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arm/arm64: KVM: Add tracepoints for vgic and timer

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The VGIC and timer code for KVM arm/arm64 doesn't have any tracepoints
or tracepoint infrastructure defined.  Rewriting some of the timer code
handling showed me how much we need this, so let's add these simple
trace points once and for all and we can easily expand with additional
trace points in these files as we go along.

Cc: Wei Huang <wei@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Christoffer Dall 2015-08-30 13:57:20 +02:00
parent b5905dc12e
commit e21f091087
3 changed files with 72 additions and 0 deletions
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4
virt/kvm/arm/arch_timer.c
View File

@ -28,6 +28,8 @@
#include <kvm/arm_vgic.h>
#include <kvm/arm_arch_timer.h>
#include "trace.h"
static struct timecounter *timecounter;
static struct workqueue_struct *wqueue;
static unsigned int host_vtimer_irq;
@ -129,6 +131,8 @@ static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level)
BUG_ON(!vgic_initialized(vcpu->kvm));
timer->irq.level = new_level;
trace_kvm_timer_update_irq(vcpu->vcpu_id, timer->map->virt_irq,
timer->irq.level);
ret = kvm_vgic_inject_mapped_irq(vcpu->kvm, vcpu->vcpu_id,
timer->map,
timer->irq.level);

63
virt/kvm/arm/trace.h Normal file
View File

@ -0,0 +1,63 @@
#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_KVM_H
#include <linux/tracepoint.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kvm
/*
* Tracepoints for vgic
*/
TRACE_EVENT(vgic_update_irq_pending,
TP_PROTO(unsigned long vcpu_id, __u32 irq, bool level),
TP_ARGS(vcpu_id, irq, level),
TP_STRUCT__entry(
__field( unsigned long, vcpu_id )
__field( __u32, irq )
__field( bool, level )
),
TP_fast_assign(
__entry->vcpu_id = vcpu_id;
__entry->irq = irq;
__entry->level = level;
),
TP_printk("VCPU: %ld, IRQ %d, level: %d",
__entry->vcpu_id, __entry->irq, __entry->level)
);
/*
* Tracepoints for arch_timer
*/
TRACE_EVENT(kvm_timer_update_irq,
TP_PROTO(unsigned long vcpu_id, __u32 irq, int level),
TP_ARGS(vcpu_id, irq, level),
TP_STRUCT__entry(
__field( unsigned long, vcpu_id )
__field( __u32, irq )
__field( int, level )
),
TP_fast_assign(
__entry->vcpu_id = vcpu_id;
__entry->irq = irq;
__entry->level = level;
),
TP_printk("VCPU: %ld, IRQ %d, level %d",
__entry->vcpu_id, __entry->irq, __entry->level)
);
#endif /* _TRACE_KVM_H */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH ../../../virt/kvm/arm
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE trace
/* This part must be outside protection */
#include <trace/define_trace.h>

5
virt/kvm/arm/vgic.c
View File

@ -34,6 +34,9 @@
#include <asm/kvm.h>
#include <kvm/iodev.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
/*
* How the whole thing works (courtesy of Christoffer Dall):
*
@ -1574,6 +1577,8 @@ static int vgic_update_irq_pending(struct kvm *kvm, int cpuid,
int enabled;
bool ret = true, can_inject = true;
trace_vgic_update_irq_pending(cpuid, irq_num, level);
if (irq_num >= min(kvm->arch.vgic.nr_irqs, 1020))
return -EINVAL;