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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright (c) 2015-2018 Linaro Limited
* Copyright (c) 2024 Nokia
*/
#include <odp_posix_extensions.h>
#include <odp/api/hints.h>
#include <odp/api/time_types.h>
#include <odp/api/abi/time_cpu.h>
#include <odp_debug_internal.h>
#include <time.h>
#include <errno.h>
#include <string.h>
static int nwait(uint64_t nsec)
{
struct timespec ts1, ts2;
uint64_t diff;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts1))
return 1;
do {
if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts2))
return 1;
diff = (ts2.tv_sec - ts1.tv_sec) * ODP_TIME_SEC_IN_NS +
ts2.tv_nsec - ts1.tv_nsec;
} while (diff < nsec);
return 0;
}
static void sort(uint64_t values[], int num)
{
for (int n = 0; n < num; n++) {
for (int i = n + 1; i < num; i++) {
if (values[i] < values[n]) {
uint64_t tmp = values[i];
values[i] = values[n];
values[n] = tmp;
}
}
}
}
static uint64_t median(uint64_t values[], int num)
{
sort(values, num);
if (num % 2 == 0)
return (values[num / 2 - 1] + values[num / 2]) / 2;
else
return values[num / 2];
}
/* Measure TSC frequency. */
uint64_t _odp_time_cpu_global_freq(void)
{
struct timespec ts1, ts2;
uint64_t t1, t2, ts_nsec, cycles;
int i;
const int rounds = 6; /* first round is warmup */
int warm_up = 1;
uint64_t hz[rounds];
for (i = 0; i < rounds; i++) {
uint64_t wait_nsec = ODP_TIME_SEC_IN_NS / 50;
if (warm_up)
wait_nsec = ODP_TIME_SEC_IN_NS / 1000;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts1))
goto err_out;
t1 = _odp_time_cpu_global();
if (nwait(wait_nsec))
goto err_out;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts2))
goto err_out;
t2 = _odp_time_cpu_global();
ts_nsec = (ts2.tv_sec - ts1.tv_sec) * ODP_TIME_SEC_IN_NS;
ts_nsec += ts2.tv_nsec - ts1.tv_nsec;
cycles = t2 - t1;
hz[i] = (cycles * ODP_TIME_SEC_IN_NS) / ts_nsec;
if (warm_up)
warm_up = 0;
}
return median(&hz[1], rounds - 1);
err_out:
_ODP_ERR("clock_gettime() failed (%s)\n", strerror(errno));
return 0;
}
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