LXR linux/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 */
  27void __init
  28acpi_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->apic_id_valid(apic_id)) {
  44                printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
  45                         pxm, apic_id);
  46                return;
  47        }
  48        node = acpi_map_pxm_to_node(pxm);
  49        if (node < 0) {
  50                printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
  51                bad_srat();
  52                return;
  53        }
  54
  55        if (apic_id >= MAX_LOCAL_APIC) {
  56                printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
  57                return;
  58        }
  59        set_apicid_to_node(apic_id, node);
  60        node_set(node, numa_nodes_parsed);
  61        printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
  62               pxm, apic_id, node);
  63}
  64
  65/* Callback for Proximity Domain -> LAPIC mapping */
  66void __init
  67acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
  68{
  69        int pxm, node;
  70        int apic_id;
  71
  72        if (srat_disabled())
  73                return;
  74        if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
  75                bad_srat();
  76                return;
  77        }
  78        if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
  79                return;
  80        pxm = pa->proximity_domain_lo;
  81        if (acpi_srat_revision >= 2)
  82                pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
  83        node = acpi_map_pxm_to_node(pxm);
  84        if (node < 0) {
  85                printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
  86                bad_srat();
  87                return;
  88        }
  89
  90        if (get_uv_system_type() >= UV_X2APIC)
  91                apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
  92        else
  93                apic_id = pa->apic_id;
  94
  95        if (apic_id >= MAX_LOCAL_APIC) {
  96                printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
  97                return;
  98        }
  99
 100        set_apicid_to_node(apic_id, node);
 101        node_set(node, numa_nodes_parsed);
 102        printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
 103               pxm, apic_id, node);
 104}
 105
 106int __init x86_acpi_numa_init(void)
 107{
 108        int ret;
 109
 110        ret = acpi_numa_init();
 111        if (ret < 0)
 112                return ret;
 113        return srat_disabled() ? -EINVAL : 0;
 114}
 115