include/linux/perf/arm_pmu.h

   1 /*
   2  *  linux/arch/arm/include/asm/pmu.h
   3  *
   4  *  Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #ifndef __ARM_PMU_H__
  13 #define __ARM_PMU_H__
  14
  15 #include <linux/interrupt.h>
  16 #include <linux/perf_event.h>
  17
  18 #include <asm/cputype.h>
  19
  20 /*
  21  * struct arm_pmu_platdata - ARM PMU platform data
  22  *
  23  * @handle_irq: an optional handler which will be called from the
  24  *      interrupt and passed the address of the low level handler,
  25  *      and can be used to implement any platform specific handling
  26  *      before or after calling it.
  27  */
  28 struct arm_pmu_platdata {
  29         irqreturn_t (*handle_irq)(int irq, void *dev,
  30                                   irq_handler_t pmu_handler);
  31 };
  32
  33 #ifdef CONFIG_ARM_PMU
  34
  35 /*
  36  * The ARMv7 CPU PMU supports up to 32 event counters.
  37  */
  38 #define ARMPMU_MAX_HWEVENTS             32
  39
  40 #define HW_OP_UNSUPPORTED               0xFFFF
  41 #define C(_x)                           PERF_COUNT_HW_CACHE_##_x
  42 #define CACHE_OP_UNSUPPORTED            0xFFFF
  43
  44 #define PERF_MAP_ALL_UNSUPPORTED                                        \
  45         [0 ... PERF_COUNT_HW_MAX - 1] = HW_OP_UNSUPPORTED
  46
  47 #define PERF_CACHE_MAP_ALL_UNSUPPORTED                                  \
  48 [0 ... C(MAX) - 1] = {                                                  \
  49         [0 ... C(OP_MAX) - 1] = {                                       \
  50                 [0 ... C(RESULT_MAX) - 1] = CACHE_OP_UNSUPPORTED,       \
  51         },                                                              \
  52 }
  53
  54 /* The events for a given PMU register set. */
  55 struct pmu_hw_events {
  56         /*
  57          * The events that are active on the PMU for the given index.
  58          */
  59         struct perf_event       *events[ARMPMU_MAX_HWEVENTS];
  60
  61         /*
  62          * A 1 bit for an index indicates that the counter is being used for
  63          * an event. A 0 means that the counter can be used.
  64          */
  65         DECLARE_BITMAP(used_mask, ARMPMU_MAX_HWEVENTS);
  66
  67         /*
  68          * Hardware lock to serialize accesses to PMU registers. Needed for the
  69          * read/modify/write sequences.
  70          */
  71         raw_spinlock_t          pmu_lock;
  72
  73         /*
  74          * When using percpu IRQs, we need a percpu dev_id. Place it here as we
  75          * already have to allocate this struct per cpu.
  76          */
  77         struct arm_pmu          *percpu_pmu;
  78 };
  79
  80 struct arm_pmu {
  81         struct pmu      pmu;
  82         cpumask_t       active_irqs;
  83         cpumask_t       supported_cpus;
  84         int             *irq_affinity;
  85         char            *name;
  86         irqreturn_t     (*handle_irq)(int irq_num, void *dev);
  87         void            (*enable)(struct perf_event *event);
  88         void            (*disable)(struct perf_event *event);
  89         int             (*get_event_idx)(struct pmu_hw_events *hw_events,
  90                                          struct perf_event *event);
  91         void            (*clear_event_idx)(struct pmu_hw_events *hw_events,
  92                                          struct perf_event *event);
  93         int             (*set_event_filter)(struct hw_perf_event *evt,
  94                                             struct perf_event_attr *attr);
  95         u32             (*read_counter)(struct perf_event *event);
  96         void            (*write_counter)(struct perf_event *event, u32 val);
  97         void            (*start)(struct arm_pmu *);
  98         void            (*stop)(struct arm_pmu *);
  99         void            (*reset)(void *);
 100         int             (*request_irq)(struct arm_pmu *, irq_handler_t handler);
 101         void            (*free_irq)(struct arm_pmu *);
 102         int             (*map_event)(struct perf_event *event);
 103         int             num_events;
 104         atomic_t        active_events;
 105         struct mutex    reserve_mutex;
 106         u64             max_period;
 107         bool            secure_access; /* 32-bit ARM only */
 108 #define ARMV8_PMUV3_MAX_COMMON_EVENTS 0x40
 109         DECLARE_BITMAP(pmceid_bitmap, ARMV8_PMUV3_MAX_COMMON_EVENTS);
 110         struct platform_device  *plat_device;
 111         struct pmu_hw_events    __percpu *hw_events;
 112         struct hlist_node       node;
 113         struct notifier_block   cpu_pm_nb;
 114 };
 115
 116 #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
 117
 118 u64 armpmu_event_update(struct perf_event *event);
 119
 120 int armpmu_event_set_period(struct perf_event *event);
 121
 122 int armpmu_map_event(struct perf_event *event,
 123                      const unsigned (*event_map)[PERF_COUNT_HW_MAX],
 124                      const unsigned (*cache_map)[PERF_COUNT_HW_CACHE_MAX]
 125                                                 [PERF_COUNT_HW_CACHE_OP_MAX]
 126                                                 [PERF_COUNT_HW_CACHE_RESULT_MAX],
 127                      u32 raw_event_mask);
 128
 129 struct pmu_probe_info {
 130         unsigned int cpuid;
 131         unsigned int mask;
 132         int (*init)(struct arm_pmu *);
 133 };
 134
 135 #define PMU_PROBE(_cpuid, _mask, _fn)   \
 136 {                                       \
 137         .cpuid = (_cpuid),              \
 138         .mask = (_mask),                \
 139         .init = (_fn),                  \
 140 }
 141
 142 #define ARM_PMU_PROBE(_cpuid, _fn) \
 143         PMU_PROBE(_cpuid, ARM_CPU_PART_MASK, _fn)
 144
 145 #define ARM_PMU_XSCALE_MASK     ((0xff << 24) | ARM_CPU_XSCALE_ARCH_MASK)
 146
 147 #define XSCALE_PMU_PROBE(_version, _fn) \
 148         PMU_PROBE(ARM_CPU_IMP_INTEL << 24 | _version, ARM_PMU_XSCALE_MASK, _fn)
 149
 150 int arm_pmu_device_probe(struct platform_device *pdev,
 151                          const struct of_device_id *of_table,
 152                          const struct pmu_probe_info *probe_table);
 153
 154 #endif /* CONFIG_ARM_PMU */
 155
 156 #endif /* __ARM_PMU_H__ */