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/*
* Copyright © 2012 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:
* Ben Widawsky <ben@bwidawsk.net>
*
*/
#include "igt.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/utsname.h>
#include <time.h>
static bool is_x86_64;
static bool has_proper_timestamp;
struct local_drm_i915_reg_read {
__u64 offset;
__u64 val; /* Return value */
};
#define REG_READ_IOCTL DRM_IOWR(DRM_COMMAND_BASE + 0x31, struct local_drm_i915_reg_read)
#define RENDER_RING_TIMESTAMP 0x2358
static int read_register(int fd, uint64_t offset, uint64_t * val)
{
int ret = 0;
struct local_drm_i915_reg_read reg_read;
reg_read.offset = offset;
if (drmIoctl(fd, REG_READ_IOCTL, ®_read))
ret = -errno;
*val = reg_read.val;
return ret;
}
static bool check_kernel_x86_64(void)
{
int ret;
struct utsname uts;
ret = uname(&uts);
igt_assert_eq(ret, 0);
if (!strcmp(uts.machine, "x86_64"))
return true;
return false;
}
static bool check_timestamp(int fd)
{
int ret;
uint64_t val;
ret = read_register(fd, RENDER_RING_TIMESTAMP | 1, &val);
return ret == 0;
}
static int timer_query(int fd, uint64_t * val)
{
uint64_t offset;
int ret;
offset = RENDER_RING_TIMESTAMP;
if (has_proper_timestamp)
offset |= 1;
ret = read_register(fd, offset, val);
/*
* When reading the timestamp register with single 64b read, we are observing
* invalid values on x86_64:
*
* [f = valid counter value | X = garbage]
*
* i386: 0x0000000fffffffff
* x86_64: 0xffffffffXXXXXXXX
*
* In the absence of a corrected register read ioctl, attempt
* to fix up the return value to be vaguely useful.
*/
if (is_x86_64 && !has_proper_timestamp)
*val >>= 32;
return ret;
}
static void test_timestamp_moving(int fd)
{
uint64_t first_val, second_val;
igt_fail_on(timer_query(fd, &first_val) != 0);
sleep(1);
igt_fail_on(timer_query(fd, &second_val) != 0);
igt_assert(second_val != first_val);
}
static void test_timestamp_monotonic(int fd)
{
uint64_t first_val, second_val;
time_t start;
bool retry = true;
igt_fail_on(timer_query(fd, &first_val) != 0);
time(&start);
do {
retry:
igt_fail_on(timer_query(fd, &second_val) != 0);
if (second_val < first_val && retry) {
/* We may hit timestamp overflow once */
retry = false;
first_val = second_val;
goto retry;
}
igt_assert(second_val >= first_val);
} while(difftime(time(NULL), start) < 5);
}
igt_main
{
uint64_t val = 0;
int fd = -1;
igt_fixture {
fd = drm_open_driver(DRIVER_INTEL);
is_x86_64 = check_kernel_x86_64();
has_proper_timestamp = check_timestamp(fd);
}
igt_subtest("bad-register")
igt_assert_eq(read_register(fd, 0x12345678, &val), -EINVAL);
igt_subtest("timestamp-moving") {
igt_skip_on(timer_query(fd, &val) != 0);
test_timestamp_moving(fd);
}
igt_subtest("timestamp-monotonic") {
igt_skip_on(timer_query(fd, &val) != 0);
test_timestamp_monotonic(fd);
}
igt_fixture {
close(fd);
}
}
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