Merge tag 'irqchip-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core

Pull irqchip updates from Marc Zyngier

- Core pseudo-NMI handling code
- Allow the default irq domain to be retrieved
- A new interrupt controller for the Loongson LS1X platform
- Affinity support for the SiFive PLIC
- Better support for the iMX irqsteer driver
- NUMA aware memory allocations for GICv3
- A handful of other fixes (i8259, GICv3, PLIC)

1 files changed, 35 insertions, 0 deletions

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 84fa255d0329..13539e12cd80 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -670,6 +670,41 @@ int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
         set_irq_regs(old_regs);
         return ret;
 }
+
+#ifdef CONFIG_IRQ_DOMAIN
+/**
+ * handle_domain_nmi - Invoke the handler for a HW irq belonging to a domain
+ * @domain:     The domain where to perform the lookup
+ * @hwirq:      The HW irq number to convert to a logical one
+ * @regs:       Register file coming from the low-level handling code
+ *
+ * Returns:     0 on success, or -EINVAL if conversion has failed
+ */
+int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
+                      struct pt_regs *regs)
+{
+        struct pt_regs *old_regs = set_irq_regs(regs);
+        unsigned int irq;
+        int ret = 0;
+
+        nmi_enter();
+
+        irq = irq_find_mapping(domain, hwirq);
+
+        /*
+         * ack_bad_irq is not NMI-safe, just report
+         * an invalid interrupt.
+         */
+        if (likely(irq))
+                generic_handle_irq(irq);
+        else
+                ret = -EINVAL;
+
+        nmi_exit();
+        set_irq_regs(old_regs);
+        return ret;
+}
+#endif
 #endif
 
 /* Dynamic interrupt handling */