2 * Copyright (C) 2015 Red Hat, Inc.
6 * Dave Airlie <airlied@redhat.com>
7 * Gerd Hoffmann <kraxel@redhat.com>
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:
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
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.
29 #include <linux/module.h>
30 #include <linux/console.h>
31 #include <linux/pci.h>
34 #include <drm/drm_atomic_helper.h>
35 #include <drm/drm_drv.h>
36 #include <drm/drm_file.h>
38 #include "virtgpu_drv.h"
40 static const struct drm_driver driver;
42 static int virtio_gpu_modeset = -1;
44 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
45 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
47 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
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;
54 DRM_INFO("pci: %s detected at %s\n",
55 vga ? "virtio-vga" : "virtio-gpu-pci",
58 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
62 * Normally the drm_dev_set_unique() call is done by core DRM.
63 * The following comment covers, why virtio cannot rely on it.
65 * Unlike the other virtual GPU drivers, virtio abstracts the
66 * underlying bus type by using struct virtio_device.
68 * Hence the dev_is_pci() check, used in core DRM, will fail
69 * and the unique returned will be the virtio_device "virtio0",
70 * while a "pci:..." one is required.
72 * A few other ideas were considered:
73 * - Extend the dev_is_pci() check [in drm_set_busid] to
75 * Seems like a bigger hack than what we have already.
77 * - Point drm_device::dev to the parent of the virtio_device
79 * * Using the wrong device for i2c, framebuffer_alloc and
82 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
83 * will print the wrong information.
85 * We could address the latter issues, by introducing
86 * drm_device::bus_dev, ... which would be used solely for this.
88 * So for the moment keep things as-is, with a bulky comment
89 * for the next person who feels like removing this
90 * drm_dev_set_unique() quirk.
92 snprintf(unique, sizeof(unique), "pci:%s", pname);
93 return drm_dev_set_unique(dev, unique);
96 static int virtio_gpu_probe(struct virtio_device *vdev)
98 struct drm_device *dev;
101 if (vgacon_text_force() && virtio_gpu_modeset == -1)
104 if (virtio_gpu_modeset == 0)
107 dev = drm_dev_alloc(&driver, &vdev->dev);
112 if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
113 ret = virtio_gpu_pci_quirk(dev, vdev);
118 ret = virtio_gpu_init(dev);
122 ret = drm_dev_register(dev, 0);
126 drm_fbdev_generic_setup(vdev->priv, 32);
134 static void virtio_gpu_remove(struct virtio_device *vdev)
136 struct drm_device *dev = vdev->priv;
139 drm_atomic_helper_shutdown(dev);
140 virtio_gpu_deinit(dev);
144 static void virtio_gpu_config_changed(struct virtio_device *vdev)
146 struct drm_device *dev = vdev->priv;
147 struct virtio_gpu_device *vgdev = dev->dev_private;
149 schedule_work(&vgdev->config_changed_work);
152 static struct virtio_device_id id_table[] = {
153 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
157 static unsigned int features[] = {
158 #ifdef __LITTLE_ENDIAN
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.
167 VIRTIO_GPU_F_RESOURCE_UUID,
168 VIRTIO_GPU_F_RESOURCE_BLOB,
170 static 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
181 module_virtio_driver(virtio_gpu_driver);
183 MODULE_DEVICE_TABLE(virtio, id_table);
184 MODULE_DESCRIPTION("Virtio GPU driver");
185 MODULE_LICENSE("GPL and additional rights");
186 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
187 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
188 MODULE_AUTHOR("Alon Levy");
190 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
192 static const 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,
197 .dumb_create = virtio_gpu_mode_dumb_create,
198 .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
200 #if defined(CONFIG_DEBUG_FS)
201 .debugfs_init = virtio_gpu_debugfs_init,
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_import = virtgpu_gem_prime_import,
207 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
209 .gem_create_object = virtio_gpu_create_object,
210 .fops = &virtio_gpu_driver_fops,
212 .ioctls = virtio_gpu_ioctls,
213 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
218 .major = DRIVER_MAJOR,
219 .minor = DRIVER_MINOR,
220 .patchlevel = DRIVER_PATCHLEVEL,
222 .release = virtio_gpu_release,