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_atomic_helper.h>
 35#include <drm/drm_drv.h>
 36#include <drm/drm_file.h>
 37
 38#include "virtgpu_drv.h"
 39
 40static struct drm_driver driver;
 41
 42static int virtio_gpu_modeset = -1;
 43
 44MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
 45module_param_named(modeset, virtio_gpu_modeset, int, 0400);
 46
 47static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
 48{
 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;
 52	char unique[20];
 53
 54	DRM_INFO("pci: %s detected at %s\n",
 55		 vga ? "virtio-vga" : "virtio-gpu-pci",
 56		 pname);
 57	dev->pdev = pdev;
 58	if (vga)
 59		drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
 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_unplug(dev);
140	drm_atomic_helper_shutdown(dev);
141	virtio_gpu_deinit(dev);
142	drm_dev_put(dev);
143}
144
145static void virtio_gpu_config_changed(struct virtio_device *vdev)
146{
147	struct drm_device *dev = vdev->priv;
148	struct virtio_gpu_device *vgdev = dev->dev_private;
149
150	schedule_work(&vgdev->config_changed_work);
151}
152
153static struct virtio_device_id id_table[] = {
154	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
155	{ 0 },
156};
157
158static unsigned int features[] = {
159#ifdef __LITTLE_ENDIAN
160	/*
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.
164	 */
165	VIRTIO_GPU_F_VIRGL,
166#endif
167	VIRTIO_GPU_F_EDID,
168};
169static 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
178};
179
180module_virtio_driver(virtio_gpu_driver);
181
182MODULE_DEVICE_TABLE(virtio, id_table);
183MODULE_DESCRIPTION("Virtio GPU driver");
184MODULE_LICENSE("GPL and additional rights");
185MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
186MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
187MODULE_AUTHOR("Alon Levy");
188
189DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
190
191static 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,
195
196	.dumb_create = virtio_gpu_mode_dumb_create,
197	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
198
199#if defined(CONFIG_DEBUG_FS)
200	.debugfs_init = virtio_gpu_debugfs_init,
201#endif
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,
206
207	.gem_create_object = virtio_gpu_create_object,
208	.fops = &virtio_gpu_driver_fops,
209
210	.ioctls = virtio_gpu_ioctls,
211	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
212
213	.name = DRIVER_NAME,
214	.desc = DRIVER_DESC,
215	.date = DRIVER_DATE,
216	.major = DRIVER_MAJOR,
217	.minor = DRIVER_MINOR,
218	.patchlevel = DRIVER_PATCHLEVEL,
219
220	.release = virtio_gpu_release,
221};