2016-04-09 00:50:25 +02:00
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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2016-09-01 08:54:58 +02:00
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#define pr_fmt(fmt) "OF: NUMA: " fmt
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2016-04-09 00:50:25 +02:00
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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 *cpus;
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struct device_node *np = NULL;
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cpus = of_find_node_by_path("/cpus");
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if (!cpus)
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return;
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for_each_child_of_node(cpus, np) {
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/* Skip things that are not CPUs */
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if (of_node_cmp(np->type, "cpu") != 0)
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continue;
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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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2016-09-01 08:54:58 +02:00
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pr_debug("CPU on %u\n", nid);
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2016-04-09 00:50:25 +02:00
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if (nid >= MAX_NUMNODES)
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2016-09-01 08:54:58 +02:00
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pr_warn("Node id %u exceeds maximum value\n", nid);
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2016-04-09 00:50:25 +02:00
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else
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node_set(nid, numa_nodes_parsed);
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}
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2017-04-18 02:29:17 +02:00
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of_node_put(cpus);
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2016-04-09 00:50:25 +02:00
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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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2016-09-01 08:54:53 +02:00
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int i, r;
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2016-04-09 00:50:25 +02:00
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2016-09-01 08:54:53 +02:00
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for_each_node_by_type(np, "memory") {
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2016-04-09 00:50:25 +02:00
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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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2016-09-01 08:54:54 +02:00
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if (nid >= MAX_NUMNODES) {
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2016-09-01 08:54:58 +02:00
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pr_warn("Node id %u exceeds maximum value\n", nid);
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2016-09-01 08:54:54 +02:00
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r = -EINVAL;
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}
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2016-09-01 08:54:53 +02:00
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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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2016-09-01 08:54:58 +02:00
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pr_err("bad property in memory node\n");
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2016-09-01 08:54:53 +02:00
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return r ? : -EINVAL;
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}
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2016-04-09 00:50:25 +02:00
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}
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2016-09-01 08:54:53 +02:00
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return 0;
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2016-04-09 00:50:25 +02:00
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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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2016-09-01 08:54:58 +02:00
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pr_info("parsing numa-distance-map-v1\n");
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2016-04-09 00:50:25 +02:00
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matrix = of_get_property(map, "distance-matrix", NULL);
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if (!matrix) {
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2016-09-01 08:54:58 +02:00
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pr_err("No distance-matrix property in distance-map\n");
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2016-04-09 00:50:25 +02:00
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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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2016-09-01 08:54:58 +02:00
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pr_err("Invalid distance-matrix\n");
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2016-04-09 00:50:25 +02:00
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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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numa_set_distance(nodea, nodeb, distance);
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2016-09-01 08:54:58 +02:00
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pr_debug("distance[node%d -> node%d] = %d\n",
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2016-04-09 00:50:25 +02:00
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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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2016-09-01 08:54:57 +02:00
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np = of_get_next_parent(np);
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2016-04-09 00:50:25 +02:00
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}
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if (np && r)
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2016-09-01 08:54:58 +02:00
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pr_warn("Invalid \"numa-node-id\" property in node %s\n",
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2016-04-09 00:50:25 +02:00
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np->name);
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of_node_put(np);
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of, numa: Return NUMA_NO_NODE from disable of_node_to_nid() if nid not possible.
On arm64 NUMA kernels we can pass "numa=off" on the command line to
disable NUMA. A side effect of this is that kmalloc_node() calls to
non-zero nodes will crash the system with an OOPS:
[ 0.000000] ITS@0x0000901000020000: allocated 2097152 Devices @10002000000 (flat, esz 8, psz 64K, shr 1)
[ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 00001680
[ 0.000000] pgd = fffffc0009470000
[ 0.000000] [00001680] *pgd=0000010ffff90003, *pud=0000010ffff90003, *pmd=0000010ffff90003, *pte=0000000000000000
[ 0.000000] Internal error: Oops: 96000006 [#1] SMP
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[ 0.000000] [<fffffc00081c8950>] __alloc_pages_nodemask+0xa4/0xe68
[ 0.000000] [<fffffc000821fa70>] new_slab+0xd0/0x564
[ 0.000000] [<fffffc0008221e24>] ___slab_alloc+0x2e4/0x514
[ 0.000000] [<fffffc0008239498>] __slab_alloc+0x48/0x58
[ 0.000000] [<fffffc0008222c20>] __kmalloc_node+0xd0/0x2dc
[ 0.000000] [<fffffc0008115374>] __irq_domain_add+0x7c/0x164
[ 0.000000] [<fffffc0008b461dc>] its_probe+0x784/0x81c
[ 0.000000] [<fffffc0008b462bc>] its_init+0x48/0x1b0
[ 0.000000] [<fffffc0008b4543c>] gic_init_bases+0x228/0x360
[ 0.000000] [<fffffc0008b456bc>] gic_of_init+0x148/0x1cc
[ 0.000000] [<fffffc0008b5aec8>] of_irq_init+0x184/0x298
[ 0.000000] [<fffffc0008b43f9c>] irqchip_init+0x14/0x38
[ 0.000000] [<fffffc0008b12d60>] init_IRQ+0xc/0x30
[ 0.000000] [<fffffc0008b10a3c>] start_kernel+0x240/0x3b8
[ 0.000000] [<fffffc0008b101c4>] __primary_switched+0x30/0x6c
[ 0.000000] Code: 912ec2a0 b9403809 0a0902fb 37b007db (f9400300)
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This is caused by code like this in kernel/irq/irqdomain.c
domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
GFP_KERNEL, of_node_to_nid(of_node));
When NUMA is disabled, the concept of a node is really undefined, so
of_node_to_nid() should unconditionally return NUMA_NO_NODE.
Fix by returning NUMA_NO_NODE when the nid is not in the set of
possible nodes.
Reported-by: Gilbert Netzer <noname@pdc.kth.se>
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: stable@vger.kernel.org # 4.7+
Signed-off-by: Rob Herring <robh@kernel.org>
2016-10-28 23:15:02 +02:00
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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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2016-09-01 08:54:55 +02:00
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return nid;
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2016-04-09 00:50:25 +02:00
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return NUMA_NO_NODE;
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}
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EXPORT_SYMBOL(of_node_to_nid);
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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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