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fpga: dfl: fme: Fix cpu hotplug issue in performance reporting

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The performance reporting driver added cpu hotplug
feature but it didn't add pmu migration call in cpu
offline function.
This can create an issue incase the current designated
cpu being used to collect fme pmu data got offline,
as based on current code we are not migrating fme pmu to
new target cpu. Because of that perf will still try to
fetch data from that offline cpu and hence we will not
get counter data.

Patch fixed this issue by adding pmu_migrate_context call
in fme_perf_offline_cpu function.

Fixes: 724142f8c4 ("fpga: dfl: fme: add performance reporting support")
Cc: stable@vger.kernel.org
Tested-by: Xu Yilun <yilun.xu@intel.com>
Acked-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
This commit is contained in:
Kajol Jain 2021-07-13 13:12:16 +05:30 committed by Moritz Fischer
parent ff1176468d
commit ec6446d530
1 changed files with 2 additions and 0 deletions
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2
drivers/fpga/dfl-fme-perf.c
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@ -953,6 +953,8 @@ static int fme_perf_offline_cpu(unsigned int cpu, struct hlist_node *node)
return 0;
priv->cpu = target;
perf_pmu_migrate_context(&priv->pmu, cpu, target);
return 0;
}