[PATCH v2 10/17] xen/arm: unified entry to parse all NUMA data from device tree

[Wei Chen <wei.chen@xxxxxxx>]

In this function, we scan the whole device tree to parse CPU node id,
memory node id and distance-map. Though early_scan_node will invoke
a handler to process memory nodes. If we want to parse memory node id
in that handler, we have to embed NUMA parse code in that handler.
But we still need to scan whole device tree to find CPU NUMA id and
distance-map. In this case, we include memory NUMA id parse in this
function too. Another benefit is that we have a unique entry for device
tree NUMA data parse.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
---
v1->v2:
1. Fix typos in commit message.
2. Fix code style and align parameters.
3. Use strncmp to replace memcmp.
---
 xen/arch/arm/include/asm/numa.h |  1 +
 xen/arch/arm/numa_device_tree.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/xen/arch/arm/include/asm/numa.h b/xen/arch/arm/include/asm/numa.h
index 923ffbfd42..1213d30ce0 100644
--- a/xen/arch/arm/include/asm/numa.h
+++ b/xen/arch/arm/include/asm/numa.h
@@ -44,6 +44,7 @@ extern enum dt_numa_status device_tree_numa;
 extern void numa_set_distance(nodeid_t from, nodeid_t to,
                               unsigned int distance);
 extern void numa_detect_cpu_node(unsigned int cpu);
+extern int numa_device_tree_init(const void *fdt);
 
 #else
 
diff --git a/xen/arch/arm/numa_device_tree.c b/xen/arch/arm/numa_device_tree.c
index 88056e7ef8..4009b9b6de 100644
--- a/xen/arch/arm/numa_device_tree.c
+++ b/xen/arch/arm/numa_device_tree.c
@@ -258,3 +258,33 @@ invalid_data:
     numa_fw_bad();
     return -EINVAL;
 }
+
+static int __init fdt_scan_numa_nodes(const void *fdt, int node,
+                                      const char *uname, int depth,
+                                      unsigned int address_cells,
+                                      unsigned int size_cells, void *data)
+{
+    int len, ret = 0;
+    const void *prop;
+
+    prop = fdt_getprop(fdt, node, "device_type", &len);
+    if ( prop )
+    {
+        if ( strncmp(prop, "cpu", len) == 0 )
+            ret = fdt_parse_numa_cpu_node(fdt, node);
+        else if ( strncmp(prop, "memory", len) == 0 )
+            ret = fdt_parse_numa_memory_node(fdt, node, uname,
+                                address_cells, size_cells);
+    }
+    else if ( fdt_node_check_compatible(fdt, node,
+                                        "numa-distance-map-v1") == 0 )
+        ret = fdt_parse_numa_distance_map_v1(fdt, node);
+
+    return ret;
+}
+
+/* Initialize NUMA from device tree */
+int __init numa_device_tree_init(const void *fdt)
+{
+    return device_tree_for_each_node(fdt, 0, fdt_scan_numa_nodes, NULL);
+}
-- 
2.25.1