Pileus Git - ~andy/linux/blob - 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 static void default_vector_allocation_domain(int cpu, struct cpumask *retmask)
  70 {
  71         /*
  72          * Careful. Some cpus do not strictly honor the set of cpus
  73          * specified in the interrupt destination when using lowest
  74          * priority interrupt delivery mode.
  75          *
  76          * In particular there was a hyperthreading cpu observed to
  77          * deliver interrupts to the wrong hyperthread when only one
  78          * hyperthread was specified in the interrupt desitination.
  79          */
  80         cpumask_clear(retmask);
  81         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
  82 }
  83
  84 /* should be called last. */
  85 static int probe_default(void)
  86 {
  87         return 1;
  88 }
  89
  90 static struct apic apic_default = {
  91
  92         .name                           = "default",
  93         .probe                          = probe_default,
  94         .acpi_madt_oem_check            = NULL,
  95         .apic_id_valid                  = default_apic_id_valid,
  96         .apic_id_registered             = default_apic_id_registered,
  97
  98         .irq_delivery_mode              = dest_LowestPrio,
  99         /* logical delivery broadcast to all CPUs: */
 100         .irq_dest_mode                  = 1,
 101
 102         .target_cpus                    = default_target_cpus,
 103         .disable_esr                    = 0,
 104         .dest_logical                   = APIC_DEST_LOGICAL,
 105         .check_apicid_used              = default_check_apicid_used,
 106         .check_apicid_present           = default_check_apicid_present,
 107
 108         .vector_allocation_domain       = default_vector_allocation_domain,
 109         .init_apic_ldr                  = default_init_apic_ldr,
 110
 111         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
 112         .setup_apic_routing             = setup_apic_flat_routing,
 113         .multi_timer_check              = NULL,
 114         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 115         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 116         .setup_portio_remap             = NULL,
 117         .check_phys_apicid_present      = default_check_phys_apicid_present,
 118         .enable_apic_mode               = NULL,
 119         .phys_pkg_id                    = default_phys_pkg_id,
 120         .mps_oem_check                  = NULL,
 121
 122         .get_apic_id                    = default_get_apic_id,
 123         .set_apic_id                    = NULL,
 124         .apic_id_mask                   = 0x0F << 24,
 125
 126         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 127         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 128
 129         .send_IPI_mask                  = default_send_IPI_mask_logical,
 130         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
 131         .send_IPI_allbutself            = default_send_IPI_allbutself,
 132         .send_IPI_all                   = default_send_IPI_all,
 133         .send_IPI_self                  = default_send_IPI_self,
 134
 135         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 136         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 137
 138         .wait_for_init_deassert         = default_wait_for_init_deassert,
 139
 140         .smp_callin_clear_local_apic    = NULL,
 141         .inquire_remote_apic            = default_inquire_remote_apic,
 142
 143         .read                           = native_apic_mem_read,
 144         .write                          = native_apic_mem_write,
 145         .eoi_write                      = native_apic_mem_write,
 146         .icr_read                       = native_apic_icr_read,
 147         .icr_write                      = native_apic_icr_write,
 148         .wait_icr_idle                  = native_apic_wait_icr_idle,
 149         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 150
 151         .x86_32_early_logical_apicid    = default_x86_32_early_logical_apicid,
 152 };
 153
 154 apic_driver(apic_default);
 155
 156 struct apic *apic = &apic_default;
 157 EXPORT_SYMBOL_GPL(apic);
 158
 159 static int cmdline_apic __initdata;
 160 static int __init parse_apic(char *arg)
 161 {
 162         struct apic **drv;
 163
 164         if (!arg)
 165                 return -EINVAL;
 166
 167         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 168                 if (!strcmp((*drv)->name, arg)) {
 169                         apic = *drv;
 170                         cmdline_apic = 1;
 171                         return 0;
 172                 }
 173         }
 174
 175         /* Parsed again by __setup for debug/verbose */
 176         return 0;
 177 }
 178 early_param("apic", parse_apic);
 179
 180 void __init default_setup_apic_routing(void)
 181 {
 182         int version = apic_version[boot_cpu_physical_apicid];
 183
 184         if (num_possible_cpus() > 8) {
 185                 switch (boot_cpu_data.x86_vendor) {
 186                 case X86_VENDOR_INTEL:
 187                         if (!APIC_XAPIC(version)) {
 188                                 def_to_bigsmp = 0;
 189                                 break;
 190                         }
 191                         /* If P4 and above fall through */
 192                 case X86_VENDOR_AMD:
 193                         def_to_bigsmp = 1;
 194                 }
 195         }
 196
 197 #ifdef CONFIG_X86_BIGSMP
 198         /*
 199          * This is used to switch to bigsmp mode when
 200          * - There is no apic= option specified by the user
 201          * - generic_apic_probe() has chosen apic_default as the sub_arch
 202          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
 203          */
 204
 205         if (!cmdline_apic && apic == &apic_default)
 206                 generic_bigsmp_probe();
 207 #endif
 208
 209         if (apic->setup_apic_routing)
 210                 apic->setup_apic_routing();
 211 }
 212
 213 void __init generic_apic_probe(void)
 214 {
 215         if (!cmdline_apic) {
 216                 struct apic **drv;
 217
 218                 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 219                         if ((*drv)->probe()) {
 220                                 apic = *drv;
 221                                 break;
 222                         }
 223                 }
 224                 /* Not visible without early console */
 225                 if (drv == __apicdrivers_end)
 226                         panic("Didn't find an APIC driver");
 227         }
 228         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
 229 }
 230
 231 /* These functions can switch the APIC even after the initial ->probe() */
 232
 233 int __init
 234 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
 235 {
 236         struct apic **drv;
 237
 238         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 239                 if (!((*drv)->mps_oem_check))
 240                         continue;
 241                 if (!(*drv)->mps_oem_check(mpc, oem, productid))
 242                         continue;
 243
 244                 if (!cmdline_apic) {
 245                         apic = *drv;
 246                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 247                                apic->name);
 248                 }
 249                 return 1;
 250         }
 251         return 0;
 252 }
 253
 254 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 255 {
 256         struct apic **drv;
 257
 258         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 259                 if (!(*drv)->acpi_madt_oem_check)
 260                         continue;
 261                 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
 262                         continue;
 263
 264                 if (!cmdline_apic) {
 265                         apic = *drv;
 266                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 267                                apic->name);
 268                 }
 269                 return 1;
 270         }
 271         return 0;
 272 }