linux-kernel - [PATCH v2 3/4] cpufreq/amd-pstate: Update asym_prefer

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Message-ID: <20250409053446.23367-4-kprateek.nayak@amd.com>
Date: Wed, 9 Apr 2025 05:34:45 +0000
From: K Prateek Nayak <kprateek.nayak@....com>
To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot
	<vincent.guittot@...aro.org>, "Gautham R. Shenoy" <gautham.shenoy@....com>,
	Mario Limonciello <mario.limonciello@....com>, "Rafael J. Wysocki"
	<rafael@...nel.org>, Viresh Kumar <viresh.kumar@...aro.org>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt
	<rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman
	<mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>, Waiman Long
	<llong@...hat.com>, Swapnil Sapkal <swapnil.sapkal@....com>, "Dhananjay
 Ugwekar" <Dhananjay.Ugwekar@....com>, Huang Rui <ray.huang@....com>, "Perry
 Yuan" <perry.yuan@....com>, K Prateek Nayak <kprateek.nayak@....com>
Subject: [PATCH v2 3/4] cpufreq/amd-pstate: Update asym_prefer_cpu when core rankings change

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@....com>
---
 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);
+		}
 	}
 }
 
-- 
2.34.1