eleni@0: /*
eleni@0:  * Copyright © 2007 Intel Corporation
eleni@0:  *
eleni@0:  * Permission is hereby granted, free of charge, to any person obtaining a
eleni@0:  * copy of this software and associated documentation files (the "Software"),
eleni@0:  * to deal in the Software without restriction, including without limitation
eleni@0:  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
eleni@0:  * and/or sell copies of the Software, and to permit persons to whom the
eleni@0:  * Software is furnished to do so, subject to the following conditions:
eleni@0:  *
eleni@0:  * The above copyright notice and this permission notice (including the next
eleni@0:  * paragraph) shall be included in all copies or substantial portions of the
eleni@0:  * Software.
eleni@0:  *
eleni@0:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
eleni@0:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
eleni@0:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
eleni@0:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
eleni@0:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
eleni@0:  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
eleni@0:  * IN THE SOFTWARE.
eleni@0:  *
eleni@0:  * Authors:
eleni@0:  *    Eric Anholt <eric@anholt.net>
eleni@0:  *
eleni@0:  */
eleni@0: 
eleni@0: #include <string.h>
eleni@0: 
eleni@0: #include <fcntl.h>
eleni@0: #include <fnmatch.h>
eleni@0: #include <sys/stat.h>
eleni@0: #include <sys/ioctl.h>
eleni@0: #include "drmtest.h"
eleni@0: 
eleni@0: #define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE
eleni@0: #include <libudev.h>
eleni@0: 
eleni@0: static int is_master(int fd)
eleni@0: {
eleni@0: 	drm_client_t client;
eleni@0: 	int ret;
eleni@0: 
eleni@0: 	/* Check that we're the only opener and authed. */
eleni@0: 	client.idx = 0;
eleni@0: 	ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client);
eleni@0: 	assert (ret == 0);
eleni@0: 	if (!client.auth)
eleni@0: 		return 0;
eleni@0: 	client.idx = 1;
eleni@0: 	ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client);
eleni@0: 	if (ret != -1 || errno != EINVAL)
eleni@0: 		return 0;
eleni@0: 
eleni@0: 	return 1;
eleni@0: }
eleni@0: 
eleni@0: /** Open the first DRM device matching the criteria */
eleni@0: int drm_open_matching(const char *pci_glob, int flags)
eleni@0: {
eleni@0: 	struct udev *udev;
eleni@0: 	struct udev_enumerate *e;
eleni@0: 	struct udev_device *device, *parent;
eleni@0:         struct udev_list_entry *entry;
eleni@0: 	const char *pci_id, *path;
eleni@0: 	int fd;
eleni@0: 
eleni@0: 	udev = udev_new();
eleni@0: 	if (udev == NULL) {
eleni@0: 		fprintf(stderr, "failed to initialize udev context\n");
eleni@0: 		abort();
eleni@0: 	}
eleni@0: 
eleni@0: 	fd = -1;
eleni@0: 	e = udev_enumerate_new(udev);
eleni@0: 	udev_enumerate_add_match_subsystem(e, "drm");
eleni@0:         udev_enumerate_scan_devices(e);
eleni@0:         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
eleni@0: 		path = udev_list_entry_get_name(entry);
eleni@0: 		device = udev_device_new_from_syspath(udev, path);
eleni@0: 		parent = udev_device_get_parent(device);
eleni@0: 		/* Filter out KMS output devices. */
eleni@0: 		if (strcmp(udev_device_get_subsystem(parent), "pci") != 0)
eleni@0: 			continue;
eleni@0: 		pci_id = udev_device_get_property_value(parent, "PCI_ID");
eleni@0: 		if (fnmatch(pci_glob, pci_id, 0) != 0)
eleni@0: 			continue;
eleni@0: 		fd = open(udev_device_get_devnode(device), O_RDWR);
eleni@0: 		if (fd < 0)
eleni@0: 			continue;
eleni@0: 		if ((flags & DRM_TEST_MASTER) && !is_master(fd)) {
eleni@0: 			close(fd);
eleni@0: 			fd = -1;
eleni@0: 			continue;
eleni@0: 		}
eleni@0: 
eleni@0: 		break;
eleni@0: 	}
eleni@0:         udev_enumerate_unref(e);
eleni@0: 	udev_unref(udev);
eleni@0: 
eleni@0: 	return fd;
eleni@0: }
eleni@0: 
eleni@0: int drm_open_any(void)
eleni@0: {
eleni@0: 	int fd = drm_open_matching("*:*", 0);
eleni@0: 
eleni@0: 	if (fd < 0) {
eleni@0: 		fprintf(stderr, "failed to open any drm device\n");
eleni@0: 		abort();
eleni@0: 	}
eleni@0: 
eleni@0: 	return fd;
eleni@0: }
eleni@0: 
eleni@0: /**
eleni@0:  * Open the first DRM device we can find where we end up being the master.
eleni@0:  */
eleni@0: int drm_open_any_master(void)
eleni@0: {
eleni@0: 	int fd = drm_open_matching("*:*", DRM_TEST_MASTER);
eleni@0: 
eleni@0: 	if (fd < 0) {
eleni@0: 		fprintf(stderr, "failed to open any drm device\n");
eleni@0: 		abort();
eleni@0: 	}
eleni@0: 
eleni@0: 	return fd;
eleni@0: 
eleni@0: }