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
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 *
 * Authors: Andreas Sandberg
 */

#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