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/aperture.h>
 30#include <linux/module.h>
 31#include <linux/pci.h>
 32#include <linux/poll.h>
 33#include <linux/wait.h>
 34
 35#include <drm/drm.h>
 36#include <drm/drm_atomic_helper.h>
 37#include <drm/drm_client_setup.h>
 38#include <drm/drm_drv.h>
 39#include <drm/drm_fbdev_shmem.h>
 40#include <drm/drm_file.h>
 41
 42#include "virtgpu_drv.h"
 43
 44static const struct drm_driver driver;
 45
 46static int virtio_gpu_modeset = -1;
 47
 48MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
 49module_param_named(modeset, virtio_gpu_modeset, int, 0400);
 50
 51static int virtio_gpu_pci_quirk(struct drm_device *dev)
 52{
 53	struct pci_dev *pdev = to_pci_dev(dev->dev);
 54	const char *pname = dev_name(&pdev->dev);
 55	bool vga = pci_is_vga(pdev);
 56	int ret;
 57
 58	DRM_INFO("pci: %s detected at %s\n",
 59		 vga ? "virtio-vga" : "virtio-gpu-pci",
 60		 pname);
 61	if (vga) {
 62		ret = aperture_remove_conflicting_pci_devices(pdev, driver.name);
 63		if (ret)
 64			return ret;
 65	}
 66
 67	return 0;
 68}
 69
 70static int virtio_gpu_probe(struct virtio_device *vdev)
 71{
 72	struct drm_device *dev;
 73	int ret;
 74
 75	if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1)
 76		return -EINVAL;
 77
 78	if (virtio_gpu_modeset == 0)
 79		return -EINVAL;
 80
 81	/*
 82	 * The virtio-gpu device is a virtual device that doesn't have DMA
 83	 * ops assigned to it, nor DMA mask set and etc. Its parent device
 84	 * is actual GPU device we want to use it for the DRM's device in
 85	 * order to benefit from using generic DRM APIs.
 86	 */
 87	dev = drm_dev_alloc(&driver, vdev->dev.parent);
 88	if (IS_ERR(dev))
 89		return PTR_ERR(dev);
 90	vdev->priv = dev;
 91
 92	if (dev_is_pci(vdev->dev.parent)) {
 93		ret = virtio_gpu_pci_quirk(dev);
 94		if (ret)
 95			goto err_free;
 96	}
 97
 98	dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX);
 99	ret = virtio_gpu_init(vdev, dev);
100	if (ret)
101		goto err_free;
102
103	ret = drm_dev_register(dev, 0);
104	if (ret)
105		goto err_deinit;
106
107	drm_client_setup(vdev->priv, NULL);
108
109	return 0;
110
111err_deinit:
112	virtio_gpu_deinit(dev);
113err_free:
114	drm_dev_put(dev);
115	return ret;
116}
117
118static void virtio_gpu_remove(struct virtio_device *vdev)
119{
120	struct drm_device *dev = vdev->priv;
121
122	drm_dev_unplug(dev);
123	drm_atomic_helper_shutdown(dev);
124	virtio_gpu_deinit(dev);
125	drm_dev_put(dev);
126}
127
128static void virtio_gpu_config_changed(struct virtio_device *vdev)
129{
130	struct drm_device *dev = vdev->priv;
131	struct virtio_gpu_device *vgdev = dev->dev_private;
132
133	schedule_work(&vgdev->config_changed_work);
134}
135
136static struct virtio_device_id id_table[] = {
137	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
138	{ 0 },
139};
140
141static unsigned int features[] = {
142#ifdef __LITTLE_ENDIAN
143	/*
144	 * Gallium command stream send by virgl is native endian.
145	 * Because of that we only support little endian guests on
146	 * little endian hosts.
147	 */
148	VIRTIO_GPU_F_VIRGL,
149#endif
150	VIRTIO_GPU_F_EDID,
151	VIRTIO_GPU_F_RESOURCE_UUID,
152	VIRTIO_GPU_F_RESOURCE_BLOB,
153	VIRTIO_GPU_F_CONTEXT_INIT,
154};
155static struct virtio_driver virtio_gpu_driver = {
156	.feature_table = features,
157	.feature_table_size = ARRAY_SIZE(features),
158	.driver.name = KBUILD_MODNAME,
159	.id_table = id_table,
160	.probe = virtio_gpu_probe,
161	.remove = virtio_gpu_remove,
162	.config_changed = virtio_gpu_config_changed
163};
164
165module_virtio_driver(virtio_gpu_driver);
166
167MODULE_DEVICE_TABLE(virtio, id_table);
168MODULE_DESCRIPTION("Virtio GPU driver");
169MODULE_LICENSE("GPL and additional rights");
170MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
171MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
172MODULE_AUTHOR("Alon Levy");
173
174DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
175
176static const struct drm_driver driver = {
177	/*
178	 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked
179	 * out via drm_device::driver_features:
180	 */
181	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC |
182			   DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT,
183	.open = virtio_gpu_driver_open,
184	.postclose = virtio_gpu_driver_postclose,
185
186	.dumb_create = virtio_gpu_mode_dumb_create,
187	.dumb_map_offset = virtio_gpu_mode_dumb_mmap,
188
189	DRM_FBDEV_SHMEM_DRIVER_OPS,
190
191#if defined(CONFIG_DEBUG_FS)
192	.debugfs_init = virtio_gpu_debugfs_init,
193#endif
194	.gem_prime_import = virtgpu_gem_prime_import,
195	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
196
197	.gem_create_object = virtio_gpu_create_object,
198	.fops = &virtio_gpu_driver_fops,
199
200	.ioctls = virtio_gpu_ioctls,
201	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
202
203	.name = DRIVER_NAME,
204	.desc = DRIVER_DESC,
205	.date = DRIVER_DATE,
206	.major = DRIVER_MAJOR,
207	.minor = DRIVER_MINOR,
208	.patchlevel = DRIVER_PATCHLEVEL,
209
210	.release = virtio_gpu_release,
211};