[PATCH] powerpc/opal-irqchip: Use interrupt names if present

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

Recent versions of OPAL will be able to provide names for the various
OPAL interrupts via a new "opal-interrupt-names" property. So let's
use them to make /proc/interrupts more informative.

This also modernises the code that fetches the interrupt array to use
the helpers provided by the generic code instead of hand-parsing the
property.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/platforms/powernv/opal-irqchip.c | 45 ++++++++++++++++++++-------
 1 file changed, 33 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/opal-irqchip.c b/arch/powerpc/platforms/powernv/opal-irqchip.c
index 998316b..fe9b029 100644
--- a/arch/powerpc/platforms/powernv/opal-irqchip.c
+++ b/arch/powerpc/platforms/powernv/opal-irqchip.c
@@ -183,8 +183,9 @@ void opal_event_shutdown(void)
 int __init opal_event_init(void)
 {
 	struct device_node *dn, *opal_node;
-	const __be32 *irqs;
-	int i, irqlen, rc = 0;
+	const char **names;
+	u32 *irqs;
+	int i, rc = 0;
 
 	opal_node = of_find_node_by_path("/ibm,opal");
 	if (!opal_node) {
@@ -209,37 +210,57 @@ int __init opal_event_init(void)
 		goto out;
 	}
 
-	/* Get interrupt property */
-	irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
-	opal_irq_count = irqs ? (irqlen / 4) : 0;
+	/* Get opal-interrupts property and names if present */
+	rc = of_property_count_u32_elems(opal_node, "opal-interrupts");
+	if (rc < 0)
+		goto out;
+	opal_irq_count = rc;
 	pr_debug("Found %d interrupts reserved for OPAL\n", opal_irq_count);
+	irqs = kzalloc(rc * sizeof(u32), GFP_KERNEL);
+	if (WARN_ON(!irqs))
+		goto out;
+	rc = of_property_read_u32_array(opal_node, "opal-interrupts",
+					irqs, opal_irq_count);
+	if (rc < 0) {
+		pr_err("Error %d reading opal-interrupts array\n", rc);
+		goto out;
+	}
+	names = kzalloc(opal_irq_count * sizeof(char *), GFP_KERNEL);
+	of_property_read_string_array(opal_node, "opal-interrupts-names",
+				      names, opal_irq_count);
 
 	/* Install interrupt handlers */
 	opal_irqs = kcalloc(opal_irq_count, sizeof(*opal_irqs), GFP_KERNEL);
-	for (i = 0; irqs && i < opal_irq_count; i++, irqs++) {
-		unsigned int irq, virq;
+	for (i = 0; i < opal_irq_count; i++) {
+		unsigned int virq;
+		char *name;
 
 		/* Get hardware and virtual IRQ */
-		irq = be32_to_cpup(irqs);
-		virq = irq_create_mapping(NULL, irq);
+		virq = irq_create_mapping(NULL, irqs[i]);
 		if (!virq) {
-			pr_warn("Failed to map irq 0x%x\n", irq);
+			pr_warn("Failed to map irq 0x%x\n", irqs[i]);
 			continue;
 		}
+		if (names && names[i] && strlen(names[i]))
+			name = kasprintf(GFP_KERNEL, "opal-%s", names[i]);
+		else
+			name = kasprintf(GFP_KERNEL, "opal");
 
 		/* Install interrupt handler */
 		rc = request_irq(virq, opal_interrupt, IRQF_TRIGGER_LOW,
-				 "opal", NULL);
+				 name, NULL);
 		if (rc) {
 			irq_dispose_mapping(virq);
 			pr_warn("Error %d requesting irq %d (0x%x)\n",
-				 rc, virq, irq);
+				 rc, virq, irqs[i]);
 			continue;
 		}
 
 		/* Cache IRQ */
 		opal_irqs[i] = virq;
 	}
+	kfree(irqs);
+	kfree(names);
 
 out:
 	of_node_put(opal_node);