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// SPDX-License-Identifier: GPL-2.0-only
/*
* Dhrystone benchmark test module
*
* Copyright (C) 2022 Glider bv
*/
#include "dhry.h"
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/smp.h>
#define DHRY_VAX 1757
static int dhry_run_set(const char *val, const struct kernel_param *kp);
static const struct kernel_param_ops run_ops = {
.flags = KERNEL_PARAM_OPS_FL_NOARG,
.set = dhry_run_set,
};
static bool dhry_run;
module_param_cb(run, &run_ops, &dhry_run, 0200);
MODULE_PARM_DESC(run, "Run the test (default: false)");
static int iterations = -1;
module_param(iterations, int, 0644);
MODULE_PARM_DESC(iterations,
"Number of iterations through the benchmark (default: auto)");
static void dhry_benchmark(void)
{
unsigned int cpu = get_cpu();
int i, n;
if (iterations > 0) {
n = dhry(iterations);
goto report;
}
for (i = DHRY_VAX; i > 0; i <<= 1) {
n = dhry(i);
if (n != -EAGAIN)
break;
}
report:
put_cpu();
if (n >= 0)
pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n", cpu,
n, n / DHRY_VAX);
else if (n == -EAGAIN)
pr_err("Please increase the number of iterations\n");
else
pr_err("Dhrystone benchmark failed error %pe\n", ERR_PTR(n));
}
static int dhry_run_set(const char *val, const struct kernel_param *kp)
{
int ret;
if (val) {
ret = param_set_bool(val, kp);
if (ret)
return ret;
} else {
dhry_run = true;
}
if (dhry_run && system_state == SYSTEM_RUNNING)
dhry_benchmark();
return 0;
}
static int __init dhry_init(void)
{
if (dhry_run)
dhry_benchmark();
return 0;
}
module_init(dhry_init);
MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
MODULE_LICENSE("GPL");
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