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 } 58