2 * Interface for configuring and controlling the state of tracing events.
4 * Copyright (C) 2014-2017 LluĂs Vilanova <vilanova@ac.upc.edu>
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.
10 #include "qemu/osdep.h"
12 #include "trace-root.h"
13 #include "trace/control.h"
14 #include "translate-all.h"
17 void trace_event_set_state_dynamic_init(TraceEvent
*ev
, bool state
)
20 assert(trace_event_get_state_static(ev
));
22 * We ignore the "vcpu" property here, since no vCPUs have been created
23 * yet. Then dstate can only be 1 or 0.
25 state_pre
= *ev
->dstate
;
26 if (state_pre
!= state
) {
28 trace_events_enabled_count
++;
31 trace_events_enabled_count
--;
37 void trace_event_set_state_dynamic(TraceEvent
*ev
, bool state
)
40 assert(trace_event_get_state_static(ev
));
41 if (trace_event_is_vcpu(ev
) && likely(first_cpu
!= NULL
)) {
43 trace_event_set_vcpu_state_dynamic(vcpu
, ev
, state
);
47 * Without the "vcpu" property, dstate can only be 1 or 0. With it, we
48 * haven't instantiated any vCPU yet, so we will set a global state
49 * instead, and trace_init_vcpu will reconcile it afterwards.
51 bool state_pre
= *ev
->dstate
;
52 if (state_pre
!= state
) {
54 trace_events_enabled_count
++;
57 trace_events_enabled_count
--;
64 static void trace_event_synchronize_vcpu_state_dynamic(
65 CPUState
*vcpu
, run_on_cpu_data ignored
)
67 bitmap_copy(vcpu
->trace_dstate
, vcpu
->trace_dstate_delayed
,
68 CPU_TRACE_DSTATE_MAX_EVENTS
);
69 cpu_tb_jmp_cache_clear(vcpu
);
72 void trace_event_set_vcpu_state_dynamic(CPUState
*vcpu
,
73 TraceEvent
*ev
, bool state
)
77 assert(trace_event_get_state_static(ev
));
78 assert(trace_event_is_vcpu(ev
));
79 vcpu_id
= trace_event_get_vcpu_id(ev
);
80 state_pre
= test_bit(vcpu_id
, vcpu
->trace_dstate
);
81 if (state_pre
!= state
) {
83 trace_events_enabled_count
++;
84 set_bit(vcpu_id
, vcpu
->trace_dstate_delayed
);
87 trace_events_enabled_count
--;
88 clear_bit(vcpu_id
, vcpu
->trace_dstate_delayed
);
92 * Delay changes until next TB; we want all TBs to be built from a
93 * single set of dstate values to ensure consistency of generated
96 async_run_on_cpu(vcpu
, trace_event_synchronize_vcpu_state_dynamic
,
101 static bool adding_first_cpu1(void)
114 static bool adding_first_cpu(void)
118 res
= adding_first_cpu1();
123 void trace_init_vcpu(CPUState
*vcpu
)
127 trace_event_iter_init(&iter
, NULL
);
128 while ((ev
= trace_event_iter_next(&iter
)) != NULL
) {
129 if (trace_event_is_vcpu(ev
) &&
130 trace_event_get_state_static(ev
) &&
131 trace_event_get_state_dynamic(ev
)) {
132 if (adding_first_cpu()) {
133 /* check preconditions */
134 assert(*ev
->dstate
== 1);
135 /* disable early-init state ... */
137 trace_events_enabled_count
--;
138 /* ... and properly re-enable */
139 trace_event_set_vcpu_state_dynamic(vcpu
, ev
, true);
141 trace_event_set_vcpu_state_dynamic(vcpu
, ev
, true);
145 trace_guest_cpu_enter(vcpu
);