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 #include "control-internal.h"
  34
  35 static inline bool
  36 trace_event_get_vcpu_state_dynamic_by_vcpu_id(CPUState *vcpu,
  37                                               uint32_t vcpu_id)
  38 {
  39     /* it's on fast path, avoid consistency checks (asserts) */
  40     if (unlikely(trace_events_enabled_count)) {
  41         return test_bit(vcpu_id, vcpu->trace_dstate);
  42     } else {
  43         return false;
  44     }
  45 }
  46
  47 #endif