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POWERPC: pseries: cpuidle: use time keeping flag

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The current code computes the idle time but that can be handled
by the cpuidle framework if we enable the .en_core_tk_irqen flag.

Set the flag and remove the code related to the time computation.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Daniel Lezcano 2013-04-03 12:15:22 +00:00 committed by Rafael J. Wysocki
parent 561a07ac1c
commit 1ca8094403
1 changed files with 15 additions and 20 deletions
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35
arch/powerpc/platforms/pseries/processor_idle.c
View file

@ -23,8 +23,9 @@
#include "pseries.h"
struct cpuidle_driver pseries_idle_driver = {
.name = "pseries_idle",
.owner = THIS_MODULE,
.name = "pseries_idle",
.owner = THIS_MODULE,
.en_core_tk_irqen = 1,
};
#define MAX_IDLE_STATE_COUNT 2
@ -33,10 +34,8 @@ static int max_idle_state = MAX_IDLE_STATE_COUNT - 1;
static struct cpuidle_device __percpu *pseries_cpuidle_devices;
static struct cpuidle_state *cpuidle_state_table;
static inline void idle_loop_prolog(unsigned long *in_purr, ktime_t *kt_before)
static inline void idle_loop_prolog(unsigned long *in_purr)
{
*kt_before = ktime_get();
*in_purr = mfspr(SPRN_PURR);
/*
* Indicate to the HV that we are idle. Now would be
@ -45,12 +44,10 @@ static inline void idle_loop_prolog(unsigned long *in_purr, ktime_t *kt_before)
get_lppaca()->idle = 1;
}
static inline s64 idle_loop_epilog(unsigned long in_purr, ktime_t kt_before)
static inline void idle_loop_epilog(unsigned long in_purr)
{
get_lppaca()->wait_state_cycles += mfspr(SPRN_PURR) - in_purr;
get_lppaca()->idle = 0;
return ktime_to_us(ktime_sub(ktime_get(), kt_before));
}
static int snooze_loop(struct cpuidle_device *dev,
@ -58,10 +55,9 @@ static int snooze_loop(struct cpuidle_device *dev,
int index)
{
unsigned long in_purr;
ktime_t kt_before;
int cpu = dev->cpu;
idle_loop_prolog(&in_purr, &kt_before);
idle_loop_prolog(&in_purr);
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
@ -75,8 +71,8 @@ static int snooze_loop(struct cpuidle_device *dev,
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb();
dev->last_residency =
(int)idle_loop_epilog(in_purr, kt_before);
idle_loop_epilog(in_purr);
return index;
}
@ -102,9 +98,8 @@ static int dedicated_cede_loop(struct cpuidle_device *dev,
int index)
{
unsigned long in_purr;
ktime_t kt_before;
idle_loop_prolog(&in_purr, &kt_before);
idle_loop_prolog(&in_purr);
get_lppaca()->donate_dedicated_cpu = 1;
ppc64_runlatch_off();
@ -112,8 +107,9 @@ static int dedicated_cede_loop(struct cpuidle_device *dev,
check_and_cede_processor();
get_lppaca()->donate_dedicated_cpu = 0;
dev->last_residency =
(int)idle_loop_epilog(in_purr, kt_before);
idle_loop_epilog(in_purr);
return index;
}
@ -122,9 +118,8 @@ static int shared_cede_loop(struct cpuidle_device *dev,
int index)
{
unsigned long in_purr;
ktime_t kt_before;
idle_loop_prolog(&in_purr, &kt_before);
idle_loop_prolog(&in_purr);
/*
* Yield the processor to the hypervisor. We return if
@ -135,8 +130,8 @@ static int shared_cede_loop(struct cpuidle_device *dev,
*/
check_and_cede_processor();
dev->last_residency =
(int)idle_loop_epilog(in_purr, kt_before);
idle_loop_epilog(in_purr);
return index;
}