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 = { NUMA_NO_NODE };
31
acpi_numa_get_nid(unsigned int cpu)32 int __init acpi_numa_get_nid(unsigned int cpu)
33 {
34 return acpi_early_node_map[cpu];
35 }
36
get_cpu_for_acpi_id(u32 uid)37 static 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
acpi_parse_gicc_pxm(union acpi_subtable_headers * header,const unsigned long end)48 static 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
acpi_map_cpus_to_nodes(void)84 void __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 */
acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity * pa)92 void __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
