git.oblomov.eu Git - linux-2.6/blob - arch/x86/kernel/genapic_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/ipi.h>
  23 #include <asm/genapic.h>
  24
  25 #ifdef CONFIG_ACPI
  26 #include <acpi/acpi_bus.h>
  27 #endif
  28
  29 DEFINE_PER_CPU(int, x2apic_extra_bits);
  30
  31 struct genapic __read_mostly *genapic = &apic_flat;
  32
  33 static int x2apic_phys = 0;
  34
  35 static int set_x2apic_phys_mode(char *arg)
  36 {
  37         x2apic_phys = 1;
  38         return 0;
  39 }
  40 early_param("x2apic_phys", set_x2apic_phys_mode);
  41
  42 static enum uv_system_type uv_system_type;
  43
  44 /*
  45  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  46  */
  47 void __init setup_apic_routing(void)
  48 {
  49         if (uv_system_type == UV_NON_UNIQUE_APIC)
  50                 genapic = &apic_x2apic_uv_x;
  51         else if (cpu_has_x2apic && intr_remapping_enabled) {
  52                 if (x2apic_phys)
  53                         genapic = &apic_x2apic_phys;
  54                 else
  55                         genapic = &apic_x2apic_cluster;
  56         } else
  57 #ifdef CONFIG_ACPI
  58         /*
  59          * Quirk: some x86_64 machines can only use physical APIC mode
  60          * regardless of how many processors are present (x86_64 ES7000
  61          * is an example).
  62          */
  63         if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
  64                         (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
  65                 genapic = &apic_physflat;
  66         else
  67 #endif
  68
  69         if (max_physical_apicid < 8)
  70                 genapic = &apic_flat;
  71         else
  72                 genapic = &apic_physflat;
  73
  74         printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
  75 }
  76
  77 /* Same for both flat and physical. */
  78
  79 void apic_send_IPI_self(int vector)
  80 {
  81         __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  82 }
  83
  84 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  85 {
  86         if (!strcmp(oem_id, "SGI")) {
  87                 if (!strcmp(oem_table_id, "UVL"))
  88                         uv_system_type = UV_LEGACY_APIC;
  89                 else if (!strcmp(oem_table_id, "UVX"))
  90                         uv_system_type = UV_X2APIC;
  91                 else if (!strcmp(oem_table_id, "UVH"))
  92                         uv_system_type = UV_NON_UNIQUE_APIC;
  93         }
  94         return 0;
  95 }
  96
  97 enum uv_system_type get_uv_system_type(void)
  98 {
  99         return uv_system_type;
 100 }
 101
 102 int is_uv_system(void)
 103 {
 104         return uv_system_type != UV_NONE;
 105 }