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_aperture.h>
 35#include <drm/drm_atomic_helper.h>
 36#include <drm/drm_drv.h>
 37#include <drm/drm_file.h>
 38
 39#include "virtgpu_drv.h"
 40
 41static const struct drm_driver driver;
 42
 43static int virtio_gpu_modeset = -1;
 44
 45MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
 46module_param_named(modeset, virtio_gpu_modeset, int, 0400);
 47
 48static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vdev)
 49{
 50	struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
 51	const char *pname = dev_name(&pdev->dev);
 52	bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
 53	char unique[20];
 54	int ret;
 55
 56	DRM_INFO("pci: %s detected at %s\n",
 57		 vga ? "virtio-vga" : "virtio-gpu-pci",
 58		 pname);
 59	if (vga) {
 60		ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, "virtiodrmfb");
 61		if (ret)
 62			return ret;
 63	}
 64
 65	/*
 66	 * Normally the drm_dev_set_unique() call is done by core DRM.
 67	 * The following comment covers, why virtio cannot rely on it.
 68	 *
 69	 * Unlike the other virtual GPU drivers, virtio abstracts the
 70	 * underlying bus type by using struct virtio_device.
 71	 *
 72	 * Hence the dev_is_pci() check, used in core DRM, will fail
 73	 * and the unique returned will be the virtio_device "virtio0",
 74	 * while a "pci:..." one is required.
 75	 *
 76	 * A few other ideas were considered:
 77	 * - Extend the dev_is_pci() check [in drm_set_busid] to
 78	 *   consider virtio.
 79	 *   Seems like a bigger hack than what we have already.
 80	 *
 81	 * - Point drm_device::dev to the parent of the virtio_device
 82	 *   Semantic changes:
 83	 *   * Using the wrong device for i2c, framebuffer_alloc and
 84	 *     prime import.
 85	 *   Visual changes:
 86	 *   * Helpers such as DRM_DEV_ERROR, dev_info, drm_printer,
 87	 *     will print the wrong information.
 88	 *
 89	 * We could address the latter issues, by introducing
 90	 * drm_device::bus_dev, ... which would be used solely for this.
 91	 *
 92	 * So for the moment keep things as-is, with a bulky comment
 93	 * for the next person who feels like removing this
 94	 * drm_dev_set_unique() quirk.
 95	 */
 96	snprintf(unique, sizeof(unique), "pci:%s", pname);
 97	return drm_dev_set_unique(dev, unique);
 98}
 99
100static int virtio_gpu_probe(struct virtio_device *vdev)
101{
102	struct drm_device *dev;
103	int ret;
104
105	if (vgacon_text_force() && virtio_gpu_modeset == -1)
106		return -EINVAL;
107
108	if (virtio_gpu_modeset == 0)
109		return -EINVAL;
110
111	dev = drm_dev_alloc(&driver, &vdev->dev);
112	if (IS_ERR(dev))
113		return PTR_ERR(dev);
114	vdev->priv = dev;
115
116	if (!strcmp(vdev->dev.parent->bus->name, "pci")) {
117		ret = virtio_gpu_pci_quirk(dev, vdev);
118		if (ret)
119			goto err_free;
120	}
121
122	ret = virtio_gpu_init(dev);
123	if (ret)
124		goto err_free;
125
126	ret = drm_dev_register(dev, 0);
127	if (ret)
128		goto err_deinit;
129
130	drm_fbdev_generic_setup(vdev->priv, 32);
131	return 0;
132
133err_deinit:
134	virtio_gpu_deinit(dev);
135err_free:
136	drm_dev_put(dev);
137	return ret;
138}
139
140static void virtio_gpu_remove(struct virtio_device *vdev)
141{
142	struct drm_device *dev = vdev->priv;
143
144	drm_dev_unplug(dev);
145	drm_atomic_helper_shutdown(dev);
146	virtio_gpu_deinit(dev);
147	drm_dev_put(dev);
148}
149
150static void virtio_gpu_config_changed(struct virtio_device *vdev)
151{
152	struct drm_device *dev = vdev->priv;
153	struct virtio_gpu_device *vgdev = dev->dev_private;
154
155	schedule_work(&vgdev->config_changed_work);
156}
157
158static struct virtio_device_id id_table[] = {
159	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
160	{ 0 },
161};
162
163static unsigned int features[] = {
164#ifdef __LITTLE_ENDIAN
165	/*
166	 * Gallium command stream send by virgl is native endian.
167	 * Because of that we only support little endian guests on
168	 * little endian hosts.
169	 */
170	VIRTIO_GPU_F_VIRGL,
171#endif
172	VIRTIO_GPU_F_EDID,
173	VIRTIO_GPU_F_RESOURCE_UUID,
174	VIRTIO_GPU_F_RESOURCE_BLOB,
175};
176static struct virtio_driver virtio_gpu_driver = {
177	.feature_table = features,
178	.feature_table_size = ARRAY_SIZE(features),
179	.driver.name = KBUILD_MODNAME,
180	.driver.owner = THIS_MODULE,
181	.id_table = id_table,
182	.probe = virtio_gpu_probe,
183	.remove = virtio_gpu_remove,
184	.config_changed = virtio_gpu_config_changed
185};
186
187module_virtio_driver(virtio_gpu_driver);
188
189MODULE_DEVICE_TABLE(virtio, id_table);
190MODULE_DESCRIPTION("Virtio GPU driver");
191MODULE_LICENSE("GPL and additional rights");
192MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
193MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
194MODULE_AUTHOR("Alon Levy");
195
196DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
197
198static const struct drm_driver driver = {
199	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
200	.open = virtio_gpu_driver_open,
201	.postclose = virtio_gpu_driver_postclose,
202
203	.dumb_create = virtio_gpu_mode_dumb_create,
204	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
205
206#if defined(CONFIG_DEBUG_FS)
207	.debugfs_init = virtio_gpu_debugfs_init,
208#endif
209	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
210	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
211	.gem_prime_mmap = drm_gem_prime_mmap,
212	.gem_prime_import = virtgpu_gem_prime_import,
213	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
214
215	.gem_create_object = virtio_gpu_create_object,
216	.fops = &virtio_gpu_driver_fops,
217
218	.ioctls = virtio_gpu_ioctls,
219	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
220
221	.name = DRIVER_NAME,
222	.desc = DRIVER_DESC,
223	.date = DRIVER_DATE,
224	.major = DRIVER_MAJOR,
225	.minor = DRIVER_MINOR,
226	.patchlevel = DRIVER_PATCHLEVEL,
227
228	.release = virtio_gpu_release,
229};