[S390] tape: add support for irq statistics

Add support for ccw based tape 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>

diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h
index 65e63c0..6986343 100644 (file)
--- a/arch/s390/include/asm/irq.h
+++ b/arch/s390/include/asm/irq.h
@@ -20,6 +20,7 @@ enum interruption_class {
        IOINT_DAS,
        IOINT_C15,
        IOINT_C70,
+       IOINT_TAP,
        NMI_NMI,
        NR_IRQS,
 };

diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 8c24141..5d7b6fb 100644 (file)
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -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" },
 };
 

diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c
index b3a3e8e..7978a0a 100644 (file)
--- a/drivers/s390/char/tape_core.c
+++ b/drivers/s390/char/tape_core.c
@@ -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;