tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
42static const struct drm_driver driver;
43
44static int virtio_gpu_modeset = -1;
45
46MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
47module_param_named(modeset, virtio_gpu_modeset, int, 0400);
48
49static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
50{
51 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
52 const char *pname = dev_name(&pdev->dev);
53 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
54 char unique[20];
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 /*
67 * Normally the drm_dev_set_unique() call is done by core DRM.
68 * The following comment covers, why virtio cannot rely on it.
69 *
70 * Unlike the other virtual GPU drivers, virtio abstracts the
71 * underlying bus type by using struct virtio_device.
72 *
73 * Hence the dev_is_pci() check, used in core DRM, will fail
74 * and the unique returned will be the virtio_device "virtio0",
75 * while a "pci:..." one is required.
76 *
77 * A few other ideas were considered:
78 * - Extend the dev_is_pci() check [in drm_set_busid] to
79 * consider virtio.
80 * Seems like a bigger hack than what we have already.
81 *
82 * - Point drm_device::dev to the parent of the virtio_device
83 * Semantic changes:
84 * * Using the wrong device for i2c, framebuffer_alloc and
85 * prime import.
86 * Visual changes:
87 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
88 * will print the wrong information.
89 *
90 * We could address the latter issues, by introducing
91 * drm_device::bus_dev, ... which would be used solely for this.
92 *
93 * So for the moment keep things as-is, with a bulky comment
94 * for the next person who feels like removing this
95 * drm_dev_set_unique() quirk.
96 */
97 snprintf(unique, sizeof(unique), "pci:%s", pname);
98 return drm_dev_set_unique(dev, unique);
99}
100
101static int virtio_gpu_probe(struct virtio_device *vdev)
102{
103 struct drm_device *dev;
104 int ret;
105
106 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1)
107 return -EINVAL;
108
109 if (virtio_gpu_modeset == 0)
110 return -EINVAL;
111
112 dev = drm_dev_alloc(&driver, &vdev->dev);
113 if (IS_ERR(dev))
114 return PTR_ERR(dev);
115 vdev->priv = dev;
116
117 if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
118 ret = virtio_gpu_pci_quirk(dev, vdev);
119 if (ret)
120 goto err_free;
121 }
122
123 ret = virtio_gpu_init(dev);
124 if (ret)
125 goto err_free;
126
127 ret = drm_dev_register(dev, 0);
128 if (ret)
129 goto err_deinit;
130
131 drm_fbdev_generic_setup(vdev->priv, 32);
132 return 0;
133
134err_deinit:
135 virtio_gpu_deinit(dev);
136err_free:
137 drm_dev_put(dev);
138 return ret;
139}
140
141static void virtio_gpu_remove(struct virtio_device *vdev)
142{
143 struct drm_device *dev = vdev->priv;
144
145 drm_dev_unplug(dev);
146 drm_atomic_helper_shutdown(dev);
147 virtio_gpu_deinit(dev);
148 drm_dev_put(dev);
149}
150
151static void virtio_gpu_config_changed(struct virtio_device *vdev)
152{
153 struct drm_device *dev = vdev->priv;
154 struct virtio_gpu_device *vgdev = dev->dev_private;
155
156 schedule_work(&vgdev->config_changed_work);
157}
158
159static struct virtio_device_id id_table[] = {
160 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
161 { 0 },
162};
163
164static unsigned int features[] = {
165#ifdef __LITTLE_ENDIAN
166 /*
167 * Gallium command stream send by virgl is native endian.
168 * Because of that we only support little endian guests on
169 * little endian hosts.
170 */
171 VIRTIO_GPU_F_VIRGL,
172#endif
173 VIRTIO_GPU_F_EDID,
174 VIRTIO_GPU_F_RESOURCE_UUID,
175 VIRTIO_GPU_F_RESOURCE_BLOB,
176 VIRTIO_GPU_F_CONTEXT_INIT,
177};
178static struct virtio_driver virtio_gpu_driver = {
179 .feature_table = features,
180 .feature_table_size = ARRAY_SIZE(features),
181 .driver.name = KBUILD_MODNAME,
182 .driver.owner = THIS_MODULE,
183 .id_table = id_table,
184 .probe = virtio_gpu_probe,
185 .remove = virtio_gpu_remove,
186 .config_changed = virtio_gpu_config_changed
187};
188
189module_virtio_driver(virtio_gpu_driver);
190
191MODULE_DEVICE_TABLE(virtio, id_table);
192MODULE_DESCRIPTION("Virtio GPU driver");
193MODULE_LICENSE("GPL and additional rights");
194MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
195MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
196MODULE_AUTHOR("Alon Levy");
197
198DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
199
200static const struct drm_driver driver = {
201 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
202 .open = virtio_gpu_driver_open,
203 .postclose = virtio_gpu_driver_postclose,
204
205 .dumb_create = virtio_gpu_mode_dumb_create,
206 .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
207
208#if defined(CONFIG_DEBUG_FS)
209 .debugfs_init = virtio_gpu_debugfs_init,
210#endif
211 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
212 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
213 .gem_prime_mmap = drm_gem_prime_mmap,
214 .gem_prime_import = virtgpu_gem_prime_import,
215 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
216
217 .gem_create_object = virtio_gpu_create_object,
218 .fops = &virtio_gpu_driver_fops,
219
220 .ioctls = virtio_gpu_ioctls,
221 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
222
223 .name = DRIVER_NAME,
224 .desc = DRIVER_DESC,
225 .date = DRIVER_DATE,
226 .major = DRIVER_MAJOR,
227 .minor = DRIVER_MINOR,
228 .patchlevel = DRIVER_PATCHLEVEL,
229
230 .release = virtio_gpu_release,
231};