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>

diff --git a/drivers/s390/crypto/zcrypt_card.c b/drivers/s390/crypto/zcrypt_card.c
index 233e1e695208b9b870edb4259127c41e2ee3357a..da2c8dfd4d741edc6c8b380e850667f79a44440f 100644 (file)
--- a/drivers/s390/crypto/zcrypt_card.c
+++ b/drivers/s390/crypto/zcrypt_card.c
@@ -83,9 +83,21 @@ static ssize_t zcrypt_card_online_store(struct device *dev,
 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,
 };
 

diff --git a/drivers/s390/crypto/zcrypt_queue.c b/drivers/s390/crypto/zcrypt_queue.c
index 720434e18007e3a8e1c9e5228c4841ba0cb782a5..91a52f26835307f3b04c54a8bb9544fe694495a2 100644 (file)
--- a/drivers/s390/crypto/zcrypt_queue.c
+++ b/drivers/s390/crypto/zcrypt_queue.c
@@ -75,8 +75,20 @@ static ssize_t zcrypt_queue_online_store(struct device *dev,
 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,
 };