1 // SPDX-License-Identifier: GPL-2.0
3 * OF NUMA Parsing support.
5 * Copyright (C) 2015 - 2016 Cavium Inc.
8 #define pr_fmt(fmt) "OF: NUMA: " fmt
11 #include <linux/of_address.h>
12 #include <linux/nodemask.h>
13 #include <linux/numa_memblks.h>
18 * Even though we connect cpus to numa domains later in SMP
19 * init, we need to know the node ids now for all cpus.
21 static void __init of_numa_parse_cpu_nodes(void)
25 struct device_node *np;
27 for_each_of_cpu_node(np) {
28 r = of_property_read_u32(np, "numa-node-id", &nid);
32 pr_debug("CPU on %u\n", nid);
33 if (nid >= MAX_NUMNODES)
34 pr_warn("Node id %u exceeds maximum value\n", nid);
36 node_set(nid, numa_nodes_parsed);
40 static int __init of_numa_parse_memory_nodes(void)
42 struct device_node *np = NULL;
47 for_each_node_by_type(np, "memory") {
48 r = of_property_read_u32(np, "numa-node-id", &nid);
51 * property doesn't exist if -EINVAL, continue
52 * looking for more memory nodes with
53 * "numa-node-id" property
57 if (nid >= MAX_NUMNODES) {
58 pr_warn("Node id %u exceeds maximum value\n", nid);
62 for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++)
63 r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1);
67 pr_err("bad property in memory node\n");
75 static int __init of_numa_parse_distance_map_v1(struct device_node *map)
81 pr_info("parsing numa-distance-map-v1\n");
83 matrix = of_get_property(map, "distance-matrix", NULL);
85 pr_err("No distance-matrix property in distance-map\n");
89 entry_count = of_property_count_u32_elems(map, "distance-matrix");
90 if (entry_count <= 0) {
91 pr_err("Invalid distance-matrix\n");
95 for (i = 0; i + 2 < entry_count; i += 3) {
96 u32 nodea, nodeb, distance;
98 nodea = of_read_number(matrix, 1);
100 nodeb = of_read_number(matrix, 1);
102 distance = of_read_number(matrix, 1);
105 if ((nodea == nodeb && distance != LOCAL_DISTANCE) ||
106 (nodea != nodeb && distance <= LOCAL_DISTANCE)) {
107 pr_err("Invalid distance[node%d -> node%d] = %d\n",
108 nodea, nodeb, distance);
112 node_set(nodea, numa_nodes_parsed);
114 numa_set_distance(nodea, nodeb, distance);
116 /* Set default distance of node B->A same as A->B */
118 numa_set_distance(nodeb, nodea, distance);
124 static int __init of_numa_parse_distance_map(void)
127 struct device_node *np;
129 np = of_find_compatible_node(NULL, NULL,
130 "numa-distance-map-v1");
132 ret = of_numa_parse_distance_map_v1(np);
138 int of_node_to_nid(struct device_node *device)
140 struct device_node *np;
144 np = of_node_get(device);
147 r = of_property_read_u32(np, "numa-node-id", &nid);
149 * -EINVAL indicates the property was not found, and
150 * we walk up the tree trying to find a parent with a
151 * "numa-node-id". Any other type of error indicates
152 * a bad device tree and we give up.
157 np = of_get_next_parent(np);
160 pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n",
165 * If numa=off passed on command line, or with a defective
166 * device tree, the nid may not be in the set of possible
167 * nodes. Check for this case and return NUMA_NO_NODE.
169 if (!r && nid < MAX_NUMNODES && node_possible(nid))
175 int __init of_numa_init(void)
179 of_numa_parse_cpu_nodes();
180 r = of_numa_parse_memory_nodes();
183 return of_numa_parse_distance_map();