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/*
* Copyright (c) 2013 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:
* Daniel Vetter <daniel.vetter@ffwll.ch>
*/
#include <sys/ioctl.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>
#include "i915/gem_create.h"
#include "igt.h"
#include "igt_stats.h"
IGT_TEST_DESCRIPTION("Check for flink/open vs. gem close races.");
/* Testcase: check for flink/open vs. gem close races
*
* The gem flink open ioctl had a little race with gem close which could result
* in the flink name and corresponding reference getting leaked.
*/
/* We want lockless and I'm to lazy to dig out an atomic library. On x86 this
* works, too. */
volatile int pls_die = 0;
int fd;
struct flink_name {
pthread_t thread;
unsigned long count;
};
static void *thread_fn_flink_name(void *p)
{
struct flink_name *t = p;
struct drm_gem_open open_struct;
int ret;
while (!pls_die) {
memset(&open_struct, 0, sizeof(open_struct));
open_struct.name = 1;
ret = ioctl(fd, DRM_IOCTL_GEM_OPEN, &open_struct);
if (ret == 0) {
uint32_t name = gem_flink(fd, open_struct.handle);
igt_assert(name == 1);
gem_close(fd, open_struct.handle);
t->count++;
} else
igt_assert(errno == ENOENT);
}
return (void *)0;
}
static void test_flink_name(int timeout)
{
struct flink_name *threads;
int r, i, num_threads;
unsigned long count;
igt_stats_t stats;
void *status;
num_threads = sysconf(_SC_NPROCESSORS_ONLN) - 1;
if (!num_threads)
num_threads = 1;
threads = calloc(num_threads, sizeof(*threads));
fd = drm_open_driver(DRIVER_INTEL);
for (i = 0; i < num_threads; i++) {
r = pthread_create(&threads[i].thread, NULL,
thread_fn_flink_name, &threads[i]);
igt_assert_eq(r, 0);
}
count = 0;
igt_until_timeout(timeout) {
uint32_t handle;
handle = gem_create(fd, 4096);
gem_flink(fd, handle);
gem_close(fd, handle);
count++;
}
pls_die = 1;
igt_stats_init_with_size(&stats, num_threads);
for (i = 0; i < num_threads; i++) {
pthread_join(threads[i].thread, &status);
igt_assert(status == 0);
igt_stats_push(&stats, threads[i].count);
}
igt_info("Completed %lu cycles with %.0f [%"PRIu64", %"PRIu64"] races\n",
count,
igt_stats_get_median(&stats),
igt_stats_get_min(&stats),
igt_stats_get_max(&stats));
igt_stats_fini(&stats);
close(fd);
}
static void *thread_fn_flink_close(void *p)
{
struct drm_gem_flink flink;
struct drm_gem_close close_bo;
uint32_t handle;
while (!pls_die) {
/* We want to race gem close against flink on handle one.*/
handle = gem_create(fd, 4096);
if (handle != 1)
gem_close(fd, handle);
/* raw ioctl since we expect this to fail */
flink.handle = 1;
ioctl(fd, DRM_IOCTL_GEM_FLINK, &flink);
close_bo.handle = 1;
ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
}
return (void *)0;
}
static void test_flink_close(void)
{
pthread_t *threads;
int r, i, num_threads;
int obj_count;
void *status;
int fake;
/* Allocate exit handler fds in here so that we dont screw
* up the counts */
fake = drm_open_driver(DRIVER_INTEL);
obj_count = igt_get_stable_obj_count(fake);
num_threads = sysconf(_SC_NPROCESSORS_ONLN);
threads = calloc(num_threads, sizeof(pthread_t));
fd = drm_open_driver(DRIVER_INTEL);
for (i = 0; i < num_threads; i++) {
r = pthread_create(&threads[i], NULL,
thread_fn_flink_close, NULL);
igt_assert_eq(r, 0);
}
sleep(5);
pls_die = 1;
for (i = 0; i < num_threads; i++) {
pthread_join(threads[i], &status);
igt_assert(status == 0);
}
close(fd);
obj_count = igt_get_stable_obj_count(fake) - obj_count;
igt_info("leaked %i objects\n", obj_count);
close(fake);
igt_assert_eq(obj_count, 0);
}
igt_main
{
igt_subtest("flink_name")
test_flink_name(5);
igt_subtest("flink_close")
test_flink_close();
}
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