arch/x86/mm/srat.c

   1 /*
   2  * ACPI 3.0 based NUMA setup
   3  * Copyright 2004 Andi Kleen, SuSE Labs.
   4  *
   5  * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
   6  *
   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.
  10  */
  11
  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>
  20 #include <linux/mm.h>
  21 #include <asm/proto.h>
  22 #include <asm/numa.h>
  23 #include <asm/e820.h>
  24 #include <asm/apic.h>
  25 #include <asm/uv/uv.h>
  26
  27 int acpi_numa __initdata;
  28
  29 static __init int setup_node(int pxm)
  30 {
  31         return acpi_map_pxm_to_node(pxm);
  32 }
  33
  34 static __init void bad_srat(void)
  35 {
  36         printk(KERN_ERR "SRAT: SRAT not used.\n");
  37         acpi_numa = -1;
  38 }
  39
  40 static __init inline int srat_disabled(void)
  41 {
  42         return acpi_numa < 0;
  43 }
  44
  45 /* Callback for SLIT parsing */
  46 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
  47 {
  48         int i, j;
  49
  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]);
  54 }
  55
  56 /* Callback for Proximity Domain -> x2APIC mapping */
  57 void __init
  58 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
  59 {
  60         int pxm, node;
  61         int apic_id;
  62
  63         if (srat_disabled())
  64                 return;
  65         if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
  66                 bad_srat();
  67                 return;
  68         }
  69         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  70                 return;
  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",
  75                          pxm, apic_id);
  76                 return;
  77         }
  78         node = setup_node(pxm);
  79         if (node < 0) {
  80                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
  81                 bad_srat();
  82                 return;
  83         }
  84
  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);
  87                 return;
  88         }
  89         set_apicid_to_node(apic_id, node);
  90         node_set(node, numa_nodes_parsed);
  91         acpi_numa = 1;
  92         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
  93                pxm, apic_id, node);
  94 }
  95
  96 /* Callback for Proximity Domain -> LAPIC mapping */
  97 void __init
  98 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
  99 {
 100         int pxm, node;
 101         int apic_id;
 102
 103         if (srat_disabled())
 104                 return;
 105         if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
 106                 bad_srat();
 107                 return;
 108         }
 109         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
 110                 return;
 111         pxm = pa->proximity_domain_lo;
 112         if (acpi_srat_revision >= 2)
 113                 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
 114         node = setup_node(pxm);
 115         if (node < 0) {
 116                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
 117                 bad_srat();
 118                 return;
 119         }
 120
 121         if (get_uv_system_type() >= UV_X2APIC)
 122                 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
 123         else
 124                 apic_id = pa->apic_id;
 125
 126         if (apic_id >= MAX_LOCAL_APIC) {
 127                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
 128                 return;
 129         }
 130
 131         set_apicid_to_node(apic_id, node);
 132         node_set(node, numa_nodes_parsed);
 133         acpi_numa = 1;
 134         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
 135                pxm, apic_id, node);
 136 }
 137
 138 #ifdef CONFIG_MEMORY_HOTPLUG
 139 static inline int save_add_info(void) {return 1;}
 140 #else
 141 static inline int save_add_info(void) {return 0;}
 142 #endif
 143
 144 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
 145 void __init
 146 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 147 {
 148         u64 start, end;
 149         int node, pxm;
 150
 151         if (srat_disabled())
 152                 return;
 153         if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
 154                 bad_srat();
 155                 return;
 156         }
 157         if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 158                 return;
 159
 160         if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
 161                 return;
 162         start = ma->base_address;
 163         end = start + ma->length;
 164         pxm = ma->proximity_domain;
 165         if (acpi_srat_revision <= 1)
 166                 pxm &= 0xff;
 167         node = setup_node(pxm);
 168         if (node < 0) {
 169                 printk(KERN_ERR "SRAT: Too many proximity domains.\n");
 170                 bad_srat();
 171                 return;
 172         }
 173
 174         if (numa_add_memblk(node, start, end) < 0) {
 175                 bad_srat();
 176                 return;
 177         }
 178
 179         printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm,
 180                start, end);
 181 }
 182
 183 void __init acpi_numa_arch_fixup(void) {}
 184
 185 int __init x86_acpi_numa_init(void)
 186 {
 187         int ret;
 188
 189         ret = acpi_numa_init();
 190         if (ret < 0)
 191                 return ret;
 192         return srat_disabled() ? -EINVAL : 0;
 193 }