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cpufreq/amd-pstate: Update asym_prefer_cpu when core rankings change

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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@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20250409053446.23367-4-kprateek.nayak@amd.com
This commit is contained in:
K Prateek Nayak 2025-04-09 05:34:45 +00:00 committed by Peter Zijlstra
parent 0e3f6c3696
commit 8157fbc907
1 changed files with 3 additions and 1 deletions
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4
drivers/cpufreq/amd-pstate.c
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@ -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);
}
}
}