log.h 13 KB

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