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 * @name: Event name. 23 * @sstate: Static tracing state. 24 * @dstate: Dynamic tracing state 25 * 26 * Interpretation of @dstate depends on whether the event has the 'vcpu' 27 * property: 28 * - false: Boolean value indicating whether the event is active. 29 * - true : Integral counting the number of vCPUs that have this event enabled. 30 * 31 * Opaque generic description of a tracing event. 32 */ 33 typedef struct TraceEvent { 34 uint32_t id; 35 const char * name; 36 const bool sstate; 37 uint16_t *dstate; 38 } TraceEvent; 39 40 void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state); 41 42 #endif /* TRACE__EVENT_INTERNAL_H */ 43