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 | { |
34 | unsigned int cpu = get_cpu(); |
35 | int i, n; |
36 | |
37 | if (iterations > 0) { |
38 | n = dhry(n: iterations); |
39 | goto report; |
40 | } |
41 | |
42 | for (i = DHRY_VAX; i > 0; i <<= 1) { |
43 | n = dhry(n: i); |
44 | if (n != -EAGAIN) |
45 | break; |
46 | } |
47 | |
48 | report: |
49 | put_cpu(); |
50 | if (n >= 0) |
51 | pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n" , cpu, |
52 | n, n / DHRY_VAX); |
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 <geert+renesas@glider.be>" ); |
87 | MODULE_LICENSE("GPL" ); |
88 | |