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      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 <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 
     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 */
     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 
    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  */
    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