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/*
* Copyright © 2017 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "igt.h"
#include "igt_sysfs.h"
#include <fcntl.h>
#include <sys/types.h>
#include <dirent.h>
static void read_and_discard_sysfs_entries(int path_fd)
{
struct dirent *dirent;
DIR *dir;
dir = fdopendir(path_fd);
if (!dir)
return;
while ((dirent = readdir(dir))) {
if (!strcmp(dirent->d_name, ".") ||
!strcmp(dirent->d_name, ".."))
continue;
if (dirent->d_type == DT_DIR) {
int sub_fd = -1;
igt_assert((sub_fd =
openat(path_fd, dirent->d_name, O_RDONLY |
O_DIRECTORY)) > 0);
read_and_discard_sysfs_entries(sub_fd);
close(sub_fd);
} else {
char buf[512];
int sub_fd;
ssize_t ret;
igt_set_timeout(5, "reading sysfs entry");
igt_debug("Reading file \"%s\"\n", dirent->d_name);
sub_fd = openat(path_fd, dirent->d_name, O_RDONLY);
if (sub_fd == -1) {
igt_debug("Could not open file \"%s\" with error: %m\n", dirent->d_name);
continue;
}
do {
ret = read(sub_fd, buf, sizeof(buf));
} while (ret == sizeof(buf));
if (ret == -1)
igt_debug("Could not read file \"%s\" with error: %m\n", dirent->d_name);
igt_reset_timeout();
close(sub_fd);
}
}
closedir(dir);
}
igt_main
{
int fd = -1, debugfs;
igt_skip_on_simulation();
igt_fixture {
fd = drm_open_driver_master(DRIVER_INTEL);
igt_require_gem(fd);
debugfs = igt_debugfs_dir(fd);
}
igt_subtest("read_all_entries") {
read_and_discard_sysfs_entries(debugfs);
}
igt_subtest("emon_crash") {
int i;
/*
* This check if we can crash the kernel with
* segmentation-fault by reading
* /sys/kernel/debug/dri/0/i915_emon_status too quickly
*/
for (i = 0; i < 1000; i++) {
char *buf = igt_sysfs_get(debugfs,
"i915_emon_status");
igt_skip_on_f(!buf && !i, "i915_emon_status could not be read\n");
igt_assert(buf);
free(buf);
}
/* If we got here, we haven't crashed */
igt_success();
}
igt_fixture {
close(debugfs);
close(fd);
}
}
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