Commit b8665172 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[S390] tape: add support for irq statistics 



Add support for ccw based tape I/O interrupt statistics in /proc/interrupts.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 3fe22f6b

arch/s390/include/asm/irq.h

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ enum interruption_class { 
	IOINT_DAS,

	IOINT_C15,

	IOINT_C70,

	IOINT_TAP,

	NMI_NMI,

	NR_IRQS,

};

arch/s390/kernel/irq.c

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ static const struct irq_class intrclass_names[] = { 
	{.name = "DAS", .desc = "[I/O] DASD" },

	{.name = "C15", .desc = "[I/O] 3215" },

	{.name = "C70", .desc = "[I/O] 3270" },

	{.name = "TAP", .desc = "[I/O] Tape" },

	{.name = "NMI", .desc = "[NMI] Machine Check" },

};

drivers/s390/char/tape_core.c

+2 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#define KMSG_COMPONENT "tape"

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt



#include <linux/kernel_stat.h>

#include <linux/module.h>

#include <linux/init.h>	     // for kernel parameters

#include <linux/kmod.h>	     // for requesting modules
@@ -1114,6 +1115,7 @@ __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 
	struct tape_request *request;

	int rc;



	kstat_cpu(smp_processor_id()).irqs[IOINT_TAP]++;

	device = dev_get_drvdata(&cdev->dev);

	if (device == NULL) {

		return;