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authorJohannes Berg <johannes@sipsolutions.net>2007-11-19 23:46:16 +0100
committerLen Brown <len.brown@intel.com>2008-02-01 18:30:54 -0500
commit90dda1cb6ace6abd777f84bf051c4f86fa58986a (patch)
treeb53a566118e5e130a55707bea6d01e112508c8df /kernel
parentce2b7147bb83b7d729b17c1638f092a1bcba4981 (diff)
PM: Make PM_TRACE more architecture independent
When trying to debug a suspend failure I started implementing PM_TRACE for powerpc. I then noticed that I'm debugging a suspend failure and so PM_TRACE isn't useful at all, but thought that nonetheless this could be useful in the future. Basically, to support PM_TRACE, you add a Kconfig option that selects PM_TRACE and provides the infrastructure as per the help text of PM_TRACE. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/Kconfig23
1 files changed, 22 insertions, 1 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 8e186c67814..06a08f7cebd 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -44,9 +44,30 @@ config PM_VERBOSE
---help---
This option enables verbose messages from the Power Management code.
+config CAN_PM_TRACE
+ def_bool y
+ depends on PM_DEBUG && PM_SLEEP && EXPERIMENTAL
+
config PM_TRACE
+ bool
+ help
+ This enables code to save the last PM event point across
+ reboot. The architecture needs to support this, x86 for
+ example does by saving things in the RTC, see below.
+
+ The architecture specific code must provide the extern
+ functions from <linux/resume-trace.h> as well as the
+ <asm/resume-trace.h> header with a TRACE_RESUME() macro.
+
+ The way the information is presented is architecture-
+ dependent, x86 will print the information during a
+ late_initcall.
+
+config PM_TRACE_RTC
bool "Suspend/resume event tracing"
- depends on PM_DEBUG && X86 && PM_SLEEP && EXPERIMENTAL
+ depends on CAN_PM_TRACE
+ depends on X86
+ select PM_TRACE
default n
---help---
This enables some cheesy code to save the last PM event point in the