The devicetree spec says in section 2.4:

If an interrupt-generating device does not have an interrupt-parent
property, its interrupt parent is assumed to be its devicetree
parent.

Implement this aspect of the spec in the same way as Linux does by not
just looking at the immediate parent but keep on walking up the tree
until we hit a node with an "interrupt-controller" property or a node
that has an "interrupt-parent" property.

similar diff as committed for arm64 a couple of days ago
ok jca@

1 files changed, 14 insertions, 11 deletions

diff --git a/sys/arch/riscv64/riscv64/intr.c b/sys/arch/riscv64/riscv64/intr.c
index b7cb8c5eb2f..a6cd054305e 100644
--- a/sys/arch/riscv64/riscv64/intr.c
+++ b/sys/arch/riscv64/riscv64/intr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: intr.c,v 1.11 2024/06/26 01:40:49 jsg Exp $	*/
+/*	$OpenBSD: intr.c,v 1.12 2024/08/06 09:07:15 kettenis Exp $	*/
 
 /*
  * Copyright (c) 2011 Dale Rahn <drahn@openbsd.org>
@@ -27,7 +27,7 @@
 
 #include <dev/ofw/openfirm.h>
 
-uint32_t riscv_intr_get_parent(int);
+int riscv_intr_get_parent(int);
 uint32_t riscv_intr_map_msi(int, uint64_t *);
 
 void *riscv_intr_prereg_establish_fdt(void *, int *, int, struct cpu_info *,
@@ -74,17 +74,21 @@ riscv_cpu_intr(void *frame)
 /*
  * Find the interrupt parent by walking up the tree.
  */
-uint32_t
+int
 riscv_intr_get_parent(int node)
 {
-	uint32_t phandle = 0;
+	uint32_t phandle;
 
-	while (node && !phandle) {
+	while (node) {
 		phandle = OF_getpropint(node, "interrupt-parent", 0);
+		if (phandle)
+			return OF_getnodebyphandle(phandle);
 		node = OF_parent(node);
+		if (OF_getpropbool(node, "interrupt-controller"))
+			return node;
 	}
 
-	return phandle;
+	return 0;
 }
 
 uint32_t
@@ -271,8 +275,6 @@ riscv_intr_register_fdt(struct interrupt_controller *ic)
 
 	ic->ic_cells = OF_getpropint(ic->ic_node, "#interrupt-cells", 0);
 	ic->ic_phandle = OF_getpropint(ic->ic_node, "phandle", 0);
-	if (ic->ic_phandle == 0)
-		return;
 	KASSERT(ic->ic_cells <= MAX_INTERRUPT_CELLS);
 
 	LIST_INSERT_HEAD(&interrupt_controllers, ic, ic_list);
@@ -323,7 +325,8 @@ riscv_intr_establish_fdt_idx_cpu(int node, int idx, int level,
     struct cpu_info *ci, int (*func)(void *), void *cookie, char *name)
 {
 	struct interrupt_controller *ic;
-	int i, len, ncells, extended = 1;
+	int i, len, ncells, parent;
+	int extended = 1;
 	uint32_t *cell, *cells, phandle;
 	struct machine_intr_handle *ih;
 	void *val = NULL;
@@ -338,9 +341,9 @@ riscv_intr_establish_fdt_idx_cpu(int node, int idx, int level,
 
 	/* Old style. */
 	if (!extended) {
-		phandle = riscv_intr_get_parent(node);
+		parent = riscv_intr_get_parent(node);
 		LIST_FOREACH(ic, &interrupt_controllers, ic_list) {
-			if (ic->ic_phandle == phandle)
+			if (ic->ic_node == parent)
 				break;
 		}