From ab97d211ef1863942a90d7c93dfd563f0381ca87 Mon Sep 17 00:00:00 2001
From: Sebastian Ott <sebott@linux.vnet.ibm.com>
Date: Wed, 9 Sep 2015 10:29:59 +0200
Subject: s390/cio: reactivate cmf after hibernate

During resume from hibernate we already reenable measurement block
updates on a per device basis. In addition to that we also need to
activate channel measurement globally using the set channel monitor
instruction.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index de7074f..b2afad5 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -1312,6 +1312,19 @@ int cmf_reenable(struct ccw_device *cdev)
 	return cmbops->set(cdev, 2);
 }
 
+/**
+ * cmf_reactivate() - reactivate measurement block updates
+ *
+ * Use this during resume from hibernate.
+ */
+void cmf_reactivate(void)
+{
+	spin_lock(&cmb_area.lock);
+	if (!list_empty(&cmb_area.list))
+		cmf_activate(cmb_area.mem, 1);
+	spin_unlock(&cmb_area.lock);
+}
+
 static int __init init_cmbe(void)
 {
 	cmbe_cache = kmem_cache_create("cmbe_cache", sizeof(struct cmbe),
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 0268e5f..25b4ee1 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -1089,6 +1089,7 @@ void channel_subsystem_reinit(void)
 		if (chp)
 			chp_update_desc(chp);
 	}
+	cmf_reactivate();
 }
 
 #ifdef CONFIG_PROC_FS
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
index 8d1d298..6b17119 100644
--- a/drivers/s390/cio/device.h
+++ b/drivers/s390/cio/device.h
@@ -145,6 +145,7 @@ void ccw_device_set_timeout(struct ccw_device *, int);
 void retry_set_schib(struct ccw_device *cdev);
 void cmf_retry_copy_block(struct ccw_device *);
 int cmf_reenable(struct ccw_device *);
+void cmf_reactivate(void);
 int ccw_set_cmf(struct ccw_device *cdev, int enable);
 extern struct device_attribute dev_attr_cmb_enable;
 #endif
-- 
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