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/threads.h>
  24 #include <linux/cpumask.h>
  25 #include <asm/mpspec.h>
  26 #include <asm/fixmap.h>
  27 #include <asm/apicdef.h>
  28 #include <linux/kernel.h>
  29 #include <linux/string.h>
  30 #include <linux/smp.h>
  31 #include <linux/init.h>
  32 #include <asm/ipi.h>
  33
  34 #include <linux/smp.h>
  35 #include <linux/init.h>
  36 #include <linux/interrupt.h>
  37 #include <asm/acpi.h>
  38 #include <asm/e820.h>
  39 #include <asm/setup.h>
  40
  41 #ifdef CONFIG_HOTPLUG_CPU
  42 #define DEFAULT_SEND_IPI        (1)
  43 #else
  44 #define DEFAULT_SEND_IPI        (0)
  45 #endif
  46
  47 int no_broadcast = DEFAULT_SEND_IPI;
  48
  49 static __init int no_ipi_broadcast(char *str)
  50 {
  51         get_option(&str, &no_broadcast);
  52         pr_info("Using %s mode\n",
  53                 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
  54         return 1;
  55 }
  56 __setup("no_ipi_broadcast=", no_ipi_broadcast);
  57
  58 static int __init print_ipi_mode(void)
  59 {
  60         pr_info("Using IPI %s mode\n",
  61                 no_broadcast ? "No-Shortcut" : "Shortcut");
  62         return 0;
  63 }
  64 late_initcall(print_ipi_mode);
  65
  66 void default_setup_apic_routing(void)
  67 {
  68 #ifdef CONFIG_X86_IO_APIC
  69         printk(KERN_INFO
  70                 "Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
  71                 nr_ioapics);
  72 #endif
  73 }
  74
  75 static void default_vector_allocation_domain(int cpu, struct cpumask *retmask)
  76 {
  77         /*
  78          * Careful. Some cpus do not strictly honor the set of cpus
  79          * specified in the interrupt destination when using lowest
  80          * priority interrupt delivery mode.
  81          *
  82          * In particular there was a hyperthreading cpu observed to
  83          * deliver interrupts to the wrong hyperthread when only one
  84          * hyperthread was specified in the interrupt desitination.
  85          */
  86         cpumask_clear(retmask);
  87         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
  88 }
  89
  90 /* should be called last. */
  91 static int probe_default(void)
  92 {
  93         return 1;
  94 }
  95
  96 struct apic apic_default = {
  97
  98         .name                           = "default",
  99         .probe                          = probe_default,
 100         .acpi_madt_oem_check            = NULL,
 101         .apic_id_registered             = default_apic_id_registered,
 102
 103         .irq_delivery_mode              = dest_LowestPrio,
 104         /* logical delivery broadcast to all CPUs: */
 105         .irq_dest_mode                  = 1,
 106
 107         .target_cpus                    = default_target_cpus,
 108         .disable_esr                    = 0,
 109         .dest_logical                   = APIC_DEST_LOGICAL,
 110         .check_apicid_used              = default_check_apicid_used,
 111         .check_apicid_present           = default_check_apicid_present,
 112
 113         .vector_allocation_domain       = default_vector_allocation_domain,
 114         .init_apic_ldr                  = default_init_apic_ldr,
 115
 116         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
 117         .setup_apic_routing             = default_setup_apic_routing,
 118         .multi_timer_check              = NULL,
 119         .apicid_to_node                 = default_apicid_to_node,
 120         .cpu_to_logical_apicid          = default_cpu_to_logical_apicid,
 121         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 122         .apicid_to_cpu_present          = default_apicid_to_cpu_present,
 123         .setup_portio_remap             = NULL,
 124         .check_phys_apicid_present      = default_check_phys_apicid_present,
 125         .enable_apic_mode               = NULL,
 126         .phys_pkg_id                    = default_phys_pkg_id,
 127         .mps_oem_check                  = NULL,
 128
 129         .get_apic_id                    = default_get_apic_id,
 130         .set_apic_id                    = NULL,
 131         .apic_id_mask                   = 0x0F << 24,
 132
 133         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 134         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 135
 136         .send_IPI_mask                  = default_send_IPI_mask_logical,
 137         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
 138         .send_IPI_allbutself            = default_send_IPI_allbutself,
 139         .send_IPI_all                   = default_send_IPI_all,
 140         .send_IPI_self                  = default_send_IPI_self,
 141
 142         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 143         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 144
 145         .wait_for_init_deassert         = default_wait_for_init_deassert,
 146
 147         .smp_callin_clear_local_apic    = NULL,
 148         .inquire_remote_apic            = default_inquire_remote_apic,
 149
 150         .read                           = native_apic_mem_read,
 151         .write                          = native_apic_mem_write,
 152         .icr_read                       = native_apic_icr_read,
 153         .icr_write                      = native_apic_icr_write,
 154         .wait_icr_idle                  = native_apic_wait_icr_idle,
 155         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 156 };
 157
 158 extern struct apic apic_numaq;
 159 extern struct apic apic_summit;
 160 extern struct apic apic_bigsmp;
 161 extern struct apic apic_es7000;
 162 extern struct apic apic_es7000_cluster;
 163 extern struct apic apic_default;
 164
 165 struct apic *apic = &apic_default;
 166 EXPORT_SYMBOL_GPL(apic);
 167
 168 static struct apic *apic_probe[] __initdata = {
 169 #ifdef CONFIG_X86_NUMAQ
 170         &apic_numaq,
 171 #endif
 172 #ifdef CONFIG_X86_SUMMIT
 173         &apic_summit,
 174 #endif
 175 #ifdef CONFIG_X86_BIGSMP
 176         &apic_bigsmp,
 177 #endif
 178 #ifdef CONFIG_X86_ES7000
 179         &apic_es7000,
 180         &apic_es7000_cluster,
 181 #endif
 182         &apic_default,  /* must be last */
 183         NULL,
 184 };
 185
 186 static int cmdline_apic __initdata;
 187 static int __init parse_apic(char *arg)
 188 {
 189         int i;
 190
 191         if (!arg)
 192                 return -EINVAL;
 193
 194         for (i = 0; apic_probe[i]; i++) {
 195                 if (!strcmp(apic_probe[i]->name, arg)) {
 196                         apic = apic_probe[i];
 197                         cmdline_apic = 1;
 198                         return 0;
 199                 }
 200         }
 201
 202         /* Parsed again by __setup for debug/verbose */
 203         return 0;
 204 }
 205 early_param("apic", parse_apic);
 206
 207 void __init generic_bigsmp_probe(void)
 208 {
 209 #ifdef CONFIG_X86_BIGSMP
 210         /*
 211          * This routine is used to switch to bigsmp mode when
 212          * - There is no apic= option specified by the user
 213          * - generic_apic_probe() has chosen apic_default as the sub_arch
 214          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
 215          */
 216
 217         if (!cmdline_apic && apic == &apic_default) {
 218                 if (apic_bigsmp.probe()) {
 219                         apic = &apic_bigsmp;
 220                         printk(KERN_INFO "Overriding APIC driver with %s\n",
 221                                apic->name);
 222                 }
 223         }
 224 #endif
 225 }
 226
 227 void __init generic_apic_probe(void)
 228 {
 229         if (!cmdline_apic) {
 230                 int i;
 231                 for (i = 0; apic_probe[i]; i++) {
 232                         if (apic_probe[i]->probe()) {
 233                                 apic = apic_probe[i];
 234                                 break;
 235                         }
 236                 }
 237                 /* Not visible without early console */
 238                 if (!apic_probe[i])
 239                         panic("Didn't find an APIC driver");
 240         }
 241         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
 242 }
 243
 244 /* These functions can switch the APIC even after the initial ->probe() */
 245
 246 int __init
 247 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
 248 {
 249         int i;
 250
 251         for (i = 0; apic_probe[i]; ++i) {
 252                 if (!apic_probe[i]->mps_oem_check)
 253                         continue;
 254                 if (!apic_probe[i]->mps_oem_check(mpc, oem, productid))
 255                         continue;
 256
 257                 if (!cmdline_apic) {
 258                         apic = apic_probe[i];
 259                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 260                                apic->name);
 261                 }
 262                 return 1;
 263         }
 264         return 0;
 265 }
 266
 267 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 268 {
 269         int i;
 270
 271         for (i = 0; apic_probe[i]; ++i) {
 272                 if (!apic_probe[i]->acpi_madt_oem_check)
 273                         continue;
 274                 if (!apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id))
 275                         continue;
 276
 277                 if (!cmdline_apic) {
 278                         apic = apic_probe[i];
 279                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 280                                apic->name);
 281                 }
 282                 return 1;
 283         }
 284         return 0;
 285 }