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![Gavin Shan](/assets/img/avatar_default.png)
There is no device node for the empty NUMA node. However, the corresponding NUMA node ID and distance map is still valid in "numa-distance-map-v1" compatible device node. This fetches the NUMA node ID and distance map for these empty NUMA node from "numa-distance-map-v1" compatible device node. Signed-off-by: Gavin Shan <gshan@redhat.com> Link: https://lore.kernel.org/r/20210927064119.127285-3-gshan@redhat.com Signed-off-by: Rob Herring <robh@kernel.org>
186 lines
3.9 KiB
C
186 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* OF NUMA Parsing support.
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*
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* Copyright (C) 2015 - 2016 Cavium Inc.
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*/
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#define pr_fmt(fmt) "OF: NUMA: " fmt
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/nodemask.h>
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#include <asm/numa.h>
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/* define default numa node to 0 */
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#define DEFAULT_NODE 0
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/*
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* Even though we connect cpus to numa domains later in SMP
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* init, we need to know the node ids now for all cpus.
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*/
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static void __init of_numa_parse_cpu_nodes(void)
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{
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u32 nid;
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int r;
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struct device_node *np;
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for_each_of_cpu_node(np) {
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r = of_property_read_u32(np, "numa-node-id", &nid);
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if (r)
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continue;
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pr_debug("CPU on %u\n", nid);
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if (nid >= MAX_NUMNODES)
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pr_warn("Node id %u exceeds maximum value\n", nid);
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else
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node_set(nid, numa_nodes_parsed);
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}
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}
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static int __init of_numa_parse_memory_nodes(void)
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{
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struct device_node *np = NULL;
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struct resource rsrc;
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u32 nid;
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int i, r;
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for_each_node_by_type(np, "memory") {
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r = of_property_read_u32(np, "numa-node-id", &nid);
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if (r == -EINVAL)
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/*
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* property doesn't exist if -EINVAL, continue
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* looking for more memory nodes with
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* "numa-node-id" property
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*/
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continue;
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if (nid >= MAX_NUMNODES) {
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pr_warn("Node id %u exceeds maximum value\n", nid);
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r = -EINVAL;
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}
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for (i = 0; !r && !of_address_to_resource(np, i, &rsrc); i++)
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r = numa_add_memblk(nid, rsrc.start, rsrc.end + 1);
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if (!i || r) {
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of_node_put(np);
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pr_err("bad property in memory node\n");
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return r ? : -EINVAL;
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}
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}
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return 0;
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}
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static int __init of_numa_parse_distance_map_v1(struct device_node *map)
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{
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const __be32 *matrix;
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int entry_count;
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int i;
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pr_info("parsing numa-distance-map-v1\n");
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matrix = of_get_property(map, "distance-matrix", NULL);
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if (!matrix) {
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pr_err("No distance-matrix property in distance-map\n");
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return -EINVAL;
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}
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entry_count = of_property_count_u32_elems(map, "distance-matrix");
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if (entry_count <= 0) {
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pr_err("Invalid distance-matrix\n");
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return -EINVAL;
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}
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for (i = 0; i + 2 < entry_count; i += 3) {
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u32 nodea, nodeb, distance;
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nodea = of_read_number(matrix, 1);
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matrix++;
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nodeb = of_read_number(matrix, 1);
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matrix++;
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distance = of_read_number(matrix, 1);
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matrix++;
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if ((nodea == nodeb && distance != LOCAL_DISTANCE) ||
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(nodea != nodeb && distance <= LOCAL_DISTANCE)) {
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pr_err("Invalid distance[node%d -> node%d] = %d\n",
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nodea, nodeb, distance);
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return -EINVAL;
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}
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node_set(nodea, numa_nodes_parsed);
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numa_set_distance(nodea, nodeb, distance);
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/* Set default distance of node B->A same as A->B */
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if (nodeb > nodea)
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numa_set_distance(nodeb, nodea, distance);
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}
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return 0;
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}
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static int __init of_numa_parse_distance_map(void)
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{
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int ret = 0;
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struct device_node *np;
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np = of_find_compatible_node(NULL, NULL,
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"numa-distance-map-v1");
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if (np)
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ret = of_numa_parse_distance_map_v1(np);
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of_node_put(np);
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return ret;
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}
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int of_node_to_nid(struct device_node *device)
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{
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struct device_node *np;
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u32 nid;
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int r = -ENODATA;
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np = of_node_get(device);
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while (np) {
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r = of_property_read_u32(np, "numa-node-id", &nid);
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/*
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* -EINVAL indicates the property was not found, and
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* we walk up the tree trying to find a parent with a
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* "numa-node-id". Any other type of error indicates
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* a bad device tree and we give up.
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*/
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if (r != -EINVAL)
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break;
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np = of_get_next_parent(np);
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}
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if (np && r)
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pr_warn("Invalid \"numa-node-id\" property in node %pOFn\n",
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np);
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of_node_put(np);
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/*
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* If numa=off passed on command line, or with a defective
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* device tree, the nid may not be in the set of possible
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* nodes. Check for this case and return NUMA_NO_NODE.
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*/
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if (!r && nid < MAX_NUMNODES && node_possible(nid))
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return nid;
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return NUMA_NO_NODE;
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}
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int __init of_numa_init(void)
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{
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int r;
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of_numa_parse_cpu_nodes();
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r = of_numa_parse_memory_nodes();
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if (r)
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return r;
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return of_numa_parse_distance_map();
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}
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