arm64: topology: Handle AMU FIE setup on CPU hotplug

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Currently, when a cpufreq policy is created, the AMU FIE setup process
checks all CPUs in the policy -- including those that are offline. If any
of these CPUs are offline at that time, their AMU capability flag hasn't
been verified yet, leading the check fail. As a result, AMU FIE is not
enabled, even if the CPUs that are online do support it.

Later, when the previously offline CPUs come online and report AMU support,
there's no mechanism in place to re-enable AMU FIE for the policy. This
leaves the entire frequency domain without AMU FIE, despite being eligible.

Restrict the initial AMU FIE check to only those CPUs that are online at
the time the policy is created, and allow CPUs that come online later to
join the policy with AMU FIE enabled.

Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Acked-by: Beata Michalska <beata.michalska@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

...

This commit is contained in:

Lifeng Zheng 2025-11-19 16:13:56 +08:00 • committed by Will Deacon

parent 4221504c43

commit 6fd9be0b7b

2 changed files with 71 additions and 3 deletions

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65

arch/arm64/kernel/topology.c

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9

drivers/base/arch_topology.c

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