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
dhry_benchmark(void)32 static void dhry_benchmark(void)
33 {
34 int i, n;
35
36 if (iterations > 0) {
37 n = dhry(iterations);
38 goto report;
39 }
40
41 for (i = DHRY_VAX; i > 0; i <<= 1) {
42 n = dhry(i);
43 if (n != -EAGAIN)
44 break;
45 }
46
47 report:
48 if (n >= 0)
49 pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n",
50 smp_processor_id(), n, n / DHRY_VAX);
51 else if (n == -EAGAIN)
52 pr_err("Please increase the number of iterations\n");
53 else
54 pr_err("Dhrystone benchmark failed error %pe\n", ERR_PTR(n));
55 }
56
dhry_run_set(const char * val,const struct kernel_param * kp)57 static int dhry_run_set(const char *val, const struct kernel_param *kp)
58 {
59 int ret;
60
61 if (val) {
62 ret = param_set_bool(val, kp);
63 if (ret)
64 return ret;
65 } else {
66 dhry_run = true;
67 }
68
69 if (dhry_run && system_state == SYSTEM_RUNNING)
70 dhry_benchmark();
71
72 return 0;
73 }
74
dhry_init(void)75 static int __init dhry_init(void)
76 {
77 if (dhry_run)
78 dhry_benchmark();
79
80 return 0;
81 }
82 module_init(dhry_init);
83
84 MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
85 MODULE_LICENSE("GPL");
86