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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/bootmem.h>
22#include <linux/kernel.h>
23#include <linux/mm.h>
24#include <linux/memblock.h>
25#include <linux/mmzone.h>
26#include <linux/module.h>
27#include <linux/topology.h>
28
29#include <acpi/processor.h>
30#include <asm/numa.h>
31
32static int cpus_in_srat;
33
34struct __node_cpu_hwid {
35 u32 node_id; /* logical node containing this CPU */
36 u64 cpu_hwid; /* MPIDR for this CPU */
37};
38
39static struct __node_cpu_hwid early_node_cpu_hwid[NR_CPUS] = {
40[0 ... NR_CPUS - 1] = {NUMA_NO_NODE, PHYS_CPUID_INVALID} };
41
42int acpi_numa_get_nid(unsigned int cpu, u64 hwid)
43{
44 int i;
45
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;
49 }
50
51 return NUMA_NO_NODE;
52}
53
54/* Callback for Proximity Domain -> ACPI processor UID mapping */
55void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
56{
57 int pxm, node;
58 phys_cpuid_t mpidr;
59
60 if (srat_disabled())
61 return;
62
63 if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
64 pr_err("SRAT: Invalid SRAT header length: %d\n",
65 pa->header.length);
66 bad_srat();
67 return;
68 }
69
70 if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
71 return;
72
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",
75 NR_CPUS);
76 return;
77 }
78
79 pxm = pa->proximity_domain;
80 node = acpi_map_pxm_to_node(pxm);
81
82 if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
83 pr_err("SRAT: Too many proximity domains %d\n", pxm);
84 bad_srat();
85 return;
86 }
87
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);
92 bad_srat();
93 return;
94 }
95
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);
99 cpus_in_srat++;
100 pr_info("SRAT: PXM %d -> MPIDR 0x%Lx -> Node %d\n",
101 pxm, mpidr, node);
102}
103
104int __init arm64_acpi_numa_init(void)
105{
106 int ret;
107
108 ret = acpi_numa_init();
109 if (ret) {
110 pr_info("Failed to initialise from firmware\n");
111 return ret;
112 }
113
114 return srat_disabled() ? -EINVAL : 0;
115}
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 || node >= MAX_NUMNODES) {
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