trace/control-target.c

   1 /*
   2  * Interface for configuring and controlling the state of tracing events.
   3  *
   4  * Copyright (C) 2014-2017 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 #include "qemu/osdep.h"
  11 #include "qemu/lockable.h"
  12 #include "cpu.h"
  13 #include "trace/trace-root.h"
  14 #include "trace/control.h"
  15
  16
  17 void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
  18 {
  19     bool state_pre;
  20     assert(trace_event_get_state_static(ev));
  21     /*
  22      * We ignore the "vcpu" property here, since no vCPUs have been created
  23      * yet. Then dstate can only be 1 or 0.
  24      */
  25     state_pre = *ev->dstate;
  26     if (state_pre != state) {
  27         if (state) {
  28             trace_events_enabled_count++;
  29             *ev->dstate = 1;
  30         } else {
  31             trace_events_enabled_count--;
  32             *ev->dstate = 0;
  33         }
  34     }
  35 }
  36
  37 void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
  38 {
  39     assert(trace_event_get_state_static(ev));
  40
  41     /*
  42      * There is no longer a "vcpu" property, dstate can only be 1 or
  43      * 0. With it, we haven't instantiated any vCPU yet, so we will
  44      * set a global state instead, and trace_init_vcpu will reconcile
  45      * it afterwards.
  46      */
  47     bool state_pre = *ev->dstate;
  48     if (state_pre != state) {
  49         if (state) {
  50             trace_events_enabled_count++;
  51             *ev->dstate = 1;
  52         } else {
  53             trace_events_enabled_count--;
  54             *ev->dstate = 0;
  55         }
  56     }
  57 }