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/*
* Copyright (c) 2015 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file
* @brief Event logger support.
*/
#ifndef __EVENT_LOGGER_H__
#define __EVENT_LOGGER_H__
#ifdef __cplusplus
extern "C" {
#endif
#define EVENT_HEADER_SIZE 1
#ifndef _ASMLANGUAGE
#include <nanokernel.h>
#include <errno.h>
#include <misc/ring_buffer.h>
struct event_logger {
struct nano_sem sync_sema;
struct ring_buf ring_buf;
};
/**
* @brief Event Logger
* @defgroup event_logger Event Logger
* @{
*/
/**
* @brief Initialize the event logger.
*
* @details This routine initializes the ring buffer.
*
* @param logger Logger to be initialized.
* @param logger_buffer Pointer to the buffer to be used by the logger.
* @param buffer_size Size of the buffer in 32-bit words.
*
* @return N/A
*/
void sys_event_logger_init(struct event_logger *logger,
uint32_t *logger_buffer, uint32_t buffer_size);
/**
* @brief Send an event message to the logger.
*
* @details This routine adds an event message to the ring buffer and signals
* the sync semaphore to indicate that event messages are available.
*
* @param logger Pointer to the event logger used.
* @param event_id The profiler event's ID.
* @param event_data Pointer to the data of the message.
* @param data_size Size of the buffer in 32-bit words.
*
* @return N/A
*/
void sys_event_logger_put(struct event_logger *logger, uint16_t event_id,
uint32_t *event_data, uint8_t data_size);
/**
* @brief Retrieve an event message from the logger.
*
* @details This routine retrieves an event message from the ring buffer and
* copies it to the provided buffer. If the provided buffer is smaller
* than the message size the function returns -EMSGSIZE. Otherwise, it returns
* the number of 32-bit words copied. The function retrieves messages in
* FIFO order. If there is no message in the buffer the function returns
* immediately. It can only be called from a fiber.
*
* @param logger Pointer to the event logger used.
* @param event_id Pointer to the id of the fetched event.
* @param dropped_event_count Pointer to the number of events dropped.
* @param buffer Pointer to the buffer for the copied message.
* @param buffer_size Size of the buffer in 32-bit words. Updated with the
* actual message's size.
*
* @retval EMSGSIZE If the buffer size is smaller than the message size.
* @retval Number of 32-bit words copied.
* @retval 0 If no message was already available.
*/
int sys_event_logger_get(struct event_logger *logger, uint16_t *event_id,
uint8_t *dropped_event_count, uint32_t *buffer,
uint8_t *buffer_size);
/**
* @brief Retrieve an event message from the logger, wait if empty.
*
* @details This routine retrieves an event message from the ring buffer
* and copies it to the provided buffer. If the provided buffer is smaller
* than the message size the function returns -EMSGSIZE. Otherwise, it
* returns the number of 32-bit words copied.
*
* The function retrieves messages in FIFO order. The caller pends if there is
* no message available in the buffer. It can only be called from a fiber.
*
* @param logger Pointer to the event logger used.
* @param event_id Pointer to the ID of the fetched event.
* @param dropped_event_count Pointer to the number of dropped events.
* @param buffer Pointer to the buffer for the copied messages.
* @param buffer_size Size of the buffer in 32-bit words. Updated with the
* actual message's size.
*
* @retval EMSGSIZE If the buffer size is smaller than the message size.
* @retval Number of DWORDs copied, otherwise.
*/
int sys_event_logger_get_wait(struct event_logger *logger, uint16_t *event_id,
uint8_t *dropped_event_count, uint32_t *buffer,
uint8_t *buffer_size);
#ifdef CONFIG_NANO_TIMEOUTS
/**
* @brief Retrieve an event message from the logger, wait with a timeout if
* empty.
*
* @details This routine retrieves an event message from the ring buffer and
* copies it to the provided buffer. If the provided buffer is smaller than
* the message size the routine returns -EMSGSIZE. Otherwise, it returns the
* number of dwords copied. The function retrieves messages in FIFO order.
* If no message is available in the buffer, the caller pends until a
* new message is added or the timeout expires. This routine can only be
* called from a fiber.
*
* @param logger Pointer to the event logger used.
* @param event_id Pointer to the ID of the event fetched.
* @param dropped_event_count Pointer to the number of dropped events.
* @param buffer Pointer to the buffer for the copied message.
* @param buffer_size Size of the buffer in 32-bit words. Updated with the
* actual message size.
* @param timeout Timeout in ticks.
*
* @retval EMSGSIZE if the buffer size is smaller than the message size.
* @retval Number of 32-bit words copied.
* @retval 0 If the timeout expired and there was no message already
* available.
*/
int sys_event_logger_get_wait_timeout(struct event_logger *logger,
uint16_t *event_id,
uint8_t *dropped_event_count,
uint32_t *buffer, uint8_t *buffer_size,
uint32_t timeout);
/**
* @}
*/
#endif /* CONFIG_NANO_TIMEOUTS */
#endif /* _ASMLANGUAGE */
#ifdef __cplusplus
}
#endif
#endif /* __EVENT_LOGGER_H__ */