arm: pmu: allow platform specific irq enable/disable handling

This patch introduces .enable_irq and .disable_irq into
struct arm_pmu_platdata, so platform specific irq enablement
can be handled after request_irq, and platform specific irq
disablement can be handled before free_irq.

This patch is for support of  pmu irq routed from CTI on omap4.

Acked-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

2 files changed, 20 insertions, 5 deletions

diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h
index 0bda22c094a..b5a5be2536c 100644
--- a/arch/arm/include/asm/pmu.h
+++ b/arch/arm/include/asm/pmu.h
@@ -27,13 +27,22 @@ enum arm_pmu_type {
 /*
  * struct arm_pmu_platdata - ARM PMU platform data
  *
- * @handle_irq: an optional handler which will be called from the interrupt and
- * passed the address of the low level handler, and can be used to implement
- * any platform specific handling before or after calling it.
+ * @handle_irq: an optional handler which will be called from the
+ *      interrupt and passed the address of the low level handler,
+ *      and can be used to implement any platform specific handling
+ *      before or after calling it.
+ * @enable_irq: an optional handler which will be called after
+ *      request_irq and be used to handle some platform specific
+ *      irq enablement
+ * @disable_irq: an optional handler which will be called before
+ *      free_irq and be used to handle some platform specific
+ *      irq disablement
  */
 struct arm_pmu_platdata {
         irqreturn_t (*handle_irq)(int irq, void *dev,
                                   irq_handler_t pmu_handler);
+        void (*enable_irq)(int irq);
+        void (*disable_irq)(int irq);
 };
 
 #ifdef CONFIG_CPU_HAS_PMU
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index c475379199b..daa1db84452 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -380,6 +380,8 @@ armpmu_release_hardware(struct arm_pmu *armpmu)
 {
         int i, irq, irqs;
         struct platform_device *pmu_device = armpmu->plat_device;
+        struct arm_pmu_platdata *plat =
+                dev_get_platdata(&pmu_device->dev);
 
         irqs = min(pmu_device->num_resources, num_possible_cpus());
 
@@ -387,8 +389,11 @@ armpmu_release_hardware(struct arm_pmu *armpmu)
                 if (!cpumask_test_and_clear_cpu(i, &armpmu->active_irqs))
                         continue;
                 irq = platform_get_irq(pmu_device, i);
-                if (irq >= 0)
+                if (irq >= 0) {
+                        if (plat && plat->disable_irq)
+                                plat->disable_irq(irq);
                         free_irq(irq, armpmu);
+                }
         }
 
         release_pmu(armpmu->type);
@@ -448,7 +453,8 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
                                 irq);
                         armpmu_release_hardware(armpmu);
                         return err;
-                }
+                } else if (plat && plat->enable_irq)
+                        plat->enable_irq(irq);
 
                 cpumask_set_cpu(i, &armpmu->active_irqs);
         }