probe_32.c

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/*
 * Default generic APIC driver. This handles up to 8 CPUs.
 *
 * Copyright 2003 Andi Kleen, SuSE Labs.
 * Subject to the GNU Public License, v.2
 *
 * Generic x86 APIC driver probe layer.
 */
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
#include <asm/apic.h>
#include <asm/setup.h>

#include <linux/smp.h>
#include <asm/ipi.h>

#include <linux/interrupt.h>
#include <asm/acpi.h>
#include <asm/e820.h>

#ifdef CONFIG_HOTPLUG_CPU
#define DEFAULT_SEND_IPI    (1)
#else
#define DEFAULT_SEND_IPI    (0)
#endif

int no_broadcast = DEFAULT_SEND_IPI;

static __init int no_ipi_broadcast(char *str)
{
    get_option(&str, &no_broadcast);
    pr_info("Using %s mode\n",
        no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
    return 1;
}
__setup("no_ipi_broadcast=", no_ipi_broadcast);

static int __init print_ipi_mode(void)
{
    pr_info("Using IPI %s mode\n",
        no_broadcast ? "No-Shortcut" : "Shortcut");
    return 0;
}
late_initcall(print_ipi_mode);

static int default_x86_32_early_logical_apicid(int cpu)
{
    return 1 << cpu;
}

static void setup_apic_flat_routing(void)
{
#ifdef CONFIG_X86_IO_APIC
    printk(KERN_INFO
        "Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
        nr_ioapics);
#endif
}

/* should be called last. */
static int probe_default(void)
{
    return 1;
}

static struct apic apic_default = {

    .name               = "default",
    .probe              = probe_default,
    .acpi_madt_oem_check        = NULL,
    .apic_id_valid          = default_apic_id_valid,
    .apic_id_registered     = default_apic_id_registered,

    .irq_delivery_mode      = dest_LowestPrio,
    /* logical delivery broadcast to all CPUs: */
    .irq_dest_mode          = 1,

    .target_cpus            = default_target_cpus,
    .disable_esr            = 0,
    .dest_logical           = APIC_DEST_LOGICAL,
    .check_apicid_used      = default_check_apicid_used,
    .check_apicid_present       = default_check_apicid_present,

    .vector_allocation_domain   = flat_vector_allocation_domain,
    .init_apic_ldr          = default_init_apic_ldr,

    .ioapic_phys_id_map     = default_ioapic_phys_id_map,
    .setup_apic_routing     = setup_apic_flat_routing,
    .multi_timer_check      = NULL,
    .cpu_present_to_apicid      = default_cpu_present_to_apicid,
    .apicid_to_cpu_present      = physid_set_mask_of_physid,
    .setup_portio_remap     = NULL,
    .check_phys_apicid_present  = default_check_phys_apicid_present,
    .enable_apic_mode       = NULL,
    .phys_pkg_id            = default_phys_pkg_id,
    .mps_oem_check          = NULL,

    .get_apic_id            = default_get_apic_id,
    .set_apic_id            = NULL,
    .apic_id_mask           = 0x0F << 24,

    .cpu_mask_to_apicid_and     = flat_cpu_mask_to_apicid_and,

    .send_IPI_mask          = default_send_IPI_mask_logical,
    .send_IPI_mask_allbutself   = default_send_IPI_mask_allbutself_logical,
    .send_IPI_allbutself        = default_send_IPI_allbutself,
    .send_IPI_all           = default_send_IPI_all,
    .send_IPI_self          = default_send_IPI_self,

    .trampoline_phys_low        = DEFAULT_TRAMPOLINE_PHYS_LOW,
    .trampoline_phys_high       = DEFAULT_TRAMPOLINE_PHYS_HIGH,

    .wait_for_init_deassert     = default_wait_for_init_deassert,

    .smp_callin_clear_local_apic    = NULL,
    .inquire_remote_apic        = default_inquire_remote_apic,

    .read               = native_apic_mem_read,
    .write              = native_apic_mem_write,
    .eoi_write          = native_apic_mem_write,
    .icr_read           = native_apic_icr_read,
    .icr_write          = native_apic_icr_write,
    .wait_icr_idle          = native_apic_wait_icr_idle,
    .safe_wait_icr_idle     = native_safe_apic_wait_icr_idle,

    .x86_32_early_logical_apicid    = default_x86_32_early_logical_apicid,
};

apic_driver(apic_default);

struct apic *apic = &apic_default;
EXPORT_SYMBOL_GPL(apic);

static int cmdline_apic __initdata;
static int __init parse_apic(char *arg)
{
    struct apic **drv;

    if (!arg)
        return -EINVAL;

    for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
        if (!strcmp((*drv)->name, arg)) {
            apic = *drv;
            cmdline_apic = 1;
            return 0;
        }
    }

    /* Parsed again by __setup for debug/verbose */
    return 0;
}
early_param("apic", parse_apic);

void __init default_setup_apic_routing(void)
{
    int version = apic_version[boot_cpu_physical_apicid];

    if (num_possible_cpus() > 8) {
        switch (boot_cpu_data.x86_vendor) {
        case X86_VENDOR_INTEL:
            if (!APIC_XAPIC(version)) {
                def_to_bigsmp = 0;
                break;
            }
            /* If P4 and above fall through */
        case X86_VENDOR_AMD:
            def_to_bigsmp = 1;
        }
    }

#ifdef CONFIG_X86_BIGSMP
    /*
     * This is used to switch to bigsmp mode when
     * - There is no apic= option specified by the user
     * - generic_apic_probe() has chosen apic_default as the sub_arch
     * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
     */

    if (!cmdline_apic && apic == &apic_default)
        generic_bigsmp_probe();
#endif

    if (apic->setup_apic_routing)
        apic->setup_apic_routing();

    if (x86_platform.apic_post_init)
        x86_platform.apic_post_init();
}

void __init generic_apic_probe(void)
{
    if (!cmdline_apic) {
        struct apic **drv;

        for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
            if ((*drv)->probe()) {
                apic = *drv;
                break;
            }
        }
        /* Not visible without early console */
        if (drv == __apicdrivers_end)
            panic("Didn't find an APIC driver");
    }
    printk(KERN_INFO "Using APIC driver %s\n", apic->name);
}

/* These functions can switch the APIC even after the initial ->probe() */

int __init
generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
{
    struct apic **drv;

    for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
        if (!((*drv)->mps_oem_check))
            continue;
        if (!(*drv)->mps_oem_check(mpc, oem, productid))
            continue;

        if (!cmdline_apic) {
            apic = *drv;
            printk(KERN_INFO "Switched to APIC driver `%s'.\n",
                   apic->name);
        }
        return 1;
    }
    return 0;
}

int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
    struct apic **drv;

    for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
        if (!(*drv)->acpi_madt_oem_check)
            continue;
        if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
            continue;

        if (!cmdline_apic) {
            apic = *drv;
            printk(KERN_INFO "Switched to APIC driver `%s'.\n",
                   apic->name);
        }
        return 1;
    }
    return 0;
}