virtgpu_drv.c

  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/vgaarb.h>
 34#include <linux/wait.h>
 35
 36#include <drm/clients/drm_client_setup.h>
 37#include <drm/drm.h>
 38#include <drm/drm_atomic_helper.h>
 39#include <drm/drm_drv.h>
 40#include <drm/drm_fbdev_shmem.h>
 41#include <drm/drm_file.h>
 42#include <drm/drm_print.h>
 43
 44#include "virtgpu_drv.h"
 45
 46#define PCI_DEVICE_ID_VIRTIO_GPU 0x1050
 47
 48static const struct drm_driver driver;
 49
 50static int virtio_gpu_modeset = -1;
 51
 52MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
 53module_param_named(modeset, virtio_gpu_modeset, int, 0400);
 54
 55static int virtio_gpu_pci_quirk(struct drm_device *dev)
 56{
 57	struct pci_dev *pdev = to_pci_dev(dev->dev);
 58	const char *pname = dev_name(&pdev->dev);
 59	bool vga = pci_is_vga(pdev);
 60	int ret;
 61
 62	DRM_INFO("pci: %s detected at %s\n",
 63		 vga ? "virtio-vga" : "virtio-gpu-pci",
 64		 pname);
 65	if (vga) {
 66		ret = aperture_remove_conflicting_pci_devices(pdev, driver.name);
 67		if (ret)
 68			return ret;
 69	}
 70
 71	return 0;
 72}
 73
 74static int virtio_gpu_probe(struct virtio_device *vdev)
 75{
 76	struct drm_device *dev;
 77	int ret;
 78
 79	if (drm_firmware_drivers_only() && virtio_gpu_modeset == -1)
 80		return -EINVAL;
 81
 82	if (virtio_gpu_modeset == 0)
 83		return -EINVAL;
 84
 85	/*
 86	 * The virtio-gpu device is a virtual device that doesn't have DMA
 87	 * ops assigned to it, nor DMA mask set and etc. Its parent device
 88	 * is actual GPU device we want to use it for the DRM's device in
 89	 * order to benefit from using generic DRM APIs.
 90	 */
 91	dev = drm_dev_alloc(&driver, vdev->dev.parent);
 92	if (IS_ERR(dev))
 93		return PTR_ERR(dev);
 94	vdev->priv = dev;
 95
 96	if (dev_is_pci(vdev->dev.parent)) {
 97		ret = virtio_gpu_pci_quirk(dev);
 98		if (ret)
 99			goto err_free;
100	}
101
102	dma_set_max_seg_size(dev->dev, dma_max_mapping_size(dev->dev) ?: UINT_MAX);
103	ret = virtio_gpu_init(vdev, dev);
104	if (ret)
105		goto err_free;
106
107	ret = drm_dev_register(dev, 0);
108	if (ret)
109		goto err_deinit;
110
111	drm_client_setup(vdev->priv, NULL);
112
113	return 0;
114
115err_deinit:
116	virtio_gpu_deinit(dev);
117err_free:
118	drm_dev_put(dev);
119	return ret;
120}
121
122static void virtio_gpu_remove(struct virtio_device *vdev)
123{
124	struct drm_device *dev = vdev->priv;
125
126	drm_dev_unplug(dev);
127	drm_atomic_helper_shutdown(dev);
128	virtio_gpu_deinit(dev);
129	drm_dev_put(dev);
130}
131
132static void virtio_gpu_shutdown(struct virtio_device *vdev)
133{
134	struct drm_device *dev = vdev->priv;
135
136	/* stop talking to the device */
137	drm_dev_unplug(dev);
138}
139
140static void virtio_gpu_config_changed(struct virtio_device *vdev)
141{
142	struct drm_device *dev = vdev->priv;
143	struct virtio_gpu_device *vgdev = dev->dev_private;
144
145	schedule_work(&vgdev->config_changed_work);
146}
147
148static struct virtio_device_id id_table[] = {
149	{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
150	{ 0 },
151};
152
153static unsigned int features[] = {
154#ifdef __LITTLE_ENDIAN
155	/*
156	 * Gallium command stream send by virgl is native endian.
157	 * Because of that we only support little endian guests on
158	 * little endian hosts.
159	 */
160	VIRTIO_GPU_F_VIRGL,
161#endif
162	VIRTIO_GPU_F_EDID,
163	VIRTIO_GPU_F_RESOURCE_UUID,
164	VIRTIO_GPU_F_RESOURCE_BLOB,
165	VIRTIO_GPU_F_CONTEXT_INIT,
166};
167static struct virtio_driver virtio_gpu_driver = {
168	.feature_table = features,
169	.feature_table_size = ARRAY_SIZE(features),
170	.driver.name = KBUILD_MODNAME,
171	.id_table = id_table,
172	.probe = virtio_gpu_probe,
173	.remove = virtio_gpu_remove,
174	.shutdown = virtio_gpu_shutdown,
175	.config_changed = virtio_gpu_config_changed
176};
177
178static int __init virtio_gpu_driver_init(void)
179{
180	struct pci_dev *pdev;
181	int ret;
182
183	pdev = pci_get_device(PCI_VENDOR_ID_REDHAT_QUMRANET,
184			      PCI_DEVICE_ID_VIRTIO_GPU,
185			      NULL);
186	if (pdev && pci_is_vga(pdev)) {
187		ret = vga_get_interruptible(pdev,
188			VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
189		if (ret) {
190			pci_dev_put(pdev);
191			return ret;
192		}
193	}
194
195	ret = register_virtio_driver(&virtio_gpu_driver);
196
197	if (pdev) {
198		if (pci_is_vga(pdev))
199			vga_put(pdev,
200				VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
201
202		pci_dev_put(pdev);
203	}
204
205	return ret;
206}
207
208static void __exit virtio_gpu_driver_exit(void)
209{
210	unregister_virtio_driver(&virtio_gpu_driver);
211}
212
213module_init(virtio_gpu_driver_init);
214module_exit(virtio_gpu_driver_exit);
215
216MODULE_DEVICE_TABLE(virtio, id_table);
217MODULE_DESCRIPTION("Virtio GPU driver");
218MODULE_LICENSE("GPL and additional rights");
219MODULE_AUTHOR("Dave Airlie <airlied@redhat.com>");
220MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
221MODULE_AUTHOR("Alon Levy");
222
223DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
224
225static const struct drm_driver driver = {
226	/*
227	 * If KMS is disabled DRIVER_MODESET and DRIVER_ATOMIC are masked
228	 * out via drm_device::driver_features:
229	 */
230	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC |
231			   DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT,
232	.open = virtio_gpu_driver_open,
233	.postclose = virtio_gpu_driver_postclose,
234
235	.dumb_create = virtio_gpu_mode_dumb_create,
236
237	DRM_FBDEV_SHMEM_DRIVER_OPS,
238
239#if defined(CONFIG_DEBUG_FS)
240	.debugfs_init = virtio_gpu_debugfs_init,
241#endif
242	.gem_prime_import = virtgpu_gem_prime_import,
243	.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
244
245	.gem_create_object = virtio_gpu_create_object,
246	.fops = &virtio_gpu_driver_fops,
247
248	.ioctls = virtio_gpu_ioctls,
249	.num_ioctls = DRM_VIRTIO_NUM_IOCTLS,
250
251	.name = DRIVER_NAME,
252	.desc = DRIVER_DESC,
253	.major = DRIVER_MAJOR,
254	.minor = DRIVER_MINOR,
255	.patchlevel = DRIVER_PATCHLEVEL,
256
257	.release = virtio_gpu_release,
258};