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_registered             = default_apic_id_registered,
  96
  97         .irq_delivery_mode              = dest_LowestPrio,
  98         /* logical delivery broadcast to all CPUs: */
  99         .irq_dest_mode                  = 1,
 100
 101         .target_cpus                    = default_target_cpus,
 102         .disable_esr                    = 0,
 103         .dest_logical                   = APIC_DEST_LOGICAL,
 104         .check_apicid_used              = default_check_apicid_used,
 105         .check_apicid_present           = default_check_apicid_present,
 106
 107         .vector_allocation_domain       = default_vector_allocation_domain,
 108         .init_apic_ldr                  = default_init_apic_ldr,
 109
 110         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
 111         .setup_apic_routing             = setup_apic_flat_routing,
 112         .multi_timer_check              = NULL,
 113         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 114         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 115         .setup_portio_remap             = NULL,
 116         .check_phys_apicid_present      = default_check_phys_apicid_present,
 117         .enable_apic_mode               = NULL,
 118         .phys_pkg_id                    = default_phys_pkg_id,
 119         .mps_oem_check                  = NULL,
 120
 121         .get_apic_id                    = default_get_apic_id,
 122         .set_apic_id                    = NULL,
 123         .apic_id_mask                   = 0x0F << 24,
 124
 125         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 126         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 127
 128         .send_IPI_mask                  = default_send_IPI_mask_logical,
 129         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
 130         .send_IPI_allbutself            = default_send_IPI_allbutself,
 131         .send_IPI_all                   = default_send_IPI_all,
 132         .send_IPI_self                  = default_send_IPI_self,
 133
 134         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 135         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 136
 137         .wait_for_init_deassert         = default_wait_for_init_deassert,
 138
 139         .smp_callin_clear_local_apic    = NULL,
 140         .inquire_remote_apic            = default_inquire_remote_apic,
 141
 142         .read                           = native_apic_mem_read,
 143         .write                          = native_apic_mem_write,
 144         .icr_read                       = native_apic_icr_read,
 145         .icr_write                      = native_apic_icr_write,
 146         .wait_icr_idle                  = native_apic_wait_icr_idle,
 147         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 148
 149         .x86_32_early_logical_apicid    = default_x86_32_early_logical_apicid,
 150 };
 151
 152 apic_driver(apic_default);
 153
 154 struct apic *apic = &apic_default;
 155 EXPORT_SYMBOL_GPL(apic);
 156
 157 static int cmdline_apic __initdata;
 158 static int __init parse_apic(char *arg)
 159 {
 160         struct apic **drv;
 161
 162         if (!arg)
 163                 return -EINVAL;
 164
 165         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 166                 if (!strcmp((*drv)->name, arg)) {
 167                         apic = *drv;
 168                         cmdline_apic = 1;
 169                         return 0;
 170                 }
 171         }
 172
 173         /* Parsed again by __setup for debug/verbose */
 174         return 0;
 175 }
 176 early_param("apic", parse_apic);
 177
 178 void __init default_setup_apic_routing(void)
 179 {
 180         int version = apic_version[boot_cpu_physical_apicid];
 181
 182         if (num_possible_cpus() > 8) {
 183                 switch (boot_cpu_data.x86_vendor) {
 184                 case X86_VENDOR_INTEL:
 185                         if (!APIC_XAPIC(version)) {
 186                                 def_to_bigsmp = 0;
 187                                 break;
 188                         }
 189                         /* If P4 and above fall through */
 190                 case X86_VENDOR_AMD:
 191                         def_to_bigsmp = 1;
 192                 }
 193         }
 194
 195 #ifdef CONFIG_X86_BIGSMP
 196         /*
 197          * This is used to switch to bigsmp mode when
 198          * - There is no apic= option specified by the user
 199          * - generic_apic_probe() has chosen apic_default as the sub_arch
 200          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
 201          */
 202
 203         if (!cmdline_apic && apic == &apic_default) {
 204                 struct apic *bigsmp = generic_bigsmp_probe();
 205                 if (bigsmp) {
 206                         apic = bigsmp;
 207                         printk(KERN_INFO "Overriding APIC driver with %s\n",
 208                                apic->name);
 209                 }
 210         }
 211 #endif
 212
 213         if (apic->setup_apic_routing)
 214                 apic->setup_apic_routing();
 215 }
 216
 217 void __init generic_apic_probe(void)
 218 {
 219         if (!cmdline_apic) {
 220                 struct apic **drv;
 221
 222                 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 223                         if ((*drv)->probe()) {
 224                                 apic = *drv;
 225                                 break;
 226                         }
 227                 }
 228                 /* Not visible without early console */
 229                 if (drv == __apicdrivers_end)
 230                         panic("Didn't find an APIC driver");
 231         }
 232         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
 233 }
 234
 235 /* These functions can switch the APIC even after the initial ->probe() */
 236
 237 int __init
 238 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
 239 {
 240         struct apic **drv;
 241
 242         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 243                 if (!((*drv)->mps_oem_check))
 244                         continue;
 245                 if (!(*drv)->mps_oem_check(mpc, oem, productid))
 246                         continue;
 247
 248                 if (!cmdline_apic) {
 249                         apic = *drv;
 250                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 251                                apic->name);
 252                 }
 253                 return 1;
 254         }
 255         return 0;
 256 }
 257
 258 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 259 {
 260         struct apic **drv;
 261
 262         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
 263                 if (!(*drv)->acpi_madt_oem_check)
 264                         continue;
 265                 if (!(*drv)->acpi_madt_oem_check(oem_id, oem_table_id))
 266                         continue;
 267
 268                 if (!cmdline_apic) {
 269                         apic = *drv;
 270                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 271                                apic->name);
 272                 }
 273                 return 1;
 274         }
 275         return 0;
 276 }