1/*	$NetBSD: drm_pci_busid.c,v 1.3 2022/07/23 08:45:03 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2020 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: drm_pci_busid.c,v 1.3 2022/07/23 08:45:03 riastradh Exp $");
31
32#include <sys/types.h>
33#include <sys/device.h>
34#include <sys/errno.h>
35
36#include <lib/libkern/libkern.h>
37
38#include <dev/pci/pcivar.h>
39
40#include <linux/kernel.h>
41#include <linux/pci.h>
42
43#include <drm/drm_auth.h>
44#include <drm/drm_device.h>
45#include "../dist/drm/drm_internal.h"
46
47int
48drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
49{
50	const struct pci_attach_args *const pa = &dev->pdev->pd_pa;
51
52	KASSERT(dev_is_pci(dev->dev));
53
54	master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
55	    device_unit(device_parent(dev->dev)),
56	    pa->pa_bus, pa->pa_device, pa->pa_function);
57	if (master->unique == NULL)
58		return -ENOMEM;
59	master->unique_len = strlen(master->unique);
60
61	return 0;
62}
63