2 * ACPI 3.0 based NUMA setup
3 * Copyright 2004 Andi Kleen, SuSE Labs.
5 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
7 * Called from acpi_numa_init while reading the SRAT and SLIT tables.
8 * Assumes all memory regions belonging to a single proximity domain
9 * are in one chunk. Holes between them will be included in the node.
12 #include <linux/kernel.h>
13 #include <linux/acpi.h>
14 #include <linux/mmzone.h>
15 #include <linux/bitmap.h>
16 #include <linux/module.h>
17 #include <linux/topology.h>
18 #include <linux/bootmem.h>
19 #include <linux/memblock.h>
21 #include <asm/proto.h>
25 #include <asm/uv/uv.h>
27 int acpi_numa __initdata;
29 static __init int setup_node(int pxm)
31 return acpi_map_pxm_to_node(pxm);
34 static __init void bad_srat(void)
36 printk(KERN_ERR "SRAT: SRAT not used.\n");
40 static __init inline int srat_disabled(void)
45 /* Callback for SLIT parsing */
46 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
50 for (i = 0; i < slit->locality_count; i++)
51 for (j = 0; j < slit->locality_count; j++)
52 numa_set_distance(pxm_to_node(i), pxm_to_node(j),
53 slit->entry[slit->locality_count * i + j]);
56 /* Callback for Proximity Domain -> x2APIC mapping */
58 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
65 if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
69 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
71 pxm = pa->proximity_domain;
72 node = setup_node(pxm);
74 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
79 apic_id = pa->apic_id;
80 if (apic_id >= MAX_LOCAL_APIC) {
81 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
84 set_apicid_to_node(apic_id, node);
85 node_set(node, numa_nodes_parsed);
87 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
91 /* Callback for Proximity Domain -> LAPIC mapping */
93 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
100 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
104 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
106 pxm = pa->proximity_domain_lo;
107 node = setup_node(pxm);
109 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
114 if (get_uv_system_type() >= UV_X2APIC)
115 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
117 apic_id = pa->apic_id;
119 if (apic_id >= MAX_LOCAL_APIC) {
120 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
124 set_apicid_to_node(apic_id, node);
125 node_set(node, numa_nodes_parsed);
127 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
131 #ifdef CONFIG_MEMORY_HOTPLUG
132 static inline int save_add_info(void) {return 1;}
134 static inline int save_add_info(void) {return 0;}
137 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
139 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
146 if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
150 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
153 if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
155 start = ma->base_address;
156 end = start + ma->length;
157 pxm = ma->proximity_domain;
158 node = setup_node(pxm);
160 printk(KERN_ERR "SRAT: Too many proximity domains.\n");
165 if (numa_add_memblk(node, start, end) < 0) {
170 printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm,
174 void __init acpi_numa_arch_fixup(void) {}
176 int __init x86_acpi_numa_init(void)
180 ret = acpi_numa_init();
183 return srat_disabled() ? -EINVAL : 0;