From: Liao Chang liaochang1@huawei.com
mainline inclusion from mainline-5.10 commit 5f774f5e12512b850a611aa99b4601d7eac50edb category: bugfix bugzilla: NA CVE: NA
-------------------------------------------------
It is pretty easy to provide a retrigger callback for the ITS, as it we already have the required support in terms of irq_set_irqchip_state().
Note that this only works for device-generated LPIs, and not the GICv4 doorbells, which should never have to be retriggered anyway.
Reviewed-by: Valentin Schneider valentin.schneider@arm.com Signed-off-by: Marc Zyngier maz@kernel.org Signed-off-by: Liao Chang liaochang1@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/irqchip/irq-gic-v3-its.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 03b720aaa0546..489e2e85ce3a3 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1467,6 +1467,11 @@ static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info) } }
+static int its_irq_retrigger(struct irq_data *d) +{ + return !its_irq_set_irqchip_state(d, IRQCHIP_STATE_PENDING, true); +} + static struct irq_chip its_irq_chip = { .name = "ITS", .irq_mask = its_mask_irq, @@ -1475,6 +1480,7 @@ static struct irq_chip its_irq_chip = { .irq_set_affinity = its_set_affinity, .irq_compose_msi_msg = its_irq_compose_msi_msg, .irq_set_irqchip_state = its_irq_set_irqchip_state, + .irq_retrigger = its_irq_retrigger, .irq_set_vcpu_affinity = its_irq_set_vcpu_affinity, };