Commit de400d6b authored by Peter Oberparleiter's avatar Peter Oberparleiter Committed by Martin Schwidefsky
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[S390] fix mismatch in summation of I/O IRQ statistics 



Current IRQ statistics support does not show detail counts for I/O
interrupts which are processed internally only. The result is a
summation count which is way off such as this one:

           CPU0       CPU1       CPU2
I/O:       1331        710        442
[...]
QAI:         15         16         16   [I/O] QDIO Adapter Interrupt
QDI:          1          0          0   [I/O] QDIO Interrupt
DAS:        706        645        381   [I/O] DASD
C15:         26         10          0   [I/O] 3215
C70:          0          0          0   [I/O] 3270
TAP:          0          0          0   [I/O] Tape
VMR:          0          0          0   [I/O] Unit Record Devices
LCS:          0          0          0   [I/O] LCS
CLW:          0          0          0   [I/O] CLAW
CTC:          0          0          0   [I/O] CTC
APB:          0          0          0   [I/O] AP Bus

Fix this by moving I/O interrupt accounting into the common I/O layer.

Signed-off-by: default avatarPeter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent ce949717

arch/s390/include/asm/ccwdev.h

+3 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/device.h>

#include <linux/mod_devicetable.h>

#include <asm/fcx.h>

#include <asm/irq.h>



/* structs from asm/cio.h */

struct irb;
@@ -127,6 +128,7 @@ enum uc_todo { 
 * @restore: callback for restoring after hibernation

 * @uc_handler: callback for unit check handler

 * @driver: embedded device driver structure

 * @int_class: interruption class to use for accounting interrupts

 */

struct ccw_driver {

	struct ccw_device_id *ids;
@@ -144,6 +146,7 @@ struct ccw_driver { 
	int (*restore)(struct ccw_device *);

	enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);

	struct device_driver driver;

	enum interruption_class int_class;

};



extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,

arch/s390/include/asm/irq.h

+1 −1
Original line number Diff line number Diff line
@@ -17,8 +17,8 @@ enum interruption_class { 
	EXTINT_SCP,

	EXTINT_IUC,

	EXTINT_CPM,

	IOINT_CIO,

	IOINT_QAI,

	IOINT_QDI,

	IOINT_DAS,

	IOINT_C15,

	IOINT_C70,

arch/s390/kernel/irq.c

+1 −1
Original line number Diff line number Diff line
@@ -42,8 +42,8 @@ static const struct irq_class intrclass_names[] = { 
	{.name = "SCP", .desc = "[EXT] Service Call" },

	{.name = "IUC", .desc = "[EXT] IUCV" },

	{.name = "CPM", .desc = "[EXT] CPU Measurement" },

	{.name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt" },

	{.name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt" },

	{.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" },

drivers/s390/block/dasd.c

+0 −2
Original line number Diff line number Diff line
@@ -11,7 +11,6 @@ 
#define KMSG_COMPONENT "dasd"

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt



#include <linux/kernel_stat.h>

#include <linux/kmod.h>

#include <linux/init.h>

#include <linux/interrupt.h>
@@ -1594,7 +1593,6 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, 
	unsigned long long now;

	int expires;



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

	if (IS_ERR(irb)) {

		switch (PTR_ERR(irb)) {

		case -EIO:

drivers/s390/block/dasd_eckd.c

+1 −0
Original line number Diff line number Diff line
@@ -3998,6 +3998,7 @@ static struct ccw_driver dasd_eckd_driver = { 
	.thaw	     = dasd_generic_restore_device,

	.restore     = dasd_generic_restore_device,

	.uc_handler  = dasd_generic_uc_handler,

	.int_class   = IOINT_DAS,

};



/*

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