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/*
* ACPI 5.1 based NUMA setup for ARM64
* Lots of code was borrowed from arch/x86/mm/srat.c
*
* Copyright 2004 Andi Kleen, SuSE Labs.
* Copyright (C) 2013-2016, Linaro Ltd.
* Author: Hanjun Guo <hanjun.guo@linaro.org>
*
* Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
*
* Called from acpi_numa_init while reading the SRAT and SLIT tables.
* Assumes all memory regions belonging to a single proximity domain
* are in one chunk. Holes between them will be included in the node.
*/
#define pr_fmt(fmt) "ACPI: NUMA: " fmt
#include <linux/acpi.h>
#include <linux/bitmap.h>
#include <linux/bootmem.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/mmzone.h>
#include <linux/module.h>
#include <linux/topology.h>
#include <acpi/processor.h>
#include <asm/numa.h>
static int cpus_in_srat;
struct __node_cpu_hwid {
u32 node_id; /* logical node containing this CPU */
u64 cpu_hwid; /* MPIDR for this CPU */
};
static struct __node_cpu_hwid early_node_cpu_hwid[NR_CPUS] = {
[0 ... NR_CPUS - 1] = {NUMA_NO_NODE, PHYS_CPUID_INVALID} };
int acpi_numa_get_nid(unsigned int cpu, u64 hwid)
{
int i;
for (i = 0; i < cpus_in_srat; i++) {
if (hwid == early_node_cpu_hwid[i].cpu_hwid)
return early_node_cpu_hwid[i].node_id;
}
return NUMA_NO_NODE;
}
/* Callback for Proximity Domain -> ACPI processor UID mapping */
void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
{
int pxm, node;
phys_cpuid_t mpidr;
if (srat_disabled())
return;
if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
pr_err("SRAT: Invalid SRAT header length: %d\n",
pa->header.length);
bad_srat();
return;
}
if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
return;
if (cpus_in_srat >= NR_CPUS) {
pr_warn_once("SRAT: cpu_to_node_map[%d] is too small, may not be able to use all cpus\n",
NR_CPUS);
return;
}
pxm = pa->proximity_domain;
node = acpi_map_pxm_to_node(pxm);
if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
pr_err("SRAT: Too many proximity domains %d\n", pxm);
bad_srat();
return;
}
mpidr = acpi_map_madt_entry(pa->acpi_processor_uid);
if (mpidr == PHYS_CPUID_INVALID) {
pr_err("SRAT: PXM %d with ACPI ID %d has no valid MPIDR in MADT\n",
pxm, pa->acpi_processor_uid);
bad_srat();
return;
}
early_node_cpu_hwid[cpus_in_srat].node_id = node;
early_node_cpu_hwid[cpus_in_srat].cpu_hwid = mpidr;
node_set(node, numa_nodes_parsed);
cpus_in_srat++;
pr_info("SRAT: PXM %d -> MPIDR 0x%Lx -> Node %d\n",
pxm, mpidr, node);
}
int __init arm64_acpi_numa_init(void)
{
int ret;
ret = acpi_numa_init();
if (ret) {
pr_info("Failed to initialise from firmware\n");
return ret;
}
return srat_disabled() ? -EINVAL : 0;
}
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