trace/event-internal.h

   1 /*
   2  * Interface for configuring and controlling the state of tracing events.
   3  *
   4  * Copyright (C) 2012-2016 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__EVENT_INTERNAL_H
  11 #define TRACE__EVENT_INTERNAL_H
  12
  13 /*
  14  * Special value for TraceEvent.vcpu_id field to indicate
  15  * that the event is not VCPU specific
  16  */
  17 #define TRACE_VCPU_EVENT_NONE ((uint32_t)-1)
  18
  19 /**
  20  * TraceEvent:
  21  * @id: Unique event identifier.
  22  * @vcpu_id: Unique per-vCPU event identifier.
  23  * @name: Event name.
  24  * @sstate: Static tracing state.
  25  * @dstate: Dynamic tracing state
  26  *
  27  * Interpretation of @dstate depends on whether the event has the 'vcpu'
  28  *  property:
  29  * - false: Boolean value indicating whether the event is active.
  30  * - true : Integral counting the number of vCPUs that have this event enabled.
  31  *
  32  * Opaque generic description of a tracing event.
  33  */
  34 typedef struct TraceEvent {
  35     uint32_t id;
  36     uint32_t vcpu_id;
  37     const char * name;
  38     const bool sstate;
  39     uint16_t *dstate;
  40 } TraceEvent;
  41
  42 void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state);
  43
  44 #endif /* TRACE__EVENT_INTERNAL_H */