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   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 default_setup_apic_routing(void)
  56 {
  57 #ifdef CONFIG_X86_IO_APIC
  58         printk(KERN_INFO
  59                 "Enabling APIC mode:  Flat.  Using %d I/O APICs\n",
  60                 nr_ioapics);
  61 #endif
  62 }
  63
  64 static void default_vector_allocation_domain(int cpu, struct cpumask *retmask)
  65 {
  66         /*
  67          * Careful. Some cpus do not strictly honor the set of cpus
  68          * specified in the interrupt destination when using lowest
  69          * priority interrupt delivery mode.
  70          *
  71          * In particular there was a hyperthreading cpu observed to
  72          * deliver interrupts to the wrong hyperthread when only one
  73          * hyperthread was specified in the interrupt desitination.
  74          */
  75         cpumask_clear(retmask);
  76         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
  77 }
  78
  79 /* should be called last. */
  80 static int probe_default(void)
  81 {
  82         return 1;
  83 }
  84
  85 struct apic apic_default = {
  86
  87         .name                           = "default",
  88         .probe                          = probe_default,
  89         .acpi_madt_oem_check            = NULL,
  90         .apic_id_registered             = default_apic_id_registered,
  91
  92         .irq_delivery_mode              = dest_LowestPrio,
  93         /* logical delivery broadcast to all CPUs: */
  94         .irq_dest_mode                  = 1,
  95
  96         .target_cpus                    = default_target_cpus,
  97         .disable_esr                    = 0,
  98         .dest_logical                   = APIC_DEST_LOGICAL,
  99         .check_apicid_used              = default_check_apicid_used,
 100         .check_apicid_present           = default_check_apicid_present,
 101
 102         .vector_allocation_domain       = default_vector_allocation_domain,
 103         .init_apic_ldr                  = default_init_apic_ldr,
 104
 105         .ioapic_phys_id_map             = default_ioapic_phys_id_map,
 106         .setup_apic_routing             = default_setup_apic_routing,
 107         .multi_timer_check              = NULL,
 108         .apicid_to_node                 = default_apicid_to_node,
 109         .cpu_to_logical_apicid          = default_cpu_to_logical_apicid,
 110         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 111         .apicid_to_cpu_present          = default_apicid_to_cpu_present,
 112         .setup_portio_remap             = NULL,
 113         .check_phys_apicid_present      = default_check_phys_apicid_present,
 114         .enable_apic_mode               = NULL,
 115         .phys_pkg_id                    = default_phys_pkg_id,
 116         .mps_oem_check                  = NULL,
 117
 118         .get_apic_id                    = default_get_apic_id,
 119         .set_apic_id                    = NULL,
 120         .apic_id_mask                   = 0x0F << 24,
 121
 122         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 123         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 124
 125         .send_IPI_mask                  = default_send_IPI_mask_logical,
 126         .send_IPI_mask_allbutself       = default_send_IPI_mask_allbutself_logical,
 127         .send_IPI_allbutself            = default_send_IPI_allbutself,
 128         .send_IPI_all                   = default_send_IPI_all,
 129         .send_IPI_self                  = default_send_IPI_self,
 130
 131         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 132         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 133
 134         .wait_for_init_deassert         = default_wait_for_init_deassert,
 135
 136         .smp_callin_clear_local_apic    = NULL,
 137         .inquire_remote_apic            = default_inquire_remote_apic,
 138
 139         .read                           = native_apic_mem_read,
 140         .write                          = native_apic_mem_write,
 141         .icr_read                       = native_apic_icr_read,
 142         .icr_write                      = native_apic_icr_write,
 143         .wait_icr_idle                  = native_apic_wait_icr_idle,
 144         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 145 };
 146
 147 extern struct apic apic_numaq;
 148 extern struct apic apic_summit;
 149 extern struct apic apic_bigsmp;
 150 extern struct apic apic_es7000;
 151 extern struct apic apic_es7000_cluster;
 152
 153 struct apic *apic = &apic_default;
 154 EXPORT_SYMBOL_GPL(apic);
 155
 156 static struct apic *apic_probe[] __initdata = {
 157 #ifdef CONFIG_X86_NUMAQ
 158         &apic_numaq,
 159 #endif
 160 #ifdef CONFIG_X86_SUMMIT
 161         &apic_summit,
 162 #endif
 163 #ifdef CONFIG_X86_BIGSMP
 164         &apic_bigsmp,
 165 #endif
 166 #ifdef CONFIG_X86_ES7000
 167         &apic_es7000,
 168         &apic_es7000_cluster,
 169 #endif
 170         &apic_default,  /* must be last */
 171         NULL,
 172 };
 173
 174 static int cmdline_apic __initdata;
 175 static int __init parse_apic(char *arg)
 176 {
 177         int i;
 178
 179         if (!arg)
 180                 return -EINVAL;
 181
 182         for (i = 0; apic_probe[i]; i++) {
 183                 if (!strcmp(apic_probe[i]->name, arg)) {
 184                         apic = apic_probe[i];
 185                         cmdline_apic = 1;
 186                         return 0;
 187                 }
 188         }
 189
 190         /* Parsed again by __setup for debug/verbose */
 191         return 0;
 192 }
 193 early_param("apic", parse_apic);
 194
 195 void __init generic_bigsmp_probe(void)
 196 {
 197 #ifdef CONFIG_X86_BIGSMP
 198         /*
 199          * This routine 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                 if (apic_bigsmp.probe()) {
 207                         apic = &apic_bigsmp;
 208                         printk(KERN_INFO "Overriding APIC driver with %s\n",
 209                                apic->name);
 210                 }
 211         }
 212 #endif
 213 }
 214
 215 void __init generic_apic_probe(void)
 216 {
 217         if (!cmdline_apic) {
 218                 int i;
 219                 for (i = 0; apic_probe[i]; i++) {
 220                         if (apic_probe[i]->probe()) {
 221                                 apic = apic_probe[i];
 222                                 break;
 223                         }
 224                 }
 225                 /* Not visible without early console */
 226                 if (!apic_probe[i])
 227                         panic("Didn't find an APIC driver");
 228         }
 229         printk(KERN_INFO "Using APIC driver %s\n", apic->name);
 230 }
 231
 232 /* These functions can switch the APIC even after the initial ->probe() */
 233
 234 int __init
 235 generic_mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
 236 {
 237         int i;
 238
 239         for (i = 0; apic_probe[i]; ++i) {
 240                 if (!apic_probe[i]->mps_oem_check)
 241                         continue;
 242                 if (!apic_probe[i]->mps_oem_check(mpc, oem, productid))
 243                         continue;
 244
 245                 if (!cmdline_apic) {
 246                         apic = apic_probe[i];
 247                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 248                                apic->name);
 249                 }
 250                 return 1;
 251         }
 252         return 0;
 253 }
 254
 255 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 256 {
 257         int i;
 258
 259         for (i = 0; apic_probe[i]; ++i) {
 260                 if (!apic_probe[i]->acpi_madt_oem_check)
 261                         continue;
 262                 if (!apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id))
 263                         continue;
 264
 265                 if (!cmdline_apic) {
 266                         apic = apic_probe[i];
 267                         printk(KERN_INFO "Switched to APIC driver `%s'.\n",
 268                                apic->name);
 269                 }
 270                 return 1;
 271         }
 272         return 0;
 273 }