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/smp.h> |
14 | |
15 | #define DHRY_VAX 1757 |
16 | |
17 | static int dhry_run_set(const char *val, const struct kernel_param *kp); |
18 | static const struct kernel_param_ops run_ops = { |
19 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
20 | .set = dhry_run_set, |
21 | }; |
22 | static bool dhry_run; |
23 | module_param_cb(run, &run_ops, &dhry_run, 0200); |
24 | MODULE_PARM_DESC(run, "Run the test (default: false)" ); |
25 | |
26 | static int iterations = -1; |
27 | module_param(iterations, int, 0644); |
28 | MODULE_PARM_DESC(iterations, |
29 | "Number of iterations through the benchmark (default: auto)" ); |
30 | |
31 | static void dhry_benchmark(void) |
32 | { |
33 | unsigned int cpu = get_cpu(); |
34 | int i, n; |
35 | |
36 | if (iterations > 0) { |
37 | n = dhry(n: iterations); |
38 | goto report; |
39 | } |
40 | |
41 | for (i = DHRY_VAX; i > 0; i <<= 1) { |
42 | n = dhry(n: i); |
43 | if (n != -EAGAIN) |
44 | break; |
45 | } |
46 | |
47 | report: |
48 | put_cpu(); |
49 | if (n >= 0) |
50 | pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n" , cpu, |
51 | n, n / DHRY_VAX); |
52 | else if (n == -EAGAIN) |
53 | pr_err("Please increase the number of iterations\n" ); |
54 | else |
55 | pr_err("Dhrystone benchmark failed error %pe\n" , ERR_PTR(n)); |
56 | } |
57 | |
58 | static int dhry_run_set(const char *val, const struct kernel_param *kp) |
59 | { |
60 | int ret; |
61 | |
62 | if (val) { |
63 | ret = param_set_bool(val, kp); |
64 | if (ret) |
65 | return ret; |
66 | } else { |
67 | dhry_run = true; |
68 | } |
69 | |
70 | if (dhry_run && system_state == SYSTEM_RUNNING) |
71 | dhry_benchmark(); |
72 | |
73 | return 0; |
74 | } |
75 | |
76 | static int __init dhry_init(void) |
77 | { |
78 | if (dhry_run) |
79 | dhry_benchmark(); |
80 | |
81 | return 0; |
82 | } |
83 | module_init(dhry_init); |
84 | |
85 | MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>" ); |
86 | MODULE_LICENSE("GPL" ); |
87 | |