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 32 int __init acpi_numa_get_nid(unsigned int cpu) 33 { 34 return acpi_early_node_map[cpu]; 35 } 36 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 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 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 */ 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 || 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 } 120 121