1 files changed, 102 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index c1c6f1381150..216bc4fba199 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -45,6 +45,7 @@ struct dasd_devmap {
         unsigned int devindex;
         unsigned short features;
         struct dasd_device *device;
+        struct dasd_uid uid;
 };
 
 /*
@@ -716,6 +717,68 @@ dasd_discipline_show(struct device *dev, struct device_attribute *attr, char *bu
 
 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
 
+static ssize_t
+dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct dasd_devmap *devmap;
+        int alias;
+
+        devmap = dasd_find_busid(dev->bus_id);
+        spin_lock(&dasd_devmap_lock);
+        if (!IS_ERR(devmap))
+                alias = devmap->uid.alias;
+        else
+                alias = 0;
+        spin_unlock(&dasd_devmap_lock);
+
+        return sprintf(buf, alias ? "1\n" : "0\n");
+}
+
+static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
+
+static ssize_t
+dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct dasd_devmap *devmap;
+        char *vendor;
+
+        devmap = dasd_find_busid(dev->bus_id);
+        spin_lock(&dasd_devmap_lock);
+        if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0)
+                vendor = devmap->uid.vendor;
+        else
+                vendor = "";
+        spin_unlock(&dasd_devmap_lock);
+
+        return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
+}
+
+static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
+
+#define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
+                     /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1)
+
+static ssize_t
+dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct dasd_devmap *devmap;
+        char uid[UID_STRLEN];
+
+        devmap = dasd_find_busid(dev->bus_id);
+        spin_lock(&dasd_devmap_lock);
+        if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0)
+                snprintf(uid, sizeof(uid), "%s.%s.%04x.%02x",
+                         devmap->uid.vendor, devmap->uid.serial,
+                         devmap->uid.ssid, devmap->uid.unit_addr);
+        else
+                uid[0] = 0;
+        spin_unlock(&dasd_devmap_lock);
+
+        return snprintf(buf, PAGE_SIZE, "%s\n", uid);
+}
+
+static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
+
 /*
  * extended error-reporting
  */
@@ -759,6 +822,9 @@ static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
 static struct attribute * dasd_attrs[] = {
         &dev_attr_readonly.attr,
         &dev_attr_discipline.attr,
+        &dev_attr_alias.attr,
+        &dev_attr_vendor.attr,
+        &dev_attr_uid.attr,
         &dev_attr_use_diag.attr,
         &dev_attr_eer_enabled.attr,
         NULL,
@@ -768,6 +834,42 @@ static struct attribute_group dasd_attr_group = {
         .attrs = dasd_attrs,
 };
 
+
+/*
+ * Return copy of the device unique identifier.
+ */
+int
+dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid)
+{
+        struct dasd_devmap *devmap;
+
+        devmap = dasd_find_busid(cdev->dev.bus_id);
+        if (IS_ERR(devmap))
+                return PTR_ERR(devmap);
+        spin_lock(&dasd_devmap_lock);
+        *uid = devmap->uid;
+        spin_unlock(&dasd_devmap_lock);
+        return 0;
+}
+
+/*
+ * Register the given device unique identifier into devmap struct.
+ */
+int
+dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid)
+{
+        struct dasd_devmap *devmap;
+
+        devmap = dasd_find_busid(cdev->dev.bus_id);
+        if (IS_ERR(devmap))
+                return PTR_ERR(devmap);
+        spin_lock(&dasd_devmap_lock);
+        devmap->uid = *uid;
+        spin_unlock(&dasd_devmap_lock);
+        return 0;
+}
+EXPORT_SYMBOL(dasd_set_uid);
+
 /*
  * Return value of the specified feature.
  */