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
68 if (!i || r) {
69 of_node_put(np);
70 pr_err("bad property in memory node\n");
71 return r ? : -EINVAL;
72 }
73 }
74
75 return r;
76 }
77
of_numa_parse_distance_map_v1(struct device_node * map)78 static int __init of_numa_parse_distance_map_v1(struct device_node *map)
79 {
80 const __be32 *matrix;
81 int entry_count;
82 int i;
83
84 pr_info("parsing numa-distance-map-v1\n");
85
86 matrix = of_get_property(map, "distance-matrix", NULL);
87 if (!matrix) {
88 pr_err("No distance-matrix property in distance-map\n");
89 return -EINVAL;
90 }
91
92 entry_count = of_property_count_u32_elems(map, "distance-matrix");
93 if (entry_count <= 0) {
94 pr_err("Invalid distance-matrix\n");
95 return -EINVAL;
96 }
97
98 for (i = 0; i + 2 < entry_count; i += 3) {
99 u32 nodea, nodeb, distance;
100
101 nodea = of_read_number(matrix, 1);
102 matrix++;
103 nodeb = of_read_number(matrix, 1);
104 matrix++;
105 distance = of_read_number(matrix, 1);
106 matrix++;
107
108 if ((nodea == nodeb && distance != LOCAL_DISTANCE) ||
109 (nodea != nodeb && distance <= LOCAL_DISTANCE)) {
110 pr_err("Invalid distance[node%d -> node%d] = %d\n",
111 nodea, nodeb, distance);
112 return -EINVAL;
113 }
114
115 node_set(nodea, numa_nodes_parsed);
116
117 numa_set_distance(nodea, nodeb, distance);
118
119 /* Set default distance of node B->A same as A->B */
120 if (nodeb > nodea)
121 numa_set_distance(nodeb, nodea, distance);
122 }
123
124 return 0;
125 }
126
of_numa_parse_distance_map(void)127 static int __init of_numa_parse_distance_map(void)
128 {
129 int ret = 0;
130 struct device_node *np;
131
132 np = of_find_compatible_node(NULL, NULL,
133 "numa-distance-map-v1");
134 if (np)
135 ret = of_numa_parse_distance_map_v1(np);
136
137 of_node_put(np);
138 return ret;
139 }
140
of_node_to_nid(struct device_node * device)141 int of_node_to_nid(struct device_node *device)
142 {
143 struct device_node *np;
144 u32 nid;
145 int r = -ENODATA;
146
147 np = of_node_get(device);
148
149 while (np) {
150 r = of_property_read_u32(np, "numa-node-id", &nid);
151 /*
152 * -EINVAL indicates the property was not found, and
153 * we walk up the tree trying to find a parent with a
154 * "numa-node-id". Any other type of error indicates
155 * a bad device tree and we give up.
156 */
157 if (r != -EINVAL)
158 break;
159
160 np = of_get_next_parent(np);
161 }
162 if (np && r)
163 pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n",
164 np);
165 of_node_put(np);
166
167 /*
168 * If numa=off passed on command line, or with a defective
169 * device tree, the nid may not be in the set of possible
170 * nodes. Check for this case and return NUMA_NO_NODE.
171 */
172 if (!r && nid < MAX_NUMNODES && node_possible(nid))
173 return nid;
174
175 return NUMA_NO_NODE;
176 }
177
of_numa_init(void)178 int __init of_numa_init(void)
179 {
180 int r;
181
182 of_numa_parse_cpu_nodes();
183 r = of_numa_parse_memory_nodes();
184 if (r)
185 return r;
186 return of_numa_parse_distance_map();
187 }
188