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