55f05ffaa7
Since we only support PCI and ISA legacy busses now there is no need to have an full array with checking. Signed-off-by: Andi Kleen <ak@suse.de>
1860 lines
46 KiB
C
1860 lines
46 KiB
C
/*
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* Intel IO-APIC support for multi-Pentium hosts.
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*
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* Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
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*
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* Many thanks to Stig Venaas for trying out countless experimental
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* patches and reporting/debugging problems patiently!
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*
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* (c) 1999, Multiple IO-APIC support, developed by
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* Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
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* Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
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* further tested and cleaned up by Zach Brown <zab@redhat.com>
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* and Ingo Molnar <mingo@redhat.com>
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*
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* Fixes
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* Maciej W. Rozycki : Bits for genuine 82489DX APICs;
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* thanks to Eric Gilmore
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* and Rolf G. Tews
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* for testing these extensively
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* Paul Diefenbaugh : Added full ACPI support
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*/
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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#include <linux/mc146818rtc.h>
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#include <linux/acpi.h>
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#include <linux/sysdev.h>
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#ifdef CONFIG_ACPI
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#include <acpi/acpi_bus.h>
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#endif
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <asm/desc.h>
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#include <asm/proto.h>
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#include <asm/mach_apic.h>
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#include <asm/acpi.h>
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#include <asm/dma.h>
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#include <asm/nmi.h>
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#define __apicdebuginit __init
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int sis_apic_bug; /* not actually supported, dummy for compile */
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static int no_timer_check;
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int disable_timer_pin_1 __initdata;
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int timer_over_8254 __initdata = 0;
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/* Where if anywhere is the i8259 connect in external int mode */
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static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
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static DEFINE_SPINLOCK(ioapic_lock);
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static DEFINE_SPINLOCK(vector_lock);
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/*
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* # of IRQ routing registers
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*/
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int nr_ioapic_registers[MAX_IO_APICS];
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/*
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* Rough estimation of how many shared IRQs there are, can
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* be changed anytime.
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*/
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#define MAX_PLUS_SHARED_IRQS NR_IRQ_VECTORS
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#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
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/*
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* This is performance-critical, we want to do it O(1)
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*
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* the indexing order of this array favors 1:1 mappings
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* between pins and IRQs.
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*/
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static struct irq_pin_list {
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short apic, pin, next;
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} irq_2_pin[PIN_MAP_SIZE];
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int vector_irq[NR_VECTORS] __read_mostly = { [0 ... NR_VECTORS - 1] = -1};
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#ifdef CONFIG_PCI_MSI
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#define vector_to_irq(vector) \
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(platform_legacy_irq(vector) ? vector : vector_irq[vector])
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#else
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#define vector_to_irq(vector) (vector)
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#endif
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#define __DO_ACTION(R, ACTION, FINAL) \
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\
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{ \
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int pin; \
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struct irq_pin_list *entry = irq_2_pin + irq; \
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\
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BUG_ON(irq >= NR_IRQS); \
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for (;;) { \
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unsigned int reg; \
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pin = entry->pin; \
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if (pin == -1) \
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break; \
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reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
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reg ACTION; \
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io_apic_modify(entry->apic, reg); \
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if (!entry->next) \
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break; \
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entry = irq_2_pin + entry->next; \
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} \
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FINAL; \
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}
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union entry_union {
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struct { u32 w1, w2; };
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struct IO_APIC_route_entry entry;
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};
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static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
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{
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union entry_union eu;
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unsigned long flags;
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spin_lock_irqsave(&ioapic_lock, flags);
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eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
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eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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return eu.entry;
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}
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static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
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{
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unsigned long flags;
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union entry_union eu;
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eu.entry = e;
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spin_lock_irqsave(&ioapic_lock, flags);
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io_apic_write(apic, 0x10 + 2*pin, eu.w1);
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io_apic_write(apic, 0x11 + 2*pin, eu.w2);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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#ifdef CONFIG_SMP
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static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
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{
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unsigned long flags;
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unsigned int dest;
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cpumask_t tmp;
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cpus_and(tmp, mask, cpu_online_map);
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if (cpus_empty(tmp))
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tmp = TARGET_CPUS;
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cpus_and(mask, tmp, CPU_MASK_ALL);
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dest = cpu_mask_to_apicid(mask);
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/*
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* Only the high 8 bits are valid.
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*/
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dest = SET_APIC_LOGICAL_ID(dest);
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spin_lock_irqsave(&ioapic_lock, flags);
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__DO_ACTION(1, = dest, )
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set_irq_info(irq, mask);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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#endif
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static u8 gsi_2_irq[NR_IRQ_VECTORS] = { [0 ... NR_IRQ_VECTORS-1] = 0xFF };
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/*
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* The common case is 1:1 IRQ<->pin mappings. Sometimes there are
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* shared ISA-space IRQs, so we have to support them. We are super
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* fast in the common case, and fast for shared ISA-space IRQs.
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*/
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static void add_pin_to_irq(unsigned int irq, int apic, int pin)
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{
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static int first_free_entry = NR_IRQS;
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struct irq_pin_list *entry = irq_2_pin + irq;
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BUG_ON(irq >= NR_IRQS);
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while (entry->next)
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entry = irq_2_pin + entry->next;
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if (entry->pin != -1) {
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entry->next = first_free_entry;
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entry = irq_2_pin + entry->next;
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if (++first_free_entry >= PIN_MAP_SIZE)
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panic("io_apic.c: ran out of irq_2_pin entries!");
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}
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entry->apic = apic;
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entry->pin = pin;
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}
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#define DO_ACTION(name,R,ACTION, FINAL) \
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\
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static void name##_IO_APIC_irq (unsigned int irq) \
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__DO_ACTION(R, ACTION, FINAL)
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DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) )
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/* mask = 1 */
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DO_ACTION( __unmask, 0, &= 0xfffeffff, )
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/* mask = 0 */
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static void mask_IO_APIC_irq (unsigned int irq)
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{
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unsigned long flags;
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spin_lock_irqsave(&ioapic_lock, flags);
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__mask_IO_APIC_irq(irq);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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static void unmask_IO_APIC_irq (unsigned int irq)
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{
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unsigned long flags;
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spin_lock_irqsave(&ioapic_lock, flags);
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__unmask_IO_APIC_irq(irq);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
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{
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struct IO_APIC_route_entry entry;
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/* Check delivery_mode to be sure we're not clearing an SMI pin */
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entry = ioapic_read_entry(apic, pin);
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if (entry.delivery_mode == dest_SMI)
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return;
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/*
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* Disable it in the IO-APIC irq-routing table:
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*/
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memset(&entry, 0, sizeof(entry));
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entry.mask = 1;
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ioapic_write_entry(apic, pin, entry);
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}
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static void clear_IO_APIC (void)
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{
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int apic, pin;
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for (apic = 0; apic < nr_ioapics; apic++)
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for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
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clear_IO_APIC_pin(apic, pin);
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}
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int skip_ioapic_setup;
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int ioapic_force;
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/* dummy parsing: see setup.c */
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static int __init disable_ioapic_setup(char *str)
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{
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skip_ioapic_setup = 1;
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return 1;
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}
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static int __init enable_ioapic_setup(char *str)
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{
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ioapic_force = 1;
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skip_ioapic_setup = 0;
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return 1;
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}
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__setup("noapic", disable_ioapic_setup);
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__setup("apic", enable_ioapic_setup);
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static int __init setup_disable_8254_timer(char *s)
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{
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timer_over_8254 = -1;
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return 1;
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}
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static int __init setup_enable_8254_timer(char *s)
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{
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timer_over_8254 = 2;
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return 1;
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}
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__setup("disable_8254_timer", setup_disable_8254_timer);
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__setup("enable_8254_timer", setup_enable_8254_timer);
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/*
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* Find the IRQ entry number of a certain pin.
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*/
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static int find_irq_entry(int apic, int pin, int type)
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{
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int i;
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for (i = 0; i < mp_irq_entries; i++)
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if (mp_irqs[i].mpc_irqtype == type &&
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(mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
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mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
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mp_irqs[i].mpc_dstirq == pin)
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return i;
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return -1;
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}
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/*
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* Find the pin to which IRQ[irq] (ISA) is connected
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*/
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static int __init find_isa_irq_pin(int irq, int type)
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{
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int i;
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for (i = 0; i < mp_irq_entries; i++) {
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int lbus = mp_irqs[i].mpc_srcbus;
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if (test_bit(lbus, mp_bus_not_pci) &&
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(mp_irqs[i].mpc_irqtype == type) &&
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(mp_irqs[i].mpc_srcbusirq == irq))
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return mp_irqs[i].mpc_dstirq;
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}
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return -1;
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}
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static int __init find_isa_irq_apic(int irq, int type)
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{
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int i;
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for (i = 0; i < mp_irq_entries; i++) {
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int lbus = mp_irqs[i].mpc_srcbus;
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if (test_bit(lbus, mp_bus_not_pci) &&
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(mp_irqs[i].mpc_irqtype == type) &&
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(mp_irqs[i].mpc_srcbusirq == irq))
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break;
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}
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if (i < mp_irq_entries) {
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int apic;
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for(apic = 0; apic < nr_ioapics; apic++) {
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if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
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return apic;
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}
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}
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return -1;
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}
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/*
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* Find a specific PCI IRQ entry.
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* Not an __init, possibly needed by modules
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*/
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static int pin_2_irq(int idx, int apic, int pin);
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int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
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{
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int apic, i, best_guess = -1;
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apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
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bus, slot, pin);
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if (mp_bus_id_to_pci_bus[bus] == -1) {
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apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
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return -1;
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}
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for (i = 0; i < mp_irq_entries; i++) {
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int lbus = mp_irqs[i].mpc_srcbus;
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for (apic = 0; apic < nr_ioapics; apic++)
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if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
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mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
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break;
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if (!test_bit(lbus, mp_bus_not_pci) &&
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!mp_irqs[i].mpc_irqtype &&
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(bus == lbus) &&
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(slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
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int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
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if (!(apic || IO_APIC_IRQ(irq)))
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continue;
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if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
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return irq;
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/*
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* Use the first all-but-pin matching entry as a
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* best-guess fuzzy result for broken mptables.
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*/
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if (best_guess < 0)
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best_guess = irq;
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}
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}
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BUG_ON(best_guess >= NR_IRQS);
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return best_guess;
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}
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/* ISA interrupts are always polarity zero edge triggered,
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* when listed as conforming in the MP table. */
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#define default_ISA_trigger(idx) (0)
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#define default_ISA_polarity(idx) (0)
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/* PCI interrupts are always polarity one level triggered,
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* when listed as conforming in the MP table. */
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#define default_PCI_trigger(idx) (1)
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#define default_PCI_polarity(idx) (1)
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static int __init MPBIOS_polarity(int idx)
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{
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int bus = mp_irqs[idx].mpc_srcbus;
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int polarity;
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/*
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* Determine IRQ line polarity (high active or low active):
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*/
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switch (mp_irqs[idx].mpc_irqflag & 3)
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{
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case 0: /* conforms, ie. bus-type dependent polarity */
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if (test_bit(bus, mp_bus_not_pci))
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polarity = default_ISA_polarity(idx);
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else
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polarity = default_PCI_polarity(idx);
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break;
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case 1: /* high active */
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{
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polarity = 0;
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break;
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}
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case 2: /* reserved */
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{
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printk(KERN_WARNING "broken BIOS!!\n");
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polarity = 1;
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break;
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}
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case 3: /* low active */
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{
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polarity = 1;
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break;
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}
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default: /* invalid */
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{
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printk(KERN_WARNING "broken BIOS!!\n");
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polarity = 1;
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break;
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}
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}
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return polarity;
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}
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static int MPBIOS_trigger(int idx)
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{
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int bus = mp_irqs[idx].mpc_srcbus;
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int trigger;
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/*
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* Determine IRQ trigger mode (edge or level sensitive):
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*/
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switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
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{
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case 0: /* conforms, ie. bus-type dependent */
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if (test_bit(bus, mp_bus_not_pci))
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trigger = default_ISA_trigger(idx);
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else
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trigger = default_PCI_trigger(idx);
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break;
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case 1: /* edge */
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{
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trigger = 0;
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break;
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}
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case 2: /* reserved */
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{
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printk(KERN_WARNING "broken BIOS!!\n");
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trigger = 1;
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break;
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}
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case 3: /* level */
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{
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trigger = 1;
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break;
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}
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default: /* invalid */
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{
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printk(KERN_WARNING "broken BIOS!!\n");
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trigger = 0;
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break;
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}
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}
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return trigger;
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}
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static inline int irq_polarity(int idx)
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{
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return MPBIOS_polarity(idx);
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}
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static inline int irq_trigger(int idx)
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{
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return MPBIOS_trigger(idx);
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}
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static int next_irq = 16;
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/*
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* gsi_irq_sharing -- Name overload! "irq" can be either a legacy IRQ
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* in the range 0-15, a linux IRQ in the range 0-223, or a GSI number
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* from ACPI, which can reach 800 in large boxen.
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*
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* Compact the sparse GSI space into a sequential IRQ series and reuse
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* vectors if possible.
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*/
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int gsi_irq_sharing(int gsi)
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{
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int i, tries, vector;
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BUG_ON(gsi >= NR_IRQ_VECTORS);
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if (platform_legacy_irq(gsi))
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return gsi;
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if (gsi_2_irq[gsi] != 0xFF)
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return (int)gsi_2_irq[gsi];
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|
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tries = NR_IRQS;
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try_again:
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vector = assign_irq_vector(gsi);
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/*
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* Sharing vectors means sharing IRQs, so scan irq_vectors for previous
|
|
* use of vector and if found, return that IRQ. However, we never want
|
|
* to share legacy IRQs, which usually have a different trigger mode
|
|
* than PCI.
|
|
*/
|
|
for (i = 0; i < NR_IRQS; i++)
|
|
if (IO_APIC_VECTOR(i) == vector)
|
|
break;
|
|
if (platform_legacy_irq(i)) {
|
|
if (--tries >= 0) {
|
|
IO_APIC_VECTOR(i) = 0;
|
|
goto try_again;
|
|
}
|
|
panic("gsi_irq_sharing: didn't find an IRQ using vector 0x%02X for GSI %d", vector, gsi);
|
|
}
|
|
if (i < NR_IRQS) {
|
|
gsi_2_irq[gsi] = i;
|
|
printk(KERN_INFO "GSI %d sharing vector 0x%02X and IRQ %d\n",
|
|
gsi, vector, i);
|
|
return i;
|
|
}
|
|
|
|
i = next_irq++;
|
|
BUG_ON(i >= NR_IRQS);
|
|
gsi_2_irq[gsi] = i;
|
|
IO_APIC_VECTOR(i) = vector;
|
|
printk(KERN_INFO "GSI %d assigned vector 0x%02X and IRQ %d\n",
|
|
gsi, vector, i);
|
|
return i;
|
|
}
|
|
|
|
static int pin_2_irq(int idx, int apic, int pin)
|
|
{
|
|
int irq, i;
|
|
int bus = mp_irqs[idx].mpc_srcbus;
|
|
|
|
/*
|
|
* Debugging check, we are in big trouble if this message pops up!
|
|
*/
|
|
if (mp_irqs[idx].mpc_dstirq != pin)
|
|
printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
|
|
|
|
if (test_bit(bus, mp_bus_not_pci)) {
|
|
irq = mp_irqs[idx].mpc_srcbusirq;
|
|
} else {
|
|
/*
|
|
* PCI IRQs are mapped in order
|
|
*/
|
|
i = irq = 0;
|
|
while (i < apic)
|
|
irq += nr_ioapic_registers[i++];
|
|
irq += pin;
|
|
irq = gsi_irq_sharing(irq);
|
|
}
|
|
BUG_ON(irq >= NR_IRQS);
|
|
return irq;
|
|
}
|
|
|
|
static inline int IO_APIC_irq_trigger(int irq)
|
|
{
|
|
int apic, idx, pin;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
|
|
idx = find_irq_entry(apic,pin,mp_INT);
|
|
if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))
|
|
return irq_trigger(idx);
|
|
}
|
|
}
|
|
/*
|
|
* nonexistent IRQs are edge default
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
|
|
u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
|
|
|
|
int assign_irq_vector(int irq)
|
|
{
|
|
static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
|
|
unsigned long flags;
|
|
int vector;
|
|
|
|
BUG_ON(irq != AUTO_ASSIGN && (unsigned)irq >= NR_IRQ_VECTORS);
|
|
|
|
spin_lock_irqsave(&vector_lock, flags);
|
|
|
|
if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0) {
|
|
spin_unlock_irqrestore(&vector_lock, flags);
|
|
return IO_APIC_VECTOR(irq);
|
|
}
|
|
next:
|
|
current_vector += 8;
|
|
if (current_vector == IA32_SYSCALL_VECTOR)
|
|
goto next;
|
|
|
|
if (current_vector >= FIRST_SYSTEM_VECTOR) {
|
|
/* If we run out of vectors on large boxen, must share them. */
|
|
offset = (offset + 1) % 8;
|
|
current_vector = FIRST_DEVICE_VECTOR + offset;
|
|
}
|
|
|
|
vector = current_vector;
|
|
vector_irq[vector] = irq;
|
|
if (irq != AUTO_ASSIGN)
|
|
IO_APIC_VECTOR(irq) = vector;
|
|
|
|
spin_unlock_irqrestore(&vector_lock, flags);
|
|
|
|
return vector;
|
|
}
|
|
|
|
extern void (*interrupt[NR_IRQS])(void);
|
|
static struct hw_interrupt_type ioapic_level_type;
|
|
static struct hw_interrupt_type ioapic_edge_type;
|
|
|
|
#define IOAPIC_AUTO -1
|
|
#define IOAPIC_EDGE 0
|
|
#define IOAPIC_LEVEL 1
|
|
|
|
static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
|
|
{
|
|
unsigned idx;
|
|
|
|
idx = use_pci_vector() && !platform_legacy_irq(irq) ? vector : irq;
|
|
|
|
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
|
|
trigger == IOAPIC_LEVEL)
|
|
irq_desc[idx].chip = &ioapic_level_type;
|
|
else
|
|
irq_desc[idx].chip = &ioapic_edge_type;
|
|
set_intr_gate(vector, interrupt[idx]);
|
|
}
|
|
|
|
static void __init setup_IO_APIC_irqs(void)
|
|
{
|
|
struct IO_APIC_route_entry entry;
|
|
int apic, pin, idx, irq, first_notcon = 1, vector;
|
|
unsigned long flags;
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
|
|
|
|
/*
|
|
* add it to the IO-APIC irq-routing table:
|
|
*/
|
|
memset(&entry,0,sizeof(entry));
|
|
|
|
entry.delivery_mode = INT_DELIVERY_MODE;
|
|
entry.dest_mode = INT_DEST_MODE;
|
|
entry.mask = 0; /* enable IRQ */
|
|
entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
|
|
|
|
idx = find_irq_entry(apic,pin,mp_INT);
|
|
if (idx == -1) {
|
|
if (first_notcon) {
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
|
|
first_notcon = 0;
|
|
} else
|
|
apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
|
|
continue;
|
|
}
|
|
|
|
entry.trigger = irq_trigger(idx);
|
|
entry.polarity = irq_polarity(idx);
|
|
|
|
if (irq_trigger(idx)) {
|
|
entry.trigger = 1;
|
|
entry.mask = 1;
|
|
entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
|
|
}
|
|
|
|
irq = pin_2_irq(idx, apic, pin);
|
|
add_pin_to_irq(irq, apic, pin);
|
|
|
|
if (!apic && !IO_APIC_IRQ(irq))
|
|
continue;
|
|
|
|
if (IO_APIC_IRQ(irq)) {
|
|
vector = assign_irq_vector(irq);
|
|
entry.vector = vector;
|
|
|
|
ioapic_register_intr(irq, vector, IOAPIC_AUTO);
|
|
if (!apic && (irq < 16))
|
|
disable_8259A_irq(irq);
|
|
}
|
|
ioapic_write_entry(apic, pin, entry);
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
set_native_irq_info(irq, TARGET_CPUS);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
}
|
|
|
|
if (!first_notcon)
|
|
apic_printk(APIC_VERBOSE," not connected.\n");
|
|
}
|
|
|
|
/*
|
|
* Set up the 8259A-master output pin as broadcast to all
|
|
* CPUs.
|
|
*/
|
|
static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
|
|
{
|
|
struct IO_APIC_route_entry entry;
|
|
unsigned long flags;
|
|
|
|
memset(&entry,0,sizeof(entry));
|
|
|
|
disable_8259A_irq(0);
|
|
|
|
/* mask LVT0 */
|
|
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
|
|
|
|
/*
|
|
* We use logical delivery to get the timer IRQ
|
|
* to the first CPU.
|
|
*/
|
|
entry.dest_mode = INT_DEST_MODE;
|
|
entry.mask = 0; /* unmask IRQ now */
|
|
entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
|
|
entry.delivery_mode = INT_DELIVERY_MODE;
|
|
entry.polarity = 0;
|
|
entry.trigger = 0;
|
|
entry.vector = vector;
|
|
|
|
/*
|
|
* The timer IRQ doesn't have to know that behind the
|
|
* scene we have a 8259A-master in AEOI mode ...
|
|
*/
|
|
irq_desc[0].chip = &ioapic_edge_type;
|
|
|
|
/*
|
|
* Add it to the IO-APIC irq-routing table:
|
|
*/
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
|
|
io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
enable_8259A_irq(0);
|
|
}
|
|
|
|
void __init UNEXPECTED_IO_APIC(void)
|
|
{
|
|
}
|
|
|
|
void __apicdebuginit print_IO_APIC(void)
|
|
{
|
|
int apic, i;
|
|
union IO_APIC_reg_00 reg_00;
|
|
union IO_APIC_reg_01 reg_01;
|
|
union IO_APIC_reg_02 reg_02;
|
|
unsigned long flags;
|
|
|
|
if (apic_verbosity == APIC_QUIET)
|
|
return;
|
|
|
|
printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
|
|
for (i = 0; i < nr_ioapics; i++)
|
|
printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
|
|
mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
|
|
|
|
/*
|
|
* We are a bit conservative about what we expect. We have to
|
|
* know about every hardware change ASAP.
|
|
*/
|
|
printk(KERN_INFO "testing the IO APIC.......................\n");
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(apic, 0);
|
|
reg_01.raw = io_apic_read(apic, 1);
|
|
if (reg_01.bits.version >= 0x10)
|
|
reg_02.raw = io_apic_read(apic, 2);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
printk("\n");
|
|
printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
|
|
printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
|
|
printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
|
|
if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
|
|
UNEXPECTED_IO_APIC();
|
|
|
|
printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
|
|
printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
|
|
if ( (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
|
|
(reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
|
|
(reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
|
|
(reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
|
|
(reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
|
|
(reg_01.bits.entries != 0x2E) &&
|
|
(reg_01.bits.entries != 0x3F) &&
|
|
(reg_01.bits.entries != 0x03)
|
|
)
|
|
UNEXPECTED_IO_APIC();
|
|
|
|
printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
|
|
printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
|
|
if ( (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
|
|
(reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */
|
|
(reg_01.bits.version != 0x10) && /* oldest IO-APICs */
|
|
(reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
|
|
(reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
|
|
(reg_01.bits.version != 0x20) /* Intel P64H (82806 AA) */
|
|
)
|
|
UNEXPECTED_IO_APIC();
|
|
if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
|
|
UNEXPECTED_IO_APIC();
|
|
|
|
if (reg_01.bits.version >= 0x10) {
|
|
printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
|
|
printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
|
|
if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
|
|
UNEXPECTED_IO_APIC();
|
|
}
|
|
|
|
printk(KERN_DEBUG ".... IRQ redirection table:\n");
|
|
|
|
printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
|
|
" Stat Dest Deli Vect: \n");
|
|
|
|
for (i = 0; i <= reg_01.bits.entries; i++) {
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
entry = ioapic_read_entry(apic, i);
|
|
|
|
printk(KERN_DEBUG " %02x %03X %02X ",
|
|
i,
|
|
entry.dest.logical.logical_dest,
|
|
entry.dest.physical.physical_dest
|
|
);
|
|
|
|
printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
|
|
entry.mask,
|
|
entry.trigger,
|
|
entry.irr,
|
|
entry.polarity,
|
|
entry.delivery_status,
|
|
entry.dest_mode,
|
|
entry.delivery_mode,
|
|
entry.vector
|
|
);
|
|
}
|
|
}
|
|
if (use_pci_vector())
|
|
printk(KERN_INFO "Using vector-based indexing\n");
|
|
printk(KERN_DEBUG "IRQ to pin mappings:\n");
|
|
for (i = 0; i < NR_IRQS; i++) {
|
|
struct irq_pin_list *entry = irq_2_pin + i;
|
|
if (entry->pin < 0)
|
|
continue;
|
|
if (use_pci_vector() && !platform_legacy_irq(i))
|
|
printk(KERN_DEBUG "IRQ%d ", IO_APIC_VECTOR(i));
|
|
else
|
|
printk(KERN_DEBUG "IRQ%d ", i);
|
|
for (;;) {
|
|
printk("-> %d:%d", entry->apic, entry->pin);
|
|
if (!entry->next)
|
|
break;
|
|
entry = irq_2_pin + entry->next;
|
|
}
|
|
printk("\n");
|
|
}
|
|
|
|
printk(KERN_INFO ".................................... done.\n");
|
|
|
|
return;
|
|
}
|
|
|
|
#if 0
|
|
|
|
static __apicdebuginit void print_APIC_bitfield (int base)
|
|
{
|
|
unsigned int v;
|
|
int i, j;
|
|
|
|
if (apic_verbosity == APIC_QUIET)
|
|
return;
|
|
|
|
printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
|
|
for (i = 0; i < 8; i++) {
|
|
v = apic_read(base + i*0x10);
|
|
for (j = 0; j < 32; j++) {
|
|
if (v & (1<<j))
|
|
printk("1");
|
|
else
|
|
printk("0");
|
|
}
|
|
printk("\n");
|
|
}
|
|
}
|
|
|
|
void __apicdebuginit print_local_APIC(void * dummy)
|
|
{
|
|
unsigned int v, ver, maxlvt;
|
|
|
|
if (apic_verbosity == APIC_QUIET)
|
|
return;
|
|
|
|
printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
|
|
smp_processor_id(), hard_smp_processor_id());
|
|
v = apic_read(APIC_ID);
|
|
printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
|
|
v = apic_read(APIC_LVR);
|
|
printk(KERN_INFO "... APIC VERSION: %08x\n", v);
|
|
ver = GET_APIC_VERSION(v);
|
|
maxlvt = get_maxlvt();
|
|
|
|
v = apic_read(APIC_TASKPRI);
|
|
printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
|
|
|
|
v = apic_read(APIC_ARBPRI);
|
|
printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
|
|
v & APIC_ARBPRI_MASK);
|
|
v = apic_read(APIC_PROCPRI);
|
|
printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
|
|
|
|
v = apic_read(APIC_EOI);
|
|
printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
|
|
v = apic_read(APIC_RRR);
|
|
printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
|
|
v = apic_read(APIC_LDR);
|
|
printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
|
|
v = apic_read(APIC_DFR);
|
|
printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
|
|
v = apic_read(APIC_SPIV);
|
|
printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
|
|
|
|
printk(KERN_DEBUG "... APIC ISR field:\n");
|
|
print_APIC_bitfield(APIC_ISR);
|
|
printk(KERN_DEBUG "... APIC TMR field:\n");
|
|
print_APIC_bitfield(APIC_TMR);
|
|
printk(KERN_DEBUG "... APIC IRR field:\n");
|
|
print_APIC_bitfield(APIC_IRR);
|
|
|
|
v = apic_read(APIC_ESR);
|
|
printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
|
|
|
|
v = apic_read(APIC_ICR);
|
|
printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
|
|
v = apic_read(APIC_ICR2);
|
|
printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
|
|
|
|
v = apic_read(APIC_LVTT);
|
|
printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
|
|
|
|
if (maxlvt > 3) { /* PC is LVT#4. */
|
|
v = apic_read(APIC_LVTPC);
|
|
printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
|
|
}
|
|
v = apic_read(APIC_LVT0);
|
|
printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
|
|
v = apic_read(APIC_LVT1);
|
|
printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
|
|
|
|
if (maxlvt > 2) { /* ERR is LVT#3. */
|
|
v = apic_read(APIC_LVTERR);
|
|
printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
|
|
}
|
|
|
|
v = apic_read(APIC_TMICT);
|
|
printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
|
|
v = apic_read(APIC_TMCCT);
|
|
printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
|
|
v = apic_read(APIC_TDCR);
|
|
printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
|
|
printk("\n");
|
|
}
|
|
|
|
void print_all_local_APICs (void)
|
|
{
|
|
on_each_cpu(print_local_APIC, NULL, 1, 1);
|
|
}
|
|
|
|
void __apicdebuginit print_PIC(void)
|
|
{
|
|
unsigned int v;
|
|
unsigned long flags;
|
|
|
|
if (apic_verbosity == APIC_QUIET)
|
|
return;
|
|
|
|
printk(KERN_DEBUG "\nprinting PIC contents\n");
|
|
|
|
spin_lock_irqsave(&i8259A_lock, flags);
|
|
|
|
v = inb(0xa1) << 8 | inb(0x21);
|
|
printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
|
|
|
|
v = inb(0xa0) << 8 | inb(0x20);
|
|
printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
|
|
|
|
outb(0x0b,0xa0);
|
|
outb(0x0b,0x20);
|
|
v = inb(0xa0) << 8 | inb(0x20);
|
|
outb(0x0a,0xa0);
|
|
outb(0x0a,0x20);
|
|
|
|
spin_unlock_irqrestore(&i8259A_lock, flags);
|
|
|
|
printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
|
|
|
|
v = inb(0x4d1) << 8 | inb(0x4d0);
|
|
printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
|
|
}
|
|
|
|
#endif /* 0 */
|
|
|
|
static void __init enable_IO_APIC(void)
|
|
{
|
|
union IO_APIC_reg_01 reg_01;
|
|
int i8259_apic, i8259_pin;
|
|
int i, apic;
|
|
unsigned long flags;
|
|
|
|
for (i = 0; i < PIN_MAP_SIZE; i++) {
|
|
irq_2_pin[i].pin = -1;
|
|
irq_2_pin[i].next = 0;
|
|
}
|
|
|
|
/*
|
|
* The number of IO-APIC IRQ registers (== #pins):
|
|
*/
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_01.raw = io_apic_read(apic, 1);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
nr_ioapic_registers[apic] = reg_01.bits.entries+1;
|
|
}
|
|
for(apic = 0; apic < nr_ioapics; apic++) {
|
|
int pin;
|
|
/* See if any of the pins is in ExtINT mode */
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
|
|
struct IO_APIC_route_entry entry;
|
|
entry = ioapic_read_entry(apic, pin);
|
|
|
|
/* If the interrupt line is enabled and in ExtInt mode
|
|
* I have found the pin where the i8259 is connected.
|
|
*/
|
|
if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
|
|
ioapic_i8259.apic = apic;
|
|
ioapic_i8259.pin = pin;
|
|
goto found_i8259;
|
|
}
|
|
}
|
|
}
|
|
found_i8259:
|
|
/* Look to see what if the MP table has reported the ExtINT */
|
|
i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
|
|
i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
|
|
/* Trust the MP table if nothing is setup in the hardware */
|
|
if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
|
|
printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
|
|
ioapic_i8259.pin = i8259_pin;
|
|
ioapic_i8259.apic = i8259_apic;
|
|
}
|
|
/* Complain if the MP table and the hardware disagree */
|
|
if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
|
|
(i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
|
|
{
|
|
printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
|
|
}
|
|
|
|
/*
|
|
* Do not trust the IO-APIC being empty at bootup
|
|
*/
|
|
clear_IO_APIC();
|
|
}
|
|
|
|
/*
|
|
* Not an __init, needed by the reboot code
|
|
*/
|
|
void disable_IO_APIC(void)
|
|
{
|
|
/*
|
|
* Clear the IO-APIC before rebooting:
|
|
*/
|
|
clear_IO_APIC();
|
|
|
|
/*
|
|
* If the i8259 is routed through an IOAPIC
|
|
* Put that IOAPIC in virtual wire mode
|
|
* so legacy interrupts can be delivered.
|
|
*/
|
|
if (ioapic_i8259.pin != -1) {
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
memset(&entry, 0, sizeof(entry));
|
|
entry.mask = 0; /* Enabled */
|
|
entry.trigger = 0; /* Edge */
|
|
entry.irr = 0;
|
|
entry.polarity = 0; /* High */
|
|
entry.delivery_status = 0;
|
|
entry.dest_mode = 0; /* Physical */
|
|
entry.delivery_mode = dest_ExtINT; /* ExtInt */
|
|
entry.vector = 0;
|
|
entry.dest.physical.physical_dest =
|
|
GET_APIC_ID(apic_read(APIC_ID));
|
|
|
|
/*
|
|
* Add it to the IO-APIC irq-routing table:
|
|
*/
|
|
ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
|
|
}
|
|
|
|
disconnect_bsp_APIC(ioapic_i8259.pin != -1);
|
|
}
|
|
|
|
/*
|
|
* There is a nasty bug in some older SMP boards, their mptable lies
|
|
* about the timer IRQ. We do the following to work around the situation:
|
|
*
|
|
* - timer IRQ defaults to IO-APIC IRQ
|
|
* - if this function detects that timer IRQs are defunct, then we fall
|
|
* back to ISA timer IRQs
|
|
*/
|
|
static int __init timer_irq_works(void)
|
|
{
|
|
unsigned long t1 = jiffies;
|
|
|
|
local_irq_enable();
|
|
/* Let ten ticks pass... */
|
|
mdelay((10 * 1000) / HZ);
|
|
|
|
/*
|
|
* Expect a few ticks at least, to be sure some possible
|
|
* glue logic does not lock up after one or two first
|
|
* ticks in a non-ExtINT mode. Also the local APIC
|
|
* might have cached one ExtINT interrupt. Finally, at
|
|
* least one tick may be lost due to delays.
|
|
*/
|
|
|
|
/* jiffies wrap? */
|
|
if (jiffies - t1 > 4)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* In the SMP+IOAPIC case it might happen that there are an unspecified
|
|
* number of pending IRQ events unhandled. These cases are very rare,
|
|
* so we 'resend' these IRQs via IPIs, to the same CPU. It's much
|
|
* better to do it this way as thus we do not have to be aware of
|
|
* 'pending' interrupts in the IRQ path, except at this point.
|
|
*/
|
|
/*
|
|
* Edge triggered needs to resend any interrupt
|
|
* that was delayed but this is now handled in the device
|
|
* independent code.
|
|
*/
|
|
|
|
/*
|
|
* Starting up a edge-triggered IO-APIC interrupt is
|
|
* nasty - we need to make sure that we get the edge.
|
|
* If it is already asserted for some reason, we need
|
|
* return 1 to indicate that is was pending.
|
|
*
|
|
* This is not complete - we should be able to fake
|
|
* an edge even if it isn't on the 8259A...
|
|
*/
|
|
|
|
static unsigned int startup_edge_ioapic_irq(unsigned int irq)
|
|
{
|
|
int was_pending = 0;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
if (irq < 16) {
|
|
disable_8259A_irq(irq);
|
|
if (i8259A_irq_pending(irq))
|
|
was_pending = 1;
|
|
}
|
|
__unmask_IO_APIC_irq(irq);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return was_pending;
|
|
}
|
|
|
|
/*
|
|
* Once we have recorded IRQ_PENDING already, we can mask the
|
|
* interrupt for real. This prevents IRQ storms from unhandled
|
|
* devices.
|
|
*/
|
|
static void ack_edge_ioapic_irq(unsigned int irq)
|
|
{
|
|
move_irq(irq);
|
|
if ((irq_desc[irq].status & (IRQ_PENDING | IRQ_DISABLED))
|
|
== (IRQ_PENDING | IRQ_DISABLED))
|
|
mask_IO_APIC_irq(irq);
|
|
ack_APIC_irq();
|
|
}
|
|
|
|
/*
|
|
* Level triggered interrupts can just be masked,
|
|
* and shutting down and starting up the interrupt
|
|
* is the same as enabling and disabling them -- except
|
|
* with a startup need to return a "was pending" value.
|
|
*
|
|
* Level triggered interrupts are special because we
|
|
* do not touch any IO-APIC register while handling
|
|
* them. We ack the APIC in the end-IRQ handler, not
|
|
* in the start-IRQ-handler. Protection against reentrance
|
|
* from the same interrupt is still provided, both by the
|
|
* generic IRQ layer and by the fact that an unacked local
|
|
* APIC does not accept IRQs.
|
|
*/
|
|
static unsigned int startup_level_ioapic_irq (unsigned int irq)
|
|
{
|
|
unmask_IO_APIC_irq(irq);
|
|
|
|
return 0; /* don't check for pending */
|
|
}
|
|
|
|
static void end_level_ioapic_irq (unsigned int irq)
|
|
{
|
|
move_irq(irq);
|
|
ack_APIC_irq();
|
|
}
|
|
|
|
#ifdef CONFIG_PCI_MSI
|
|
static unsigned int startup_edge_ioapic_vector(unsigned int vector)
|
|
{
|
|
int irq = vector_to_irq(vector);
|
|
|
|
return startup_edge_ioapic_irq(irq);
|
|
}
|
|
|
|
static void ack_edge_ioapic_vector(unsigned int vector)
|
|
{
|
|
int irq = vector_to_irq(vector);
|
|
|
|
move_native_irq(vector);
|
|
ack_edge_ioapic_irq(irq);
|
|
}
|
|
|
|
static unsigned int startup_level_ioapic_vector (unsigned int vector)
|
|
{
|
|
int irq = vector_to_irq(vector);
|
|
|
|
return startup_level_ioapic_irq (irq);
|
|
}
|
|
|
|
static void end_level_ioapic_vector (unsigned int vector)
|
|
{
|
|
int irq = vector_to_irq(vector);
|
|
|
|
move_native_irq(vector);
|
|
end_level_ioapic_irq(irq);
|
|
}
|
|
|
|
static void mask_IO_APIC_vector (unsigned int vector)
|
|
{
|
|
int irq = vector_to_irq(vector);
|
|
|
|
mask_IO_APIC_irq(irq);
|
|
}
|
|
|
|
static void unmask_IO_APIC_vector (unsigned int vector)
|
|
{
|
|
int irq = vector_to_irq(vector);
|
|
|
|
unmask_IO_APIC_irq(irq);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static void set_ioapic_affinity_vector (unsigned int vector,
|
|
cpumask_t cpu_mask)
|
|
{
|
|
int irq = vector_to_irq(vector);
|
|
|
|
set_native_irq_info(vector, cpu_mask);
|
|
set_ioapic_affinity_irq(irq, cpu_mask);
|
|
}
|
|
#endif // CONFIG_SMP
|
|
#endif // CONFIG_PCI_MSI
|
|
|
|
static int ioapic_retrigger(unsigned int irq)
|
|
{
|
|
send_IPI_self(IO_APIC_VECTOR(irq));
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Level and edge triggered IO-APIC interrupts need different handling,
|
|
* so we use two separate IRQ descriptors. Edge triggered IRQs can be
|
|
* handled with the level-triggered descriptor, but that one has slightly
|
|
* more overhead. Level-triggered interrupts cannot be handled with the
|
|
* edge-triggered handler, without risking IRQ storms and other ugly
|
|
* races.
|
|
*/
|
|
|
|
static struct hw_interrupt_type ioapic_edge_type __read_mostly = {
|
|
.typename = "IO-APIC-edge",
|
|
.startup = startup_edge_ioapic,
|
|
.shutdown = shutdown_edge_ioapic,
|
|
.enable = enable_edge_ioapic,
|
|
.disable = disable_edge_ioapic,
|
|
.ack = ack_edge_ioapic,
|
|
.end = end_edge_ioapic,
|
|
#ifdef CONFIG_SMP
|
|
.set_affinity = set_ioapic_affinity,
|
|
#endif
|
|
.retrigger = ioapic_retrigger,
|
|
};
|
|
|
|
static struct hw_interrupt_type ioapic_level_type __read_mostly = {
|
|
.typename = "IO-APIC-level",
|
|
.startup = startup_level_ioapic,
|
|
.shutdown = shutdown_level_ioapic,
|
|
.enable = enable_level_ioapic,
|
|
.disable = disable_level_ioapic,
|
|
.ack = mask_and_ack_level_ioapic,
|
|
.end = end_level_ioapic,
|
|
#ifdef CONFIG_SMP
|
|
.set_affinity = set_ioapic_affinity,
|
|
#endif
|
|
.retrigger = ioapic_retrigger,
|
|
};
|
|
|
|
static inline void init_IO_APIC_traps(void)
|
|
{
|
|
int irq;
|
|
|
|
/*
|
|
* NOTE! The local APIC isn't very good at handling
|
|
* multiple interrupts at the same interrupt level.
|
|
* As the interrupt level is determined by taking the
|
|
* vector number and shifting that right by 4, we
|
|
* want to spread these out a bit so that they don't
|
|
* all fall in the same interrupt level.
|
|
*
|
|
* Also, we've got to be careful not to trash gate
|
|
* 0x80, because int 0x80 is hm, kind of importantish. ;)
|
|
*/
|
|
for (irq = 0; irq < NR_IRQS ; irq++) {
|
|
int tmp = irq;
|
|
if (use_pci_vector()) {
|
|
if (!platform_legacy_irq(tmp))
|
|
if ((tmp = vector_to_irq(tmp)) == -1)
|
|
continue;
|
|
}
|
|
if (IO_APIC_IRQ(tmp) && !IO_APIC_VECTOR(tmp)) {
|
|
/*
|
|
* Hmm.. We don't have an entry for this,
|
|
* so default to an old-fashioned 8259
|
|
* interrupt if we can..
|
|
*/
|
|
if (irq < 16)
|
|
make_8259A_irq(irq);
|
|
else
|
|
/* Strange. Oh, well.. */
|
|
irq_desc[irq].chip = &no_irq_type;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void enable_lapic_irq (unsigned int irq)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = apic_read(APIC_LVT0);
|
|
apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
|
|
}
|
|
|
|
static void disable_lapic_irq (unsigned int irq)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = apic_read(APIC_LVT0);
|
|
apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
|
|
}
|
|
|
|
static void ack_lapic_irq (unsigned int irq)
|
|
{
|
|
ack_APIC_irq();
|
|
}
|
|
|
|
static void end_lapic_irq (unsigned int i) { /* nothing */ }
|
|
|
|
static struct hw_interrupt_type lapic_irq_type __read_mostly = {
|
|
.typename = "local-APIC-edge",
|
|
.startup = NULL, /* startup_irq() not used for IRQ0 */
|
|
.shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
|
|
.enable = enable_lapic_irq,
|
|
.disable = disable_lapic_irq,
|
|
.ack = ack_lapic_irq,
|
|
.end = end_lapic_irq,
|
|
};
|
|
|
|
static void setup_nmi (void)
|
|
{
|
|
/*
|
|
* Dirty trick to enable the NMI watchdog ...
|
|
* We put the 8259A master into AEOI mode and
|
|
* unmask on all local APICs LVT0 as NMI.
|
|
*
|
|
* The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
|
|
* is from Maciej W. Rozycki - so we do not have to EOI from
|
|
* the NMI handler or the timer interrupt.
|
|
*/
|
|
printk(KERN_INFO "activating NMI Watchdog ...");
|
|
|
|
enable_NMI_through_LVT0(NULL);
|
|
|
|
printk(" done.\n");
|
|
}
|
|
|
|
/*
|
|
* This looks a bit hackish but it's about the only one way of sending
|
|
* a few INTA cycles to 8259As and any associated glue logic. ICR does
|
|
* not support the ExtINT mode, unfortunately. We need to send these
|
|
* cycles as some i82489DX-based boards have glue logic that keeps the
|
|
* 8259A interrupt line asserted until INTA. --macro
|
|
*/
|
|
static inline void unlock_ExtINT_logic(void)
|
|
{
|
|
int apic, pin, i;
|
|
struct IO_APIC_route_entry entry0, entry1;
|
|
unsigned char save_control, save_freq_select;
|
|
unsigned long flags;
|
|
|
|
pin = find_isa_irq_pin(8, mp_INT);
|
|
apic = find_isa_irq_apic(8, mp_INT);
|
|
if (pin == -1)
|
|
return;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
*(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
|
|
*(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
clear_IO_APIC_pin(apic, pin);
|
|
|
|
memset(&entry1, 0, sizeof(entry1));
|
|
|
|
entry1.dest_mode = 0; /* physical delivery */
|
|
entry1.mask = 0; /* unmask IRQ now */
|
|
entry1.dest.physical.physical_dest = hard_smp_processor_id();
|
|
entry1.delivery_mode = dest_ExtINT;
|
|
entry1.polarity = entry0.polarity;
|
|
entry1.trigger = 0;
|
|
entry1.vector = 0;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
|
|
io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
save_control = CMOS_READ(RTC_CONTROL);
|
|
save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
|
|
CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
|
|
RTC_FREQ_SELECT);
|
|
CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
|
|
|
|
i = 100;
|
|
while (i-- > 0) {
|
|
mdelay(10);
|
|
if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
|
|
i -= 10;
|
|
}
|
|
|
|
CMOS_WRITE(save_control, RTC_CONTROL);
|
|
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
|
|
clear_IO_APIC_pin(apic, pin);
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
|
|
io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
int timer_uses_ioapic_pin_0;
|
|
|
|
/*
|
|
* This code may look a bit paranoid, but it's supposed to cooperate with
|
|
* a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
|
|
* is so screwy. Thanks to Brian Perkins for testing/hacking this beast
|
|
* fanatically on his truly buggy board.
|
|
*
|
|
* FIXME: really need to revamp this for modern platforms only.
|
|
*/
|
|
static inline void check_timer(void)
|
|
{
|
|
int apic1, pin1, apic2, pin2;
|
|
int vector;
|
|
|
|
/*
|
|
* get/set the timer IRQ vector:
|
|
*/
|
|
disable_8259A_irq(0);
|
|
vector = assign_irq_vector(0);
|
|
set_intr_gate(vector, interrupt[0]);
|
|
|
|
/*
|
|
* Subtle, code in do_timer_interrupt() expects an AEOI
|
|
* mode for the 8259A whenever interrupts are routed
|
|
* through I/O APICs. Also IRQ0 has to be enabled in
|
|
* the 8259A which implies the virtual wire has to be
|
|
* disabled in the local APIC.
|
|
*/
|
|
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
|
|
init_8259A(1);
|
|
if (timer_over_8254 > 0)
|
|
enable_8259A_irq(0);
|
|
|
|
pin1 = find_isa_irq_pin(0, mp_INT);
|
|
apic1 = find_isa_irq_apic(0, mp_INT);
|
|
pin2 = ioapic_i8259.pin;
|
|
apic2 = ioapic_i8259.apic;
|
|
|
|
if (pin1 == 0)
|
|
timer_uses_ioapic_pin_0 = 1;
|
|
|
|
apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
|
|
vector, apic1, pin1, apic2, pin2);
|
|
|
|
if (pin1 != -1) {
|
|
/*
|
|
* Ok, does IRQ0 through the IOAPIC work?
|
|
*/
|
|
unmask_IO_APIC_irq(0);
|
|
if (!no_timer_check && timer_irq_works()) {
|
|
nmi_watchdog_default();
|
|
if (nmi_watchdog == NMI_IO_APIC) {
|
|
disable_8259A_irq(0);
|
|
setup_nmi();
|
|
enable_8259A_irq(0);
|
|
}
|
|
if (disable_timer_pin_1 > 0)
|
|
clear_IO_APIC_pin(0, pin1);
|
|
return;
|
|
}
|
|
clear_IO_APIC_pin(apic1, pin1);
|
|
apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
|
|
"connected to IO-APIC\n");
|
|
}
|
|
|
|
apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
|
|
"through the 8259A ... ");
|
|
if (pin2 != -1) {
|
|
apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
|
|
apic2, pin2);
|
|
/*
|
|
* legacy devices should be connected to IO APIC #0
|
|
*/
|
|
setup_ExtINT_IRQ0_pin(apic2, pin2, vector);
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_VERBOSE," works.\n");
|
|
nmi_watchdog_default();
|
|
if (nmi_watchdog == NMI_IO_APIC) {
|
|
setup_nmi();
|
|
}
|
|
return;
|
|
}
|
|
/*
|
|
* Cleanup, just in case ...
|
|
*/
|
|
clear_IO_APIC_pin(apic2, pin2);
|
|
}
|
|
apic_printk(APIC_VERBOSE," failed.\n");
|
|
|
|
if (nmi_watchdog == NMI_IO_APIC) {
|
|
printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
|
|
nmi_watchdog = 0;
|
|
}
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
|
|
|
|
disable_8259A_irq(0);
|
|
irq_desc[0].chip = &lapic_irq_type;
|
|
apic_write(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */
|
|
enable_8259A_irq(0);
|
|
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_VERBOSE," works.\n");
|
|
return;
|
|
}
|
|
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
|
|
apic_printk(APIC_VERBOSE," failed.\n");
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
|
|
|
|
init_8259A(0);
|
|
make_8259A_irq(0);
|
|
apic_write(APIC_LVT0, APIC_DM_EXTINT);
|
|
|
|
unlock_ExtINT_logic();
|
|
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_VERBOSE," works.\n");
|
|
return;
|
|
}
|
|
apic_printk(APIC_VERBOSE," failed :(.\n");
|
|
panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
|
|
}
|
|
|
|
static int __init notimercheck(char *s)
|
|
{
|
|
no_timer_check = 1;
|
|
return 1;
|
|
}
|
|
__setup("no_timer_check", notimercheck);
|
|
|
|
/*
|
|
*
|
|
* IRQ's that are handled by the PIC in the MPS IOAPIC case.
|
|
* - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
|
|
* Linux doesn't really care, as it's not actually used
|
|
* for any interrupt handling anyway.
|
|
*/
|
|
#define PIC_IRQS (1<<2)
|
|
|
|
void __init setup_IO_APIC(void)
|
|
{
|
|
enable_IO_APIC();
|
|
|
|
if (acpi_ioapic)
|
|
io_apic_irqs = ~0; /* all IRQs go through IOAPIC */
|
|
else
|
|
io_apic_irqs = ~PIC_IRQS;
|
|
|
|
apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
|
|
|
|
sync_Arb_IDs();
|
|
setup_IO_APIC_irqs();
|
|
init_IO_APIC_traps();
|
|
check_timer();
|
|
if (!acpi_ioapic)
|
|
print_IO_APIC();
|
|
}
|
|
|
|
struct sysfs_ioapic_data {
|
|
struct sys_device dev;
|
|
struct IO_APIC_route_entry entry[0];
|
|
};
|
|
static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
|
|
|
|
static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
|
|
{
|
|
struct IO_APIC_route_entry *entry;
|
|
struct sysfs_ioapic_data *data;
|
|
int i;
|
|
|
|
data = container_of(dev, struct sysfs_ioapic_data, dev);
|
|
entry = data->entry;
|
|
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
|
|
*entry = ioapic_read_entry(dev->id, i);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ioapic_resume(struct sys_device *dev)
|
|
{
|
|
struct IO_APIC_route_entry *entry;
|
|
struct sysfs_ioapic_data *data;
|
|
unsigned long flags;
|
|
union IO_APIC_reg_00 reg_00;
|
|
int i;
|
|
|
|
data = container_of(dev, struct sysfs_ioapic_data, dev);
|
|
entry = data->entry;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(dev->id, 0);
|
|
if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
|
|
reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
|
|
io_apic_write(dev->id, 0, reg_00.raw);
|
|
}
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
|
|
ioapic_write_entry(dev->id, i, entry[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct sysdev_class ioapic_sysdev_class = {
|
|
set_kset_name("ioapic"),
|
|
.suspend = ioapic_suspend,
|
|
.resume = ioapic_resume,
|
|
};
|
|
|
|
static int __init ioapic_init_sysfs(void)
|
|
{
|
|
struct sys_device * dev;
|
|
int i, size, error = 0;
|
|
|
|
error = sysdev_class_register(&ioapic_sysdev_class);
|
|
if (error)
|
|
return error;
|
|
|
|
for (i = 0; i < nr_ioapics; i++ ) {
|
|
size = sizeof(struct sys_device) + nr_ioapic_registers[i]
|
|
* sizeof(struct IO_APIC_route_entry);
|
|
mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
|
|
if (!mp_ioapic_data[i]) {
|
|
printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
|
|
continue;
|
|
}
|
|
memset(mp_ioapic_data[i], 0, size);
|
|
dev = &mp_ioapic_data[i]->dev;
|
|
dev->id = i;
|
|
dev->cls = &ioapic_sysdev_class;
|
|
error = sysdev_register(dev);
|
|
if (error) {
|
|
kfree(mp_ioapic_data[i]);
|
|
mp_ioapic_data[i] = NULL;
|
|
printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(ioapic_init_sysfs);
|
|
|
|
/* --------------------------------------------------------------------------
|
|
ACPI-based IOAPIC Configuration
|
|
-------------------------------------------------------------------------- */
|
|
|
|
#ifdef CONFIG_ACPI
|
|
|
|
#define IO_APIC_MAX_ID 0xFE
|
|
|
|
int __init io_apic_get_version (int ioapic)
|
|
{
|
|
union IO_APIC_reg_01 reg_01;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_01.raw = io_apic_read(ioapic, 1);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return reg_01.bits.version;
|
|
}
|
|
|
|
|
|
int __init io_apic_get_redir_entries (int ioapic)
|
|
{
|
|
union IO_APIC_reg_01 reg_01;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_01.raw = io_apic_read(ioapic, 1);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return reg_01.bits.entries;
|
|
}
|
|
|
|
|
|
int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
|
|
{
|
|
struct IO_APIC_route_entry entry;
|
|
unsigned long flags;
|
|
|
|
if (!IO_APIC_IRQ(irq)) {
|
|
apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
|
|
ioapic);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
|
|
* Note that we mask (disable) IRQs now -- these get enabled when the
|
|
* corresponding device driver registers for this IRQ.
|
|
*/
|
|
|
|
memset(&entry,0,sizeof(entry));
|
|
|
|
entry.delivery_mode = INT_DELIVERY_MODE;
|
|
entry.dest_mode = INT_DEST_MODE;
|
|
entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
|
|
entry.trigger = triggering;
|
|
entry.polarity = polarity;
|
|
entry.mask = 1; /* Disabled (masked) */
|
|
|
|
irq = gsi_irq_sharing(irq);
|
|
/*
|
|
* IRQs < 16 are already in the irq_2_pin[] map
|
|
*/
|
|
if (irq >= 16)
|
|
add_pin_to_irq(irq, ioapic, pin);
|
|
|
|
entry.vector = assign_irq_vector(irq);
|
|
|
|
apic_printk(APIC_VERBOSE,KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry (%d-%d -> 0x%x -> "
|
|
"IRQ %d Mode:%i Active:%i)\n", ioapic,
|
|
mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,
|
|
triggering, polarity);
|
|
|
|
ioapic_register_intr(irq, entry.vector, triggering);
|
|
|
|
if (!ioapic && (irq < 16))
|
|
disable_8259A_irq(irq);
|
|
|
|
ioapic_write_entry(ioapic, pin, entry);
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
set_native_irq_info(use_pci_vector() ? entry.vector : irq, TARGET_CPUS);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_ACPI */
|
|
|
|
|
|
/*
|
|
* This function currently is only a helper for the i386 smp boot process where
|
|
* we need to reprogram the ioredtbls to cater for the cpus which have come online
|
|
* so mask in all cases should simply be TARGET_CPUS
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
void __init setup_ioapic_dest(void)
|
|
{
|
|
int pin, ioapic, irq, irq_entry;
|
|
|
|
if (skip_ioapic_setup == 1)
|
|
return;
|
|
|
|
for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
|
|
for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
|
|
irq_entry = find_irq_entry(ioapic, pin, mp_INT);
|
|
if (irq_entry == -1)
|
|
continue;
|
|
irq = pin_2_irq(irq_entry, ioapic, pin);
|
|
set_ioapic_affinity_irq(irq, TARGET_CPUS);
|
|
}
|
|
|
|
}
|
|
}
|
|
#endif
|