rights");
168 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
169 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
170 MODULE_AUTHOR("Alon Levy");
171 
172 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
173 
174 static const struct drm_driver driver = {
175 	/*
176 	 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked
177 	 * out via drm_device::driver_features:
178 	 */
179 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC |
180 			   DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE,
181 	.open = virtio_gpu_driver_open,
182 	.postclose = virtio_gpu_driver_postclose,
183 
184 	.dumb_create = virtio_gpu_mode_dumb_create,
185 	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
186 
187 #if defined(CONFIG_DEBUG_FS)
188 	.debugfs_init = virtio_gpu_debugfs_init,
189 #endif
190 	.gem_prime_import = virtgpu_gem_prime_import,
191 	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
192 
193 	.gem_create_object = virtio_gpu_create_object,
194 	.fops = &virtio_gpu_driver_fops,
195 
196 	.ioctls = virtio_gpu_ioctls,
197 	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
198 
199 	.name = DRIVER_NAME,
200 	.desc = DRIVER_DESC,
201 	.date = DRIVER_DATE,
202 	.major = DRIVER_MAJOR,
203 	.minor = DRIVER_MINOR,
204 	.patchlevel = DRIVER_PATCHLEVEL,
205 
206 	.release = virtio_gpu_release,
207 };
208