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(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 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