diff options
| author | Xiao Guangrong <xiaoguangrong@tencent.com> | 2017-05-27 10:53:01 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-06-06 20:18:35 +0200 |
| commit | bd618eab7641693f0838da52c5af5c8050f831d3 (patch) | |
| tree | 67073e289005de2a59b5c1f722a981b0c9aacb0e /tests/rtc-test.c | |
| parent | e0c8b950d17a57343926ed937af10e8903b0d6cc (diff) | |
qtest: add rtc periodic timer test
It tests the accuracy of rtc periodic timer which is recently
improved & fixed by commit 7ffcb539a3 ("mc146818rtc: precisely count
the clock for periodic timer", 2017-05-19).
Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>
Message-Id: <20170527025301.23499-1-xiaoguangrong@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tests/rtc-test.c')
| -rw-r--r-- | tests/rtc-test.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/tests/rtc-test.c b/tests/rtc-test.c index a086efd120..e78f701afb 100644 --- a/tests/rtc-test.c +++ b/tests/rtc-test.c @@ -14,6 +14,7 @@ #include "qemu/osdep.h" #include "libqtest.h" +#include "qemu/timer.h" #include "hw/timer/mc146818rtc_regs.h" static uint8_t base = 0x70; @@ -542,6 +543,52 @@ static void register_b_set_flag(void) g_assert_cmpint(cmos_read(RTC_CENTURY), ==, 0x20); } +#define RTC_PERIOD_CODE1 13 /* 8 Hz */ +#define RTC_PERIOD_CODE2 15 /* 2 Hz */ + +#define RTC_PERIOD_TEST_NR 50 + +static uint64_t wait_periodic_interrupt(uint64_t real_time) +{ + while (!get_irq(RTC_ISA_IRQ)) { + real_time = clock_step_next(); + } + + g_assert((cmos_read(RTC_REG_C) & REG_C_PF) != 0); + return real_time; +} + +static void periodic_timer(void) +{ + int i; + uint64_t period_clocks, period_time, start_time, real_time; + + /* disable all interrupts. */ + cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) & + ~(REG_B_PIE | REG_B_AIE | REG_B_UIE)); + cmos_write(RTC_REG_A, RTC_PERIOD_CODE1); + /* enable periodic interrupt after properly configure the period. */ + cmos_write(RTC_REG_B, cmos_read(RTC_REG_B) | REG_B_PIE); + + start_time = real_time = clock_step_next(); + + for (i = 0; i < RTC_PERIOD_TEST_NR; i++) { + cmos_write(RTC_REG_A, RTC_PERIOD_CODE1); + real_time = wait_periodic_interrupt(real_time); + cmos_write(RTC_REG_A, RTC_PERIOD_CODE2); + real_time = wait_periodic_interrupt(real_time); + } + + period_clocks = periodic_period_to_clock(RTC_PERIOD_CODE1) + + periodic_period_to_clock(RTC_PERIOD_CODE2); + period_clocks *= RTC_PERIOD_TEST_NR; + period_time = periodic_clock_to_ns(period_clocks); + + real_time -= start_time; + g_assert_cmpint(ABS((int64_t)(real_time - period_time)), <=, + NANOSECONDS_PER_SECOND * 0.5); +} + int main(int argc, char **argv) { QTestState *s = NULL; @@ -564,6 +611,8 @@ int main(int argc, char **argv) qtest_add_func("/rtc/set-year/1980", set_year_1980); qtest_add_func("/rtc/misc/register_b_set_flag", register_b_set_flag); qtest_add_func("/rtc/misc/fuzz-registers", fuzz_registers); + qtest_add_func("/rtc/periodic/interrupt", periodic_timer); + ret = g_test_run(); if (s) { |