2 * Copyright (C) 2015 Red Hat, Inc.
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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 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",
59 drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
63 * Normally the drm_dev_set_unique() call is done by core DRM.
64 * The following comment covers, why virtio cannot rely on it.
66 * Unlike the other virtual GPU drivers, virtio abstracts the
67 * underlying bus type by using struct virtio_device.
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.
73 * A few other ideas were considered:
74 * - Extend the dev_is_pci() check [in drm_set_busid] to
76 * Seems like a bigger hack than what we have already.
78 * - Point drm_device::dev to the parent of the virtio_device
80 * * Using the wrong device for i2c, framebuffer_alloc and
83 * * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
84 * will print the wrong information.
86 * We could address the latter issues, by introducing
87 * drm_device::bus_dev, ... which would be used solely for this.
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.
93 snprintf(unique, sizeof(unique), "pci:%s", pname);
94 return drm_dev_set_unique(dev, unique);
97 static int virtio_gpu_probe(struct virtio_device *vdev)
99 struct drm_device *dev;
102 if (vgacon_text_force() && virtio_gpu_modeset == -1)
105 if (virtio_gpu_modeset == 0)
108 dev = drm_dev_alloc(&driver, &vdev->dev);
113 if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
114 ret = virtio_gpu_pci_quirk(dev, vdev);
119 ret = virtio_gpu_init(dev);
123 ret = drm_dev_register(dev, 0);
127 drm_fbdev_generic_setup(vdev->priv, 32);
135 static void virtio_gpu_remove(struct virtio_device *vdev)
137 struct drm_device *dev = vdev->priv;
140 drm_atomic_helper_shutdown(dev);
141 virtio_gpu_deinit(dev);
145 static void virtio_gpu_config_changed(struct virtio_device *vdev)
147 struct drm_device *dev = vdev->priv;
148 struct virtio_gpu_device *vgdev = dev->dev_private;
150 schedule_work(&vgdev->config_changed_work);
153 static struct virtio_device_id id_table[] = {
154 { VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
158 static unsigned int features[] = {
159 #ifdef __LITTLE_ENDIAN
161 * Gallium command stream send by virgl is native endian.
162 * Because of that we only support little endian guests on
163 * little endian hosts.
169 static struct virtio_driver virtio_gpu_driver = {
170 .feature_table = features,
171 .feature_table_size = ARRAY_SIZE(features),
172 .driver.name = KBUILD_MODNAME,
173 .driver.owner = THIS_MODULE,
174 .id_table = id_table,
175 .probe = virtio_gpu_probe,
176 .remove = virtio_gpu_remove,
177 .config_changed = virtio_gpu_config_changed
180 module_virtio_driver(virtio_gpu_driver);
182 MODULE_DEVICE_TABLE(virtio, id_table);
183 MODULE_DESCRIPTION("Virtio GPU driver");
184 MODULE_LICENSE("GPL and additional rights");
187 MODULE_AUTHOR("Alon Levy");
189 DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
191 static struct drm_driver driver = {
192 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
193 .open = virtio_gpu_driver_open,
194 .postclose = virtio_gpu_driver_postclose,
196 .dumb_create = virtio_gpu_mode_dumb_create,
197 .dumb_map_offset = virtio_gpu_mode_dumb_mmap,
199 #if defined(CONFIG_DEBUG_FS)
200 .debugfs_init = virtio_gpu_debugfs_init,
202 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
203 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
204 .gem_prime_mmap = drm_gem_prime_mmap,
205 .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
207 .gem_create_object = virtio_gpu_create_object,
208 .fops = &virtio_gpu_driver_fops,
210 .ioctls = virtio_gpu_ioctls,
211 .num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
216 .major = DRIVER_MAJOR,
217 .minor = DRIVER_MINOR,
218 .patchlevel = DRIVER_PATCHLEVEL,
220 .release = virtio_gpu_release,