1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ACPI 5.1 based NUMA setup for ARM64
4 * Lots of code was borrowed from arch/x86/mm/srat.c
5 *
6 * Copyright 2004 Andi Kleen, SuSE Labs.
7 * Copyright (C) 2013-2016, Linaro Ltd.
8 *		Author: Hanjun Guo <hanjun.guo@linaro.org>
9 *
10 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
11 *
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.
15 */
16
17#define pr_fmt(fmt) "ACPI: NUMA: " fmt
18
19#include <linux/acpi.h>
20#include <linux/bitmap.h>
21#include <linux/kernel.h>
22#include <linux/mm.h>
23#include <linux/memblock.h>
24#include <linux/mmzone.h>
25#include <linux/module.h>
26#include <linux/topology.h>
27
28#include <asm/numa.h>
29
30static int acpi_early_node_map[NR_CPUS] __initdata = { NUMA_NO_NODE };
31
32int __init acpi_numa_get_nid(unsigned int cpu)
33{
34	return acpi_early_node_map[cpu];
35}
36
37static inline int get_cpu_for_acpi_id(u32 uid)
38{
39	int cpu;
40
41	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
42		if (uid == get_acpi_id_for_cpu(cpu))
43			return cpu;
44
45	return -EINVAL;
46}
47
48static int __init acpi_parse_gicc_pxm(union acpi_subtable_headers *header,
49				      const unsigned long end)
50{
51	struct acpi_srat_gicc_affinity *pa;
52	int cpu, pxm, node;
53
54	if (srat_disabled())
55		return -EINVAL;
56
57	pa = (struct acpi_srat_gicc_affinity *)header;
58	if (!pa)
59		return -EINVAL;
60
61	if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
62		return 0;
63
64	pxm = pa->proximity_domain;
65	node = pxm_to_node(pxm);
66
67	/*
68	 * If we can't map the UID to a logical cpu this
69	 * means that the UID is not part of possible cpus
70	 * so we do not need a NUMA mapping for it, skip
71	 * the SRAT entry and keep parsing.
72	 */
73	cpu = get_cpu_for_acpi_id(pa->acpi_processor_uid);
74	if (cpu < 0)
75		return 0;
76
77	acpi_early_node_map[cpu] = node;
78	pr_info("SRAT: PXM %d -> MPIDR 0x%llx -> Node %d\n", pxm,
79		cpu_logical_map(cpu), node);
80
81	return 0;
82}
83
84void __init acpi_map_cpus_to_nodes(void)
85{
86	acpi_table_parse_entries(ACPI_SIG_SRAT, sizeof(struct acpi_table_srat),
87					    ACPI_SRAT_TYPE_GICC_AFFINITY,
88					    acpi_parse_gicc_pxm, 0);
89}
90
91/* Callback for Proximity Domain -> ACPI processor UID mapping */
92void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
93{
94	int pxm, node;
95
96	if (srat_disabled())
97		return;
98
99	if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
100		pr_err("SRAT: Invalid SRAT header length: %d\n",
101			pa->header.length);
102		bad_srat();
103		return;
104	}
105
106	if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
107		return;
108
109	pxm = pa->proximity_domain;
110	node = acpi_map_pxm_to_node(pxm);
111
112	if (node == NUMA_NO_NODE) {
113		pr_err("SRAT: Too many proximity domains %d\n", pxm);
114		bad_srat();
115		return;
116	}
117
118	node_set(node, numa_nodes_parsed);
119}
120
121