Subject: [PATCH 9/9] POWERPC: pseries: cpuidle: use time keeping flag

From: [email-masked] (Daniel Lezcano)
Date: Wed, 03 Apr 2013 16:25:54 +0200

On 04/03/2013 02:15 PM, Daniel Lezcano wrote:
> 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 <[email-masked]>
> Signed-off-by: Deepthi Dharwar <[email-masked]>
> ---

Rafael,

Deepthi took the patch, did a fix and tested it, this is why there is
its signed-off.

Deepthi, could you ack the patch for Rafael also ?

Thanks
-- Daniel

>  arch/powerpc/platforms/pseries/processor_idle.c |   35 ++++++++++-------------
>  1 file changed, 15 insertions(+), 20 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/processor_idle.c b/arch/powerpc/platforms/pseries/processor_idle.c
> index 4d806b4..a197120 100644
> --- a/arch/powerpc/platforms/pseries/processor_idle.c
> +++ b/arch/powerpc/platforms/pseries/processor_idle.c
> @@ -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;
>  }
>  

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