Re: [PATCH v2 3/4] cpufreq/amd-pstate: Update asym_prefer_cpu when core rankings change

[Mario Limonciello]

On 4/9/2025 12:34 AM, K Prateek Nayak wrote:
> A subset of AMD systems supporting Preferred Core rankings can have
> their rankings changed dynamically at runtime. Update the
> "sg->asym_prefer_cpu" across the local hierarchy of CPU when the
> preferred core ranking changes.
>
> Signed-off-by: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Acked-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> ---
>   drivers/cpufreq/amd-pstate.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 6789eed1bb5b..8796217ccc60 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -844,8 +844,10 @@ static void amd_pstate_update_limits(unsigned int cpu)
>   	if (highest_perf_changed) {
>   		WRITE_ONCE(cpudata->prefcore_ranking, cur_high);
>   
> -		if (cur_high < CPPC_MAX_PERF)
> +		if (cur_high < CPPC_MAX_PERF) {
>   			sched_set_itmt_core_prio((int)cur_high, cpu);
> +			sched_update_asym_prefer_cpu(cpu, prev_high, cur_high);
> +		}
>   	}
>   }
>