ARM: perf: add type field to struct arm_pmu

Currently, the ARM perf code assumes all PMUs it will handle are
CPU PMUs, having ARM_PMU_DEVICE_CPU hardcoded when reserving or
releasing hardware. This means that currently, the ARM perf code can't
support system PMUs.

This patch adds a 'type' field to struct arm_pmu, which allows the code
to reserve & release the hardware regardless of the PMU type.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Ashwin Chaugule <ashwinc@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 9331d5731445..1a2ebbf07fb7 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -60,6 +60,7 @@ static DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events);
 
 struct arm_pmu {
         enum arm_perf_pmu_ids id;
+        enum arm_pmu_type type;
         cpumask_t       active_irqs;
         const char      *name;
         irqreturn_t     (*handle_irq)(int irq_num, void *dev);
@@ -396,7 +397,7 @@ armpmu_release_hardware(void)
                         free_irq(irq, NULL);
         }
 
-        release_pmu(ARM_PMU_DEVICE_CPU);
+        release_pmu(armpmu->type);
 }
 
 static int
@@ -407,7 +408,7 @@ armpmu_reserve_hardware(void)
         int i, err, irq, irqs;
         struct platform_device *pmu_device = armpmu->plat_device;
 
-        err = reserve_pmu(ARM_PMU_DEVICE_CPU);
+        err = reserve_pmu(armpmu->type);
         if (err) {
                 pr_warning("unable to reserve pmu\n");
                 return err;
@@ -691,6 +692,7 @@ static void __init cpu_pmu_init(struct arm_pmu *armpmu)
                 raw_spin_lock_init(&events->pmu_lock);
         }
         armpmu->get_hw_events = armpmu_get_cpu_events;
+        armpmu->type = ARM_PMU_DEVICE_CPU;
 }
 
 /*