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authorMarc Zyngier <marc.zyngier@arm.com>2015-08-26 17:00:45 +0100
committerThomas Gleixner <tglx@linutronix.de>2015-08-27 17:13:49 +0200
commit01f779f4862b53810ba4eb247f57bd1ad31d1c18 (patch)
tree1561ec18dd58389bba56ab8cd38f1d34e477fa84 /drivers/irqchip
parent0b996fd35957a30568cddbce05b917c1897966e0 (diff)
downloadop-kernel-dev-01f779f4862b53810ba4eb247f57bd1ad31d1c18.zip
op-kernel-dev-01f779f4862b53810ba4eb247f57bd1ad31d1c18.tar.gz
irqchip/GIC: Don't deactivate interrupts forwarded to a guest
Commit 0a4377de3056 ("genirq: Introduce irq_set_vcpu_affinity() to target an interrupt to a VCPU") added just what we needed at the lowest level to allow an interrupt to be deactivated by a guest. When such a request reaches the GIC, it knows it doesn't need to perform the deactivation anymore, and can safely leave the guest do its magic. This of course requires additional support in both VFIO and KVM. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-and-tested-by: Eric Auger <eric.auger@linaro.org> Cc: Christoffer Dall <christoffer.dall@linaro.org> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: <linux-arm-kernel@lists.infradead.org> Cc: kvmarm@lists.cs.columbia.edu Cc: Jason Cooper <jason@lakedaemon.net> Link: http://lkml.kernel.org/r/1440604845-28229-5-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-gic.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index c835f4c..72bf81b 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -140,6 +140,36 @@ static inline unsigned int gic_irq(struct irq_data *d)
return d->hwirq;
}
+static inline bool cascading_gic_irq(struct irq_data *d)
+{
+ void *data = irq_data_get_irq_handler_data(d);
+
+ /*
+ * If handler_data pointing to one of the secondary GICs, then
+ * this is a cascading interrupt, and it cannot possibly be
+ * forwarded.
+ */
+ if (data >= (void *)(gic_data + 1) &&
+ data < (void *)(gic_data + MAX_GIC_NR))
+ return true;
+
+ return false;
+}
+
+static inline bool forwarded_irq(struct irq_data *d)
+{
+ /*
+ * A forwarded interrupt:
+ * - is on the primary GIC
+ * - has its handler_data set to a value
+ * - that isn't a secondary GIC
+ */
+ if (d->handler_data && !cascading_gic_irq(d))
+ return true;
+
+ return false;
+}
+
/*
* Routines to acknowledge, disable and enable interrupts
*/
@@ -163,6 +193,16 @@ static void gic_mask_irq(struct irq_data *d)
static void gic_eoimode1_mask_irq(struct irq_data *d)
{
gic_mask_irq(d);
+ /*
+ * When masking a forwarded interrupt, make sure it is
+ * deactivated as well.
+ *
+ * This ensures that an interrupt that is getting
+ * disabled/masked will not get "stuck", because there is
+ * noone to deactivate it (guest is being terminated).
+ */
+ if (forwarded_irq(d))
+ gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR);
}
static void gic_unmask_irq(struct irq_data *d)
@@ -177,6 +217,10 @@ static void gic_eoi_irq(struct irq_data *d)
static void gic_eoimode1_eoi_irq(struct irq_data *d)
{
+ /* Do not deactivate an IRQ forwarded to a vcpu. */
+ if (forwarded_irq(d))
+ return;
+
writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
}
@@ -246,6 +290,16 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
return gic_configure_irq(gicirq, type, base, NULL);
}
+static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
+{
+ /* Only interrupts on the primary GIC can be forwarded to a vcpu. */
+ if (cascading_gic_irq(d))
+ return -EINVAL;
+
+ d->handler_data = vcpu;
+ return 0;
+}
+
#ifdef CONFIG_SMP
static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
bool force)
@@ -357,6 +411,7 @@ static struct irq_chip gic_eoimode1_chip = {
#endif
.irq_get_irqchip_state = gic_irq_get_irqchip_state,
.irq_set_irqchip_state = gic_irq_set_irqchip_state,
+ .irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity,
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
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