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![Jack F Vogel](/assets/img/avatar_default.png)
A bug against an xSeries system showed up recently noting that the check_nmi_watchdog() test was failing. I have been investigating it and discovered in both i386 and x86_64 the recent change to the routine to use the cpu_callin_map has uncovered a problem. Prior to that change, on an SMP box, the test was trivally passing because all cpu's were found to not yet be online, but now with the callin_map they are discovered, it goes on to test the counter and they have not yet begun to increment, so it announces a CPU is stuck and bails out. On all the systems I have access to test, the announcement of failure is also bougs... by the time you can login and check /proc/interrupts, the NMI count is happily incrementing on all CPUs. Its just that the test is being done too early. I have tried moving the call to the test around a bit, and it was always too early. I finally hit on this proposed solution, it delays the routine via a late_initcall(), seems like the right solution to me. Signed-off-by: Adrian Bunk <bunk@stusta.de> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2543 lines
64 KiB
C
2543 lines
64 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/irq.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/config.h>
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#include <linux/smp_lock.h>
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#include <linux/mc146818rtc.h>
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#include <linux/compiler.h>
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#include <linux/acpi.h>
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#include <linux/sysdev.h>
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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/timer.h>
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#include <mach_apic.h>
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#include "io_ports.h"
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int (*ioapic_renumber_irq)(int ioapic, int irq);
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atomic_t irq_mis_count;
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static DEFINE_SPINLOCK(ioapic_lock);
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/*
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* Is the SiS APIC rmw bug present ?
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* -1 = don't know, 0 = no, 1 = yes
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*/
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int sis_apic_bug = -1;
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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_IRQS
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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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int apic, pin, next;
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} irq_2_pin[PIN_MAP_SIZE];
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int vector_irq[NR_VECTORS] = { [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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/*
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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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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: whoops");
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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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/*
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* Reroute an IRQ to a different pin.
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*/
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static void __init replace_pin_at_irq(unsigned int irq,
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int oldapic, int oldpin,
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int newapic, int newpin)
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{
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struct irq_pin_list *entry = irq_2_pin + irq;
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while (1) {
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if (entry->apic == oldapic && entry->pin == oldpin) {
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entry->apic = newapic;
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entry->pin = newpin;
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}
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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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}
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static void __modify_IO_APIC_irq (unsigned int irq, unsigned long enable, unsigned long disable)
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{
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struct irq_pin_list *entry = irq_2_pin + irq;
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unsigned int pin, reg;
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for (;;) {
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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 + pin*2);
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reg &= ~disable;
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reg |= enable;
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io_apic_modify(entry->apic, 0x10 + pin*2, 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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}
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/* mask = 1 */
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static void __mask_IO_APIC_irq (unsigned int irq)
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{
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__modify_IO_APIC_irq(irq, 0x00010000, 0);
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}
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/* mask = 0 */
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static void __unmask_IO_APIC_irq (unsigned int irq)
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{
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__modify_IO_APIC_irq(irq, 0, 0x00010000);
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}
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/* mask = 1, trigger = 0 */
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static void __mask_and_edge_IO_APIC_irq (unsigned int irq)
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{
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__modify_IO_APIC_irq(irq, 0x00010000, 0x00008000);
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}
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/* mask = 0, trigger = 1 */
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static void __unmask_and_level_IO_APIC_irq (unsigned int irq)
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{
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__modify_IO_APIC_irq(irq, 0x00008000, 0x00010000);
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}
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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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unsigned long flags;
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/* Check delivery_mode to be sure we're not clearing an SMI pin */
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spin_lock_irqsave(&ioapic_lock, flags);
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*(((int*)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
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*(((int*)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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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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spin_lock_irqsave(&ioapic_lock, flags);
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io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry) + 0));
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io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry) + 1));
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spin_unlock_irqrestore(&ioapic_lock, flags);
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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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static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
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{
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unsigned long flags;
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int pin;
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struct irq_pin_list *entry = irq_2_pin + irq;
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unsigned int apicid_value;
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apicid_value = cpu_mask_to_apicid(cpumask);
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/* Prepare to do the io_apic_write */
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apicid_value = apicid_value << 24;
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spin_lock_irqsave(&ioapic_lock, flags);
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for (;;) {
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pin = entry->pin;
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if (pin == -1)
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break;
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io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value);
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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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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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#if defined(CONFIG_IRQBALANCE)
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# include <asm/processor.h> /* kernel_thread() */
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# include <linux/kernel_stat.h> /* kstat */
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# include <linux/slab.h> /* kmalloc() */
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# include <linux/timer.h> /* time_after() */
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# ifdef CONFIG_BALANCED_IRQ_DEBUG
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# define TDprintk(x...) do { printk("<%ld:%s:%d>: ", jiffies, __FILE__, __LINE__); printk(x); } while (0)
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# define Dprintk(x...) do { TDprintk(x); } while (0)
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# else
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# define TDprintk(x...)
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# define Dprintk(x...)
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# endif
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cpumask_t __cacheline_aligned pending_irq_balance_cpumask[NR_IRQS];
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#define IRQBALANCE_CHECK_ARCH -999
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static int irqbalance_disabled = IRQBALANCE_CHECK_ARCH;
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static int physical_balance = 0;
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static struct irq_cpu_info {
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unsigned long * last_irq;
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unsigned long * irq_delta;
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unsigned long irq;
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} irq_cpu_data[NR_CPUS];
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#define CPU_IRQ(cpu) (irq_cpu_data[cpu].irq)
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#define LAST_CPU_IRQ(cpu,irq) (irq_cpu_data[cpu].last_irq[irq])
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#define IRQ_DELTA(cpu,irq) (irq_cpu_data[cpu].irq_delta[irq])
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#define IDLE_ENOUGH(cpu,now) \
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(idle_cpu(cpu) && ((now) - per_cpu(irq_stat, (cpu)).idle_timestamp > 1))
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#define IRQ_ALLOWED(cpu, allowed_mask) cpu_isset(cpu, allowed_mask)
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#define CPU_TO_PACKAGEINDEX(i) (first_cpu(cpu_sibling_map[i]))
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#define MAX_BALANCED_IRQ_INTERVAL (5*HZ)
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#define MIN_BALANCED_IRQ_INTERVAL (HZ/2)
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#define BALANCED_IRQ_MORE_DELTA (HZ/10)
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#define BALANCED_IRQ_LESS_DELTA (HZ)
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static long balanced_irq_interval = MAX_BALANCED_IRQ_INTERVAL;
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static unsigned long move(int curr_cpu, cpumask_t allowed_mask,
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unsigned long now, int direction)
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{
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int search_idle = 1;
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int cpu = curr_cpu;
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goto inside;
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do {
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if (unlikely(cpu == curr_cpu))
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search_idle = 0;
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inside:
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if (direction == 1) {
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cpu++;
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if (cpu >= NR_CPUS)
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cpu = 0;
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} else {
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cpu--;
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if (cpu == -1)
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cpu = NR_CPUS-1;
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}
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} while (!cpu_online(cpu) || !IRQ_ALLOWED(cpu,allowed_mask) ||
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(search_idle && !IDLE_ENOUGH(cpu,now)));
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return cpu;
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}
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static inline void balance_irq(int cpu, int irq)
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{
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unsigned long now = jiffies;
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cpumask_t allowed_mask;
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unsigned int new_cpu;
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if (irqbalance_disabled)
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return;
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cpus_and(allowed_mask, cpu_online_map, irq_affinity[irq]);
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new_cpu = move(cpu, allowed_mask, now, 1);
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if (cpu != new_cpu) {
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irq_desc_t *desc = irq_desc + irq;
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unsigned long flags;
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spin_lock_irqsave(&desc->lock, flags);
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pending_irq_balance_cpumask[irq] = cpumask_of_cpu(new_cpu);
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spin_unlock_irqrestore(&desc->lock, flags);
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}
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}
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static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold)
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{
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int i, j;
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Dprintk("Rotating IRQs among CPUs.\n");
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for (i = 0; i < NR_CPUS; i++) {
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for (j = 0; cpu_online(i) && (j < NR_IRQS); j++) {
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if (!irq_desc[j].action)
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continue;
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/* Is it a significant load ? */
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if (IRQ_DELTA(CPU_TO_PACKAGEINDEX(i),j) <
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useful_load_threshold)
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continue;
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balance_irq(i, j);
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}
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}
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balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
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balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
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return;
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}
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static void do_irq_balance(void)
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{
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int i, j;
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unsigned long max_cpu_irq = 0, min_cpu_irq = (~0);
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unsigned long move_this_load = 0;
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int max_loaded = 0, min_loaded = 0;
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int load;
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unsigned long useful_load_threshold = balanced_irq_interval + 10;
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int selected_irq;
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int tmp_loaded, first_attempt = 1;
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unsigned long tmp_cpu_irq;
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unsigned long imbalance = 0;
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cpumask_t allowed_mask, target_cpu_mask, tmp;
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for (i = 0; i < NR_CPUS; i++) {
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int package_index;
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CPU_IRQ(i) = 0;
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if (!cpu_online(i))
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continue;
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package_index = CPU_TO_PACKAGEINDEX(i);
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for (j = 0; j < NR_IRQS; j++) {
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unsigned long value_now, delta;
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/* Is this an active IRQ? */
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if (!irq_desc[j].action)
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continue;
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if ( package_index == i )
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IRQ_DELTA(package_index,j) = 0;
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/* Determine the total count per processor per IRQ */
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value_now = (unsigned long) kstat_cpu(i).irqs[j];
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/* Determine the activity per processor per IRQ */
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delta = value_now - LAST_CPU_IRQ(i,j);
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/* Update last_cpu_irq[][] for the next time */
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LAST_CPU_IRQ(i,j) = value_now;
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/* Ignore IRQs whose rate is less than the clock */
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if (delta < useful_load_threshold)
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continue;
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/* update the load for the processor or package total */
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IRQ_DELTA(package_index,j) += delta;
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/* Keep track of the higher numbered sibling as well */
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if (i != package_index)
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CPU_IRQ(i) += delta;
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/*
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* We have sibling A and sibling B in the package
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*
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* cpu_irq[A] = load for cpu A + load for cpu B
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* cpu_irq[B] = load for cpu B
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*/
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CPU_IRQ(package_index) += delta;
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}
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}
|
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/* Find the least loaded processor package */
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for (i = 0; i < NR_CPUS; i++) {
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if (!cpu_online(i))
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continue;
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if (i != CPU_TO_PACKAGEINDEX(i))
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continue;
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if (min_cpu_irq > CPU_IRQ(i)) {
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min_cpu_irq = CPU_IRQ(i);
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min_loaded = i;
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}
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}
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max_cpu_irq = ULONG_MAX;
|
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tryanothercpu:
|
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/* Look for heaviest loaded processor.
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* We may come back to get the next heaviest loaded processor.
|
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* Skip processors with trivial loads.
|
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*/
|
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tmp_cpu_irq = 0;
|
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tmp_loaded = -1;
|
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for (i = 0; i < NR_CPUS; i++) {
|
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if (!cpu_online(i))
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continue;
|
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if (i != CPU_TO_PACKAGEINDEX(i))
|
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continue;
|
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if (max_cpu_irq <= CPU_IRQ(i))
|
|
continue;
|
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if (tmp_cpu_irq < CPU_IRQ(i)) {
|
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tmp_cpu_irq = CPU_IRQ(i);
|
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tmp_loaded = i;
|
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}
|
|
}
|
|
|
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if (tmp_loaded == -1) {
|
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/* In the case of small number of heavy interrupt sources,
|
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* loading some of the cpus too much. We use Ingo's original
|
|
* approach to rotate them around.
|
|
*/
|
|
if (!first_attempt && imbalance >= useful_load_threshold) {
|
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rotate_irqs_among_cpus(useful_load_threshold);
|
|
return;
|
|
}
|
|
goto not_worth_the_effort;
|
|
}
|
|
|
|
first_attempt = 0; /* heaviest search */
|
|
max_cpu_irq = tmp_cpu_irq; /* load */
|
|
max_loaded = tmp_loaded; /* processor */
|
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imbalance = (max_cpu_irq - min_cpu_irq) / 2;
|
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|
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Dprintk("max_loaded cpu = %d\n", max_loaded);
|
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Dprintk("min_loaded cpu = %d\n", min_loaded);
|
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Dprintk("max_cpu_irq load = %ld\n", max_cpu_irq);
|
|
Dprintk("min_cpu_irq load = %ld\n", min_cpu_irq);
|
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Dprintk("load imbalance = %lu\n", imbalance);
|
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|
|
/* if imbalance is less than approx 10% of max load, then
|
|
* observe diminishing returns action. - quit
|
|
*/
|
|
if (imbalance < (max_cpu_irq >> 3)) {
|
|
Dprintk("Imbalance too trivial\n");
|
|
goto not_worth_the_effort;
|
|
}
|
|
|
|
tryanotherirq:
|
|
/* if we select an IRQ to move that can't go where we want, then
|
|
* see if there is another one to try.
|
|
*/
|
|
move_this_load = 0;
|
|
selected_irq = -1;
|
|
for (j = 0; j < NR_IRQS; j++) {
|
|
/* Is this an active IRQ? */
|
|
if (!irq_desc[j].action)
|
|
continue;
|
|
if (imbalance <= IRQ_DELTA(max_loaded,j))
|
|
continue;
|
|
/* Try to find the IRQ that is closest to the imbalance
|
|
* without going over.
|
|
*/
|
|
if (move_this_load < IRQ_DELTA(max_loaded,j)) {
|
|
move_this_load = IRQ_DELTA(max_loaded,j);
|
|
selected_irq = j;
|
|
}
|
|
}
|
|
if (selected_irq == -1) {
|
|
goto tryanothercpu;
|
|
}
|
|
|
|
imbalance = move_this_load;
|
|
|
|
/* For physical_balance case, we accumlated both load
|
|
* values in the one of the siblings cpu_irq[],
|
|
* to use the same code for physical and logical processors
|
|
* as much as possible.
|
|
*
|
|
* NOTE: the cpu_irq[] array holds the sum of the load for
|
|
* sibling A and sibling B in the slot for the lowest numbered
|
|
* sibling (A), _AND_ the load for sibling B in the slot for
|
|
* the higher numbered sibling.
|
|
*
|
|
* We seek the least loaded sibling by making the comparison
|
|
* (A+B)/2 vs B
|
|
*/
|
|
load = CPU_IRQ(min_loaded) >> 1;
|
|
for_each_cpu_mask(j, cpu_sibling_map[min_loaded]) {
|
|
if (load > CPU_IRQ(j)) {
|
|
/* This won't change cpu_sibling_map[min_loaded] */
|
|
load = CPU_IRQ(j);
|
|
min_loaded = j;
|
|
}
|
|
}
|
|
|
|
cpus_and(allowed_mask, cpu_online_map, irq_affinity[selected_irq]);
|
|
target_cpu_mask = cpumask_of_cpu(min_loaded);
|
|
cpus_and(tmp, target_cpu_mask, allowed_mask);
|
|
|
|
if (!cpus_empty(tmp)) {
|
|
irq_desc_t *desc = irq_desc + selected_irq;
|
|
unsigned long flags;
|
|
|
|
Dprintk("irq = %d moved to cpu = %d\n",
|
|
selected_irq, min_loaded);
|
|
/* mark for change destination */
|
|
spin_lock_irqsave(&desc->lock, flags);
|
|
pending_irq_balance_cpumask[selected_irq] =
|
|
cpumask_of_cpu(min_loaded);
|
|
spin_unlock_irqrestore(&desc->lock, flags);
|
|
/* Since we made a change, come back sooner to
|
|
* check for more variation.
|
|
*/
|
|
balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
|
|
balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
|
|
return;
|
|
}
|
|
goto tryanotherirq;
|
|
|
|
not_worth_the_effort:
|
|
/*
|
|
* if we did not find an IRQ to move, then adjust the time interval
|
|
* upward
|
|
*/
|
|
balanced_irq_interval = min((long)MAX_BALANCED_IRQ_INTERVAL,
|
|
balanced_irq_interval + BALANCED_IRQ_MORE_DELTA);
|
|
Dprintk("IRQ worth rotating not found\n");
|
|
return;
|
|
}
|
|
|
|
static int balanced_irq(void *unused)
|
|
{
|
|
int i;
|
|
unsigned long prev_balance_time = jiffies;
|
|
long time_remaining = balanced_irq_interval;
|
|
|
|
daemonize("kirqd");
|
|
|
|
/* push everything to CPU 0 to give us a starting point. */
|
|
for (i = 0 ; i < NR_IRQS ; i++) {
|
|
pending_irq_balance_cpumask[i] = cpumask_of_cpu(0);
|
|
}
|
|
|
|
for ( ; ; ) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
time_remaining = schedule_timeout(time_remaining);
|
|
try_to_freeze(PF_FREEZE);
|
|
if (time_after(jiffies,
|
|
prev_balance_time+balanced_irq_interval)) {
|
|
do_irq_balance();
|
|
prev_balance_time = jiffies;
|
|
time_remaining = balanced_irq_interval;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init balanced_irq_init(void)
|
|
{
|
|
int i;
|
|
struct cpuinfo_x86 *c;
|
|
cpumask_t tmp;
|
|
|
|
cpus_shift_right(tmp, cpu_online_map, 2);
|
|
c = &boot_cpu_data;
|
|
/* When not overwritten by the command line ask subarchitecture. */
|
|
if (irqbalance_disabled == IRQBALANCE_CHECK_ARCH)
|
|
irqbalance_disabled = NO_BALANCE_IRQ;
|
|
if (irqbalance_disabled)
|
|
return 0;
|
|
|
|
/* disable irqbalance completely if there is only one processor online */
|
|
if (num_online_cpus() < 2) {
|
|
irqbalance_disabled = 1;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Enable physical balance only if more than 1 physical processor
|
|
* is present
|
|
*/
|
|
if (smp_num_siblings > 1 && !cpus_empty(tmp))
|
|
physical_balance = 1;
|
|
|
|
for (i = 0; i < NR_CPUS; i++) {
|
|
if (!cpu_online(i))
|
|
continue;
|
|
irq_cpu_data[i].irq_delta = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
|
|
irq_cpu_data[i].last_irq = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
|
|
if (irq_cpu_data[i].irq_delta == NULL || irq_cpu_data[i].last_irq == NULL) {
|
|
printk(KERN_ERR "balanced_irq_init: out of memory");
|
|
goto failed;
|
|
}
|
|
memset(irq_cpu_data[i].irq_delta,0,sizeof(unsigned long) * NR_IRQS);
|
|
memset(irq_cpu_data[i].last_irq,0,sizeof(unsigned long) * NR_IRQS);
|
|
}
|
|
|
|
printk(KERN_INFO "Starting balanced_irq\n");
|
|
if (kernel_thread(balanced_irq, NULL, CLONE_KERNEL) >= 0)
|
|
return 0;
|
|
else
|
|
printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq");
|
|
failed:
|
|
for (i = 0; i < NR_CPUS; i++) {
|
|
if(irq_cpu_data[i].irq_delta)
|
|
kfree(irq_cpu_data[i].irq_delta);
|
|
if(irq_cpu_data[i].last_irq)
|
|
kfree(irq_cpu_data[i].last_irq);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int __init irqbalance_disable(char *str)
|
|
{
|
|
irqbalance_disabled = 1;
|
|
return 0;
|
|
}
|
|
|
|
__setup("noirqbalance", irqbalance_disable);
|
|
|
|
static inline void move_irq(int irq)
|
|
{
|
|
/* note - we hold the desc->lock */
|
|
if (unlikely(!cpus_empty(pending_irq_balance_cpumask[irq]))) {
|
|
set_ioapic_affinity_irq(irq, pending_irq_balance_cpumask[irq]);
|
|
cpus_clear(pending_irq_balance_cpumask[irq]);
|
|
}
|
|
}
|
|
|
|
late_initcall(balanced_irq_init);
|
|
|
|
#else /* !CONFIG_IRQBALANCE */
|
|
static inline void move_irq(int irq) { }
|
|
#endif /* CONFIG_IRQBALANCE */
|
|
|
|
#ifndef CONFIG_SMP
|
|
void fastcall send_IPI_self(int vector)
|
|
{
|
|
unsigned int cfg;
|
|
|
|
/*
|
|
* Wait for idle.
|
|
*/
|
|
apic_wait_icr_idle();
|
|
cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL;
|
|
/*
|
|
* Send the IPI. The write to APIC_ICR fires this off.
|
|
*/
|
|
apic_write_around(APIC_ICR, cfg);
|
|
}
|
|
#endif /* !CONFIG_SMP */
|
|
|
|
|
|
/*
|
|
* support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
|
|
* specific CPU-side IRQs.
|
|
*/
|
|
|
|
#define MAX_PIRQS 8
|
|
static int pirq_entries [MAX_PIRQS];
|
|
static int pirqs_enabled;
|
|
int skip_ioapic_setup;
|
|
|
|
static int __init ioapic_setup(char *str)
|
|
{
|
|
skip_ioapic_setup = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("noapic", ioapic_setup);
|
|
|
|
static int __init ioapic_pirq_setup(char *str)
|
|
{
|
|
int i, max;
|
|
int ints[MAX_PIRQS+1];
|
|
|
|
get_options(str, ARRAY_SIZE(ints), ints);
|
|
|
|
for (i = 0; i < MAX_PIRQS; i++)
|
|
pirq_entries[i] = -1;
|
|
|
|
pirqs_enabled = 1;
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"PIRQ redirection, working around broken MP-BIOS.\n");
|
|
max = MAX_PIRQS;
|
|
if (ints[0] < MAX_PIRQS)
|
|
max = ints[0];
|
|
|
|
for (i = 0; i < max; i++) {
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
|
|
/*
|
|
* PIRQs are mapped upside down, usually.
|
|
*/
|
|
pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
__setup("pirq=", ioapic_pirq_setup);
|
|
|
|
/*
|
|
* Find the IRQ entry number of a certain pin.
|
|
*/
|
|
static int find_irq_entry(int apic, int pin, int type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mp_irq_entries; i++)
|
|
if (mp_irqs[i].mpc_irqtype == type &&
|
|
(mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
|
|
mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
|
|
mp_irqs[i].mpc_dstirq == pin)
|
|
return i;
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Find the pin to which IRQ[irq] (ISA) is connected
|
|
*/
|
|
static int find_isa_irq_pin(int irq, int type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mp_irq_entries; i++) {
|
|
int lbus = mp_irqs[i].mpc_srcbus;
|
|
|
|
if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
|
|
mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
|
|
mp_bus_id_to_type[lbus] == MP_BUS_MCA ||
|
|
mp_bus_id_to_type[lbus] == MP_BUS_NEC98
|
|
) &&
|
|
(mp_irqs[i].mpc_irqtype == type) &&
|
|
(mp_irqs[i].mpc_srcbusirq == irq))
|
|
|
|
return mp_irqs[i].mpc_dstirq;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Find a specific PCI IRQ entry.
|
|
* Not an __init, possibly needed by modules
|
|
*/
|
|
static int pin_2_irq(int idx, int apic, int pin);
|
|
|
|
int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
|
|
{
|
|
int apic, i, best_guess = -1;
|
|
|
|
apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, "
|
|
"slot:%d, pin:%d.\n", bus, slot, pin);
|
|
if (mp_bus_id_to_pci_bus[bus] == -1) {
|
|
printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
|
|
return -1;
|
|
}
|
|
for (i = 0; i < mp_irq_entries; i++) {
|
|
int lbus = mp_irqs[i].mpc_srcbus;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++)
|
|
if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
|
|
mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
|
|
break;
|
|
|
|
if ((mp_bus_id_to_type[lbus] == MP_BUS_PCI) &&
|
|
!mp_irqs[i].mpc_irqtype &&
|
|
(bus == lbus) &&
|
|
(slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
|
|
int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
|
|
|
|
if (!(apic || IO_APIC_IRQ(irq)))
|
|
continue;
|
|
|
|
if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
|
|
return irq;
|
|
/*
|
|
* Use the first all-but-pin matching entry as a
|
|
* best-guess fuzzy result for broken mptables.
|
|
*/
|
|
if (best_guess < 0)
|
|
best_guess = irq;
|
|
}
|
|
}
|
|
return best_guess;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
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);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/*
|
|
* EISA Edge/Level control register, ELCR
|
|
*/
|
|
static int EISA_ELCR(unsigned int irq)
|
|
{
|
|
if (irq < 16) {
|
|
unsigned int port = 0x4d0 + (irq >> 3);
|
|
return (inb(port) >> (irq & 7)) & 1;
|
|
}
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"Broken MPtable reports ISA irq %d\n", irq);
|
|
return 0;
|
|
}
|
|
|
|
/* EISA interrupts are always polarity zero and can be edge or level
|
|
* trigger depending on the ELCR value. If an interrupt is listed as
|
|
* EISA conforming in the MP table, that means its trigger type must
|
|
* be read in from the ELCR */
|
|
|
|
#define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mpc_srcbusirq))
|
|
#define default_EISA_polarity(idx) (0)
|
|
|
|
/* ISA interrupts are always polarity zero edge triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_ISA_trigger(idx) (0)
|
|
#define default_ISA_polarity(idx) (0)
|
|
|
|
/* PCI interrupts are always polarity one level triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_PCI_trigger(idx) (1)
|
|
#define default_PCI_polarity(idx) (1)
|
|
|
|
/* MCA interrupts are always polarity zero level triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_MCA_trigger(idx) (1)
|
|
#define default_MCA_polarity(idx) (0)
|
|
|
|
/* NEC98 interrupts are always polarity zero edge triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_NEC98_trigger(idx) (0)
|
|
#define default_NEC98_polarity(idx) (0)
|
|
|
|
static int __init MPBIOS_polarity(int idx)
|
|
{
|
|
int bus = mp_irqs[idx].mpc_srcbus;
|
|
int polarity;
|
|
|
|
/*
|
|
* Determine IRQ line polarity (high active or low active):
|
|
*/
|
|
switch (mp_irqs[idx].mpc_irqflag & 3)
|
|
{
|
|
case 0: /* conforms, ie. bus-type dependent polarity */
|
|
{
|
|
switch (mp_bus_id_to_type[bus])
|
|
{
|
|
case MP_BUS_ISA: /* ISA pin */
|
|
{
|
|
polarity = default_ISA_polarity(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_EISA: /* EISA pin */
|
|
{
|
|
polarity = default_EISA_polarity(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_PCI: /* PCI pin */
|
|
{
|
|
polarity = default_PCI_polarity(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_MCA: /* MCA pin */
|
|
{
|
|
polarity = default_MCA_polarity(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_NEC98: /* NEC 98 pin */
|
|
{
|
|
polarity = default_NEC98_polarity(idx);
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
polarity = 1;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case 1: /* high active */
|
|
{
|
|
polarity = 0;
|
|
break;
|
|
}
|
|
case 2: /* reserved */
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
polarity = 1;
|
|
break;
|
|
}
|
|
case 3: /* low active */
|
|
{
|
|
polarity = 1;
|
|
break;
|
|
}
|
|
default: /* invalid */
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
polarity = 1;
|
|
break;
|
|
}
|
|
}
|
|
return polarity;
|
|
}
|
|
|
|
static int MPBIOS_trigger(int idx)
|
|
{
|
|
int bus = mp_irqs[idx].mpc_srcbus;
|
|
int trigger;
|
|
|
|
/*
|
|
* Determine IRQ trigger mode (edge or level sensitive):
|
|
*/
|
|
switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
|
|
{
|
|
case 0: /* conforms, ie. bus-type dependent */
|
|
{
|
|
switch (mp_bus_id_to_type[bus])
|
|
{
|
|
case MP_BUS_ISA: /* ISA pin */
|
|
{
|
|
trigger = default_ISA_trigger(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_EISA: /* EISA pin */
|
|
{
|
|
trigger = default_EISA_trigger(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_PCI: /* PCI pin */
|
|
{
|
|
trigger = default_PCI_trigger(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_MCA: /* MCA pin */
|
|
{
|
|
trigger = default_MCA_trigger(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_NEC98: /* NEC 98 pin */
|
|
{
|
|
trigger = default_NEC98_trigger(idx);
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
trigger = 1;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case 1: /* edge */
|
|
{
|
|
trigger = 0;
|
|
break;
|
|
}
|
|
case 2: /* reserved */
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
trigger = 1;
|
|
break;
|
|
}
|
|
case 3: /* level */
|
|
{
|
|
trigger = 1;
|
|
break;
|
|
}
|
|
default: /* invalid */
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
trigger = 0;
|
|
break;
|
|
}
|
|
}
|
|
return trigger;
|
|
}
|
|
|
|
static inline int irq_polarity(int idx)
|
|
{
|
|
return MPBIOS_polarity(idx);
|
|
}
|
|
|
|
static inline int irq_trigger(int idx)
|
|
{
|
|
return MPBIOS_trigger(idx);
|
|
}
|
|
|
|
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");
|
|
|
|
switch (mp_bus_id_to_type[bus])
|
|
{
|
|
case MP_BUS_ISA: /* ISA pin */
|
|
case MP_BUS_EISA:
|
|
case MP_BUS_MCA:
|
|
case MP_BUS_NEC98:
|
|
{
|
|
irq = mp_irqs[idx].mpc_srcbusirq;
|
|
break;
|
|
}
|
|
case MP_BUS_PCI: /* PCI pin */
|
|
{
|
|
/*
|
|
* PCI IRQs are mapped in order
|
|
*/
|
|
i = irq = 0;
|
|
while (i < apic)
|
|
irq += nr_ioapic_registers[i++];
|
|
irq += pin;
|
|
|
|
/*
|
|
* For MPS mode, so far only needed by ES7000 platform
|
|
*/
|
|
if (ioapic_renumber_irq)
|
|
irq = ioapic_renumber_irq(apic, irq);
|
|
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
printk(KERN_ERR "unknown bus type %d.\n",bus);
|
|
irq = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* PCI IRQ command line redirection. Yes, limits are hardcoded.
|
|
*/
|
|
if ((pin >= 16) && (pin <= 23)) {
|
|
if (pirq_entries[pin-16] != -1) {
|
|
if (!pirq_entries[pin-16]) {
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"disabling PIRQ%d\n", pin-16);
|
|
} else {
|
|
irq = pirq_entries[pin-16];
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"using PIRQ%d -> IRQ %d\n",
|
|
pin-16, irq);
|
|
}
|
|
}
|
|
}
|
|
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] = { FIRST_DEVICE_VECTOR , 0 };
|
|
|
|
int assign_irq_vector(int irq)
|
|
{
|
|
static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
|
|
|
|
BUG_ON(irq >= NR_IRQ_VECTORS);
|
|
if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0)
|
|
return IO_APIC_VECTOR(irq);
|
|
next:
|
|
current_vector += 8;
|
|
if (current_vector == SYSCALL_VECTOR)
|
|
goto next;
|
|
|
|
if (current_vector >= FIRST_SYSTEM_VECTOR) {
|
|
offset++;
|
|
if (!(offset%8))
|
|
return -ENOSPC;
|
|
current_vector = FIRST_DEVICE_VECTOR + offset;
|
|
}
|
|
|
|
vector_irq[current_vector] = irq;
|
|
if (irq != AUTO_ASSIGN)
|
|
IO_APIC_VECTOR(irq) = current_vector;
|
|
|
|
return current_vector;
|
|
}
|
|
|
|
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 inline void ioapic_register_intr(int irq, int vector, unsigned long trigger)
|
|
{
|
|
if (use_pci_vector() && !platform_legacy_irq(irq)) {
|
|
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
|
|
trigger == IOAPIC_LEVEL)
|
|
irq_desc[vector].handler = &ioapic_level_type;
|
|
else
|
|
irq_desc[vector].handler = &ioapic_edge_type;
|
|
set_intr_gate(vector, interrupt[vector]);
|
|
} else {
|
|
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
|
|
trigger == IOAPIC_LEVEL)
|
|
irq_desc[irq].handler = &ioapic_level_type;
|
|
else
|
|
irq_desc[irq].handler = &ioapic_edge_type;
|
|
set_intr_gate(vector, interrupt[irq]);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
irq = pin_2_irq(idx, apic, pin);
|
|
/*
|
|
* skip adding the timer int on secondary nodes, which causes
|
|
* a small but painful rift in the time-space continuum
|
|
*/
|
|
if (multi_timer_check(apic, irq))
|
|
continue;
|
|
else
|
|
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);
|
|
}
|
|
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);
|
|
}
|
|
}
|
|
|
|
if (!first_notcon)
|
|
apic_printk(APIC_VERBOSE, " not connected.\n");
|
|
}
|
|
|
|
/*
|
|
* Set up the 8259A-master output pin:
|
|
*/
|
|
static void __init setup_ExtINT_IRQ0_pin(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_around(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].handler = &ioapic_edge_type;
|
|
|
|
/*
|
|
* Add it to the IO-APIC irq-routing table:
|
|
*/
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
|
|
io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
enable_8259A_irq(0);
|
|
}
|
|
|
|
static inline void UNEXPECTED_IO_APIC(void)
|
|
{
|
|
}
|
|
|
|
void __init 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;
|
|
union IO_APIC_reg_03 reg_03;
|
|
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);
|
|
if (reg_01.bits.version >= 0x20)
|
|
reg_03.raw = io_apic_read(apic, 3);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
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);
|
|
printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
|
|
printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
|
|
if (reg_00.bits.ID >= get_physical_broadcast())
|
|
UNEXPECTED_IO_APIC();
|
|
if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
|
|
UNEXPECTED_IO_APIC();
|
|
|
|
printk(KERN_DEBUG ".... register #01: %08X\n", reg_01.raw);
|
|
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)
|
|
)
|
|
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 != 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();
|
|
|
|
/*
|
|
* Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
|
|
* but the value of reg_02 is read as the previous read register
|
|
* value, so ignore it if reg_02 == reg_01.
|
|
*/
|
|
if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
|
|
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();
|
|
}
|
|
|
|
/*
|
|
* Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
|
|
* or reg_03, but the value of reg_0[23] is read as the previous read
|
|
* register value, so ignore it if reg_03 == reg_0[12].
|
|
*/
|
|
if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
|
|
reg_03.raw != reg_01.raw) {
|
|
printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
|
|
printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
|
|
if (reg_03.bits.__reserved_1)
|
|
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;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
*(((int *)&entry)+0) = io_apic_read(apic, 0x10+i*2);
|
|
*(((int *)&entry)+1) = io_apic_read(apic, 0x11+i*2);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
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 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 /*__init*/ 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);
|
|
|
|
if (APIC_INTEGRATED(ver)) { /* !82489DX */
|
|
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);
|
|
|
|
if (APIC_INTEGRATED(ver)) { /* !82489DX */
|
|
if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
|
|
apic_write(APIC_ESR, 0);
|
|
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 /*__init*/ print_PIC(void)
|
|
{
|
|
extern spinlock_t i8259A_lock;
|
|
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 i;
|
|
unsigned long flags;
|
|
|
|
for (i = 0; i < PIN_MAP_SIZE; i++) {
|
|
irq_2_pin[i].pin = -1;
|
|
irq_2_pin[i].next = 0;
|
|
}
|
|
if (!pirqs_enabled)
|
|
for (i = 0; i < MAX_PIRQS; i++)
|
|
pirq_entries[i] = -1;
|
|
|
|
/*
|
|
* The number of IO-APIC IRQ registers (== #pins):
|
|
*/
|
|
for (i = 0; i < nr_ioapics; i++) {
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_01.raw = io_apic_read(i, 1);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
nr_ioapic_registers[i] = reg_01.bits.entries+1;
|
|
}
|
|
|
|
/*
|
|
* 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();
|
|
|
|
disconnect_bsp_APIC();
|
|
}
|
|
|
|
/*
|
|
* function to set the IO-APIC physical IDs based on the
|
|
* values stored in the MPC table.
|
|
*
|
|
* by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
|
|
*/
|
|
|
|
#ifndef CONFIG_X86_NUMAQ
|
|
static void __init setup_ioapic_ids_from_mpc(void)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
physid_mask_t phys_id_present_map;
|
|
int apic;
|
|
int i;
|
|
unsigned char old_id;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* This is broken; anything with a real cpu count has to
|
|
* circumvent this idiocy regardless.
|
|
*/
|
|
phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map);
|
|
|
|
/*
|
|
* Set the IOAPIC ID to the value stored in the MPC table.
|
|
*/
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
|
|
/* Read the register 0 value */
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(apic, 0);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
old_id = mp_ioapics[apic].mpc_apicid;
|
|
|
|
if (mp_ioapics[apic].mpc_apicid >= get_physical_broadcast()) {
|
|
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
|
|
apic, mp_ioapics[apic].mpc_apicid);
|
|
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
|
|
reg_00.bits.ID);
|
|
mp_ioapics[apic].mpc_apicid = reg_00.bits.ID;
|
|
}
|
|
|
|
/* Don't check I/O APIC IDs for some xAPIC systems. They have
|
|
* no meaning without the serial APIC bus. */
|
|
if (NO_IOAPIC_CHECK)
|
|
continue;
|
|
/*
|
|
* Sanity check, is the ID really free? Every APIC in a
|
|
* system must have a unique ID or we get lots of nice
|
|
* 'stuck on smp_invalidate_needed IPI wait' messages.
|
|
*/
|
|
if (check_apicid_used(phys_id_present_map,
|
|
mp_ioapics[apic].mpc_apicid)) {
|
|
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
|
|
apic, mp_ioapics[apic].mpc_apicid);
|
|
for (i = 0; i < get_physical_broadcast(); i++)
|
|
if (!physid_isset(i, phys_id_present_map))
|
|
break;
|
|
if (i >= get_physical_broadcast())
|
|
panic("Max APIC ID exceeded!\n");
|
|
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
|
|
i);
|
|
physid_set(i, phys_id_present_map);
|
|
mp_ioapics[apic].mpc_apicid = i;
|
|
} else {
|
|
physid_mask_t tmp;
|
|
tmp = apicid_to_cpu_present(mp_ioapics[apic].mpc_apicid);
|
|
apic_printk(APIC_VERBOSE, "Setting %d in the "
|
|
"phys_id_present_map\n",
|
|
mp_ioapics[apic].mpc_apicid);
|
|
physids_or(phys_id_present_map, phys_id_present_map, tmp);
|
|
}
|
|
|
|
|
|
/*
|
|
* We need to adjust the IRQ routing table
|
|
* if the ID changed.
|
|
*/
|
|
if (old_id != mp_ioapics[apic].mpc_apicid)
|
|
for (i = 0; i < mp_irq_entries; i++)
|
|
if (mp_irqs[i].mpc_dstapic == old_id)
|
|
mp_irqs[i].mpc_dstapic
|
|
= mp_ioapics[apic].mpc_apicid;
|
|
|
|
/*
|
|
* Read the right value from the MPC table and
|
|
* write it into the ID register.
|
|
*/
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"...changing IO-APIC physical APIC ID to %d ...",
|
|
mp_ioapics[apic].mpc_apicid);
|
|
|
|
reg_00.bits.ID = mp_ioapics[apic].mpc_apicid;
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(apic, 0, reg_00.raw);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(apic, 0);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid)
|
|
printk("could not set ID!\n");
|
|
else
|
|
apic_printk(APIC_VERBOSE, " ok.\n");
|
|
}
|
|
}
|
|
#else
|
|
static void __init setup_ioapic_ids_from_mpc(void) { }
|
|
#endif
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
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)
|
|
{
|
|
unsigned long v;
|
|
int i;
|
|
|
|
move_irq(irq);
|
|
/*
|
|
* It appears there is an erratum which affects at least version 0x11
|
|
* of I/O APIC (that's the 82093AA and cores integrated into various
|
|
* chipsets). Under certain conditions a level-triggered interrupt is
|
|
* erroneously delivered as edge-triggered one but the respective IRR
|
|
* bit gets set nevertheless. As a result the I/O unit expects an EOI
|
|
* message but it will never arrive and further interrupts are blocked
|
|
* from the source. The exact reason is so far unknown, but the
|
|
* phenomenon was observed when two consecutive interrupt requests
|
|
* from a given source get delivered to the same CPU and the source is
|
|
* temporarily disabled in between.
|
|
*
|
|
* A workaround is to simulate an EOI message manually. We achieve it
|
|
* by setting the trigger mode to edge and then to level when the edge
|
|
* trigger mode gets detected in the TMR of a local APIC for a
|
|
* level-triggered interrupt. We mask the source for the time of the
|
|
* operation to prevent an edge-triggered interrupt escaping meanwhile.
|
|
* The idea is from Manfred Spraul. --macro
|
|
*/
|
|
i = IO_APIC_VECTOR(irq);
|
|
|
|
v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
|
|
|
|
ack_APIC_irq();
|
|
|
|
if (!(v & (1 << (i & 0x1f)))) {
|
|
atomic_inc(&irq_mis_count);
|
|
spin_lock(&ioapic_lock);
|
|
__mask_and_edge_IO_APIC_irq(irq);
|
|
__unmask_and_level_IO_APIC_irq(irq);
|
|
spin_unlock(&ioapic_lock);
|
|
}
|
|
}
|
|
|
|
#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);
|
|
|
|
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);
|
|
|
|
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);
|
|
}
|
|
|
|
static void set_ioapic_affinity_vector (unsigned int vector,
|
|
cpumask_t cpu_mask)
|
|
{
|
|
int irq = vector_to_irq(vector);
|
|
|
|
set_ioapic_affinity_irq(irq, cpu_mask);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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 = {
|
|
.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,
|
|
.set_affinity = set_ioapic_affinity,
|
|
};
|
|
|
|
static struct hw_interrupt_type ioapic_level_type = {
|
|
.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,
|
|
.set_affinity = set_ioapic_affinity,
|
|
};
|
|
|
|
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].handler = &no_irq_type;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void enable_lapic_irq (unsigned int irq)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = apic_read(APIC_LVT0);
|
|
apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED);
|
|
}
|
|
|
|
static void disable_lapic_irq (unsigned int irq)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = apic_read(APIC_LVT0);
|
|
apic_write_around(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 = {
|
|
.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.
|
|
*/
|
|
apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
|
|
|
|
on_each_cpu(enable_NMI_through_LVT0, NULL, 1, 1);
|
|
|
|
apic_printk(APIC_VERBOSE, " 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 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);
|
|
if (pin == -1)
|
|
return;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
*(((int *)&entry0) + 1) = io_apic_read(0, 0x11 + 2 * pin);
|
|
*(((int *)&entry0) + 0) = io_apic_read(0, 0x10 + 2 * pin);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
clear_IO_APIC_pin(0, 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(0, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
|
|
io_apic_write(0, 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(0, pin);
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
|
|
io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static inline void check_timer(void)
|
|
{
|
|
int pin1, 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_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
|
|
init_8259A(1);
|
|
timer_ack = 1;
|
|
enable_8259A_irq(0);
|
|
|
|
pin1 = find_isa_irq_pin(0, mp_INT);
|
|
pin2 = find_isa_irq_pin(0, mp_ExtINT);
|
|
|
|
printk(KERN_INFO "..TIMER: vector=0x%02X pin1=%d pin2=%d\n", vector, pin1, pin2);
|
|
|
|
if (pin1 != -1) {
|
|
/*
|
|
* Ok, does IRQ0 through the IOAPIC work?
|
|
*/
|
|
unmask_IO_APIC_irq(0);
|
|
if (timer_irq_works()) {
|
|
if (nmi_watchdog == NMI_IO_APIC) {
|
|
disable_8259A_irq(0);
|
|
setup_nmi();
|
|
enable_8259A_irq(0);
|
|
}
|
|
return;
|
|
}
|
|
clear_IO_APIC_pin(0, pin1);
|
|
printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to IO-APIC\n");
|
|
}
|
|
|
|
printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... ");
|
|
if (pin2 != -1) {
|
|
printk("\n..... (found pin %d) ...", pin2);
|
|
/*
|
|
* legacy devices should be connected to IO APIC #0
|
|
*/
|
|
setup_ExtINT_IRQ0_pin(pin2, vector);
|
|
if (timer_irq_works()) {
|
|
printk("works.\n");
|
|
if (pin1 != -1)
|
|
replace_pin_at_irq(0, 0, pin1, 0, pin2);
|
|
else
|
|
add_pin_to_irq(0, 0, pin2);
|
|
if (nmi_watchdog == NMI_IO_APIC) {
|
|
setup_nmi();
|
|
}
|
|
return;
|
|
}
|
|
/*
|
|
* Cleanup, just in case ...
|
|
*/
|
|
clear_IO_APIC_pin(0, pin2);
|
|
}
|
|
printk(" 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;
|
|
}
|
|
|
|
printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
|
|
|
|
disable_8259A_irq(0);
|
|
irq_desc[0].handler = &lapic_irq_type;
|
|
apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */
|
|
enable_8259A_irq(0);
|
|
|
|
if (timer_irq_works()) {
|
|
printk(" works.\n");
|
|
return;
|
|
}
|
|
apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
|
|
printk(" failed.\n");
|
|
|
|
printk(KERN_INFO "...trying to set up timer as ExtINT IRQ...");
|
|
|
|
timer_ack = 0;
|
|
init_8259A(0);
|
|
make_8259A_irq(0);
|
|
apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
|
|
|
|
unlock_ExtINT_logic();
|
|
|
|
if (timer_irq_works()) {
|
|
printk(" works.\n");
|
|
return;
|
|
}
|
|
printk(" failed :(.\n");
|
|
panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
|
|
"report. Then try booting with the 'noapic' option");
|
|
}
|
|
|
|
/*
|
|
*
|
|
* 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 << PIC_CASCADE_IR)
|
|
|
|
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;
|
|
|
|
printk("ENABLING IO-APIC IRQs\n");
|
|
|
|
/*
|
|
* Set up IO-APIC IRQ routing.
|
|
*/
|
|
if (!acpi_ioapic)
|
|
setup_ioapic_ids_from_mpc();
|
|
sync_Arb_IDs();
|
|
setup_IO_APIC_irqs();
|
|
init_IO_APIC_traps();
|
|
check_timer();
|
|
if (!acpi_ioapic)
|
|
print_IO_APIC();
|
|
}
|
|
|
|
/*
|
|
* Called after all the initialization is done. If we didnt find any
|
|
* APIC bugs then we can allow the modify fast path
|
|
*/
|
|
|
|
static int __init io_apic_bug_finalize(void)
|
|
{
|
|
if(sis_apic_bug == -1)
|
|
sis_apic_bug = 0;
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(io_apic_bug_finalize);
|
|
|
|
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;
|
|
unsigned long flags;
|
|
int i;
|
|
|
|
data = container_of(dev, struct sysfs_ioapic_data, dev);
|
|
entry = data->entry;
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
|
|
*(((int *)entry) + 1) = io_apic_read(dev->id, 0x11 + 2 * i);
|
|
*(((int *)entry) + 0) = io_apic_read(dev->id, 0x10 + 2 * i);
|
|
}
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
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);
|
|
}
|
|
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
|
|
io_apic_write(dev->id, 0x11+2*i, *(((int *)entry)+1));
|
|
io_apic_write(dev->id, 0x10+2*i, *(((int *)entry)+0));
|
|
}
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
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_BOOT
|
|
|
|
int __init io_apic_get_unique_id (int ioapic, int apic_id)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
|
|
physid_mask_t tmp;
|
|
unsigned long flags;
|
|
int i = 0;
|
|
|
|
/*
|
|
* The P4 platform supports up to 256 APIC IDs on two separate APIC
|
|
* buses (one for LAPICs, one for IOAPICs), where predecessors only
|
|
* supports up to 16 on one shared APIC bus.
|
|
*
|
|
* TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
|
|
* advantage of new APIC bus architecture.
|
|
*/
|
|
|
|
if (physids_empty(apic_id_map))
|
|
apic_id_map = ioapic_phys_id_map(phys_cpu_present_map);
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(ioapic, 0);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
if (apic_id >= get_physical_broadcast()) {
|
|
printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
|
|
"%d\n", ioapic, apic_id, reg_00.bits.ID);
|
|
apic_id = reg_00.bits.ID;
|
|
}
|
|
|
|
/*
|
|
* Every APIC in a system must have a unique ID or we get lots of nice
|
|
* 'stuck on smp_invalidate_needed IPI wait' messages.
|
|
*/
|
|
if (check_apicid_used(apic_id_map, apic_id)) {
|
|
|
|
for (i = 0; i < get_physical_broadcast(); i++) {
|
|
if (!check_apicid_used(apic_id_map, i))
|
|
break;
|
|
}
|
|
|
|
if (i == get_physical_broadcast())
|
|
panic("Max apic_id exceeded!\n");
|
|
|
|
printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
|
|
"trying %d\n", ioapic, apic_id, i);
|
|
|
|
apic_id = i;
|
|
}
|
|
|
|
tmp = apicid_to_cpu_present(apic_id);
|
|
physids_or(apic_id_map, apic_id_map, tmp);
|
|
|
|
if (reg_00.bits.ID != apic_id) {
|
|
reg_00.bits.ID = apic_id;
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(ioapic, 0, reg_00.raw);
|
|
reg_00.raw = io_apic_read(ioapic, 0);
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
/* Sanity check */
|
|
if (reg_00.bits.ID != apic_id)
|
|
panic("IOAPIC[%d]: Unable change apic_id!\n", ioapic);
|
|
}
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
|
|
|
|
return apic_id;
|
|
}
|
|
|
|
|
|
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 edge_level, int active_high_low)
|
|
{
|
|
struct IO_APIC_route_entry entry;
|
|
unsigned long flags;
|
|
|
|
if (!IO_APIC_IRQ(irq)) {
|
|
printk(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 = edge_level;
|
|
entry.polarity = active_high_low;
|
|
entry.mask = 1;
|
|
|
|
/*
|
|
* 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_DEBUG, 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,
|
|
edge_level, active_high_low);
|
|
|
|
ioapic_register_intr(irq, entry.vector, edge_level);
|
|
|
|
if (!ioapic && (irq < 16))
|
|
disable_8259A_irq(irq);
|
|
|
|
spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(ioapic, 0x11+2*pin, *(((int *)&entry)+1));
|
|
io_apic_write(ioapic, 0x10+2*pin, *(((int *)&entry)+0));
|
|
spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /*CONFIG_ACPI_BOOT*/
|