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PM: Make PM_TRACE more architecture independent

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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>
This commit is contained in:
Johannes Berg 2007-11-19 23:46:16 +01:00 committed by Len Brown
parent ce2b7147bb
commit 90dda1cb6a
2 changed files with 23 additions and 2 deletions
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2
drivers/base/power/Makefile
View file

@ -1,6 +1,6 @@
obj-$(CONFIG_PM) += sysfs.o
obj-$(CONFIG_PM_SLEEP) += main.o
obj-$(CONFIG_PM_TRACE) += trace.o
obj-$(CONFIG_PM_TRACE_RTC) += trace.o
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
ccflags-$(CONFIG_PM_VERBOSE) += -DDEBUG

23
kernel/power/Kconfig
View file

@ -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