swh:1:snp:77163734605b0ec556b01d897b7bb4a7e30d46b6
Tip revision: 523d939ef98fd712632d93a5a2b588e477a7565e authored by Linus Torvalds on 24 July 2016, 19:23:50 UTC
Linux 4.7
Linux 4.7
Tip revision: 523d939
numa.c
/*
* NUMA support, based on the x86 implementation.
*
* Copyright (C) 2015 Cavium Inc.
* Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/module.h>
#include <linux/of.h>
struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);
nodemask_t numa_nodes_parsed __initdata;
static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
static int numa_distance_cnt;
static u8 *numa_distance;
static int numa_off;
static __init int numa_parse_early_param(char *opt)
{
if (!opt)
return -EINVAL;
if (!strncmp(opt, "off", 3)) {
pr_info("%s\n", "NUMA turned off");
numa_off = 1;
}
return 0;
}
early_param("numa", numa_parse_early_param);
cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
EXPORT_SYMBOL(node_to_cpumask_map);
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
/*
* Returns a pointer to the bitmask of CPUs on Node 'node'.
*/
const struct cpumask *cpumask_of_node(int node)
{
if (WARN_ON(node >= nr_node_ids))
return cpu_none_mask;
if (WARN_ON(node_to_cpumask_map[node] == NULL))
return cpu_online_mask;
return node_to_cpumask_map[node];
}
EXPORT_SYMBOL(cpumask_of_node);
#endif
static void map_cpu_to_node(unsigned int cpu, int nid)
{
set_cpu_numa_node(cpu, nid);
if (nid >= 0)
cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
}
void numa_clear_node(unsigned int cpu)
{
int nid = cpu_to_node(cpu);
if (nid >= 0)
cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
set_cpu_numa_node(cpu, NUMA_NO_NODE);
}
/*
* Allocate node_to_cpumask_map based on number of available nodes
* Requires node_possible_map to be valid.
*
* Note: cpumask_of_node() is not valid until after this is done.
* (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
*/
static void __init setup_node_to_cpumask_map(void)
{
unsigned int cpu;
int node;
/* setup nr_node_ids if not done yet */
if (nr_node_ids == MAX_NUMNODES)
setup_nr_node_ids();
/* allocate and clear the mapping */
for (node = 0; node < nr_node_ids; node++) {
alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
cpumask_clear(node_to_cpumask_map[node]);
}
for_each_possible_cpu(cpu)
set_cpu_numa_node(cpu, NUMA_NO_NODE);
/* cpumask_of_node() will now work */
pr_debug("NUMA: Node to cpumask map for %d nodes\n", nr_node_ids);
}
/*
* Set the cpu to node and mem mapping
*/
void numa_store_cpu_info(unsigned int cpu)
{
map_cpu_to_node(cpu, numa_off ? 0 : cpu_to_node_map[cpu]);
}
void __init early_map_cpu_to_node(unsigned int cpu, int nid)
{
/* fallback to node 0 */
if (nid < 0 || nid >= MAX_NUMNODES)
nid = 0;
cpu_to_node_map[cpu] = nid;
}
/**
* numa_add_memblk - Set node id to memblk
* @nid: NUMA node ID of the new memblk
* @start: Start address of the new memblk
* @size: Size of the new memblk
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int __init numa_add_memblk(int nid, u64 start, u64 size)
{
int ret;
ret = memblock_set_node(start, size, &memblock.memory, nid);
if (ret < 0) {
pr_err("NUMA: memblock [0x%llx - 0x%llx] failed to add on node %d\n",
start, (start + size - 1), nid);
return ret;
}
node_set(nid, numa_nodes_parsed);
pr_info("NUMA: Adding memblock [0x%llx - 0x%llx] on node %d\n",
start, (start + size - 1), nid);
return ret;
}
/**
* Initialize NODE_DATA for a node on the local memory
*/
static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
{
const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
u64 nd_pa;
void *nd;
int tnid;
pr_info("NUMA: Initmem setup node %d [mem %#010Lx-%#010Lx]\n",
nid, start_pfn << PAGE_SHIFT,
(end_pfn << PAGE_SHIFT) - 1);
nd_pa = memblock_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
nd = __va(nd_pa);
/* report and initialize */
pr_info("NUMA: NODE_DATA [mem %#010Lx-%#010Lx]\n",
nd_pa, nd_pa + nd_size - 1);
tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
if (tnid != nid)
pr_info("NUMA: NODE_DATA(%d) on node %d\n", nid, tnid);
node_data[nid] = nd;
memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
NODE_DATA(nid)->node_id = nid;
NODE_DATA(nid)->node_start_pfn = start_pfn;
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
}
/**
* numa_free_distance
*
* The current table is freed.
*/
void __init numa_free_distance(void)
{
size_t size;
if (!numa_distance)
return;
size = numa_distance_cnt * numa_distance_cnt *
sizeof(numa_distance[0]);
memblock_free(__pa(numa_distance), size);
numa_distance_cnt = 0;
numa_distance = NULL;
}
/**
*
* Create a new NUMA distance table.
*
*/
static int __init numa_alloc_distance(void)
{
size_t size;
u64 phys;
int i, j;
size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
size, PAGE_SIZE);
if (WARN_ON(!phys))
return -ENOMEM;
memblock_reserve(phys, size);
numa_distance = __va(phys);
numa_distance_cnt = nr_node_ids;
/* fill with the default distances */
for (i = 0; i < numa_distance_cnt; i++)
for (j = 0; j < numa_distance_cnt; j++)
numa_distance[i * numa_distance_cnt + j] = i == j ?
LOCAL_DISTANCE : REMOTE_DISTANCE;
pr_debug("NUMA: Initialized distance table, cnt=%d\n",
numa_distance_cnt);
return 0;
}
/**
* numa_set_distance - Set inter node NUMA distance from node to node.
* @from: the 'from' node to set distance
* @to: the 'to' node to set distance
* @distance: NUMA distance
*
* Set the distance from node @from to @to to @distance.
* If distance table doesn't exist, a warning is printed.
*
* If @from or @to is higher than the highest known node or lower than zero
* or @distance doesn't make sense, the call is ignored.
*
*/
void __init numa_set_distance(int from, int to, int distance)
{
if (!numa_distance) {
pr_warn_once("NUMA: Warning: distance table not allocated yet\n");
return;
}
if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
from < 0 || to < 0) {
pr_warn_once("NUMA: Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
from, to, distance);
return;
}
if ((u8)distance != distance ||
(from == to && distance != LOCAL_DISTANCE)) {
pr_warn_once("NUMA: Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
from, to, distance);
return;
}
numa_distance[from * numa_distance_cnt + to] = distance;
}
/**
* Return NUMA distance @from to @to
*/
int __node_distance(int from, int to)
{
if (from >= numa_distance_cnt || to >= numa_distance_cnt)
return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
return numa_distance[from * numa_distance_cnt + to];
}
EXPORT_SYMBOL(__node_distance);
static int __init numa_register_nodes(void)
{
int nid;
struct memblock_region *mblk;
/* Check that valid nid is set to memblks */
for_each_memblock(memory, mblk)
if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
pr_warn("NUMA: Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
mblk->nid, mblk->base,
mblk->base + mblk->size - 1);
return -EINVAL;
}
/* Finally register nodes. */
for_each_node_mask(nid, numa_nodes_parsed) {
unsigned long start_pfn, end_pfn;
get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
setup_node_data(nid, start_pfn, end_pfn);
node_set_online(nid);
}
/* Setup online nodes to actual nodes*/
node_possible_map = numa_nodes_parsed;
return 0;
}
static int __init numa_init(int (*init_func)(void))
{
int ret;
nodes_clear(numa_nodes_parsed);
nodes_clear(node_possible_map);
nodes_clear(node_online_map);
numa_free_distance();
ret = numa_alloc_distance();
if (ret < 0)
return ret;
ret = init_func();
if (ret < 0)
return ret;
if (nodes_empty(numa_nodes_parsed))
return -EINVAL;
ret = numa_register_nodes();
if (ret < 0)
return ret;
setup_node_to_cpumask_map();
/* init boot processor */
cpu_to_node_map[0] = 0;
map_cpu_to_node(0, 0);
return 0;
}
/**
* dummy_numa_init - Fallback dummy NUMA init
*
* Used if there's no underlying NUMA architecture, NUMA initialization
* fails, or NUMA is disabled on the command line.
*
* Must online at least one node (node 0) and add memory blocks that cover all
* allowed memory. It is unlikely that this function fails.
*/
static int __init dummy_numa_init(void)
{
int ret;
struct memblock_region *mblk;
pr_info("%s\n", "No NUMA configuration found");
pr_info("NUMA: Faking a node at [mem %#018Lx-%#018Lx]\n",
0LLU, PFN_PHYS(max_pfn) - 1);
for_each_memblock(memory, mblk) {
ret = numa_add_memblk(0, mblk->base, mblk->size);
if (!ret)
continue;
pr_err("NUMA init failed\n");
return ret;
}
numa_off = 1;
return 0;
}
/**
* arm64_numa_init - Initialize NUMA
*
* Try each configured NUMA initialization method until one succeeds. The
* last fallback is dummy single node config encomapssing whole memory.
*/
void __init arm64_numa_init(void)
{
if (!numa_off) {
if (!numa_init(of_numa_init))
return;
}
numa_init(dummy_numa_init);
}