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/export.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/api.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 __ro_after_init = {
  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
 105         .cpu_mask_to_apicid             = flat_cpu_mask_to_apicid,
 106
 107         .send_IPI                       = default_send_IPI_single,
 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         .inquire_remote_apic            = default_inquire_remote_apic,
 115
 116         .read                           = native_apic_mem_read,
 117         .write                          = native_apic_mem_write,
 118         .eoi_write                      = native_apic_mem_write,
 119         .icr_read                       = native_apic_icr_read,
 120         .icr_write                      = native_apic_icr_write,
 121         .wait_icr_idle                  = native_apic_wait_icr_idle,
 122         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 123
 124         .x86_32_early_logical_apicid    = default_x86_32_early_logical_apicid,
 125 };
 126
 127 apic_driver(apic_default);
 128
 129 struct apic *apic __ro_after_init = &apic_default;
 130 EXPORT_SYMBOL_GPL(apic);
 131
 132 static int cmdline_apic __initdata;
 133 static int __init parse_apic(char *arg)
 134 {
 135         struct apic **drv;
 136
 137         if (!arg)
 138                 return -EINVAL;
 139
 140         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 141                 if (!strcmp((*drv)->name, arg)) {
 142                         apic = *drv;
 143                         cmdline_apic = 1;
 144                         return 0;
 145                 }
 146         }
 147
 148         /* Parsed again by __setup for debug/verbose */
 149         return 0;
 150 }
 151 early_param("apic", parse_apic);
 152
 153 void __init default_setup_apic_routing(void)
 154 {
 155         int version = boot_cpu_apic_version;
 156
 157         if (num_possible_cpus() > 8) {
 158                 switch (boot_cpu_data.x86_vendor) {
 159                 case X86_VENDOR_INTEL:
 160                         if (!APIC_XAPIC(version)) {
 161                                 def_to_bigsmp = 0;
 162                                 break;
 163                         }
 164                         /* If P4 and above fall through */
 165                 case X86_VENDOR_AMD:
 166                         def_to_bigsmp = 1;
 167                 }
 168         }
 169
 170 #ifdef CONFIG_X86_BIGSMP
 171         /*
 172          * This is used to switch to bigsmp mode when
 173          * - There is no apic= option specified by the user
 174          * - generic_apic_probe() has chosen apic_default as the sub_arch
 175          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
 176          */
 177
 178         if (!cmdline_apic && apic == &apic_default)
 179                 generic_bigsmp_probe();
 180 #endif
 181
 182         if (apic->setup_apic_routing)
 183                 apic->setup_apic_routing();
 184
 185         if (x86_platform.apic_post_init)
 186                 x86_platform.apic_post_init();
 187 }
 188
 189 void __init generic_apic_probe(void)
 190 {
 191         if (!cmdline_apic) {
 192                 struct apic **drv;
 193
 194                 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 195                         if ((*drv)->probe()) {
 196                                 apic = *drv;
 197                                 break;
 198                         }
 199                 }
 200                 /* Not visible without early console */
 201                 if (drv == __apicdrivers_end)
 202                         panic("Didn't find an APIC driver");
 203         }
 204         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
 205 }
 206
 207 /* This function can switch the APIC even after the initial ->probe() */
 208 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 209 {
 210         struct apic **drv;
 211
 212         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 213                 if (!(*drv)->acpi_madt_oem_check)
 214                         continue;
 215                 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
 216                         continue;
 217
 218                 if (!cmdline_apic) {
 219                         apic = *drv;
 220                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 221                                apic->name);
 222                 }
 223                 return 1;
 224         }
 225         return 0;
 226 }