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)
46 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for
47 * I/O localities since SRAT does not list them. I/O localities are
48 * not supported at this point.
50 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
54 for (i = 0; i < slit->locality_count; i++) {
55 if (pxm_to_node(i) == NUMA_NO_NODE)
57 for (j = 0; j < slit->locality_count; j++) {
58 if (pxm_to_node(j) == NUMA_NO_NODE)
60 numa_set_distance(pxm_to_node(i), pxm_to_node(j),
61 slit->entry[slit->locality_count * i + j]);
66 /* Callback for Proximity Domain -> x2APIC mapping */
68 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
75 if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
79 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
81 pxm = pa->proximity_domain;
82 apic_id = pa->apic_id;
83 if (!apic->apic_id_valid(apic_id)) {
84 printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
88 node = setup_node(pxm);
90 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
95 if (apic_id >= MAX_LOCAL_APIC) {
96 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
99 set_apicid_to_node(apic_id, node);
100 node_set(node, numa_nodes_parsed);
102 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
106 /* Callback for Proximity Domain -> LAPIC mapping */
108 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
115 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
119 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
121 pxm = pa->proximity_domain_lo;
122 if (acpi_srat_revision >= 2)
123 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
124 node = setup_node(pxm);
126 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
131 if (get_uv_system_type() >= UV_X2APIC)
132 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
134 apic_id = pa->apic_id;
136 if (apic_id >= MAX_LOCAL_APIC) {
137 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
141 set_apicid_to_node(apic_id, node);
142 node_set(node, numa_nodes_parsed);
144 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
148 #ifdef CONFIG_MEMORY_HOTPLUG
149 static inline int save_add_info(void) {return 1;}
151 static inline int save_add_info(void) {return 0;}
154 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
156 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
164 if (ma->header.length != sizeof(struct acpi_srat_mem_affinity))
165 goto out_err_bad_srat;
166 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
168 hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
169 if (hotpluggable && !save_add_info())
172 start = ma->base_address;
173 end = start + ma->length;
174 pxm = ma->proximity_domain;
175 if (acpi_srat_revision <= 1)
178 node = setup_node(pxm);
180 printk(KERN_ERR "SRAT: Too many proximity domains.\n");
181 goto out_err_bad_srat;
184 if (numa_add_memblk(node, start, end) < 0)
185 goto out_err_bad_srat;
187 node_set(node, numa_nodes_parsed);
189 pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s\n",
191 (unsigned long long) start, (unsigned long long) end - 1,
192 hotpluggable ? " hotplug" : "");
194 /* Mark hotplug range in memblock. */
195 if (hotpluggable && memblock_mark_hotplug(start, ma->length))
196 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
197 (unsigned long long)start, (unsigned long long)end - 1);
206 void __init acpi_numa_arch_fixup(void) {}
208 int __init x86_acpi_numa_init(void)
212 ret = acpi_numa_init();
215 return srat_disabled() ? -EINVAL : 0;