[tip: irq/core] irqchip/git-v3-its: Implement irq_retrigger callback for device-triggered LPIs

[tip-bot2 for Marc Zyngier]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     5f774f5e12512b850a611aa99b4601d7eac50edb
Gitweb:        https://git.kernel.org/tip/5f774f5e12512b850a611aa99b4601d7eac50edb
Author:        Marc Zyngier <maz@xxxxxxxxxx>
AuthorDate:    Fri, 31 Jul 2020 11:33:13 +01:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Sun, 06 Sep 2020 18:26:13 +01:00

irqchip/git-v3-its: Implement irq_retrigger callback for device-triggered LPIs

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@xxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
 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 95f0974..2808545 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1720,6 +1720,11 @@ static int its_irq_set_irqchip_state(struct irq_data *d,
 	return 0;
 }
 
+static int its_irq_retrigger(struct irq_data *d)
+{
+	return !its_irq_set_irqchip_state(d, IRQCHIP_STATE_PENDING, true);
+}
+
 /*
  * Two favourable cases:
  *
@@ -1971,6 +1976,7 @@ 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,
 };