148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* @file
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* @brief Profiler support.
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*/
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#include <misc/profiler.h>
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#include <misc/util.h>
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#include <init.h>
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#include <nano_private.h>
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#include <profiler_arch.h>
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uint32_t _sys_profiler_buffer[CONFIG_PROFILER_BUFFER_SIZE];
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#ifdef CONFIG_PROFILER_CONTEXT_SWITCH
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void *_collector_fiber = NULL;
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#endif
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#ifdef CONFIG_PROFILER_SLEEP
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uint32_t _sys_profiler_sleep_start_time;
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#endif
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/**
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* @brief Initialize the profiler system.
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*
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* @details Initialize the ring buffer and the sync semaphore.
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*
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* @return No return value.
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*/
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static int _sys_profiler_init(struct device *arg)
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{
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ARG_UNUSED(arg);
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sys_event_logger_init(&sys_profiler_logger, _sys_profiler_buffer,
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CONFIG_PROFILER_BUFFER_SIZE);
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return 0;
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}
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DECLARE_DEVICE_INIT_CONFIG(profiler_0, "", _sys_profiler_init, NULL);
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nano_early_init(profiler_0, NULL);
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void sys_profiler_put_timed(uint16_t event_id)
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{
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uint32_t data[1];
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data[0] = nano_tick_get_32();
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sys_event_logger_put(&sys_profiler_logger, event_id, data,
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ARRAY_SIZE(data));
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}
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#ifdef CONFIG_PROFILER_CONTEXT_SWITCH
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void _sys_profiler_context_switch(void)
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{
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extern tNANO _nanokernel;
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uint32_t data[2];
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extern void _sys_event_logger_put_non_preemptible(
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struct event_logger *logger, uint16_t event_id, uint32_t *event_data,
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uint8_t data_size);
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/* if the profiler has not been initialized, we do nothing */
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if (sys_profiler_logger.ring_buf.buf == NULL) {
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return;
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}
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if (_collector_fiber != _nanokernel.current) {
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data[0] = nano_tick_get_32();
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data[1] = (uint32_t)_nanokernel.current;
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/*
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* The mechanism we use to log the profile events uses a sync semaphore
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* to inform that there are available events to be collected. The
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* context switch event can be triggered from a task. When we
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* signal a semaphore from a task and a fiber is waiting for
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* that semaphore, a context switch is generated immediately. Due to
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* the fact that we register the context switch event while the context
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* switch is being processed, a new context switch can be generated
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* before the kernel finishes processing the current context switch. We
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* need to prevent this because the kernel is not able to handle it.
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* The _sem_give_non_preemptible function does not trigger a context
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* switch when we signal the semaphore from any type of thread. Using
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* _sys_event_logger_put_non_preemptible function, that internally uses
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* _sem_give_non_preemptible function for signaling the sync semaphore,
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* allow us registering the context switch event without triggering any
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* new context switch during the process.
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*/
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_sys_event_logger_put_non_preemptible(&sys_profiler_logger,
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PROFILER_CONTEXT_SWITCH_EVENT_ID, data, ARRAY_SIZE(data));
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}
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}
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void sys_profiler_register_as_collector(void)
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{
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_collector_fiber = _nanokernel.current;
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}
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#endif /* CONFIG_PROFILER_CONTEXT_SWITCH */
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#ifdef CONFIG_PROFILER_INTERRUPT
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void _sys_profiler_interrupt(void)
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{
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uint32_t data[2];
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data[0] = nano_tick_get_32();
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data[1] = _sys_current_irq_key_get();
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sys_profiler_put(PROFILER_INTERRUPT_EVENT_ID, data, ARRAY_SIZE(data));
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}
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#endif /* CONFIG_PROFILER_INTERRUPT */
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#ifdef CONFIG_PROFILER_SLEEP
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void _sys_profiler_enter_sleep(void)
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{
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_sys_profiler_sleep_start_time = nano_cycle_get_32();
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}
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void _sys_profiler_exit_sleep(void)
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{
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uint32_t data[3];
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data[0] = nano_tick_get_32();
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data[1] = (nano_cycle_get_32() - _sys_profiler_sleep_start_time) / sys_clock_hw_cycles_per_tick;
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/* register the cause of exiting sleep mode */
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data[2] = _sys_current_irq_key_get();
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sys_profiler_put(PROFILER_SLEEP_EVENT_ID, data, ARRAY_SIZE(data));
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}
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#endif /* CONFIG_PROFILER_SLEEP */
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