s390/cio: add util_string sysfs attribute

Export utility strings as a chpid's binary sysfs attribute.

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

diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index 41ecc08..afbdee7 100644 (file)
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -384,6 +384,28 @@ static ssize_t chp_chid_external_show(struct device *dev,
 }
 static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL);
 
+static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
+                               struct bin_attribute *attr, char *buf,
+                               loff_t off, size_t count)
+{
+       struct channel_path *chp = to_channelpath(kobj_to_dev(kobj));
+       ssize_t rc;
+
+       mutex_lock(&chp->lock);
+       rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str,
+                                    sizeof(chp->desc_fmt3.util_str));
+       mutex_unlock(&chp->lock);
+
+       return rc;
+}
+static BIN_ATTR_RO(util_string,
+                  sizeof(((struct channel_path_desc_fmt3 *)0)->util_str));
+
+static struct bin_attribute *chp_bin_attrs[] = {
+       &bin_attr_util_string,
+       NULL,
+};
+
 static struct attribute *chp_attrs[] = {
        &dev_attr_status.attr,
        &dev_attr_configure.attr,
@@ -396,6 +418,7 @@ static struct attribute *chp_attrs[] = {
 };
 static struct attribute_group chp_attr_group = {
        .attrs = chp_attrs,
+       .bin_attrs = chp_bin_attrs,
 };
 static const struct attribute_group *chp_attr_groups[] = {
        &chp_attr_group,