1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ACPI 3.0 based NUMA setup 4 * Copyright 2004 Andi Kleen, SuSE Labs. 5 * 6 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs. 7 * 8 * Called from acpi_numa_init while reading the SRAT and SLIT tables. 9 * Assumes all memory regions belonging to a single proximity domain 10 * are in one chunk. Holes between them will be included in the node. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/acpi.h> 15 #include <linux/mmzone.h> 16 #include <linux/bitmap.h> 17 #include <linux/init.h> 18 #include <linux/topology.h> 19 #include <linux/mm.h> 20 #include <asm/proto.h> 21 #include <asm/numa.h> 22 #include <asm/e820/api.h> 23 #include <asm/apic.h> 24 #include <asm/uv/uv.h> 25 26 /* Callback for Proximity Domain -> x2APIC mapping */ 27 void __init 28 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) 29 { 30 int pxm, node; 31 int apic_id; 32 33 if (srat_disabled()) 34 return; 35 if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) { 36 bad_srat(); 37 return; 38 } 39 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) 40 return; 41 pxm = pa->proximity_domain; 42 apic_id = pa->apic_id; 43 if (!apic_id_valid(apic_id)) { 44 pr_info("SRAT: PXM %u -> X2APIC 0x%04x ignored\n", pxm, apic_id); 45 return; 46 } 47 node = acpi_map_pxm_to_node(pxm); 48 if (node < 0) { 49 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm); 50 bad_srat(); 51 return; 52 } 53 54 if (apic_id >= MAX_LOCAL_APIC) { 55 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node); 56 return; 57 } 58 set_apicid_to_node(apic_id, node); 59 node_set(node, numa_nodes_parsed); 60 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n", 61 pxm, apic_id, node); 62 } 63 64 /* Callback for Proximity Domain -> LAPIC mapping */ 65 void __init 66 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 67 { 68 int pxm, node; 69 int apic_id; 70 71 if (srat_disabled()) 72 return; 73 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) { 74 bad_srat(); 75 return; 76 } 77 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) 78 return; 79 pxm = pa->proximity_domain_lo; 80 if (acpi_srat_revision >= 2) 81 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8; 82 node = acpi_map_pxm_to_node(pxm); 83 if (node < 0) { 84 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm); 85 bad_srat(); 86 return; 87 } 88 89 if (get_uv_system_type() >= UV_X2APIC) 90 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid; 91 else 92 apic_id = pa->apic_id; 93 94 if (apic_id >= MAX_LOCAL_APIC) { 95 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node); 96 return; 97 } 98 99 set_apicid_to_node(apic_id, node); 100 node_set(node, numa_nodes_parsed); 101 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n", 102 pxm, apic_id, node); 103 } 104 105 int __init x86_acpi_numa_init(void) 106 { 107 int ret; 108 109 ret = acpi_numa_init(); 110 if (ret < 0) 111 return ret; 112 return srat_disabled() ? -EINVAL : 0; 113 } 114