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 apic_id = pa->apic_id;
73 if (!cpu_has_x2apic && (apic_id >= 0xff)) {
74 printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
78 node = setup_node(pxm);
80 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
85 if (apic_id >= MAX_LOCAL_APIC) {
86 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
89 set_apicid_to_node(apic_id, node);
90 node_set(node, numa_nodes_parsed);
92 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
96 /* Callback for Proximity Domain -> LAPIC mapping */
98 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
105 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
109 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
111 pxm = pa->proximity_domain_lo;
112 node = setup_node(pxm);
114 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
119 if (get_uv_system_type() >= UV_X2APIC)
120 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
122 apic_id = pa->apic_id;
124 if (apic_id >= MAX_LOCAL_APIC) {
125 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
129 set_apicid_to_node(apic_id, node);
130 node_set(node, numa_nodes_parsed);
132 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
136 #ifdef CONFIG_MEMORY_HOTPLUG
137 static inline int save_add_info(void) {return 1;}
139 static inline int save_add_info(void) {return 0;}
142 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
144 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
151 if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
155 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
158 if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
160 start = ma->base_address;
161 end = start + ma->length;
162 pxm = ma->proximity_domain;
163 node = setup_node(pxm);
165 printk(KERN_ERR "SRAT: Too many proximity domains.\n");
170 if (numa_add_memblk(node, start, end) < 0) {
175 printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm,
179 void __init acpi_numa_arch_fixup(void) {}
181 int __init x86_acpi_numa_init(void)
185 ret = acpi_numa_init();
188 return srat_disabled() ? -EINVAL : 0;