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/init.h>
  17 #include <linux/topology.h>
  18 #include <linux/mm.h>
  19 #include <asm/proto.h>
  20 #include <asm/numa.h>
  21 #include <asm/e820.h>
  22 #include <asm/apic.h>
  23 #include <asm/uv/uv.h>
  24
  25 /* Callback for Proximity Domain -> x2APIC mapping */
  26 void __init
  27 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
  28 {
  29         int pxm, node;
  30         int apic_id;
  31
  32         if (srat_disabled())
  33                 return;
  34         if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
  35                 bad_srat();
  36                 return;
  37         }
  38         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  39                 return;
  40         pxm = pa->proximity_domain;
  41         apic_id = pa->apic_id;
  42         if (!apic->apic_id_valid(apic_id)) {
  43                 printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
  44                          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         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
  61                pxm, apic_id, node);
  62 }
  63
  64 /* Callback for Proximity Domain -> LAPIC mapping */
  65 void __init
  66 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
  67 {
  68         int pxm, node;
  69         int apic_id;
  70
  71         if (srat_disabled())
  72                 return;
  73         if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
  74                 bad_srat();
  75                 return;
  76         }
  77         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  78                 return;
  79         pxm = pa->proximity_domain_lo;
  80         if (acpi_srat_revision >= 2)
  81                 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
  82         node = acpi_map_pxm_to_node(pxm);
  83         if (node < 0) {
  84                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
  85                 bad_srat();
  86                 return;
  87         }
  88
  89         if (get_uv_system_type() >= UV_X2APIC)
  90                 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
  91         else
  92                 apic_id = pa->apic_id;
  93
  94         if (apic_id >= MAX_LOCAL_APIC) {
  95                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
  96                 return;
  97         }
  98
  99         set_apicid_to_node(apic_id, node);
 100         node_set(node, numa_nodes_parsed);
 101         printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
 102                pxm, apic_id, node);
 103 }
 104
 105 int __init x86_acpi_numa_init(void)
 106 {
 107         int ret;
 108
 109         ret = acpi_numa_init();
 110         if (ret < 0)
 111                 return ret;
 112         return srat_disabled() ? -EINVAL : 0;
 113 }