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Tom Rini83d290c2018-05-06 17:58:06 -04001/* SPDX-License-Identifier: GPL-2.0+ */
Simon Glass0e98b0a2017-12-04 13:48:20 -07002/*
3 * Logging support
4 *
5 * Copyright (c) 2017 Google, Inc
6 * Written by Simon Glass <sjg@chromium.org>
Simon Glass0e98b0a2017-12-04 13:48:20 -07007 */
8
9#ifndef __LOG_H
10#define __LOG_H
11
Simon Glasse9c8d492017-12-04 13:48:24 -070012#include <dm/uclass-id.h>
13#include <linux/list.h>
14
15/** Log levels supported, ranging from most to least important */
16enum log_level_t {
Simon Glass6fc7e932019-02-16 20:24:34 -070017 LOGL_EMERG = 0, /* U-Boot is unstable */
Simon Glasse9c8d492017-12-04 13:48:24 -070018 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 */
27
28 LOGL_COUNT,
Simon Glassf941c8d2017-12-28 13:14:16 -070029 LOGL_NONE,
30
Simon Glasse9c8d492017-12-04 13:48:24 -070031 LOGL_FIRST = LOGL_EMERG,
Simon Glassf941c8d2017-12-28 13:14:16 -070032 LOGL_MAX = LOGL_DEBUG_IO,
Simon Glasse9c8d492017-12-04 13:48:24 -070033};
34
35/**
36 * Log categories supported. Most of these correspond to uclasses (i.e.
37 * enum uclass_id) but there are also some more generic categories
38 */
39enum log_category_t {
40 LOGC_FIRST = 0, /* First part mirrors UCLASS_... */
41
Simon Glass0bf96452018-10-01 12:22:32 -060042 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) */
Simon Glassf941c8d2017-12-28 13:14:16 -070046 LOGC_DM, /* Core driver-model */
47 LOGC_DT, /* Device-tree */
Heinrich Schuchardtd8d89972018-03-23 21:12:17 +010048 LOGC_EFI, /* EFI implementation */
Simon Glassc3aed5d2018-10-01 11:55:13 -060049 LOGC_ALLOC, /* Memory allocation */
Simon Glassa5c13b62018-11-06 15:21:24 -070050 LOGC_SANDBOX, /* Related to the sandbox board */
Simon Glass9f407d42018-11-15 18:43:50 -070051 LOGC_BLOBLIST, /* Bloblist */
Simon Glasse9c8d492017-12-04 13:48:24 -070052
Simon Glass0bf96452018-10-01 12:22:32 -060053 LOGC_COUNT, /* Number of log categories */
54 LOGC_END, /* Sentinel value for a list of log categories */
Simon Glasse9c8d492017-12-04 13:48:24 -070055};
56
57/* Helper to cast a uclass ID to a log category */
58static inline int log_uc_cat(enum uclass_id id)
59{
60 return (enum log_category_t)id;
61}
62
63/**
64 * _log() - Internal function to emit a new log record
65 *
66 * @cat: Category of log record (indicating which subsystem generated it)
67 * @level: Level of log record (indicating its severity)
68 * @file: File name of file where log record was generated
69 * @line: Line number in file where log record was generated
70 * @func: Function where log record was generated
71 * @fmt: printf() format string for log record
72 * @...: Optional parameters, according to the format string @fmt
73 * @return 0 if log record was emitted, -ve on error
74 */
75int _log(enum log_category_t cat, enum log_level_t level, const char *file,
Simon Glassed4e9332019-01-07 16:44:19 -070076 int line, const char *func, const char *fmt, ...)
77 __attribute__ ((format (__printf__, 6, 7)));
Simon Glasse9c8d492017-12-04 13:48:24 -070078
79/* Define this at the top of a file to add a prefix to debug messages */
80#ifndef pr_fmt
81#define pr_fmt(fmt) fmt
82#endif
83
84/* Use a default category if this file does not supply one */
85#ifndef LOG_CATEGORY
86#define LOG_CATEGORY LOGC_NONE
87#endif
88
89/*
90 * This header may be including when CONFIG_LOG is disabled, in which case
91 * CONFIG_LOG_MAX_LEVEL is not defined. Add a check for this.
92 */
93#if CONFIG_IS_ENABLED(LOG)
94#define _LOG_MAX_LEVEL CONFIG_VAL(LOG_MAX_LEVEL)
Simon Glasscdd140a2018-10-01 11:55:06 -060095#define log_err(_fmt...) log(LOG_CATEGORY, LOGL_ERR, ##_fmt)
96#define log_warning(_fmt...) log(LOG_CATEGORY, LOGL_WARNING, ##_fmt)
97#define log_notice(_fmt...) log(LOG_CATEGORY, LOGL_NOTICE, ##_fmt)
98#define log_info(_fmt...) log(LOG_CATEGORY, LOGL_INFO, ##_fmt)
99#define log_debug(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG, ##_fmt)
100#define log_content(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_CONTENT, ##_fmt)
101#define log_io(_fmt...) log(LOG_CATEGORY, LOGL_DEBUG_IO, ##_fmt)
Simon Glasse9c8d492017-12-04 13:48:24 -0700102#else
103#define _LOG_MAX_LEVEL LOGL_INFO
Simon Glasscdd140a2018-10-01 11:55:06 -0600104#define log_err(_fmt...)
105#define log_warning(_fmt...)
106#define log_notice(_fmt...)
107#define log_info(_fmt...)
108#define log_debug(_fmt...)
109#define log_content(_fmt...)
110#define log_io(_fmt...)
Simon Glasse9c8d492017-12-04 13:48:24 -0700111#endif
112
Simon Glass4d8d3052018-11-15 18:43:49 -0700113#if CONFIG_IS_ENABLED(LOG)
Simon Glassf9811e82019-02-16 20:24:37 -0700114#ifdef LOG_DEBUG
115#define _LOG_DEBUG 1
116#else
117#define _LOG_DEBUG 0
118#endif
Simon Glass4d8d3052018-11-15 18:43:49 -0700119
Simon Glasse9c8d492017-12-04 13:48:24 -0700120/* Emit a log record if the level is less that the maximum */
121#define log(_cat, _level, _fmt, _args...) ({ \
122 int _l = _level; \
Simon Glassf9811e82019-02-16 20:24:37 -0700123 if (CONFIG_IS_ENABLED(LOG) && (_l <= _LOG_MAX_LEVEL || _LOG_DEBUG)) \
Simon Glasse9c8d492017-12-04 13:48:24 -0700124 _log((enum log_category_t)(_cat), _l, __FILE__, __LINE__, \
125 __func__, \
126 pr_fmt(_fmt), ##_args); \
127 })
Simon Glass4d8d3052018-11-15 18:43:49 -0700128#else
129#define log(_cat, _level, _fmt, _args...)
130#endif
Simon Glasse9c8d492017-12-04 13:48:24 -0700131
Simon Glass0e98b0a2017-12-04 13:48:20 -0700132#ifdef DEBUG
133#define _DEBUG 1
134#else
135#define _DEBUG 0
136#endif
137
138#ifdef CONFIG_SPL_BUILD
139#define _SPL_BUILD 1
140#else
141#define _SPL_BUILD 0
142#endif
143
Simon Glasse9c8d492017-12-04 13:48:24 -0700144#if !_DEBUG && CONFIG_IS_ENABLED(LOG)
145
146#define debug_cond(cond, fmt, args...) \
147 do { \
148 if (1) \
149 log(LOG_CATEGORY, LOGL_DEBUG, fmt, ##args); \
150 } while (0)
151
152#else /* _DEBUG */
153
Simon Glass0e98b0a2017-12-04 13:48:20 -0700154/*
155 * Output a debug text when condition "cond" is met. The "cond" should be
156 * computed by a preprocessor in the best case, allowing for the best
157 * optimization.
158 */
159#define debug_cond(cond, fmt, args...) \
160 do { \
161 if (cond) \
162 printf(pr_fmt(fmt), ##args); \
163 } while (0)
164
Simon Glasse9c8d492017-12-04 13:48:24 -0700165#endif /* _DEBUG */
166
Simon Glass0e98b0a2017-12-04 13:48:20 -0700167/* Show a message if DEBUG is defined in a file */
168#define debug(fmt, args...) \
169 debug_cond(_DEBUG, fmt, ##args)
170
171/* Show a message if not in SPL */
172#define warn_non_spl(fmt, args...) \
173 debug_cond(!_SPL_BUILD, fmt, ##args)
174
175/*
176 * An assertion is run-time check done in debug mode only. If DEBUG is not
177 * defined then it is skipped. If DEBUG is defined and the assertion fails,
178 * then it calls panic*( which may or may not reset/halt U-Boot (see
179 * CONFIG_PANIC_HANG), It is hoped that all failing assertions are found
180 * before release, and after release it is hoped that they don't matter. But
181 * in any case these failing assertions cannot be fixed with a reset (which
182 * may just do the same assertion again).
183 */
184void __assert_fail(const char *assertion, const char *file, unsigned int line,
185 const char *function);
Heinrich Schuchardtb236f8c2019-07-27 20:21:06 +0200186
187/**
188 * assert() - assert expression is true
189 *
190 * If the expression x evaluates to false and _DEBUG evaluates to true, a panic
191 * message is written and the system stalls. The value of _DEBUG is set to true
192 * if DEBUG is defined before including common.h.
193 *
194 * The expression x is always executed irrespective of the value of _DEBUG.
195 *
196 * @x: expression to test
197 */
Simon Glass0e98b0a2017-12-04 13:48:20 -0700198#define assert(x) \
199 ({ if (!(x) && _DEBUG) \
200 __assert_fail(#x, __FILE__, __LINE__, __func__); })
201
Simon Glass4d8d3052018-11-15 18:43:49 -0700202#if CONFIG_IS_ENABLED(LOG) && defined(CONFIG_LOG_ERROR_RETURN)
203/*
204 * Log an error return value, possibly with a message. Usage:
205 *
206 * return log_ret(fred_call());
207 *
208 * or:
209 *
210 * return log_msg_ret("fred failed", fred_call());
211 */
Simon Glass3707c6e2017-12-28 13:14:23 -0700212#define log_ret(_ret) ({ \
213 int __ret = (_ret); \
214 if (__ret < 0) \
215 log(LOG_CATEGORY, LOGL_ERR, "returning err=%d\n", __ret); \
216 __ret; \
217 })
Simon Glassb616cef2018-06-11 13:07:14 -0600218#define log_msg_ret(_msg, _ret) ({ \
219 int __ret = (_ret); \
220 if (__ret < 0) \
221 log(LOG_CATEGORY, LOGL_ERR, "%s: returning err=%d\n", _msg, \
222 __ret); \
223 __ret; \
224 })
Simon Glass3707c6e2017-12-28 13:14:23 -0700225#else
Simon Glass4d8d3052018-11-15 18:43:49 -0700226/* Non-logging versions of the above which just return the error code */
Simon Glass3707c6e2017-12-28 13:14:23 -0700227#define log_ret(_ret) (_ret)
Simon Glass4d8d3052018-11-15 18:43:49 -0700228#define log_msg_ret(_msg, _ret) ((void)(_msg), _ret)
Simon Glass3707c6e2017-12-28 13:14:23 -0700229#endif
230
Simon Glasse9c8d492017-12-04 13:48:24 -0700231/**
232 * struct log_rec - a single log record
233 *
234 * Holds information about a single record in the log
235 *
236 * Members marked as 'not allocated' are stored as pointers and the caller is
237 * responsible for making sure that the data pointed to is not overwritten.
238 * Memebers marked as 'allocated' are allocated (e.g. via strdup()) by the log
239 * system.
240 *
241 * @cat: Category, representing a uclass or part of U-Boot
242 * @level: Severity level, less severe is higher
243 * @file: Name of file where the log record was generated (not allocated)
244 * @line: Line number where the log record was generated
245 * @func: Function where the log record was generated (not allocated)
246 * @msg: Log message (allocated)
247 */
248struct log_rec {
249 enum log_category_t cat;
250 enum log_level_t level;
251 const char *file;
252 int line;
253 const char *func;
254 const char *msg;
255};
256
257struct log_device;
258
259/**
260 * struct log_driver - a driver which accepts and processes log records
261 *
262 * @name: Name of driver
263 */
264struct log_driver {
265 const char *name;
266 /**
267 * emit() - emit a log record
268 *
269 * Called by the log system to pass a log record to a particular driver
270 * for processing. The filter is checked before calling this function.
271 */
272 int (*emit)(struct log_device *ldev, struct log_rec *rec);
273};
274
275/**
276 * struct log_device - an instance of a log driver
277 *
278 * Since drivers are set up at build-time we need to have a separate device for
279 * the run-time aspects of drivers (currently just a list of filters to apply
280 * to records send to this device).
281 *
282 * @next_filter_num: Seqence number of next filter filter added (0=no filters
283 * yet). This increments with each new filter on the device, but never
284 * decrements
285 * @drv: Pointer to driver for this device
286 * @filter_head: List of filters for this device
287 * @sibling_node: Next device in the list of all devices
288 */
289struct log_device {
290 int next_filter_num;
291 struct log_driver *drv;
292 struct list_head filter_head;
293 struct list_head sibling_node;
294};
295
296enum {
297 LOGF_MAX_CATEGORIES = 5, /* maximum categories per filter */
298};
299
300enum log_filter_flags {
301 LOGFF_HAS_CAT = 1 << 0, /* Filter has a category list */
302};
303
304/**
305 * struct log_filter - criterial to filter out log messages
306 *
307 * @filter_num: Sequence number of this filter. This is returned when adding a
308 * new filter, and must be provided when removing a previously added
309 * filter.
310 * @flags: Flags for this filter (LOGFF_...)
311 * @cat_list: List of categories to allow (terminated by LOGC_none). If empty
312 * then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
313 * can be provided
314 * @max_level: Maximum log level to allow
315 * @file_list: List of files to allow, separated by comma. If NULL then all
316 * files are permitted
317 * @sibling_node: Next filter in the list of filters for this log device
318 */
319struct log_filter {
320 int filter_num;
321 int flags;
322 enum log_category_t cat_list[LOGF_MAX_CATEGORIES];
323 enum log_level_t max_level;
324 const char *file_list;
325 struct list_head sibling_node;
326};
327
328#define LOG_DRIVER(_name) \
329 ll_entry_declare(struct log_driver, _name, log_driver)
330
Simon Glassf941c8d2017-12-28 13:14:16 -0700331/**
332 * log_get_cat_name() - Get the name of a category
333 *
334 * @cat: Category to look up
Simon Glassc2e4e7e2018-06-12 00:04:55 -0600335 * @return category name (which may be a uclass driver name) if found, or
336 * "<invalid>" if invalid, or "<missing>" if not found
Simon Glassf941c8d2017-12-28 13:14:16 -0700337 */
338const char *log_get_cat_name(enum log_category_t cat);
339
340/**
341 * log_get_cat_by_name() - Look up a category by name
342 *
343 * @name: Name to look up
344 * @return category ID, or LOGC_NONE if not found
345 */
346enum log_category_t log_get_cat_by_name(const char *name);
347
348/**
349 * log_get_level_name() - Get the name of a log level
350 *
351 * @level: Log level to look up
352 * @return log level name (in ALL CAPS)
353 */
354const char *log_get_level_name(enum log_level_t level);
355
356/**
357 * log_get_level_by_name() - Look up a log level by name
358 *
359 * @name: Name to look up
360 * @return log level ID, or LOGL_NONE if not found
361 */
362enum log_level_t log_get_level_by_name(const char *name);
363
Simon Glass3b73e8d2017-12-28 13:14:17 -0700364/* Log format flags (bit numbers) for gd->log_fmt. See log_fmt_chars */
365enum log_fmt {
366 LOGF_CAT = 0,
367 LOGF_LEVEL,
368 LOGF_FILE,
369 LOGF_LINE,
370 LOGF_FUNC,
371 LOGF_MSG,
372
373 LOGF_COUNT,
374 LOGF_DEFAULT = (1 << LOGF_FUNC) | (1 << LOGF_MSG),
375 LOGF_ALL = 0x3f,
376};
377
Simon Glassef11ed82017-12-04 13:48:27 -0700378/* Handle the 'log test' command */
379int do_log_test(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]);
380
Simon Glasse9c8d492017-12-04 13:48:24 -0700381/**
382 * log_add_filter() - Add a new filter to a log device
383 *
384 * @drv_name: Driver name to add the filter to (since each driver only has a
385 * single device)
386 * @cat_list: List of categories to allow (terminated by LOGC_none). If empty
387 * then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
388 * can be provided
389 * @max_level: Maximum log level to allow
390 * @file_list: List of files to allow, separated by comma. If NULL then all
391 * files are permitted
392 * @return the sequence number of the new filter (>=0) if the filter was added,
393 * or a -ve value on error
394 */
395int log_add_filter(const char *drv_name, enum log_category_t cat_list[],
396 enum log_level_t max_level, const char *file_list);
397
398/**
399 * log_remove_filter() - Remove a filter from a log device
400 *
401 * @drv_name: Driver name to remove the filter from (since each driver only has
402 * a single device)
403 * @filter_num: Filter number to remove (as returned by log_add_filter())
404 * @return 0 if the filter was removed, -ENOENT if either the driver or the
405 * filter number was not found
406 */
407int log_remove_filter(const char *drv_name, int filter_num);
408
409#if CONFIG_IS_ENABLED(LOG)
410/**
411 * log_init() - Set up the log system ready for use
412 *
413 * @return 0 if OK, -ENOMEM if out of memory
414 */
415int log_init(void);
416#else
417static inline int log_init(void)
418{
419 return 0;
420}
421#endif
422
Simon Glass0e98b0a2017-12-04 13:48:20 -0700423#endif