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 (at) anholt.net> 25 * 26 */ 27 28 #include <string.h> 29 #include <fcntl.h> 30 #include <fnmatch.h> 31 #include <sys/stat.h> 32 #include <sys/ioctl.h> 33 #include "drmtest.h" 34 35 #define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE 36 #include <libudev.h> 37 38 static int is_master(int fd) 39 { 40 drm_client_t client; 41 int ret; 42 43 /* Check that we're the only opener and authed. */ 44 client.idx = 0; 45 ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client); 46 assert (ret == 0); 47 if (!client.auth) 48 return 0; 49 client.idx = 1; 50 ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client); 51 if (ret != -1 || errno != EINVAL) 52 return 0; 53 54 return 1; 55 } 56 57 /** Open the first DRM device matching the criteria */ 58 int drm_open_matching(const char *pci_glob, int flags) 59 { 60 struct udev *udev; 61 struct udev_enumerate *e; 62 struct udev_device *device, *parent; 63 struct udev_list_entry *entry; 64 const char *pci_id, *path; 65 const char *usub, *dnode; 66 int fd; 67 68 udev = udev_new(); 69 if (udev == NULL) { 70 fprintf(stderr, "failed to initialize udev context\n"); 71 abort(); 72 } 73 74 fd = -1; 75 e = udev_enumerate_new(udev); 76 udev_enumerate_add_match_subsystem(e, "drm"); 77 udev_enumerate_scan_devices(e); 78 udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) { 79 path = udev_list_entry_get_name(entry); 80 device = udev_device_new_from_syspath(udev, path); 81 parent = udev_device_get_parent(device); 82 usub = udev_device_get_subsystem(parent); 83 /* Filter out KMS output devices. */ 84 if (!usub || (strcmp(usub, "pci") != 0)) 85 continue; 86 pci_id = udev_device_get_property_value(parent, "PCI_ID"); 87 if (fnmatch(pci_glob, pci_id, 0) != 0) 88 continue; 89 dnode = udev_device_get_devnode(device); 90 if (strstr(dnode, "control")) 91 continue; 92 fd = open(dnode, O_RDWR); 93 if (fd < 0) 94 continue; 95 if ((flags & DRM_TEST_MASTER) && !is_master(fd)) { 96 close(fd); 97 fd = -1; 98 continue; 99 } 100 101 break; 102 } 103 udev_enumerate_unref(e); 104 udev_unref(udev); 105 106 return fd; 107 } 108 109 int drm_open_any(void) 110 { 111 int fd = drm_open_matching("*:*", 0); 112 113 if (fd < 0) { 114 fprintf(stderr, "failed to open any drm device\n"); 115 exit(0); 116 } 117 118 return fd; 119 } 120 121 /** 122 * Open the first DRM device we can find where we end up being the master. 123 */ 124 int drm_open_any_master(void) 125 { 126 int fd = drm_open_matching("*:*", DRM_TEST_MASTER); 127 128 if (fd < 0) { 129 fprintf(stderr, "failed to open any drm device\n"); 130 exit(0); 131 } 132 133 return fd; 134 135 } 136
