1 /*
2 * Copyright © 2007 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27
28 #include <fcntl.h>
29 #include <fnmatch.h>
30 #include <sys/stat.h>
31 #include "drmtest.h"
32
33 #define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE
34 #include <libudev.h>
35
is_master(int fd)36 static int is_master(int fd)
37 {
38 drm_client_t client;
39 int ret;
40
41 /* Check that we're the only opener and authed. */
42 client.idx = 0;
43 ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client);
44 assert (ret == 0);
45 if (!client.auth)
46 return 0;
47 client.idx = 1;
48 ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client);
49 if (ret != -1 || errno != EINVAL)
50 return 0;
51
52 return 1;
53 }
54
55 /** Open the first DRM device matching the criteria */
drm_open_matching(const char * pci_glob,int flags)56 int drm_open_matching(const char *pci_glob, int flags)
57 {
58 struct udev *udev;
59 struct udev_enumerate *e;
60 struct udev_device *device, *parent;
61 struct udev_list_entry *entry;
62 const char *pci_id, *path;
63 int i, fd;
64
65 udev = udev_new();
66 if (udev == NULL) {
67 fprintf(stderr, "failed to initialize udev context\n");
68 abort();
69 }
70
71 fd = -1;
72 e = udev_enumerate_new(udev);
73 udev_enumerate_add_match_subsystem(e, "drm");
74 udev_enumerate_scan_devices(e);
75 udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
76 path = udev_list_entry_get_name(entry);
77 device = udev_device_new_from_syspath(udev, path);
78 parent = udev_device_get_parent(device);
79 /* Filter out KMS output devices. */
80 if (strcmp(udev_device_get_subsystem(parent), "pci") != 0)
81 continue;
82 pci_id = udev_device_get_property_value(parent, "PCI_ID");
83 if (fnmatch(pci_glob, pci_id, 0) != 0)
84 continue;
85 fd = open(udev_device_get_devnode(device), O_RDWR);
86 if (fd < 0)
87 continue;
88 if ((flags & DRM_TEST_MASTER) && !is_master(fd)) {
89 close(fd);
90 fd = -1;
91 continue;
92 }
93
94 break;
95 }
96 udev_enumerate_unref(e);
97 udev_unref(udev);
98
99 return fd;
100 }
101
drm_open_any(void)102 int drm_open_any(void)
103 {
104 int fd = drm_open_matching("*:*", 0);
105
106 if (fd < 0) {
107 fprintf(stderr, "failed to open any drm device\n");
108 abort();
109 }
110
111 return fd;
112 }
113
114 /**
115 * Open the first DRM device we can find where we end up being the master.
116 */
drm_open_any_master(void)117 int drm_open_any_master(void)
118 {
119 int fd = drm_open_matching("*:*", DRM_TEST_MASTER);
120
121 if (fd < 0) {
122 fprintf(stderr, "failed to open any drm device\n");
123 abort();
124 }
125
126 return fd;
127
128 }
129