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The TraceEventID and TraceEventVCPUID enums constants are no longer actually used for anything critical. The TRACE_EVENT_COUNT limit is used to determine the size of the TraceEvents array, and can be removed if we just NULL terminate the array instead. The TRACE_VCPU_EVENT_COUNT limit is used as a magic value for marking non-vCPU events, and also for declaring the size of the trace dstate mask in the CPUState struct. The former usage can be replaced by a dedicated constant TRACE_EVENT_VCPU_NONE, defined as (uint32_t)-1. For the latter usage, we can simply define a constant for the number of VCPUs, avoiding the need for the full enum. The only other usages of the enum values can be replaced by accesing the id/vcpu_id fields via the named TraceEvent structs. Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 1475588159-30598-11-git-send-email-berrange@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/*
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* Interface for configuring and controlling the state of tracing events.
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*
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* Copyright (C) 2014-2016 Lluís Vilanova <vilanova@ac.upc.edu>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "trace.h"
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#include "trace/control.h"
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#include "translate-all.h"
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void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
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{
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bool state_pre;
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assert(trace_event_get_state_static(ev));
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/*
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* We ignore the "vcpu" property here, since no vCPUs have been created
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* yet. Then dstate can only be 1 or 0.
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*/
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state_pre = *ev->dstate;
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if (state_pre != state) {
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if (state) {
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trace_events_enabled_count++;
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*ev->dstate = 1;
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} else {
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trace_events_enabled_count--;
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*ev->dstate = 0;
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}
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}
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}
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void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
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{
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CPUState *vcpu;
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assert(trace_event_get_state_static(ev));
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if (trace_event_is_vcpu(ev)) {
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CPU_FOREACH(vcpu) {
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trace_event_set_vcpu_state_dynamic(vcpu, ev, state);
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}
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} else {
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/* Without the "vcpu" property, dstate can only be 1 or 0 */
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bool state_pre = *ev->dstate;
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if (state_pre != state) {
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if (state) {
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trace_events_enabled_count++;
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*ev->dstate = 1;
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} else {
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trace_events_enabled_count--;
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*ev->dstate = 0;
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}
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}
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}
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}
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void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
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TraceEvent *ev, bool state)
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{
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uint32_t vcpu_id;
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bool state_pre;
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assert(trace_event_get_state_static(ev));
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assert(trace_event_is_vcpu(ev));
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vcpu_id = trace_event_get_vcpu_id(ev);
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state_pre = test_bit(vcpu_id, vcpu->trace_dstate);
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if (state_pre != state) {
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if (state) {
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trace_events_enabled_count++;
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set_bit(vcpu_id, vcpu->trace_dstate);
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(*ev->dstate)++;
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} else {
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trace_events_enabled_count--;
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clear_bit(vcpu_id, vcpu->trace_dstate);
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(*ev->dstate)--;
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}
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}
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}
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static bool adding_first_cpu(void)
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{
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CPUState *cpu;
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size_t count = 0;
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CPU_FOREACH(cpu) {
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count++;
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if (count > 1) {
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return false;
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}
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}
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return true;
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}
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void trace_init_vcpu(CPUState *vcpu)
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{
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TraceEventIter iter;
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TraceEvent *ev;
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trace_event_iter_init(&iter, NULL);
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while ((ev = trace_event_iter_next(&iter)) != NULL) {
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if (trace_event_is_vcpu(ev) &&
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trace_event_get_state_static(ev) &&
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trace_event_get_state_dynamic(ev)) {
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if (adding_first_cpu()) {
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/* check preconditions */
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assert(*ev->dstate == 1);
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/* disable early-init state ... */
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*ev->dstate = 0;
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trace_events_enabled_count--;
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/* ... and properly re-enable */
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trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
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} else {
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trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
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}
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}
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}
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trace_guest_cpu_enter(vcpu);
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}
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