subsys/tracing/include/tracing_buffer.h

/*
 * Copyright (c) 2019 Intel corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef _TRACE_BUFFER_H
#define _TRACE_BUFFER_H

#include <stdbool.h>
#include <zephyr/types.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Initialize tracing buffer.
 */
void tracing_buffer_init(void);

/**
 * @brief Tracing buffer is empty or not.
 *
 * @return true if the ring buffer is empty, or false if not.
 */
bool tracing_buffer_is_empty(void);

/**
 * @brief Get free space in the tracing buffer.
 *
 * @return Tracing buffer free space (in bytes).
 */
u32_t tracing_buffer_space_get(void);

/**
 * @brief Get tracing buffer capacity (max size).
 *
 * @return Tracing buffer capacity (in bytes).
 */
u32_t tracing_buffer_capacity_get(void);

/**
 * @brief Try to allocate buffer in the tracing buffer.
 *
 * @param data Pointer to the address. It's set to a location
 *             within the tracing buffer.
 * @param size Requested buffer size (in bytes).
 *
 * @return Size of allocated buffer which can be smaller than
 *         requested if there isn't enough free space or buffer wraps.
 */
u32_t tracing_buffer_put_claim(u8_t **data, u32_t size);

/**
 * @brief Indicate number of bytes written to the allocated buffer.
 *
 * @param size Number of bytes written to the allocated buffer.
 *
 * @retval 0 Successful operation.
 * @retval -EINVAL Given @a size exceeds free space of tracing buffer.
 */
int tracing_buffer_put_finish(u32_t size);

/**
 * @brief Write data to tracing buffer.
 *
 * @param data Address of data.
 * @param size Data size (in bytes).
 *
 * @retval Number of bytes written to tracing buffer.
 */
u32_t tracing_buffer_put(u8_t *data, u32_t size);

/**
 * @brief Get address of the first valid data in tracing buffer.
 *
 * @param data Pointer to the address. It's set to a location pointing to
 *             the first valid data within the tracing buffer.
 * @param size Requested buffer size (in bytes).
 *
 * @return Size of valid buffer which can be smaller than requested
 *         if there isn't enough valid data or buffer wraps.
 */
u32_t tracing_buffer_get_claim(u8_t **data, u32_t size);

/**
 * @brief Indicate number of bytes read from claimed buffer.
 *
 * @param size Number of bytes read from claimed buffer.
 *
 * @retval 0 Successful operation.
 * @retval -EINVAL Given @a size exceeds available data of tracing buffer.
 */
int tracing_buffer_get_finish(u32_t size);

/**
 * @brief Read data from tracing buffer to output buffer.
 *
 * @param data Address of the output buffer.
 * @param size Data size (in bytes).
 *
 * @retval Number of bytes written to the output buffer.
 */
u32_t tracing_buffer_get(u8_t *data, u32_t size);

/**
 * @brief Get buffer from tracing command buffer.
 *
 * @param data Pointer to tracing command buffer start address.
 *
 * @return Tracing command buffer size (in bytes).
 */
u32_t tracing_cmd_buffer_alloc(u8_t **data);

#ifdef __cplusplus
}
#endif

#endif