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
14 #include <asm/numa.h>
15
16 /* define default numa node to 0 */
17 #define DEFAULT_NODE 0
18
19 /*
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.
22 */
of_numa_parse_cpu_nodes(void)23 static void __init of_numa_parse_cpu_nodes(void)
24 {
25 u32 nid;
26 int r;
27 struct device_node *np;
28
29 for_each_of_cpu_node(np) {
30 r = of_property_read_u32(np, "numa-node-id", &nid);
31 if (r)
32 continue;
33
34 pr_debug("CPU on %u\n", nid);
35 if (nid >= MAX_NUMNODES)
36 pr_warn("Node id %u exceeds maximum value\n", nid);
37 else
38 node_set(nid, numa_nodes_parsed);
39 }
40 }
41
of_numa_parse_memory_nodes(void)42 static int __init of_numa_parse_memory_nodes(void)
43 {
44 struct device_node *np = NULL;
45 struct resource rsrc;
46 u32 nid;
47 int i, r;
48
49 for_each_node_by_type(np, "memory") {
50 r = of_property_read_u32(np, "numa-node-id", &nid);
51 if (r == -EINVAL)
52 /*
53 * property doesn't exist if -EINVAL, continue
54 * looking for more memory nodes with
55 * "numa-node-id" property
56 */
57 continue;
58
59 if (nid >= MAX_NUMNODES) {
60 pr_warn("Node id %u exceeds maximum value\n", nid);
61 r = -EINVAL;
62 }
63
64 for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++)
65 r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1);
66
67 if (!i || r) {
68 of_node_put(np);
69 pr_err("bad property in memory node\n");
70 return r ? : -EINVAL;
71 }
72 }
73
74 return 0;
75 }
76
of_numa_parse_distance_map_v1(struct device_node * map)77 static int __init of_numa_parse_distance_map_v1(struct device_node *map)
78 {
79 const __be32 *matrix;
80 int entry_count;
81 int i;
82
83 pr_info("parsing numa-distance-map-v1\n");
84
85 matrix = of_get_property(map, "distance-matrix", NULL);
86 if (!matrix) {
87 pr_err("No distance-matrix property in distance-map\n");
88 return -EINVAL;
89 }
90
91 entry_count = of_property_count_u32_elems(map, "distance-matrix");
92 if (entry_count <= 0) {
93 pr_err("Invalid distance-matrix\n");
94 return -EINVAL;
95 }
96
97 for (i = 0; i + 2 < entry_count; i += 3) {
98 u32 nodea, nodeb, distance;
99
100 nodea = of_read_number(matrix, 1);
101 matrix++;
102 nodeb = of_read_number(matrix, 1);
103 matrix++;
104 distance = of_read_number(matrix, 1);
105 matrix++;
106
107 if ((nodea == nodeb && distance != LOCAL_DISTANCE) ||
108 (nodea != nodeb && distance <= LOCAL_DISTANCE)) {
109 pr_err("Invalid distance[node%d -> node%d] = %d\n",
110 nodea, nodeb, distance);
111 return -EINVAL;
112 }
113
114 numa_set_distance(nodea, nodeb, distance);
115
116 /* Set default distance of node B->A same as A->B */
117 if (nodeb > nodea)
118 numa_set_distance(nodeb, nodea, distance);
119 }
120
121 return 0;
122 }
123
of_numa_parse_distance_map(void)124 static int __init of_numa_parse_distance_map(void)
125 {
126 int ret = 0;
127 struct device_node *np;
128
129 np = of_find_compatible_node(NULL, NULL,
130 "numa-distance-map-v1");
131 if (np)
132 ret = of_numa_parse_distance_map_v1(np);
133
134 of_node_put(np);
135 return ret;
136 }
137
of_node_to_nid(struct device_node * device)138 int of_node_to_nid(struct device_node *device)
139 {
140 struct device_node *np;
141 u32 nid;
142 int r = -ENODATA;
143
144 np = of_node_get(device);
145
146 while (np) {
147 r = of_property_read_u32(np, "numa-node-id", &nid);
148 /*
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.
153 */
154 if (r != -EINVAL)
155 break;
156
157 np = of_get_next_parent(np);
158 }
159 if (np && r)
160 pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n",
161 np);
162 of_node_put(np);
163
164 /*
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.
168 */
169 if (!r && nid < MAX_NUMNODES && node_possible(nid))
170 return nid;
171
172 return NUMA_NO_NODE;
173 }
174
of_numa_init(void)175 int __init of_numa_init(void)
176 {
177 int r;
178
179 of_numa_parse_cpu_nodes();
180 r = of_numa_parse_memory_nodes();
181 if (r)
182 return r;
183 return of_numa_parse_distance_map();
184 }
185