// SPDX-License-Identifier: GPL-2.0-only /* * Dhrystone benchmark test module * * Copyright (C) 2022 Glider bv */ #include "dhry.h" #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/smp.h> #define DHRY_VAX 1757 static int dhry_run_set(const char *val, const struct kernel_param *kp); static const struct kernel_param_ops run_ops = { .flags = KERNEL_PARAM_OPS_FL_NOARG, .set = dhry_run_set, }; static bool dhry_run; module_param_cb(run, &run_ops, &dhry_run, 0200); MODULE_PARM_DESC(run, "Run the test (default: false)"); static int iterations = -1; module_param(iterations, int, 0644); MODULE_PARM_DESC(iterations, "Number of iterations through the benchmark (default: auto)"); static void dhry_benchmark(void) { unsigned int cpu = get_cpu(); int i, n; if (iterations > 0) { n = dhry(iterations); goto report; } for (i = DHRY_VAX; i > 0; i <<= 1) { n = dhry(i); if (n != -EAGAIN) break; } report: put_cpu(); if (n >= 0) pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n", cpu, n, n / DHRY_VAX); else if (n == -EAGAIN) pr_err("Please increase the number of iterations\n"); else pr_err("Dhrystone benchmark failed error %pe\n", ERR_PTR(n)); } static int dhry_run_set(const char *val, const struct kernel_param *kp) { int ret; if (val) { ret = param_set_bool(val, kp); if (ret) return ret; } else { dhry_run = true; } if (dhry_run && system_state == SYSTEM_RUNNING) dhry_benchmark(); return 0; } static int __init dhry_init(void) { if (dhry_run) dhry_benchmark(); return 0; } module_init(dhry_init); MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>"); MODULE_DESCRIPTION("Dhrystone benchmark test module"); MODULE_LICENSE("GPL");