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tests/kernel/smp: Add SMP switch torture test

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Formalize and rework the issue reproducer for #40795 and add it to the
SMP test suite.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
This commit is contained in:
Carlo Caione 2022-01-17 17:04:25 +01:00 committed by Anas Nashif
parent 322175e4fc
commit 8edf9817c0
4 changed files with 89 additions and 1 deletions
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4
tests/kernel/smp/boards/qemu_cortex_a53_smp.conf Normal file
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@ -0,0 +1,4 @@
# Copyright (c) 2022 Carlo Caione <ccaione@baylibre.com>
# SPDX-License-Identifier: Apache-2.0
CONFIG_MP_NUM_CPUS=4

19
tests/kernel/smp/boards/qemu_cortex_a53_smp.overlay Normal file
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@ -0,0 +1,19 @@
/* Copyright 2022 Carlo Caione <ccaione@baylibre.com>
* SPDX-License-Identifier: Apache-2.0
*/
/ {
cpus {
cpu@2 {
device_type = "cpu";
compatible = "arm,cortex-a53";
reg = <2>;
};
cpu@3 {
device_type = "cpu";
compatible = "arm,cortex-a53";
reg = <3>;
};
};
};

1
tests/kernel/smp/prj.conf
View file

@ -1,3 +1,4 @@
CONFIG_ZTEST=y
CONFIG_SMP=y
CONFIG_TRACE_SCHED_IPI=y
CONFIG_POLL=y

66
tests/kernel/smp/src/main.c
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@ -22,6 +22,7 @@
#define EQUAL_PRIORITY 1
#define TIME_SLICE_MS 500
#define THREAD_DELAY 1
#define SLEEP_MS_LONG 15000
struct k_thread t2;
K_THREAD_STACK_DEFINE(t2_stack, T2_STACK_SIZE);
@ -52,6 +53,9 @@ static K_THREAD_STACK_ARRAY_DEFINE(tstack, THREADS_NUM, STACK_SIZE);
static volatile int thread_started[THREADS_NUM - 1];
static struct k_poll_signal tsignal[THREADS_NUM];
static struct k_poll_event tevent[THREADS_NUM];
static int curr_cpu(void)
{
unsigned int k = arch_irq_lock();
@ -948,6 +952,65 @@ void test_inc_concurrency(void)
"total count %d is wrong(M)", global_cnt);
}
/**
* @brief Torture test for context switching code
*
* @ingroup kernel_smp_tests
*
* @details Leverage the polling API to stress test the context switching code.
* This test will hammer all the CPUs with thread swapping requests.
*/
static void process_events(void *arg0, void *arg1, void *arg2)
{
uintptr_t id = (uintptr_t) arg0;
while (1) {
k_poll(&tevent[id], 1, K_FOREVER);
if (tevent[id].signal->result != 0x55) {
ztest_test_fail();
}
tevent[id].signal->signaled = 0;
tevent[id].state = K_POLL_STATE_NOT_READY;
k_poll_signal_reset(&tsignal[id]);
}
}
static void signal_raise(void *arg0, void *arg1, void *arg2)
{
while (1) {
for (uintptr_t i = 0; i < THREADS_NUM; i++) {
k_poll_signal_raise(&tsignal[i], 0x55);
}
}
}
void test_smp_switch_torture(void)
{
for (uintptr_t i = 0; i < THREADS_NUM; i++) {
k_poll_signal_init(&tsignal[i]);
k_poll_event_init(&tevent[i], K_POLL_TYPE_SIGNAL,
K_POLL_MODE_NOTIFY_ONLY, &tsignal[i]);
k_thread_create(&tthread[i], tstack[i], STACK_SIZE,
(k_thread_entry_t) process_events,
(void *) i, NULL, NULL, K_PRIO_PREEMPT(i + 1),
K_INHERIT_PERMS, K_NO_WAIT);
}
k_thread_create(&t2, t2_stack, T2_STACK_SIZE, signal_raise,
NULL, NULL, NULL, K_PRIO_COOP(2), 0, K_NO_WAIT);
k_sleep(K_MSEC(SLEEP_MS_LONG));
k_thread_abort(&t2);
for (uintptr_t i = 0; i < THREADS_NUM; i++) {
k_thread_abort(&tthread[i]);
}
}
void test_main(void)
{
/* Sleep a bit to guarantee that both CPUs enter an idle
@ -969,7 +1032,8 @@ void test_main(void)
ztest_unit_test(test_fatal_on_smp),
ztest_unit_test(test_workq_on_smp),
ztest_unit_test(test_smp_release_global_lock),
ztest_unit_test(test_inc_concurrency)
ztest_unit_test(test_inc_concurrency),
ztest_unit_test(test_smp_switch_torture)
);
ztest_run_test_suite(smp);
}