1 // SPDX-License-Identifier: GPL-2.0
3 * ACPI 5.1 based NUMA setup for ARM64
4 * Lots of code was borrowed from arch/x86/mm/srat.c
6 * Copyright 2004 Andi Kleen, SuSE Labs.
7 * Copyright (C) 2013-2016, Linaro Ltd.
8 * Author: Hanjun Guo <hanjun.guo@linaro.org>
10 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
12 * Called from acpi_numa_init while reading the SRAT and SLIT tables.
13 * Assumes all memory regions belonging to a single proximity domain
14 * are in one chunk. Holes between them will be included in the node.
17 #define pr_fmt(fmt) "ACPI: NUMA: " fmt
19 #include <linux/acpi.h>
20 #include <linux/bitmap.h>
21 #include <linux/bootmem.h>
22 #include <linux/kernel.h>
24 #include <linux/memblock.h>
25 #include <linux/mmzone.h>
26 #include <linux/module.h>
27 #include <linux/topology.h>
29 #include <acpi/processor.h>
32 static int cpus_in_srat;
34 struct __node_cpu_hwid {
35 u32 node_id; /* logical node containing this CPU */
36 u64 cpu_hwid; /* MPIDR for this CPU */
39 static struct __node_cpu_hwid early_node_cpu_hwid[NR_CPUS] = {
40 [0 ... NR_CPUS - 1] = {NUMA_NO_NODE, PHYS_CPUID_INVALID} };
42 int acpi_numa_get_nid(unsigned int cpu, u64 hwid)
46 for (i = 0; i < cpus_in_srat; i++) {
47 if (hwid == early_node_cpu_hwid[i].cpu_hwid)
48 return early_node_cpu_hwid[i].node_id;
54 /* Callback for Proximity Domain -> ACPI processor UID mapping */
55 void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
63 if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
64 pr_err("SRAT: Invalid SRAT header length: %d\n",
70 if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
73 if (cpus_in_srat >= NR_CPUS) {
74 pr_warn_once("SRAT: cpu_to_node_map[%d] is too small, may not be able to use all cpus\n",
79 pxm = pa->proximity_domain;
80 node = acpi_map_pxm_to_node(pxm);
82 if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
83 pr_err("SRAT: Too many proximity domains %d\n", pxm);
88 mpidr = acpi_map_madt_entry(pa->acpi_processor_uid);
89 if (mpidr == PHYS_CPUID_INVALID) {
90 pr_err("SRAT: PXM %d with ACPI ID %d has no valid MPIDR in MADT\n",
91 pxm, pa->acpi_processor_uid);
96 early_node_cpu_hwid[cpus_in_srat].node_id = node;
97 early_node_cpu_hwid[cpus_in_srat].cpu_hwid = mpidr;
98 node_set(node, numa_nodes_parsed);
100 pr_info("SRAT: PXM %d -> MPIDR 0x%Lx -> Node %d\n",
104 int __init arm64_acpi_numa_init(void)
108 ret = acpi_numa_init();
110 pr_info("Failed to initialise from firmware\n");
114 return srat_disabled() ? -EINVAL : 0;