LXR qemu/trace/control-vcpu.h

   1/*
   2 * Interface for configuring and controlling the state of tracing events.
   3 *
   4 * Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
   5 *
   6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7 * See the COPYING file in the top-level directory.
   8 */
   9
  10#ifndef TRACE__CONTROL_VCPU_H
  11#define TRACE__CONTROL_VCPU_H
  12
  13#include "control.h"
  14#include "event-internal.h"
  15#include "hw/core/cpu.h"
  16
  17/**
  18 * trace_event_get_vcpu_state:
  19 * @vcpu: Target vCPU.
  20 * @id: Event identifier name.
  21 *
  22 * Get the tracing state of an event (both static and dynamic) for the given
  23 * vCPU.
  24 *
  25 * If the event has the disabled property, the check will have no performance
  26 * impact.
  27 */
  28#define trace_event_get_vcpu_state(vcpu, id)                            \
  29    ((id ##_ENABLED) &&                                                 \
  30     trace_event_get_vcpu_state_dynamic_by_vcpu_id(                     \
  31         vcpu, _ ## id ## _EVENT.vcpu_id))
  32
  33/**
  34 * trace_event_get_vcpu_state_dynamic:
  35 *
  36 * Get the dynamic tracing state of an event for the given vCPU.
  37 */
  38static bool trace_event_get_vcpu_state_dynamic(CPUState *vcpu, TraceEvent *ev);
  39
  40#include "control-internal.h"
  41
  42static inline bool
  43trace_event_get_vcpu_state_dynamic_by_vcpu_id(CPUState *vcpu,
  44                                              uint32_t vcpu_id)
  45{
  46    /* it's on fast path, avoid consistency checks (asserts) */
  47    if (unlikely(trace_events_enabled_count)) {
  48        return test_bit(vcpu_id, vcpu->trace_dstate);
  49    } else {
  50        return false;
  51    }
  52}
  53
  54static inline bool trace_event_get_vcpu_state_dynamic(CPUState *vcpu,
  55                                                      TraceEvent *ev)
  56{
  57    uint32_t vcpu_id;
  58    assert(trace_event_is_vcpu(ev));
  59    vcpu_id = trace_event_get_vcpu_id(ev);
  60    return trace_event_get_vcpu_state_dynamic_by_vcpu_id(vcpu, vcpu_id);
  61}
  62
  63#endif
  64