]> Git Repo - J-linux.git/blob - drivers/of/of_numa.c
Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / drivers / of / of_numa.c
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 /*
18  * Even though we connect cpus to numa domains later in SMP
19  * init, we need to know the node ids now for all cpus.
20 */
21 static void __init of_numa_parse_cpu_nodes(void)
22 {
23         u32 nid;
24         int r;
25         struct device_node *np;
26
27         for_each_of_cpu_node(np) {
28                 r = of_property_read_u32(np, "numa-node-id", &nid);
29                 if (r)
30                         continue;
31
32                 pr_debug("CPU on %u\n", nid);
33                 if (nid >= MAX_NUMNODES)
34                         pr_warn("Node id %u exceeds maximum value\n", nid);
35                 else
36                         node_set(nid, numa_nodes_parsed);
37         }
38 }
39
40 static int __init of_numa_parse_memory_nodes(void)
41 {
42         struct device_node *np = NULL;
43         struct resource rsrc;
44         u32 nid;
45         int i, r = -EINVAL;
46
47         for_each_node_by_type(np, "memory") {
48                 r = of_property_read_u32(np, "numa-node-id", &nid);
49                 if (r == -EINVAL)
50                         /*
51                          * property doesn't exist if -EINVAL, continue
52                          * looking for more memory nodes with
53                          * "numa-node-id" property
54                          */
55                         continue;
56
57                 if (nid >= MAX_NUMNODES) {
58                         pr_warn("Node id %u exceeds maximum value\n", nid);
59                         r = -EINVAL;
60                 }
61
62                 for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++)
63                         r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1);
64
65                 if (!i || r) {
66                         of_node_put(np);
67                         pr_err("bad property in memory node\n");
68                         return r ? : -EINVAL;
69                 }
70         }
71
72         return r;
73 }
74
75 static int __init of_numa_parse_distance_map_v1(struct device_node *map)
76 {
77         const __be32 *matrix;
78         int entry_count;
79         int i;
80
81         pr_info("parsing numa-distance-map-v1\n");
82
83         matrix = of_get_property(map, "distance-matrix", NULL);
84         if (!matrix) {
85                 pr_err("No distance-matrix property in distance-map\n");
86                 return -EINVAL;
87         }
88
89         entry_count = of_property_count_u32_elems(map, "distance-matrix");
90         if (entry_count <= 0) {
91                 pr_err("Invalid distance-matrix\n");
92                 return -EINVAL;
93         }
94
95         for (i = 0; i + 2 < entry_count; i += 3) {
96                 u32 nodea, nodeb, distance;
97
98                 nodea = of_read_number(matrix, 1);
99                 matrix++;
100                 nodeb = of_read_number(matrix, 1);
101                 matrix++;
102                 distance = of_read_number(matrix, 1);
103                 matrix++;
104
105                 if ((nodea == nodeb && distance != LOCAL_DISTANCE) ||
106                     (nodea != nodeb && distance <= LOCAL_DISTANCE)) {
107                         pr_err("Invalid distance[node%d -> node%d] = %d\n",
108                                nodea, nodeb, distance);
109                         return -EINVAL;
110                 }
111
112                 node_set(nodea, numa_nodes_parsed);
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
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
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
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 }
This page took 0.035294 seconds and 4 git commands to generate.