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