srat.c

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/*
 * ACPI 3.0 based NUMA setup
 * Copyright 2004 Andi Kleen, SuSE Labs.
 *
 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
 *
 * Called from acpi_numa_init while reading the SRAT and SLIT tables.
 * Assumes all memory regions belonging to a single proximity domain
 * are in one chunk. Holes between them will be included in the node.
 */

#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/mmzone.h>
#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/topology.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <asm/proto.h>
#include <asm/numa.h>
#include <asm/e820.h>
#include <asm/apic.h>
#include <asm/uv/uv.h>

int acpi_numa __initdata;

static __init int setup_node(int pxm)
{
    return acpi_map_pxm_to_node(pxm);
}

static __init void bad_srat(void)
{
    printk(KERN_ERR "SRAT: SRAT not used.\n");
    acpi_numa = -1;
}

static __init inline int srat_disabled(void)
{
    return acpi_numa < 0;
}

/* Callback for SLIT parsing */
void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
{
    int i, j;

    for (i = 0; i < slit->locality_count; i++)
        for (j = 0; j < slit->locality_count; j++)
            numa_set_distance(pxm_to_node(i), pxm_to_node(j),
                slit->entry[slit->locality_count * i + j]);
}

/* Callback for Proximity Domain -> x2APIC mapping */
void __init
acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
{
    int pxm, node;
    int apic_id;

    if (srat_disabled())
        return;
    if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
        bad_srat();
        return;
    }
    if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
        return;
    pxm = pa->proximity_domain;
    apic_id = pa->apic_id;
    if (!apic->apic_id_valid(apic_id)) {
        printk(KERN_INFO "SRAT: PXM %u -> X2APIC 0x%04x ignored\n",
             pxm, apic_id);
        return;
    }
    node = setup_node(pxm);
    if (node < 0) {
        printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
        bad_srat();
        return;
    }

    if (apic_id >= MAX_LOCAL_APIC) {
        printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
        return;
    }
    set_apicid_to_node(apic_id, node);
    node_set(node, numa_nodes_parsed);
    acpi_numa = 1;
    printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
           pxm, apic_id, node);
}

/* Callback for Proximity Domain -> LAPIC mapping */
void __init
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
{
    int pxm, node;
    int apic_id;

    if (srat_disabled())
        return;
    if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
        bad_srat();
        return;
    }
    if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
        return;
    pxm = pa->proximity_domain_lo;
    if (acpi_srat_revision >= 2)
        pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
    node = setup_node(pxm);
    if (node < 0) {
        printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
        bad_srat();
        return;
    }

    if (get_uv_system_type() >= UV_X2APIC)
        apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
    else
        apic_id = pa->apic_id;

    if (apic_id >= MAX_LOCAL_APIC) {
        printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
        return;
    }

    set_apicid_to_node(apic_id, node);
    node_set(node, numa_nodes_parsed);
    acpi_numa = 1;
    printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
           pxm, apic_id, node);
}

#ifdef CONFIG_MEMORY_HOTPLUG
static inline int save_add_info(void) {return 1;}
#else
static inline int save_add_info(void) {return 0;}
#endif

/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
int __init
acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
{
    u64 start, end;
    int node, pxm;

    if (srat_disabled())
        return -1;
    if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
        bad_srat();
        return -1;
    }
    if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
        return -1;

    if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
        return -1;
    start = ma->base_address;
    end = start + ma->length;
    pxm = ma->proximity_domain;
    if (acpi_srat_revision <= 1)
        pxm &= 0xff;
    node = setup_node(pxm);
    if (node < 0) {
        printk(KERN_ERR "SRAT: Too many proximity domains.\n");
        bad_srat();
        return -1;
    }

    if (numa_add_memblk(node, start, end) < 0) {
        bad_srat();
        return -1;
    }

    node_set(node, numa_nodes_parsed);

    printk(KERN_INFO "SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]\n",
           node, pxm,
           (unsigned long long) start, (unsigned long long) end - 1);
    return 0;
}

void __init acpi_numa_arch_fixup(void) {}

int __init x86_acpi_numa_init(void)
{
    int ret;

    ret = acpi_numa_init();
    if (ret < 0)
        return ret;
    return srat_disabled() ? -EINVAL : 0;
}