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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/wait.h>
34
35#include <drm/drm.h>
36#include <drm/drm_atomic_helper.h>
37#include <drm/drm_client_setup.h>
38#include <drm/drm_drv.h>
39#include <drm/drm_fbdev_shmem.h>
40#include <drm/drm_file.h>
41
42#include "virtgpu_drv.h"
43
44static const struct drm_driver driver;
45
46static int virtio_gpu_modeset = -1;
47
48MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
49module_param_named(modeset, virtio_gpu_modeset, int, 0400);
50
51static int virtio_gpu_pci_quirk(struct drm_device *dev)
52{
53 struct pci_dev *pdev = to_pci_dev(dev->dev);
54 const char *pname = dev_name(&pdev->dev);
55 bool vga = pci_is_vga(pdev);
56 int ret;
57
58 DRM_INFO("pci: %s detected at %s\n",
59 vga ? "virtio-vga" : "virtio-gpu-pci",
60 pname);
61 if (vga) {
62 ret = aperture_remove_conflicting_pci_devices(pdev, driver.name);
63 if (ret)
64 return ret;
65 }
66
67 return 0;
68}
69
70static int virtio_gpu_probe(struct virtio_device *vdev)
71{
72 struct drm_device *dev;
73 int ret;
74
75 if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1)
76 return -EINVAL;
77
78 if (virtio_gpu_modeset == 0)
79 return -EINVAL;
80
81 /*
82 * The virtio-gpu device is a virtual device that doesn't have DMA
83 * ops assigned to it, nor DMA mask set and etc. Its parent device
84 * is actual GPU device we want to use it for the DRM's device in
85 * order to benefit from using generic DRM APIs.
86 */
87 dev = drm_dev_alloc(&driver, vdev->dev.parent);
88 if (IS_ERR(dev))
89 return PTR_ERR(dev);
90 vdev->priv = dev;
91
92 if (dev_is_pci(vdev->dev.parent)) {
93 ret = virtio_gpu_pci_quirk(dev);
94 if (ret)
95 goto err_free;
96 }
97
98 dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX);
99 ret = virtio_gpu_init(vdev, dev);
100 if (ret)
101 goto err_free;
102
103 ret = drm_dev_register(dev, 0);
104 if (ret)
105 goto err_deinit;
106
107 drm_client_setup(vdev->priv, NULL);
108
109 return 0;
110
111err_deinit:
112 virtio_gpu_deinit(dev);
113err_free:
114 drm_dev_put(dev);
115 return ret;
116}
117
118static void virtio_gpu_remove(struct virtio_device *vdev)
119{
120 struct drm_device *dev = vdev->priv;
121
122 drm_dev_unplug(dev);
123 drm_atomic_helper_shutdown(dev);
124 virtio_gpu_deinit(dev);
125 drm_dev_put(dev);
126}
127
128static void virtio_gpu_config_changed(struct virtio_device *vdev)
129{
130 struct drm_device *dev = vdev->priv;
131 struct virtio_gpu_device *vgdev = dev->dev_private;
132
133 schedule_work(&vgdev->config_changed_work);
134}
135
136static struct virtio_device_id id_table[] = {
137 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
138 { 0 },
139};
140
141static unsigned int features[] = {
142#ifdef __LITTLE_ENDIAN
143 /*
144 * Gallium command stream send by virgl is native endian.
145 * Because of that we only support little endian guests on
146 * little endian hosts.
147 */
148 VIRTIO_GPU_F_VIRGL,
149#endif
150 VIRTIO_GPU_F_EDID,
151 VIRTIO_GPU_F_RESOURCE_UUID,
152 VIRTIO_GPU_F_RESOURCE_BLOB,
153 VIRTIO_GPU_F_CONTEXT_INIT,
154};
155static struct virtio_driver virtio_gpu_driver = {
156 .feature_table = features,
157 .feature_table_size = ARRAY_SIZE(features),
158 .driver.name = KBUILD_MODNAME,
159 .id_table = id_table,
160 .probe = virtio_gpu_probe,
161 .remove = virtio_gpu_remove,
162 .config_changed = virtio_gpu_config_changed
163};
164
165module_virtio_driver(virtio_gpu_driver);
166
167MODULE_DEVICE_TABLE(virtio, id_table);
168MODULE_DESCRIPTION("Virtio GPU driver");
169MODULE_LICENSE("GPL and additional rights");
170MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
171MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
172MODULE_AUTHOR("Alon Levy");
173
174DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
175
176static const struct drm_driver driver = {
177 /*
178 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked
179 * out via drm_device::driver_features:
180 */
181 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC |
182 DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT,
183 .open = virtio_gpu_driver_open,
184 .postclose = virtio_gpu_driver_postclose,
185
186 .dumb_create = virtio_gpu_mode_dumb_create,
187 .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
188
189 DRM_FBDEV_SHMEM_DRIVER_OPS,
190
191#if defined(CONFIG_DEBUG_FS)
192 .debugfs_init = virtio_gpu_debugfs_init,
193#endif
194 .gem_prime_import = virtgpu_gem_prime_import,
195 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
196
197 .gem_create_object = virtio_gpu_create_object,
198 .fops = &virtio_gpu_driver_fops,
199
200 .ioctls = virtio_gpu_ioctls,
201 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
202
203 .name = DRIVER_NAME,
204 .desc = DRIVER_DESC,
205 .date = DRIVER_DATE,
206 .major = DRIVER_MAJOR,
207 .minor = DRIVER_MINOR,
208 .patchlevel = DRIVER_PATCHLEVEL,
209
210 .release = virtio_gpu_release,
211};
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_drv.h>
35#include <drm/drm_file.h>
36
37#include "virtgpu_drv.h"
38
39static struct drm_driver driver;
40
41static int virtio_gpu_modeset = -1;
42
43MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
44module_param_named(modeset, virtio_gpu_modeset, int, 0400);
45
46static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
47{
48 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
49 const char *pname = dev_name(&pdev->dev);
50 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
51 char unique[20];
52
53 DRM_INFO("pci: %s detected at %s\n",
54 vga ? "virtio-vga" : "virtio-gpu-pci",
55 pname);
56 dev->pdev = pdev;
57 if (vga)
58 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
59 0,
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_unregister(dev);
140 virtio_gpu_deinit(dev);
141 drm_put_dev(dev);
142}
143
144static void virtio_gpu_config_changed(struct virtio_device *vdev)
145{
146 struct drm_device *dev = vdev->priv;
147 struct virtio_gpu_device *vgdev = dev->dev_private;
148
149 schedule_work(&vgdev->config_changed_work);
150}
151
152static struct virtio_device_id id_table[] = {
153 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
154 { 0 },
155};
156
157static unsigned int features[] = {
158#ifdef __LITTLE_ENDIAN
159 /*
160 * Gallium command stream send by virgl is native endian.
161 * Because of that we only support little endian guests on
162 * little endian hosts.
163 */
164 VIRTIO_GPU_F_VIRGL,
165#endif
166 VIRTIO_GPU_F_EDID,
167};
168static struct virtio_driver virtio_gpu_driver = {
169 .feature_table = features,
170 .feature_table_size = ARRAY_SIZE(features),
171 .driver.name = KBUILD_MODNAME,
172 .driver.owner = THIS_MODULE,
173 .id_table = id_table,
174 .probe = virtio_gpu_probe,
175 .remove = virtio_gpu_remove,
176 .config_changed = virtio_gpu_config_changed
177};
178
179module_virtio_driver(virtio_gpu_driver);
180
181MODULE_DEVICE_TABLE(virtio, id_table);
182MODULE_DESCRIPTION("Virtio GPU driver");
183MODULE_LICENSE("GPL and additional rights");
184MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
185MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
186MODULE_AUTHOR("Alon Levy");
187
188static const struct file_operations virtio_gpu_driver_fops = {
189 .owner = THIS_MODULE,
190 .open = drm_open,
191 .mmap = virtio_gpu_mmap,
192 .poll = drm_poll,
193 .read = drm_read,
194 .unlocked_ioctl = drm_ioctl,
195 .release = drm_release,
196 .compat_ioctl = drm_compat_ioctl,
197 .llseek = noop_llseek,
198};
199
200static 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_get_sg_table = virtgpu_gem_prime_get_sg_table,
214 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
215 .gem_prime_vmap = virtgpu_gem_prime_vmap,
216 .gem_prime_vunmap = virtgpu_gem_prime_vunmap,
217 .gem_prime_mmap = virtgpu_gem_prime_mmap,
218
219 .gem_free_object_unlocked = virtio_gpu_gem_free_object,
220 .gem_open_object = virtio_gpu_gem_object_open,
221 .gem_close_object = virtio_gpu_gem_object_close,
222 .fops = &virtio_gpu_driver_fops,
223
224 .ioctls = virtio_gpu_ioctls,
225 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
226
227 .name = DRIVER_NAME,
228 .desc = DRIVER_DESC,
229 .date = DRIVER_DATE,
230 .major = DRIVER_MAJOR,
231 .minor = DRIVER_MINOR,
232 .patchlevel = DRIVER_PATCHLEVEL,
233};