arch/arm64/include/asm/pmu.h

   1 /*
   2  * Based on arch/arm/include/asm/pmu.h
   3  *
   4  * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
   5  * Copyright (C) 2012 ARM Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #ifndef __ASM_PMU_H
  20 #define __ASM_PMU_H
  21
  22 #ifdef CONFIG_HW_PERF_EVENTS
  23
  24 /* The events for a given PMU register set. */
  25 struct pmu_hw_events {
  26         /*
  27          * The events that are active on the PMU for the given index.
  28          */
  29         struct perf_event       **events;
  30
  31         /*
  32          * A 1 bit for an index indicates that the counter is being used for
  33          * an event. A 0 means that the counter can be used.
  34          */
  35         unsigned long           *used_mask;
  36
  37         /*
  38          * Hardware lock to serialize accesses to PMU registers. Needed for the
  39          * read/modify/write sequences.
  40          */
  41         raw_spinlock_t          pmu_lock;
  42 };
  43
  44 struct arm_pmu {
  45         struct pmu              pmu;
  46         cpumask_t               active_irqs;
  47         const char              *name;
  48         irqreturn_t             (*handle_irq)(int irq_num, void *dev);
  49         void                    (*enable)(struct hw_perf_event *evt, int idx);
  50         void                    (*disable)(struct hw_perf_event *evt, int idx);
  51         int                     (*get_event_idx)(struct pmu_hw_events *hw_events,
  52                                                  struct hw_perf_event *hwc);
  53         int                     (*set_event_filter)(struct hw_perf_event *evt,
  54                                                     struct perf_event_attr *attr);
  55         u32                     (*read_counter)(int idx);
  56         void                    (*write_counter)(int idx, u32 val);
  57         void                    (*start)(void);
  58         void                    (*stop)(void);
  59         void                    (*reset)(void *);
  60         int                     (*map_event)(struct perf_event *event);
  61         int                     num_events;
  62         atomic_t                active_events;
  63         struct mutex            reserve_mutex;
  64         u64                     max_period;
  65         struct platform_device  *plat_device;
  66         struct pmu_hw_events    *(*get_hw_events)(void);
  67 };
  68
  69 #define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
  70
  71 int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type);
  72
  73 u64 armpmu_event_update(struct perf_event *event,
  74                         struct hw_perf_event *hwc,
  75                         int idx);
  76
  77 int armpmu_event_set_period(struct perf_event *event,
  78                             struct hw_perf_event *hwc,
  79                             int idx);
  80
  81 #endif /* CONFIG_HW_PERF_EVENTS */
  82 #endif /* __ASM_PMU_H */