387 lines
13 KiB
C
387 lines
13 KiB
C
/*
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* Copyright Runtime.io 2018. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Statistics.
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*
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* Statistics are per-module event counters for troubleshooting, maintenance,
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* and usage monitoring. Statistics are organized into named "groups", with
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* each group consisting of a set of "entries". An entry corresponds to an
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* individual counter. Each entry can optionally be named if the STATS_NAMES
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* setting is enabled. Statistics can be retrieved with the mcumgr management
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* subsystem.
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*
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* There are two, largely duplicated, statistics sections here, in order to
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* provide the optional ability to name statistics.
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*
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* STATS_SECT_START/END actually declare the statistics structure definition,
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* STATS_SECT_DECL() creates the structure declaration so you can declare
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* these statistics as a global structure, and STATS_NAME_START/END are how
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* you name the statistics themselves.
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*
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* Statistics entries can be declared as any of several integer types.
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* However, all statistics in a given structure must be of the same size, and
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* they are all unsigned.
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*
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* - STATS_SECT_ENTRY(): default statistic entry, 32-bits.
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*
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* - STATS_SECT_ENTRY16(): 16-bits. Smaller statistics if you need to fit into
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* specific RAM or code size numbers.
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*
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* - STATS_SECT_ENTRY32(): 32-bits.
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*
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* - STATS_SECT_ENTRY64(): 64-bits. Useful for storing chunks of data.
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*
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* Following the static entry declaration is the statistic names declaration.
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* This is compiled out when the CONFIGURE_STATS_NAME setting is undefined.
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*
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* When CONFIG_STATS_NAMES is defined, the statistics names are stored and
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* returned to the management APIs. When the setting is undefined, temporary
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* names are generated as needed with the following format:
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*
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* s<stat-idx>
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*
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* E.g., "s0", "s1", etc.
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*/
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#ifndef ZEPHYR_INCLUDE_STATS_H_
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#define ZEPHYR_INCLUDE_STATS_H_
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#include <stddef.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct stats_name_map {
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u16_t snm_off;
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const char *snm_name;
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} __packed;
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struct stats_hdr {
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const char *s_name;
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u8_t s_size;
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u8_t s_cnt;
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u16_t s_pad1;
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#ifdef CONFIG_STATS_NAMES
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const struct stats_name_map *s_map;
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int s_map_cnt;
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#endif
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struct stats_hdr *s_next;
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};
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/**
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* @brief Declares a stat group struct.
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*
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* @param group__ The name to assign to the structure tag.
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*/
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#define STATS_SECT_DECL(group__) \
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struct stats_ ## group__
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/**
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* @brief Ends a stats group struct definition.
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*/
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#define STATS_SECT_END }
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/* The following macros depend on whether CONFIG_STATS is defined. If it is
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* not defined, then invocations of these macros get compiled out.
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*/
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#ifdef CONFIG_STATS
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/**
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* @brief Begins a stats group struct definition.
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*
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* @param group__ The stats group struct name.
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*/
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#define STATS_SECT_START(group__) \
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STATS_SECT_DECL(group__) { \
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struct stats_hdr s_hdr;
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/**
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* @brief Declares a 32-bit stat entry inside a group struct.
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*
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* @param var__ The name to assign to the entry.
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*/
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#define STATS_SECT_ENTRY(var__) u32_t var__;
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/**
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* @brief Declares a 16-bit stat entry inside a group struct.
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*
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* @param var__ The name to assign to the entry.
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*/
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#define STATS_SECT_ENTRY16(var__) u16_t var__;
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/**
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* @brief Declares a 32-bit stat entry inside a group struct.
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*
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* @param var__ The name to assign to the entry.
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*/
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#define STATS_SECT_ENTRY32(var__) u32_t var__;
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/**
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* @brief Declares a 64-bit stat entry inside a group struct.
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*
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* @param var__ The name to assign to the entry.
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*/
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#define STATS_SECT_ENTRY64(var__) u64_t var__;
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/**
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* @brief Increases a statistic entry by the specified amount.
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*
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* Increases a statistic entry by the specified amount. Compiled out if
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* CONFIG_STATS is not defined.
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*
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* @param group__ The group containing the entry to increase.
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* @param var__ The statistic entry to increase.
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* @param n__ The amount to increase the statistic entry by.
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*/
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#define STATS_INCN(group__, var__, n__) \
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((group__).var__ += (n__))
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/**
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* @brief Increments a statistic entry.
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*
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* Increments a statistic entry by one. Compiled out if CONFIG_STATS is not
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* defined.
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*
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* @param group__ The group containing the entry to increase.
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* @param var__ The statistic entry to increase.
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*/
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#define STATS_INC(group__, var__) \
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STATS_INCN(group__, var__, 1)
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/**
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* @brief Sets a statistic entry to zero.
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*
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* Sets a statistic entry to zero. Compiled out if CONFIG_STATS is not
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* defined.
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*
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* @param group__ The group containing the entry to clear.
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* @param var__ The statistic entry to clear.
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*/
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#define STATS_CLEAR(group__, var__) \
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((group__).var__ = 0)
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#define STATS_SIZE_16 (sizeof(u16_t))
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#define STATS_SIZE_32 (sizeof(u32_t))
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#define STATS_SIZE_64 (sizeof(u64_t))
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#define STATS_SIZE_INIT_PARMS(group__, size__) \
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(size__), \
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((sizeof(group__)) - sizeof(struct stats_hdr)) / (size__)
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/**
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* @brief Initializes and registers a statistics group.
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*
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* @param group__ The statistics group to initialize and
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* register.
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* @param size__ The size of each entry in the statistics group,
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* in bytes. Must be one of: 2 (16-bits), 4
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* (32-bits) or 8 (64-bits).
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* @param name__ The name of the statistics group to register.
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* This name must be unique among all
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* statistics groups.
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*
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* @return 0 on success; negative error code on failure.
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*/
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#define STATS_INIT_AND_REG(group__, size__, name__) \
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stats_init_and_reg( \
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&(group__).s_hdr, \
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(size__), \
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(sizeof(group__) - sizeof(struct stats_hdr)) / (size__), \
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STATS_NAME_INIT_PARMS(group__), \
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(name__))
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/**
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* @brief Initializes a statistics group.
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*
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* @param hdr The header of the statistics structure,
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* contains things like statistic section
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* name, size of statistics entries, number of
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* statistics, etc.
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* @param size The size of each individual statistics
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* element, in bytes. Must be one of: 2
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* (16-bits), 4 (32-bits) or 8 (64-bits).
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* @param cnt The number of elements in the stats group.
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* @param map The mapping of stat offset to name.
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* @param map_cnt The number of items in the statistics map
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*
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* @param group__ The group containing the entry to clear.
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* @param var__ The statistic entry to clear.
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*/
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void stats_init(struct stats_hdr *shdr, uint8_t size, uint8_t cnt,
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const struct stats_name_map *map, uint8_t map_cnt);
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/**
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* @brief Registers a statistics group to be managed.
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*
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* @param name The name of the statistics group to register.
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* This name must be unique among all
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* statistics groups. If the name is a
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* duplicate, this function will return
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* -EALREADY.
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* @param shdr The statistics group to register.
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*
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* @return 0 on success, non-zero error code on failure.
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*/
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int stats_register(const char *name, struct stats_hdr *shdr);
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/**
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* @brief Initializes and registers a statistics group.
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*
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* Initializes and registers a statistics group. Note: it is recommended to
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* use the STATS_INIT_AND_REG macro instead of this function.
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*
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* @param hdr The header of the statistics group to
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* initialize and register.
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* @param size The size of each individual statistics
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* element, in bytes. Must be one of: 2
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* (16-bits), 4 (32-bits) or 8 (64-bits).
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* @param cnt The number of elements in the stats group.
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* @param map The mapping of stat offset to name.
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* @param map_cnt The number of items in the statistics map
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* @param name The name of the statistics group to register.
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* This name must be unique among all
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* statistics groups. If the name is a
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* duplicate, this function will return
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* -EALREADY.
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*
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* @return 0 on success; negative error code on failure.
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*
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* @see STATS_INIT_AND_REG
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*/
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int stats_init_and_reg(struct stats_hdr *hdr, uint8_t size, uint8_t cnt,
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const struct stats_name_map *map, uint8_t map_cnt,
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const char *name);
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/**
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* Zeroes the specified statistics group.
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*
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* @param shdr The statistics group to clear.
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*/
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void stats_reset(struct stats_hdr *shdr);
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/** @typedef stats_walk_fn
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* @brief Function that gets applied to every stat entry during a walk.
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*
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* @param hdr The group containing the stat entry being
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* walked.
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* @param arg Optional argument.
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* @param name The name of the statistic entry to process
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* @param off The offset of the entry, from `hdr`.
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*
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* @return 0 if the walk should proceed;
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* nonzero to abort the walk.
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*/
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typedef int stats_walk_fn(struct stats_hdr *hdr, void *arg,
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const char *name, uint16_t off);
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/**
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* @brief Applies a function to every stat entry in a group.
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*
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* @param hdr The stats group to operate on.
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* @param walk_cb The function to apply to each stat entry.
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* @param arg Optional argument to pass to the callback.
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*
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* @return 0 if the walk completed;
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* nonzero if the walk was aborted.
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*/
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int stats_walk(struct stats_hdr *hdr, stats_walk_fn *walk_cb, void *arg);
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/** @typedef stats_group_walk_fn
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* @brief Function that gets applied to every registered stats group.
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*
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* @param hdr The stats group being walked.
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* @param arg Optional argument.
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*
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* @return 0 if the walk should proceed;
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* nonzero to abort the walk.
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*/
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typedef int stats_group_walk_fn(struct stats_hdr *hdr, void *arg);
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/**
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* @brief Applies a function every registered statistics group.
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*
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* @param walk_cb The function to apply to each stat group.
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* @param arg Optional argument to pass to the callback.
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*
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* @return 0 if the walk completed;
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* nonzero if the walk was aborted.
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*/
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int stats_group_walk(stats_group_walk_fn *walk_cb, void *arg);
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/**
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* @brief Retrieves the next registered statistics group.
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*
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* @param cur The group whose successor is being retrieved, or
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* NULL to retrieve the first group.
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*
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* @return Pointer to the retrieved group on success;
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* NULL if no more groups remain.
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*/
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struct stats_hdr *stats_group_get_next(const struct stats_hdr *cur);
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/**
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* @brief Retrieves the statistics group with the specified name.
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*
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* @param name The name of the statistics group to look up.
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*
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* @return Pointer to the retrieved group on success;
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* NULL if there is no matching registered group.
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*/
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struct stats_hdr *stats_group_find(const char *name);
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#else /* CONFIG_STATS */
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#define STATS_SECT_START(group__) \
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STATS_SECT_DECL(group__) {
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#define STATS_SECT_ENTRY(var__)
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#define STATS_SECT_ENTRY16(var__)
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#define STATS_SECT_ENTRY32(var__)
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#define STATS_SECT_ENTRY64(var__)
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#define STATS_RESET(var__)
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#define STATS_SIZE_INIT_PARMS(group__, size__)
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#define STATS_INCN(group__, var__, n__)
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#define STATS_INC(group__, var__)
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#define STATS_CLEAR(group__, var__)
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#define STATS_INIT_AND_REG(group__, size__, name__) (0)
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#endif /* !CONFIG_STATS */
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#ifdef CONFIG_STATS_NAMES
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#define STATS_NAME_MAP_NAME(sectname__) stats_map_ ## sectname__
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#define STATS_NAME_START(sectname__) \
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const struct stats_name_map STATS_NAME_MAP_NAME(sectname__)[] = {
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#define STATS_NAME(sectname__, entry__) \
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{ offsetof(STATS_SECT_DECL(sectname__), entry__), #entry__ },
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#define STATS_NAME_END(sectname__) }
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#define STATS_NAME_INIT_PARMS(name__) \
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&(STATS_NAME_MAP_NAME(name__)[0]), \
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(sizeof(STATS_NAME_MAP_NAME(name__)) / sizeof(struct stats_name_map))
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#else /* CONFIG_STATS_NAMES */
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#define STATS_NAME_START(name__)
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#define STATS_NAME(name__, entry__)
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#define STATS_NAME_END(name__)
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#define STATS_NAME_INIT_PARMS(name__) NULL, 0
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#endif /* CONFIG_STATS_NAMES */
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_INCLUDE_STATS_H_ */
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