[PATCH] ARM: perf: add PMU hotplug notifier
Will Deacon
will.deacon at arm.com
Thu Feb 23 10:41:59 EST 2012
From: Lorenzo Pieralisi <Lorenzo.Pieralisi at arm.com>
When a CPU is taken out of reset, either cold booted or hotplugged in,
some of its PMU registers can contain UNKNOWN values.
This patch adds a hotplug notifier to ARM core perf code so that upon
CPU restart the PMU unit is reset and becomes ready to use again.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
Signed-off-by: Will Deacon <will.deacon at arm.com>
---
arch/arm/kernel/perf_event.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index ab59c3b..fa30ff9 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -680,6 +680,28 @@ static void __init cpu_pmu_init(struct arm_pmu *armpmu)
}
/*
+ * PMU hardware loses all context when a CPU goes offline.
+ * When a CPU is hotplugged back in, since some hardware registers are
+ * UNKNOWN at reset, the PMU must be explicitly reset to avoid reading
+ * junk values out of them.
+ */
+static int __cpuinit pmu_cpu_notify(struct notifier_block *b,
+ unsigned long action, void *hcpu)
+{
+ if (action != CPU_UP_PREPARE)
+ return NOTIFY_DONE;
+
+ if (cpu_pmu && cpu_pmu->reset)
+ cpu_pmu->reset(NULL);
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata pmu_cpu_notifier = {
+ .notifier_call = pmu_cpu_notify,
+};
+
+/*
* CPU PMU identification and registration.
*/
static int __init
@@ -733,6 +755,7 @@ init_hw_perf_events(void)
pr_info("enabled with %s PMU driver, %d counters available\n",
cpu_pmu->name, cpu_pmu->num_events);
cpu_pmu_init(cpu_pmu);
+ register_cpu_notifier(&pmu_cpu_notifier);
armpmu_register(cpu_pmu, "cpu", PERF_TYPE_RAW);
} else {
pr_info("no hardware support available\n");
--
1.7.4.1
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