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