[thirdparty/u-boot.git] / include / log.h

/* 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 <stdio.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
Commit	Line	Data
83d290c5	1	/* SPDX-License-Identifier: GPL-2.0+ */
0e98b0a6 SG	2	/*
	3	* Logging support
	4	*
	5	* Copyright (c) 2017 Google, Inc
	6	* Written by Simon Glass <sjg@chromium.org>
0e98b0a6 SG	7	*/
	8
	9	#ifndef __LOG_H
	10	#define __LOG_H
	11
90526e9f	12	#include <stdio.h>
aaa05deb	13	#include <command.h>
e9c8d49d SG	14	#include <dm/uclass-id.h>
	15	#include <linux/list.h>
	16
	17	/** Log levels supported, ranging from most to least important */
	18	enum log_level_t {
6fc7e938	19	LOGL_EMERG = 0, /* U-Boot is unstable */
e9c8d49d SG	20	LOGL_ALERT, /* Action must be taken immediately */
	21	LOGL_CRIT, /* Critical conditions */
	22	LOGL_ERR, /* Error that prevents something from working */
	23	LOGL_WARNING, /* Warning may prevent optimial operation */
	24	LOGL_NOTICE, /* Normal but significant condition, printf() */
	25	LOGL_INFO, /* General information message */
	26	LOGL_DEBUG, /* Basic debug-level message */
	27	LOGL_DEBUG_CONTENT, /* Debug message showing full message content */
	28	LOGL_DEBUG_IO, /* Debug message showing hardware I/O access */
	29
	30	LOGL_COUNT,
f941c8d7 SG	31	LOGL_NONE,
f941c8d7 SG	32
e9c8d49d	33	LOGL_FIRST = LOGL_EMERG,
f941c8d7	34	LOGL_MAX = LOGL_DEBUG_IO,
e9c8d49d SG	35	};
	36
	37	/**
	38	* Log categories supported. Most of these correspond to uclasses (i.e.
	39	* enum uclass_id) but there are also some more generic categories
	40	*/
	41	enum log_category_t {
	42	LOGC_FIRST = 0, /* First part mirrors UCLASS_... */
	43
0bf96459 SG	44	LOGC_NONE = UCLASS_COUNT, /* First number is after all uclasses */
	45	LOGC_ARCH, /* Related to arch-specific code */
	46	LOGC_BOARD, /* Related to board-specific code */
	47	LOGC_CORE, /* Related to core features (non-driver-model) */
f941c8d7 SG	48	LOGC_DM, /* Core driver-model */
f941c8d7 SG	49	LOGC_DT, /* Device-tree */
d8d8997b	50	LOGC_EFI, /* EFI implementation */
c3aed5db	51	LOGC_ALLOC, /* Memory allocation */
a5c13b68	52	LOGC_SANDBOX, /* Related to the sandbox board */
9f407d4e	53	LOGC_BLOBLIST, /* Bloblist */
cce61fc4	54	LOGC_DEVRES, /* Device resources (devres_... functions) */
7ca2850c SG	55	/* Advanced Configuration and Power Interface (ACPI) */
7ca2850c SG	56	LOGC_ACPI,
e9c8d49d	57
0bf96459 SG	58	LOGC_COUNT, /* Number of log categories */
0bf96459 SG	59	LOGC_END, /* Sentinel value for a list of log categories */
e9c8d49d SG	60	};
	61
	62	/* Helper to cast a uclass ID to a log category */
	63	static inline int log_uc_cat(enum uclass_id id)
	64	{
	65	return (enum log_category_t)id;
	66	}
	67
	68	/**
	69	* _log() - Internal function to emit a new log record
	70	*
	71	* @cat: Category of log record (indicating which subsystem generated it)
	72	* @level: Level of log record (indicating its severity)
	73	* @file: File name of file where log record was generated
	74	* @line: Line number in file where log record was generated
	75	* @func: Function where log record was generated
	76	* @fmt: printf() format string for log record
	77	* @...: Optional parameters, according to the format string @fmt
	78	* @return 0 if log record was emitted, -ve on error
	79	*/
	80	int _log(enum log_category_t cat, enum log_level_t level, const char *file,
ed4e933d SG	81	int line, const char func, const char fmt, ...)
ed4e933d SG	82	__attribute__ ((format (__printf__, 6, 7)));
e9c8d49d	83
fd42948f SG	84	static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
	85	const char file, int line, const char func,
	86	const char *fmt, ...)
	87	__attribute__ ((format (__printf__, 6, 7)));
	88
	89	static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
	90	const char file, int line, const char func,
	91	const char *fmt, ...)
	92	{
	93	return 0;
	94	}
	95
e9c8d49d SG	96	/* Define this at the top of a file to add a prefix to debug messages */
	97	#ifndef pr_fmt
	98	#define pr_fmt(fmt) fmt
	99	#endif
	100
	101	/* Use a default category if this file does not supply one */
	102	#ifndef LOG_CATEGORY
	103	#define LOG_CATEGORY LOGC_NONE
	104	#endif
	105
	106	/*
	107	* This header may be including when CONFIG_LOG is disabled, in which case
	108	* CONFIG_LOG_MAX_LEVEL is not defined. Add a check for this.
	109	*/
	110	#if CONFIG_IS_ENABLED(LOG)
	111	#define _LOG_MAX_LEVEL CONFIG_VAL(LOG_MAX_LEVEL)
cdd140af SG	112	#define log_err(_fmt...) log(LOG_CATEGORY, LOGL_ERR, ##_fmt)
	113	#define log_warning(_fmt...) log(LOG_CATEGORY, LOGL_WARNING, ##_fmt)
	114	#define log_notice(_fmt...) log(LOG_CATEGORY, LOGL_NOTICE, ##_fmt)
	115	#define log_info(_fmt...) log(LOG_CATEGORY, LOGL_INFO, ##_fmt)
	116	#define log_debug(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG, ##_fmt)
	117	#define log_content(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_CONTENT, ##_fmt)
	118	#define log_io(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
e9c8d49d SG	119	#else
e9c8d49d SG	120	#define _LOG_MAX_LEVEL LOGL_INFO
20fd256d HS	121	#define log_err(_fmt, ...) printf(_fmt, ##__VA_ARGS__)
	122	#define log_warning(_fmt, ...) printf(_fmt, ##__VA_ARGS__)
	123	#define log_notice(_fmt, ...) printf(_fmt, ##__VA_ARGS__)
	124	#define log_info(_fmt, ...) printf(_fmt, ##__VA_ARGS__)
	125	#define log_debug(_fmt, ...) debug(_fmt, ##__VA_ARGS__)
fd42948f SG	126	#define log_content(_fmt...) log_nop(LOG_CATEGORY, \
	127	LOGL_DEBUG_CONTENT, ##_fmt)
	128	#define log_io(_fmt...) log_nop(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
e9c8d49d SG	129	#endif
e9c8d49d SG	130
4d8d3056	131	#if CONFIG_IS_ENABLED(LOG)
f9811e85 SG	132	#ifdef LOG_DEBUG
	133	#define _LOG_DEBUG 1
	134	#else
	135	#define _LOG_DEBUG 0
	136	#endif
4d8d3056	137
e9c8d49d SG	138	/* Emit a log record if the level is less that the maximum */
	139	#define log(_cat, _level, _fmt, _args...) ({ \
	140	int _l = _level; \
f9811e85	141	if (CONFIG_IS_ENABLED(LOG) && (_l <= _LOG_MAX_LEVEL \|\| _LOG_DEBUG)) \
e9c8d49d SG	142	_log((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
	143	__func__, \
	144	pr_fmt(_fmt), ##_args); \
	145	})
4d8d3056 SG	146	#else
	147	#define log(_cat, _level, _fmt, _args...)
	148	#endif
e9c8d49d	149
fd42948f SG	150	#define log_nop(_cat, _level, _fmt, _args...) ({ \
	151	int _l = _level; \
	152	_log_nop((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
	153	__func__, pr_fmt(_fmt), ##_args); \
	154	})
	155
0e98b0a6 SG	156	#ifdef DEBUG
	157	#define _DEBUG 1
	158	#else
	159	#define _DEBUG 0
	160	#endif
	161
	162	#ifdef CONFIG_SPL_BUILD
	163	#define _SPL_BUILD 1
	164	#else
	165	#define _SPL_BUILD 0
	166	#endif
	167
e9c8d49d SG	168	#if !_DEBUG && CONFIG_IS_ENABLED(LOG)
	169
	170	#define debug_cond(cond, fmt, args...) \
	171	do { \
	172	if (1) \
	173	log(LOG_CATEGORY, LOGL_DEBUG, fmt, ##args); \
	174	} while (0)
	175
	176	#else /* _DEBUG */
	177
0e98b0a6 SG	178	/*
	179	* Output a debug text when condition "cond" is met. The "cond" should be
	180	* computed by a preprocessor in the best case, allowing for the best
	181	* optimization.
	182	*/
	183	#define debug_cond(cond, fmt, args...) \
	184	do { \
	185	if (cond) \
	186	printf(pr_fmt(fmt), ##args); \
	187	} while (0)
	188
e9c8d49d SG	189	#endif /* _DEBUG */
e9c8d49d SG	190
0e98b0a6 SG	191	/* Show a message if DEBUG is defined in a file */
	192	#define debug(fmt, args...) \
	193	debug_cond(_DEBUG, fmt, ##args)
	194
	195	/* Show a message if not in SPL */
	196	#define warn_non_spl(fmt, args...) \
	197	debug_cond(!_SPL_BUILD, fmt, ##args)
	198
	199	/*
	200	* An assertion is run-time check done in debug mode only. If DEBUG is not
	201	* defined then it is skipped. If DEBUG is defined and the assertion fails,
	202	* then it calls panic*( which may or may not reset/halt U-Boot (see
	203	* CONFIG_PANIC_HANG), It is hoped that all failing assertions are found
	204	* before release, and after release it is hoped that they don't matter. But
	205	* in any case these failing assertions cannot be fixed with a reset (which
	206	* may just do the same assertion again).
	207	*/
	208	void __assert_fail(const char assertion, const char file, unsigned int line,
	209	const char *function);
b236f8c0 HS	210
	211	/**
	212	* assert() - assert expression is true
	213	*
	214	* If the expression x evaluates to false and _DEBUG evaluates to true, a panic
	215	* message is written and the system stalls. The value of _DEBUG is set to true
	216	* if DEBUG is defined before including common.h.
	217	*
	218	* The expression x is always executed irrespective of the value of _DEBUG.
	219	*
	220	* @x: expression to test
	221	*/
0e98b0a6 SG	222	#define assert(x) \
	223	({ if (!(x) && _DEBUG) \
	224	__assert_fail(#x, __FILE__, __LINE__, __func__); })
	225
cd01d2d5 SG	226	/*
	227	* This one actually gets compiled in even without DEBUG. It doesn't include the
	228	* full pathname as it may be huge. Only use this when the user should be
	229	* warning, similar to BUG_ON() in linux.
	230	*
	231	* @return true if assertion succeeded (condition is true), else false
	232	*/
	233	#define assert_noisy(x) \
	234	({ bool _val = (x); \
	235	if (!_val) \
	236	__assert_fail(#x, "?", __LINE__, __func__); \
	237	_val; \
	238	})
	239
4d8d3056 SG	240	#if CONFIG_IS_ENABLED(LOG) && defined(CONFIG_LOG_ERROR_RETURN)
	241	/*
	242	* Log an error return value, possibly with a message. Usage:
	243	*
	244	* return log_ret(fred_call());
	245	*
	246	* or:
	247	*
	248	* return log_msg_ret("fred failed", fred_call());
	249	*/
3707c6ee SG	250	#define log_ret(_ret) ({ \
	251	int __ret = (_ret); \
	252	if (__ret < 0) \
	253	log(LOG_CATEGORY, LOGL_ERR, "returning err=%d\n", __ret); \
	254	__ret; \
	255	})
b616cef9 SG	256	#define log_msg_ret(_msg, _ret) ({ \
	257	int __ret = (_ret); \
	258	if (__ret < 0) \
	259	log(LOG_CATEGORY, LOGL_ERR, "%s: returning err=%d\n", _msg, \
	260	__ret); \
	261	__ret; \
	262	})
3707c6ee	263	#else
4d8d3056	264	/* Non-logging versions of the above which just return the error code */
3707c6ee	265	#define log_ret(_ret) (_ret)
4d8d3056	266	#define log_msg_ret(_msg, _ret) ((void)(_msg), _ret)
3707c6ee SG	267	#endif
3707c6ee SG	268
e9c8d49d SG	269	/**
	270	* struct log_rec - a single log record
	271	*
	272	* Holds information about a single record in the log
	273	*
	274	* Members marked as 'not allocated' are stored as pointers and the caller is
	275	* responsible for making sure that the data pointed to is not overwritten.
	276	* Memebers marked as 'allocated' are allocated (e.g. via strdup()) by the log
	277	* system.
	278	*
	279	* @cat: Category, representing a uclass or part of U-Boot
	280	* @level: Severity level, less severe is higher
	281	* @file: Name of file where the log record was generated (not allocated)
	282	* @line: Line number where the log record was generated
	283	* @func: Function where the log record was generated (not allocated)
	284	* @msg: Log message (allocated)
	285	*/
	286	struct log_rec {
	287	enum log_category_t cat;
	288	enum log_level_t level;
	289	const char *file;
	290	int line;
	291	const char *func;
	292	const char *msg;
	293	};
	294
	295	struct log_device;
	296
	297	/**
	298	* struct log_driver - a driver which accepts and processes log records
	299	*
	300	* @name: Name of driver
	301	*/
	302	struct log_driver {
	303	const char *name;
	304	/**
	305	* emit() - emit a log record
	306	*
	307	* Called by the log system to pass a log record to a particular driver
	308	* for processing. The filter is checked before calling this function.
	309	*/
	310	int (emit)(struct log_device ldev, struct log_rec *rec);
	311	};
	312
	313	/**
	314	* struct log_device - an instance of a log driver
	315	*
	316	* Since drivers are set up at build-time we need to have a separate device for
	317	* the run-time aspects of drivers (currently just a list of filters to apply
	318	* to records send to this device).
	319	*
	320	* @next_filter_num: Seqence number of next filter filter added (0=no filters
	321	* yet). This increments with each new filter on the device, but never
	322	* decrements
	323	* @drv: Pointer to driver for this device
	324	* @filter_head: List of filters for this device
	325	* @sibling_node: Next device in the list of all devices
	326	*/
	327	struct log_device {
	328	int next_filter_num;
	329	struct log_driver *drv;
	330	struct list_head filter_head;
	331	struct list_head sibling_node;
	332	};
333
334	enum {
335	LOGF_MAX_CATEGORIES = 5, /* maximum categories per filter */
336	};
337
338	enum log_filter_flags {
339	LOGFF_HAS_CAT = 1 << 0, /* Filter has a category list */
340	};
341
342	/**
343	* struct log_filter - criterial to filter out log messages
344	*
345	* @filter_num: Sequence number of this filter. This is returned when adding a
346	* new filter, and must be provided when removing a previously added
347	* filter.
348	* @flags: Flags for this filter (LOGFF_...)
349	* @cat_list: List of categories to allow (terminated by LOGC_none). If empty
350	* then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
351	* can be provided
352	* @max_level: Maximum log level to allow
353	* @file_list: List of files to allow, separated by comma. If NULL then all
354	* files are permitted
355	* @sibling_node: Next filter in the list of filters for this log device
356	*/
357	struct log_filter {
358	int filter_num;
359	int flags;
360	enum log_category_t cat_list[LOGF_MAX_CATEGORIES];
361	enum log_level_t max_level;
362	const char *file_list;
363	struct list_head sibling_node;
364	};
365
366	#define LOG_DRIVER(_name) \
367	ll_entry_declare(struct log_driver, _name, log_driver)
368
f941c8d7 SG	369	/**
	370	* log_get_cat_name() - Get the name of a category
	371	*
	372	* @cat: Category to look up
c2e4e7e6 SG	373	* @return category name (which may be a uclass driver name) if found, or
c2e4e7e6 SG	374	* "<invalid>" if invalid, or "<missing>" if not found
f941c8d7 SG	375	*/
	376	const char *log_get_cat_name(enum log_category_t cat);
	377
	378	/**
	379	* log_get_cat_by_name() - Look up a category by name
	380	*
	381	* @name: Name to look up
	382	* @return category ID, or LOGC_NONE if not found
	383	*/
	384	enum log_category_t log_get_cat_by_name(const char *name);
	385
	386	/**
	387	* log_get_level_name() - Get the name of a log level
	388	*
	389	* @level: Log level to look up
	390	* @return log level name (in ALL CAPS)
	391	*/
	392	const char *log_get_level_name(enum log_level_t level);
	393
	394	/**
	395	* log_get_level_by_name() - Look up a log level by name
	396	*
	397	* @name: Name to look up
	398	* @return log level ID, or LOGL_NONE if not found
	399	*/
	400	enum log_level_t log_get_level_by_name(const char *name);
	401
3b73e8d0 SG	402	/* Log format flags (bit numbers) for gd->log_fmt. See log_fmt_chars */
	403	enum log_fmt {
	404	LOGF_CAT = 0,
	405	LOGF_LEVEL,
	406	LOGF_FILE,
	407	LOGF_LINE,
	408	LOGF_FUNC,
	409	LOGF_MSG,
	410
	411	LOGF_COUNT,
	412	LOGF_DEFAULT = (1 << LOGF_FUNC) \| (1 << LOGF_MSG),
	413	LOGF_ALL = 0x3f,
	414	};
	415
ef11ed82 SG	416	/* Handle the 'log test' command */
	417	int do_log_test(cmd_tbl_t cmdtp, int flag, int argc, char const argv[]);
	418
e9c8d49d SG	419	/**
	420	* log_add_filter() - Add a new filter to a log device
	421	*
	422	* @drv_name: Driver name to add the filter to (since each driver only has a
	423	* single device)
	424	* @cat_list: List of categories to allow (terminated by LOGC_none). If empty
	425	* then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
	426	* can be provided
	427	* @max_level: Maximum log level to allow
	428	* @file_list: List of files to allow, separated by comma. If NULL then all
	429	* files are permitted
	430	* @return the sequence number of the new filter (>=0) if the filter was added,
	431	* or a -ve value on error
	432	*/
	433	int log_add_filter(const char *drv_name, enum log_category_t cat_list[],
	434	enum log_level_t max_level, const char *file_list);
	435
	436	/**
	437	* log_remove_filter() - Remove a filter from a log device
	438	*
	439	* @drv_name: Driver name to remove the filter from (since each driver only has
	440	* a single device)
	441	* @filter_num: Filter number to remove (as returned by log_add_filter())
	442	* @return 0 if the filter was removed, -ENOENT if either the driver or the
	443	* filter number was not found
	444	*/
	445	int log_remove_filter(const char *drv_name, int filter_num);
	446
	447	#if CONFIG_IS_ENABLED(LOG)
	448	/**
	449	* log_init() - Set up the log system ready for use
	450	*
	451	* @return 0 if OK, -ENOMEM if out of memory
	452	*/
	453	int log_init(void);
	454	#else
	455	static inline int log_init(void)
	456	{
	457	return 0;
	458	}
	459	#endif
	460
0e98b0a6	461	#endif