1/*
 2 * Copyright (C) 2015 Red Hat, Inc.
 3 * All Rights Reserved.
 4 *
 5 * Permission is hereby granted, free of charge, to any person obtaining
 6 * a copy of this software and associated documentation files (the
 7 * "Software"), to deal in the Software without restriction, including
 8 * without limitation the rights to use, copy, modify, merge, publish,
 9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26#include <linux/pci.h>
27#include <drm/drm_fb_helper.h>
28
29#include "virtgpu_drv.h"
30
31static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
32{
33	struct apertures_struct *ap;
34	bool primary;
35
36	ap = alloc_apertures(1);
37	if (!ap)
38		return;
39
40	ap->ranges[0].base = pci_resource_start(pci_dev, 0);
41	ap->ranges[0].size = pci_resource_len(pci_dev, 0);
42
43	primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
44		& IORESOURCE_ROM_SHADOW;
45
46	drm_fb_helper_remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
47
48	kfree(ap);
49}
50
51int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
52{
53	struct drm_device *dev;
54	int ret;
55
56	dev = drm_dev_alloc(driver, &vdev->dev);
57	if (IS_ERR(dev))
58		return PTR_ERR(dev);
59	vdev->priv = dev;
60
61	if (strcmp(vdev->dev.parent->bus->name, "pci") == 0) {
62		struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
63		const char *pname = dev_name(&pdev->dev);
64		bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
65		char unique[20];
66
67		DRM_INFO("pci: %s detected at %s\n",
68			 vga ? "virtio-vga" : "virtio-gpu-pci",
69			 pname);
70		dev->pdev = pdev;
71		if (vga)
72			virtio_pci_kick_out_firmware_fb(pdev);
73
74		snprintf(unique, sizeof(unique), "pci:%s", pname);
75		ret = drm_dev_set_unique(dev, unique);
76		if (ret)
77			goto err_free;
78
79	}
80
81	ret = drm_dev_register(dev, 0);
82	if (ret)
83		goto err_free;
84
85	return 0;
86
87err_free:
88	drm_dev_unref(dev);
89	return ret;
90}