[S390] lcs: add support for irq statistics

Add support for LCS 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

@@ -22,6 +22,7 @@ enum interruption_class {
 	IOINT_C70,
 	IOINT_TAP,
 	IOINT_VMR,
+	IOINT_LCS,
 	NMI_NMI,
 	NR_IRQS,
 };

arch/s390/kernel/irq.c

@@ -39,6 +39,7 @@ static const struct irq_class intrclass_names[] = {
 	{.name = "C70", .desc = "[I/O] 3270" },
 	{.name = "TAP", .desc = "[I/O] Tape" },
 	{.name = "VMR", .desc = "[I/O] Unit Record Devices" },
+	{.name = "LCS", .desc = "[I/O] LCS" },
 	{.name = "NMI", .desc = "[NMI] Machine Check" },
 };
 

drivers/s390/net/lcs.c

@@ -26,6 +26,7 @@
 #define KMSG_COMPONENT		"lcs"
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
+#include <linux/kernel_stat.h>
 #include <linux/module.h>
 #include <linux/if.h>
 #include <linux/netdevice.h>
@@ -1396,6 +1397,7 @@ lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
 	int rc, index;
 	int cstat, dstat;
 
+	kstat_cpu(smp_processor_id()).irqs[IOINT_LCS]++;
 	if (lcs_check_irb_error(cdev, irb))
 		return;