Profile low condition events.

Add the sleep events point for x86 and ARM arquitectures that gives
information about when the CPU went to sleep mode, when it woke up
and which interrupt causes the CPU to awake.

Change-Id: Iaa06a678eab661357d084ee1f79c4cfcf19bf85d
Signed-off-by: Yonattan Louise <yonattan.a.louise.mendoza@intel.com>

arch/arc/defconfig

@@ -18,6 +18,7 @@ CONFIG_XIP=y
 # CONFIG_PROFILER_BUFFER_SIZE is not set
 # CONFIG_PROFILER_CONTEXT_SWITCH is not set
 # CONFIG_PROFILER_INTERRUPT is not set
+# CONFIG_PROFILER_SLEEP is not set
 
 #
 # Nanokernel Options

arch/arm/core/cpu_idle.S

@@ -134,6 +134,12 @@ SECTION_FUNC(TEXT, _NanoIdleValClear)
  */
 
 SECTION_FUNC(TEXT, nano_cpu_idle)
+#ifdef CONFIG_PROFILER_SLEEP
+	push {lr}
+	bl    _sys_profiler_enter_sleep
+	pop {lr}
+#endif
+
     /* clear BASEPRI so wfi is awakened by incoming interrupts */
     eors.n r0, r0
     msr BASEPRI, r0
@@ -169,6 +175,11 @@ SECTION_FUNC(TEXT, nano_cpu_idle)
  */
 
 SECTION_FUNC(TEXT, nano_cpu_atomic_idle)
+#ifdef CONFIG_PROFILER_SLEEP
+	push {lr}
+	bl    _sys_profiler_enter_sleep
+	pop {lr}
+#endif
 
     /*
      * r0: interrupt mask from caller

arch/arm/defconfig

@@ -19,6 +19,7 @@ CONFIG_XIP=y
 # CONFIG_PROFILER_BUFFER_SIZE is not set
 # CONFIG_PROFILER_CONTEXT_SWITCH is not set
 # CONFIG_PROFILER_INTERRUPT is not set
+# CONFIG_PROFILER_SLEEP is not set
 
 #
 # Nanokernel Options

arch/x86/core/cpuhalt.S

@@ -84,6 +84,9 @@ SECTION_FUNC(TEXT, nano_cpu_idle)
 #ifdef CONFIG_INT_LATENCY_BENCHMARK
 	call	_int_latency_stop
 #endif
+#ifdef CONFIG_PROFILER_SLEEP
+	call    _sys_profiler_enter_sleep
+#endif
 #if defined(CONFIG_BOOT_TIME_MEASUREMENT)
 	rdtsc			/* record idle timestamp */
 	mov  %eax, __idle_tsc   /* ... low 32 bits  */
@@ -123,6 +126,9 @@ SECTION_FUNC(TEXT, nano_cpu_idle)
 SECTION_FUNC(TEXT, nano_cpu_atomic_idle)
 #ifdef CONFIG_INT_LATENCY_BENCHMARK
 	call	_int_latency_stop
+#endif
+#ifdef CONFIG_PROFILER_SLEEP
+	call    _sys_profiler_enter_sleep
 #endif
 	sti			/* make sure interrupts are enabled */
 

arch/x86/defconfig

@@ -21,6 +21,7 @@ CONFIG_ENHANCED_SECURITY=y
 # CONFIG_PROFILER_BUFFER_SIZE is not set
 # CONFIG_PROFILER_CONTEXT_SWITCH is not set
 # CONFIG_PROFILER_INTERRUPT is not set
+# CONFIG_PROFILER_SLEEP is not set
 
 #
 # Security Options

include/misc/profiler.h

@@ -49,6 +49,10 @@
 #define PROFILER_INTERRUPT_EVENT_ID                  0x0002
 #endif
 
+#ifdef CONFIG_PROFILER_SLEEP
+#define PROFILER_SLEEP_EVENT_ID                      0x0003
+#endif
+
 #ifndef _ASMLANGUAGE
 /**
  * Global variable of the ring buffer that allows user to implement

kernel/Kconfig

@@ -150,6 +150,17 @@ config PROFILER_INTERRUPT
 	Enable interrupt event messages. These messages provide the following
 	information: The time when interrupts occur.
 
+config PROFILER_SLEEP
+	bool
+	prompt "Sleep profiler point"
+	default n
+	depends on KERNEL_PROFILER && ADVANCED_POWER_MANAGEMENT
+	help
+	Enable low power condition event messages. These messages provide the
+	following information:
+		- When the CPU went to sleep mode.
+		- When the CPU woke up.
+		- The ID of the interrupt that woke the CPU up.
 endmenu
 
 menu "Security Options"

kernel/microkernel/k_idle.c

@@ -370,6 +370,10 @@ void _sys_power_save_idle_exit(int32_t ticks)
 #else
 	ARG_UNUSED(ticks);
 #endif /* CONFIG_TICKLESS_IDLE */
+#ifdef CONFIG_PROFILER_SLEEP
+	extern void _sys_profiler_exit_sleep(void);
+	_sys_profiler_exit_sleep();
+#endif
 }
 
 /**

kernel/nanokernel/profiler.c

@@ -46,6 +46,11 @@ uint32_t _sys_profiler_buffer[CONFIG_PROFILER_BUFFER_SIZE];
 void *_collector_fiber=NULL;
 #endif
 
+#ifdef CONFIG_PROFILER_SLEEP
+uint32_t _sys_profiler_sleep_start_time;
+#endif
+
+
 /**
  * @brief Initialize the profiler system.
  *
@@ -134,3 +139,23 @@ void _sys_profiler_interrupt()
 	sys_profiler_put(PROFILER_INTERRUPT_EVENT_ID, data, ARRAY_SIZE(data));
 }
 #endif /* CONFIG_PROFILER_INTERRUPT */
+
+
+#ifdef CONFIG_PROFILER_SLEEP
+void _sys_profiler_enter_sleep(void)
+{
+	_sys_profiler_sleep_start_time = nano_cycle_get_32();
+}
+
+void _sys_profiler_exit_sleep(void)
+{
+	uint32_t data[3];
+
+	data[0] = nano_tick_get_32();
+	data[1] = (nano_cycle_get_32() - _sys_profiler_sleep_start_time) / sys_clock_hw_cycles_per_tick;
+	/* register the cause of exiting sleep mode */
+	data[2] = _sys_current_irq_key_get();
+
+	sys_profiler_put(PROFILER_SLEEP_EVENT_ID, data, ARRAY_SIZE(data));
+}
+#endif /* CONFIG_PROFILER_SLEEP */