[RFC,v5,4/8] memory: memory_region_find_by_name

Commit Message

Eric Auger Oct. 17, 2016, 7:38 p.m. UTC

This new helper makes possible to search for a MemoryRegion matching
a given name within a root MemoryRegion.

Signed-off-by: Eric Auger <[e-mail]>
---
 include/exec/memory.h | 11 +++++++++++
 memory.c              | 16 ++++++++++++++++
 2 files changed, 27 insertions(+)

Patch

diff --git a/include/exec/memory.h b/include/exec/memory.h
index f97b1f4..f62e5b5 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1217,6 +1217,17 @@  MemoryRegionSection memory_region_find(MemoryRegion *mr,
                                        hwaddr addr, uint64_t size);
 
 /**
+ * memory_region_find_by_name: Locates the first #MemoryRegion within @mr
+ * whose name matches @name
+ *
+ * @mr: the root MemoryRegion
+ * @name: name of the target MemoryRegion
+ *
+ * Returns the matched memory region or NULL
+ */
+MemoryRegion *memory_region_find_by_name(MemoryRegion *mr, const char *name);
+
+/**
  * memory_global_dirty_log_sync: synchronize the dirty log for all memory
  *
  * Synchronizes the dirty page log for all address spaces.
diff --git a/memory.c b/memory.c
index 00a0ebe..3701b4f 100644
--- a/memory.c
+++ b/memory.c
@@ -2166,6 +2166,22 @@  MemoryRegionSection memory_region_find(MemoryRegion *mr,
     return ret;
 }
 
+MemoryRegion *memory_region_find_by_name(MemoryRegion *root,
+                                         const char *name)
+{
+    MemoryRegion *other;
+
+    QTAILQ_FOREACH(other, &root->subregions, subregions_link) {
+        if (!strcmp(other->name, name)) {
+            memory_region_ref(other);
+            return other;
+        } else {
+            memory_region_find_by_name(other, name);
+        }
+    }
+    return NULL;
+}
+
 bool memory_region_present(MemoryRegion *container, hwaddr addr)
 {
     MemoryRegion *mr;