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https://github.com/AsahiLinux/u-boot
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1f865ee0ba
This patch adds the cyclic command, which currently only supports the 'list' subcommand, to list all currently registered cyclic functions. Here an example: => cyclic list function: cyclic_demo, cpu-time: 7010 us, frequency: 99.80 times/s function: cyclic_demo2, cpu-time: 1 us, frequency: 1.13 times/s As you can see, the cpu-time is accounted, so that cyclic functions that take too long might be discovered. Additionally the frequency is logged. The 'cyclic demo' commands registers the cyclic_demo() function to be executed all 'cycletime_ms' milliseconds. The only thing this function does is delaying by 'delay_us' microseconds. Signed-off-by: Stefan Roese <sr@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* A general-purpose cyclic execution infrastructure, to allow "small"
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* (run-time wise) functions to be executed at a specified frequency.
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* Things like LED blinking or watchdog triggering are examples for such
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* tasks.
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*
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* Copyright (C) 2022 Stefan Roese <sr@denx.de>
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*/
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#include <common.h>
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#include <command.h>
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#include <cyclic.h>
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#include <div64.h>
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#include <malloc.h>
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#include <linux/delay.h>
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struct cyclic_demo_info {
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uint delay_us;
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};
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static void cyclic_demo(void *ctx)
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{
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struct cyclic_demo_info *info = ctx;
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/* Just a small dummy delay here */
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udelay(info->delay_us);
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}
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static int do_cyclic_demo(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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struct cyclic_demo_info *info;
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struct cyclic_info *cyclic;
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uint time_ms;
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if (argc < 3)
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return CMD_RET_USAGE;
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info = malloc(sizeof(struct cyclic_demo_info));
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if (!info) {
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printf("out of memory\n");
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return CMD_RET_FAILURE;
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}
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time_ms = simple_strtoul(argv[1], NULL, 0);
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info->delay_us = simple_strtoul(argv[2], NULL, 0);
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/* Register demo cyclic function */
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cyclic = cyclic_register(cyclic_demo, time_ms * 1000, "cyclic_demo",
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info);
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if (!cyclic)
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printf("Registering of cyclic_demo failed\n");
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printf("Registered function \"%s\" to be executed all %dms\n",
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"cyclic_demo", time_ms);
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return 0;
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}
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static int do_cyclic_list(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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struct cyclic_info *cyclic, *tmp;
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u64 cnt, freq;
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list_for_each_entry_safe(cyclic, tmp, cyclic_get_list(), list) {
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cnt = cyclic->run_cnt * 1000000ULL * 100ULL;
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freq = lldiv(cnt, timer_get_us() - cyclic->start_time_us);
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printf("function: %s, cpu-time: %lld us, frequency: %lld.%02d times/s\n",
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cyclic->name, cyclic->cpu_time_us,
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lldiv(freq, 100), do_div(freq, 100));
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}
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return 0;
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}
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static char cyclic_help_text[] =
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"cyclic demo <cycletime_ms> <delay_us> - register cyclic demo function\n"
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"cyclic list - list cyclic functions\n";
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U_BOOT_CMD_WITH_SUBCMDS(cyclic, "Cyclic", cyclic_help_text,
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U_BOOT_SUBCMD_MKENT(demo, 3, 1, do_cyclic_demo),
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U_BOOT_SUBCMD_MKENT(list, 1, 1, do_cyclic_list));
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