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Commit e8bb3e00 authored Nov 30, 2011 by Deepthi Dharwar Committed by Benjamin Herrenschmidt Dec 08, 2011

powerpc/cpuidle: Handle power_save=off



This patch makes pseries_idle_driver not to be registered when
power_save=off kernel boot option is specified. The
cpuidle_disable variable used here is similar to
its usage on x86. If cpuidle_disable is set then
sysfs entries for cpuidle framework are not created
and the required drivers are not loaded.

Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Trinabh Gupta <g.trinabh@gmail.com>
Signed-off-by: Arun R Bharadwaj <arun.r.bharadwaj@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent e179816c

arch/powerpc/include/asm/processor.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -382,6 +382,7 @@ static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
	}		}
	#endif		#endif

			extern unsigned long cpuidle_disable;
	enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};		enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};

	#endif /* __KERNEL__ */		#endif /* __KERNEL__ */

arch/powerpc/platforms/pseries/processor_idle.c

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -269,6 +269,9 @@ static int pseries_idle_probe(void)
	if (!firmware_has_feature(FW_FEATURE_SPLPAR))		if (!firmware_has_feature(FW_FEATURE_SPLPAR))
	return -ENODEV;		return -ENODEV;

			if (cpuidle_disable != IDLE_NO_OVERRIDE)
			return -ENODEV;

	if (max_idle_state == 0) {		if (max_idle_state == 0) {
	printk(KERN_DEBUG "pseries processor idle disabled.\n");		printk(KERN_DEBUG "pseries processor idle disabled.\n");
	return -EPERM;		return -EPERM;