ARM: perf: move arm_pmu into <asm/pmu.h>

Currently, struct arm_pmu and related functions are only visible to
{,arch/arm/}/kernel/perf_event.c. This prevents new drivers from using
the framework.

This patch  moves declarations to asm/pmu.h, allowing new PMU drivers
to use the framework.

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>

2 files changed, 67 insertions, 50 deletions

diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h
index a06ba8773cd7..71d99b83cdb9 100644
--- a/arch/arm/include/asm/pmu.h
+++ b/arch/arm/include/asm/pmu.h
@@ -13,6 +13,7 @@
 #define __ARM_PMU_H__
 
 #include <linux/interrupt.h>
+#include <linux/perf_event.h>
 
 /*
  * Types of PMUs that can be accessed directly and require mutual
@@ -79,4 +80,67 @@ release_pmu(enum arm_pmu_type type)	{ }
 
 #endif /* CONFIG_CPU_HAS_PMU */
 
+#ifdef CONFIG_HW_PERF_EVENTS
+
+/* The events for a given PMU register set. */
+struct pmu_hw_events {
+        /*
+         * The events that are active on the PMU for the given index.
+         */
+        struct perf_event       **events;
+
+        /*
+         * A 1 bit for an index indicates that the counter is being used for
+         * an event. A 0 means that the counter can be used.
+         */
+        unsigned long           *used_mask;
+
+        /*
+         * Hardware lock to serialize accesses to PMU registers. Needed for the
+         * read/modify/write sequences.
+         */
+        raw_spinlock_t          pmu_lock;
+};
+
+struct arm_pmu {
+        struct pmu      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);
+        void            (*enable)(struct hw_perf_event *evt, int idx);
+        void            (*disable)(struct hw_perf_event *evt, int idx);
+        int             (*get_event_idx)(struct pmu_hw_events *hw_events,
+                                         struct hw_perf_event *hwc);
+        int             (*set_event_filter)(struct hw_perf_event *evt,
+                                            struct perf_event_attr *attr);
+        u32             (*read_counter)(int idx);
+        void            (*write_counter)(int idx, u32 val);
+        void            (*start)(void);
+        void            (*stop)(void);
+        void            (*reset)(void *);
+        int             (*map_event)(struct perf_event *event);
+        int             num_events;
+        atomic_t        active_events;
+        struct mutex    reserve_mutex;
+        u64             max_period;
+        struct platform_device  *plat_device;
+        struct pmu_hw_events    *(*get_hw_events)(void);
+};
+
+#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
+
+int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type);
+
+u64 armpmu_event_update(struct perf_event *event,
+                        struct hw_perf_event *hwc,
+                        int idx, int overflow);
+
+int armpmu_event_set_period(struct perf_event *event,
+                            struct hw_perf_event *hwc,
+                            int idx);
+
+#endif /* CONFIG_HW_PERF_EVENTS */
+
 #endif /* __ARM_PMU_H__ */
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 831513342d53..aaa631b8cbc2 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -37,57 +37,10 @@
  */
 #define ARMPMU_MAX_HWEVENTS             32
 
-/* The events for a given PMU register set. */
-struct pmu_hw_events {
-        /*
-         * The events that are active on the PMU for the given index.
-         */
-        struct perf_event       **events;
-
-        /*
-         * A 1 bit for an index indicates that the counter is being used for
-         * an event. A 0 means that the counter can be used.
-         */
-        unsigned long           *used_mask;
-
-        /*
-         * Hardware lock to serialize accesses to PMU registers. Needed for the
-         * read/modify/write sequences.
-         */
-        raw_spinlock_t          pmu_lock;
-};
-
 static DEFINE_PER_CPU(struct perf_event * [ARMPMU_MAX_HWEVENTS], hw_events);
 static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)], used_mask);
 static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events);
 
-struct arm_pmu {
-        struct pmu      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);
-        void            (*enable)(struct hw_perf_event *evt, int idx);
-        void            (*disable)(struct hw_perf_event *evt, int idx);
-        int             (*get_event_idx)(struct pmu_hw_events *hw_events,
-                                         struct hw_perf_event *hwc);
-        int             (*set_event_filter)(struct hw_perf_event *evt,
-                                            struct perf_event_attr *attr);
-        u32             (*read_counter)(int idx);
-        void            (*write_counter)(int idx, u32 val);
-        void            (*start)(void);
-        void            (*stop)(void);
-        void            (*reset)(void *);
-        int             (*map_event)(struct perf_event *event);
-        int             num_events;
-        atomic_t        active_events;
-        struct mutex    reserve_mutex;
-        u64             max_period;
-        struct platform_device  *plat_device;
-        struct pmu_hw_events    *(*get_hw_events)(void);
-};
-
 #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
 
 /* Set at runtime when we know what CPU type we are. */
@@ -194,7 +147,7 @@ static int map_cpu_event(struct perf_event *event,
         return -ENOENT;
 }
 
-static int
+int
 armpmu_event_set_period(struct perf_event *event,
                         struct hw_perf_event *hwc,
                         int idx)
@@ -230,7 +183,7 @@ armpmu_event_set_period(struct perf_event *event,
         return ret;
 }
 
-static u64
+u64
 armpmu_event_update(struct perf_event *event,
                     struct hw_perf_event *hwc,
                     int idx, int overflow)
@@ -646,7 +599,7 @@ static void __init armpmu_init(struct arm_pmu *armpmu)
         };
 }
 
-static int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type)
+int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type)
 {
         armpmu_init(armpmu);
         return perf_pmu_register(&armpmu->pmu, name, type);