release/src-rt-6.x.4708/linux/linux-2.6.36/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 void __init default_setup_apic_routing(void)
  56 {
  57         int version = apic_version[boot_cpu_physical_apicid];
  58
  59         if (num_possible_cpus() > 8) {
  60                 switch (boot_cpu_data.x86_vendor) {
  61                 case X86_VENDOR_INTEL:
  62                         if (!APIC_XAPIC(version)) {
  63                                 def_to_bigsmp = 0;
  64                                 break;
  65                         }
  66                         /* If P4 and above fall through */
  67                 case X86_VENDOR_AMD:
  68                         def_to_bigsmp = 1;
  69                 }
  70         }
  71
  72 #ifdef CONFIG_X86_BIGSMP
  73         generic_bigsmp_probe();
  74 #endif
  75
  76         if (apic->setup_apic_routing)
  77                 apic->setup_apic_routing();
  78 }
  79
  80 static void setup_apic_flat_routing(void)
  81 {
  82 #ifdef CONFIG_X86_IO_APIC
  83         printk(KERN_INFO
  84                 "Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
  85                 nr_ioapics);
  86 #endif
  87 }
  88
  89 static void default_vector_allocation_domain(int cpu, struct cpumask *retmask)
  90 {
  91         /*
  92          * Careful. Some cpus do not strictly honor the set of cpus
  93          * specified in the interrupt destination when using lowest
  94          * priority interrupt delivery mode.
  95          *
  96          * In particular there was a hyperthreading cpu observed to
  97          * deliver interrupts to the wrong hyperthread when only one
  98          * hyperthread was specified in the interrupt desitination.
  99          */
 100         cpumask_clear(retmask);
 101         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
 102 }
 103
 104 /* should be called last. */
 105 static int probe_default(void)
 106 {
 107         return 1;
 108 }
 109
 110 struct apic apic_default = {
 111
 112         .name                           = "default",
 113         .probe                          = probe_default,
 114         .acpi_madt_oem_check            = NULL,
 115         .apic_id_registered             = default_apic_id_registered,
 116
 117         .irq_delivery_mode              = dest_LowestPrio,
 118         /* logical delivery broadcast to all CPUs: */
 119         .irq_dest_mode                  = 1,
 120
 121         .target_cpus                    = default_target_cpus,
 122         .disable_esr                    = 0,
 123         .dest_logical                   = APIC_DEST_LOGICAL,
 124         .check_apicid_used              = default_check_apicid_used,
 125         .check_apicid_present           = default_check_apicid_present,
 126
 127         .vector_allocation_domain       = default_vector_allocation_domain,
 128         .init_apic_ldr                  = default_init_apic_ldr,
 129
 130         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
 131         .setup_apic_routing             = setup_apic_flat_routing,
 132         .multi_timer_check              = NULL,
 133         .apicid_to_node                 = default_apicid_to_node,
 134         .cpu_to_logical_apicid          = default_cpu_to_logical_apicid,
 135         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 136         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 137         .setup_portio_remap             = NULL,
 138         .check_phys_apicid_present      = default_check_phys_apicid_present,
 139         .enable_apic_mode               = NULL,
 140         .phys_pkg_id                    = default_phys_pkg_id,
 141         .mps_oem_check                  = NULL,
 142
 143         .get_apic_id                    = default_get_apic_id,
 144         .set_apic_id                    = NULL,
 145         .apic_id_mask                   = 0x0F << 24,
 146
 147         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 148         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 149
 150         .send_IPI_mask                  = default_send_IPI_mask_logical,
 151         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
 152         .send_IPI_allbutself            = default_send_IPI_allbutself,
 153         .send_IPI_all                   = default_send_IPI_all,
 154         .send_IPI_self                  = default_send_IPI_self,
 155
 156         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 157         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 158
 159         .wait_for_init_deassert         = default_wait_for_init_deassert,
 160
 161         .smp_callin_clear_local_apic    = NULL,
 162         .inquire_remote_apic            = default_inquire_remote_apic,
 163
 164         .read                           = native_apic_mem_read,
 165         .write                          = native_apic_mem_write,
 166         .icr_read                       = native_apic_icr_read,
 167         .icr_write                      = native_apic_icr_write,
 168         .wait_icr_idle                  = native_apic_wait_icr_idle,
 169         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 170 };
 171
 172 extern struct apic apic_numaq;
 173 extern struct apic apic_summit;
 174 extern struct apic apic_bigsmp;
 175 extern struct apic apic_es7000;
 176 extern struct apic apic_es7000_cluster;
 177
 178 struct apic *apic = &apic_default;
 179 EXPORT_SYMBOL_GPL(apic);
 180
 181 static struct apic *apic_probe[] __initdata = {
 182 #ifdef CONFIG_X86_NUMAQ
 183         &apic_numaq,
 184 #endif
 185 #ifdef CONFIG_X86_SUMMIT
 186         &apic_summit,
 187 #endif
 188 #ifdef CONFIG_X86_BIGSMP
 189         &apic_bigsmp,
 190 #endif
 191 #ifdef CONFIG_X86_ES7000
 192         &apic_es7000,
 193         &apic_es7000_cluster,
 194 #endif
 195         &apic_default,  /* must be last */
 196         NULL,
 197 };
 198
 199 static int cmdline_apic __initdata;
 200 static int __init parse_apic(char *arg)
 201 {
 202         int i;
 203
 204         if (!arg)
 205                 return -EINVAL;
 206
 207         for (i = 0; apic_probe[i]; i++) {
 208                 if (!strcmp(apic_probe[i]->name, arg)) {
 209                         apic = apic_probe[i];
 210                         cmdline_apic = 1;
 211                         return 0;
 212                 }
 213         }
 214
 215         /* Parsed again by __setup for debug/verbose */
 216         return 0;
 217 }
 218 early_param("apic", parse_apic);
 219
 220 void __init generic_bigsmp_probe(void)
 221 {
 222 #ifdef CONFIG_X86_BIGSMP
 223         /*
 224          * This routine is used to switch to bigsmp mode when
 225          * - There is no apic= option specified by the user
 226          * - generic_apic_probe() has chosen apic_default as the sub_arch
 227          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
 228          */
 229
 230         if (!cmdline_apic && apic == &apic_default) {
 231                 if (apic_bigsmp.probe()) {
 232                         apic = &apic_bigsmp;
 233                         printk(KERN_INFO "Overriding APIC driver with %s\n",
 234                                apic->name);
 235                 }
 236         }
 237 #endif
 238 }
 239
 240 void __init generic_apic_probe(void)
 241 {
 242         if (!cmdline_apic) {
 243                 int i;
 244                 for (i = 0; apic_probe[i]; i++) {
 245                         if (apic_probe[i]->probe()) {
 246                                 apic = apic_probe[i];
 247                                 break;
 248                         }
 249                 }
 250                 /* Not visible without early console */
 251                 if (!apic_probe[i])
 252                         panic("Didn't find an APIC driver");
 253         }
 254         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
 255 }
 256
 257 /* These functions can switch the APIC even after the initial ->probe() */
 258
 259 int __init
 260 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
 261 {
 262         int i;
 263
 264         for (i = 0; apic_probe[i]; ++i) {
 265                 if (!apic_probe[i]->mps_oem_check)
 266                         continue;
 267                 if (!apic_probe[i]->mps_oem_check(mpc, oem, productid))
 268                         continue;
 269
 270                 if (!cmdline_apic) {
 271                         apic = apic_probe[i];
 272                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 273                                apic->name);
 274                 }
 275                 return 1;
 276         }
 277         return 0;
 278 }
 279
 280 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 281 {
 282         int i;
 283
 284         for (i = 0; apic_probe[i]; ++i) {
 285                 if (!apic_probe[i]->acpi_madt_oem_check)
 286                         continue;
 287                 if (!apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id))
 288                         continue;
 289
 290                 if (!cmdline_apic) {
 291                         apic = apic_probe[i];
 292                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 293                                apic->name);
 294                 }
 295                 return 1;
 296         }
 297         return 0;
 298 }