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