1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ACPI 6.6 based NUMA setup for RISCV 4 * Lots of code was borrowed from arch/arm64/kernel/acpi_numa.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 * Copyright (C) 2024 Intel Corporation. 10 * 11 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs. 12 * 13 * Called from acpi_numa_init while reading the SRAT and SLIT tables. 14 * Assumes all memory regions belonging to a single proximity domain 15 * are in one chunk. Holes between them will be included in the node. 16 */ 17 18 #define pr_fmt(fmt) "ACPI: NUMA: " fmt 19 20 #include <linux/acpi.h> 21 #include <linux/bitmap.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 <asm/numa.h> 30 31 static int acpi_early_node_map[NR_CPUS] __initdata = { [0 ... NR_CPUS - 1] = NUMA_NO_NODE }; 32 33 static int __init acpi_numa_get_nid(unsigned int cpu) 34 { 35 return acpi_early_node_map[cpu]; 36 } 37 38 static inline int get_cpu_for_acpi_id(u32 uid) 39 { 40 u32 cpu_uid; 41 int ret; 42 43 for (int cpu = 0; cpu < nr_cpu_ids; cpu++) { 44 ret = acpi_get_cpu_uid(cpu, &cpu_uid); 45 if (ret == 0 && uid == cpu_uid) 46 return cpu; 47 } 48 49 return -EINVAL; 50 } 51 52 static int __init acpi_parse_rintc_pxm(union acpi_subtable_headers *header, 53 const unsigned long end) 54 { 55 struct acpi_srat_rintc_affinity *pa; 56 int cpu, pxm, node; 57 58 if (srat_disabled()) 59 return -EINVAL; 60 61 pa = (struct acpi_srat_rintc_affinity *)header; 62 if (!pa) 63 return -EINVAL; 64 65 if (!(pa->flags & ACPI_SRAT_RINTC_ENABLED)) 66 return 0; 67 68 pxm = pa->proximity_domain; 69 node = pxm_to_node(pxm); 70 71 /* 72 * If we can't map the UID to a logical cpu this 73 * means that the UID is not part of possible cpus 74 * so we do not need a NUMA mapping for it, skip 75 * the SRAT entry and keep parsing. 76 */ 77 cpu = get_cpu_for_acpi_id(pa->acpi_processor_uid); 78 if (cpu < 0) 79 return 0; 80 81 acpi_early_node_map[cpu] = node; 82 pr_info("SRAT: PXM %d -> HARTID 0x%lx -> Node %d\n", pxm, 83 cpuid_to_hartid_map(cpu), node); 84 85 return 0; 86 } 87 88 void __init acpi_map_cpus_to_nodes(void) 89 { 90 int i; 91 92 /* 93 * In ACPI, SMP and CPU NUMA information is provided in separate 94 * static tables, namely the MADT and the SRAT. 95 * 96 * Thus, it is simpler to first create the cpu logical map through 97 * an MADT walk and then map the logical cpus to their node ids 98 * as separate steps. 99 */ 100 acpi_table_parse_entries(ACPI_SIG_SRAT, sizeof(struct acpi_table_srat), 101 ACPI_SRAT_TYPE_RINTC_AFFINITY, acpi_parse_rintc_pxm, 0); 102 103 for (i = 0; i < nr_cpu_ids; i++) 104 early_map_cpu_to_node(i, acpi_numa_get_nid(i)); 105 } 106 107 /* Callback for Proximity Domain -> logical node ID mapping */ 108 void __init acpi_numa_rintc_affinity_init(struct acpi_srat_rintc_affinity *pa) 109 { 110 int pxm, node; 111 112 if (srat_disabled()) 113 return; 114 115 if (pa->header.length < sizeof(struct acpi_srat_rintc_affinity)) { 116 pr_err("SRAT: Invalid SRAT header length: %d\n", pa->header.length); 117 bad_srat(); 118 return; 119 } 120 121 if (!(pa->flags & ACPI_SRAT_RINTC_ENABLED)) 122 return; 123 124 pxm = pa->proximity_domain; 125 node = acpi_map_pxm_to_node(pxm); 126 127 if (node == NUMA_NO_NODE) { 128 pr_err("SRAT: Too many proximity domains %d\n", pxm); 129 bad_srat(); 130 return; 131 } 132 133 node_set(node, numa_nodes_parsed); 134 } 135