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
33 #include <drm/drm.h>
34 #include <drm/drm_aperture.h>
35 #include <drm/drm_atomic_helper.h>
36 #include <drm/drm_drv.h>
37 #include <drm/drm_file.h>
38
39 #include "virtgpu_drv.h"
40
41 static const struct drm_driver driver;
42
43 static int virtio_gpu_modeset = -1;
44
45 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
46 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
47
virtio_gpu_pci_quirk(struct drm_device * dev,struct virtio_device * vdev)48 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
49 {
50 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
51 const char *pname = dev_name(&pdev->dev);
52 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
53 char unique[20];
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 /*
66 * Normally the drm_dev_set_unique() call is done by core DRM.
67 * The following comment covers, why virtio cannot rely on it.
68 *
69 * Unlike the other virtual GPU drivers, virtio abstracts the
70 * underlying bus type by using struct virtio_device.
71 *
72 * Hence the dev_is_pci() check, used in core DRM, will fail
73 * and the unique returned will be the virtio_device "virtio0",
74 * while a "pci:..." one is required.
75 *
76 * A few other ideas were considered:
77 * - Extend the dev_is_pci() check [in drm_set_busid] to
78 * consider virtio.
79 * Seems like a bigger hack than what we have already.
80 *
81 * - Point drm_device::dev to the parent of the virtio_device
82 * Semantic changes:
83 * * Using the wrong device for i2c, framebuffer_alloc and
84 * prime import.
85 * Visual changes:
86 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
87 * will print the wrong information.
88 *
89 * We could address the latter issues, by introducing
90 * drm_device::bus_dev, ... which would be used solely for this.
91 *
92 * So for the moment keep things as-is, with a bulky comment
93 * for the next person who feels like removing this
94 * drm_dev_set_unique() quirk.
95 */
96 snprintf(unique, sizeof(unique), "pci:%s", pname);
97 return drm_dev_set_unique(dev, unique);
98 }
99
virtio_gpu_probe(struct virtio_device * vdev)100 static int virtio_gpu_probe(struct virtio_device *vdev)
101 {
102 struct drm_device *dev;
103 int ret;
104
105 if (vgacon_text_force() && virtio_gpu_modeset == -1)
106 return -EINVAL;
107
108 if (virtio_gpu_modeset == 0)
109 return -EINVAL;
110
111 dev = drm_dev_alloc(&driver, &vdev->dev);
112 if (IS_ERR(dev))
113 return PTR_ERR(dev);
114 vdev->priv = dev;
115
116 if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
117 ret = virtio_gpu_pci_quirk(dev, vdev);
118 if (ret)
119 goto err_free;
120 }
121
122 ret = virtio_gpu_init(dev);
123 if (ret)
124 goto err_free;
125
126 ret = drm_dev_register(dev, 0);
127 if (ret)
128 goto err_deinit;
129
130 drm_fbdev_generic_setup(vdev->priv, 32);
131 return 0;
132
133 err_deinit:
134 virtio_gpu_deinit(dev);
135 err_free:
136 drm_dev_put(dev);
137 return ret;
138 }
139
virtio_gpu_remove(struct virtio_device * vdev)140 static void virtio_gpu_remove(struct virtio_device *vdev)
141 {
142 struct drm_device *dev = vdev->priv;
143
144 drm_dev_unplug(dev);
145 drm_atomic_helper_shutdown(dev);
146 virtio_gpu_deinit(dev);
147 drm_dev_put(dev);
148 }
149
virtio_gpu_config_changed(struct virtio_device * vdev)150 static void virtio_gpu_config_changed(struct virtio_device *vdev)
151 {
152 struct drm_device *dev = vdev->priv;
153 struct virtio_gpu_device *vgdev = dev->dev_private;
154
155 schedule_work(&vgdev->config_changed_work);
156 }
157
158 static struct virtio_device_id id_table[] = {
159 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
160 { 0 },
161 };
162
163 static unsigned int features[] = {
164 #ifdef __LITTLE_ENDIAN
165 /*
166 * Gallium command stream send by virgl is native endian.
167 * Because of that we only support little endian guests on
168 * little endian hosts.
169 */
170 VIRTIO_GPU_F_VIRGL,
171 #endif
172 VIRTIO_GPU_F_EDID,
173 VIRTIO_GPU_F_RESOURCE_UUID,
174 VIRTIO_GPU_F_RESOURCE_BLOB,
175 };
176 static struct virtio_driver virtio_gpu_driver = {
177 .feature_table = features,
178 .feature_table_size = ARRAY_SIZE(features),
179 .driver.name = KBUILD_MODNAME,
180 .driver.owner = THIS_MODULE,
181 .id_table = id_table,
182 .probe = virtio_gpu_probe,
183 .remove = virtio_gpu_remove,
184 .config_changed = virtio_gpu_config_changed
185 };
186
187 module_virtio_driver(virtio_gpu_driver);
188
189 MODULE_DEVICE_TABLE(virtio, id_table);
190 MODULE_DESCRIPTION("Virtio GPU driver");
191 MODULE_LICENSE("GPL and additional rights");
192 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
193 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
194 MODULE_AUTHOR("Alon Levy");
195
196 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
197
198 static const struct drm_driver driver = {
199 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
200 .open = virtio_gpu_driver_open,
201 .postclose = virtio_gpu_driver_postclose,
202
203 .dumb_create = virtio_gpu_mode_dumb_create,
204 .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
205
206 #if defined(CONFIG_DEBUG_FS)
207 .debugfs_init = virtio_gpu_debugfs_init,
208 #endif
209 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
210 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
211 .gem_prime_mmap = drm_gem_prime_mmap,
212 .gem_prime_import = virtgpu_gem_prime_import,
213 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
214
215 .gem_create_object = virtio_gpu_create_object,
216 .fops = &virtio_gpu_driver_fops,
217
218 .ioctls = virtio_gpu_ioctls,
219 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
220
221 .name = DRIVER_NAME,
222 .desc = DRIVER_DESC,
223 .date = DRIVER_DATE,
224 .major = DRIVER_MAJOR,
225 .minor = DRIVER_MINOR,
226 .patchlevel = DRIVER_PATCHLEVEL,
227
228 .release = virtio_gpu_release,
229 };
230