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
30 static int acpi_early_node_map[NR_CPUS] __initdata = { [0 ... NR_CPUS - 1] = NUMA_NO_NODE };
31
32 int __init acpi_numa_get_nid(unsigned int cpu)
33 {
34 return acpi_early_node_map[cpu];
35 }
36
37 static int __init acpi_parse_gicc_pxm(union acpi_subtable_headers *header,
38 const unsigned long end)
39 {
40 struct acpi_srat_gicc_affinity *pa;
41 int cpu, pxm, node;
42
43 if (srat_disabled())
44 return -EINVAL;
45
46 pa = (struct acpi_srat_gicc_affinity *)header;
47 if (!pa)
48 return -EINVAL;
49
50 if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
51 return 0;
52
53 pxm = pa->proximity_domain;
54 node = pxm_to_node(pxm);
55
56 /*
57 * If we can't map the UID to a logical cpu this
58 * means that the UID is not part of possible cpus
59 * so we do not need a NUMA mapping for it, skip
60 * the SRAT entry and keep parsing.
61 */
62 cpu = get_cpu_for_acpi_id(pa->acpi_processor_uid);
63 if (cpu < 0)
64 return 0;
65
66 acpi_early_node_map[cpu] = node;
67 pr_info("SRAT: PXM %d -> MPIDR 0x%llx -> Node %d\n", pxm,
68 cpu_logical_map(cpu), node);
69
70 return 0;
71 }
72
73 void __init acpi_map_cpus_to_nodes(void)
74 {
75 acpi_table_parse_entries(ACPI_SIG_SRAT, sizeof(struct acpi_table_srat),
76 ACPI_SRAT_TYPE_GICC_AFFINITY,
77 acpi_parse_gicc_pxm, 0);
78 }
79
80 /* Callback for Proximity Domain -> ACPI processor UID mapping */
81 void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
82 {
83 int pxm, node;
84
85 if (srat_disabled())
86 return;
87
88 if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
89 pr_err("SRAT: Invalid SRAT header length: %d\n",
90 pa->header.length);
91 bad_srat();
92 return;
93 }
94
95 if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
96 return;
97
98 pxm = pa->proximity_domain;
99 node = acpi_map_pxm_to_node(pxm);
100
101 if (node == NUMA_NO_NODE) {
102 pr_err("SRAT: Too many proximity domains %d\n", pxm);
103 bad_srat();
104 return;
105 }
106
107 node_set(node, numa_nodes_parsed);
108 }
109
110
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