sparc64: add MDESC node name property to VIO device metadata

Add the MDESC node name of MDESC client to VIO device metadata. It is
later used to uniquely identify a node in the MDESC. VIO & MDESC APIs
are updated to handle this node name.

Signed-off-by: Jagannathan Raman <[e-mail]>
Reviewed-by: Liam Merwick <[e-mail]>
Reviewed-by: Shannon Nelson <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

arch/sparc/include/asm/mdesc.h

···
 void mdesc_update(void);
 
 struct mdesc_notifier_client {
-	void (*add)(struct mdesc_handle *handle, u64 node);
-	void (*remove)(struct mdesc_handle *handle, u64 node);
-
+	void (*add)(struct mdesc_handle *handle, u64 node,
+		    const char *node_name);
+	void (*remove)(struct mdesc_handle *handle, u64 node,
+		       const char *node_name);
 	const char			*node_name;
 	struct mdesc_notifier_client	*next;
 };

arch/sparc/include/asm/vio.h

···
 }
 
 #define VIO_MAX_TYPE_LEN	32
+#define VIO_MAX_NAME_LEN	32
 #define VIO_MAX_COMPAT_LEN	64
 
 struct vio_dev {
 	u64			mp;
 	struct device_node	*dp;
 
+	char			node_name[VIO_MAX_NAME_LEN];
 	char			type[VIO_MAX_TYPE_LEN];
 	char			compat[VIO_MAX_COMPAT_LEN];
 	int			compat_len;

arch/sparc/kernel/mdesc.c

···
 	client_list = client;
 
 	mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
-		client->add(cur_mdesc, node);
+		client->add(cur_mdesc, node, client->node_name);
 
 	mutex_unlock(&mdesc_mutex);
 }
···
 static void invoke_on_missing(const char *name,
 			      struct mdesc_handle *a,
 			      struct mdesc_handle *b,
-			      void (*func)(struct mdesc_handle *, u64))
+			      void (*func)(struct mdesc_handle *, u64,
+					   const char *node_name))
 {
-	u64 node;
+	mdesc_node_info_get_f get_info_func;
+	mdesc_node_info_rel_f rel_info_func;
+	mdesc_node_match_f node_match_func;
+	union md_node_info a_node_info;
+	union md_node_info b_node_info;
+	bool found;
+	u64 a_node;
+	u64 b_node;
+	int rv;
 
-	mdesc_for_each_node_by_name(a, node, name) {
-		int found = 0, is_vdc_port = 0;
-		const char *name_prop;
-		const u64 *id;
-		u64 fnode;
+	/*
+	 * Find the get_info, rel_info and node_match ops for the given
+	 * node name
+	 */
+	mdesc_get_node_ops(name, &get_info_func, &rel_info_func,
+			   &node_match_func);
 
-		name_prop = mdesc_get_property(a, node, "name", NULL);
-		if (name_prop && !strcmp(name_prop, "vdc-port")) {
-			is_vdc_port = 1;
-			id = parent_cfg_handle(a, node);
-		} else
-			id = mdesc_get_property(a, node, "id", NULL);
+	/* If we didn't find a match, the node type is not supported */
+	if (!get_info_func || !rel_info_func || !node_match_func) {
+		pr_err("MD: %s node type is not supported\n", name);
+		return;
+	}
 
-		if (!id) {
-			printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
-			       (name_prop ? name_prop : name));
+	mdesc_for_each_node_by_name(a, a_node, name) {
+		found = false;
+
+		rv = get_info_func(a, a_node, &a_node_info);
+		if (rv != 0) {
+			pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
+			       name);
 			continue;
 		}
 
-		mdesc_for_each_node_by_name(b, fnode, name) {
-			const u64 *fid;
+		/* Check each node in B for node matching a_node */
+		mdesc_for_each_node_by_name(b, b_node, name) {
+			rv = get_info_func(b, b_node, &b_node_info);
+			if (rv != 0)
+				continue;
 
-			if (is_vdc_port) {
-				name_prop = mdesc_get_property(b, fnode,
-							       "name", NULL);
-				if (!name_prop ||
-				    strcmp(name_prop, "vdc-port"))
-					continue;
-				fid = parent_cfg_handle(b, fnode);
-				if (!fid) {
-					printk(KERN_ERR "MD: Cannot find ID "
-					       "for vdc-port node.\n");
-					continue;
-				}
-			} else
-				fid = mdesc_get_property(b, fnode,
-							 "id", NULL);
-
-			if (*id == *fid) {
-				found = 1;
+			if (node_match_func(&a_node_info, &b_node_info)) {
+				found = true;
+				rel_info_func(&b_node_info);
 				break;
 			}
+
+			rel_info_func(&b_node_info);
 		}
+
+		rel_info_func(&a_node_info);
+
 		if (!found)
-			func(a, node);
+			func(a, a_node, name);
 	}
 }
 

arch/sparc/kernel/vio.c

···
 EXPORT_SYMBOL(vio_set_intr);
 
 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
+				      const char *node_name,
 				      struct device *parent)
 {
 	const char *type, *compat, *bus_id_name;
···
 			tlen = strlen(type) + 1;
 		}
 	}
-	if (tlen > VIO_MAX_TYPE_LEN) {
+	if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) {
 		printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
 		       type);
 		return NULL;
···
 
 	printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
 
+	/* node_name is NULL for the parent/channel-devices node */
+	if (node_name != NULL)
+		(void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
+				node_name);
+
 	err = device_register(&vdev->dev);
 	if (err) {
 		printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
···
 	return vdev;
 }
 
-static void vio_add(struct mdesc_handle *hp, u64 node)
+static void vio_add(struct mdesc_handle *hp, u64 node,
+		    const char *node_name)
 {
-	(void) vio_create_one(hp, node, &root_vdev->dev);
+	(void) vio_create_one(hp, node, node_name, &root_vdev->dev);
 }
 
 struct vio_md_node_query {
···
 	return 1;
 }
 
-static void vio_remove(struct mdesc_handle *hp, u64 node)
+static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
 {
 	const char *type;
 	const u64 *id, *cfg_handle;
···
  * under "openboot" that we should not mess with as aparently that is
  * reserved exclusively for OBP use.
  */
-static void vio_add_ds(struct mdesc_handle *hp, u64 node)
+static void vio_add_ds(struct mdesc_handle *hp, u64 node,
+		       const char *node_name)
 {
 	int found;
 	u64 a;
···
 	}
 
 	if (found)
-		(void) vio_create_one(hp, node, &root_vdev->dev);
+		(void) vio_create_one(hp, node, node_name, &root_vdev->dev);
 }
 
 static struct mdesc_notifier_client vio_ds_notifier = {
···
 
 	cdev_cfg_handle = *cfg_handle;
 
-	root_vdev = vio_create_one(hp, root, NULL);
+	root_vdev = vio_create_one(hp, root, NULL, NULL);
 	err = -ENODEV;
 	if (!root_vdev) {
 		printk(KERN_ERR "VIO: Could not create root device.\n");