arch/x86/mach-generic/probe.c

   1 /*
   2  * Copyright 2003 Andi Kleen, SuSE Labs.
   3  * Subject to the GNU Public License, v.2
   4  *
   5  * Generic x86 APIC driver probe layer.
   6  */
   7 #include <linux/threads.h>
   8 #include <linux/cpumask.h>
   9 #include <linux/string.h>
  10 #include <linux/kernel.h>
  11 #include <linux/ctype.h>
  12 #include <linux/init.h>
  13 #include <linux/errno.h>
  14 #include <asm/fixmap.h>
  15 #include <asm/mpspec.h>
  16 #include <asm/apicdef.h>
  17 #include <asm/genapic.h>
  18
  19 extern struct genapic apic_numaq;
  20 extern struct genapic apic_summit;
  21 extern struct genapic apic_bigsmp;
  22 extern struct genapic apic_es7000;
  23 extern struct genapic apic_default;
  24
  25 struct genapic *genapic = &apic_default;
  26
  27 static struct genapic *apic_probe[] __initdata = {
  28 #ifdef CONFIG_X86_NUMAQ
  29         &apic_numaq,
  30 #endif
  31 #ifdef CONFIG_X86_SUMMIT
  32         &apic_summit,
  33 #endif
  34 #ifdef CONFIG_X86_BIGSMP
  35         &apic_bigsmp,
  36 #endif
  37 #ifdef CONFIG_X86_ES7000
  38         &apic_es7000,
  39 #endif
  40         &apic_default,  /* must be last */
  41         NULL,
  42 };
  43
  44 static int cmdline_apic __initdata;
  45 static int __init parse_apic(char *arg)
  46 {
  47         int i;
  48
  49         if (!arg)
  50                 return -EINVAL;
  51
  52         for (i = 0; apic_probe[i]; i++) {
  53                 if (!strcmp(apic_probe[i]->name, arg)) {
  54                         genapic = apic_probe[i];
  55                         cmdline_apic = 1;
  56                         return 0;
  57                 }
  58         }
  59
  60         /* Parsed again by __setup for debug/verbose */
  61         return 0;
  62 }
  63 early_param("apic", parse_apic);
  64
  65 void __init generic_bigsmp_probe(void)
  66 {
  67 #ifdef CONFIG_X86_BIGSMP
  68         /*
  69          * This routine is used to switch to bigsmp mode when
  70          * - There is no apic= option specified by the user
  71          * - generic_apic_probe() has chosen apic_default as the sub_arch
  72          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
  73          */
  74
  75         if (!cmdline_apic && genapic == &apic_default)
  76                 if (apic_bigsmp.probe()) {
  77                         genapic = &apic_bigsmp;
  78                         printk(KERN_INFO "Overriding APIC driver with %s\n",
  79                                genapic->name);
  80                 }
  81 #endif
  82 }
  83
  84 void __init generic_apic_probe(void)
  85 {
  86         if (!cmdline_apic) {
  87                 int i;
  88                 for (i = 0; apic_probe[i]; i++) {
  89                         if (apic_probe[i]->probe()) {
  90                                 genapic = apic_probe[i];
  91                                 break;
  92                         }
  93                 }
  94                 /* Not visible without early console */
  95                 if (!apic_probe[i])
  96                         panic("Didn't find an APIC driver");
  97         }
  98         printk(KERN_INFO "Using APIC driver %s\n", genapic->name);
  99 }
 100
 101 /* These functions can switch the APIC even after the initial ->probe() */
 102
 103 int __init mps_oem_check(struct mp_config_table *mpc, char *oem,
 104                                  char *productid)
 105 {
 106         int i;
 107         for (i = 0; apic_probe[i]; ++i) {
 108                 if (apic_probe[i]->mps_oem_check(mpc, oem, productid)) {
 109                         if (!cmdline_apic) {
 110                                 genapic = apic_probe[i];
 111                                 printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 112                                        genapic->name);
 113                         }
 114                         return 1;
 115                 }
 116         }
 117         return 0;
 118 }
 119
 120 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 121 {
 122         int i;
 123         for (i = 0; apic_probe[i]; ++i) {
 124                 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
 125                         if (!cmdline_apic) {
 126                                 genapic = apic_probe[i];
 127                                 printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 128                                        genapic->name);
 129                         }
 130                         return 1;
 131                 }
 132         }
 133         return 0;
 134 }
 135
 136 int hard_smp_processor_id(void)
 137 {
 138         return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
 139 }