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>
16 /* define default numa node to 0 */
17 #define DEFAULT_NODE 0
20 * Even though we connect cpus to numa domains later in SMP
21 * init, we need to know the node ids now for all cpus.
23 static void __init of_numa_parse_cpu_nodes(void)
27 struct device_node *np;
29 for_each_of_cpu_node(np) {
30 r = of_property_read_u32(np, "numa-node-id", &nid);
34 pr_debug("CPU on %u\n", nid);
35 if (nid >= MAX_NUMNODES)
36 pr_warn("Node id %u exceeds maximum value\n", nid);
38 node_set(nid, numa_nodes_parsed);
42 static int __init of_numa_parse_memory_nodes(void)
44 struct device_node *np = NULL;
49 for_each_node_by_type(np, "memory") {
50 r = of_property_read_u32(np, "numa-node-id", &nid);
53 * property doesn't exist if -EINVAL, continue
54 * looking for more memory nodes with
55 * "numa-node-id" property
59 if (nid >= MAX_NUMNODES) {
60 pr_warn("Node id %u exceeds maximum value\n", nid);
64 for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++)
65 r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1);
69 pr_err("bad property in memory node\n");
77 static int __init of_numa_parse_distance_map_v1(struct device_node *map)
83 pr_info("parsing numa-distance-map-v1\n");
85 matrix = of_get_property(map, "distance-matrix", NULL);
87 pr_err("No distance-matrix property in distance-map\n");
91 entry_count = of_property_count_u32_elems(map, "distance-matrix");
92 if (entry_count <= 0) {
93 pr_err("Invalid distance-matrix\n");
97 for (i = 0; i + 2 < entry_count; i += 3) {
98 u32 nodea, nodeb, distance;
100 nodea = of_read_number(matrix, 1);
102 nodeb = of_read_number(matrix, 1);
104 distance = of_read_number(matrix, 1);
107 numa_set_distance(nodea, nodeb, distance);
108 pr_debug("distance[node%d -> node%d] = %d\n",
109 nodea, nodeb, distance);
111 /* Set default distance of node B->A same as A->B */
113 numa_set_distance(nodeb, nodea, distance);
119 static int __init of_numa_parse_distance_map(void)
122 struct device_node *np;
124 np = of_find_compatible_node(NULL, NULL,
125 "numa-distance-map-v1");
127 ret = of_numa_parse_distance_map_v1(np);
133 int of_node_to_nid(struct device_node *device)
135 struct device_node *np;
139 np = of_node_get(device);
142 r = of_property_read_u32(np, "numa-node-id", &nid);
144 * -EINVAL indicates the property was not found, and
145 * we walk up the tree trying to find a parent with a
146 * "numa-node-id". Any other type of error indicates
147 * a bad device tree and we give up.
152 np = of_get_next_parent(np);
155 pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n",
160 * If numa=off passed on command line, or with a defective
161 * device tree, the nid may not be in the set of possible
162 * nodes. Check for this case and return NUMA_NO_NODE.
164 if (!r && nid < MAX_NUMNODES && node_possible(nid))
170 int __init of_numa_init(void)
174 of_numa_parse_cpu_nodes();
175 r = of_numa_parse_memory_nodes();
178 return of_numa_parse_distance_map();