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drivers/perf: hisi: Migrate to one online CPU if no associated one online

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If the selected CPU hisi_pmu::on_cpu goes offline, driver will select
a new online CPU from hisi_pmu::associated_cpus, or if no online CPU
found the PMU context won't be migrated. However for uncore PMUs the
associated CPUs are just a peference and it also works to schedule
the events on any online CPUs. So add a fallback to choose an online
CPU if no associated CPUs found.

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20241210141525.37788-4-yangyicong@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Yicong Yang 2024-12-10 22:15:18 +08:00 committed by Will Deacon
parent f2368a209a
commit 83037a47d3
1 changed files with 8 additions and 1 deletions
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9
drivers/perf/hisilicon/hisi_uncore_pmu.c
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@ -499,9 +499,16 @@ int hisi_uncore_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
/* Give up ownership of the PMU */
hisi_pmu->on_cpu = -1;
/* Choose a new CPU to migrate ownership of the PMU to */
/*
* Migrate ownership of the PMU to a new CPU chosen from PMU's online
* associated CPUs if possible, if no associated CPU online then
* migrate to one online CPU.
*/
target = cpumask_any_and_but(&hisi_pmu->associated_cpus,
cpu_online_mask, cpu);
if (target >= nr_cpu_ids)
target = cpumask_any_but(cpu_online_mask, cpu);
if (target >= nr_cpu_ids)
return 0;