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};