blob: a3edd25546a0505f4a5abf5b8863da7c1116a367 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Logging support
*
* Copyright (c) 2017 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef __LOG_H
#define __LOG_H
#include <dm/uclass-id.h>
#include <linux/list.h>
/** Log levels supported, ranging from most to least important */
enum log_level_t {
LOGL_EMERG = 0, /*U-Boot is unstable */
LOGL_ALERT, /* Action must be taken immediately */
LOGL_CRIT, /* Critical conditions */
LOGL_ERR, /* Error that prevents something from working */
LOGL_WARNING, /* Warning may prevent optimial operation */
LOGL_NOTICE, /* Normal but significant condition, printf() */
LOGL_INFO, /* General information message */
LOGL_DEBUG, /* Basic debug-level message */
LOGL_DEBUG_CONTENT, /* Debug message showing full message content */
LOGL_DEBUG_IO, /* Debug message showing hardware I/O access */
LOGL_COUNT,
LOGL_NONE,
LOGL_FIRST = LOGL_EMERG,
LOGL_MAX = LOGL_DEBUG_IO,
};
/**
* Log categories supported. Most of these correspond to uclasses (i.e.
* enum uclass_id) but there are also some more generic categories
*/
enum log_category_t {
LOGC_FIRST = 0, /* First part mirrors UCLASS_... */
LOGC_NONE = UCLASS_COUNT,
LOGC_ARCH,
LOGC_BOARD,
LOGC_CORE,
LOGC_DM, /* Core driver-model */
LOGC_DT, /* Device-tree */
LOGC_EFI, /* EFI implementation */
LOGC_COUNT,
LOGC_END,
};
/* Helper to cast a uclass ID to a log category */
static inline int log_uc_cat(enum uclass_id id)
{
return (enum log_category_t)id;
}
/**
* _log() - Internal function to emit a new log record
*
* @cat: Category of log record (indicating which subsystem generated it)
* @level: Level of log record (indicating its severity)
* @file: File name of file where log record was generated
* @line: Line number in file where log record was generated
* @func: Function where log record was generated
* @fmt: printf() format string for log record
* @...: Optional parameters, according to the format string @fmt
* @return 0 if log record was emitted, -ve on error
*/
int _log(enum log_category_t cat, enum log_level_t level, const char *file,
int line, const char *func, const char *fmt, ...);
/* Define this at the top of a file to add a prefix to debug messages */
#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif
/* Use a default category if this file does not supply one */
#ifndef LOG_CATEGORY
#define LOG_CATEGORY LOGC_NONE
#endif
/*
* This header may be including when CONFIG_LOG is disabled, in which case
* CONFIG_LOG_MAX_LEVEL is not defined. Add a check for this.
*/
#if CONFIG_IS_ENABLED(LOG)
#define _LOG_MAX_LEVEL CONFIG_VAL(LOG_MAX_LEVEL)
#else
#define _LOG_MAX_LEVEL LOGL_INFO
#endif
/* Emit a log record if the level is less that the maximum */
#define log(_cat, _level, _fmt, _args...) ({ \
int _l = _level; \
if (_l <= _LOG_MAX_LEVEL) \
_log((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
__func__, \
pr_fmt(_fmt), ##_args); \
})
#ifdef DEBUG
#define _DEBUG 1
#else
#define _DEBUG 0
#endif
#ifdef CONFIG_SPL_BUILD
#define _SPL_BUILD 1
#else
#define _SPL_BUILD 0
#endif
#if !_DEBUG && CONFIG_IS_ENABLED(LOG)
#define debug_cond(cond, fmt, args...) \
do { \
if (1) \
log(LOG_CATEGORY, LOGL_DEBUG, fmt, ##args); \
} while (0)
#else /* _DEBUG */
/*
* Output a debug text when condition "cond" is met. The "cond" should be
* computed by a preprocessor in the best case, allowing for the best
* optimization.
*/
#define debug_cond(cond, fmt, args...) \
do { \
if (cond) \
printf(pr_fmt(fmt), ##args); \
} while (0)
#endif /* _DEBUG */
/* Show a message if DEBUG is defined in a file */
#define debug(fmt, args...) \
debug_cond(_DEBUG, fmt, ##args)
/* Show a message if not in SPL */
#define warn_non_spl(fmt, args...) \
debug_cond(!_SPL_BUILD, fmt, ##args)
/*
* An assertion is run-time check done in debug mode only. If DEBUG is not
* defined then it is skipped. If DEBUG is defined and the assertion fails,
* then it calls panic*( which may or may not reset/halt U-Boot (see
* CONFIG_PANIC_HANG), It is hoped that all failing assertions are found
* before release, and after release it is hoped that they don't matter. But
* in any case these failing assertions cannot be fixed with a reset (which
* may just do the same assertion again).
*/
void __assert_fail(const char *assertion, const char *file, unsigned int line,
const char *function);
#define assert(x) \
({ if (!(x) && _DEBUG) \
__assert_fail(#x, __FILE__, __LINE__, __func__); })
#ifdef CONFIG_LOG_ERROR_RETURN
#define log_ret(_ret) ({ \
int __ret = (_ret); \
if (__ret < 0) \
log(LOG_CATEGORY, LOGL_ERR, "returning err=%d\n", __ret); \
__ret; \
})
#else
#define log_ret(_ret) (_ret)
#endif
/**
* struct log_rec - a single log record
*
* Holds information about a single record in the log
*
* Members marked as 'not allocated' are stored as pointers and the caller is
* responsible for making sure that the data pointed to is not overwritten.
* Memebers marked as 'allocated' are allocated (e.g. via strdup()) by the log
* system.
*
* @cat: Category, representing a uclass or part of U-Boot
* @level: Severity level, less severe is higher
* @file: Name of file where the log record was generated (not allocated)
* @line: Line number where the log record was generated
* @func: Function where the log record was generated (not allocated)
* @msg: Log message (allocated)
*/
struct log_rec {
enum log_category_t cat;
enum log_level_t level;
const char *file;
int line;
const char *func;
const char *msg;
};
struct log_device;
/**
* struct log_driver - a driver which accepts and processes log records
*
* @name: Name of driver
*/
struct log_driver {
const char *name;
/**
* emit() - emit a log record
*
* Called by the log system to pass a log record to a particular driver
* for processing. The filter is checked before calling this function.
*/
int (*emit)(struct log_device *ldev, struct log_rec *rec);
};
/**
* struct log_device - an instance of a log driver
*
* Since drivers are set up at build-time we need to have a separate device for
* the run-time aspects of drivers (currently just a list of filters to apply
* to records send to this device).
*
* @next_filter_num: Seqence number of next filter filter added (0=no filters
* yet). This increments with each new filter on the device, but never
* decrements
* @drv: Pointer to driver for this device
* @filter_head: List of filters for this device
* @sibling_node: Next device in the list of all devices
*/
struct log_device {
int next_filter_num;
struct log_driver *drv;
struct list_head filter_head;
struct list_head sibling_node;
};
enum {
LOGF_MAX_CATEGORIES = 5, /* maximum categories per filter */
};
enum log_filter_flags {
LOGFF_HAS_CAT = 1 << 0, /* Filter has a category list */
};
/**
* struct log_filter - criterial to filter out log messages
*
* @filter_num: Sequence number of this filter. This is returned when adding a
* new filter, and must be provided when removing a previously added
* filter.
* @flags: Flags for this filter (LOGFF_...)
* @cat_list: List of categories to allow (terminated by LOGC_none). If empty
* then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
* can be provided
* @max_level: Maximum log level to allow
* @file_list: List of files to allow, separated by comma. If NULL then all
* files are permitted
* @sibling_node: Next filter in the list of filters for this log device
*/
struct log_filter {
int filter_num;
int flags;
enum log_category_t cat_list[LOGF_MAX_CATEGORIES];
enum log_level_t max_level;
const char *file_list;
struct list_head sibling_node;
};
#define LOG_DRIVER(_name) \
ll_entry_declare(struct log_driver, _name, log_driver)
/**
* log_get_cat_name() - Get the name of a category
*
* @cat: Category to look up
* @return category name (which may be a uclass driver name)
*/
const char *log_get_cat_name(enum log_category_t cat);
/**
* log_get_cat_by_name() - Look up a category by name
*
* @name: Name to look up
* @return category ID, or LOGC_NONE if not found
*/
enum log_category_t log_get_cat_by_name(const char *name);
/**
* log_get_level_name() - Get the name of a log level
*
* @level: Log level to look up
* @return log level name (in ALL CAPS)
*/
const char *log_get_level_name(enum log_level_t level);
/**
* log_get_level_by_name() - Look up a log level by name
*
* @name: Name to look up
* @return log level ID, or LOGL_NONE if not found
*/
enum log_level_t log_get_level_by_name(const char *name);
/* Log format flags (bit numbers) for gd->log_fmt. See log_fmt_chars */
enum log_fmt {
LOGF_CAT = 0,
LOGF_LEVEL,
LOGF_FILE,
LOGF_LINE,
LOGF_FUNC,
LOGF_MSG,
LOGF_COUNT,
LOGF_DEFAULT = (1 << LOGF_FUNC) | (1 << LOGF_MSG),
LOGF_ALL = 0x3f,
};
/* Handle the 'log test' command */
int do_log_test(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]);
/**
* log_add_filter() - Add a new filter to a log device
*
* @drv_name: Driver name to add the filter to (since each driver only has a
* single device)
* @cat_list: List of categories to allow (terminated by LOGC_none). If empty
* then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
* can be provided
* @max_level: Maximum log level to allow
* @file_list: List of files to allow, separated by comma. If NULL then all
* files are permitted
* @return the sequence number of the new filter (>=0) if the filter was added,
* or a -ve value on error
*/
int log_add_filter(const char *drv_name, enum log_category_t cat_list[],
enum log_level_t max_level, const char *file_list);
/**
* log_remove_filter() - Remove a filter from a log device
*
* @drv_name: Driver name to remove the filter from (since each driver only has
* a single device)
* @filter_num: Filter number to remove (as returned by log_add_filter())
* @return 0 if the filter was removed, -ENOENT if either the driver or the
* filter number was not found
*/
int log_remove_filter(const char *drv_name, int filter_num);
#if CONFIG_IS_ENABLED(LOG)
/**
* log_init() - Set up the log system ready for use
*
* @return 0 if OK, -ENOMEM if out of memory
*/
int log_init(void);
#else
static inline int log_init(void)
{
return 0;
}
#endif
#endif