irqchip/xtensa-mx: Fix initial IRQ affinity in non-SMP setup

When irq-xtensa-mx chip is used in non-SMP configuration its
irq_set_affinity callback is not called leaving IRQ affinity set empty.
As a result IRQ delivery does not work in that configuration.
Initialize IRQ affinity of the xtensa MX interrupt distributor to CPU 0
for all external IRQ lines.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220426161912.1113784-1-jcmvbkbc@gmail.com

diff --git a/drivers/irqchip/irq-xtensa-mx.c b/drivers/irqchip/irq-xtensa-mx.c
index 27933338f7b363d8d0061b86acbe260e688a4ce6..8c581c985aa7ddb0e9c96008807fb945eb1361ea 100644 (file)
--- a/drivers/irqchip/irq-xtensa-mx.c
+++ b/drivers/irqchip/irq-xtensa-mx.c
@@ -151,14 +151,25 @@ static struct irq_chip xtensa_mx_irq_chip = {
        .irq_set_affinity = xtensa_mx_irq_set_affinity,
 };
 
+static void __init xtensa_mx_init_common(struct irq_domain *root_domain)
+{
+       unsigned int i;
+
+       irq_set_default_host(root_domain);
+       secondary_init_irq();
+
+       /* Initialize default IRQ routing to CPU 0 */
+       for (i = 0; i < XCHAL_NUM_EXTINTERRUPTS; ++i)
+               set_er(1, MIROUT(i));
+}
+
 int __init xtensa_mx_init_legacy(struct device_node *interrupt_parent)
 {
        struct irq_domain *root_domain =
                irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0,
                                &xtensa_mx_irq_domain_ops,
                                &xtensa_mx_irq_chip);
-       irq_set_default_host(root_domain);
-       secondary_init_irq();
+       xtensa_mx_init_common(root_domain);
        return 0;
 }
 
@@ -168,8 +179,7 @@ static int __init xtensa_mx_init(struct device_node *np,
        struct irq_domain *root_domain =
                irq_domain_add_linear(np, NR_IRQS, &xtensa_mx_irq_domain_ops,
                                &xtensa_mx_irq_chip);
-       irq_set_default_host(root_domain);
-       secondary_init_irq();
+       xtensa_mx_init_common(root_domain);
        return 0;
 }
 IRQCHIP_DECLARE(xtensa_mx_irq_chip, "cdns,xtensa-mx", xtensa_mx_init);