u-boot/include/log.h
Tom Rini f51b4bcf61 Functions for reading indexed values from device tree
Enhancements to 'dm' command
 Log test enhancements and syslog driver
 DM change to read parent ofdata before children
 Minor fixes
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Merge tag 'dm-pull-10apr20-take2' of git://git.denx.de/u-boot-dm

Functions for reading indexed values from device tree
Enhancements to 'dm' command
Log test enhancements and syslog driver
DM change to read parent ofdata before children
Minor fixes
2020-04-16 13:45:03 -04:00

460 lines
14 KiB
C

/* 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 <command.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, /* First number is after all uclasses */
LOGC_ARCH, /* Related to arch-specific code */
LOGC_BOARD, /* Related to board-specific code */
LOGC_CORE, /* Related to core features (non-driver-model) */
LOGC_DM, /* Core driver-model */
LOGC_DT, /* Device-tree */
LOGC_EFI, /* EFI implementation */
LOGC_ALLOC, /* Memory allocation */
LOGC_SANDBOX, /* Related to the sandbox board */
LOGC_BLOBLIST, /* Bloblist */
LOGC_DEVRES, /* Device resources (devres_... functions) */
/* Advanced Configuration and Power Interface (ACPI) */
LOGC_ACPI,
LOGC_COUNT, /* Number of log categories */
LOGC_END, /* Sentinel value for a list of log categories */
};
/* 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, ...)
__attribute__ ((format (__printf__, 6, 7)));
static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
const char *file, int line, const char *func,
const char *fmt, ...)
__attribute__ ((format (__printf__, 6, 7)));
static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
const char *file, int line, const char *func,
const char *fmt, ...)
{
return 0;
}
/* 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)
#define log_err(_fmt...) log(LOG_CATEGORY, LOGL_ERR, ##_fmt)
#define log_warning(_fmt...) log(LOG_CATEGORY, LOGL_WARNING, ##_fmt)
#define log_notice(_fmt...) log(LOG_CATEGORY, LOGL_NOTICE, ##_fmt)
#define log_info(_fmt...) log(LOG_CATEGORY, LOGL_INFO, ##_fmt)
#define log_debug(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG, ##_fmt)
#define log_content(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_CONTENT, ##_fmt)
#define log_io(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
#else
#define _LOG_MAX_LEVEL LOGL_INFO
#define log_err(_fmt, ...) printf(_fmt, ##__VA_ARGS__)
#define log_warning(_fmt, ...) printf(_fmt, ##__VA_ARGS__)
#define log_notice(_fmt, ...) printf(_fmt, ##__VA_ARGS__)
#define log_info(_fmt, ...) printf(_fmt, ##__VA_ARGS__)
#define log_debug(_fmt, ...) debug(_fmt, ##__VA_ARGS__)
#define log_content(_fmt...) log_nop(LOG_CATEGORY, \
LOGL_DEBUG_CONTENT, ##_fmt)
#define log_io(_fmt...) log_nop(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
#endif
#if CONFIG_IS_ENABLED(LOG)
#ifdef LOG_DEBUG
#define _LOG_DEBUG 1
#else
#define _LOG_DEBUG 0
#endif
/* Emit a log record if the level is less that the maximum */
#define log(_cat, _level, _fmt, _args...) ({ \
int _l = _level; \
if (CONFIG_IS_ENABLED(LOG) && (_l <= _LOG_MAX_LEVEL || _LOG_DEBUG)) \
_log((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
__func__, \
pr_fmt(_fmt), ##_args); \
})
#else
#define log(_cat, _level, _fmt, _args...)
#endif
#define log_nop(_cat, _level, _fmt, _args...) ({ \
int _l = _level; \
_log_nop((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);
/**
* assert() - assert expression is true
*
* If the expression x evaluates to false and _DEBUG evaluates to true, a panic
* message is written and the system stalls. The value of _DEBUG is set to true
* if DEBUG is defined before including common.h.
*
* The expression x is always executed irrespective of the value of _DEBUG.
*
* @x: expression to test
*/
#define assert(x) \
({ if (!(x) && _DEBUG) \
__assert_fail(#x, __FILE__, __LINE__, __func__); })
/*
* This one actually gets compiled in even without DEBUG. It doesn't include the
* full pathname as it may be huge. Only use this when the user should be
* warning, similar to BUG_ON() in linux.
*
* @return true if assertion succeeded (condition is true), else false
*/
#define assert_noisy(x) \
({ bool _val = (x); \
if (!_val) \
__assert_fail(#x, "?", __LINE__, __func__); \
_val; \
})
#if CONFIG_IS_ENABLED(LOG) && defined(CONFIG_LOG_ERROR_RETURN)
/*
* Log an error return value, possibly with a message. Usage:
*
* return log_ret(fred_call());
*
* or:
*
* return log_msg_ret("fred failed", fred_call());
*/
#define log_ret(_ret) ({ \
int __ret = (_ret); \
if (__ret < 0) \
log(LOG_CATEGORY, LOGL_ERR, "returning err=%d\n", __ret); \
__ret; \
})
#define log_msg_ret(_msg, _ret) ({ \
int __ret = (_ret); \
if (__ret < 0) \
log(LOG_CATEGORY, LOGL_ERR, "%s: returning err=%d\n", _msg, \
__ret); \
__ret; \
})
#else
/* Non-logging versions of the above which just return the error code */
#define log_ret(_ret) (_ret)
#define log_msg_ret(_msg, _ret) ((void)(_msg), _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) if found, or
* "<invalid>" if invalid, or "<missing>" if not found
*/
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