// SPDX-License-Identifier: GPL-2.0-only
/*
* NUMA support, based on the x86 implementation.
*
* Copyright (C) 2015 Cavium Inc.
* Author: Ganapatrao Kulkarni <[email protected]>
*/
#define pr_fmt(fmt) "NUMA: " fmt
#include <linux/acpi.h>
#include <linux/memblock.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/numa_memblks.h>
#include <asm/sections.h>
static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
bool numa_off;
static __init int numa_parse_early_param(char *opt)
{
if (!opt)
return -EINVAL;
if (str_has_prefix(opt, "off"))
numa_off = true;
if (!strncmp(opt, "fake=", 5))
return numa_emu_cmdline(opt + 5);
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 (node == NUMA_NO_NODE)
return cpu_all_mask;
if (WARN_ON(node < 0 || 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
#ifndef CONFIG_NUMA_EMU
static void numa_update_cpu(unsigned int cpu, bool remove)
{
int nid = cpu_to_node(cpu);
if (nid == NUMA_NO_NODE)
return;
if (remove)
cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
else
cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
}
void numa_add_cpu(unsigned int cpu)
{
numa_update_cpu(cpu, false);
}
void numa_remove_cpu(unsigned int cpu)
{
numa_update_cpu(cpu, true);
}
#endif
void numa_clear_node(unsigned int cpu)
{
numa_remove_cpu(cpu);
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)
{
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]);
}
/* cpumask_of_node() will now work */
pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
}
/*
* Set the cpu to node and mem mapping
*/
void numa_store_cpu_info(unsigned int cpu)
{
set_cpu_numa_node(cpu, 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 || numa_off)
nid = 0;
cpu_to_node_map[cpu] = nid;
/*
* We should set the numa node of cpu0 as soon as possible, because it
* has already been set up online before. cpu_to_node(0) will soon be
* called.
*/
if (!cpu)
set_cpu_numa_node(cpu, nid);
}
#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);
int early_cpu_to_node(int cpu)
{
return cpu_to_node_map[cpu];
}
static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
{
return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
}
void __init setup_per_cpu_areas(void)
{
unsigned long delta;
unsigned int cpu;
int rc = -EINVAL;
if (pcpu_chosen_fc != PCPU_FC_PAGE) {
/*
* Always reserve area for module percpu variables. That's
* what the legacy allocator did.
*/
rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
pcpu_cpu_distance,
early_cpu_to_node);
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
if (rc < 0)
pr_warn("PERCPU: %s allocator failed (%d), falling back to page size\n",
pcpu_fc_names[pcpu_chosen_fc], rc);
#endif
}
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
if (rc < 0)
rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, early_cpu_to_node);
#endif
if (rc < 0)
panic("Failed to initialize percpu areas (err=%d).", rc);
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
for_each_possible_cpu(cpu)
__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
}
#endif
/*
* Initialize NODE_DATA for a node on the local memory
*/
static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
{
if (start_pfn >= end_pfn)
pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
alloc_node_data(nid);
NODE_DATA(nid)->node_id = nid;
NODE_DATA(nid)->node_start_pfn = start_pfn;
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
}
static int __init numa_register_nodes(void)
{
int nid;
/* 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);
ret = numa_memblks_init(init_func, /* memblock_force_top_down */ false);
if (ret < 0)
goto out_free_distance;
if (nodes_empty(numa_nodes_parsed)) {
pr_info("No NUMA configuration found\n");
ret = -EINVAL;
goto out_free_distance;
}
ret = numa_register_nodes();
if (ret < 0)
goto out_free_distance;
setup_node_to_cpumask_map();
return 0;
out_free_distance:
numa_reset_distance();
return ret;
}
/**
* 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.
*
* Return: 0 on success, -errno on failure.
*/
static int __init dummy_numa_init(void)
{
phys_addr_t start = memblock_start_of_DRAM();
phys_addr_t end = memblock_end_of_DRAM() - 1;
int ret;
if (numa_off)
pr_info("NUMA disabled\n"); /* Forced off on command line. */
pr_info("Faking a node at [mem %pap-%pap]\n", &start, &end);
ret = numa_add_memblk(0, start, end + 1);
if (ret) {
pr_err("NUMA init failed\n");
return ret;
}
node_set(0, numa_nodes_parsed);
numa_off = true;
return 0;
}
#ifdef CONFIG_ACPI_NUMA
static int __init arch_acpi_numa_init(void)
{
int ret;
ret = acpi_numa_init();
if (ret) {
pr_debug("Failed to initialise from firmware\n");
return ret;
}
return srat_disabled() ? -EINVAL : 0;
}
#else
static int __init arch_acpi_numa_init(void)
{
return -EOPNOTSUPP;
}
#endif
/**
* arch_numa_init() - Initialize NUMA
*
* Try each configured NUMA initialization method until one succeeds. The
* last fallback is dummy single node config encompassing whole memory.
*/
void __init arch_numa_init(void)
{
if (!numa_off) {
if (!acpi_disabled && !numa_init(arch_acpi_numa_init))
return;
if (acpi_disabled && !numa_init(of_numa_init))
return;
}
numa_init(dummy_numa_init);
}
#ifdef CONFIG_NUMA_EMU
void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys,
unsigned int nr_emu_nids)
{
int i, j;
/*
* Transform cpu_to_node_map table to use emulated nids by
* reverse-mapping phys_nid. The maps should always exist but fall
* back to zero just in case.
*/
for (i = 0; i < ARRAY_SIZE(cpu_to_node_map); i++) {
if (cpu_to_node_map[i] == NUMA_NO_NODE)
continue;
for (j = 0; j < nr_emu_nids; j++)
if (cpu_to_node_map[i] == emu_nid_to_phys[j])
break;
cpu_to_node_map[i] = j < nr_emu_nids ? j : 0;
}
}
u64 __init numa_emu_dma_end(void)
{
return memblock_start_of_DRAM() + SZ_4G;
}
void debug_cpumask_set_cpu(unsigned int cpu, int node, bool enable)
{
struct cpumask *mask;
if (node == NUMA_NO_NODE)
return;
mask = node_to_cpumask_map[node];
if (!cpumask_available(mask)) {
pr_err("node_to_cpumask_map[%i] NULL\n", node);
dump_stack();
return;
}
if (enable)
cpumask_set_cpu(cpu, mask);
else
cpumask_clear_cpu(cpu, mask);
pr_debug("%s cpu %d node %d: mask now %*pbl\n",
enable ? "numa_add_cpu" : "numa_remove_cpu",
cpu, node, cpumask_pr_args(mask));
}
#endif /* CONFIG_NUMA_EMU */
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