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  
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  
acpi_parse_gicc_pxm(union acpi_subtable_headers * header,const unsigned long end)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  
acpi_map_cpus_to_nodes(void)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 */
acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity * pa)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