arch/x86/mm/srat.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ACPI 3.0 based NUMA setup
   4  * Copyright 2004 Andi Kleen, SuSE Labs.
   5  *
   6  * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
   7  *
   8  * Called from acpi_numa_init while reading the SRAT and SLIT tables.
   9  * Assumes all memory regions belonging to a single proximity domain
  10  * are in one chunk. Holes between them will be included in the node.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/acpi.h>
  15 #include <linux/mmzone.h>
  16 #include <linux/bitmap.h>
  17 #include <linux/init.h>
  18 #include <linux/topology.h>
  19 #include <linux/mm.h>
  20 #include <asm/proto.h>
  21 #include <asm/numa.h>
  22 #include <asm/e820/api.h>
  23 #include <asm/apic.h>
  24 #include <asm/uv/uv.h>
  25
  26 /* Callback for Proximity Domain -> x2APIC mapping */
  27 void __init
  28 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
  29 {
  30         int pxm, node;
  31         int apic_id;
  32
  33         if (srat_disabled())
  34                 return;
  35         if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
  36                 bad_srat();
  37                 return;
  38         }
  39         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  40                 return;
  41         pxm = pa->proximity_domain;
  42         apic_id = pa->apic_id;
  43         if (!apic_id_valid(apic_id)) {
  44                 pr_info("SRAT: PXM %u -> X2APIC 0x%04x ignored\n", 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         pr_debug("SRAT: PXM %u -> APIC 0x%04x -> Node %u\n", pxm, apic_id, node);
  61 }
  62
  63 /* Callback for Proximity Domain -> LAPIC mapping */
  64 void __init
  65 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
  66 {
  67         int pxm, node;
  68         int apic_id;
  69
  70         if (srat_disabled())
  71                 return;
  72         if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
  73                 bad_srat();
  74                 return;
  75         }
  76         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  77                 return;
  78         pxm = pa->proximity_domain_lo;
  79         if (acpi_srat_revision >= 2)
  80                 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
  81         node = acpi_map_pxm_to_node(pxm);
  82         if (node < 0) {
  83                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
  84                 bad_srat();
  85                 return;
  86         }
  87
  88         if (get_uv_system_type() >= UV_X2APIC)
  89                 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
  90         else
  91                 apic_id = pa->apic_id;
  92
  93         if (apic_id >= MAX_LOCAL_APIC) {
  94                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
  95                 return;
  96         }
  97
  98         set_apicid_to_node(apic_id, node);
  99         node_set(node, numa_nodes_parsed);
 100         pr_debug("SRAT: PXM %u -> APIC 0x%02x -> Node %u\n", pxm, apic_id, node);
 101 }
 102
 103 int __init x86_acpi_numa_init(void)
 104 {
 105         int ret;
 106
 107         ret = acpi_numa_init();
 108         if (ret < 0)
 109                 return ret;
 110         return srat_disabled() ? -EINVAL : 0;
 111 }