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// SPDX-License-Identifier: GPL-2.0
/*
* OF NUMA Parsing support.
*
* Copyright (C) 2015 - 2016 Cavium Inc.
*/
#define pr_fmt(fmt) "OF: NUMA: " fmt
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/nodemask.h>
#include <asm/numa.h>
/* define default numa node to 0 */
#define DEFAULT_NODE 0
/*
* Even though we connect cpus to numa domains later in SMP
* init, we need to know the node ids now for all cpus.
*/
static void __init of_numa_parse_cpu_nodes(void)
{
u32 nid;
int r;
struct device_node *cpus;
struct device_node *np = NULL;
cpus = of_find_node_by_path("/cpus");
if (!cpus)
return;
for_each_child_of_node(cpus, np) {
/* Skip things that are not CPUs */
if (of_node_cmp(np->type, "cpu") != 0)
continue;
r = of_property_read_u32(np, "numa-node-id", &nid);
if (r)
continue;
pr_debug("CPU on %u\n", nid);
if (nid >= MAX_NUMNODES)
pr_warn("Node id %u exceeds maximum value\n", nid);
else
node_set(nid, numa_nodes_parsed);
}
of_node_put(cpus);
}
static int __init of_numa_parse_memory_nodes(void)
{
struct device_node *np = NULL;
struct resource rsrc;
u32 nid;
int i, r;
for_each_node_by_type(np, "memory") {
r = of_property_read_u32(np, "numa-node-id", &nid);
if (r == -EINVAL)
/*
* property doesn't exist if -EINVAL, continue
* looking for more memory nodes with
* "numa-node-id" property
*/
continue;
if (nid >= MAX_NUMNODES) {
pr_warn("Node id %u exceeds maximum value\n", nid);
r = -EINVAL;
}
for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++)
r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1);
if (!i || r) {
of_node_put(np);
pr_err("bad property in memory node\n");
return r ? : -EINVAL;
}
}
return 0;
}
static int __init of_numa_parse_distance_map_v1(struct device_node *map)
{
const __be32 *matrix;
int entry_count;
int i;
pr_info("parsing numa-distance-map-v1\n");
matrix = of_get_property(map, "distance-matrix", NULL);
if (!matrix) {
pr_err("No distance-matrix property in distance-map\n");
return -EINVAL;
}
entry_count = of_property_count_u32_elems(map, "distance-matrix");
if (entry_count <= 0) {
pr_err("Invalid distance-matrix\n");
return -EINVAL;
}
for (i = 0; i + 2 < entry_count; i += 3) {
u32 nodea, nodeb, distance;
nodea = of_read_number(matrix, 1);
matrix++;
nodeb = of_read_number(matrix, 1);
matrix++;
distance = of_read_number(matrix, 1);
matrix++;
numa_set_distance(nodea, nodeb, distance);
pr_debug("distance[node%d -> node%d] = %d\n",
nodea, nodeb, distance);
/* Set default distance of node B->A same as A->B */
if (nodeb > nodea)
numa_set_distance(nodeb, nodea, distance);
}
return 0;
}
static int __init of_numa_parse_distance_map(void)
{
int ret = 0;
struct device_node *np;
np = of_find_compatible_node(NULL, NULL,
"numa-distance-map-v1");
if (np)
ret = of_numa_parse_distance_map_v1(np);
of_node_put(np);
return ret;
}
int of_node_to_nid(struct device_node *device)
{
struct device_node *np;
u32 nid;
int r = -ENODATA;
np = of_node_get(device);
while (np) {
r = of_property_read_u32(np, "numa-node-id", &nid);
/*
* -EINVAL indicates the property was not found, and
* we walk up the tree trying to find a parent with a
* "numa-node-id". Any other type of error indicates
* a bad device tree and we give up.
*/
if (r != -EINVAL)
break;
np = of_get_next_parent(np);
}
if (np && r)
pr_warn("Invalid \"numa-node-id\" property in node %s\n",
np->name);
of_node_put(np);
/*
* If numa=off passed on command line, or with a defective
* device tree, the nid may not be in the set of possible
* nodes. Check for this case and return NUMA_NO_NODE.
*/
if (!r && nid < MAX_NUMNODES && node_possible(nid))
return nid;
return NUMA_NO_NODE;
}
int __init of_numa_init(void)
{
int r;
of_numa_parse_cpu_nodes();
r = of_numa_parse_memory_nodes();
if (r)
return r;
return of_numa_parse_distance_map();
}
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