From 36ce99c1dcab2978fc1900f19b431adedd8f99f6 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 27 Aug 2009 16:45:07 +0200 Subject: [PATCH] ALSA: Add debug module option Add debug module option to snd core. This controls the debug print level. When CONFIG_SND_DEBUG_VERBOSE is set, you can suppress the debug messages by giving or changing this parameter to a lower value. debug=0 means no debug messsages. As default, it's set to the verbose level 2. Since this option can be changed dynamically via sysfs file, you can suppress the verbose debug messages on the fly, which wasn't possible before. Signed-off-by: Takashi Iwai --- .../sound/alsa/ALSA-Configuration.txt | 6 ++ include/sound/core.h | 38 ++++------- sound/core/misc.c | 67 +++++++++++-------- 3 files changed, 59 insertions(+), 52 deletions(-) diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt index 4252697a95d6..8e5b3488b370 100644 --- a/Documentation/sound/alsa/ALSA-Configuration.txt +++ b/Documentation/sound/alsa/ALSA-Configuration.txt @@ -60,6 +60,12 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed. slots - Reserve the slot index for the given driver. This option takes multiple strings. See "Module Autoloading Support" section for details. + debug - Specifies the debug message level + (0 = disable debug prints, 1 = normal debug messages, + 2 = verbose debug messages) + This option appears only when CONFIG_SND_DEBUG=y. + This option can be dynamically changed via sysfs + /sys/modules/snd/parameters/debug file. Module snd-pcm-oss ------------------ diff --git a/include/sound/core.h b/include/sound/core.h index 309cb9659a05..a89728db5584 100644 --- a/include/sound/core.h +++ b/include/sound/core.h @@ -340,18 +340,17 @@ unsigned int snd_dma_pointer(unsigned long dma, unsigned int size); struct resource; void release_and_free_resource(struct resource *res); -#ifdef CONFIG_SND_VERBOSE_PRINTK -void snd_verbose_printk(const char *file, int line, const char *format, ...) - __attribute__ ((format (printf, 3, 4))); -#endif -#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK) -void snd_verbose_printd(const char *file, int line, const char *format, ...) - __attribute__ ((format (printf, 3, 4))); -#endif - /* --- */ -#ifdef CONFIG_SND_VERBOSE_PRINTK +#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK) +void __snd_printk(unsigned int level, const char *file, int line, + const char *format, ...) + __attribute__ ((format (printf, 4, 5))); +#else +#define __snd_printk(level, file, line, format, args...) \ + prinkt(format, ##args) +#endif + /** * snd_printk - printk wrapper * @fmt: format string @@ -360,15 +359,9 @@ void snd_verbose_printd(const char *file, int line, const char *format, ...) * when configured with CONFIG_SND_VERBOSE_PRINTK. */ #define snd_printk(fmt, args...) \ - snd_verbose_printk(__FILE__, __LINE__, fmt ,##args) -#else -#define snd_printk(fmt, args...) \ - printk(fmt ,##args) -#endif + __snd_printk(0, __FILE__, __LINE__, fmt, ##args) #ifdef CONFIG_SND_DEBUG - -#ifdef CONFIG_SND_VERBOSE_PRINTK /** * snd_printd - debug printk * @fmt: format string @@ -377,11 +370,7 @@ void snd_verbose_printd(const char *file, int line, const char *format, ...) * Ignored when CONFIG_SND_DEBUG is not set. */ #define snd_printd(fmt, args...) \ - snd_verbose_printd(__FILE__, __LINE__, fmt ,##args) -#else -#define snd_printd(fmt, args...) \ - printk(fmt ,##args) -#endif + __snd_printk(1, __FILE__, __LINE__, fmt, ##args) /** * snd_BUG - give a BUG warning message and stack trace @@ -428,9 +417,10 @@ static inline int __snd_bug_on(int cond) * Works like snd_printk() for debugging purposes. * Ignored when CONFIG_SND_DEBUG_VERBOSE is not set. */ -#define snd_printdd(format, args...) snd_printk(format, ##args) +#define snd_printdd(format, args...) \ + __snd_printk(2, __FILE__, __LINE__, format, ##args) #else -#define snd_printdd(format, args...) /* nothing */ +#define snd_printdd(format, args...) do { } while (0) #endif diff --git a/sound/core/misc.c b/sound/core/misc.c index 1d29e678369e..23a032c6d487 100644 --- a/sound/core/misc.c +++ b/sound/core/misc.c @@ -24,6 +24,20 @@ #include #include +#ifdef CONFIG_SND_DEBUG + +#ifdef CONFIG_SND_DEBUG_VERBOSE +#define DEFAULT_DEBUG_LEVEL 2 +#else +#define DEFAULT_DEBUG_LEVEL 1 +#endif + +static int debug = DEFAULT_DEBUG_LEVEL; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Debug level (0 = disable)"); + +#endif /* CONFIG_SND_DEBUG */ + void release_and_free_resource(struct resource *res) { if (res) { @@ -35,6 +49,7 @@ void release_and_free_resource(struct resource *res) EXPORT_SYMBOL(release_and_free_resource); #ifdef CONFIG_SND_VERBOSE_PRINTK +/* strip the leading path if the given path is absolute */ static const char *sanity_file_name(const char *path) { if (*path == '/') @@ -43,48 +58,44 @@ static const char *sanity_file_name(const char *path) return path; } -void snd_verbose_printk(const char *path, int line, const char *format, ...) +/* print file and line with a certain printk prefix */ +static int print_snd_pfx(unsigned int level, const char *path, int line, + const char *format) { const char *file = sanity_file_name(path); - va_list args; - - if (format[0] == '<' && format[1] >= '0' && format[1] <= '7' && format[2] == '>') { - char tmp[] = "<0>"; + char tmp[] = "<0>"; + const char *pfx = level ? KERN_DEBUG : KERN_DEFAULT; + int ret = 0; + + if (format[0] == '<' && format[2] == '>') { tmp[1] = format[1]; - printk("%sALSA %s:%d: ", tmp, file, line); - format += 3; - } else { - printk("ALSA %s:%d: ", file, line); + pfx = tmp; + ret = 1; } - va_start(args, format); - vprintk(format, args); - va_end(args); + printk("%sALSA %s:%d: ", pfx, file, line); + return ret; } - -EXPORT_SYMBOL(snd_verbose_printk); +#else +#define print_snd_pfx(level, path, line, format) 0 #endif -#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK) -void snd_verbose_printd(const char *path, int line, const char *format, ...) +#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK) +void __snd_printk(unsigned int level, const char *path, int line, + const char *format, ...) { - const char *file = sanity_file_name(path); va_list args; - if (format[0] == '<' && format[1] >= '0' && format[1] <= '7' && format[2] == '>') { - char tmp[] = "<0>"; - tmp[1] = format[1]; - printk("%sALSA %s:%d: ", tmp, file, line); - format += 3; - } else { - printk(KERN_DEBUG "ALSA %s:%d: ", file, line); - } +#ifdef CONFIG_SND_DEBUG + if (debug < level) + return; +#endif va_start(args, format); + if (print_snd_pfx(level, path, line, format)) + format += 3; /* skip the printk level-prefix */ vprintk(format, args); va_end(args); - } - -EXPORT_SYMBOL(snd_verbose_printd); +EXPORT_SYMBOL_GPL(__snd_printk); #endif #ifdef CONFIG_PCI -- 2.39.2