Merge branches 'x86/amd', 'x86/vt-d', 'arm/exynos', 'arm/mediatek', 'arm/renesas...

[cascardo/linux.git] / drivers / nvdimm / btt_devs.c

diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index 3fa7919..97dd292 100644 (file)
--- 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,
 };