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Subject[PATCH v2 32/43] arm_pmu: Provide a mechanism for disabling the physical IRQ
Date
Arm CCA assigns the physical PMU device to the guest running in realm
world, however the IRQs are routed via the host. To enter a realm guest
while a PMU IRQ is pending it is necessary to block the physical IRQ to
prevent an immediate exit. Provide a mechanism in the PMU driver for KVM
to control the physical IRQ.

Signed-off-by: Steven Price <steven.price@arm.com>
---
drivers/perf/arm_pmu.c | 15 +++++++++++++++
include/linux/perf/arm_pmu.h | 1 +
2 files changed, 16 insertions(+)

diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 8458fe2cebb4..1e024acc98bb 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -735,6 +735,21 @@ static int arm_perf_teardown_cpu(unsigned int cpu, struct hlist_node *node)
return 0;
}

+void arm_pmu_set_phys_irq(bool enable)
+{
+ int cpu = get_cpu();
+ struct arm_pmu *pmu = per_cpu(cpu_armpmu, cpu);
+ int irq;
+
+ irq = armpmu_get_cpu_irq(pmu, cpu);
+ if (irq && !enable)
+ per_cpu(cpu_irq_ops, cpu)->disable_pmuirq(irq);
+ else if (irq && enable)
+ per_cpu(cpu_irq_ops, cpu)->enable_pmuirq(irq);
+
+ put_cpu();
+}
+
#ifdef CONFIG_CPU_PM
static void cpu_pm_pmu_setup(struct arm_pmu *armpmu, unsigned long cmd)
{
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index b3b34f6670cf..fd5e2e63b7fb 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -168,6 +168,7 @@ void kvm_host_pmu_init(struct arm_pmu *pmu);
#endif

bool arm_pmu_irq_is_nmi(void);
+void arm_pmu_set_phys_irq(bool enable);

/* Internal functions only for core arm_pmu code */
struct arm_pmu *armpmu_alloc(void);
--
2.34.1

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