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authorChristoffer Dall <christoffer.dall@linaro.org>2015-08-30 13:57:20 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2015-10-22 23:01:48 +0200
commite21f09108754dfdfbb30e547f4edbd3b6884eedb (patch)
tree48d8d7f3f1f98da55be92d1610562d7b313befb0 /virt
parentb5905dc12ed4254f7e0aac62bab48f002181f639 (diff)
downloadlinux-linaro-stable-e21f09108754dfdfbb30e547f4edbd3b6884eedb.tar.gz
arm/arm64: KVM: Add tracepoints for vgic and timer
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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/arch_timer.c4
-rw-r--r--virt/kvm/arm/trace.h63
-rw-r--r--virt/kvm/arm/vgic.c5
3 files changed, 72 insertions, 0 deletions
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 523816d8c402..21a0ab2d8919 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -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);
diff --git a/virt/kvm/arm/trace.h b/virt/kvm/arm/trace.h
new file mode 100644
index 000000000000..37d8b98867d5
--- /dev/null
+++ b/virt/kvm/arm/trace.h
@@ -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>
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 84abc6f38c1d..d4669eb29b77 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -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;