linux-kernel - [PATCH v4 0/3] arm64: topology: Setup AMU FIE for online CPUs only

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Message-ID: <20250814072853.3426386-1-zhenglifeng1@huawei.com>
Date: Thu, 14 Aug 2025 15:28:50 +0800
From: Lifeng Zheng <zhenglifeng1@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <rafael@...nel.org>,
	<viresh.kumar@...aro.org>, <beata.michalska@....com>, <sudeep.holla@....com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
	<jonathan.cameron@...wei.com>, <vincent.guittot@...aro.org>,
	<yangyicong@...ilicon.com>, <zhanjie9@...ilicon.com>, <lihuisong@...wei.com>,
	<yubowen8@...wei.com>, <linhongye@...artners.com>, <zhenglifeng1@...wei.com>
Subject: [PATCH v4 0/3] arm64: topology: Setup AMU FIE for online CPUs only

Solve a problem that causes CPUs Setup AMU FIE failed in a corner case,
even though they're eligible.

Changelog:

v4:

 - change the function's name in patch 2 from
   'cpufreq_cpu_get_raw_no_check' to 'cpufreq_cpu_policy'
 - use only one line in the function body of cpufreq_cpu_policy()
 - use cpus mask instead of related_cpus when calling arch_set_freq_scale()
   in cpufreq.c
 - add a warning when the freq_counters_valid() check fails in
   cpuhp_topology_online()

v3:

 - add a patch to optimize amu_fie_setup()
 - add a patch to add a function to get cpufreq policy without checking if
   the CPU is online
 - discard the reuse of amu_fie_setup() in cpuhp_topology_online() and keep
   all the new logic in cpuhp_topology_online()
 - test only the CPU which is going online in cpuhp_topology_online()
 - when the freq_counters_valid() check fails, not only clear the scale
   freq source but also clear all the related CPUs from amu_fie_cpus mask
 - add some comments

v2:

 - keep init_amu_fie_notifier for setting up AMU FIE when the cpufreq
   policy is being created
 - set up AMU FIE only for online CPUs instead of related_cpus in
   init_amu_fie_callback()
 - check and set all the online CPUs in the same policy when hotplug one
 - clear scale freq source for all the online CPUs in the same policy to
   avoid using different source of the freq scale

---
Discussions of previous version:
v1: https://lore.kernel.org/all/20250607094533.416368-1-zhenglifeng1@huawei.com/
v2: https://lore.kernel.org/all/20250725102813.1404322-1-zhenglifeng1@huawei.com/
v3: https://lore.kernel.org/all/20250805093330.3715444-1-zhenglifeng1@huawei.com/

Lifeng Zheng (3):
  arm64: topology: Set scale freq source only for the CPUs that have not
    been set before
  cpufreq: Add a new function to get cpufreq policy without checking if
    the CPU is online
  arm64: topology: Setup AMU FIE for online CPUs only

 arch/arm64/kernel/topology.c | 56 ++++++++++++++++++++++++++++++++++--
 drivers/cpufreq/cpufreq.c    | 10 +++++--
 include/linux/cpufreq.h      |  1 +
 3 files changed, 62 insertions(+), 5 deletions(-)

-- 
2.33.0