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PM: sleep: enable dynamic debug support within pm_pr_dbg() 

Currently pm_pr_dbg() is used to filter kernel pm debug messages based
on pm_debug_messages_on flag. The problem is if we enable/disable this
flag it will affect all pm_pr_dbg() calls at once, so we can't
individually control them.

This patch changes pm_pr_dbg() implementation as such:

 - If pm_debug_messages_on is enabled, print the message.
 - If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is
   enabled, only print the messages explicitly enabled on
   /sys/kernel/debug/dynamic_debug/control.
 - If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is
   disabled, don't print the message.

Signed-off-by: David Cohen <dacohen@pm.me>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
David Cohen 2022-03-24 08:07:30 +00:00 committed by Rafael J. Wysocki
parent ae20cb9aec
commit ce1cb680ff
2 changed files with 39 additions and 34 deletions
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44
include/linux/suspend.h
View File

@ -542,22 +542,56 @@ static inline void unlock_system_sleep(void) {}
#ifdef CONFIG_PM_SLEEP_DEBUG
extern bool pm_print_times_enabled;
extern bool pm_debug_messages_on;
extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
static inline int pm_dyn_debug_messages_on(void)
{
#ifdef CONFIG_DYNAMIC_DEBUG
return 1;
#else
return 0;
#endif
}
#ifndef pr_fmt
#define pr_fmt(fmt) "PM: " fmt
#endif
#define __pm_pr_dbg(fmt, ...) \
do { \
if (pm_debug_messages_on) \
printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
else if (pm_dyn_debug_messages_on()) \
pr_debug(fmt, ##__VA_ARGS__); \
} while (0)
#define __pm_deferred_pr_dbg(fmt, ...) \
do { \
if (pm_debug_messages_on) \
printk_deferred(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
} while (0)
#else
#define pm_print_times_enabled (false)
#define pm_debug_messages_on (false)
#include <linux/printk.h>
#define __pm_pr_dbg(defer, fmt, ...) \
no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
#define __pm_pr_dbg(fmt, ...) \
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#define __pm_deferred_pr_dbg(fmt, ...) \
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#endif
/**
* pm_pr_dbg - print pm sleep debug messages
*
* If pm_debug_messages_on is enabled, print message.
* If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is enabled,
* print message only from instances explicitly enabled on dynamic debug's
* control.
* If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is disabled,
* don't print message.
*/
#define pm_pr_dbg(fmt, ...) \
__pm_pr_dbg(false, fmt, ##__VA_ARGS__)
__pm_pr_dbg(fmt, ##__VA_ARGS__)
#define pm_deferred_pr_dbg(fmt, ...) \
__pm_pr_dbg(true, fmt, ##__VA_ARGS__)
__pm_deferred_pr_dbg(fmt, ##__VA_ARGS__)
#ifdef CONFIG_PM_AUTOSLEEP

29
kernel/power/main.c
View File

@ -545,35 +545,6 @@ static int __init pm_debug_messages_setup(char *str)
}
__setup("pm_debug_messages", pm_debug_messages_setup);
/**
* __pm_pr_dbg - Print a suspend debug message to the kernel log.
* @defer: Whether or not to use printk_deferred() to print the message.
* @fmt: Message format.
*
* The message will be emitted if enabled through the pm_debug_messages
* sysfs attribute.
*/
void __pm_pr_dbg(bool defer, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
if (!pm_debug_messages_on)
return;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
if (defer)
printk_deferred(KERN_DEBUG "PM: %pV", &vaf);
else
printk(KERN_DEBUG "PM: %pV", &vaf);
va_end(args);
}
#else /* !CONFIG_PM_SLEEP_DEBUG */
static inline void pm_print_times_init(void) {}
#endif /* CONFIG_PM_SLEEP_DEBUG */