LXR linux/arch/x86/kernel/apic/probe

   1/*
   2 * Copyright 2004 James Cleverdon, IBM.
   3 * Subject to the GNU Public License, v.2
   4 *
   5 * Generic APIC sub-arch probe layer.
   6 *
   7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
   8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
   9 * James Cleverdon.
  10 */
  11#include <linux/threads.h>
  12#include <linux/cpumask.h>
  13#include <linux/string.h>
  14#include <linux/module.h>
  15#include <linux/kernel.h>
  16#include <linux/ctype.h>
  17#include <linux/init.h>
  18#include <linux/hardirq.h>
  19#include <linux/dmar.h>
  20
  21#include <asm/smp.h>
  22#include <asm/apic.h>
  23#include <asm/ipi.h>
  24#include <asm/setup.h>
  25
  26extern struct apic apic_flat;
  27extern struct apic apic_physflat;
  28extern struct apic apic_x2xpic_uv_x;
  29extern struct apic apic_x2apic_phys;
  30extern struct apic apic_x2apic_cluster;
  31
  32struct apic __read_mostly *apic = &apic_flat;
  33EXPORT_SYMBOL_GPL(apic);
  34
  35static struct apic *apic_probe[] __initdata = {
  36#ifdef CONFIG_X86_UV
  37        &apic_x2apic_uv_x,
  38#endif
  39#ifdef CONFIG_X86_X2APIC
  40        &apic_x2apic_phys,
  41        &apic_x2apic_cluster,
  42#endif
  43        &apic_physflat,
  44        NULL,
  45};
  46
  47static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
  48{
  49        return hard_smp_processor_id() >> index_msb;
  50}
  51
  52/*
  53 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  54 */
  55void __init default_setup_apic_routing(void)
  56{
  57
  58        enable_IR_x2apic();
  59
  60#ifdef CONFIG_X86_X2APIC
  61        if (x2apic_mode
  62#ifdef CONFIG_X86_UV
  63                       && apic != &apic_x2apic_uv_x
  64#endif
  65                       ) {
  66                if (x2apic_phys)
  67                        apic = &apic_x2apic_phys;
  68                else
  69                        apic = &apic_x2apic_cluster;
  70        }
  71#endif
  72
  73        if (apic == &apic_flat && num_possible_cpus() > 8)
  74                        apic = &apic_physflat;
  75
  76        printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);
  77
  78        if (is_vsmp_box()) {
  79                /* need to update phys_pkg_id */
  80                apic->phys_pkg_id = apicid_phys_pkg_id;
  81        }
  82}
  83
  84/* Same for both flat and physical. */
  85
  86void apic_send_IPI_self(int vector)
  87{
  88        __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  89}
  90
  91int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  92{
  93        int i;
  94
  95        for (i = 0; apic_probe[i]; ++i) {
  96                if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
  97                        apic = apic_probe[i];
  98                        printk(KERN_INFO "Setting APIC routing to %s.\n",
  99                                apic->name);
 100                        return 1;
 101                }
 102        }
 103        return 0;
 104}
 105