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 pr_debug("SRAT: PXM %u -> APIC 0x%04x -> Node %u\n", pxm, apic_id, node); 61 } 62 63 /* Callback for Proximity Domain -> LAPIC mapping */ 64 void __init 65 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 66 { 67 int pxm, node; 68 int apic_id; 69 70 if (srat_disabled()) 71 return; 72 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) { 73 bad_srat(); 74 return; 75 } 76 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0) 77 return; 78 pxm = pa->proximity_domain_lo; 79 if (acpi_srat_revision >= 2) 80 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8; 81 node = acpi_map_pxm_to_node(pxm); 82 if (node < 0) { 83 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm); 84 bad_srat(); 85 return; 86 } 87 88 if (get_uv_system_type() >= UV_X2APIC) 89 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid; 90 else 91 apic_id = pa->apic_id; 92 93 if (apic_id >= MAX_LOCAL_APIC) { 94 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node); 95 return; 96 } 97 98 set_apicid_to_node(apic_id, node); 99 node_set(node, numa_nodes_parsed); 100 pr_debug("SRAT: PXM %u -> APIC 0x%02x -> Node %u\n", pxm, apic_id, node); 101 } 102 103 int __init x86_acpi_numa_init(void) 104 { 105 int ret; 106 107 ret = acpi_numa_init(); 108 if (ret < 0) 109 return ret; 110 return srat_disabled() ? -EINVAL : 0; 111 } 112