/*
 * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Sepherosa Ziehau <sepherosa@gmail.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <vm/vm_page.h>

#include "acpi.h"
#include "acpi_sdt_var.h"

typedef union srat_entry {
        ACPI_SUBTABLE_HEADER    head;
        ACPI_SRAT_CPU_AFFINITY  cpu;
        ACPI_SRAT_MEM_AFFINITY  mem;
        ACPI_SRAT_X2APIC_CPU_AFFINITY   x2apic;
        ACPI_SRAT_GICC_AFFINITY gicc;
} srat_entry_t;

static void
srat_probe(void)
{
        vm_paddr_t srat_paddr;
        ACPI_TABLE_SRAT *srat;
        srat_entry_t *mem;
        srat_entry_t *cpu;
        int error = 0;
        int enabled = 1;
        int disabled = 0;

        /*
         * Allow NUMA to be disabled by either setting kern.numa_disable
         * to 1 or by setting hw.acpi.srat.enabled to 0.
         */
        kgetenv_int("kern.numa_disable", &disabled);
        kgetenv_int("hw.acpi.srat.enabled", &enabled);
        if (disabled || enabled == 0)
                return;

        /*
         * Map the SRAT if it exists
         */
        srat_paddr = sdt_search(ACPI_SIG_SRAT);
        if (srat_paddr == 0) {
                kprintf("srat_probe: can't locate SRAT\n");
                return;
        }

        srat = sdt_sdth_map(srat_paddr);
        KKASSERT(srat != NULL);

        if (srat->Header.Length < sizeof(*srat)) {
                kprintf("acpi: invalid SRAT length %u\n",
                        srat->Header.Length);
                error = EINVAL;
                goto done;
        }

        cpu = NULL;

        for (mem = (srat_entry_t *)(srat + 1);
             (char *)mem < (char *)srat + srat->Header.Length;
             mem = (srat_entry_t *)((char *)mem + mem->head.Length)) {
                /*
                 * Mem scan memory affinity only
                 */
                if (mem->head.Type != ACPI_SRAT_TYPE_MEMORY_AFFINITY)
                        continue;
                if ((mem->mem.Flags & ACPI_SRAT_MEM_ENABLED) == 0)
                        continue;

                kprintf("MemAffinity %016jx,%ldMB Prox=%u ",
                        mem->mem.BaseAddress,
                        mem->mem.Length / (1024 * 1024),
                        mem->mem.ProximityDomain);

                /*
                 * Look for associated cpu affinity
                 */
                if (cpu == NULL ||
                    mem->mem.ProximityDomain != cpu->cpu.ProximityDomainLo) {
                        for (cpu = (srat_entry_t *)(srat + 1);
                             (char *)cpu < (char *)srat + srat->Header.Length;
                             cpu = (srat_entry_t *)((char *)cpu +
                                                    cpu->head.Length)) {
                                if (cpu->head.Type !=
                                    ACPI_SRAT_TYPE_CPU_AFFINITY)
                                        continue;
                                if ((cpu->cpu.Flags &
                                     ACPI_SRAT_CPU_USE_AFFINITY) == 0)
                                        continue;
                                if (mem->mem.ProximityDomain ==
                                    cpu->cpu.ProximityDomainLo) {
                                        break;
                                }
                        }
                        if ((char *)cpu >= (char *)srat + srat->Header.Length)
                                cpu = NULL;
                }
                if (cpu) {
                        kprintf("CpuApicId %02x Socket %d\n",
                                cpu->cpu.ApicId,
                                get_chip_ID_from_APICID(cpu->cpu.ApicId));
                        vm_numa_organize(mem->mem.BaseAddress,
                                         mem->mem.Length,
                                    get_chip_ID_from_APICID(cpu->cpu.ApicId));
                } else {
                        kprintf("(not found)\n");
                }
        }
        vm_numa_organize_finalize();

done:
        sdt_sdth_unmap(&srat->Header);
}

SYSINIT(srat_probe, SI_BOOT2_NUMA, SI_ORDER_FIRST, srat_probe, 0);