1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * OF NUMA Parsing support.
4 *
5 * Copyright (C) 2015 - 2016 Cavium Inc.
6 */
7
8 #define pr_fmt(fmt) "OF: NUMA: " fmt
9
10 #include <linux/of.h>
11 #include <linux/of_address.h>
12 #include <linux/nodemask.h>
13 #include <linux/numa_memblks.h>
14
15 #include <asm/numa.h>
16
17 /* define default numa node to 0 */
18 #define DEFAULT_NODE 0
19
20 /*
21 * Even though we connect cpus to numa domains later in SMP
22 * init, we need to know the node ids now for all cpus.
23 */
of_numa_parse_cpu_nodes(void)24 static void __init of_numa_parse_cpu_nodes(void)
25 {
26 u32 nid;
27 int r;
28 struct device_node *np;
29
30 for_each_of_cpu_node(np) {
31 r = of_property_read_u32(np, "numa-node-id", &nid);
32 if (r)
33 continue;
34
35 pr_debug("CPU on %u\n", nid);
36 if (nid >= MAX_NUMNODES)
37 pr_warn("Node id %u exceeds maximum value\n", nid);
38 else
39 node_set(nid, numa_nodes_parsed);
40 }
41 }
42
of_numa_parse_memory_nodes(void)43 static int __init of_numa_parse_memory_nodes(void)
44 {
45 struct device_node *np = NULL;
46 struct resource rsrc;
47 u32 nid;
48 int i, r = -EINVAL;
49
50 for_each_node_by_type(np, "memory") {
51 r = of_property_read_u32(np, "numa-node-id", &nid);
52 if (r == -EINVAL)
53 /*
54 * property doesn't exist if -EINVAL, continue
55 * looking for more memory nodes with
56 * "numa-node-id" property
57 */
58 continue;
59
60 if (nid >= MAX_NUMNODES) {
61 pr_warn("Node id %u exceeds maximum value\n", nid);
62 r = -EINVAL;
63 }
64
65 for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++) {
66 r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1);
67 if (!r)
68 node_set(nid, numa_nodes_parsed);
69 }
70
71 if (!i || r) {
72 of_node_put(np);
73 pr_err("bad property in memory node\n");
74 return r ? : -EINVAL;
75 }
76 }
77
78 return r;
79 }
80
of_numa_parse_distance_map_v1(struct device_node * map)81 static int __init of_numa_parse_distance_map_v1(struct device_node *map)
82 {
83 const __be32 *matrix;
84 int entry_count;
85 int i;
86
87 pr_info("parsing numa-distance-map-v1\n");
88
89 matrix = of_get_property(map, "distance-matrix", NULL);
90 if (!matrix) {
91 pr_err("No distance-matrix property in distance-map\n");
92 return -EINVAL;
93 }
94
95 entry_count = of_property_count_u32_elems(map, "distance-matrix");
96 if (entry_count <= 0) {
97 pr_err("Invalid distance-matrix\n");
98 return -EINVAL;
99 }
100
101 for (i = 0; i + 2 < entry_count; i += 3) {
102 u32 nodea, nodeb, distance;
103
104 nodea = of_read_number(matrix, 1);
105 matrix++;
106 nodeb = of_read_number(matrix, 1);
107 matrix++;
108 distance = of_read_number(matrix, 1);
109 matrix++;
110
111 if ((nodea == nodeb && distance != LOCAL_DISTANCE) ||
112 (nodea != nodeb && distance <= LOCAL_DISTANCE)) {
113 pr_err("Invalid distance[node%d -> node%d] = %d\n",
114 nodea, nodeb, distance);
115 return -EINVAL;
116 }
117
118 node_set(nodea, numa_nodes_parsed);
119
120 numa_set_distance(nodea, nodeb, distance);
121
122 /* Set default distance of node B->A same as A->B */
123 if (nodeb > nodea)
124 numa_set_distance(nodeb, nodea, distance);
125 }
126
127 return 0;
128 }
129
of_numa_parse_distance_map(void)130 static int __init of_numa_parse_distance_map(void)
131 {
132 int ret = 0;
133 struct device_node *np;
134
135 np = of_find_compatible_node(NULL, NULL,
136 "numa-distance-map-v1");
137 if (np)
138 ret = of_numa_parse_distance_map_v1(np);
139
140 of_node_put(np);
141 return ret;
142 }
143
of_node_to_nid(struct device_node * device)144 int of_node_to_nid(struct device_node *device)
145 {
146 struct device_node *np;
147 u32 nid;
148 int r = -ENODATA;
149
150 np = of_node_get(device);
151
152 while (np) {
153 r = of_property_read_u32(np, "numa-node-id", &nid);
154 /*
155 * -EINVAL indicates the property was not found, and
156 * we walk up the tree trying to find a parent with a
157 * "numa-node-id". Any other type of error indicates
158 * a bad device tree and we give up.
159 */
160 if (r != -EINVAL)
161 break;
162
163 np = of_get_next_parent(np);
164 }
165 if (np && r)
166 pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n",
167 np);
168 of_node_put(np);
169
170 /*
171 * If numa=off passed on command line, or with a defective
172 * device tree, the nid may not be in the set of possible
173 * nodes. Check for this case and return NUMA_NO_NODE.
174 */
175 if (!r && nid < MAX_NUMNODES && node_possible(nid))
176 return nid;
177
178 return NUMA_NO_NODE;
179 }
180
of_numa_init(void)181 int __init of_numa_init(void)
182 {
183 int r;
184
185 of_numa_parse_cpu_nodes();
186 r = of_numa_parse_memory_nodes();
187 if (r)
188 return r;
189 return of_numa_parse_distance_map();
190 }
191