s390/diag: add a statistic for diagnose calls

Introduce /sys/debug/kernel/diag_stat with a statistic how many diagnose
calls have been done by each CPU in the system.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

4 files changed, 20 insertions, 3 deletions

diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index c062f1620c58..cb61f300f8b5 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -21,6 +21,7 @@
 
 #include <asm/dasd.h>
 #include <asm/debug.h>
+#include <asm/diag.h>
 #include <asm/ebcdic.h>
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -76,6 +77,7 @@ static inline int dia250(void *iob, int cmd)
 	int rc;
 
 	rc = 3;
+	diag_stat_inc(DIAG_STAT_X250);
 	asm volatile(
 		"	diag	2,%2,0x250\n"
 		"0:	ipm	%0\n"
diff --git a/drivers/s390/char/diag_ftp.c b/drivers/s390/char/diag_ftp.c
index 12db8db04cdd..a5ccbf6f0d36 100644
--- a/drivers/s390/char/diag_ftp.c
+++ b/drivers/s390/char/diag_ftp.c
@@ -15,6 +15,7 @@
 #include <linux/wait.h>
 #include <linux/string.h>
 #include <asm/ctl_reg.h>
+#include <asm/diag.h>
 
 #include "hmcdrv_ftp.h"
 #include "diag_ftp.h"
@@ -102,6 +103,7 @@ static int diag_ftp_2c4(struct diag_ftp_ldfpl *fpl,
 {
 	int rc;
 
+	diag_stat_inc(DIAG_STAT_X2C4);
 	asm volatile(
 		"	diag	%[addr],%[cmd],0x2c4\n"
 		"0:	j	2f\n"
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index e9fae30fafda..b2a1a81e6fc8 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -28,6 +28,7 @@
 #include <linux/io.h>
 #include <linux/kvm_para.h>
 #include <linux/notifier.h>
+#include <asm/diag.h>
 #include <asm/setup.h>
 #include <asm/irq.h>
 #include <asm/cio.h>
@@ -366,9 +367,9 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
 	kfree(thinint_area);
 }
 
-static inline long do_kvm_notify(struct subchannel_id schid,
-				 unsigned long queue_index,
-				 long cookie)
+static inline long __do_kvm_notify(struct subchannel_id schid,
+				   unsigned long queue_index,
+				   long cookie)
 {
 	register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
 	register struct subchannel_id __schid asm("2") = schid;
@@ -383,6 +384,14 @@ static inline long do_kvm_notify(struct subchannel_id schid,
 	return __rc;
 }
 
+static inline long do_kvm_notify(struct subchannel_id schid,
+				 unsigned long queue_index,
+				 long cookie)
+{
+	diag_stat_inc(DIAG_STAT_X500);
+	return __do_kvm_notify(schid, queue_index, cookie);
+}
+
 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
 {
 	struct virtio_ccw_vq_info *info = vq->priv;
diff --git a/drivers/watchdog/diag288_wdt.c b/drivers/watchdog/diag288_wdt.c
index a9a5210143ae..3db9d0e0673d 100644
--- a/drivers/watchdog/diag288_wdt.c
+++ b/drivers/watchdog/diag288_wdt.c
@@ -29,6 +29,7 @@
 #include <linux/watchdog.h>
 #include <linux/suspend.h>
 #include <asm/ebcdic.h>
+#include <asm/diag.h>
 #include <linux/io.h>
 #include <linux/uaccess.h>
 
@@ -94,12 +95,14 @@ static int __diag288(unsigned int func, unsigned int timeout,
 static int __diag288_vm(unsigned int  func, unsigned int timeout,
 			char *cmd, size_t len)
 {
+	diag_stat_inc(DIAG_STAT_X288);
 	return __diag288(func, timeout, virt_to_phys(cmd), len);
 }
 
 static int __diag288_lpar(unsigned int func, unsigned int timeout,
 			  unsigned long action)
 {
+	diag_stat_inc(DIAG_STAT_X288);
 	return __diag288(func, timeout, action, 0);
 }
 
@@ -141,6 +144,7 @@ static int wdt_stop(struct watchdog_device *dev)
 {
 	int ret;
 
+	diag_stat_inc(DIAG_STAT_X288);
 	ret = __diag288(WDT_FUNC_CANCEL, 0, 0, 0);
 	return ret;
 }