arch/x86/kernel/apic/probe_64.c

   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
  26 extern struct apic apic_flat;
  27 extern struct apic apic_physflat;
  28 extern struct apic apic_x2xpic_uv_x;
  29 extern struct apic apic_x2apic_phys;
  30 extern struct apic apic_x2apic_cluster;
  31
  32 struct apic __read_mostly *apic = &apic_flat;
  33 EXPORT_SYMBOL_GPL(apic);
  34
  35 static 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
  47 /*
  48  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  49  */
  50 void __init default_setup_apic_routing(void)
  51 {
  52 #ifdef CONFIG_X86_X2APIC
  53         if (x2apic_mode && (apic != &apic_x2apic_phys &&
  54 #ifdef CONFIG_X86_UV
  55                        apic != &apic_x2apic_uv_x &&
  56 #endif
  57                        apic != &apic_x2apic_cluster)) {
  58                 if (x2apic_phys)
  59                         apic = &apic_x2apic_phys;
  60                 else
  61                         apic = &apic_x2apic_cluster;
  62                 printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);
  63         }
  64 #endif
  65
  66         if (apic == &apic_flat) {
  67                 if (max_physical_apicid >= 8)
  68                         apic = &apic_physflat;
  69                 printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);
  70         }
  71
  72         /*
  73          * Now that apic routing model is selected, configure the
  74          * fault handling for intr remapping.
  75          */
  76         if (intr_remapping_enabled)
  77                 enable_drhd_fault_handling();
  78 }
  79
  80 /* Same for both flat and physical. */
  81
  82 void apic_send_IPI_self(int vector)
  83 {
  84         __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  85 }
  86
  87 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  88 {
  89         int i;
  90
  91         for (i = 0; apic_probe[i]; ++i) {
  92                 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
  93                         apic = apic_probe[i];
  94                         printk(KERN_INFO "Setting APIC routing to %s.\n",
  95                                 apic->name);
  96                         return 1;
  97                 }
  98         }
  99         return 0;
 100 }