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cbb72a3c19
If the CPU assigned to the xgene PMU is taken offline, then subsequent
perf invocations on the PMU will fail:
# echo 0 > /sys/devices/system/cpu/cpu0/online
# perf stat -a -e l3c0/cycle-count/,l3c0/write/ sleep 1
Error:
The sys_perf_event_open() syscall returned with 19 (No such device) for event (l3c0/cycle-count/).
/bin/dmesg may provide additional information.
No CONFIG_PERF_EVENTS=y kernel support configured?
This patch implements a hotplug notifier in the xgene PMU driver so that
the PMU context is migrated to another online CPU should its assigned
CPU disappear.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Hoan Tran <hoan.tran@amperecomputing.com>
[will: Made naming of new cpuhp_state enum entry consistent]
Signed-off-by: Will Deacon <will.deacon@arm.com>
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|---|---|---|
| .. | ||
| hisilicon | ||
| arm_dsu_pmu.c | ||
| arm_pmu_acpi.c | ||
| arm_pmu_platform.c | ||
| arm_pmu.c | ||
| arm_spe_pmu.c | ||
| arm-cci.c | ||
| arm-ccn.c | ||
| Kconfig | ||
| Makefile | ||
| qcom_l2_pmu.c | ||
| qcom_l3_pmu.c | ||
| xgene_pmu.c | ||