1 /* 2 * ACPI 5.1 based NUMA setup for ARM64 3 * Lots of code was borrowed from arch/x86/mm/srat.c 4 * 5 * Copyright 2004 Andi Kleen, SuSE Labs. 6 * Copyright (C) 2013-2016, Linaro Ltd. 7 * Author: Hanjun Guo <hanjun.guo@linaro.org> 8 * 9 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs. 10 * 11 * Called from acpi_numa_init while reading the SRAT and SLIT tables. 12 * Assumes all memory regions belonging to a single proximity domain 13 * are in one chunk. Holes between them will be included in the node. 14 */ 15 16 #define pr_fmt(fmt) "ACPI: NUMA: " fmt 17 18 #include <linux/acpi.h> 19 #include <linux/bitmap.h> 20 #include <linux/bootmem.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 <acpi/processor.h> 29 #include <asm/numa.h> 30 31 static int cpus_in_srat; 32 33 struct __node_cpu_hwid { 34 u32 node_id; /* logical node containing this CPU */ 35 u64 cpu_hwid; /* MPIDR for this CPU */ 36 }; 37 38 static struct __node_cpu_hwid early_node_cpu_hwid[NR_CPUS] = { 39 [0 ... NR_CPUS - 1] = {NUMA_NO_NODE, PHYS_CPUID_INVALID} }; 40 41 int acpi_numa_get_nid(unsigned int cpu, u64 hwid) 42 { 43 int i; 44 45 for (i = 0; i < cpus_in_srat; i++) { 46 if (hwid == early_node_cpu_hwid[i].cpu_hwid) 47 return early_node_cpu_hwid[i].node_id; 48 } 49 50 return NUMA_NO_NODE; 51 } 52 53 /* Callback for Proximity Domain -> ACPI processor UID mapping */ 54 void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa) 55 { 56 int pxm, node; 57 phys_cpuid_t mpidr; 58 59 if (srat_disabled()) 60 return; 61 62 if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) { 63 pr_err("SRAT: Invalid SRAT header length: %d\n", 64 pa->header.length); 65 bad_srat(); 66 return; 67 } 68 69 if (!(pa->flags & ACPI_SRAT_GICC_ENABLED)) 70 return; 71 72 if (cpus_in_srat >= NR_CPUS) { 73 pr_warn_once("SRAT: cpu_to_node_map[%d] is too small, may not be able to use all cpus\n", 74 NR_CPUS); 75 return; 76 } 77 78 pxm = pa->proximity_domain; 79 node = acpi_map_pxm_to_node(pxm); 80 81 if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) { 82 pr_err("SRAT: Too many proximity domains %d\n", pxm); 83 bad_srat(); 84 return; 85 } 86 87 mpidr = acpi_map_madt_entry(pa->acpi_processor_uid); 88 if (mpidr == PHYS_CPUID_INVALID) { 89 pr_err("SRAT: PXM %d with ACPI ID %d has no valid MPIDR in MADT\n", 90 pxm, pa->acpi_processor_uid); 91 bad_srat(); 92 return; 93 } 94 95 early_node_cpu_hwid[cpus_in_srat].node_id = node; 96 early_node_cpu_hwid[cpus_in_srat].cpu_hwid = mpidr; 97 node_set(node, numa_nodes_parsed); 98 cpus_in_srat++; 99 pr_info("SRAT: PXM %d -> MPIDR 0x%Lx -> Node %d\n", 100 pxm, mpidr, node); 101 } 102 103 int __init arm64_acpi_numa_init(void) 104 { 105 int ret; 106 107 ret = acpi_numa_init(); 108 if (ret) { 109 pr_info("Failed to initialise from firmware\n"); 110 return ret; 111 } 112 113 return srat_disabled() ? -EINVAL : 0; 114 } 115