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
  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 */
  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
  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
  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                 numa_set_distance(nodea, nodeb, distance);
 108                 pr_debug("distance[node%d -> node%d] = %d\n",
 109                          nodea, nodeb, distance);
 110
 111                 /* Set default distance of node B->A same as A->B */
 112                 if (nodeb > nodea)
 113                         numa_set_distance(nodeb, nodea, distance);
 114         }
 115
 116         return 0;
 117 }
 118
 119 static int __init of_numa_parse_distance_map(void)
 120 {
 121         int ret = 0;
 122         struct device_node *np;
 123
 124         np = of_find_compatible_node(NULL, NULL,
 125                                      "numa-distance-map-v1");
 126         if (np)
 127                 ret = of_numa_parse_distance_map_v1(np);
 128
 129         of_node_put(np);
 130         return ret;
 131 }
 132
 133 int of_node_to_nid(struct device_node *device)
 134 {
 135         struct device_node *np;
 136         u32 nid;
 137         int r = -ENODATA;
 138
 139         np = of_node_get(device);
 140
 141         while (np) {
 142                 r = of_property_read_u32(np, "numa-node-id", &nid);
 143                 /*
 144                  * -EINVAL indicates the property was not found, and
 145                  *  we walk up the tree trying to find a parent with a
 146                  *  "numa-node-id".  Any other type of error indicates
 147                  *  a bad device tree and we give up.
 148                  */
 149                 if (r != -EINVAL)
 150                         break;
 151
 152                 np = of_get_next_parent(np);
 153         }
 154         if (np && r)
 155                 pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n",
 156                         np);
 157         of_node_put(np);
 158
 159         /*
 160          * If numa=off passed on command line, or with a defective
 161          * device tree, the nid may not be in the set of possible
 162          * nodes.  Check for this case and return NUMA_NO_NODE.
 163          */
 164         if (!r && nid < MAX_NUMNODES && node_possible(nid))
 165                 return nid;
 166
 167         return NUMA_NO_NODE;
 168 }
 169
 170 int __init of_numa_init(void)
 171 {
 172         int r;
 173
 174         of_numa_parse_cpu_nodes();
 175         r = of_numa_parse_memory_nodes();
 176         if (r)
 177                 return r;
 178         return of_numa_parse_distance_map();
 179 }