kernel/arch/x86/kernel/apic/probe_32.c

   1 /*
   2  * Default generic APIC driver. This handles up to 8 CPUs.
   3  *
   4  * Copyright 2003 Andi Kleen, SuSE Labs.
   5  * Subject to the GNU Public License, v.2
   6  *
   7  * Generic x86 APIC driver probe layer.
   8  */
   9 #include <linux/threads.h>
  10 #include <linux/cpumask.h>
  11 #include <linux/module.h>
  12 #include <linux/string.h>
  13 #include <linux/kernel.h>
  14 #include <linux/ctype.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 #include <asm/fixmap.h>
  18 #include <asm/mpspec.h>
  19 #include <asm/apicdef.h>
  20 #include <asm/apic.h>
  21 #include <asm/setup.h>
  22
  23 #include <linux/smp.h>
  24 #include <asm/ipi.h>
  25
  26 #include <linux/interrupt.h>
  27 #include <asm/acpi.h>
  28 #include <asm/e820.h>
  29
  30 #ifdef CONFIG_HOTPLUG_CPU
  31 #define DEFAULT_SEND_IPI        (1)
  32 #else
  33 #define DEFAULT_SEND_IPI        (0)
  34 #endif
  35
  36 int no_broadcast = DEFAULT_SEND_IPI;
  37
  38 static __init int no_ipi_broadcast(char *str)
  39 {
  40         get_option(&str, &no_broadcast);
  41         pr_info("Using %s mode\n",
  42                 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
  43         return 1;
  44 }
  45 __setup("no_ipi_broadcast=", no_ipi_broadcast);
  46
  47 static int __init print_ipi_mode(void)
  48 {
  49         pr_info("Using IPI %s mode\n",
  50                 no_broadcast ? "No-Shortcut" : "Shortcut");
  51         return 0;
  52 }
  53 late_initcall(print_ipi_mode);
  54
  55 static int default_x86_32_early_logical_apicid(int cpu)
  56 {
  57         return 1 << cpu;
  58 }
  59
  60 static void setup_apic_flat_routing(void)
  61 {
  62 #ifdef CONFIG_X86_IO_APIC
  63         printk(KERN_INFO
  64                 "Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
  65                 nr_ioapics);
  66 #endif
  67 }
  68
  69 /* should be called last. */
  70 static int probe_default(void)
  71 {
  72         return 1;
  73 }
  74
  75 static struct apic apic_default = {
  76
  77         .name                           = "default",
  78         .probe                          = probe_default,
  79         .acpi_madt_oem_check            = NULL,
  80         .apic_id_valid                  = default_apic_id_valid,
  81         .apic_id_registered             = default_apic_id_registered,
  82
  83         .irq_delivery_mode              = dest_LowestPrio,
  84         /* logical delivery broadcast to all CPUs: */
  85         .irq_dest_mode                  = 1,
  86
  87         .target_cpus                    = default_target_cpus,
  88         .disable_esr                    = 0,
  89         .dest_logical                   = APIC_DEST_LOGICAL,
  90         .check_apicid_used              = default_check_apicid_used,
  91
  92         .vector_allocation_domain       = flat_vector_allocation_domain,
  93         .init_apic_ldr                  = default_init_apic_ldr,
  94
  95         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
  96         .setup_apic_routing             = setup_apic_flat_routing,
  97         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
  98         .apicid_to_cpu_present          = physid_set_mask_of_physid,
  99         .check_phys_apicid_present      = default_check_phys_apicid_present,
 100         .phys_pkg_id                    = default_phys_pkg_id,
 101
 102         .get_apic_id                    = default_get_apic_id,
 103         .set_apic_id                    = NULL,
 104         .apic_id_mask                   = 0x0F << 24,
 105
 106         .cpu_mask_to_apicid_and         = flat_cpu_mask_to_apicid_and,
 107
 108         .send_IPI_mask                  = default_send_IPI_mask_logical,
 109         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
 110         .send_IPI_allbutself            = default_send_IPI_allbutself,
 111         .send_IPI_all                   = default_send_IPI_all,
 112         .send_IPI_self                  = default_send_IPI_self,
 113
 114         .wait_for_init_deassert         = true,
 115         .inquire_remote_apic            = default_inquire_remote_apic,
 116
 117         .read                           = native_apic_mem_read,
 118         .write                          = native_apic_mem_write,
 119         .eoi_write                      = native_apic_mem_write,
 120         .icr_read                       = native_apic_icr_read,
 121         .icr_write                      = native_apic_icr_write,
 122         .wait_icr_idle                  = native_apic_wait_icr_idle,
 123         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 124
 125         .x86_32_early_logical_apicid    = default_x86_32_early_logical_apicid,
 126 };
 127
 128 apic_driver(apic_default);
 129
 130 struct apic *apic = &apic_default;
 131 EXPORT_SYMBOL_GPL(apic);
 132
 133 static int cmdline_apic __initdata;
 134 static int __init parse_apic(char *arg)
 135 {
 136         struct apic **drv;
 137
 138         if (!arg)
 139                 return -EINVAL;
 140
 141         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 142                 if (!strcmp((*drv)->name, arg)) {
 143                         apic = *drv;
 144                         cmdline_apic = 1;
 145                         return 0;
 146                 }
 147         }
 148
 149         /* Parsed again by __setup for debug/verbose */
 150         return 0;
 151 }
 152 early_param("apic", parse_apic);
 153
 154 void __init default_setup_apic_routing(void)
 155 {
 156         int version = apic_version[boot_cpu_physical_apicid];
 157
 158         if (num_possible_cpus() > 8) {
 159                 switch (boot_cpu_data.x86_vendor) {
 160                 case X86_VENDOR_INTEL:
 161                         if (!APIC_XAPIC(version)) {
 162                                 def_to_bigsmp = 0;
 163                                 break;
 164                         }
 165                         /* If P4 and above fall through */
 166                 case X86_VENDOR_AMD:
 167                         def_to_bigsmp = 1;
 168                 }
 169         }
 170
 171 #ifdef CONFIG_X86_BIGSMP
 172         /*
 173          * This is used to switch to bigsmp mode when
 174          * - There is no apic= option specified by the user
 175          * - generic_apic_probe() has chosen apic_default as the sub_arch
 176          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
 177          */
 178
 179         if (!cmdline_apic && apic == &apic_default)
 180                 generic_bigsmp_probe();
 181 #endif
 182
 183         if (apic->setup_apic_routing)
 184                 apic->setup_apic_routing();
 185
 186         if (x86_platform.apic_post_init)
 187                 x86_platform.apic_post_init();
 188 }
 189
 190 void __init generic_apic_probe(void)
 191 {
 192         if (!cmdline_apic) {
 193                 struct apic **drv;
 194
 195                 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 196                         if ((*drv)->probe()) {
 197                                 apic = *drv;
 198                                 break;
 199                         }
 200                 }
 201                 /* Not visible without early console */
 202                 if (drv == __apicdrivers_end)
 203                         panic("Didn't find an APIC driver");
 204         }
 205         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
 206 }
 207
 208 /* This function can switch the APIC even after the initial ->probe() */
 209 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 210 {
 211         struct apic **drv;
 212
 213         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 214                 if (!(*drv)->acpi_madt_oem_check)
 215                         continue;
 216                 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
 217                         continue;
 218
 219                 if (!cmdline_apic) {
 220                         apic = *drv;
 221                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 222                                apic->name);
 223                 }
 224                 return 1;
 225         }
 226         return 0;
 227 }