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authorChristoffer Dall <christoffer.dall@linaro.org>2014-06-09 12:55:13 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2014-09-18 18:44:30 -0700
commitdbf20f9d8105cca531614c8bff9a74351e8e67e7 (patch)
tree1d86e929fa155683d665ba5f8217e54da2845a05 /virt
parent227844f53864077ccaefe01d0960fcccc03445ce (diff)
arm/arm64: KVM: Rename irq_active to irq_queued
We have a special bitmap on the distributor struct to keep track of when level-triggered interrupts are queued on the list registers. This was named irq_active, which is confusing, because the active state of an interrupt as per the GIC spec is a different thing, not specifically related to edge-triggered/level-triggered configurations but rather indicates an interrupt which has been ack'ed but not yet eoi'ed. Rename the bitmap and the corresponding accessor functions to irq_queued to clarify what this is actually used for. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic.c33
1 files changed, 19 insertions, 14 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 7e86a36f3fc5..ce1a2d17ee81 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -60,12 +60,12 @@
* the 'line' again. This is achieved as such:
*
* - When a level interrupt is moved onto a vcpu, the corresponding
- * bit in irq_active is set. As long as this bit is set, the line
+ * bit in irq_queued is set. As long as this bit is set, the line
* will be ignored for further interrupts. The interrupt is injected
* into the vcpu with the GICH_LR_EOI bit set (generate a
* maintenance interrupt on EOI).
* - When the interrupt is EOIed, the maintenance interrupt fires,
- * and clears the corresponding bit in irq_active. This allow the
+ * and clears the corresponding bit in irq_queued. This allows the
* interrupt line to be sampled again.
*/
@@ -196,25 +196,25 @@ static int vgic_irq_is_enabled(struct kvm_vcpu *vcpu, int irq)
return vgic_bitmap_get_irq_val(&dist->irq_enabled, vcpu->vcpu_id, irq);
}
-static int vgic_irq_is_active(struct kvm_vcpu *vcpu, int irq)
+static int vgic_irq_is_queued(struct kvm_vcpu *vcpu, int irq)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- return vgic_bitmap_get_irq_val(&dist->irq_active, vcpu->vcpu_id, irq);
+ return vgic_bitmap_get_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq);
}
-static void vgic_irq_set_active(struct kvm_vcpu *vcpu, int irq)
+static void vgic_irq_set_queued(struct kvm_vcpu *vcpu, int irq)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- vgic_bitmap_set_irq_val(&dist->irq_active, vcpu->vcpu_id, irq, 1);
+ vgic_bitmap_set_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq, 1);
}
-static void vgic_irq_clear_active(struct kvm_vcpu *vcpu, int irq)
+static void vgic_irq_clear_queued(struct kvm_vcpu *vcpu, int irq)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- vgic_bitmap_set_irq_val(&dist->irq_active, vcpu->vcpu_id, irq, 0);
+ vgic_bitmap_set_irq_val(&dist->irq_queued, vcpu->vcpu_id, irq, 0);
}
static int vgic_dist_irq_is_pending(struct kvm_vcpu *vcpu, int irq)
@@ -256,6 +256,11 @@ static void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
vcpu->arch.vgic_cpu.pending_shared);
}
+static bool vgic_can_sample_irq(struct kvm_vcpu *vcpu, int irq)
+{
+ return vgic_irq_is_edge(vcpu, irq) || !vgic_irq_is_queued(vcpu, irq);
+}
+
static u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
{
return le32_to_cpu(*((u32 *)mmio->data)) & mask;
@@ -1079,8 +1084,8 @@ static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
if (!vgic_irq_is_enabled(vcpu, vlr.irq)) {
vgic_retire_lr(lr, vlr.irq, vcpu);
- if (vgic_irq_is_active(vcpu, vlr.irq))
- vgic_irq_clear_active(vcpu, vlr.irq);
+ if (vgic_irq_is_queued(vcpu, vlr.irq))
+ vgic_irq_clear_queued(vcpu, vlr.irq);
}
}
}
@@ -1170,7 +1175,7 @@ static bool vgic_queue_sgi(struct kvm_vcpu *vcpu, int irq)
static bool vgic_queue_hwirq(struct kvm_vcpu *vcpu, int irq)
{
- if (vgic_irq_is_active(vcpu, irq))
+ if (!vgic_can_sample_irq(vcpu, irq))
return true; /* level interrupt, already queued */
if (vgic_queue_irq(vcpu, 0, irq)) {
@@ -1178,7 +1183,7 @@ static bool vgic_queue_hwirq(struct kvm_vcpu *vcpu, int irq)
vgic_dist_irq_clear_pending(vcpu, irq);
vgic_cpu_irq_clear(vcpu, irq);
} else {
- vgic_irq_set_active(vcpu, irq);
+ vgic_irq_set_queued(vcpu, irq);
}
return true;
@@ -1262,7 +1267,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
for_each_set_bit(lr, eisr_ptr, vgic->nr_lr) {
struct vgic_lr vlr = vgic_get_lr(vcpu, lr);
- vgic_irq_clear_active(vcpu, vlr.irq);
+ vgic_irq_clear_queued(vcpu, vlr.irq);
WARN_ON(vlr.state & LR_STATE_MASK);
vlr.state = 0;
vgic_set_lr(vcpu, lr, vlr);
@@ -1429,7 +1434,7 @@ static bool vgic_update_irq_pending(struct kvm *kvm, int cpuid,
goto out;
}
- if (level_triggered && vgic_irq_is_active(vcpu, irq_num)) {
+ if (!vgic_can_sample_irq(vcpu, irq_num)) {
/*
* Level interrupt in progress, will be picked up
* when EOId.

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