// SPDX-License-Identifier: GPL-2.0
/*
 * 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/init.h>
#include <linux/topology.h>
#include <linux/mm.h>
#include <asm/proto.h>
#include <asm/numa.h>
#include <asm/e820/api.h>
#include <asm/apic.h>
#include <asm/uv/uv.h>

/* 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_id_valid(apic_id)) {
                pr_info("SRAT: PXM %u -> X2APIC 0x%04x ignored\n", pxm, apic_id);
                return;
        }
        node = acpi_map_pxm_to_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);
        node_set(node, numa_phys_nodes_parsed);
        pr_debug("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 = acpi_map_pxm_to_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);
        node_set(node, numa_phys_nodes_parsed);
        pr_debug("SRAT: PXM %u -> APIC 0x%02x -> Node %u\n", pxm, apic_id, node);
}

int __init x86_acpi_numa_init(void)
{
        int ret;

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