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-rw-r--r--kernel/irq/irqdesc.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 1487a123db5..a1782f88f0a 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -14,6 +14,7 @@
#include <linux/kernel_stat.h>
#include <linux/radix-tree.h>
#include <linux/bitmap.h>
+#include <linux/irqdomain.h>
#include "internals.h"
@@ -336,6 +337,47 @@ int generic_handle_irq(unsigned int irq)
}
EXPORT_SYMBOL_GPL(generic_handle_irq);
+#ifdef CONFIG_HANDLE_DOMAIN_IRQ
+/**
+ * __handle_domain_irq - 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
+ * @lookup: Whether to perform the domain lookup or not
+ * @regs: Register file coming from the low-level handling code
+ *
+ * Returns: 0 on success, or -EINVAL if conversion has failed
+ */
+int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
+ bool lookup, struct pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+ unsigned int irq = hwirq;
+ int ret = 0;
+
+ irq_enter();
+
+#ifdef CONFIG_IRQ_DOMAIN
+ if (lookup)
+ irq = irq_find_mapping(domain, hwirq);
+#endif
+
+ /*
+ * Some hardware gives randomly wrong interrupts. Rather
+ * than crashing, do something sensible.
+ */
+ if (unlikely(!irq || irq >= nr_irqs)) {
+ ack_bad_irq(irq);
+ ret = -EINVAL;
+ } else {
+ generic_handle_irq(irq);
+ }
+
+ irq_exit();
+ set_irq_regs(old_regs);
+ return ret;
+}
+#endif
+
/* Dynamic interrupt handling */
/**