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59c4597071
This allows the minimum time that default_delay() will choose to sleep for instead of polling to be configured at build-time. The default remains unchanged at 100 milliseconds for now. The test's correctness has been checked by testing with minimum sleep time left at its default and set to a non-default value smaller than 100 microseconds (both pass without sleeping, verified with strace) and with the minimum sleep time set to 0 (causing the test to be skipped). The configured value from the macro needs to be stored in a const to avoid -Werror=type-limits errors when configured to be zero. Change-Id: Ida96e0816ac914ed69d6fd82ad90ebe89cdef1cc Signed-off-by: Peter Marheine <pmarheine@chromium.org> Reviewed-on: https://review.coreboot.org/c/flashrom/+/81606 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* Copyright 2024 Google LLC
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <include/test.h>
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#include <stdint.h>
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#include <sys/time.h>
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#include <time.h>
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#include "programmer.h"
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#include "tests.h"
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static uint64_t now_us(void) {
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#if HAVE_CLOCK_GETTIME == 1
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return (ts.tv_nsec / 1000) + (ts.tv_sec * 1000000);
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#else
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_usec + (tv.tv_sec * 1000000);
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#endif
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}
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static const int64_t min_sleep = CONFIG_DELAY_MINIMUM_SLEEP_US;
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/*
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* A short delay should delay for at least as long as requested,
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* and more than 10x as long would be worrisome.
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*
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* This test could fail spuriously on a heavily-loaded system, or if we need
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* to use gettimeofday() and a time change (such as DST) occurs during the
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* test.
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*/
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void udelay_test_short(void **state) {
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/*
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* Delay for 100 microseconds, or short enough that we won't sleep.
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* It's not useful to test the sleep path because we assume the OS won't
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* sleep for less time than we ask.
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*/
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int64_t delay_us = 100;
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if (delay_us >= min_sleep)
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delay_us = min_sleep - 1;
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/* No point in running this test if delay always sleeps. */
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if (delay_us <= 0)
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skip();
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uint64_t start = now_us();
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default_delay(delay_us);
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uint64_t elapsed = now_us() - start;
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assert_in_range(elapsed, delay_us, 10 * delay_us);
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}
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