projects / thirdparty / linux.git / blame
| 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> | |
| d5528cc1 GU |
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 | { | |
| 13684e96 | 33 | unsigned int cpu = get_cpu(); |
| d5528cc1 GU |
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: | |
| 13684e96 | 48 | put_cpu(); |
| d5528cc1 | 49 | if (n >= 0) |
| 13684e96 GU |
50 | pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n", cpu, |
| 51 | n, n / DHRY_VAX); | |
| d5528cc1 GU |
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"); |