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_atomic_helper.h>
35#include <drm/drm_drv.h>
36#include <drm/drm_file.h>
37
38#include "virtgpu_drv.h"
39
40static struct drm_driver driver;
41
42static int virtio_gpu_modeset = -1;
43
44MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
45module_param_named(modeset, virtio_gpu_modeset, int, 0400);
46
47static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
48{
49	struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
50	const char *pname = dev_name(&pdev->dev);
51	bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
52	char unique[20];
53
54	DRM_INFO("pci: %s detected at %s\n",
55		 vga ? "virtio-vga" : "virtio-gpu-pci",
56		 pname);
57	dev->pdev = pdev;
58	if (vga)
59		drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
60								  "virtiodrmfb");
61
62	/*
63	 * Normally the drm_dev_set_unique() call is done by core DRM.
64	 * The following comment covers, why virtio cannot rely on it.
65	 *
66	 * Unlike the other virtual GPU drivers, virtio abstracts the
67	 * underlying bus type by using struct virtio_device.
68	 *
69	 * Hence the dev_is_pci() check, used in core DRM, will fail
70	 * and the unique returned will be the virtio_device "virtio0",
71	 * while a "pci:..." one is required.
72	 *
73	 * A few other ideas were considered:
74	 * - Extend the dev_is_pci() check [in drm_set_busid] to
75	 *   consider virtio.
76	 *   Seems like a bigger hack than what we have already.
77	 *
78	 * - Point drm_device::dev to the parent of the virtio_device
79	 *   Semantic changes:
80	 *   * Using the wrong device for i2c, framebuffer_alloc and
81	 *     prime import.
82	 *   Visual changes:
83	 *   * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
84	 *     will print the wrong information.
85	 *
86	 * We could address the latter issues, by introducing
87	 * drm_device::bus_dev, ... which would be used solely for this.
88	 *
89	 * So for the moment keep things as-is, with a bulky comment
90	 * for the next person who feels like removing this
91	 * drm_dev_set_unique() quirk.
92	 */
93	snprintf(unique, sizeof(unique), "pci:%s", pname);
94	return drm_dev_set_unique(dev, unique);
95}
96
97static int virtio_gpu_probe(struct virtio_device *vdev)
98{
99	struct drm_device *dev;
100	int ret;
101
102	if (vgacon_text_force() && virtio_gpu_modeset == -1)
103		return -EINVAL;
104
105	if (virtio_gpu_modeset == 0)
106		return -EINVAL;
107
108	dev = drm_dev_alloc(&driver, &vdev->dev);
109	if (IS_ERR(dev))
110		return PTR_ERR(dev);
111	vdev->priv = dev;
112
113	if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
114		ret = virtio_gpu_pci_quirk(dev, vdev);
115		if (ret)
116			goto err_free;
117	}
118
119	ret = virtio_gpu_init(dev);
120	if (ret)
121		goto err_free;
122
123	ret = drm_dev_register(dev, 0);
124	if (ret)
125		goto err_free;
126
127	drm_fbdev_generic_setup(vdev->priv, 32);
128	return 0;
129
130err_free:
131	drm_dev_put(dev);
132	return ret;
133}
134
135static void virtio_gpu_remove(struct virtio_device *vdev)
136{
137	struct drm_device *dev = vdev->priv;
138
139	drm_dev_unplug(dev);
140	drm_atomic_helper_shutdown(dev);
141	virtio_gpu_deinit(dev);
142	drm_dev_put(dev);
143}
144
145static void virtio_gpu_config_changed(struct virtio_device *vdev)
146{
147	struct drm_device *dev = vdev->priv;
148	struct virtio_gpu_device *vgdev = dev->dev_private;
149
150	schedule_work(&vgdev->config_changed_work);
151}
152
153static struct virtio_device_id id_table[] = {
154	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
155	{ 0 },
156};
157
158static unsigned int features[] = {
159#ifdef __LITTLE_ENDIAN
160	/*
161	 * Gallium command stream send by virgl is native endian.
162	 * Because of that we only support little endian guests on
163	 * little endian hosts.
164	 */
165	VIRTIO_GPU_F_VIRGL,
166#endif
167	VIRTIO_GPU_F_EDID,
168	VIRTIO_GPU_F_RESOURCE_UUID,
169};
170static struct virtio_driver virtio_gpu_driver = {
171	.feature_table = features,
172	.feature_table_size = ARRAY_SIZE(features),
173	.driver.name = KBUILD_MODNAME,
174	.driver.owner = THIS_MODULE,
175	.id_table = id_table,
176	.probe = virtio_gpu_probe,
177	.remove = virtio_gpu_remove,
178	.config_changed = virtio_gpu_config_changed
179};
180
181module_virtio_driver(virtio_gpu_driver);
182
183MODULE_DEVICE_TABLE(virtio, id_table);
184MODULE_DESCRIPTION("Virtio GPU driver");
185MODULE_LICENSE("GPL and additional rights");
186MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
187MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
188MODULE_AUTHOR("Alon Levy");
189
190DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
191
192static struct drm_driver driver = {
193	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
194	.open = virtio_gpu_driver_open,
195	.postclose = virtio_gpu_driver_postclose,
196
197	.dumb_create = virtio_gpu_mode_dumb_create,
198	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
199
200#if defined(CONFIG_DEBUG_FS)
201	.debugfs_init = virtio_gpu_debugfs_init,
202#endif
203	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
204	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
205	.gem_prime_mmap = drm_gem_prime_mmap,
206	.gem_prime_export = virtgpu_gem_prime_export,
207	.gem_prime_import = virtgpu_gem_prime_import,
208	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
209
210	.gem_create_object = virtio_gpu_create_object,
211	.fops = &virtio_gpu_driver_fops,
212
213	.ioctls = virtio_gpu_ioctls,
214	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
215
216	.name = DRIVER_NAME,
217	.desc = DRIVER_DESC,
218	.date = DRIVER_DATE,
219	.major = DRIVER_MAJOR,
220	.minor = DRIVER_MINOR,
221	.patchlevel = DRIVER_PATCHLEVEL,
222
223	.release = virtio_gpu_release,
224};
225