[S390] 3270: add support for irq statistics

Add support for 3270 I/O interrupt statistics in /proc/interrupts.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/irq.h

@@ -19,6 +19,7 @@ enum interruption_class {
 	IOINT_QDI,
 	IOINT_DAS,
 	IOINT_C15,
+	IOINT_C70,
 	NMI_NMI,
 	NR_IRQS,
 };

arch/s390/kernel/irq.c

@@ -36,6 +36,7 @@ static const struct irq_class intrclass_names[] = {
 	{.name = "QDI", .desc = "[I/O] QDIO Interrupt" },
 	{.name = "DAS", .desc = "[I/O] DASD" },
 	{.name = "C15", .desc = "[I/O] 3215" },
+	{.name = "C70", .desc = "[I/O] 3270" },
 	{.name = "NMI", .desc = "[NMI] Machine Check" },
 };
 

drivers/s390/char/raw3270.c

@@ -7,6 +7,7 @@
  *     Copyright IBM Corp. 2003, 2009
  */
 
+#include <linux/kernel_stat.h>
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/init.h>
@@ -329,6 +330,7 @@ raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
 	struct raw3270_request *rq;
 	int rc;
 
+	kstat_cpu(smp_processor_id()).irqs[IOINT_C70]++;
 	rp = dev_get_drvdata(&cdev->dev);
 	if (!rp)
 		return;