2 * Copyright (C) 2015 Red Hat, Inc.
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14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice (including the next
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20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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29 #include <linux/module.h>
30 #include <linux/console.h>
31 #include <linux/pci.h>
32 #include <linux/poll.h>
33 #include <linux/wait.h>
36 #include <drm/drm_aperture.h>
37 #include <drm/drm_atomic_helper.h>
38 #include <drm/drm_drv.h>
39 #include <drm/drm_file.h>
41 #include "virtgpu_drv.h"
43 static const struct drm_driver driver;
45 static int virtio_gpu_modeset = -1;
47 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
48 module_param_named(modeset, virtio_gpu_modeset, int, 0400);
50 static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
52 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
53 const char *pname = dev_name(&pdev->dev);
54 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
58 DRM_INFO("pci: %s detected at %s\n",
59 vga ? "virtio-vga" : "virtio-gpu-pci",
62 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver);
68 * Normally the drm_dev_set_unique() call is done by core DRM.
69 * The following comment covers, why virtio cannot rely on it.
71 * Unlike the other virtual GPU drivers, virtio abstracts the
72 * underlying bus type by using struct virtio_device.
74 * Hence the dev_is_pci() check, used in core DRM, will fail
75 * and the unique returned will be the virtio_device "virtio0",
76 * while a "pci:..." one is required.
78 * A few other ideas were considered:
79 * - Extend the dev_is_pci() check [in drm_set_busid] to
81 * Seems like a bigger hack than what we have already.
83 * - Point drm_device::dev to the parent of the virtio_device
85 * * Using the wrong device for i2c, framebuffer_alloc and
88 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
89 * will print the wrong information.
91 * We could address the latter issues, by introducing
92 * drm_device::bus_dev, ... which would be used solely for this.
94 * So for the moment keep things as-is, with a bulky comment
95 * for the next person who feels like removing this
96 * drm_dev_set_unique() quirk.
98 snprintf(unique, sizeof(unique), "pci:%s", pname);
99 return drm_dev_set_unique(dev, unique);
102 static int virtio_gpu_probe(struct virtio_device *vdev)
104 struct drm_device *dev;
107 if (vgacon_text_force() && virtio_gpu_modeset == -1)
110 if (virtio_gpu_modeset == 0)
113 dev = drm_dev_alloc(&driver, &vdev->dev);
118 if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
119 ret = virtio_gpu_pci_quirk(dev, vdev);
124 ret = virtio_gpu_init(dev);
128 ret = drm_dev_register(dev, 0);
132 drm_fbdev_generic_setup(vdev->priv, 32);
136 virtio_gpu_deinit(dev);
142 static void virtio_gpu_remove(struct virtio_device *vdev)
144 struct drm_device *dev = vdev->priv;
147 drm_atomic_helper_shutdown(dev);
148 virtio_gpu_deinit(dev);
152 static void virtio_gpu_config_changed(struct virtio_device *vdev)
154 struct drm_device *dev = vdev->priv;
155 struct virtio_gpu_device *vgdev = dev->dev_private;
157 schedule_work(&vgdev->config_changed_work);
160 static __poll_t virtio_gpu_poll(struct file *filp,
161 struct poll_table_struct *wait)
163 struct drm_file *drm_file = filp->private_data;
164 struct virtio_gpu_fpriv *vfpriv = drm_file->driver_priv;
165 struct drm_device *dev = drm_file->minor->dev;
166 struct virtio_gpu_device *vgdev = dev->dev_private;
167 struct drm_pending_event *e = NULL;
170 if (!vgdev->has_virgl_3d || !vfpriv || !vfpriv->ring_idx_mask)
171 return drm_poll(filp, wait);
173 poll_wait(filp, &drm_file->event_wait, wait);
175 if (!list_empty(&drm_file->event_list)) {
176 spin_lock_irq(&dev->event_lock);
177 e = list_first_entry(&drm_file->event_list,
178 struct drm_pending_event, link);
179 drm_file->event_space += e->event->length;
181 spin_unlock_irq(&dev->event_lock);
184 mask |= EPOLLIN | EPOLLRDNORM;
190 static struct virtio_device_id id_table[] = {
191 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
195 static unsigned int features[] = {
196 #ifdef __LITTLE_ENDIAN
198 * Gallium command stream send by virgl is native endian.
199 * Because of that we only support little endian guests on
200 * little endian hosts.
205 VIRTIO_GPU_F_RESOURCE_UUID,
206 VIRTIO_GPU_F_RESOURCE_BLOB,
207 VIRTIO_GPU_F_CONTEXT_INIT,
209 static struct virtio_driver virtio_gpu_driver = {
210 .feature_table = features,
211 .feature_table_size = ARRAY_SIZE(features),
212 .driver.name = KBUILD_MODNAME,
213 .driver.owner = THIS_MODULE,
214 .id_table = id_table,
215 .probe = virtio_gpu_probe,
216 .remove = virtio_gpu_remove,
217 .config_changed = virtio_gpu_config_changed
220 module_virtio_driver(virtio_gpu_driver);
222 MODULE_DEVICE_TABLE(virtio, id_table);
223 MODULE_DESCRIPTION("Virtio GPU driver");
224 MODULE_LICENSE("GPL and additional rights");
227 MODULE_AUTHOR("Alon Levy");
229 static const struct file_operations virtio_gpu_driver_fops = {
230 .owner = THIS_MODULE,
232 .release = drm_release,
233 .unlocked_ioctl = drm_ioctl,
234 .compat_ioctl = drm_compat_ioctl,
235 .poll = virtio_gpu_poll,
237 .llseek = noop_llseek,
241 static const struct drm_driver driver = {
242 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
243 .open = virtio_gpu_driver_open,
244 .postclose = virtio_gpu_driver_postclose,
246 .dumb_create = virtio_gpu_mode_dumb_create,
247 .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
249 #if defined(CONFIG_DEBUG_FS)
250 .debugfs_init = virtio_gpu_debugfs_init,
252 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
253 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
254 .gem_prime_mmap = drm_gem_prime_mmap,
255 .gem_prime_import = virtgpu_gem_prime_import,
256 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
258 .gem_create_object = virtio_gpu_create_object,
259 .fops = &virtio_gpu_driver_fops,
261 .ioctls = virtio_gpu_ioctls,
262 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
267 .major = DRIVER_MAJOR,
268 .minor = DRIVER_MINOR,
269 .patchlevel = DRIVER_PATCHLEVEL,
271 .release = virtio_gpu_release,