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 /* define default numa node to 0 */
  18 #define DEFAULT_NODE 0
  19
  20 /*
  21  * Even though we connect cpus to numa domains later in SMP
  22  * init, we need to know the node ids now for all cpus.
  23 */
  24 static void __init of_numa_parse_cpu_nodes(void)
  25 {
  26         u32 nid;
  27         int r;
  28         struct device_node *np;
  29
  30         for_each_of_cpu_node(np) {
  31                 r = of_property_read_u32(np, "numa-node-id", &nid);
  32                 if (r)
  33                         continue;
  34
  35                 pr_debug("CPU on %u\n", nid);
  36                 if (nid >= MAX_NUMNODES)
  37                         pr_warn("Node id %u exceeds maximum value\n", nid);
  38                 else
  39                         node_set(nid, numa_nodes_parsed);
  40         }
  41 }
  42
  43 static int __init of_numa_parse_memory_nodes(void)
  44 {
  45         struct device_node *np = NULL;
  46         struct resource rsrc;
  47         u32 nid;
  48         int i, r = -EINVAL;
  49
  50         for_each_node_by_type(np, "memory") {
  51                 r = of_property_read_u32(np, "numa-node-id", &nid);
  52                 if (r == -EINVAL)
  53                         /*
  54                          * property doesn't exist if -EINVAL, continue
  55                          * looking for more memory nodes with
  56                          * "numa-node-id" property
  57                          */
  58                         continue;
  59
  60                 if (nid >= MAX_NUMNODES) {
  61                         pr_warn("Node id %u exceeds maximum value\n", nid);
  62                         r = -EINVAL;
  63                 }
  64
  65                 for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++)
  66                         r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1);
  67
  68                 if (!i || r) {
  69                         of_node_put(np);
  70                         pr_err("bad property in memory node\n");
  71                         return r ? : -EINVAL;
  72                 }
  73         }
  74
  75         return r;
  76 }
  77
  78 static int __init of_numa_parse_distance_map_v1(struct device_node *map)
  79 {
  80         const __be32 *matrix;
  81         int entry_count;
  82         int i;
  83
  84         pr_info("parsing numa-distance-map-v1\n");
  85
  86         matrix = of_get_property(map, "distance-matrix", NULL);
  87         if (!matrix) {
  88                 pr_err("No distance-matrix property in distance-map\n");
  89                 return -EINVAL;
  90         }
  91
  92         entry_count = of_property_count_u32_elems(map, "distance-matrix");
  93         if (entry_count <= 0) {
  94                 pr_err("Invalid distance-matrix\n");
  95                 return -EINVAL;
  96         }
  97
  98         for (i = 0; i + 2 < entry_count; i += 3) {
  99                 u32 nodea, nodeb, distance;
 100
 101                 nodea = of_read_number(matrix, 1);
 102                 matrix++;
 103                 nodeb = of_read_number(matrix, 1);
 104                 matrix++;
 105                 distance = of_read_number(matrix, 1);
 106                 matrix++;
 107
 108                 if ((nodea == nodeb && distance != LOCAL_DISTANCE) ||
 109                     (nodea != nodeb && distance <= LOCAL_DISTANCE)) {
 110                         pr_err("Invalid distance[node%d -> node%d] = %d\n",
 111                                nodea, nodeb, distance);
 112                         return -EINVAL;
 113                 }
 114
 115                 node_set(nodea, numa_nodes_parsed);
 116
 117                 numa_set_distance(nodea, nodeb, distance);
 118
 119                 /* Set default distance of node B->A same as A->B */
 120                 if (nodeb > nodea)
 121                         numa_set_distance(nodeb, nodea, distance);
 122         }
 123
 124         return 0;
 125 }
 126
 127 static int __init of_numa_parse_distance_map(void)
 128 {
 129         int ret = 0;
 130         struct device_node *np;
 131
 132         np = of_find_compatible_node(NULL, NULL,
 133                                      "numa-distance-map-v1");
 134         if (np)
 135                 ret = of_numa_parse_distance_map_v1(np);
 136
 137         of_node_put(np);
 138         return ret;
 139 }
 140
 141 int of_node_to_nid(struct device_node *device)
 142 {
 143         struct device_node *np;
 144         u32 nid;
 145         int r = -ENODATA;
 146
 147         np = of_node_get(device);
 148
 149         while (np) {
 150                 r = of_property_read_u32(np, "numa-node-id", &nid);
 151                 /*
 152                  * -EINVAL indicates the property was not found, and
 153                  *  we walk up the tree trying to find a parent with a
 154                  *  "numa-node-id".  Any other type of error indicates
 155                  *  a bad device tree and we give up.
 156                  */
 157                 if (r != -EINVAL)
 158                         break;
 159
 160                 np = of_get_next_parent(np);
 161         }
 162         if (np && r)
 163                 pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n",
 164                         np);
 165         of_node_put(np);
 166
 167         /*
 168          * If numa=off passed on command line, or with a defective
 169          * device tree, the nid may not be in the set of possible
 170          * nodes.  Check for this case and return NUMA_NO_NODE.
 171          */
 172         if (!r && nid < MAX_NUMNODES && node_possible(nid))
 173                 return nid;
 174
 175         return NUMA_NO_NODE;
 176 }
 177
 178 int __init of_numa_init(void)
 179 {
 180         int r;
 181
 182         of_numa_parse_cpu_nodes();
 183         r = of_numa_parse_memory_nodes();
 184         if (r)
 185                 return r;
 186         return of_numa_parse_distance_map();
 187 }