1 /* SPDX-License-Identifier: GPL-2.0+ */
5 * Copyright (c) 2017 Google, Inc
6 * Written by Simon Glass <sjg@chromium.org>
12 #include <dm/uclass-id.h>
13 #include <linux/list.h>
15 /** Log levels supported, ranging from most to least important */
17 LOGL_EMERG = 0, /* U-Boot is unstable */
18 LOGL_ALERT, /* Action must be taken immediately */
19 LOGL_CRIT, /* Critical conditions */
20 LOGL_ERR, /* Error that prevents something from working */
21 LOGL_WARNING, /* Warning may prevent optimial operation */
22 LOGL_NOTICE, /* Normal but significant condition, printf() */
23 LOGL_INFO, /* General information message */
24 LOGL_DEBUG, /* Basic debug-level message */
25 LOGL_DEBUG_CONTENT, /* Debug message showing full message content */
26 LOGL_DEBUG_IO, /* Debug message showing hardware I/O access */
31 LOGL_FIRST = LOGL_EMERG,
32 LOGL_MAX = LOGL_DEBUG_IO,
36 * Log categories supported. Most of these correspond to uclasses (i.e.
37 * enum uclass_id) but there are also some more generic categories
40 LOGC_FIRST = 0, /* First part mirrors UCLASS_... */
42 LOGC_NONE = UCLASS_COUNT, /* First number is after all uclasses */
43 LOGC_ARCH, /* Related to arch-specific code */
44 LOGC_BOARD, /* Related to board-specific code */
45 LOGC_CORE, /* Related to core features (non-driver-model) */
46 LOGC_DM, /* Core driver-model */
47 LOGC_DT, /* Device-tree */
48 LOGC_EFI, /* EFI implementation */
49 LOGC_ALLOC, /* Memory allocation */
50 LOGC_SANDBOX, /* Related to the sandbox board */
51 LOGC_BLOBLIST, /* Bloblist */
52 LOGC_DEVRES, /* Device resources (devres_... functions) */
54 LOGC_COUNT, /* Number of log categories */
55 LOGC_END, /* Sentinel value for a list of log categories */
58 /* Helper to cast a uclass ID to a log category */
59 static inline int log_uc_cat(enum uclass_id id)
61 return (enum log_category_t)id;
65 * _log() - Internal function to emit a new log record
67 * @cat: Category of log record (indicating which subsystem generated it)
68 * @level: Level of log record (indicating its severity)
69 * @file: File name of file where log record was generated
70 * @line: Line number in file where log record was generated
71 * @func: Function where log record was generated
72 * @fmt: printf() format string for log record
73 * @...: Optional parameters, according to the format string @fmt
74 * @return 0 if log record was emitted, -ve on error
76 int _log(enum log_category_t cat, enum log_level_t level, const char *file,
77 int line, const char *func, const char *fmt, ...)
78 __attribute__ ((format (__printf__, 6, 7)));
80 static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
81 const char *file, int line, const char *func,
83 __attribute__ ((format (__printf__, 6, 7)));
85 static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
86 const char *file, int line, const char *func,
92 /* Define this at the top of a file to add a prefix to debug messages */
94 #define pr_fmt(fmt) fmt
97 /* Use a default category if this file does not supply one */
99 #define LOG_CATEGORY LOGC_NONE
103 * This header may be including when CONFIG_LOG is disabled, in which case
104 * CONFIG_LOG_MAX_LEVEL is not defined. Add a check for this.
106 #if CONFIG_IS_ENABLED(LOG)
107 #define _LOG_MAX_LEVEL CONFIG_VAL(LOG_MAX_LEVEL)
108 #define log_err(_fmt...) log(LOG_CATEGORY, LOGL_ERR, ##_fmt)
109 #define log_warning(_fmt...) log(LOG_CATEGORY, LOGL_WARNING, ##_fmt)
110 #define log_notice(_fmt...) log(LOG_CATEGORY, LOGL_NOTICE, ##_fmt)
111 #define log_info(_fmt...) log(LOG_CATEGORY, LOGL_INFO, ##_fmt)
112 #define log_debug(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG, ##_fmt)
113 #define log_content(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_CONTENT, ##_fmt)
114 #define log_io(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
116 #define _LOG_MAX_LEVEL LOGL_INFO
117 #define log_err(_fmt...) log_nop(LOG_CATEGORY, LOGL_ERR, ##_fmt)
118 #define log_warning(_fmt...) log_nop(LOG_CATEGORY, LOGL_WARNING, ##_fmt)
119 #define log_notice(_fmt...) log_nop(LOG_CATEGORY, LOGL_NOTICE, ##_fmt)
120 #define log_info(_fmt...) log_nop(LOG_CATEGORY, LOGL_INFO, ##_fmt)
121 #define log_debug(_fmt...) log_nop(LOG_CATEGORY, LOGL_DEBUG, ##_fmt)
122 #define log_content(_fmt...) log_nop(LOG_CATEGORY, \
123 LOGL_DEBUG_CONTENT, ##_fmt)
124 #define log_io(_fmt...) log_nop(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
127 #if CONFIG_IS_ENABLED(LOG)
134 /* Emit a log record if the level is less that the maximum */
135 #define log(_cat, _level, _fmt, _args...) ({ \
137 if (CONFIG_IS_ENABLED(LOG) && (_l <= _LOG_MAX_LEVEL || _LOG_DEBUG)) \
138 _log((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
140 pr_fmt(_fmt), ##_args); \
143 #define log(_cat, _level, _fmt, _args...)
146 #define log_nop(_cat, _level, _fmt, _args...) ({ \
148 _log_nop((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
149 __func__, pr_fmt(_fmt), ##_args); \
158 #ifdef CONFIG_SPL_BUILD
164 #if !_DEBUG && CONFIG_IS_ENABLED(LOG)
166 #define debug_cond(cond, fmt, args...) \
169 log(LOG_CATEGORY, LOGL_DEBUG, fmt, ##args); \
175 * Output a debug text when condition "cond" is met. The "cond" should be
176 * computed by a preprocessor in the best case, allowing for the best
179 #define debug_cond(cond, fmt, args...) \
182 printf(pr_fmt(fmt), ##args); \
187 /* Show a message if DEBUG is defined in a file */
188 #define debug(fmt, args...) \
189 debug_cond(_DEBUG, fmt, ##args)
191 /* Show a message if not in SPL */
192 #define warn_non_spl(fmt, args...) \
193 debug_cond(!_SPL_BUILD, fmt, ##args)
196 * An assertion is run-time check done in debug mode only. If DEBUG is not
197 * defined then it is skipped. If DEBUG is defined and the assertion fails,
198 * then it calls panic*( which may or may not reset/halt U-Boot (see
199 * CONFIG_PANIC_HANG), It is hoped that all failing assertions are found
200 * before release, and after release it is hoped that they don't matter. But
201 * in any case these failing assertions cannot be fixed with a reset (which
202 * may just do the same assertion again).
204 void __assert_fail(const char *assertion, const char *file, unsigned int line,
205 const char *function);
208 * assert() - assert expression is true
210 * If the expression x evaluates to false and _DEBUG evaluates to true, a panic
211 * message is written and the system stalls. The value of _DEBUG is set to true
212 * if DEBUG is defined before including common.h.
214 * The expression x is always executed irrespective of the value of _DEBUG.
216 * @x: expression to test
219 ({ if (!(x) && _DEBUG) \
220 __assert_fail(#x, __FILE__, __LINE__, __func__); })
223 * This one actually gets compiled in even without DEBUG. It doesn't include the
224 * full pathname as it may be huge. Only use this when the user should be
225 * warning, similar to BUG_ON() in linux.
227 * @return true if assertion succeeded (condition is true), else false
229 #define assert_noisy(x) \
230 ({ bool _val = (x); \
232 __assert_fail(#x, "?", __LINE__, __func__); \
236 #if CONFIG_IS_ENABLED(LOG) && defined(CONFIG_LOG_ERROR_RETURN)
238 * Log an error return value, possibly with a message. Usage:
240 * return log_ret(fred_call());
244 * return log_msg_ret("fred failed", fred_call());
246 #define log_ret(_ret) ({ \
247 int __ret = (_ret); \
249 log(LOG_CATEGORY, LOGL_ERR, "returning err=%d\n", __ret); \
252 #define log_msg_ret(_msg, _ret) ({ \
253 int __ret = (_ret); \
255 log(LOG_CATEGORY, LOGL_ERR, "%s: returning err=%d\n", _msg, \
260 /* Non-logging versions of the above which just return the error code */
261 #define log_ret(_ret) (_ret)
262 #define log_msg_ret(_msg, _ret) ((void)(_msg), _ret)
266 * struct log_rec - a single log record
268 * Holds information about a single record in the log
270 * Members marked as 'not allocated' are stored as pointers and the caller is
271 * responsible for making sure that the data pointed to is not overwritten.
272 * Memebers marked as 'allocated' are allocated (e.g. via strdup()) by the log
275 * @cat: Category, representing a uclass or part of U-Boot
276 * @level: Severity level, less severe is higher
277 * @file: Name of file where the log record was generated (not allocated)
278 * @line: Line number where the log record was generated
279 * @func: Function where the log record was generated (not allocated)
280 * @msg: Log message (allocated)
283 enum log_category_t cat;
284 enum log_level_t level;
294 * struct log_driver - a driver which accepts and processes log records
296 * @name: Name of driver
301 * emit() - emit a log record
303 * Called by the log system to pass a log record to a particular driver
304 * for processing. The filter is checked before calling this function.
306 int (*emit)(struct log_device *ldev, struct log_rec *rec);
310 * struct log_device - an instance of a log driver
312 * Since drivers are set up at build-time we need to have a separate device for
313 * the run-time aspects of drivers (currently just a list of filters to apply
314 * to records send to this device).
316 * @next_filter_num: Seqence number of next filter filter added (0=no filters
317 * yet). This increments with each new filter on the device, but never
319 * @drv: Pointer to driver for this device
320 * @filter_head: List of filters for this device
321 * @sibling_node: Next device in the list of all devices
325 struct log_driver *drv;
326 struct list_head filter_head;
327 struct list_head sibling_node;
331 LOGF_MAX_CATEGORIES = 5, /* maximum categories per filter */
334 enum log_filter_flags {
335 LOGFF_HAS_CAT = 1 << 0, /* Filter has a category list */
339 * struct log_filter - criterial to filter out log messages
341 * @filter_num: Sequence number of this filter. This is returned when adding a
342 * new filter, and must be provided when removing a previously added
344 * @flags: Flags for this filter (LOGFF_...)
345 * @cat_list: List of categories to allow (terminated by LOGC_none). If empty
346 * then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
348 * @max_level: Maximum log level to allow
349 * @file_list: List of files to allow, separated by comma. If NULL then all
350 * files are permitted
351 * @sibling_node: Next filter in the list of filters for this log device
356 enum log_category_t cat_list[LOGF_MAX_CATEGORIES];
357 enum log_level_t max_level;
358 const char *file_list;
359 struct list_head sibling_node;
362 #define LOG_DRIVER(_name) \
363 ll_entry_declare(struct log_driver, _name, log_driver)
366 * log_get_cat_name() - Get the name of a category
368 * @cat: Category to look up
369 * @return category name (which may be a uclass driver name) if found, or
370 * "<invalid>" if invalid, or "<missing>" if not found
372 const char *log_get_cat_name(enum log_category_t cat);
375 * log_get_cat_by_name() - Look up a category by name
377 * @name: Name to look up
378 * @return category ID, or LOGC_NONE if not found
380 enum log_category_t log_get_cat_by_name(const char *name);
383 * log_get_level_name() - Get the name of a log level
385 * @level: Log level to look up
386 * @return log level name (in ALL CAPS)
388 const char *log_get_level_name(enum log_level_t level);
391 * log_get_level_by_name() - Look up a log level by name
393 * @name: Name to look up
394 * @return log level ID, or LOGL_NONE if not found
396 enum log_level_t log_get_level_by_name(const char *name);
398 /* Log format flags (bit numbers) for gd->log_fmt. See log_fmt_chars */
408 LOGF_DEFAULT = (1 << LOGF_FUNC) | (1 << LOGF_MSG),
412 /* Handle the 'log test' command */
413 int do_log_test(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]);
416 * log_add_filter() - Add a new filter to a log device
418 * @drv_name: Driver name to add the filter to (since each driver only has a
420 * @cat_list: List of categories to allow (terminated by LOGC_none). If empty
421 * then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
423 * @max_level: Maximum log level to allow
424 * @file_list: List of files to allow, separated by comma. If NULL then all
425 * files are permitted
426 * @return the sequence number of the new filter (>=0) if the filter was added,
427 * or a -ve value on error
429 int log_add_filter(const char *drv_name, enum log_category_t cat_list[],
430 enum log_level_t max_level, const char *file_list);
433 * log_remove_filter() - Remove a filter from a log device
435 * @drv_name: Driver name to remove the filter from (since each driver only has
437 * @filter_num: Filter number to remove (as returned by log_add_filter())
438 * @return 0 if the filter was removed, -ENOENT if either the driver or the
439 * filter number was not found
441 int log_remove_filter(const char *drv_name, int filter_num);
443 #if CONFIG_IS_ENABLED(LOG)
445 * log_init() - Set up the log system ready for use
447 * @return 0 if OK, -ENOMEM if out of memory
451 static inline int log_init(void)