tests: benchmarks: multicore: Add synchronization between cores

There is difference in boot time between Application and Radio cores.

When current consumption test is executed on two cores,
synchronize their startup.

Signed-off-by: Sebastian Głąb <sebastian.glab@nordicsemi.no>

tests/benchmarks/multicore/idle_pwm_led/remote/Kconfig

@@ -12,4 +12,11 @@ config TEST_SLEEP_DURATION_MS
 	  Based on the value of 'min-residency-us' specified for each power state defined in the DTS,
 	  core enters the lowest possible power state.
 
+config TEST_ROLE_REMOTE
+	bool "Execute test variant for Remote core"
+	default y
+	help
+	  KConfig used in synchronization phase.
+	  Set TEST_ROLE_REMOTE=y on core that shall synchronize with the Host core.
+
 source "Kconfig.zephyr"

tests/benchmarks/multicore/idle_pwm_led/src/main.c

@@ -8,6 +8,7 @@
 LOG_MODULE_REGISTER(idle_pwm_led, LOG_LEVEL_INF);
 
 #include <zephyr/kernel.h>
+#include <zephyr/cache.h>
 #include <zephyr/drivers/pwm.h>
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/pm/device_runtime.h>
@@ -16,9 +17,11 @@ LOG_MODULE_REGISTER(idle_pwm_led, LOG_LEVEL_INF);
 static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(DT_ALIAS(led), gpios);
 static const struct pwm_dt_spec pwm_led = PWM_DT_SPEC_GET(DT_ALIAS(pwm_led0));
 
-
 #define PWM_STEPS_PER_SEC	(50)
-
+#define SHM_START_ADDR		(DT_REG_ADDR(DT_NODELABEL(cpuapp_cpurad_ipc_shm)))
+volatile static uint32_t *shared_var = (volatile uint32_t *) SHM_START_ADDR;
+#define HOST_IS_READY	(1)
+#define REMOTE_IS_READY	(2)
 
 int main(void)
 {
@@ -71,9 +74,36 @@ int main(void)
 
 	LOG_INF("Multicore idle_pwm_led test on %s", CONFIG_BOARD_TARGET);
 	LOG_INF("Core will sleep for %d ms", CONFIG_TEST_SLEEP_DURATION_MS);
+	LOG_INF("Shared memory at %p", (void *) shared_var);
 
 #if defined(CONFIG_PM_DEVICE_RUNTIME)
-		pm_device_runtime_enable(pwm_led.dev);
+	pm_device_runtime_enable(pwm_led.dev);
+#endif
+
+	/* Synchronize Remote core with Host core */
+#if !defined(CONFIG_TEST_ROLE_REMOTE)
+	LOG_DBG("HOST starts");
+	*shared_var = HOST_IS_READY;
+	sys_cache_data_flush_range((void *) shared_var, sizeof(*shared_var));
+	LOG_DBG("HOST wrote HOST_IS_READY: %u", *shared_var);
+	while (*shared_var != REMOTE_IS_READY) {
+		k_msleep(1);
+		sys_cache_data_invd_range((void *) shared_var, sizeof(*shared_var));
+		LOG_DBG("shared_var is: %u", *shared_var);
+	}
+	LOG_DBG("HOST continues");
+#else
+	LOG_DBG("REMOTE starts");
+	while (*shared_var != HOST_IS_READY) {
+		k_msleep(1);
+		sys_cache_data_invd_range((void *) shared_var, sizeof(*shared_var));
+		LOG_DBG("shared_var is: %u", *shared_var);
+	}
+	LOG_DBG("REMOTE found that HOST_IS_READY");
+	*shared_var = REMOTE_IS_READY;
+	sys_cache_data_flush_range((void *) shared_var, sizeof(*shared_var));
+	LOG_DBG("REMOTE wrote REMOTE_IS_READY: %u", *shared_var);
+	LOG_DBG("REMOTE continues");
 #endif
 
 #if defined(CONFIG_COVERAGE)

tests/benchmarks/multicore/idle_pwm_loopback/remote/Kconfig

@@ -12,4 +12,11 @@ config TEST_SLEEP_DURATION_MS
 	  Based on the value of 'min-residency-us' specified for each power state defined in the DTS,
 	  core enters the lowest possible power state.
 
+config TEST_ROLE_REMOTE
+	bool "Execute test variant for Remote core"
+	default y
+	help
+	  KConfig used in synchronization phase.
+	  Set TEST_ROLE_REMOTE=y on core that shall synchronize with the Host core.
+
 source "Kconfig.zephyr"

tests/benchmarks/multicore/idle_pwm_loopback/src/main.c

@@ -8,6 +8,7 @@
 LOG_MODULE_REGISTER(idle_pwm_loop, LOG_LEVEL_INF);
 
 #include <zephyr/kernel.h>
+#include <zephyr/cache.h>
 #include <zephyr/drivers/pwm.h>
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/pm/device_runtime.h>
@@ -21,6 +22,11 @@ LOG_MODULE_REGISTER(idle_pwm_loop, LOG_LEVEL_INF);
 #error "Unsupported board: pwm_to_gpio_loopback node is not defined"
 #endif
 
+#define SHM_START_ADDR		(DT_REG_ADDR(DT_NODELABEL(cpuapp_cpurad_ipc_shm)))
+volatile static uint32_t *shared_var = (volatile uint32_t *) SHM_START_ADDR;
+#define HOST_IS_READY	(1)
+#define REMOTE_IS_READY	(2)
+
 static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(DT_ALIAS(led), gpios);
 
 static const struct gpio_dt_spec pin_in = GPIO_DT_SPEC_GET_BY_IDX(
@@ -133,6 +139,7 @@ int main(void)
 	LOG_INF("GPIO loopback at %s, pin %d", pin_in.port->name, pin_in.pin);
 	LOG_INF("Pulse/period: %u/%u usec", pulse / 1000, pwm_out.period / 1000);
 	LOG_INF("Expected number of edges in 1 second: %u (+/- %u)", edges, tolerance);
+	LOG_INF("Shared memory at %p", (void *) shared_var);
 	LOG_INF("===================================================================");
 
 	ret = pwm_is_ready_dt(&pwm_out);
@@ -162,6 +169,32 @@ int main(void)
 
 	k_timer_init(&my_timer, my_timer_handler, NULL);
 
+	/* Synchronize Remote core with Host core */
+#if !defined(CONFIG_TEST_ROLE_REMOTE)
+	LOG_DBG("HOST starts");
+	*shared_var = HOST_IS_READY;
+	sys_cache_data_flush_range((void *) shared_var, sizeof(*shared_var));
+	LOG_DBG("HOST wrote HOST_IS_READY: %u", *shared_var);
+	while (*shared_var != REMOTE_IS_READY) {
+		k_msleep(1);
+		sys_cache_data_invd_range((void *) shared_var, sizeof(*shared_var));
+		LOG_DBG("shared_var is: %u", *shared_var);
+	}
+	LOG_DBG("HOST continues");
+#else
+	LOG_DBG("REMOTE starts");
+	while (*shared_var != HOST_IS_READY) {
+		k_msleep(1);
+		sys_cache_data_invd_range((void *) shared_var, sizeof(*shared_var));
+		LOG_DBG("shared_var is: %u", *shared_var);
+	}
+	LOG_DBG("REMOTE found that HOST_IS_READY");
+	*shared_var = REMOTE_IS_READY;
+	sys_cache_data_flush_range((void *) shared_var, sizeof(*shared_var));
+	LOG_DBG("REMOTE wrote REMOTE_IS_READY: %u", *shared_var);
+	LOG_DBG("REMOTE continues");
+#endif
+
 #if defined(CONFIG_COVERAGE)
 	printk("Coverage analysis enabled\n");
 	while (test_repetitions--)