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