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SubjectRe: [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@linux.vnet.ibm.com>

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.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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