[PATCH v3 1/5] util: Add iova_tree_foreach_range_data

[Zhenzhong Duan]

This function is a variant of iova_tree_foreach and support tranversing
a range to trigger callback with a private data.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/qemu/iova-tree.h | 17 +++++++++++++++--
 util/iova-tree.c         | 31 +++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/include/qemu/iova-tree.h b/include/qemu/iova-tree.h
index 8528e5c98fbc..df3dba79e671 100644
--- a/include/qemu/iova-tree.h
+++ b/include/qemu/iova-tree.h
@@ -39,6 +39,7 @@ typedef struct DMAMap {
     IOMMUAccessFlags perm;
 } QEMU_PACKED DMAMap;
 typedef gboolean (*iova_tree_iterator)(DMAMap *map);
+typedef gboolean (*iova_tree_iterator_2)(DMAMap *map, gpointer *private);
 
 /**
  * iova_tree_new:
@@ -131,11 +132,23 @@ const DMAMap *iova_tree_find_address(const IOVATree 
*tree, hwaddr iova);
  * @iterator: the interator for the mappings, return true to stop
  *
  * Iterate over the iova tree.
- *
- * Return: 1 if found any overlap, 0 if not, <0 if error.
  */
 void iova_tree_foreach(IOVATree *tree, iova_tree_iterator iterator);
 
+/**
+ * iova_tree_foreach_range_data:
+ *
+ * @tree: the iova tree to iterate on
+ * @range: the iova range to iterate in
+ * @func: the interator for the mappings, return true to stop
+ * @private: parameter passed to @func
+ *
+ * Iterate over an iova range in iova tree.
+ */
+void iova_tree_foreach_range_data(IOVATree *tree, DMAMap *range,
+                                  iova_tree_iterator_2 func,
+                                  gpointer *private);
+
 /**
  * iova_tree_alloc_map:
  *
diff --git a/util/iova-tree.c b/util/iova-tree.c
index 536789797e47..a3cbd5198410 100644
--- a/util/iova-tree.c
+++ b/util/iova-tree.c
@@ -42,6 +42,12 @@ typedef struct IOVATreeFindIOVAArgs {
     const DMAMap *result;
 } IOVATreeFindIOVAArgs;
 
+typedef struct IOVATreeIterator {
+    DMAMap *range;
+    iova_tree_iterator_2 func;
+    gpointer *private;
+} IOVATreeIterator;
+
 /**
  * Iterate args to the next hole
  *
@@ -164,6 +170,31 @@ void iova_tree_foreach(IOVATree *tree, iova_tree_iterator 
iterator)
     g_tree_foreach(tree->tree, iova_tree_traverse, iterator);
 }
 
+static gboolean iova_tree_traverse_range(gpointer key, gpointer value,
+                                         gpointer data)
+{
+    DMAMap *map = key;
+    IOVATreeIterator *iterator = data;
+    DMAMap *range = iterator->range;
+
+    g_assert(key == value);
+
+    if (iova_tree_compare(map, range, NULL)) {
+        return false;
+    }
+
+    return iterator->func(map, iterator->private);
+}
+
+void iova_tree_foreach_range_data(IOVATree *tree, DMAMap *range,
+                                  iova_tree_iterator_2 func,
+                                  gpointer *private)
+{
+    IOVATreeIterator iterator = {range, func, private};
+
+    g_tree_foreach(tree->tree, iova_tree_traverse_range, &iterator);
+}
+
 void iova_tree_remove(IOVATree *tree, DMAMap map)
 {
     const DMAMap *overlap;
-- 
2.34.1