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/pci.h>
 31#include <linux/poll.h>
 32#include <linux/wait.h>
 33
 34#include <drm/drm.h>
 35#include <drm/drm_aperture.h>
 36#include <drm/drm_atomic_helper.h>
 37#include <drm/drm_drv.h>
 38#include <drm/drm_fbdev_generic.h>
 39#include <drm/drm_file.h>
 40
 41#include "virtgpu_drv.h"
 42
 43static const struct drm_driver driver;
 44
 45static int virtio_gpu_modeset = -1;
 46
 47MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
 48module_param_named(modeset, virtio_gpu_modeset, int, 0400);
 49
 50static int virtio_gpu_pci_quirk(struct drm_device *dev)
 51{
 52	struct pci_dev *pdev = to_pci_dev(dev->dev);
 53	const char *pname = dev_name(&pdev->dev);
 54	bool vga = pci_is_vga(pdev);
 55	int ret;
 56
 57	DRM_INFO("pci: %s detected at %s\n",
 58		 vga ? "virtio-vga" : "virtio-gpu-pci",
 59		 pname);
 60	if (vga) {
 61		ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver);
 62		if (ret)
 63			return ret;
 64	}
 65
 66	return 0;
 67}
 68
 69static int virtio_gpu_probe(struct virtio_device *vdev)
 70{
 71	struct drm_device *dev;
 72	int ret;
 73
 74	if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1)
 75		return -EINVAL;
 76
 77	if (virtio_gpu_modeset == 0)
 78		return -EINVAL;
 79
 80	/*
 81	 * The virtio-gpu device is a virtual device that doesn't have DMA
 82	 * ops assigned to it, nor DMA mask set and etc. Its parent device
 83	 * is actual GPU device we want to use it for the DRM's device in
 84	 * order to benefit from using generic DRM APIs.
 85	 */
 86	dev = drm_dev_alloc(&driver, vdev->dev.parent);
 87	if (IS_ERR(dev))
 88		return PTR_ERR(dev);
 89	vdev->priv = dev;
 90
 91	if (dev_is_pci(vdev->dev.parent)) {
 92		ret = virtio_gpu_pci_quirk(dev);
 93		if (ret)
 94			goto err_free;
 95	}
 96
 97	dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX);
 98	ret = virtio_gpu_init(vdev, dev);
 99	if (ret)
100		goto err_free;
101
102	ret = drm_dev_register(dev, 0);
103	if (ret)
104		goto err_deinit;
105
106	drm_fbdev_generic_setup(vdev->priv, 32);
107	return 0;
108
109err_deinit:
110	virtio_gpu_deinit(dev);
111err_free:
112	drm_dev_put(dev);
113	return ret;
114}
115
116static void virtio_gpu_remove(struct virtio_device *vdev)
117{
118	struct drm_device *dev = vdev->priv;
119
120	drm_dev_unplug(dev);
121	drm_atomic_helper_shutdown(dev);
122	virtio_gpu_deinit(dev);
123	drm_dev_put(dev);
124}
125
126static void virtio_gpu_config_changed(struct virtio_device *vdev)
127{
128	struct drm_device *dev = vdev->priv;
129	struct virtio_gpu_device *vgdev = dev->dev_private;
130
131	schedule_work(&vgdev->config_changed_work);
132}
133
134static struct virtio_device_id id_table[] = {
135	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
136	{ 0 },
137};
138
139static unsigned int features[] = {
140#ifdef __LITTLE_ENDIAN
141	/*
142	 * Gallium command stream send by virgl is native endian.
143	 * Because of that we only support little endian guests on
144	 * little endian hosts.
145	 */
146	VIRTIO_GPU_F_VIRGL,
147#endif
148	VIRTIO_GPU_F_EDID,
149	VIRTIO_GPU_F_RESOURCE_UUID,
150	VIRTIO_GPU_F_RESOURCE_BLOB,
151	VIRTIO_GPU_F_CONTEXT_INIT,
152};
153static struct virtio_driver virtio_gpu_driver = {
154	.feature_table = features,
155	.feature_table_size = ARRAY_SIZE(features),
156	.driver.name = KBUILD_MODNAME,
157	.driver.owner = THIS_MODULE,
158	.id_table = id_table,
159	.probe = virtio_gpu_probe,
160	.remove = virtio_gpu_remove,
161	.config_changed = virtio_gpu_config_changed
162};
163
164module_virtio_driver(virtio_gpu_driver);
165
166MODULE_DEVICE_TABLE(virtio, id_table);
167MODULE_DESCRIPTION("Virtio GPU driver");
168MODULE_LICENSE("GPL and additional rights");
169MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
170MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
171MODULE_AUTHOR("Alon Levy");
172
173DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
174
175static const struct drm_driver driver = {
176	/*
177	 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked
178	 * out via drm_device::driver_features:
179	 */
180	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC |
181			   DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT,
182	.open = virtio_gpu_driver_open,
183	.postclose = virtio_gpu_driver_postclose,
184
185	.dumb_create = virtio_gpu_mode_dumb_create,
186	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
187
188#if defined(CONFIG_DEBUG_FS)
189	.debugfs_init = virtio_gpu_debugfs_init,
190#endif
191	.gem_prime_import = virtgpu_gem_prime_import,
192	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
193
194	.gem_create_object = virtio_gpu_create_object,
195	.fops = &virtio_gpu_driver_fops,
196
197	.ioctls = virtio_gpu_ioctls,
198	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
199
200	.name = DRIVER_NAME,
201	.desc = DRIVER_DESC,
202	.date = DRIVER_DATE,
203	.major = DRIVER_MAJOR,
204	.minor = DRIVER_MINOR,
205	.patchlevel = DRIVER_PATCHLEVEL,
206
207	.release = virtio_gpu_release,
208};