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 }