1 // SPDX-License-Identifier: GPL-2.0-only
3 * Dhrystone benchmark test module
5 * Copyright (C) 2022 Glider bv
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>
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
,
24 module_param_cb(run
, &run_ops
, &dhry_run
, 0200);
25 MODULE_PARM_DESC(run
, "Run the test (default: false)");
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)");
32 static void dhry_benchmark(void)
34 unsigned int cpu
= get_cpu();
42 for (i
= DHRY_VAX
; i
> 0; i
<<= 1) {
51 pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n", cpu
,
53 else if (n
== -EAGAIN
)
54 pr_err("Please increase the number of iterations\n");
56 pr_err("Dhrystone benchmark failed error %pe\n", ERR_PTR(n
));
59 static int dhry_run_set(const char *val
, const struct kernel_param
*kp
)
64 ret
= param_set_bool(val
, kp
);
71 if (dhry_run
&& system_state
== SYSTEM_RUNNING
)
77 static int __init
dhry_init(void)
84 module_init(dhry_init
);
86 MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
87 MODULE_LICENSE("GPL");