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