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| 3 | * Dhrystone benchmark test module
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| 4 | *
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| 5 | * Copyright (C) 2022 Glider bv
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| 6 |
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| 7 |
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| 8 | #include "dhry.h"
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| 9 |
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| 10 | #include <linux/kernel.h>
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| 11 | #include <linux/module.h>
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| 12 | #include <linux/moduleparam.h>
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| 13 | #include <linux/smp.h>
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| 14 |
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| 15 | #define DHRY_VAX 1757
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| 16 |
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| 17 | static int dhry_run_set(const char *val, const struct kernel_param *kp);
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| 18 | static const struct kernel_param_ops run_ops = {
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| 19 | .flags = KERNEL_PARAM_OPS_FL_NOARG,
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| 20 | .set = dhry_run_set,
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| 21 | };
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| 22 | static bool dhry_run;
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| 23 | module_param_cb(run, &run_ops, &dhry_run, 0200);
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| 24 | MODULE_PARM_DESC(run, "Run the test (default: false)");
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| 25 |
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| 26 | static int iterations = -1;
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| 27 | module_param(iterations, int, 0644);
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| 28 | MODULE_PARM_DESC(iterations,
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| 29 | "Number of iterations through the benchmark (default: auto)");
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| 30 |
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| 31 | static void dhry_benchmark(void)
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| 32 | {
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| 33 | unsigned int cpu = get_cpu();
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| 34 | int i, n;
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| 35 |
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| 36 | if (iterations > 0) {
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| 37 | n = dhry(iterations);
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| 38 | goto report;
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| 39 | }
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| 40 |
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| 41 | for (i = DHRY_VAX; i > 0; i <<= 1) {
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| 42 | n = dhry(i);
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| 43 | if (n != -EAGAIN)
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| 44 | break;
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| 45 | }
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| 46 |
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| 47 | report:
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| 48 | put_cpu();
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| 49 | if (n >= 0)
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| 50 | pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n", cpu,
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| 51 | n, n / DHRY_VAX);
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| 52 | else if (n == -EAGAIN)
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| 53 | pr_err("Please increase the number of iterations\n");
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| 54 | else
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| 55 | pr_err("Dhrystone benchmark failed error %pe\n", ERR_PTR(n));
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| 56 | }
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| 57 |
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| 58 | static int dhry_run_set(const char *val, const struct kernel_param *kp)
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| 59 | {
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| 60 | int ret;
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| 61 |
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| 62 | if (val) {
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| 63 | ret = param_set_bool(val, kp);
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| 64 | if (ret)
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| 65 | return ret;
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| 66 | } else {
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| 67 | dhry_run = true;
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| 68 | }
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| 69 |
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| 70 | if (dhry_run && system_state == SYSTEM_RUNNING)
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| 71 | dhry_benchmark();
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| 72 |
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| 73 | return 0;
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| 74 | }
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| 75 |
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| 76 | static int __init dhry_init(void)
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| 77 | {
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| 78 | if (dhry_run)
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| 79 | dhry_benchmark();
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| 80 |
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| 81 | return 0;
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| 82 | }
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| 83 | module_init(dhry_init);
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| 84 |
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| 85 | MODULE_AUTHOR("Geert Uytterhoeven <[email protected]>");
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| 86 | MODULE_DESCRIPTION("Dhrystone benchmark test module");
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| 87 | MODULE_LICENSE("GPL");
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