1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index 3fa7919f94a8..97dd2925ed6e 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -140,10 +140,30 @@ static ssize_t namespace_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(namespace);
 
+static ssize_t size_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct nd_btt *nd_btt = to_nd_btt(dev);
+        ssize_t rc;
+
+        device_lock(dev);
+        if (dev->driver)
+                rc = sprintf(buf, "%llu\n", nd_btt->size);
+        else {
+                /* no size to convey if the btt instance is disabled */
+                rc = -ENXIO;
+        }
+        device_unlock(dev);
+
+        return rc;
+}
+static DEVICE_ATTR_RO(size);
+
 static struct attribute *nd_btt_attributes[] = {
         &dev_attr_sector_size.attr,
         &dev_attr_namespace.attr,
         &dev_attr_uuid.attr,
+        &dev_attr_size.attr,
         NULL,
 };