arm: perf: factor arm_pmu core out to drivers

To enable sharing of the arm_pmu code with arm64, this patch factors it
out to drivers/perf/. A new drivers/perf directory is added for
performance monitor drivers to live under.

MAINTAINERS is updated accordingly. Files added previously without a
corresponsing MAINTAINERS update (perf_regs.c, perf_callchain.c, and
perf_event.h) are also added.

Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
[will: augmented Kconfig help slightly]
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 154 insertions, 0 deletions

diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
new file mode 100644
index 000000000000..bfa673bb822d
--- /dev/null
+++ b/include/linux/perf/arm_pmu.h
@@ -0,0 +1,154 @@
+/*
+ *  linux/arch/arm/include/asm/pmu.h
+ *
+ *  Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __ARM_PMU_H__
+#define __ARM_PMU_H__
+
+#include <linux/interrupt.h>
+#include <linux/perf_event.h>
+
+#include <asm/cputype.h>
+
+/*
+ * 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.
+ */
+struct arm_pmu_platdata {
+        irqreturn_t (*handle_irq)(int irq, void *dev,
+                                  irq_handler_t pmu_handler);
+};
+
+#ifdef CONFIG_ARM_PMU
+
+/*
+ * The ARMv7 CPU PMU supports up to 32 event counters.
+ */
+#define ARMPMU_MAX_HWEVENTS             32
+
+#define HW_OP_UNSUPPORTED               0xFFFF
+#define C(_x)                           PERF_COUNT_HW_CACHE_##_x
+#define CACHE_OP_UNSUPPORTED            0xFFFF
+
+#define PERF_MAP_ALL_UNSUPPORTED                                        \
+        [0 ... PERF_COUNT_HW_MAX - 1] = HW_OP_UNSUPPORTED
+
+#define PERF_CACHE_MAP_ALL_UNSUPPORTED                                  \
+[0 ... C(MAX) - 1] = {                                                  \
+        [0 ... C(OP_MAX) - 1] = {                                       \
+                [0 ... C(RESULT_MAX) - 1] = CACHE_OP_UNSUPPORTED,       \
+        },                                                              \
+}
+
+/* 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[ARMPMU_MAX_HWEVENTS];
+
+        /*
+         * 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.
+         */
+        DECLARE_BITMAP(used_mask, ARMPMU_MAX_HWEVENTS);
+
+        /*
+         * Hardware lock to serialize accesses to PMU registers. Needed for the
+         * read/modify/write sequences.
+         */
+        raw_spinlock_t          pmu_lock;
+
+        /*
+         * When using percpu IRQs, we need a percpu dev_id. Place it here as we
+         * already have to allocate this struct per cpu.
+         */
+        struct arm_pmu          *percpu_pmu;
+};
+
+struct arm_pmu {
+        struct pmu      pmu;
+        cpumask_t       active_irqs;
+        cpumask_t       supported_cpus;
+        int             *irq_affinity;
+        char            *name;
+        irqreturn_t     (*handle_irq)(int irq_num, void *dev);
+        void            (*enable)(struct perf_event *event);
+        void            (*disable)(struct perf_event *event);
+        int             (*get_event_idx)(struct pmu_hw_events *hw_events,
+                                         struct perf_event *event);
+        void            (*clear_event_idx)(struct pmu_hw_events *hw_events,
+                                         struct perf_event *event);
+        int             (*set_event_filter)(struct hw_perf_event *evt,
+                                            struct perf_event_attr *attr);
+        u32             (*read_counter)(struct perf_event *event);
+        void            (*write_counter)(struct perf_event *event, u32 val);
+        void            (*start)(struct arm_pmu *);
+        void            (*stop)(struct arm_pmu *);
+        void            (*reset)(void *);
+        int             (*request_irq)(struct arm_pmu *, irq_handler_t handler);
+        void            (*free_irq)(struct arm_pmu *);
+        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    __percpu *hw_events;
+        struct notifier_block   hotplug_nb;
+};
+
+#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
+
+int armpmu_register(struct arm_pmu *armpmu, int type);
+
+u64 armpmu_event_update(struct perf_event *event);
+
+int armpmu_event_set_period(struct perf_event *event);
+
+int armpmu_map_event(struct perf_event *event,
+                     const unsigned (*event_map)[PERF_COUNT_HW_MAX],
+                     const unsigned (*cache_map)[PERF_COUNT_HW_CACHE_MAX]
+                                                [PERF_COUNT_HW_CACHE_OP_MAX]
+                                                [PERF_COUNT_HW_CACHE_RESULT_MAX],
+                     u32 raw_event_mask);
+
+struct pmu_probe_info {
+        unsigned int cpuid;
+        unsigned int mask;
+        int (*init)(struct arm_pmu *);
+};
+
+#define PMU_PROBE(_cpuid, _mask, _fn)   \
+{                                       \
+        .cpuid = (_cpuid),              \
+        .mask = (_mask),                \
+        .init = (_fn),                  \
+}
+
+#define ARM_PMU_PROBE(_cpuid, _fn) \
+        PMU_PROBE(_cpuid, ARM_CPU_PART_MASK, _fn)
+
+#define ARM_PMU_XSCALE_MASK     ((0xff << 24) | ARM_CPU_XSCALE_ARCH_MASK)
+
+#define XSCALE_PMU_PROBE(_version, _fn) \
+        PMU_PROBE(ARM_CPU_IMP_INTEL << 24 | _version, ARM_PMU_XSCALE_MASK, _fn)
+
+int arm_pmu_device_probe(struct platform_device *pdev,
+                         const struct of_device_id *of_table,
+                         const struct pmu_probe_info *probe_table);
+
+#endif /* CONFIG_ARM_PMU */
+
+#endif /* __ARM_PMU_H__ */