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/aperture.h>
30#include <linux/module.h>
31#include <linux/pci.h>
32#include <linux/poll.h>
33#include <linux/vgaarb.h>
34#include <linux/wait.h>
35
36#include <drm/clients/drm_client_setup.h>
37#include <drm/drm.h>
38#include <drm/drm_atomic_helper.h>
39#include <drm/drm_drv.h>
40#include <drm/drm_fbdev_shmem.h>
41#include <drm/drm_file.h>
42#include <drm/drm_print.h>
43
44#include "virtgpu_drv.h"
45
46#define PCI_DEVICE_ID_VIRTIO_GPU 0x1050
47
48static const struct drm_driver driver;
49
50static int virtio_gpu_modeset = -1;
51
52MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
53module_param_named(modeset, virtio_gpu_modeset, int, 0400);
54
55static int virtio_gpu_pci_quirk(struct drm_device *dev)
56{
57 struct pci_dev *pdev = to_pci_dev(dev->dev);
58 const char *pname = dev_name(dev: &pdev->dev);
59 bool vga = pci_is_vga(pdev);
60 int ret;
61
62 DRM_INFO("pci: %s detected at %s\n",
63 vga ? "virtio-vga" : "virtio-gpu-pci",
64 pname);
65 if (vga) {
66 ret = aperture_remove_conflicting_pci_devices(pdev, name: driver.name);
67 if (ret)
68 return ret;
69 }
70
71 return 0;
72}
73
74static int virtio_gpu_probe(struct virtio_device *vdev)
75{
76 struct drm_device *dev;
77 int ret;
78
79 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1)
80 return -EINVAL;
81
82 if (virtio_gpu_modeset == 0)
83 return -EINVAL;
84
85 /*
86 * The virtio-gpu device is a virtual device that doesn't have DMA
87 * ops assigned to it, nor DMA mask set and etc. Its parent device
88 * is actual GPU device we want to use it for the DRM's device in
89 * order to benefit from using generic DRM APIs.
90 */
91 dev = drm_dev_alloc(driver: &driver, parent: vdev->dev.parent);
92 if (IS_ERR(ptr: dev))
93 return PTR_ERR(ptr: dev);
94 vdev->priv = dev;
95
96 if (dev_is_pci(vdev->dev.parent)) {
97 ret = virtio_gpu_pci_quirk(dev);
98 if (ret)
99 goto err_free;
100 }
101
102 dma_set_max_seg_size(dev: dev->dev, size: dma_max_mapping_size(dev: dev->dev) ?: UINT_MAX);
103 ret = virtio_gpu_init(vdev, dev);
104 if (ret)
105 goto err_free;
106
107 ret = drm_dev_register(dev, flags: 0);
108 if (ret)
109 goto err_deinit;
110
111 drm_client_setup(dev: vdev->priv, NULL);
112
113 return 0;
114
115err_deinit:
116 virtio_gpu_deinit(dev);
117err_free:
118 drm_dev_put(dev);
119 return ret;
120}
121
122static void virtio_gpu_remove(struct virtio_device *vdev)
123{
124 struct drm_device *dev = vdev->priv;
125
126 drm_dev_unplug(dev);
127 drm_atomic_helper_shutdown(dev);
128 virtio_gpu_deinit(dev);
129 drm_dev_put(dev);
130}
131
132static void virtio_gpu_shutdown(struct virtio_device *vdev)
133{
134 struct drm_device *dev = vdev->priv;
135
136 /* stop talking to the device */
137 drm_dev_unplug(dev);
138}
139
140static void virtio_gpu_config_changed(struct virtio_device *vdev)
141{
142 struct drm_device *dev = vdev->priv;
143 struct virtio_gpu_device *vgdev = dev->dev_private;
144
145 schedule_work(work: &vgdev->config_changed_work);
146}
147
148static struct virtio_device_id id_table[] = {
149 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
150 { 0 },
151};
152
153static unsigned int features[] = {
154#ifdef __LITTLE_ENDIAN
155 /*
156 * Gallium command stream send by virgl is native endian.
157 * Because of that we only support little endian guests on
158 * little endian hosts.
159 */
160 VIRTIO_GPU_F_VIRGL,
161#endif
162 VIRTIO_GPU_F_EDID,
163 VIRTIO_GPU_F_RESOURCE_UUID,
164 VIRTIO_GPU_F_RESOURCE_BLOB,
165 VIRTIO_GPU_F_CONTEXT_INIT,
166};
167static struct virtio_driver virtio_gpu_driver = {
168 .feature_table = features,
169 .feature_table_size = ARRAY_SIZE(features),
170 .driver.name = KBUILD_MODNAME,
171 .id_table = id_table,
172 .probe = virtio_gpu_probe,
173 .remove = virtio_gpu_remove,
174 .shutdown = virtio_gpu_shutdown,
175 .config_changed = virtio_gpu_config_changed
176};
177
178static int __init virtio_gpu_driver_init(void)
179{
180 struct pci_dev *pdev;
181 int ret;
182
183 pdev = pci_get_device(PCI_VENDOR_ID_REDHAT_QUMRANET,
184 PCI_DEVICE_ID_VIRTIO_GPU,
185 NULL);
186 if (pdev && pci_is_vga(pdev)) {
187 ret = vga_get_interruptible(pdev,
188 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
189 if (ret) {
190 pci_dev_put(dev: pdev);
191 return ret;
192 }
193 }
194
195 ret = register_virtio_driver(&virtio_gpu_driver);
196
197 if (pdev) {
198 if (pci_is_vga(pdev))
199 vga_put(pdev,
200 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
201
202 pci_dev_put(dev: pdev);
203 }
204
205 return ret;
206}
207
208static void __exit virtio_gpu_driver_exit(void)
209{
210 unregister_virtio_driver(drv: &virtio_gpu_driver);
211}
212
213module_init(virtio_gpu_driver_init);
214module_exit(virtio_gpu_driver_exit);
215
216MODULE_DEVICE_TABLE(virtio, id_table);
217MODULE_DESCRIPTION("Virtio GPU driver");
218MODULE_LICENSE("GPL and additional rights");
219MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
220MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
221MODULE_AUTHOR("Alon Levy");
222
223DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
224
225static const struct drm_driver driver = {
226 /*
227 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked
228 * out via drm_device::driver_features:
229 */
230 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC |
231 DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT,
232 .open = virtio_gpu_driver_open,
233 .postclose = virtio_gpu_driver_postclose,
234
235 .dumb_create = virtio_gpu_mode_dumb_create,
236
237 DRM_FBDEV_SHMEM_DRIVER_OPS,
238
239#if defined(CONFIG_DEBUG_FS)
240 .debugfs_init = virtio_gpu_debugfs_init,
241#endif
242 .gem_prime_import = virtgpu_gem_prime_import,
243 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
244
245 .gem_create_object = virtio_gpu_create_object,
246 .fops = &virtio_gpu_driver_fops,
247
248 .ioctls = virtio_gpu_ioctls,
249 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
250
251 .name = DRIVER_NAME,
252 .desc = DRIVER_DESC,
253 .major = DRIVER_MAJOR,
254 .minor = DRIVER_MINOR,
255 .patchlevel = DRIVER_PATCHLEVEL,
256
257 .release = virtio_gpu_release,
258};
259

source code of linux/drivers/gpu/drm/virtio/virtgpu_drv.c