[S390] claw: add support for irq statistics

Add support for CLAW 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

@@ -23,6 +23,7 @@ enum interruption_class {
 	IOINT_TAP,
 	IOINT_VMR,
 	IOINT_LCS,
+	IOINT_CLW,
 	NMI_NMI,
 	NR_IRQS,
 };

arch/s390/kernel/irq.c

@@ -40,6 +40,7 @@ static const struct irq_class intrclass_names[] = {
 	{.name = "TAP", .desc = "[I/O] Tape" },
 	{.name = "VMR", .desc = "[I/O] Unit Record Devices" },
 	{.name = "LCS", .desc = "[I/O] LCS" },
+	{.name = "CLW", .desc = "[I/O] CLAW" },
 	{.name = "NMI", .desc = "[NMI] Machine Check" },
 };
 

drivers/s390/net/claw.c

@@ -63,6 +63,7 @@
 
 #define KMSG_COMPONENT "claw"
 
+#include <linux/kernel_stat.h>
 #include <asm/ccwdev.h>
 #include <asm/ccwgroup.h>
 #include <asm/debug.h>
@@ -640,6 +641,7 @@ claw_irq_handler(struct ccw_device *cdev,
         struct claw_env  *p_env;
         struct chbk *p_ch_r=NULL;
 
+	kstat_cpu(smp_processor_id()).irqs[IOINT_CLW]++;
 	CLAW_DBF_TEXT(4, trace, "clawirq");
         /* Bypass all 'unsolicited interrupts' */
 	privptr = dev_get_drvdata(&cdev->dev);