[S390] ctc: add support for irq statistics

Add support for CTC 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

@@ -24,6 +24,7 @@ enum interruption_class {
 	IOINT_VMR,
 	IOINT_LCS,
 	IOINT_CLW,
+	IOINT_CTC,
 	NMI_NMI,
 	NR_IRQS,
 };

arch/s390/kernel/irq.c

@@ -41,6 +41,7 @@ static const struct irq_class intrclass_names[] = {
 	{.name = "VMR", .desc = "[I/O] Unit Record Devices" },
 	{.name = "LCS", .desc = "[I/O] LCS" },
 	{.name = "CLW", .desc = "[I/O] CLAW" },
+	{.name = "CTC", .desc = "[I/O] CTC" },
 	{.name = "NMI", .desc = "[NMI] Machine Check" },
 };
 

drivers/s390/net/ctcm_main.c

@@ -24,6 +24,7 @@
 #define KMSG_COMPONENT "ctcm"
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
+#include <linux/kernel_stat.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -1204,6 +1205,7 @@ static void ctcm_irq_handler(struct ccw_device *cdev,
 	int cstat;
 	int dstat;
 
+	kstat_cpu(smp_processor_id()).irqs[IOINT_CTC]++;
 	CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 		"Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));