linux-kernel - Re: [PATCH V7 6/7] POWER/cpuidle: Enable powernv cpuidle support.

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Date:	Wed, 06 Nov 2013 22:06:38 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>,
	benh@...nel.crashing.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
CC:	michael@...erman.id.au, scottwood@...escale.com,
	srivatsa.bhat@...ux.vnet.ibm.com, preeti@...ux.vnet.ibm.com,
	linux-pm@...ts.linux-foundation.org, svaidy@...ux.vnet.ibm.com
Subject: Re: [PATCH V7 6/7] POWER/cpuidle: Enable powernv cpuidle support.

On 10/29/2013 12:01 PM, Deepthi Dharwar wrote:
> The following patch extends the current power backend
> idle driver to the powernv platform.
>
> Signed-off-by: Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

> ---
>   drivers/cpuidle/cpuidle-ibm-power.c |   39 ++++++++++++++++++++++++++++++++---
>   1 file changed, 36 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/cpuidle/cpuidle-ibm-power.c b/drivers/cpuidle/cpuidle-ibm-power.c
> index 5b92242..f790ea2 100644
> --- a/drivers/cpuidle/cpuidle-ibm-power.c
> +++ b/drivers/cpuidle/cpuidle-ibm-power.c
> @@ -52,9 +52,10 @@ static int snooze_loop(struct cpuidle_device *dev,
>   			struct cpuidle_driver *drv,
>   			int index)
>   {
> -	unsigned long in_purr;
> +	unsigned long in_purr = 0;
>
> -	idle_loop_prolog(&in_purr);
> +	if (firmware_has_feature(FW_FEATURE_SPLPAR))
> +		idle_loop_prolog(&in_purr);
>   	local_irq_enable();
>   	set_thread_flag(TIF_POLLING_NRFLAG);
>
> @@ -68,7 +69,8 @@ static int snooze_loop(struct cpuidle_device *dev,
>   	clear_thread_flag(TIF_POLLING_NRFLAG);
>   	smp_mb();
>
> -	idle_loop_epilog(in_purr);
> +	if (firmware_has_feature(FW_FEATURE_SPLPAR))
> +		idle_loop_epilog(in_purr);
>
>   	return index;
>   }
> @@ -132,6 +134,15 @@ static int shared_cede_loop(struct cpuidle_device *dev,
>   	return index;
>   }
>
> +static int nap_loop(struct cpuidle_device *dev,
> +			struct cpuidle_driver *drv,
> +			int index)
> +{
> +	ppc64_runlatch_off();
> +	power7_idle();
> +	return index;
> +}
> +
>   /*
>    * States for dedicated partition case.
>    */
> @@ -165,6 +176,23 @@ static struct cpuidle_state shared_states[] = {
>   		.enter = &shared_cede_loop },
>   };
>
> +static struct cpuidle_state powernv_states[] = {
> +	{ /* Snooze */
> +		.name = "snooze",
> +		.desc = "snooze",
> +		.flags = CPUIDLE_FLAG_TIME_VALID,
> +		.exit_latency = 0,
> +		.target_residency = 0,
> +		.enter = &snooze_loop },
> +	{ /* NAP */
> +		.name = "NAP",
> +		.desc = "NAP",
> +		.flags = CPUIDLE_FLAG_TIME_VALID,
> +		.exit_latency = 10,
> +		.target_residency = 100,
> +		.enter = &nap_loop },
> +};
> +
>   void update_smt_snooze_delay(int cpu, int residency)
>   {
>   	struct cpuidle_driver *drv = cpuidle_get_driver();
> @@ -258,6 +286,11 @@ static int power_idle_probe(void)
>   			cpuidle_state_table = dedicated_states;
>   			max_idle_state = ARRAY_SIZE(dedicated_states);
>   		}
> +
> +	} else if (firmware_has_feature(FW_FEATURE_OPALv3)) {
> +		cpuidle_state_table = powernv_states;
> +		max_idle_state = ARRAY_SIZE(powernv_states);
> +
>   	} else
>   		return -ENODEV;
>
>


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