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authorSumit Garg <sumit.garg@linaro.org>2020-10-07 10:51:43 +0200
committerWill Deacon <will@kernel.org>2020-11-25 16:18:39 +0100
commit367c820ef08082e68df8a3bc12e62393af21e4b5 (patch)
tree9388278f38941afced7096bf9b16a0fe9c9a0530 /drivers/perf
parentperf/imx_ddr: Add stop event counters support for i.MX8MP (diff)
downloadlinux-367c820ef08082e68df8a3bc12e62393af21e4b5.tar.xz
linux-367c820ef08082e68df8a3bc12e62393af21e4b5.zip
arm64: Enable perf events based hard lockup detector
With the recent feature added to enable perf events to use pseudo NMIs as interrupts on platforms which support GICv3 or later, its now been possible to enable hard lockup detector (or NMI watchdog) on arm64 platforms. So enable corresponding support. One thing to note here is that normally lockup detector is initialized just after the early initcalls but PMU on arm64 comes up much later as device_initcall(). So we need to re-initialize lockup detection once PMU has been initialized. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> Acked-by: Alexandru Elisei <alexandru.elisei@arm.com> Link: https://lore.kernel.org/r/1602060704-10921-1-git-send-email-sumit.garg@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm_pmu.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index cb2f55f450e4..794a37d50853 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -726,6 +726,11 @@ static int armpmu_get_cpu_irq(struct arm_pmu *pmu, int cpu)
return per_cpu(hw_events->irq, cpu);
}
+bool arm_pmu_irq_is_nmi(void)
+{
+ return has_nmi;
+}
+
/*
* PMU hardware loses all context when a CPU goes offline.
* When a CPU is hotplugged back in, since some hardware registers are