hpsim, initialize chip for assigned irqs

Currently, when assign_irq_vector is called and the irq connected in
the simulator, the irq is not ready. request_irq will return ENOSYS
immediately. It is because the irq chip is unset.

Hence set the chip properly to irq_type_hp_sim. And make sure this is
done from both users of simulated interrupts.

Also we have to set handler here, otherwise we end up in
handle_bad_int resulting in spam in logs and no irqs handled. We use
handle_simple_irq as these are SW interrupts that need no ACK or
anything.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 30 insertions, 6 deletions

diff --git a/arch/ia64/hp/sim/hpsim_irq.c b/arch/ia64/hp/sim/hpsim_irq.c
index 4bd9a63..0aa70eb 100644
--- a/arch/ia64/hp/sim/hpsim_irq.c
+++ b/arch/ia64/hp/sim/hpsim_irq.c
@@ -10,6 +10,8 @@
 #include <linux/sched.h>
 #include <linux/irq.h>
 
+#include "hpsim_ssc.h"
+
 static unsigned int
 hpsim_irq_startup(struct irq_data *data)
 {
@@ -37,15 +39,37 @@ static struct irq_chip irq_type_hp_sim = {
 	.irq_set_affinity =	hpsim_set_affinity_noop,
 };
 
+static void hpsim_irq_set_chip(int irq)
+{
+	struct irq_chip *chip = irq_get_chip(irq);
+
+	if (chip == &no_irq_chip)
+		irq_set_chip(irq, &irq_type_hp_sim);
+}
+
+static void hpsim_connect_irq(int intr, int irq)
+{
+	ia64_ssc(intr, irq, 0, 0, SSC_CONNECT_INTERRUPT);
+}
+
+int hpsim_get_irq(int intr)
+{
+	int irq = assign_irq_vector(AUTO_ASSIGN);
+
+	if (irq >= 0) {
+		hpsim_irq_set_chip(irq);
+		irq_set_handler(irq, handle_simple_irq);
+		hpsim_connect_irq(intr, irq);
+	}
+
+	return irq;
+}
+
 void __init
 hpsim_irq_init (void)
 {
 	int i;
 
-	for_each_active_irq(i) {
-		struct irq_chip *chip = irq_get_chip(i);
-
-		if (chip == &no_irq_chip)
-			irq_set_chip(i, &irq_type_hp_sim);
-	}
+	for_each_active_irq(i)
+		hpsim_irq_set_chip(i);
 }