From: Harald Freudenberger <freude@linux.ibm.com>
Subject: s390/zcrypt: Show load of cards and queues in sysfs
Patch-mainline: v4.19-rc1
Git-commit: 4a07750ba8f3f45f0be730f7370c2c21a7491cd7
References: FATE#325689, LTC#167899, bsc#1113520

Summary:     zcrypt: AP bus support for alternate driver(s)
Description: AP bus support for alternate driver(s) and deterministic
             driver binding. For details please read the patch header
             for commit 7e0bdbe5c21cb8316a694e46ad5aad339f6894a6

Upstream-Description:

             s390/zcrypt: Show load of cards and queues in sysfs

             Show the current load value of cards and queues in sysfs.
             The load value for each card and queue is maintained by
             the zcrypt device driver for dispatching and load
             balancing requests over the available devices.

             This patch provides the load value to userspace via a
             new read only sysfs attribute 'load' per card and queue.

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

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/crypto/zcrypt_card.c  |   12 ++++++++++++
 drivers/s390/crypto/zcrypt_queue.c |   12 ++++++++++++
 2 files changed, 24 insertions(+)

--- a/drivers/s390/crypto/zcrypt_card.c
+++ b/drivers/s390/crypto/zcrypt_card.c
@@ -92,9 +92,21 @@ static ssize_t zcrypt_card_online_store(
 static DEVICE_ATTR(online, 0644, zcrypt_card_online_show,
 		   zcrypt_card_online_store);
 
+static ssize_t zcrypt_card_load_show(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	struct zcrypt_card *zc = to_ap_card(dev)->private;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load));
+}
+
+static DEVICE_ATTR(load, 0444, zcrypt_card_load_show, NULL);
+
 static struct attribute *zcrypt_card_attrs[] = {
 	&dev_attr_type.attr,
 	&dev_attr_online.attr,
+	&dev_attr_load.attr,
 	NULL,
 };
 
--- a/drivers/s390/crypto/zcrypt_queue.c
+++ b/drivers/s390/crypto/zcrypt_queue.c
@@ -84,8 +84,20 @@ static ssize_t zcrypt_queue_online_store
 static DEVICE_ATTR(online, 0644, zcrypt_queue_online_show,
 		   zcrypt_queue_online_store);
 
+static ssize_t zcrypt_queue_load_show(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load));
+}
+
+static DEVICE_ATTR(load, 0444, zcrypt_queue_load_show, NULL);
+
 static struct attribute *zcrypt_queue_attrs[] = {
 	&dev_attr_online.attr,
+	&dev_attr_load.attr,
 	NULL,
 };