perfevent.hh

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/*
 * Copyright (c) 2012 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
 *
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 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
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 * redistributions in binary form must reproduce the above copyright
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#ifndef __CPU_KVM_PERFEVENT_HH__
#define __CPU_KVM_PERFEVENT_HH__
 
#include <linux/perf_event.h>
#include <sys/types.h>
 
#include <inttypes.h>
 
#include "config/have_perf_attr_exclude_host.hh"
 
class PerfKvmCounterConfig
{
  public:
    PerfKvmCounterConfig(uint32_t type, uint64_t config);
    ~PerfKvmCounterConfig();
 
    PerfKvmCounterConfig &samplePeriod(uint64_t period) {
        attr.freq = 0;
        attr.sample_period = period;
        return *this;
    }
 
    PerfKvmCounterConfig &wakeupEvents(uint32_t events) {
        attr.watermark = 0;
        attr.wakeup_events = events;
        return *this;
    }
 
    PerfKvmCounterConfig &disabled(bool val) {
        attr.disabled = val;
        return *this;
    }
 
    PerfKvmCounterConfig &pinned(bool val) {
        attr.pinned = val;
        return *this;
    }
 
    PerfKvmCounterConfig &exclude_host(bool val) {
#if HAVE_PERF_ATTR_EXCLUDE_HOST == 1
        attr.exclude_host = val;
#endif
        return *this;
    }
 
    PerfKvmCounterConfig &exclude_hv(bool val) {
        attr.exclude_hv = val;
        return *this;
    }
 
    struct perf_event_attr attr;
};
 
class PerfKvmCounter
{
public:
    PerfKvmCounter(PerfKvmCounterConfig &config, pid_t tid);
    PerfKvmCounter(PerfKvmCounterConfig &config,
                pid_t tid, const PerfKvmCounter &parent);
    PerfKvmCounter();
    ~PerfKvmCounter();
 
 
    void attach(PerfKvmCounterConfig &config, pid_t tid) {
        attach(config, tid, -1);
    }
 
    void attach(PerfKvmCounterConfig &config,
                pid_t tid, const PerfKvmCounter &parent) {
        attach(config, tid, parent.fd);
    }
 
    void detach();
 
    bool attached() const { return fd != -1; }
 
    void start();
 
    void stop();
 
    void period(uint64_t period);
 
    void refresh(int refresh);
 
    uint64_t read() const;
 
    void enableSignals(pid_t tid, int signal);
 
    void enableSignals(int signal) { enableSignals(sysGettid(), signal); }
 
private:
    // Disallow copying
    PerfKvmCounter(const PerfKvmCounter &that);
    // Disallow assignment
    PerfKvmCounter &operator=(const PerfKvmCounter &that);
 
    void attach(PerfKvmCounterConfig &config, pid_t tid, int group_fd);
 
    pid_t sysGettid();
 
    void mmapPerf(int pages);
 
    int fcntl(int cmd, long p1);
    int fcntl(int cmd, void *p1) { return fcntl(cmd, (long)p1); }
    int ioctl(int request, long p1);
    int ioctl(int request, void *p1) { return ioctl(request, (long)p1); }
    int ioctl(int request) { return ioctl(request, 0L); }
    void read(void *buf, size_t size) const;
 
    int fd;
 
    struct perf_event_mmap_page *ringBuffer;
    int ringNumPages;
 
    long pageSize;
};
 
#endif