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  */
  38 static bool trace_event_get_vcpu_state_dynamic(CPUState *vcpu, TraceEvent *ev);
  39
  40 #include "control-internal.h"
  41
  42 static inline bool
  43 trace_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
  54 static 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