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 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 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 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