powerpc/xmon: Add a dump of all XIVE interrupts

Modify the xmon 'dxi' command to query all interrupts if no IRQ number
is specified.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190814154754.23682-4-clg@kaod.org

arch/powerpc/xmon/xmon.c

@@ -2584,6 +2584,25 @@ static void dump_one_xive_irq(u32 num)
 		    num, target, prio, lirq, rc);
 }
 
+static void dump_all_xive_irq(void)
+{
+	unsigned int i;
+	struct irq_desc *desc;
+
+	for_each_irq_desc(i, desc) {
+		struct irq_data *d = irq_desc_get_irq_data(desc);
+		unsigned int hwirq;
+
+		if (!d)
+			continue;
+
+		hwirq = (unsigned int)irqd_to_hwirq(d);
+		/* IPIs are special (HW number 0) */
+		if (hwirq)
+			dump_one_xive_irq(hwirq);
+	}
+}
+
 static void dump_xives(void)
 {
 	unsigned long num;
@@ -2601,6 +2620,8 @@ static void dump_xives(void)
 	} else if (c == 'i') {
 		if (scanhex(&num))
 			dump_one_xive_irq(num);
+		else
+			dump_all_xive_irq();
 		return;
 	}