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powerpc/cpuidle: Handle power_save=off

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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>
This commit is contained in:
Deepthi Dharwar 2011-11-30 02:47:03 +00:00 committed by Benjamin Herrenschmidt
parent e179816ce6
commit e8bb3e00cf
2 changed files with 4 additions and 0 deletions
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1
arch/powerpc/include/asm/processor.h
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@ -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__ */

3
arch/powerpc/platforms/pseries/processor_idle.c
View File

@ -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;