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 <linux/poll.h>
33 #include <linux/wait.h>
34
35 #include <drm/drm.h>
36 #include <drm/drm_aperture.h>
37 #include <drm/drm_atomic_helper.h>
38 #include <drm/drm_drv.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
virtio_gpu_pci_quirk(struct drm_device * dev,struct virtio_device * vdev)50 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
51 {
52 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
53 const char *pname = dev_name(&pdev->dev);
54 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
55 char unique[20];
56 int ret;
57
58 DRM_INFO("pci: %s detected at %s\n",
59 vga ? "virtio-vga" : "virtio-gpu-pci",
60 pname);
61 if (vga) {
62 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver);
63 if (ret)
64 return ret;
65 }
66
67 /*
68 * Normally the drm_dev_set_unique() call is done by core DRM.
69 * The following comment covers, why virtio cannot rely on it.
70 *
71 * Unlike the other virtual GPU drivers, virtio abstracts the
72 * underlying bus type by using struct virtio_device.
73 *
74 * Hence the dev_is_pci() check, used in core DRM, will fail
75 * and the unique returned will be the virtio_device "virtio0",
76 * while a "pci:..." one is required.
77 *
78 * A few other ideas were considered:
79 * - Extend the dev_is_pci() check [in drm_set_busid] to
80 * consider virtio.
81 * Seems like a bigger hack than what we have already.
82 *
83 * - Point drm_device::dev to the parent of the virtio_device
84 * Semantic changes:
85 * * Using the wrong device for i2c, framebuffer_alloc and
86 * prime import.
87 * Visual changes:
88 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
89 * will print the wrong information.
90 *
91 * We could address the latter issues, by introducing
92 * drm_device::bus_dev, ... which would be used solely for this.
93 *
94 * So for the moment keep things as-is, with a bulky comment
95 * for the next person who feels like removing this
96 * drm_dev_set_unique() quirk.
97 */
98 snprintf(unique, sizeof(unique), "pci:%s", pname);
99 return drm_dev_set_unique(dev, unique);
100 }
101
virtio_gpu_probe(struct virtio_device * vdev)102 static int virtio_gpu_probe(struct virtio_device *vdev)
103 {
104 struct drm_device *dev;
105 int ret;
106
107 if (vgacon_text_force() && virtio_gpu_modeset == -1)
108 return -EINVAL;
109
110 if (virtio_gpu_modeset == 0)
111 return -EINVAL;
112
113 dev = drm_dev_alloc(&driver, &vdev->dev);
114 if (IS_ERR(dev))
115 return PTR_ERR(dev);
116 vdev->priv = dev;
117
118 if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
119 ret = virtio_gpu_pci_quirk(dev, vdev);
120 if (ret)
121 goto err_free;
122 }
123
124 ret = virtio_gpu_init(dev);
125 if (ret)
126 goto err_free;
127
128 ret = drm_dev_register(dev, 0);
129 if (ret)
130 goto err_deinit;
131
132 drm_fbdev_generic_setup(vdev->priv, 32);
133 return 0;
134
135 err_deinit:
136 virtio_gpu_deinit(dev);
137 err_free:
138 drm_dev_put(dev);
139 return ret;
140 }
141
virtio_gpu_remove(struct virtio_device * vdev)142 static void virtio_gpu_remove(struct virtio_device *vdev)
143 {
144 struct drm_device *dev = vdev->priv;
145
146 drm_dev_unplug(dev);
147 drm_atomic_helper_shutdown(dev);
148 virtio_gpu_deinit(dev);
149 drm_dev_put(dev);
150 }
151
virtio_gpu_config_changed(struct virtio_device * vdev)152 static void virtio_gpu_config_changed(struct virtio_device *vdev)
153 {
154 struct drm_device *dev = vdev->priv;
155 struct virtio_gpu_device *vgdev = dev->dev_private;
156
157 schedule_work(&vgdev->config_changed_work);
158 }
159
160 static struct virtio_device_id id_table[] = {
161 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
162 { 0 },
163 };
164
165 static unsigned int features[] = {
166 #ifdef __LITTLE_ENDIAN
167 /*
168 * Gallium command stream send by virgl is native endian.
169 * Because of that we only support little endian guests on
170 * little endian hosts.
171 */
172 VIRTIO_GPU_F_VIRGL,
173 #endif
174 VIRTIO_GPU_F_EDID,
175 VIRTIO_GPU_F_RESOURCE_UUID,
176 VIRTIO_GPU_F_RESOURCE_BLOB,
177 VIRTIO_GPU_F_CONTEXT_INIT,
178 };
179 static struct virtio_driver virtio_gpu_driver = {
180 .feature_table = features,
181 .feature_table_size = ARRAY_SIZE(features),
182 .driver.name = KBUILD_MODNAME,
183 .driver.owner = THIS_MODULE,
184 .id_table = id_table,
185 .probe = virtio_gpu_probe,
186 .remove = virtio_gpu_remove,
187 .config_changed = virtio_gpu_config_changed
188 };
189
190 module_virtio_driver(virtio_gpu_driver);
191
192 MODULE_DEVICE_TABLE(virtio, id_table);
193 MODULE_DESCRIPTION("Virtio GPU driver");
194 MODULE_LICENSE("GPL and additional rights");
195 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
196 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
197 MODULE_AUTHOR("Alon Levy");
198
199 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
200
201 static const struct drm_driver driver = {
202 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
203 .open = virtio_gpu_driver_open,
204 .postclose = virtio_gpu_driver_postclose,
205
206 .dumb_create = virtio_gpu_mode_dumb_create,
207 .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
208
209 #if defined(CONFIG_DEBUG_FS)
210 .debugfs_init = virtio_gpu_debugfs_init,
211 #endif
212 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
213 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
214 .gem_prime_mmap = drm_gem_prime_mmap,
215 .gem_prime_import = virtgpu_gem_prime_import,
216 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
217
218 .gem_create_object = virtio_gpu_create_object,
219 .fops = &virtio_gpu_driver_fops,
220
221 .ioctls = virtio_gpu_ioctls,
222 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
223
224 .name = DRIVER_NAME,
225 .desc = DRIVER_DESC,
226 .date = DRIVER_DATE,
227 .major = DRIVER_MAJOR,
228 .minor = DRIVER_MINOR,
229 .patchlevel = DRIVER_PATCHLEVEL,
230
231 .release = virtio_gpu_release,
232 };
233