s390/hvc_iucv: Display connection details through device attributes

Add device attributes to display details about the connection status
of HVC IUCV terminals.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/tty/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
index ba6b3f4b15df..fbd023cee4ba 100644
--- a/drivers/tty/hvc/hvc_iucv.c
+++ b/drivers/tty/hvc/hvc_iucv.c
@@ -77,6 +77,7 @@ struct hvc_iucv_private {
         struct list_head        tty_outqueue;   /* outgoing IUCV messages */
         struct list_head        tty_inqueue;    /* incoming IUCV messages */
         struct device           *dev;           /* device structure */
+        u8                      info_path[16];  /* IUCV path info (dev attr) */
 };
 
 struct iucv_tty_buffer {
@@ -826,6 +827,10 @@ static	int hvc_iucv_path_pending(struct iucv_path *path,
         priv->path = path;
         priv->iucv_state = IUCV_CONNECTED;
 
+        /* store path information */
+        memcpy(priv->info_path, ipvmid, 8);
+        memcpy(priv->info_path + 8, ipuser + 8, 8);
+
         /* flush buffered output data... */
         schedule_delayed_work(&priv->sndbuf_work, 5);
 
@@ -960,6 +965,49 @@ static int hvc_iucv_pm_restore_thaw(struct device *dev)
         return 0;
 }
 
+static ssize_t hvc_iucv_dev_termid_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+        struct hvc_iucv_private *priv = dev_get_drvdata(dev);
+        size_t len;
+
+        len = sizeof(priv->srv_name);
+        memcpy(buf, priv->srv_name, len);
+        EBCASC(buf, len);
+        buf[len++] = '\n';
+        return len;
+}
+
+static ssize_t hvc_iucv_dev_state_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+        struct hvc_iucv_private *priv = dev_get_drvdata(dev);
+        return sprintf(buf, "%u:%u\n", priv->iucv_state, priv->tty_state);
+}
+
+static ssize_t hvc_iucv_dev_peer_show(struct device *dev,
+                                      struct device_attribute *attr,
+                                      char *buf)
+{
+        struct hvc_iucv_private *priv = dev_get_drvdata(dev);
+        char vmid[9], ipuser[9];
+
+        memset(vmid, 0, sizeof(vmid));
+        memset(ipuser, 0, sizeof(ipuser));
+
+        spin_lock_bh(&priv->lock);
+        if (priv->iucv_state == IUCV_CONNECTED) {
+                memcpy(vmid, priv->info_path, 8);
+                memcpy(ipuser, priv->info_path + 8, 8);
+        }
+        spin_unlock_bh(&priv->lock);
+        EBCASC(ipuser, 8);
+
+        return sprintf(buf, "%s:%s\n", vmid, ipuser);
+}
+
 
 /* HVC operations */
 static const struct hv_ops hvc_iucv_ops = {
@@ -985,6 +1033,25 @@ static struct device_driver hvc_iucv_driver = {
         .pm   = &hvc_iucv_pm_ops,
 };
 
+/* IUCV HVC device attributes */
+static DEVICE_ATTR(termid, 0640, hvc_iucv_dev_termid_show, NULL);
+static DEVICE_ATTR(state, 0640, hvc_iucv_dev_state_show, NULL);
+static DEVICE_ATTR(peer, 0640, hvc_iucv_dev_peer_show, NULL);
+static struct attribute *hvc_iucv_dev_attrs[] = {
+        &dev_attr_termid.attr,
+        &dev_attr_state.attr,
+        &dev_attr_peer.attr,
+        NULL,
+};
+static struct attribute_group hvc_iucv_dev_attr_group = {
+        .attrs = hvc_iucv_dev_attrs,
+};
+static const struct attribute_group *hvc_iucv_dev_attr_groups[] = {
+        &hvc_iucv_dev_attr_group,
+        NULL,
+};
+
+
 /**
  * hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance
  * @id:                 hvc_iucv_table index
@@ -1046,6 +1113,7 @@ static int __init hvc_iucv_alloc(int id, unsigned int is_console)
         priv->dev->bus = &iucv_bus;
         priv->dev->parent = iucv_root;
         priv->dev->driver = &hvc_iucv_driver;
+        priv->dev->groups = hvc_iucv_dev_attr_groups;
         priv->dev->release = (void (*)(struct device *)) kfree;
         rc = device_register(priv->dev);
         if (rc) {