At present if CONFIG_LOG enabled, putting LOG_DEBUG at the top of a file (before log.h inclusion) causes _log() to be executed for every log() call, regardless of the build- or run-time logging level.
However there is no guarantee that the log record will actually be displayed. If the current log level is lower than LOGL_DEBUG then it will not be.
Add a way to signal that the log record should always be displayed and update log_passes_filters() to handle this.
Signed-off-by: Simon Glass sjg@chromium.org ---
common/log.c | 6 +++++- doc/README.log | 7 ++----- include/log.h | 16 ++++++++++++---- 3 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/common/log.c b/common/log.c index c5b9b489ca..db7bb7d145 100644 --- a/common/log.c +++ b/common/log.c @@ -153,6 +153,9 @@ static bool log_passes_filters(struct log_device *ldev, struct log_rec *rec) { struct log_filter *filt;
+ if (rec->force_debug) + return true; + /* If there are no filters, filter on the default log level */ if (list_empty(&ldev->filter_head)) { if (rec->level > gd->default_log_level) @@ -204,7 +207,8 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file, va_list args;
rec.cat = cat; - rec.level = level; + rec.level = level & LOGL_LEVEL_MASK; + rec.force_debug = level & LOGL_FORCE_DEBUG; rec.file = file; rec.line = line; rec.func = func; diff --git a/doc/README.log b/doc/README.log index 1057981f45..0df0336fb3 100644 --- a/doc/README.log +++ b/doc/README.log @@ -77,11 +77,8 @@ Sometimes it is useful to turn on logging just in one file. You can use this: #define LOG_DEBUG
to enable building in of all logging statements in a single file. Put it at -the top of the file, before any #includes. - -To actually get U-Boot to output this you need to also set the default logging -level - e.g. set CONFIG_LOG_DEFAULT_LEVEL to 7 (LOGL_DEBUG) or more. Otherwise -debug output is suppressed and will not be generated. +the top of the file, before any #includes. This overrides any log-level setting +in U-Boot, including CONFIG_LOG_DEFAULT_LEVEL, but just for that file.
Convenience functions diff --git a/include/log.h b/include/log.h index cf32351134..2e6e06cae6 100644 --- a/include/log.h +++ b/include/log.h @@ -29,6 +29,9 @@ enum log_level_t { LOGL_COUNT, LOGL_NONE,
+ LOGL_LEVEL_MASK = 0xf, /* Mask for valid log levels */ + LOGL_FORCE_DEBUG = 0x10, /* Mask to force output due to LOG_DEBUG */ + LOGL_FIRST = LOGL_EMERG, LOGL_MAX = LOGL_DEBUG_IO, }; @@ -129,7 +132,7 @@ static inline int _log_nop(enum log_category_t cat, enum log_level_t level,
#if CONFIG_IS_ENABLED(LOG) #ifdef LOG_DEBUG -#define _LOG_DEBUG 1 +#define _LOG_DEBUG LOGL_FORCE_DEBUG #else #define _LOG_DEBUG 0 #endif @@ -137,9 +140,9 @@ static inline int _log_nop(enum log_category_t cat, enum log_level_t level, /* 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__, \ + if (CONFIG_IS_ENABLED(LOG) && (_LOG_DEBUG || _l <= _LOG_MAX_LEVEL)) \ + _log((enum log_category_t)(_cat), _l | _LOG_DEBUG, __FILE__, \ + __LINE__, __func__, \ pr_fmt(_fmt), ##_args); \ }) #else @@ -275,8 +278,12 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line, * Memebers marked as 'allocated' are allocated (e.g. via strdup()) by the log * system. * + * TODO(sjg@chromium.org): Compress this struct down a bit to reduce space, e.g. + * a single u32 for cat, level, line and force_debug + * * @cat: Category, representing a uclass or part of U-Boot * @level: Severity level, less severe is higher + * @force_debug: Force output of debug * @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) @@ -285,6 +292,7 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line, struct log_rec { enum log_category_t cat; enum log_level_t level; + bool force_debug; const char *file; int line; const char *func;