arch/x86/kernel/irqinit.c

   1 #include <linux/linkage.h>
   2 #include <linux/errno.h>
   3 #include <linux/signal.h>
   4 #include <linux/sched.h>
   5 #include <linux/ioport.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/timex.h>
   8 #include <linux/random.h>
   9 #include <linux/kprobes.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel_stat.h>
  12 #include <linux/device.h>
  13 #include <linux/bitops.h>
  14 #include <linux/acpi.h>
  15 #include <linux/io.h>
  16 #include <linux/delay.h>
  17
  18 #include <linux/atomic.h>
  19 #include <asm/timer.h>
  20 #include <asm/hw_irq.h>
  21 #include <asm/pgtable.h>
  22 #include <asm/desc.h>
  23 #include <asm/apic.h>
  24 #include <asm/setup.h>
  25 #include <asm/i8259.h>
  26 #include <asm/traps.h>
  27 #include <asm/prom.h>
  28
  29 /*
  30  * ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
  31  * (these are usually mapped to vectors 0x30-0x3f)
  32  */
  33
  34 /*
  35  * The IO-APIC gives us many more interrupt sources. Most of these
  36  * are unused but an SMP system is supposed to have enough memory ...
  37  * sometimes (mostly wrt. hw bugs) we get corrupted vectors all
  38  * across the spectrum, so we really want to be prepared to get all
  39  * of these. Plus, more powerful systems might have more than 64
  40  * IO-APIC registers.
  41  *
  42  * (these are usually mapped into the 0x30-0xff vector range)
  43  */
  44
  45 /*
  46  * IRQ2 is cascade interrupt to second interrupt controller
  47  */
  48 static struct irqaction irq2 = {
  49         .handler = no_action,
  50         .name = "cascade",
  51         .flags = IRQF_NO_THREAD,
  52 };
  53
  54 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
  55         [0 ... NR_VECTORS - 1] = -1,
  56 };
  57
  58 int vector_used_by_percpu_irq(unsigned int vector)
  59 {
  60         int cpu;
  61
  62         for_each_online_cpu(cpu) {
  63                 if (per_cpu(vector_irq, cpu)[vector] != -1)
  64                         return 1;
  65         }
  66
  67         return 0;
  68 }
  69
  70 void __init init_ISA_irqs(void)
  71 {
  72         struct irq_chip *chip = legacy_pic->chip;
  73         const char *name = chip->name;
  74         int i;
  75
  76 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
  77         init_bsp_APIC();
  78 #endif
  79         legacy_pic->init(0);
  80
  81         for (i = 0; i < legacy_pic->nr_legacy_irqs; i++)
  82                 irq_set_chip_and_handler_name(i, chip, handle_level_irq, name);
  83 }
  84
  85 void __init init_IRQ(void)
  86 {
  87         int i;
  88
  89         /*
  90          * We probably need a better place for this, but it works for
  91          * now ...
  92          */
  93         x86_add_irq_domains();
  94
  95         /*
  96          * On cpu 0, Assign IRQ0_VECTOR..IRQ15_VECTOR's to IRQ 0..15.
  97          * If these IRQ's are handled by legacy interrupt-controllers like PIC,
  98          * then this configuration will likely be static after the boot. If
  99          * these IRQ's are handled by more mordern controllers like IO-APIC,
 100          * then this vector space can be freed and re-used dynamically as the
 101          * irq's migrate etc.
 102          */
 103         for (i = 0; i < legacy_pic->nr_legacy_irqs; i++)
 104                 per_cpu(vector_irq, 0)[IRQ0_VECTOR + i] = i;
 105
 106         x86_init.irqs.intr_init();
 107 }
 108
 109 /*
 110  * Setup the vector to irq mappings.
 111  */
 112 void setup_vector_irq(int cpu)
 113 {
 114 #ifndef CONFIG_X86_IO_APIC
 115         int irq;
 116
 117         /*
 118          * On most of the platforms, legacy PIC delivers the interrupts on the
 119          * boot cpu. But there are certain platforms where PIC interrupts are
 120          * delivered to multiple cpu's. If the legacy IRQ is handled by the
 121          * legacy PIC, for the new cpu that is coming online, setup the static
 122          * legacy vector to irq mapping:
 123          */
 124         for (irq = 0; irq < legacy_pic->nr_legacy_irqs; irq++)
 125                 per_cpu(vector_irq, cpu)[IRQ0_VECTOR + irq] = irq;
 126 #endif
 127
 128         __setup_vector_irq(cpu);
 129 }
 130
 131 static void __init smp_intr_init(void)
 132 {
 133 #ifdef CONFIG_SMP
 134 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
 135         /*
 136          * The reschedule interrupt is a CPU-to-CPU reschedule-helper
 137          * IPI, driven by wakeup.
 138          */
 139         alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
 140
 141         /* IPI for generic function call */
 142         alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
 143
 144         /* IPI for generic single function call */
 145         alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
 146                         call_function_single_interrupt);
 147
 148         /* Low priority IPI to cleanup after moving an irq */
 149         set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
 150         set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
 151
 152         /* IPI used for rebooting/stopping */
 153         alloc_intr_gate(REBOOT_VECTOR, reboot_interrupt);
 154 #endif
 155 #endif /* CONFIG_SMP */
 156 }
 157
 158 static void __init apic_intr_init(void)
 159 {
 160         smp_intr_init();
 161
 162 #ifdef CONFIG_X86_THERMAL_VECTOR
 163         alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
 164 #endif
 165 #ifdef CONFIG_X86_MCE_THRESHOLD
 166         alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
 167 #endif
 168
 169 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
 170         /* self generated IPI for local APIC timer */
 171         alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
 172
 173         /* IPI for X86 platform specific use */
 174         alloc_intr_gate(X86_PLATFORM_IPI_VECTOR, x86_platform_ipi);
 175 #ifdef CONFIG_HAVE_KVM
 176         /* IPI for KVM to deliver posted interrupt */
 177         alloc_intr_gate(POSTED_INTR_VECTOR, kvm_posted_intr_ipi);
 178 #endif
 179
 180         /* IPI vectors for APIC spurious and error interrupts */
 181         alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
 182         alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 183
 184         /* IRQ work interrupts: */
 185 # ifdef CONFIG_IRQ_WORK
 186         alloc_intr_gate(IRQ_WORK_VECTOR, irq_work_interrupt);
 187 # endif
 188
 189 #endif
 190 }
 191
 192 void __init native_init_IRQ(void)
 193 {
 194         int i;
 195
 196         /* Execute any quirks before the call gates are initialised: */
 197         x86_init.irqs.pre_vector_init();
 198
 199         apic_intr_init();
 200
 201         /*
 202          * Cover the whole vector space, no vector can escape
 203          * us. (some of these will be overridden and become
 204          * 'special' SMP interrupts)
 205          */
 206         i = FIRST_EXTERNAL_VECTOR;
 207         for_each_clear_bit_from(i, used_vectors, NR_VECTORS) {
 208                 /* IA32_SYSCALL_VECTOR could be used in trap_init already. */
 209                 set_intr_gate(i, interrupt[i - FIRST_EXTERNAL_VECTOR]);
 210         }
 211
 212         if (!acpi_ioapic && !of_ioapic)
 213                 setup_irq(2, &irq2);
 214
 215 #ifdef CONFIG_X86_32
 216         irq_ctx_init(smp_processor_id());
 217 #endif
 218 }