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_fbdev_generic.h>
39 #include <drm/drm_file.h>
40 
41 #include "virtgpu_drv.h"
42 
43 static const struct drm_driver driver;
44 
45 static int virtio_gpu_modeset = -1;
46 
47 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
48 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
49 
50 static int virtio_gpu_pci_quirk(struct drm_device *dev)
51 {
52 	struct pci_dev *pdev = to_pci_dev(dev->dev);
53 	const char *pname = dev_name(&pdev->dev);
54 	bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
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 	return 0;
67 }
68 
69 static int virtio_gpu_probe(struct virtio_device *vdev)
70 {
71 	struct drm_device *dev;
72 	int ret;
73 
74 	if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1)
75 		return -EINVAL;
76 
77 	if (virtio_gpu_modeset == 0)
78 		return -EINVAL;
79 
80 	/*
81 	 * The virtio-gpu device is a virtual device that doesn't have DMA
82 	 * ops assigned to it, nor DMA mask set and etc. Its parent device
83 	 * is actual GPU device we want to use it for the DRM's device in
84 	 * order to benefit from using generic DRM APIs.
85 	 */
86 	dev = drm_dev_alloc(&driver, vdev->dev.parent);
87 	if (IS_ERR(dev))
88 		return PTR_ERR(dev);
89 	vdev->priv = dev;
90 
91 	if (dev_is_pci(vdev->dev.parent)) {
92 		ret = virtio_gpu_pci_quirk(dev);
93 		if (ret)
94 			goto err_free;
95 	}
96 
97 	dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX);
98 	ret = virtio_gpu_init(vdev, dev);
99 	if (ret)
100 		goto err_free;
101 
102 	ret = drm_dev_register(dev, 0);
103 	if (ret)
104 		goto err_deinit;
105 
106 	drm_fbdev_generic_setup(vdev->priv, 32);
107 	return 0;
108 
109 err_deinit:
110 	virtio_gpu_deinit(dev);
111 err_free:
112 	drm_dev_put(dev);
113 	return ret;
114 }
115 
116 static void virtio_gpu_remove(struct virtio_device *vdev)
117 {
118 	struct drm_device *dev = vdev->priv;
119 
120 	drm_dev_unplug(dev);
121 	drm_atomic_helper_shutdown(dev);
122 	virtio_gpu_deinit(dev);
123 	drm_dev_put(dev);
124 }
125 
126 static void virtio_gpu_config_changed(struct virtio_device *vdev)
127 {
128 	struct drm_device *dev = vdev->priv;
129 	struct virtio_gpu_device *vgdev = dev->dev_private;
130 
131 	schedule_work(&vgdev->config_changed_work);
132 }
133 
134 static struct virtio_device_id id_table[] = {
135 	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
136 	{ 0 },
137 };
138 
139 static unsigned int features[] = {
140 #ifdef __LITTLE_ENDIAN
141 	/*
142 	 * Gallium command stream send by virgl is native endian.
143 	 * Because of that we only support little endian guests on
144 	 * little endian hosts.
145 	 */
146 	VIRTIO_GPU_F_VIRGL,
147 #endif
148 	VIRTIO_GPU_F_EDID,
149 	VIRTIO_GPU_F_RESOURCE_UUID,
150 	VIRTIO_GPU_F_RESOURCE_BLOB,
151 	VIRTIO_GPU_F_CONTEXT_INIT,
152 };
153 static struct virtio_driver virtio_gpu_driver = {
154 	.feature_table = features,
155 	.feature_table_size = ARRAY_SIZE(features),
156 	.driver.name = KBUILD_MODNAME,
157 	.driver.owner = THIS_MODULE,
158 	.id_table = id_table,
159 	.probe = virtio_gpu_probe,
160 	.remove = virtio_gpu_remove,
161 	.config_changed = virtio_gpu_config_changed
162 };
163 
164 module_virtio_driver(virtio_gpu_driver);
165 
166 MODULE_DEVICE_TABLE(virtio, id_table);
167 MODULE_DESCRIPTION("Virtio GPU driver");
168 MODULE_LICENSE("GPL and additional rights");
169 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
170 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
171 MODULE_AUTHOR("Alon Levy");
172 
173 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
174 
175 static const struct drm_driver driver = {
176 	/*
177 	 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked
178 	 * out via drm_device::driver_features:
179 	 */
180 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC |
181 			   DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT,
182 	.open = virtio_gpu_driver_open,
183 	.postclose = virtio_gpu_driver_postclose,
184 
185 	.dumb_create = virtio_gpu_mode_dumb_create,
186 	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
187 
188 #if defined(CONFIG_DEBUG_FS)
189 	.debugfs_init = virtio_gpu_debugfs_init,
190 #endif
191 	.gem_prime_import = virtgpu_gem_prime_import,
192 	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
193 
194 	.gem_create_object = virtio_gpu_create_object,
195 	.fops = &virtio_gpu_driver_fops,
196 
197 	.ioctls = virtio_gpu_ioctls,
198 	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
199 
200 	.name = DRIVER_NAME,
201 	.desc = DRIVER_DESC,
202 	.date = DRIVER_DATE,
203 	.major = DRIVER_MAJOR,
204 	.minor = DRIVER_MINOR,
205 	.patchlevel = DRIVER_PATCHLEVEL,
206 
207 	.release = virtio_gpu_release,
208 };
209