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>
35 #include "virtgpu_drv.h"
36 static struct drm_driver driver;
38 static int virtio_gpu_modeset = -1;
40 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
41 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
43 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
45 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
46 const char *pname = dev_name(&pdev->dev);
47 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
50 DRM_INFO("pci: %s detected at %s\n",
51 vga ? "virtio-vga" : "virtio-gpu-pci",
55 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
60 * Normally the drm_dev_set_unique() call is done by core DRM.
61 * The following comment covers, why virtio cannot rely on it.
63 * Unlike the other virtual GPU drivers, virtio abstracts the
64 * underlying bus type by using struct virtio_device.
66 * Hence the dev_is_pci() check, used in core DRM, will fail
67 * and the unique returned will be the virtio_device "virtio0",
68 * while a "pci:..." one is required.
70 * A few other ideas were considered:
71 * - Extend the dev_is_pci() check [in drm_set_busid] to
73 * Seems like a bigger hack than what we have already.
75 * - Point drm_device::dev to the parent of the virtio_device
77 * * Using the wrong device for i2c, framebuffer_alloc and
80 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
81 * will print the wrong information.
83 * We could address the latter issues, by introducing
84 * drm_device::bus_dev, ... which would be used solely for this.
86 * So for the moment keep things as-is, with a bulky comment
87 * for the next person who feels like removing this
88 * drm_dev_set_unique() quirk.
90 snprintf(unique, sizeof(unique), "pci:%s", pname);
91 return drm_dev_set_unique(dev, unique);
94 static int virtio_gpu_probe(struct virtio_device *vdev)
96 struct drm_device *dev;
99 if (vgacon_text_force() && virtio_gpu_modeset == -1)
102 if (virtio_gpu_modeset == 0)
105 dev = drm_dev_alloc(&driver, &vdev->dev);
110 if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
111 ret = virtio_gpu_pci_quirk(dev, vdev);
116 ret = virtio_gpu_init(dev);
120 ret = drm_dev_register(dev, 0);
124 drm_fbdev_generic_setup(vdev->priv, 32);
132 static void virtio_gpu_remove(struct virtio_device *vdev)
134 struct drm_device *dev = vdev->priv;
136 drm_dev_unregister(dev);
137 virtio_gpu_deinit(dev);
141 static void virtio_gpu_config_changed(struct virtio_device *vdev)
143 struct drm_device *dev = vdev->priv;
144 struct virtio_gpu_device *vgdev = dev->dev_private;
146 schedule_work(&vgdev->config_changed_work);
149 static struct virtio_device_id id_table[] = {
150 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
154 static unsigned int features[] = {
155 #ifdef __LITTLE_ENDIAN
157 * Gallium command stream send by virgl is native endian.
158 * Because of that we only support little endian guests on
159 * little endian hosts.
165 static struct virtio_driver virtio_gpu_driver = {
166 .feature_table = features,
167 .feature_table_size = ARRAY_SIZE(features),
168 .driver.name = KBUILD_MODNAME,
169 .driver.owner = THIS_MODULE,
170 .id_table = id_table,
171 .probe = virtio_gpu_probe,
172 .remove = virtio_gpu_remove,
173 .config_changed = virtio_gpu_config_changed
176 module_virtio_driver(virtio_gpu_driver);
178 MODULE_DEVICE_TABLE(virtio, id_table);
179 MODULE_DESCRIPTION("Virtio GPU driver");
180 MODULE_LICENSE("GPL and additional rights");
181 MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
182 MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
183 MODULE_AUTHOR("Alon Levy");
185 static const struct file_operations virtio_gpu_driver_fops = {
186 .owner = THIS_MODULE,
188 .mmap = virtio_gpu_mmap,
191 .unlocked_ioctl = drm_ioctl,
192 .release = drm_release,
193 .compat_ioctl = drm_compat_ioctl,
194 .llseek = noop_llseek,
197 static struct drm_driver driver = {
198 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_RENDER | DRIVER_ATOMIC,
199 .open = virtio_gpu_driver_open,
200 .postclose = virtio_gpu_driver_postclose,
202 .dumb_create = virtio_gpu_mode_dumb_create,
203 .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
205 #if defined(CONFIG_DEBUG_FS)
206 .debugfs_init = virtio_gpu_debugfs_init,
208 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
209 .gem_prime_export = drm_gem_prime_export,
210 .gem_prime_import = drm_gem_prime_import,
211 .gem_prime_get_sg_table = virtgpu_gem_prime_get_sg_table,
212 .gem_prime_vmap = virtgpu_gem_prime_vmap,
213 .gem_prime_vunmap = virtgpu_gem_prime_vunmap,
214 .gem_prime_mmap = virtgpu_gem_prime_mmap,
216 .gem_free_object_unlocked = virtio_gpu_gem_free_object,
217 .gem_open_object = virtio_gpu_gem_object_open,
218 .gem_close_object = virtio_gpu_gem_object_close,
219 .fops = &virtio_gpu_driver_fops,
221 .ioctls = virtio_gpu_ioctls,
222 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
227 .major = DRIVER_MAJOR,
228 .minor = DRIVER_MINOR,
229 .patchlevel = DRIVER_PATCHLEVEL,