blob: 0f2784bc18742b44904d767f2d619f8042585f6f [file] [log] [blame]
David Daney298535c2016-04-08 15:50:25 -07001/*
2 * OF NUMA Parsing support.
3 *
4 * Copyright (C) 2015 - 2016 Cavium Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#include <linux/of.h>
20#include <linux/of_address.h>
21#include <linux/nodemask.h>
22
23#include <asm/numa.h>
24
25/* define default numa node to 0 */
26#define DEFAULT_NODE 0
27
28/*
29 * Even though we connect cpus to numa domains later in SMP
30 * init, we need to know the node ids now for all cpus.
31*/
32static void __init of_numa_parse_cpu_nodes(void)
33{
34 u32 nid;
35 int r;
36 struct device_node *cpus;
37 struct device_node *np = NULL;
38
39 cpus = of_find_node_by_path("/cpus");
40 if (!cpus)
41 return;
42
43 for_each_child_of_node(cpus, np) {
44 /* Skip things that are not CPUs */
45 if (of_node_cmp(np->type, "cpu") != 0)
46 continue;
47
48 r = of_property_read_u32(np, "numa-node-id", &nid);
49 if (r)
50 continue;
51
52 pr_debug("NUMA: CPU on %u\n", nid);
53 if (nid >= MAX_NUMNODES)
54 pr_warn("NUMA: Node id %u exceeds maximum value\n",
55 nid);
56 else
57 node_set(nid, numa_nodes_parsed);
58 }
59}
60
61static int __init of_numa_parse_memory_nodes(void)
62{
63 struct device_node *np = NULL;
64 struct resource rsrc;
65 u32 nid;
66 int r = 0;
67
68 for (;;) {
69 np = of_find_node_by_type(np, "memory");
70 if (!np)
71 break;
72
73 r = of_property_read_u32(np, "numa-node-id", &nid);
74 if (r == -EINVAL)
75 /*
76 * property doesn't exist if -EINVAL, continue
77 * looking for more memory nodes with
78 * "numa-node-id" property
79 */
80 continue;
81 else if (r)
82 /* some other error */
83 break;
84
85 r = of_address_to_resource(np, 0, &rsrc);
86 if (r) {
87 pr_err("NUMA: bad reg property in memory node\n");
88 break;
89 }
90
91 pr_debug("NUMA: base = %llx len = %llx, node = %u\n",
92 rsrc.start, rsrc.end - rsrc.start + 1, nid);
93
94 r = numa_add_memblk(nid, rsrc.start,
95 rsrc.end - rsrc.start + 1);
96 if (r)
97 break;
98 }
99 of_node_put(np);
100
101 return r;
102}
103
104static int __init of_numa_parse_distance_map_v1(struct device_node *map)
105{
106 const __be32 *matrix;
107 int entry_count;
108 int i;
109
110 pr_info("NUMA: parsing numa-distance-map-v1\n");
111
112 matrix = of_get_property(map, "distance-matrix", NULL);
113 if (!matrix) {
114 pr_err("NUMA: No distance-matrix property in distance-map\n");
115 return -EINVAL;
116 }
117
118 entry_count = of_property_count_u32_elems(map, "distance-matrix");
119 if (entry_count <= 0) {
120 pr_err("NUMA: Invalid distance-matrix\n");
121 return -EINVAL;
122 }
123
124 for (i = 0; i + 2 < entry_count; i += 3) {
125 u32 nodea, nodeb, distance;
126
127 nodea = of_read_number(matrix, 1);
128 matrix++;
129 nodeb = of_read_number(matrix, 1);
130 matrix++;
131 distance = of_read_number(matrix, 1);
132 matrix++;
133
134 numa_set_distance(nodea, nodeb, distance);
135 pr_debug("NUMA: distance[node%d -> node%d] = %d\n",
136 nodea, nodeb, distance);
137
138 /* Set default distance of node B->A same as A->B */
139 if (nodeb > nodea)
140 numa_set_distance(nodeb, nodea, distance);
141 }
142
143 return 0;
144}
145
146static int __init of_numa_parse_distance_map(void)
147{
148 int ret = 0;
149 struct device_node *np;
150
151 np = of_find_compatible_node(NULL, NULL,
152 "numa-distance-map-v1");
153 if (np)
154 ret = of_numa_parse_distance_map_v1(np);
155
156 of_node_put(np);
157 return ret;
158}
159
160int of_node_to_nid(struct device_node *device)
161{
162 struct device_node *np;
163 u32 nid;
164 int r = -ENODATA;
165
166 np = of_node_get(device);
167
168 while (np) {
169 struct device_node *parent;
170
171 r = of_property_read_u32(np, "numa-node-id", &nid);
172 /*
173 * -EINVAL indicates the property was not found, and
174 * we walk up the tree trying to find a parent with a
175 * "numa-node-id". Any other type of error indicates
176 * a bad device tree and we give up.
177 */
178 if (r != -EINVAL)
179 break;
180
181 parent = of_get_parent(np);
182 of_node_put(np);
183 np = parent;
184 }
185 if (np && r)
186 pr_warn("NUMA: Invalid \"numa-node-id\" property in node %s\n",
187 np->name);
188 of_node_put(np);
189
190 if (!r) {
191 if (nid >= MAX_NUMNODES)
192 pr_warn("NUMA: Node id %u exceeds maximum value\n",
193 nid);
194 else
195 return nid;
196 }
197
198 return NUMA_NO_NODE;
199}
200EXPORT_SYMBOL(of_node_to_nid);
201
202int __init of_numa_init(void)
203{
204 int r;
205
206 of_numa_parse_cpu_nodes();
207 r = of_numa_parse_memory_nodes();
208 if (r)
209 return r;
210 return of_numa_parse_distance_map();
211}