[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: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
index 0b7245c72d5e..179824b3082f 100644
--- a/drivers/s390/cio/device.h
+++ b/drivers/s390/cio/device.h
@@ -5,6 +5,7 @@
 #include <linux/atomic.h>
 #include <linux/wait.h>
 #include <linux/notifier.h>
+#include <linux/kernel_stat.h>
 #include "io_sch.h"
 
 /*
@@ -56,7 +57,17 @@ extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
 static inline void
 dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
 {
-        dev_jumptable[cdev->private->state][dev_event](cdev, dev_event);
+        int state = cdev->private->state;
+
+        if (dev_event == DEV_EVENT_INTERRUPT) {
+                if (state == DEV_STATE_ONLINE)
+                        kstat_cpu(smp_processor_id()).
+                                irqs[cdev->private->int_class]++;
+                else if (state != DEV_STATE_CMFCHANGE &&
+                         state != DEV_STATE_CMFUPDATE)
+                        kstat_cpu(smp_processor_id()).irqs[IOINT_CIO]++;
+        }
+        dev_jumptable[state][dev_event](cdev, dev_event);
 }
 
 /*