[linux.git] / lib / dhry_run.c

// 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/mutex.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 <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
d5528cc1 GU	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* Dhrystone benchmark test module
	4	*
	5	* Copyright (C) 2022 Glider bv
	6	*/
	7
	8	#include "dhry.h"
	9
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/moduleparam.h>
	13	#include <linux/mutex.h>
	14	#include <linux/smp.h>
	15
	16	#define DHRY_VAX 1757
	17
	18	static int dhry_run_set(const char val, const struct kernel_param kp);
	19	static const struct kernel_param_ops run_ops = {
	20	.flags = KERNEL_PARAM_OPS_FL_NOARG,
	21	.set = dhry_run_set,
	22	};
	23	static bool dhry_run;
	24	module_param_cb(run, &run_ops, &dhry_run, 0200);
	25	MODULE_PARM_DESC(run, "Run the test (default: false)");
	26
	27	static int iterations = -1;
	28	module_param(iterations, int, 0644);
	29	MODULE_PARM_DESC(iterations,
	30	"Number of iterations through the benchmark (default: auto)");
	31
	32	static void dhry_benchmark(void)
	33	{
13684e96	34	unsigned int cpu = get_cpu();
d5528cc1 GU	35	int i, n;
	36
	37	if (iterations > 0) {
	38	n = dhry(iterations);
	39	goto report;
	40	}
	41
	42	for (i = DHRY_VAX; i > 0; i <<= 1) {
	43	n = dhry(i);
	44	if (n != -EAGAIN)
	45	break;
	46	}
	47
	48	report:
13684e96	49	put_cpu();
d5528cc1	50	if (n >= 0)
13684e96 GU	51	pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n", cpu,
13684e96 GU	52	n, n / DHRY_VAX);
d5528cc1 GU	53	else if (n == -EAGAIN)
	54	pr_err("Please increase the number of iterations\n");
	55	else
	56	pr_err("Dhrystone benchmark failed error %pe\n", ERR_PTR(n));
	57	}
	58
	59	static int dhry_run_set(const char val, const struct kernel_param kp)
	60	{
	61	int ret;
	62
	63	if (val) {
	64	ret = param_set_bool(val, kp);
	65	if (ret)
	66	return ret;
	67	} else {
	68	dhry_run = true;
	69	}
	70
	71	if (dhry_run && system_state == SYSTEM_RUNNING)
	72	dhry_benchmark();
	73
	74	return 0;
	75	}
	76
	77	static int __init dhry_init(void)
	78	{
	79	if (dhry_run)
	80	dhry_benchmark();
	81
	82	return 0;
	83	}
	84	module_init(dhry_init);
	85
	86	MODULE_AUTHOR("Geert Uytterhoeven <[email protected]>");
	87	MODULE_LICENSE("GPL");