obj-$(CONFIG_X86_CPUID) += cpuid.o
obj-$(CONFIG_SMP) += smp.o smpboot.o trampoline.o tsc_sync.o
obj-y += apic.o nmi.o
-obj-y += io_apic.o mpparse.o genapic.o genapic_flat.o
+obj-y += io_apic_64.o mpparse.o genapic.o genapic_flat.o
obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_PM) += suspend.o
+++ /dev/null
-/*
- * Intel IO-APIC support for multi-Pentium hosts.
- *
- * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
- *
- * Many thanks to Stig Venaas for trying out countless experimental
- * patches and reporting/debugging problems patiently!
- *
- * (c) 1999, Multiple IO-APIC support, developed by
- * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
- * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
- * further tested and cleaned up by Zach Brown <zab@redhat.com>
- * and Ingo Molnar <mingo@redhat.com>
- *
- * Fixes
- * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
- * thanks to Eric Gilmore
- * and Rolf G. Tews
- * for testing these extensively
- * Paul Diefenbaugh : Added full ACPI support
- */
-
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/pci.h>
-#include <linux/mc146818rtc.h>
-#include <linux/acpi.h>
-#include <linux/sysdev.h>
-#include <linux/msi.h>
-#include <linux/htirq.h>
-#ifdef CONFIG_ACPI
-#include <acpi/acpi_bus.h>
-#endif
-
-#include <asm/idle.h>
-#include <asm/io.h>
-#include <asm/smp.h>
-#include <asm/desc.h>
-#include <asm/proto.h>
-#include <asm/mach_apic.h>
-#include <asm/acpi.h>
-#include <asm/dma.h>
-#include <asm/nmi.h>
-#include <asm/msidef.h>
-#include <asm/hypertransport.h>
-
-struct irq_cfg {
- cpumask_t domain;
- cpumask_t old_domain;
- unsigned move_cleanup_count;
- u8 vector;
- u8 move_in_progress : 1;
-};
-
-/* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
-struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
- [0] = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
- [1] = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
- [2] = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
- [3] = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, },
- [4] = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, },
- [5] = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, },
- [6] = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, },
- [7] = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, },
- [8] = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, },
- [9] = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, },
- [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
- [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
- [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
- [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
- [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
- [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
-};
-
-static int assign_irq_vector(int irq, cpumask_t mask);
-
-#define __apicdebuginit __init
-
-int sis_apic_bug; /* not actually supported, dummy for compile */
-
-static int no_timer_check;
-
-static int disable_timer_pin_1 __initdata;
-
-int timer_over_8254 __initdata = 1;
-
-/* Where if anywhere is the i8259 connect in external int mode */
-static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
-
-static DEFINE_SPINLOCK(ioapic_lock);
-DEFINE_SPINLOCK(vector_lock);
-
-/*
- * # of IRQ routing registers
- */
-int nr_ioapic_registers[MAX_IO_APICS];
-
-/*
- * Rough estimation of how many shared IRQs there are, can
- * be changed anytime.
- */
-#define MAX_PLUS_SHARED_IRQS NR_IRQS
-#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
-
-/*
- * This is performance-critical, we want to do it O(1)
- *
- * the indexing order of this array favors 1:1 mappings
- * between pins and IRQs.
- */
-
-static struct irq_pin_list {
- short apic, pin, next;
-} irq_2_pin[PIN_MAP_SIZE];
-
-struct io_apic {
- unsigned int index;
- unsigned int unused[3];
- unsigned int data;
-};
-
-static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
-{
- return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
- + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
-}
-
-static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
-{
- struct io_apic __iomem *io_apic = io_apic_base(apic);
- writel(reg, &io_apic->index);
- return readl(&io_apic->data);
-}
-
-static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
-{
- struct io_apic __iomem *io_apic = io_apic_base(apic);
- writel(reg, &io_apic->index);
- writel(value, &io_apic->data);
-}
-
-/*
- * Re-write a value: to be used for read-modify-write
- * cycles where the read already set up the index register.
- */
-static inline void io_apic_modify(unsigned int apic, unsigned int value)
-{
- struct io_apic __iomem *io_apic = io_apic_base(apic);
- writel(value, &io_apic->data);
-}
-
-static int io_apic_level_ack_pending(unsigned int irq)
-{
- struct irq_pin_list *entry;
- unsigned long flags;
- int pending = 0;
-
- spin_lock_irqsave(&ioapic_lock, flags);
- entry = irq_2_pin + irq;
- for (;;) {
- unsigned int reg;
- int pin;
-
- pin = entry->pin;
- if (pin == -1)
- break;
- reg = io_apic_read(entry->apic, 0x10 + pin*2);
- /* Is the remote IRR bit set? */
- pending |= (reg >> 14) & 1;
- if (!entry->next)
- break;
- entry = irq_2_pin + entry->next;
- }
- spin_unlock_irqrestore(&ioapic_lock, flags);
- return pending;
-}
-
-/*
- * Synchronize the IO-APIC and the CPU by doing
- * a dummy read from the IO-APIC
- */
-static inline void io_apic_sync(unsigned int apic)
-{
- struct io_apic __iomem *io_apic = io_apic_base(apic);
- readl(&io_apic->data);
-}
-
-#define __DO_ACTION(R, ACTION, FINAL) \
- \
-{ \
- int pin; \
- struct irq_pin_list *entry = irq_2_pin + irq; \
- \
- BUG_ON(irq >= NR_IRQS); \
- for (;;) { \
- unsigned int reg; \
- pin = entry->pin; \
- if (pin == -1) \
- break; \
- reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
- reg ACTION; \
- io_apic_modify(entry->apic, reg); \
- FINAL; \
- if (!entry->next) \
- break; \
- entry = irq_2_pin + entry->next; \
- } \
-}
-
-union entry_union {
- struct { u32 w1, w2; };
- struct IO_APIC_route_entry entry;
-};
-
-static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
-{
- union entry_union eu;
- unsigned long flags;
- spin_lock_irqsave(&ioapic_lock, flags);
- eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
- eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- return eu.entry;
-}
-
-/*
- * When we write a new IO APIC routing entry, we need to write the high
- * word first! If the mask bit in the low word is clear, we will enable
- * the interrupt, and we need to make sure the entry is fully populated
- * before that happens.
- */
-static void
-__ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
-{
- union entry_union eu;
- eu.entry = e;
- io_apic_write(apic, 0x11 + 2*pin, eu.w2);
- io_apic_write(apic, 0x10 + 2*pin, eu.w1);
-}
-
-static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
-{
- unsigned long flags;
- spin_lock_irqsave(&ioapic_lock, flags);
- __ioapic_write_entry(apic, pin, e);
- spin_unlock_irqrestore(&ioapic_lock, flags);
-}
-
-/*
- * When we mask an IO APIC routing entry, we need to write the low
- * word first, in order to set the mask bit before we change the
- * high bits!
- */
-static void ioapic_mask_entry(int apic, int pin)
-{
- unsigned long flags;
- union entry_union eu = { .entry.mask = 1 };
-
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(apic, 0x10 + 2*pin, eu.w1);
- io_apic_write(apic, 0x11 + 2*pin, eu.w2);
- spin_unlock_irqrestore(&ioapic_lock, flags);
-}
-
-#ifdef CONFIG_SMP
-static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
-{
- int apic, pin;
- struct irq_pin_list *entry = irq_2_pin + irq;
-
- BUG_ON(irq >= NR_IRQS);
- for (;;) {
- unsigned int reg;
- apic = entry->apic;
- pin = entry->pin;
- if (pin == -1)
- break;
- io_apic_write(apic, 0x11 + pin*2, dest);
- reg = io_apic_read(apic, 0x10 + pin*2);
- reg &= ~0x000000ff;
- reg |= vector;
- io_apic_modify(apic, reg);
- if (!entry->next)
- break;
- entry = irq_2_pin + entry->next;
- }
-}
-
-static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
-{
- struct irq_cfg *cfg = irq_cfg + irq;
- unsigned long flags;
- unsigned int dest;
- cpumask_t tmp;
-
- cpus_and(tmp, mask, cpu_online_map);
- if (cpus_empty(tmp))
- return;
-
- if (assign_irq_vector(irq, mask))
- return;
-
- cpus_and(tmp, cfg->domain, mask);
- dest = cpu_mask_to_apicid(tmp);
-
- /*
- * Only the high 8 bits are valid.
- */
- dest = SET_APIC_LOGICAL_ID(dest);
-
- spin_lock_irqsave(&ioapic_lock, flags);
- __target_IO_APIC_irq(irq, dest, cfg->vector);
- irq_desc[irq].affinity = mask;
- spin_unlock_irqrestore(&ioapic_lock, flags);
-}
-#endif
-
-/*
- * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
- * shared ISA-space IRQs, so we have to support them. We are super
- * fast in the common case, and fast for shared ISA-space IRQs.
- */
-static void add_pin_to_irq(unsigned int irq, int apic, int pin)
-{
- static int first_free_entry = NR_IRQS;
- struct irq_pin_list *entry = irq_2_pin + irq;
-
- BUG_ON(irq >= NR_IRQS);
- while (entry->next)
- entry = irq_2_pin + entry->next;
-
- if (entry->pin != -1) {
- entry->next = first_free_entry;
- entry = irq_2_pin + entry->next;
- if (++first_free_entry >= PIN_MAP_SIZE)
- panic("io_apic.c: ran out of irq_2_pin entries!");
- }
- entry->apic = apic;
- entry->pin = pin;
-}
-
-
-#define DO_ACTION(name,R,ACTION, FINAL) \
- \
- static void name##_IO_APIC_irq (unsigned int irq) \
- __DO_ACTION(R, ACTION, FINAL)
-
-DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) )
- /* mask = 1 */
-DO_ACTION( __unmask, 0, &= 0xfffeffff, )
- /* mask = 0 */
-
-static void mask_IO_APIC_irq (unsigned int irq)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&ioapic_lock, flags);
- __mask_IO_APIC_irq(irq);
- spin_unlock_irqrestore(&ioapic_lock, flags);
-}
-
-static void unmask_IO_APIC_irq (unsigned int irq)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&ioapic_lock, flags);
- __unmask_IO_APIC_irq(irq);
- spin_unlock_irqrestore(&ioapic_lock, flags);
-}
-
-static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
-{
- struct IO_APIC_route_entry entry;
-
- /* Check delivery_mode to be sure we're not clearing an SMI pin */
- entry = ioapic_read_entry(apic, pin);
- if (entry.delivery_mode == dest_SMI)
- return;
- /*
- * Disable it in the IO-APIC irq-routing table:
- */
- ioapic_mask_entry(apic, pin);
-}
-
-static void clear_IO_APIC (void)
-{
- int apic, pin;
-
- for (apic = 0; apic < nr_ioapics; apic++)
- for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
- clear_IO_APIC_pin(apic, pin);
-}
-
-int skip_ioapic_setup;
-int ioapic_force;
-
-static int __init parse_noapic(char *str)
-{
- disable_ioapic_setup();
- return 0;
-}
-early_param("noapic", parse_noapic);
-
-/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
-static int __init disable_timer_pin_setup(char *arg)
-{
- disable_timer_pin_1 = 1;
- return 1;
-}
-__setup("disable_timer_pin_1", disable_timer_pin_setup);
-
-static int __init setup_disable_8254_timer(char *s)
-{
- timer_over_8254 = -1;
- return 1;
-}
-static int __init setup_enable_8254_timer(char *s)
-{
- timer_over_8254 = 2;
- return 1;
-}
-
-__setup("disable_8254_timer", setup_disable_8254_timer);
-__setup("enable_8254_timer", setup_enable_8254_timer);
-
-
-/*
- * 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 __init 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 (test_bit(lbus, mp_bus_not_pci) &&
- (mp_irqs[i].mpc_irqtype == type) &&
- (mp_irqs[i].mpc_srcbusirq == irq))
-
- return mp_irqs[i].mpc_dstirq;
- }
- return -1;
-}
-
-static int __init find_isa_irq_apic(int irq, int type)
-{
- int i;
-
- for (i = 0; i < mp_irq_entries; i++) {
- int lbus = mp_irqs[i].mpc_srcbus;
-
- if (test_bit(lbus, mp_bus_not_pci) &&
- (mp_irqs[i].mpc_irqtype == type) &&
- (mp_irqs[i].mpc_srcbusirq == irq))
- break;
- }
- if (i < mp_irq_entries) {
- int apic;
- for(apic = 0; apic < nr_ioapics; apic++) {
- if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
- return apic;
- }
- }
-
- 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) {
- apic_printk(APIC_VERBOSE, "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 (!test_bit(lbus, mp_bus_not_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;
- }
- }
- BUG_ON(best_guess >= NR_IRQS);
- return best_guess;
-}
-
-/* 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)
-
-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 */
- if (test_bit(bus, mp_bus_not_pci))
- polarity = default_ISA_polarity(idx);
- else
- polarity = default_PCI_polarity(idx);
- 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 */
- if (test_bit(bus, mp_bus_not_pci))
- trigger = default_ISA_trigger(idx);
- else
- trigger = default_PCI_trigger(idx);
- 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");
-
- if (test_bit(bus, mp_bus_not_pci)) {
- irq = mp_irqs[idx].mpc_srcbusirq;
- } else {
- /*
- * PCI IRQs are mapped in order
- */
- i = irq = 0;
- while (i < apic)
- irq += nr_ioapic_registers[i++];
- irq += pin;
- }
- BUG_ON(irq >= NR_IRQS);
- return irq;
-}
-
-static int __assign_irq_vector(int irq, cpumask_t mask)
-{
- /*
- * 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. ;)
- */
- static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
- unsigned int old_vector;
- int cpu;
- struct irq_cfg *cfg;
-
- BUG_ON((unsigned)irq >= NR_IRQS);
- cfg = &irq_cfg[irq];
-
- /* Only try and allocate irqs on cpus that are present */
- cpus_and(mask, mask, cpu_online_map);
-
- if ((cfg->move_in_progress) || cfg->move_cleanup_count)
- return -EBUSY;
-
- old_vector = cfg->vector;
- if (old_vector) {
- cpumask_t tmp;
- cpus_and(tmp, cfg->domain, mask);
- if (!cpus_empty(tmp))
- return 0;
- }
-
- for_each_cpu_mask(cpu, mask) {
- cpumask_t domain, new_mask;
- int new_cpu;
- int vector, offset;
-
- domain = vector_allocation_domain(cpu);
- cpus_and(new_mask, domain, cpu_online_map);
-
- vector = current_vector;
- offset = current_offset;
-next:
- vector += 8;
- if (vector >= FIRST_SYSTEM_VECTOR) {
- /* If we run out of vectors on large boxen, must share them. */
- offset = (offset + 1) % 8;
- vector = FIRST_DEVICE_VECTOR + offset;
- }
- if (unlikely(current_vector == vector))
- continue;
- if (vector == IA32_SYSCALL_VECTOR)
- goto next;
- for_each_cpu_mask(new_cpu, new_mask)
- if (per_cpu(vector_irq, new_cpu)[vector] != -1)
- goto next;
- /* Found one! */
- current_vector = vector;
- current_offset = offset;
- if (old_vector) {
- cfg->move_in_progress = 1;
- cfg->old_domain = cfg->domain;
- }
- for_each_cpu_mask(new_cpu, new_mask)
- per_cpu(vector_irq, new_cpu)[vector] = irq;
- cfg->vector = vector;
- cfg->domain = domain;
- return 0;
- }
- return -ENOSPC;
-}
-
-static int assign_irq_vector(int irq, cpumask_t mask)
-{
- int err;
- unsigned long flags;
-
- spin_lock_irqsave(&vector_lock, flags);
- err = __assign_irq_vector(irq, mask);
- spin_unlock_irqrestore(&vector_lock, flags);
- return err;
-}
-
-static void __clear_irq_vector(int irq)
-{
- struct irq_cfg *cfg;
- cpumask_t mask;
- int cpu, vector;
-
- BUG_ON((unsigned)irq >= NR_IRQS);
- cfg = &irq_cfg[irq];
- BUG_ON(!cfg->vector);
-
- vector = cfg->vector;
- cpus_and(mask, cfg->domain, cpu_online_map);
- for_each_cpu_mask(cpu, mask)
- per_cpu(vector_irq, cpu)[vector] = -1;
-
- cfg->vector = 0;
- cfg->domain = CPU_MASK_NONE;
-}
-
-void __setup_vector_irq(int cpu)
-{
- /* Initialize vector_irq on a new cpu */
- /* This function must be called with vector_lock held */
- int irq, vector;
-
- /* Mark the inuse vectors */
- for (irq = 0; irq < NR_IRQS; ++irq) {
- if (!cpu_isset(cpu, irq_cfg[irq].domain))
- continue;
- vector = irq_cfg[irq].vector;
- per_cpu(vector_irq, cpu)[vector] = irq;
- }
- /* Mark the free vectors */
- for (vector = 0; vector < NR_VECTORS; ++vector) {
- irq = per_cpu(vector_irq, cpu)[vector];
- if (irq < 0)
- continue;
- if (!cpu_isset(cpu, irq_cfg[irq].domain))
- per_cpu(vector_irq, cpu)[vector] = -1;
- }
-}
-
-
-static struct irq_chip ioapic_chip;
-
-static void ioapic_register_intr(int irq, unsigned long trigger)
-{
- if (trigger) {
- irq_desc[irq].status |= IRQ_LEVEL;
- set_irq_chip_and_handler_name(irq, &ioapic_chip,
- handle_fasteoi_irq, "fasteoi");
- } else {
- irq_desc[irq].status &= ~IRQ_LEVEL;
- set_irq_chip_and_handler_name(irq, &ioapic_chip,
- handle_edge_irq, "edge");
- }
-}
-
-static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
- int trigger, int polarity)
-{
- struct irq_cfg *cfg = irq_cfg + irq;
- struct IO_APIC_route_entry entry;
- cpumask_t mask;
-
- if (!IO_APIC_IRQ(irq))
- return;
-
- mask = TARGET_CPUS;
- if (assign_irq_vector(irq, mask))
- return;
-
- cpus_and(mask, cfg->domain, mask);
-
- apic_printk(APIC_VERBOSE,KERN_DEBUG
- "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
- "IRQ %d Mode:%i Active:%i)\n",
- apic, mp_ioapics[apic].mpc_apicid, pin, cfg->vector,
- irq, trigger, polarity);
-
- /*
- * 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.dest = cpu_mask_to_apicid(mask);
- entry.mask = 0; /* enable IRQ */
- entry.trigger = trigger;
- entry.polarity = polarity;
- entry.vector = cfg->vector;
-
- /* Mask level triggered irqs.
- * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
- */
- if (trigger)
- entry.mask = 1;
-
- ioapic_register_intr(irq, trigger);
- if (irq < 16)
- disable_8259A_irq(irq);
-
- ioapic_write_entry(apic, pin, entry);
-}
-
-static void __init setup_IO_APIC_irqs(void)
-{
- int apic, pin, idx, irq, first_notcon = 1;
-
- 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++) {
-
- 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;
- }
-
- irq = pin_2_irq(idx, apic, pin);
- add_pin_to_irq(irq, apic, pin);
-
- setup_IO_APIC_irq(apic, pin, irq,
- irq_trigger(idx), irq_polarity(idx));
- }
- }
-
- if (!first_notcon)
- apic_printk(APIC_VERBOSE," not connected.\n");
-}
-
-/*
- * Set up the 8259A-master output pin as broadcast to all
- * CPUs.
- */
-static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
-{
- struct IO_APIC_route_entry entry;
- unsigned long flags;
-
- memset(&entry,0,sizeof(entry));
-
- disable_8259A_irq(0);
-
- /* mask LVT0 */
- apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
-
- /*
- * We use logical delivery to get the timer IRQ
- * to the first CPU.
- */
- entry.dest_mode = INT_DEST_MODE;
- entry.mask = 0; /* unmask IRQ now */
- entry.dest = 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 ...
- */
- set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
-
- /*
- * Add it to the IO-APIC irq-routing table:
- */
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
- io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
- spin_unlock_irqrestore(&ioapic_lock, flags);
-
- enable_8259A_irq(0);
-}
-
-void __apicdebuginit print_IO_APIC(void)
-{
- int apic, i;
- union IO_APIC_reg_00 reg_00;
- union IO_APIC_reg_01 reg_01;
- union IO_APIC_reg_02 reg_02;
- unsigned long flags;
-
- if (apic_verbosity == APIC_QUIET)
- return;
-
- printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
- for (i = 0; i < nr_ioapics; i++)
- printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
- mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
-
- /*
- * We are a bit conservative about what we expect. We have to
- * know about every hardware change ASAP.
- */
- printk(KERN_INFO "testing the IO APIC.......................\n");
-
- for (apic = 0; apic < nr_ioapics; apic++) {
-
- spin_lock_irqsave(&ioapic_lock, flags);
- reg_00.raw = io_apic_read(apic, 0);
- reg_01.raw = io_apic_read(apic, 1);
- if (reg_01.bits.version >= 0x10)
- reg_02.raw = io_apic_read(apic, 2);
- spin_unlock_irqrestore(&ioapic_lock, flags);
-
- printk("\n");
- printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
- printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
- printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
-
- printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
- printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
-
- 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 >= 0x10) {
- printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
- printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
- }
-
- printk(KERN_DEBUG ".... IRQ redirection table:\n");
-
- printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
- " Stat Dmod Deli Vect: \n");
-
- for (i = 0; i <= reg_01.bits.entries; i++) {
- struct IO_APIC_route_entry entry;
-
- entry = ioapic_read_entry(apic, i);
-
- printk(KERN_DEBUG " %02x %03X ",
- i,
- entry.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
- );
- }
- }
- 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;
- printk(KERN_DEBUG "IRQ%d ", i);
- for (;;) {
- printk("-> %d:%d", entry->apic, entry->pin);
- if (!entry->next)
- break;
- entry = irq_2_pin + entry->next;
- }
- printk("\n");
- }
-
- printk(KERN_INFO ".................................... done.\n");
-
- return;
-}
-
-#if 0
-
-static __apicdebuginit void print_APIC_bitfield (int base)
-{
- unsigned int v;
- int i, j;
-
- if (apic_verbosity == APIC_QUIET)
- return;
-
- printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
- for (i = 0; i < 8; i++) {
- v = apic_read(base + i*0x10);
- for (j = 0; j < 32; j++) {
- if (v & (1<<j))
- printk("1");
- else
- printk("0");
- }
- printk("\n");
- }
-}
-
-void __apicdebuginit print_local_APIC(void * dummy)
-{
- unsigned int v, ver, maxlvt;
-
- if (apic_verbosity == APIC_QUIET)
- return;
-
- printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
- smp_processor_id(), hard_smp_processor_id());
- v = apic_read(APIC_ID);
- printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
- v = apic_read(APIC_LVR);
- printk(KERN_INFO "... APIC VERSION: %08x\n", v);
- ver = GET_APIC_VERSION(v);
- maxlvt = get_maxlvt();
-
- v = apic_read(APIC_TASKPRI);
- printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
-
- v = apic_read(APIC_ARBPRI);
- printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
- v & APIC_ARBPRI_MASK);
- v = apic_read(APIC_PROCPRI);
- printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
-
- v = apic_read(APIC_EOI);
- printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
- v = apic_read(APIC_RRR);
- printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
- v = apic_read(APIC_LDR);
- printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
- v = apic_read(APIC_DFR);
- printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
- v = apic_read(APIC_SPIV);
- printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
-
- printk(KERN_DEBUG "... APIC ISR field:\n");
- print_APIC_bitfield(APIC_ISR);
- printk(KERN_DEBUG "... APIC TMR field:\n");
- print_APIC_bitfield(APIC_TMR);
- printk(KERN_DEBUG "... APIC IRR field:\n");
- print_APIC_bitfield(APIC_IRR);
-
- v = apic_read(APIC_ESR);
- printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
-
- v = apic_read(APIC_ICR);
- printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
- v = apic_read(APIC_ICR2);
- printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
-
- v = apic_read(APIC_LVTT);
- printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
-
- if (maxlvt > 3) { /* PC is LVT#4. */
- v = apic_read(APIC_LVTPC);
- printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
- }
- v = apic_read(APIC_LVT0);
- printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
- v = apic_read(APIC_LVT1);
- printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
-
- if (maxlvt > 2) { /* ERR is LVT#3. */
- v = apic_read(APIC_LVTERR);
- printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
- }
-
- v = apic_read(APIC_TMICT);
- printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
- v = apic_read(APIC_TMCCT);
- printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
- v = apic_read(APIC_TDCR);
- printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
- printk("\n");
-}
-
-void print_all_local_APICs (void)
-{
- on_each_cpu(print_local_APIC, NULL, 1, 1);
-}
-
-void __apicdebuginit print_PIC(void)
-{
- unsigned int v;
- unsigned long flags;
-
- if (apic_verbosity == APIC_QUIET)
- return;
-
- printk(KERN_DEBUG "\nprinting PIC contents\n");
-
- spin_lock_irqsave(&i8259A_lock, flags);
-
- v = inb(0xa1) << 8 | inb(0x21);
- printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
-
- v = inb(0xa0) << 8 | inb(0x20);
- printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
-
- outb(0x0b,0xa0);
- outb(0x0b,0x20);
- v = inb(0xa0) << 8 | inb(0x20);
- outb(0x0a,0xa0);
- outb(0x0a,0x20);
-
- spin_unlock_irqrestore(&i8259A_lock, flags);
-
- printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
-
- v = inb(0x4d1) << 8 | inb(0x4d0);
- printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
-}
-
-#endif /* 0 */
-
-static void __init enable_IO_APIC(void)
-{
- union IO_APIC_reg_01 reg_01;
- int i8259_apic, i8259_pin;
- int i, apic;
- unsigned long flags;
-
- for (i = 0; i < PIN_MAP_SIZE; i++) {
- irq_2_pin[i].pin = -1;
- irq_2_pin[i].next = 0;
- }
-
- /*
- * The number of IO-APIC IRQ registers (== #pins):
- */
- for (apic = 0; apic < nr_ioapics; apic++) {
- spin_lock_irqsave(&ioapic_lock, flags);
- reg_01.raw = io_apic_read(apic, 1);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- nr_ioapic_registers[apic] = reg_01.bits.entries+1;
- }
- for(apic = 0; apic < nr_ioapics; apic++) {
- int pin;
- /* See if any of the pins is in ExtINT mode */
- for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
- struct IO_APIC_route_entry entry;
- entry = ioapic_read_entry(apic, pin);
-
- /* If the interrupt line is enabled and in ExtInt mode
- * I have found the pin where the i8259 is connected.
- */
- if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
- ioapic_i8259.apic = apic;
- ioapic_i8259.pin = pin;
- goto found_i8259;
- }
- }
- }
- found_i8259:
- /* Look to see what if the MP table has reported the ExtINT */
- i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
- i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
- /* Trust the MP table if nothing is setup in the hardware */
- if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
- printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
- ioapic_i8259.pin = i8259_pin;
- ioapic_i8259.apic = i8259_apic;
- }
- /* Complain if the MP table and the hardware disagree */
- if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
- (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
- {
- printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
- }
-
- /*
- * Do not trust the IO-APIC being empty at bootup
- */
- clear_IO_APIC();
-}
-
-/*
- * Not an __init, needed by the reboot code
- */
-void disable_IO_APIC(void)
-{
- /*
- * Clear the IO-APIC before rebooting:
- */
- clear_IO_APIC();
-
- /*
- * If the i8259 is routed through an IOAPIC
- * Put that IOAPIC in virtual wire mode
- * so legacy interrupts can be delivered.
- */
- if (ioapic_i8259.pin != -1) {
- struct IO_APIC_route_entry entry;
-
- memset(&entry, 0, sizeof(entry));
- entry.mask = 0; /* Enabled */
- entry.trigger = 0; /* Edge */
- entry.irr = 0;
- entry.polarity = 0; /* High */
- entry.delivery_status = 0;
- entry.dest_mode = 0; /* Physical */
- entry.delivery_mode = dest_ExtINT; /* ExtInt */
- entry.vector = 0;
- entry.dest = GET_APIC_ID(apic_read(APIC_ID));
-
- /*
- * Add it to the IO-APIC irq-routing table:
- */
- ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
- }
-
- disconnect_bsp_APIC(ioapic_i8259.pin != -1);
-}
-
-/*
- * There is a nasty bug in some older SMP boards, their mptable lies
- * about the timer IRQ. We do the following to work around the situation:
- *
- * - timer IRQ defaults to IO-APIC IRQ
- * - if this function detects that timer IRQs are defunct, then we fall
- * back to ISA timer IRQs
- */
-static int __init timer_irq_works(void)
-{
- unsigned long t1 = jiffies;
-
- local_irq_enable();
- /* Let ten ticks pass... */
- mdelay((10 * 1000) / HZ);
-
- /*
- * Expect a few ticks at least, to be sure some possible
- * glue logic does not lock up after one or two first
- * ticks in a non-ExtINT mode. Also the local APIC
- * might have cached one ExtINT interrupt. Finally, at
- * least one tick may be lost due to delays.
- */
-
- /* jiffies wrap? */
- if (jiffies - t1 > 4)
- return 1;
- return 0;
-}
-
-/*
- * In the SMP+IOAPIC case it might happen that there are an unspecified
- * number of pending IRQ events unhandled. These cases are very rare,
- * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
- * better to do it this way as thus we do not have to be aware of
- * 'pending' interrupts in the IRQ path, except at this point.
- */
-/*
- * Edge triggered needs to resend any interrupt
- * that was delayed but this is now handled in the device
- * independent code.
- */
-
-/*
- * Starting up a edge-triggered IO-APIC interrupt is
- * nasty - we need to make sure that we get the edge.
- * If it is already asserted for some reason, we need
- * return 1 to indicate that is was pending.
- *
- * This is not complete - we should be able to fake
- * an edge even if it isn't on the 8259A...
- */
-
-static unsigned int startup_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;
-}
-
-static int ioapic_retrigger_irq(unsigned int irq)
-{
- struct irq_cfg *cfg = &irq_cfg[irq];
- cpumask_t mask;
- unsigned long flags;
-
- spin_lock_irqsave(&vector_lock, flags);
- cpus_clear(mask);
- cpu_set(first_cpu(cfg->domain), mask);
-
- send_IPI_mask(mask, cfg->vector);
- spin_unlock_irqrestore(&vector_lock, flags);
-
- return 1;
-}
-
-/*
- * Level and edge triggered IO-APIC interrupts need different handling,
- * so we use two separate IRQ descriptors. Edge triggered IRQs can be
- * handled with the level-triggered descriptor, but that one has slightly
- * more overhead. Level-triggered interrupts cannot be handled with the
- * edge-triggered handler, without risking IRQ storms and other ugly
- * races.
- */
-
-#ifdef CONFIG_SMP
-asmlinkage void smp_irq_move_cleanup_interrupt(void)
-{
- unsigned vector, me;
- ack_APIC_irq();
- exit_idle();
- irq_enter();
-
- me = smp_processor_id();
- for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
- unsigned int irq;
- struct irq_desc *desc;
- struct irq_cfg *cfg;
- irq = __get_cpu_var(vector_irq)[vector];
- if (irq >= NR_IRQS)
- continue;
-
- desc = irq_desc + irq;
- cfg = irq_cfg + irq;
- spin_lock(&desc->lock);
- if (!cfg->move_cleanup_count)
- goto unlock;
-
- if ((vector == cfg->vector) && cpu_isset(me, cfg->domain))
- goto unlock;
-
- __get_cpu_var(vector_irq)[vector] = -1;
- cfg->move_cleanup_count--;
-unlock:
- spin_unlock(&desc->lock);
- }
-
- irq_exit();
-}
-
-static void irq_complete_move(unsigned int irq)
-{
- struct irq_cfg *cfg = irq_cfg + irq;
- unsigned vector, me;
-
- if (likely(!cfg->move_in_progress))
- return;
-
- vector = ~get_irq_regs()->orig_rax;
- me = smp_processor_id();
- if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) {
- cpumask_t cleanup_mask;
-
- cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
- cfg->move_cleanup_count = cpus_weight(cleanup_mask);
- send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
- cfg->move_in_progress = 0;
- }
-}
-#else
-static inline void irq_complete_move(unsigned int irq) {}
-#endif
-
-static void ack_apic_edge(unsigned int irq)
-{
- irq_complete_move(irq);
- move_native_irq(irq);
- ack_APIC_irq();
-}
-
-static void ack_apic_level(unsigned int irq)
-{
- int do_unmask_irq = 0;
-
- irq_complete_move(irq);
-#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
- /* If we are moving the irq we need to mask it */
- if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
- do_unmask_irq = 1;
- mask_IO_APIC_irq(irq);
- }
-#endif
-
- /*
- * We must acknowledge the irq before we move it or the acknowledge will
- * not propagate properly.
- */
- ack_APIC_irq();
-
- /* Now we can move and renable the irq */
- if (unlikely(do_unmask_irq)) {
- /* Only migrate the irq if the ack has been received.
- *
- * On rare occasions the broadcast level triggered ack gets
- * delayed going to ioapics, and if we reprogram the
- * vector while Remote IRR is still set the irq will never
- * fire again.
- *
- * To prevent this scenario we read the Remote IRR bit
- * of the ioapic. This has two effects.
- * - On any sane system the read of the ioapic will
- * flush writes (and acks) going to the ioapic from
- * this cpu.
- * - We get to see if the ACK has actually been delivered.
- *
- * Based on failed experiments of reprogramming the
- * ioapic entry from outside of irq context starting
- * with masking the ioapic entry and then polling until
- * Remote IRR was clear before reprogramming the
- * ioapic I don't trust the Remote IRR bit to be
- * completey accurate.
- *
- * However there appears to be no other way to plug
- * this race, so if the Remote IRR bit is not
- * accurate and is causing problems then it is a hardware bug
- * and you can go talk to the chipset vendor about it.
- */
- if (!io_apic_level_ack_pending(irq))
- move_masked_irq(irq);
- unmask_IO_APIC_irq(irq);
- }
-}
-
-static struct irq_chip ioapic_chip __read_mostly = {
- .name = "IO-APIC",
- .startup = startup_ioapic_irq,
- .mask = mask_IO_APIC_irq,
- .unmask = unmask_IO_APIC_irq,
- .ack = ack_apic_edge,
- .eoi = ack_apic_level,
-#ifdef CONFIG_SMP
- .set_affinity = set_ioapic_affinity_irq,
-#endif
- .retrigger = ioapic_retrigger_irq,
-};
-
-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 (IO_APIC_IRQ(tmp) && !irq_cfg[tmp].vector) {
- /*
- * Hmm.. We don't have an entry for this,
- * so default to an old-fashioned 8259
- * interrupt if we can..
- */
- if (irq < 16)
- make_8259A_irq(irq);
- else
- /* Strange. Oh, well.. */
- irq_desc[irq].chip = &no_irq_chip;
- }
- }
-}
-
-static void enable_lapic_irq (unsigned int irq)
-{
- unsigned long v;
-
- v = apic_read(APIC_LVT0);
- apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
-}
-
-static void disable_lapic_irq (unsigned int irq)
-{
- unsigned long v;
-
- v = apic_read(APIC_LVT0);
- apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
-}
-
-static void ack_lapic_irq (unsigned int irq)
-{
- ack_APIC_irq();
-}
-
-static void end_lapic_irq (unsigned int i) { /* nothing */ }
-
-static struct hw_interrupt_type lapic_irq_type __read_mostly = {
- .name = "local-APIC",
- .typename = "local-APIC-edge",
- .startup = NULL, /* startup_irq() not used for IRQ0 */
- .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
- .enable = enable_lapic_irq,
- .disable = disable_lapic_irq,
- .ack = ack_lapic_irq,
- .end = end_lapic_irq,
-};
-
-static void setup_nmi (void)
-{
- /*
- * Dirty trick to enable the NMI watchdog ...
- * We put the 8259A master into AEOI mode and
- * unmask on all local APICs LVT0 as NMI.
- *
- * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
- * is from Maciej W. Rozycki - so we do not have to EOI from
- * the NMI handler or the timer interrupt.
- */
- printk(KERN_INFO "activating NMI Watchdog ...");
-
- enable_NMI_through_LVT0(NULL);
-
- printk(" done.\n");
-}
-
-/*
- * This looks a bit hackish but it's about the only one way of sending
- * a few INTA cycles to 8259As and any associated glue logic. ICR does
- * not support the ExtINT mode, unfortunately. We need to send these
- * cycles as some i82489DX-based boards have glue logic that keeps the
- * 8259A interrupt line asserted until INTA. --macro
- */
-static inline void unlock_ExtINT_logic(void)
-{
- int apic, pin, i;
- struct IO_APIC_route_entry entry0, entry1;
- unsigned char save_control, save_freq_select;
- unsigned long flags;
-
- pin = find_isa_irq_pin(8, mp_INT);
- apic = find_isa_irq_apic(8, mp_INT);
- if (pin == -1)
- return;
-
- spin_lock_irqsave(&ioapic_lock, flags);
- *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
- *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- clear_IO_APIC_pin(apic, pin);
-
- memset(&entry1, 0, sizeof(entry1));
-
- entry1.dest_mode = 0; /* physical delivery */
- entry1.mask = 0; /* unmask IRQ now */
- entry1.dest = hard_smp_processor_id();
- entry1.delivery_mode = dest_ExtINT;
- entry1.polarity = entry0.polarity;
- entry1.trigger = 0;
- entry1.vector = 0;
-
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
- io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
- spin_unlock_irqrestore(&ioapic_lock, flags);
-
- save_control = CMOS_READ(RTC_CONTROL);
- save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
- CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
- RTC_FREQ_SELECT);
- CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
-
- i = 100;
- while (i-- > 0) {
- mdelay(10);
- if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
- i -= 10;
- }
-
- CMOS_WRITE(save_control, RTC_CONTROL);
- CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
- clear_IO_APIC_pin(apic, pin);
-
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
- io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
- spin_unlock_irqrestore(&ioapic_lock, flags);
-}
-
-/*
- * This code may look a bit paranoid, but it's supposed to cooperate with
- * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
- * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
- * fanatically on his truly buggy board.
- *
- * FIXME: really need to revamp this for modern platforms only.
- */
-static inline void check_timer(void)
-{
- struct irq_cfg *cfg = irq_cfg + 0;
- int apic1, pin1, apic2, pin2;
-
- /*
- * get/set the timer IRQ vector:
- */
- disable_8259A_irq(0);
- assign_irq_vector(0, TARGET_CPUS);
-
- /*
- * Subtle, code in do_timer_interrupt() expects an AEOI
- * mode for the 8259A whenever interrupts are routed
- * through I/O APICs. Also IRQ0 has to be enabled in
- * the 8259A which implies the virtual wire has to be
- * disabled in the local APIC.
- */
- apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
- init_8259A(1);
- if (timer_over_8254 > 0)
- enable_8259A_irq(0);
-
- pin1 = find_isa_irq_pin(0, mp_INT);
- apic1 = find_isa_irq_apic(0, mp_INT);
- pin2 = ioapic_i8259.pin;
- apic2 = ioapic_i8259.apic;
-
- apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
- cfg->vector, apic1, pin1, apic2, pin2);
-
- if (pin1 != -1) {
- /*
- * Ok, does IRQ0 through the IOAPIC work?
- */
- unmask_IO_APIC_irq(0);
- if (!no_timer_check && timer_irq_works()) {
- nmi_watchdog_default();
- if (nmi_watchdog == NMI_IO_APIC) {
- disable_8259A_irq(0);
- setup_nmi();
- enable_8259A_irq(0);
- }
- if (disable_timer_pin_1 > 0)
- clear_IO_APIC_pin(0, pin1);
- return;
- }
- clear_IO_APIC_pin(apic1, pin1);
- apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
- "connected to IO-APIC\n");
- }
-
- apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
- "through the 8259A ... ");
- if (pin2 != -1) {
- apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
- apic2, pin2);
- /*
- * legacy devices should be connected to IO APIC #0
- */
- setup_ExtINT_IRQ0_pin(apic2, pin2, cfg->vector);
- if (timer_irq_works()) {
- apic_printk(APIC_VERBOSE," works.\n");
- nmi_watchdog_default();
- if (nmi_watchdog == NMI_IO_APIC) {
- setup_nmi();
- }
- return;
- }
- /*
- * Cleanup, just in case ...
- */
- clear_IO_APIC_pin(apic2, pin2);
- }
- apic_printk(APIC_VERBOSE," failed.\n");
-
- if (nmi_watchdog == NMI_IO_APIC) {
- printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
- nmi_watchdog = 0;
- }
-
- apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
-
- disable_8259A_irq(0);
- irq_desc[0].chip = &lapic_irq_type;
- apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
- enable_8259A_irq(0);
-
- if (timer_irq_works()) {
- apic_printk(APIC_VERBOSE," works.\n");
- return;
- }
- apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
- apic_printk(APIC_VERBOSE," failed.\n");
-
- apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
-
- init_8259A(0);
- make_8259A_irq(0);
- apic_write(APIC_LVT0, APIC_DM_EXTINT);
-
- unlock_ExtINT_logic();
-
- if (timer_irq_works()) {
- apic_printk(APIC_VERBOSE," works.\n");
- return;
- }
- apic_printk(APIC_VERBOSE," failed :(.\n");
- panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
-}
-
-static int __init notimercheck(char *s)
-{
- no_timer_check = 1;
- return 1;
-}
-__setup("no_timer_check", notimercheck);
-
-/*
- *
- * IRQ's that are handled by the PIC in the MPS IOAPIC case.
- * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
- * Linux doesn't really care, as it's not actually used
- * for any interrupt handling anyway.
- */
-#define PIC_IRQS (1<<2)
-
-void __init setup_IO_APIC(void)
-{
- enable_IO_APIC();
-
- if (acpi_ioapic)
- io_apic_irqs = ~0; /* all IRQs go through IOAPIC */
- else
- io_apic_irqs = ~PIC_IRQS;
-
- apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
-
- sync_Arb_IDs();
- setup_IO_APIC_irqs();
- init_IO_APIC_traps();
- check_timer();
- if (!acpi_ioapic)
- print_IO_APIC();
-}
-
-struct sysfs_ioapic_data {
- struct sys_device dev;
- struct IO_APIC_route_entry entry[0];
-};
-static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
-
-static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
-{
- struct IO_APIC_route_entry *entry;
- struct sysfs_ioapic_data *data;
- int i;
-
- data = container_of(dev, struct sysfs_ioapic_data, dev);
- entry = data->entry;
- for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
- *entry = ioapic_read_entry(dev->id, i);
-
- return 0;
-}
-
-static int ioapic_resume(struct sys_device *dev)
-{
- struct IO_APIC_route_entry *entry;
- struct sysfs_ioapic_data *data;
- unsigned long flags;
- union IO_APIC_reg_00 reg_00;
- int i;
-
- data = container_of(dev, struct sysfs_ioapic_data, dev);
- entry = data->entry;
-
- spin_lock_irqsave(&ioapic_lock, flags);
- reg_00.raw = io_apic_read(dev->id, 0);
- if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
- reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
- io_apic_write(dev->id, 0, reg_00.raw);
- }
- spin_unlock_irqrestore(&ioapic_lock, flags);
- for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
- ioapic_write_entry(dev->id, i, entry[i]);
-
- return 0;
-}
-
-static struct sysdev_class ioapic_sysdev_class = {
- set_kset_name("ioapic"),
- .suspend = ioapic_suspend,
- .resume = ioapic_resume,
-};
-
-static int __init ioapic_init_sysfs(void)
-{
- struct sys_device * dev;
- int i, size, error = 0;
-
- error = sysdev_class_register(&ioapic_sysdev_class);
- if (error)
- return error;
-
- for (i = 0; i < nr_ioapics; i++ ) {
- size = sizeof(struct sys_device) + nr_ioapic_registers[i]
- * sizeof(struct IO_APIC_route_entry);
- mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
- if (!mp_ioapic_data[i]) {
- printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
- continue;
- }
- memset(mp_ioapic_data[i], 0, size);
- dev = &mp_ioapic_data[i]->dev;
- dev->id = i;
- dev->cls = &ioapic_sysdev_class;
- error = sysdev_register(dev);
- if (error) {
- kfree(mp_ioapic_data[i]);
- mp_ioapic_data[i] = NULL;
- printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
- continue;
- }
- }
-
- return 0;
-}
-
-device_initcall(ioapic_init_sysfs);
-
-/*
- * Dynamic irq allocate and deallocation
- */
-int create_irq(void)
-{
- /* Allocate an unused irq */
- int irq;
- int new;
- unsigned long flags;
-
- irq = -ENOSPC;
- spin_lock_irqsave(&vector_lock, flags);
- for (new = (NR_IRQS - 1); new >= 0; new--) {
- if (platform_legacy_irq(new))
- continue;
- if (irq_cfg[new].vector != 0)
- continue;
- if (__assign_irq_vector(new, TARGET_CPUS) == 0)
- irq = new;
- break;
- }
- spin_unlock_irqrestore(&vector_lock, flags);
-
- if (irq >= 0) {
- dynamic_irq_init(irq);
- }
- return irq;
-}
-
-void destroy_irq(unsigned int irq)
-{
- unsigned long flags;
-
- dynamic_irq_cleanup(irq);
-
- spin_lock_irqsave(&vector_lock, flags);
- __clear_irq_vector(irq);
- spin_unlock_irqrestore(&vector_lock, flags);
-}
-
-/*
- * MSI mesage composition
- */
-#ifdef CONFIG_PCI_MSI
-static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
-{
- struct irq_cfg *cfg = irq_cfg + irq;
- int err;
- unsigned dest;
- cpumask_t tmp;
-
- tmp = TARGET_CPUS;
- err = assign_irq_vector(irq, tmp);
- if (!err) {
- cpus_and(tmp, cfg->domain, tmp);
- dest = cpu_mask_to_apicid(tmp);
-
- msg->address_hi = MSI_ADDR_BASE_HI;
- msg->address_lo =
- MSI_ADDR_BASE_LO |
- ((INT_DEST_MODE == 0) ?
- MSI_ADDR_DEST_MODE_PHYSICAL:
- MSI_ADDR_DEST_MODE_LOGICAL) |
- ((INT_DELIVERY_MODE != dest_LowestPrio) ?
- MSI_ADDR_REDIRECTION_CPU:
- MSI_ADDR_REDIRECTION_LOWPRI) |
- MSI_ADDR_DEST_ID(dest);
-
- msg->data =
- MSI_DATA_TRIGGER_EDGE |
- MSI_DATA_LEVEL_ASSERT |
- ((INT_DELIVERY_MODE != dest_LowestPrio) ?
- MSI_DATA_DELIVERY_FIXED:
- MSI_DATA_DELIVERY_LOWPRI) |
- MSI_DATA_VECTOR(cfg->vector);
- }
- return err;
-}
-
-#ifdef CONFIG_SMP
-static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
-{
- struct irq_cfg *cfg = irq_cfg + irq;
- struct msi_msg msg;
- unsigned int dest;
- cpumask_t tmp;
-
- cpus_and(tmp, mask, cpu_online_map);
- if (cpus_empty(tmp))
- return;
-
- if (assign_irq_vector(irq, mask))
- return;
-
- cpus_and(tmp, cfg->domain, mask);
- dest = cpu_mask_to_apicid(tmp);
-
- read_msi_msg(irq, &msg);
-
- msg.data &= ~MSI_DATA_VECTOR_MASK;
- msg.data |= MSI_DATA_VECTOR(cfg->vector);
- msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
- msg.address_lo |= MSI_ADDR_DEST_ID(dest);
-
- write_msi_msg(irq, &msg);
- irq_desc[irq].affinity = mask;
-}
-#endif /* CONFIG_SMP */
-
-/*
- * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
- * which implement the MSI or MSI-X Capability Structure.
- */
-static struct irq_chip msi_chip = {
- .name = "PCI-MSI",
- .unmask = unmask_msi_irq,
- .mask = mask_msi_irq,
- .ack = ack_apic_edge,
-#ifdef CONFIG_SMP
- .set_affinity = set_msi_irq_affinity,
-#endif
- .retrigger = ioapic_retrigger_irq,
-};
-
-int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
-{
- struct msi_msg msg;
- int irq, ret;
- irq = create_irq();
- if (irq < 0)
- return irq;
-
- ret = msi_compose_msg(dev, irq, &msg);
- if (ret < 0) {
- destroy_irq(irq);
- return ret;
- }
-
- set_irq_msi(irq, desc);
- write_msi_msg(irq, &msg);
-
- set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
-
- return 0;
-}
-
-void arch_teardown_msi_irq(unsigned int irq)
-{
- destroy_irq(irq);
-}
-
-#endif /* CONFIG_PCI_MSI */
-
-/*
- * Hypertransport interrupt support
- */
-#ifdef CONFIG_HT_IRQ
-
-#ifdef CONFIG_SMP
-
-static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
-{
- struct ht_irq_msg msg;
- fetch_ht_irq_msg(irq, &msg);
-
- msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
- msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
-
- msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
- msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
-
- write_ht_irq_msg(irq, &msg);
-}
-
-static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
-{
- struct irq_cfg *cfg = irq_cfg + irq;
- unsigned int dest;
- cpumask_t tmp;
-
- cpus_and(tmp, mask, cpu_online_map);
- if (cpus_empty(tmp))
- return;
-
- if (assign_irq_vector(irq, mask))
- return;
-
- cpus_and(tmp, cfg->domain, mask);
- dest = cpu_mask_to_apicid(tmp);
-
- target_ht_irq(irq, dest, cfg->vector);
- irq_desc[irq].affinity = mask;
-}
-#endif
-
-static struct irq_chip ht_irq_chip = {
- .name = "PCI-HT",
- .mask = mask_ht_irq,
- .unmask = unmask_ht_irq,
- .ack = ack_apic_edge,
-#ifdef CONFIG_SMP
- .set_affinity = set_ht_irq_affinity,
-#endif
- .retrigger = ioapic_retrigger_irq,
-};
-
-int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
-{
- struct irq_cfg *cfg = irq_cfg + irq;
- int err;
- cpumask_t tmp;
-
- tmp = TARGET_CPUS;
- err = assign_irq_vector(irq, tmp);
- if (!err) {
- struct ht_irq_msg msg;
- unsigned dest;
-
- cpus_and(tmp, cfg->domain, tmp);
- dest = cpu_mask_to_apicid(tmp);
-
- msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
-
- msg.address_lo =
- HT_IRQ_LOW_BASE |
- HT_IRQ_LOW_DEST_ID(dest) |
- HT_IRQ_LOW_VECTOR(cfg->vector) |
- ((INT_DEST_MODE == 0) ?
- HT_IRQ_LOW_DM_PHYSICAL :
- HT_IRQ_LOW_DM_LOGICAL) |
- HT_IRQ_LOW_RQEOI_EDGE |
- ((INT_DELIVERY_MODE != dest_LowestPrio) ?
- HT_IRQ_LOW_MT_FIXED :
- HT_IRQ_LOW_MT_ARBITRATED) |
- HT_IRQ_LOW_IRQ_MASKED;
-
- write_ht_irq_msg(irq, &msg);
-
- set_irq_chip_and_handler_name(irq, &ht_irq_chip,
- handle_edge_irq, "edge");
- }
- return err;
-}
-#endif /* CONFIG_HT_IRQ */
-
-/* --------------------------------------------------------------------------
- ACPI-based IOAPIC Configuration
- -------------------------------------------------------------------------- */
-
-#ifdef CONFIG_ACPI
-
-#define IO_APIC_MAX_ID 0xFE
-
-int __init io_apic_get_redir_entries (int ioapic)
-{
- union IO_APIC_reg_01 reg_01;
- unsigned long flags;
-
- spin_lock_irqsave(&ioapic_lock, flags);
- reg_01.raw = io_apic_read(ioapic, 1);
- spin_unlock_irqrestore(&ioapic_lock, flags);
-
- return reg_01.bits.entries;
-}
-
-
-int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
-{
- if (!IO_APIC_IRQ(irq)) {
- apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
- ioapic);
- return -EINVAL;
- }
-
- /*
- * IRQs < 16 are already in the irq_2_pin[] map
- */
- if (irq >= 16)
- add_pin_to_irq(irq, ioapic, pin);
-
- setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
-
- return 0;
-}
-
-#endif /* CONFIG_ACPI */
-
-
-/*
- * This function currently is only a helper for the i386 smp boot process where
- * we need to reprogram the ioredtbls to cater for the cpus which have come online
- * so mask in all cases should simply be TARGET_CPUS
- */
-#ifdef CONFIG_SMP
-void __init setup_ioapic_dest(void)
-{
- int pin, ioapic, irq, irq_entry;
-
- if (skip_ioapic_setup == 1)
- return;
-
- for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
- for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
- irq_entry = find_irq_entry(ioapic, pin, mp_INT);
- if (irq_entry == -1)
- continue;
- irq = pin_2_irq(irq_entry, ioapic, pin);
-
- /* setup_IO_APIC_irqs could fail to get vector for some device
- * when you have too many devices, because at that time only boot
- * cpu is online.
- */
- if (!irq_cfg[irq].vector)
- setup_IO_APIC_irq(ioapic, pin, irq,
- irq_trigger(irq_entry),
- irq_polarity(irq_entry));
- else
- set_ioapic_affinity_irq(irq, TARGET_CPUS);
- }
-
- }
-}
-#endif
--- /dev/null
+/*
+ * Intel IO-APIC support for multi-Pentium hosts.
+ *
+ * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
+ *
+ * Many thanks to Stig Venaas for trying out countless experimental
+ * patches and reporting/debugging problems patiently!
+ *
+ * (c) 1999, Multiple IO-APIC support, developed by
+ * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
+ * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
+ * further tested and cleaned up by Zach Brown <zab@redhat.com>
+ * and Ingo Molnar <mingo@redhat.com>
+ *
+ * Fixes
+ * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
+ * thanks to Eric Gilmore
+ * and Rolf G. Tews
+ * for testing these extensively
+ * Paul Diefenbaugh : Added full ACPI support
+ */
+
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/mc146818rtc.h>
+#include <linux/acpi.h>
+#include <linux/sysdev.h>
+#include <linux/msi.h>
+#include <linux/htirq.h>
+#ifdef CONFIG_ACPI
+#include <acpi/acpi_bus.h>
+#endif
+
+#include <asm/idle.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/desc.h>
+#include <asm/proto.h>
+#include <asm/mach_apic.h>
+#include <asm/acpi.h>
+#include <asm/dma.h>
+#include <asm/nmi.h>
+#include <asm/msidef.h>
+#include <asm/hypertransport.h>
+
+struct irq_cfg {
+ cpumask_t domain;
+ cpumask_t old_domain;
+ unsigned move_cleanup_count;
+ u8 vector;
+ u8 move_in_progress : 1;
+};
+
+/* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
+struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
+ [0] = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
+ [1] = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
+ [2] = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
+ [3] = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, },
+ [4] = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, },
+ [5] = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, },
+ [6] = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, },
+ [7] = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, },
+ [8] = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, },
+ [9] = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, },
+ [10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
+ [11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
+ [12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
+ [13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
+ [14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
+ [15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
+};
+
+static int assign_irq_vector(int irq, cpumask_t mask);
+
+#define __apicdebuginit __init
+
+int sis_apic_bug; /* not actually supported, dummy for compile */
+
+static int no_timer_check;
+
+static int disable_timer_pin_1 __initdata;
+
+int timer_over_8254 __initdata = 1;
+
+/* Where if anywhere is the i8259 connect in external int mode */
+static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
+
+static DEFINE_SPINLOCK(ioapic_lock);
+DEFINE_SPINLOCK(vector_lock);
+
+/*
+ * # of IRQ routing registers
+ */
+int nr_ioapic_registers[MAX_IO_APICS];
+
+/*
+ * Rough estimation of how many shared IRQs there are, can
+ * be changed anytime.
+ */
+#define MAX_PLUS_SHARED_IRQS NR_IRQS
+#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
+
+/*
+ * This is performance-critical, we want to do it O(1)
+ *
+ * the indexing order of this array favors 1:1 mappings
+ * between pins and IRQs.
+ */
+
+static struct irq_pin_list {
+ short apic, pin, next;
+} irq_2_pin[PIN_MAP_SIZE];
+
+struct io_apic {
+ unsigned int index;
+ unsigned int unused[3];
+ unsigned int data;
+};
+
+static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
+{
+ return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
+ + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
+}
+
+static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
+{
+ struct io_apic __iomem *io_apic = io_apic_base(apic);
+ writel(reg, &io_apic->index);
+ return readl(&io_apic->data);
+}
+
+static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+{
+ struct io_apic __iomem *io_apic = io_apic_base(apic);
+ writel(reg, &io_apic->index);
+ writel(value, &io_apic->data);
+}
+
+/*
+ * Re-write a value: to be used for read-modify-write
+ * cycles where the read already set up the index register.
+ */
+static inline void io_apic_modify(unsigned int apic, unsigned int value)
+{
+ struct io_apic __iomem *io_apic = io_apic_base(apic);
+ writel(value, &io_apic->data);
+}
+
+static int io_apic_level_ack_pending(unsigned int irq)
+{
+ struct irq_pin_list *entry;
+ unsigned long flags;
+ int pending = 0;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ entry = irq_2_pin + irq;
+ for (;;) {
+ unsigned int reg;
+ int pin;
+
+ pin = entry->pin;
+ if (pin == -1)
+ break;
+ reg = io_apic_read(entry->apic, 0x10 + pin*2);
+ /* Is the remote IRR bit set? */
+ pending |= (reg >> 14) & 1;
+ if (!entry->next)
+ break;
+ entry = irq_2_pin + entry->next;
+ }
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ return pending;
+}
+
+/*
+ * Synchronize the IO-APIC and the CPU by doing
+ * a dummy read from the IO-APIC
+ */
+static inline void io_apic_sync(unsigned int apic)
+{
+ struct io_apic __iomem *io_apic = io_apic_base(apic);
+ readl(&io_apic->data);
+}
+
+#define __DO_ACTION(R, ACTION, FINAL) \
+ \
+{ \
+ int pin; \
+ struct irq_pin_list *entry = irq_2_pin + irq; \
+ \
+ BUG_ON(irq >= NR_IRQS); \
+ for (;;) { \
+ unsigned int reg; \
+ pin = entry->pin; \
+ if (pin == -1) \
+ break; \
+ reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
+ reg ACTION; \
+ io_apic_modify(entry->apic, reg); \
+ FINAL; \
+ if (!entry->next) \
+ break; \
+ entry = irq_2_pin + entry->next; \
+ } \
+}
+
+union entry_union {
+ struct { u32 w1, w2; };
+ struct IO_APIC_route_entry entry;
+};
+
+static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
+{
+ union entry_union eu;
+ unsigned long flags;
+ spin_lock_irqsave(&ioapic_lock, flags);
+ eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
+ eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ return eu.entry;
+}
+
+/*
+ * When we write a new IO APIC routing entry, we need to write the high
+ * word first! If the mask bit in the low word is clear, we will enable
+ * the interrupt, and we need to make sure the entry is fully populated
+ * before that happens.
+ */
+static void
+__ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
+{
+ union entry_union eu;
+ eu.entry = e;
+ io_apic_write(apic, 0x11 + 2*pin, eu.w2);
+ io_apic_write(apic, 0x10 + 2*pin, eu.w1);
+}
+
+static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&ioapic_lock, flags);
+ __ioapic_write_entry(apic, pin, e);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+/*
+ * When we mask an IO APIC routing entry, we need to write the low
+ * word first, in order to set the mask bit before we change the
+ * high bits!
+ */
+static void ioapic_mask_entry(int apic, int pin)
+{
+ unsigned long flags;
+ union entry_union eu = { .entry.mask = 1 };
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(apic, 0x10 + 2*pin, eu.w1);
+ io_apic_write(apic, 0x11 + 2*pin, eu.w2);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+#ifdef CONFIG_SMP
+static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
+{
+ int apic, pin;
+ struct irq_pin_list *entry = irq_2_pin + irq;
+
+ BUG_ON(irq >= NR_IRQS);
+ for (;;) {
+ unsigned int reg;
+ apic = entry->apic;
+ pin = entry->pin;
+ if (pin == -1)
+ break;
+ io_apic_write(apic, 0x11 + pin*2, dest);
+ reg = io_apic_read(apic, 0x10 + pin*2);
+ reg &= ~0x000000ff;
+ reg |= vector;
+ io_apic_modify(apic, reg);
+ if (!entry->next)
+ break;
+ entry = irq_2_pin + entry->next;
+ }
+}
+
+static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ unsigned long flags;
+ unsigned int dest;
+ cpumask_t tmp;
+
+ cpus_and(tmp, mask, cpu_online_map);
+ if (cpus_empty(tmp))
+ return;
+
+ if (assign_irq_vector(irq, mask))
+ return;
+
+ cpus_and(tmp, cfg->domain, mask);
+ dest = cpu_mask_to_apicid(tmp);
+
+ /*
+ * Only the high 8 bits are valid.
+ */
+ dest = SET_APIC_LOGICAL_ID(dest);
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ __target_IO_APIC_irq(irq, dest, cfg->vector);
+ irq_desc[irq].affinity = mask;
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+#endif
+
+/*
+ * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
+ * shared ISA-space IRQs, so we have to support them. We are super
+ * fast in the common case, and fast for shared ISA-space IRQs.
+ */
+static void add_pin_to_irq(unsigned int irq, int apic, int pin)
+{
+ static int first_free_entry = NR_IRQS;
+ struct irq_pin_list *entry = irq_2_pin + irq;
+
+ BUG_ON(irq >= NR_IRQS);
+ while (entry->next)
+ entry = irq_2_pin + entry->next;
+
+ if (entry->pin != -1) {
+ entry->next = first_free_entry;
+ entry = irq_2_pin + entry->next;
+ if (++first_free_entry >= PIN_MAP_SIZE)
+ panic("io_apic.c: ran out of irq_2_pin entries!");
+ }
+ entry->apic = apic;
+ entry->pin = pin;
+}
+
+
+#define DO_ACTION(name,R,ACTION, FINAL) \
+ \
+ static void name##_IO_APIC_irq (unsigned int irq) \
+ __DO_ACTION(R, ACTION, FINAL)
+
+DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) )
+ /* mask = 1 */
+DO_ACTION( __unmask, 0, &= 0xfffeffff, )
+ /* mask = 0 */
+
+static void mask_IO_APIC_irq (unsigned int irq)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ __mask_IO_APIC_irq(irq);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+static void unmask_IO_APIC_irq (unsigned int irq)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ __unmask_IO_APIC_irq(irq);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
+{
+ struct IO_APIC_route_entry entry;
+
+ /* Check delivery_mode to be sure we're not clearing an SMI pin */
+ entry = ioapic_read_entry(apic, pin);
+ if (entry.delivery_mode == dest_SMI)
+ return;
+ /*
+ * Disable it in the IO-APIC irq-routing table:
+ */
+ ioapic_mask_entry(apic, pin);
+}
+
+static void clear_IO_APIC (void)
+{
+ int apic, pin;
+
+ for (apic = 0; apic < nr_ioapics; apic++)
+ for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
+ clear_IO_APIC_pin(apic, pin);
+}
+
+int skip_ioapic_setup;
+int ioapic_force;
+
+static int __init parse_noapic(char *str)
+{
+ disable_ioapic_setup();
+ return 0;
+}
+early_param("noapic", parse_noapic);
+
+/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
+static int __init disable_timer_pin_setup(char *arg)
+{
+ disable_timer_pin_1 = 1;
+ return 1;
+}
+__setup("disable_timer_pin_1", disable_timer_pin_setup);
+
+static int __init setup_disable_8254_timer(char *s)
+{
+ timer_over_8254 = -1;
+ return 1;
+}
+static int __init setup_enable_8254_timer(char *s)
+{
+ timer_over_8254 = 2;
+ return 1;
+}
+
+__setup("disable_8254_timer", setup_disable_8254_timer);
+__setup("enable_8254_timer", setup_enable_8254_timer);
+
+
+/*
+ * 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 __init 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 (test_bit(lbus, mp_bus_not_pci) &&
+ (mp_irqs[i].mpc_irqtype == type) &&
+ (mp_irqs[i].mpc_srcbusirq == irq))
+
+ return mp_irqs[i].mpc_dstirq;
+ }
+ return -1;
+}
+
+static int __init find_isa_irq_apic(int irq, int type)
+{
+ int i;
+
+ for (i = 0; i < mp_irq_entries; i++) {
+ int lbus = mp_irqs[i].mpc_srcbus;
+
+ if (test_bit(lbus, mp_bus_not_pci) &&
+ (mp_irqs[i].mpc_irqtype == type) &&
+ (mp_irqs[i].mpc_srcbusirq == irq))
+ break;
+ }
+ if (i < mp_irq_entries) {
+ int apic;
+ for(apic = 0; apic < nr_ioapics; apic++) {
+ if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
+ return apic;
+ }
+ }
+
+ 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) {
+ apic_printk(APIC_VERBOSE, "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 (!test_bit(lbus, mp_bus_not_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;
+ }
+ }
+ BUG_ON(best_guess >= NR_IRQS);
+ return best_guess;
+}
+
+/* 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)
+
+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 */
+ if (test_bit(bus, mp_bus_not_pci))
+ polarity = default_ISA_polarity(idx);
+ else
+ polarity = default_PCI_polarity(idx);
+ 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 */
+ if (test_bit(bus, mp_bus_not_pci))
+ trigger = default_ISA_trigger(idx);
+ else
+ trigger = default_PCI_trigger(idx);
+ 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");
+
+ if (test_bit(bus, mp_bus_not_pci)) {
+ irq = mp_irqs[idx].mpc_srcbusirq;
+ } else {
+ /*
+ * PCI IRQs are mapped in order
+ */
+ i = irq = 0;
+ while (i < apic)
+ irq += nr_ioapic_registers[i++];
+ irq += pin;
+ }
+ BUG_ON(irq >= NR_IRQS);
+ return irq;
+}
+
+static int __assign_irq_vector(int irq, cpumask_t mask)
+{
+ /*
+ * 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. ;)
+ */
+ static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
+ unsigned int old_vector;
+ int cpu;
+ struct irq_cfg *cfg;
+
+ BUG_ON((unsigned)irq >= NR_IRQS);
+ cfg = &irq_cfg[irq];
+
+ /* Only try and allocate irqs on cpus that are present */
+ cpus_and(mask, mask, cpu_online_map);
+
+ if ((cfg->move_in_progress) || cfg->move_cleanup_count)
+ return -EBUSY;
+
+ old_vector = cfg->vector;
+ if (old_vector) {
+ cpumask_t tmp;
+ cpus_and(tmp, cfg->domain, mask);
+ if (!cpus_empty(tmp))
+ return 0;
+ }
+
+ for_each_cpu_mask(cpu, mask) {
+ cpumask_t domain, new_mask;
+ int new_cpu;
+ int vector, offset;
+
+ domain = vector_allocation_domain(cpu);
+ cpus_and(new_mask, domain, cpu_online_map);
+
+ vector = current_vector;
+ offset = current_offset;
+next:
+ vector += 8;
+ if (vector >= FIRST_SYSTEM_VECTOR) {
+ /* If we run out of vectors on large boxen, must share them. */
+ offset = (offset + 1) % 8;
+ vector = FIRST_DEVICE_VECTOR + offset;
+ }
+ if (unlikely(current_vector == vector))
+ continue;
+ if (vector == IA32_SYSCALL_VECTOR)
+ goto next;
+ for_each_cpu_mask(new_cpu, new_mask)
+ if (per_cpu(vector_irq, new_cpu)[vector] != -1)
+ goto next;
+ /* Found one! */
+ current_vector = vector;
+ current_offset = offset;
+ if (old_vector) {
+ cfg->move_in_progress = 1;
+ cfg->old_domain = cfg->domain;
+ }
+ for_each_cpu_mask(new_cpu, new_mask)
+ per_cpu(vector_irq, new_cpu)[vector] = irq;
+ cfg->vector = vector;
+ cfg->domain = domain;
+ return 0;
+ }
+ return -ENOSPC;
+}
+
+static int assign_irq_vector(int irq, cpumask_t mask)
+{
+ int err;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ err = __assign_irq_vector(irq, mask);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ return err;
+}
+
+static void __clear_irq_vector(int irq)
+{
+ struct irq_cfg *cfg;
+ cpumask_t mask;
+ int cpu, vector;
+
+ BUG_ON((unsigned)irq >= NR_IRQS);
+ cfg = &irq_cfg[irq];
+ BUG_ON(!cfg->vector);
+
+ vector = cfg->vector;
+ cpus_and(mask, cfg->domain, cpu_online_map);
+ for_each_cpu_mask(cpu, mask)
+ per_cpu(vector_irq, cpu)[vector] = -1;
+
+ cfg->vector = 0;
+ cfg->domain = CPU_MASK_NONE;
+}
+
+void __setup_vector_irq(int cpu)
+{
+ /* Initialize vector_irq on a new cpu */
+ /* This function must be called with vector_lock held */
+ int irq, vector;
+
+ /* Mark the inuse vectors */
+ for (irq = 0; irq < NR_IRQS; ++irq) {
+ if (!cpu_isset(cpu, irq_cfg[irq].domain))
+ continue;
+ vector = irq_cfg[irq].vector;
+ per_cpu(vector_irq, cpu)[vector] = irq;
+ }
+ /* Mark the free vectors */
+ for (vector = 0; vector < NR_VECTORS; ++vector) {
+ irq = per_cpu(vector_irq, cpu)[vector];
+ if (irq < 0)
+ continue;
+ if (!cpu_isset(cpu, irq_cfg[irq].domain))
+ per_cpu(vector_irq, cpu)[vector] = -1;
+ }
+}
+
+
+static struct irq_chip ioapic_chip;
+
+static void ioapic_register_intr(int irq, unsigned long trigger)
+{
+ if (trigger) {
+ irq_desc[irq].status |= IRQ_LEVEL;
+ set_irq_chip_and_handler_name(irq, &ioapic_chip,
+ handle_fasteoi_irq, "fasteoi");
+ } else {
+ irq_desc[irq].status &= ~IRQ_LEVEL;
+ set_irq_chip_and_handler_name(irq, &ioapic_chip,
+ handle_edge_irq, "edge");
+ }
+}
+
+static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
+ int trigger, int polarity)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ struct IO_APIC_route_entry entry;
+ cpumask_t mask;
+
+ if (!IO_APIC_IRQ(irq))
+ return;
+
+ mask = TARGET_CPUS;
+ if (assign_irq_vector(irq, mask))
+ return;
+
+ cpus_and(mask, cfg->domain, mask);
+
+ apic_printk(APIC_VERBOSE,KERN_DEBUG
+ "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
+ "IRQ %d Mode:%i Active:%i)\n",
+ apic, mp_ioapics[apic].mpc_apicid, pin, cfg->vector,
+ irq, trigger, polarity);
+
+ /*
+ * 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.dest = cpu_mask_to_apicid(mask);
+ entry.mask = 0; /* enable IRQ */
+ entry.trigger = trigger;
+ entry.polarity = polarity;
+ entry.vector = cfg->vector;
+
+ /* Mask level triggered irqs.
+ * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
+ */
+ if (trigger)
+ entry.mask = 1;
+
+ ioapic_register_intr(irq, trigger);
+ if (irq < 16)
+ disable_8259A_irq(irq);
+
+ ioapic_write_entry(apic, pin, entry);
+}
+
+static void __init setup_IO_APIC_irqs(void)
+{
+ int apic, pin, idx, irq, first_notcon = 1;
+
+ 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++) {
+
+ 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;
+ }
+
+ irq = pin_2_irq(idx, apic, pin);
+ add_pin_to_irq(irq, apic, pin);
+
+ setup_IO_APIC_irq(apic, pin, irq,
+ irq_trigger(idx), irq_polarity(idx));
+ }
+ }
+
+ if (!first_notcon)
+ apic_printk(APIC_VERBOSE," not connected.\n");
+}
+
+/*
+ * Set up the 8259A-master output pin as broadcast to all
+ * CPUs.
+ */
+static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
+{
+ struct IO_APIC_route_entry entry;
+ unsigned long flags;
+
+ memset(&entry,0,sizeof(entry));
+
+ disable_8259A_irq(0);
+
+ /* mask LVT0 */
+ apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
+
+ /*
+ * We use logical delivery to get the timer IRQ
+ * to the first CPU.
+ */
+ entry.dest_mode = INT_DEST_MODE;
+ entry.mask = 0; /* unmask IRQ now */
+ entry.dest = 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 ...
+ */
+ set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
+
+ /*
+ * Add it to the IO-APIC irq-routing table:
+ */
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
+ io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ enable_8259A_irq(0);
+}
+
+void __apicdebuginit print_IO_APIC(void)
+{
+ int apic, i;
+ union IO_APIC_reg_00 reg_00;
+ union IO_APIC_reg_01 reg_01;
+ union IO_APIC_reg_02 reg_02;
+ unsigned long flags;
+
+ if (apic_verbosity == APIC_QUIET)
+ return;
+
+ printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
+ for (i = 0; i < nr_ioapics; i++)
+ printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
+ mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
+
+ /*
+ * We are a bit conservative about what we expect. We have to
+ * know about every hardware change ASAP.
+ */
+ printk(KERN_INFO "testing the IO APIC.......................\n");
+
+ for (apic = 0; apic < nr_ioapics; apic++) {
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ reg_00.raw = io_apic_read(apic, 0);
+ reg_01.raw = io_apic_read(apic, 1);
+ if (reg_01.bits.version >= 0x10)
+ reg_02.raw = io_apic_read(apic, 2);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ printk("\n");
+ printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
+ printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
+ printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
+
+ printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
+ printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
+
+ 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 >= 0x10) {
+ printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
+ printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
+ }
+
+ printk(KERN_DEBUG ".... IRQ redirection table:\n");
+
+ printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
+ " Stat Dmod Deli Vect: \n");
+
+ for (i = 0; i <= reg_01.bits.entries; i++) {
+ struct IO_APIC_route_entry entry;
+
+ entry = ioapic_read_entry(apic, i);
+
+ printk(KERN_DEBUG " %02x %03X ",
+ i,
+ entry.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
+ );
+ }
+ }
+ 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;
+ printk(KERN_DEBUG "IRQ%d ", i);
+ for (;;) {
+ printk("-> %d:%d", entry->apic, entry->pin);
+ if (!entry->next)
+ break;
+ entry = irq_2_pin + entry->next;
+ }
+ printk("\n");
+ }
+
+ printk(KERN_INFO ".................................... done.\n");
+
+ return;
+}
+
+#if 0
+
+static __apicdebuginit void print_APIC_bitfield (int base)
+{
+ unsigned int v;
+ int i, j;
+
+ if (apic_verbosity == APIC_QUIET)
+ return;
+
+ printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
+ for (i = 0; i < 8; i++) {
+ v = apic_read(base + i*0x10);
+ for (j = 0; j < 32; j++) {
+ if (v & (1<<j))
+ printk("1");
+ else
+ printk("0");
+ }
+ printk("\n");
+ }
+}
+
+void __apicdebuginit print_local_APIC(void * dummy)
+{
+ unsigned int v, ver, maxlvt;
+
+ if (apic_verbosity == APIC_QUIET)
+ return;
+
+ printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
+ smp_processor_id(), hard_smp_processor_id());
+ v = apic_read(APIC_ID);
+ printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
+ v = apic_read(APIC_LVR);
+ printk(KERN_INFO "... APIC VERSION: %08x\n", v);
+ ver = GET_APIC_VERSION(v);
+ maxlvt = get_maxlvt();
+
+ v = apic_read(APIC_TASKPRI);
+ printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
+
+ v = apic_read(APIC_ARBPRI);
+ printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
+ v & APIC_ARBPRI_MASK);
+ v = apic_read(APIC_PROCPRI);
+ printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
+
+ v = apic_read(APIC_EOI);
+ printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
+ v = apic_read(APIC_RRR);
+ printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
+ v = apic_read(APIC_LDR);
+ printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
+ v = apic_read(APIC_DFR);
+ printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
+ v = apic_read(APIC_SPIV);
+ printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
+
+ printk(KERN_DEBUG "... APIC ISR field:\n");
+ print_APIC_bitfield(APIC_ISR);
+ printk(KERN_DEBUG "... APIC TMR field:\n");
+ print_APIC_bitfield(APIC_TMR);
+ printk(KERN_DEBUG "... APIC IRR field:\n");
+ print_APIC_bitfield(APIC_IRR);
+
+ v = apic_read(APIC_ESR);
+ printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
+
+ v = apic_read(APIC_ICR);
+ printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
+ v = apic_read(APIC_ICR2);
+ printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
+
+ v = apic_read(APIC_LVTT);
+ printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
+
+ if (maxlvt > 3) { /* PC is LVT#4. */
+ v = apic_read(APIC_LVTPC);
+ printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
+ }
+ v = apic_read(APIC_LVT0);
+ printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
+ v = apic_read(APIC_LVT1);
+ printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
+
+ if (maxlvt > 2) { /* ERR is LVT#3. */
+ v = apic_read(APIC_LVTERR);
+ printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
+ }
+
+ v = apic_read(APIC_TMICT);
+ printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
+ v = apic_read(APIC_TMCCT);
+ printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
+ v = apic_read(APIC_TDCR);
+ printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
+ printk("\n");
+}
+
+void print_all_local_APICs (void)
+{
+ on_each_cpu(print_local_APIC, NULL, 1, 1);
+}
+
+void __apicdebuginit print_PIC(void)
+{
+ unsigned int v;
+ unsigned long flags;
+
+ if (apic_verbosity == APIC_QUIET)
+ return;
+
+ printk(KERN_DEBUG "\nprinting PIC contents\n");
+
+ spin_lock_irqsave(&i8259A_lock, flags);
+
+ v = inb(0xa1) << 8 | inb(0x21);
+ printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
+
+ v = inb(0xa0) << 8 | inb(0x20);
+ printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
+
+ outb(0x0b,0xa0);
+ outb(0x0b,0x20);
+ v = inb(0xa0) << 8 | inb(0x20);
+ outb(0x0a,0xa0);
+ outb(0x0a,0x20);
+
+ spin_unlock_irqrestore(&i8259A_lock, flags);
+
+ printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
+
+ v = inb(0x4d1) << 8 | inb(0x4d0);
+ printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
+}
+
+#endif /* 0 */
+
+static void __init enable_IO_APIC(void)
+{
+ union IO_APIC_reg_01 reg_01;
+ int i8259_apic, i8259_pin;
+ int i, apic;
+ unsigned long flags;
+
+ for (i = 0; i < PIN_MAP_SIZE; i++) {
+ irq_2_pin[i].pin = -1;
+ irq_2_pin[i].next = 0;
+ }
+
+ /*
+ * The number of IO-APIC IRQ registers (== #pins):
+ */
+ for (apic = 0; apic < nr_ioapics; apic++) {
+ spin_lock_irqsave(&ioapic_lock, flags);
+ reg_01.raw = io_apic_read(apic, 1);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ nr_ioapic_registers[apic] = reg_01.bits.entries+1;
+ }
+ for(apic = 0; apic < nr_ioapics; apic++) {
+ int pin;
+ /* See if any of the pins is in ExtINT mode */
+ for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
+ struct IO_APIC_route_entry entry;
+ entry = ioapic_read_entry(apic, pin);
+
+ /* If the interrupt line is enabled and in ExtInt mode
+ * I have found the pin where the i8259 is connected.
+ */
+ if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
+ ioapic_i8259.apic = apic;
+ ioapic_i8259.pin = pin;
+ goto found_i8259;
+ }
+ }
+ }
+ found_i8259:
+ /* Look to see what if the MP table has reported the ExtINT */
+ i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
+ i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
+ /* Trust the MP table if nothing is setup in the hardware */
+ if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
+ printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
+ ioapic_i8259.pin = i8259_pin;
+ ioapic_i8259.apic = i8259_apic;
+ }
+ /* Complain if the MP table and the hardware disagree */
+ if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
+ (i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
+ {
+ printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
+ }
+
+ /*
+ * Do not trust the IO-APIC being empty at bootup
+ */
+ clear_IO_APIC();
+}
+
+/*
+ * Not an __init, needed by the reboot code
+ */
+void disable_IO_APIC(void)
+{
+ /*
+ * Clear the IO-APIC before rebooting:
+ */
+ clear_IO_APIC();
+
+ /*
+ * If the i8259 is routed through an IOAPIC
+ * Put that IOAPIC in virtual wire mode
+ * so legacy interrupts can be delivered.
+ */
+ if (ioapic_i8259.pin != -1) {
+ struct IO_APIC_route_entry entry;
+
+ memset(&entry, 0, sizeof(entry));
+ entry.mask = 0; /* Enabled */
+ entry.trigger = 0; /* Edge */
+ entry.irr = 0;
+ entry.polarity = 0; /* High */
+ entry.delivery_status = 0;
+ entry.dest_mode = 0; /* Physical */
+ entry.delivery_mode = dest_ExtINT; /* ExtInt */
+ entry.vector = 0;
+ entry.dest = GET_APIC_ID(apic_read(APIC_ID));
+
+ /*
+ * Add it to the IO-APIC irq-routing table:
+ */
+ ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
+ }
+
+ disconnect_bsp_APIC(ioapic_i8259.pin != -1);
+}
+
+/*
+ * There is a nasty bug in some older SMP boards, their mptable lies
+ * about the timer IRQ. We do the following to work around the situation:
+ *
+ * - timer IRQ defaults to IO-APIC IRQ
+ * - if this function detects that timer IRQs are defunct, then we fall
+ * back to ISA timer IRQs
+ */
+static int __init timer_irq_works(void)
+{
+ unsigned long t1 = jiffies;
+
+ local_irq_enable();
+ /* Let ten ticks pass... */
+ mdelay((10 * 1000) / HZ);
+
+ /*
+ * Expect a few ticks at least, to be sure some possible
+ * glue logic does not lock up after one or two first
+ * ticks in a non-ExtINT mode. Also the local APIC
+ * might have cached one ExtINT interrupt. Finally, at
+ * least one tick may be lost due to delays.
+ */
+
+ /* jiffies wrap? */
+ if (jiffies - t1 > 4)
+ return 1;
+ return 0;
+}
+
+/*
+ * In the SMP+IOAPIC case it might happen that there are an unspecified
+ * number of pending IRQ events unhandled. These cases are very rare,
+ * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
+ * better to do it this way as thus we do not have to be aware of
+ * 'pending' interrupts in the IRQ path, except at this point.
+ */
+/*
+ * Edge triggered needs to resend any interrupt
+ * that was delayed but this is now handled in the device
+ * independent code.
+ */
+
+/*
+ * Starting up a edge-triggered IO-APIC interrupt is
+ * nasty - we need to make sure that we get the edge.
+ * If it is already asserted for some reason, we need
+ * return 1 to indicate that is was pending.
+ *
+ * This is not complete - we should be able to fake
+ * an edge even if it isn't on the 8259A...
+ */
+
+static unsigned int startup_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;
+}
+
+static int ioapic_retrigger_irq(unsigned int irq)
+{
+ struct irq_cfg *cfg = &irq_cfg[irq];
+ cpumask_t mask;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ cpus_clear(mask);
+ cpu_set(first_cpu(cfg->domain), mask);
+
+ send_IPI_mask(mask, cfg->vector);
+ spin_unlock_irqrestore(&vector_lock, flags);
+
+ return 1;
+}
+
+/*
+ * Level and edge triggered IO-APIC interrupts need different handling,
+ * so we use two separate IRQ descriptors. Edge triggered IRQs can be
+ * handled with the level-triggered descriptor, but that one has slightly
+ * more overhead. Level-triggered interrupts cannot be handled with the
+ * edge-triggered handler, without risking IRQ storms and other ugly
+ * races.
+ */
+
+#ifdef CONFIG_SMP
+asmlinkage void smp_irq_move_cleanup_interrupt(void)
+{
+ unsigned vector, me;
+ ack_APIC_irq();
+ exit_idle();
+ irq_enter();
+
+ me = smp_processor_id();
+ for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
+ unsigned int irq;
+ struct irq_desc *desc;
+ struct irq_cfg *cfg;
+ irq = __get_cpu_var(vector_irq)[vector];
+ if (irq >= NR_IRQS)
+ continue;
+
+ desc = irq_desc + irq;
+ cfg = irq_cfg + irq;
+ spin_lock(&desc->lock);
+ if (!cfg->move_cleanup_count)
+ goto unlock;
+
+ if ((vector == cfg->vector) && cpu_isset(me, cfg->domain))
+ goto unlock;
+
+ __get_cpu_var(vector_irq)[vector] = -1;
+ cfg->move_cleanup_count--;
+unlock:
+ spin_unlock(&desc->lock);
+ }
+
+ irq_exit();
+}
+
+static void irq_complete_move(unsigned int irq)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ unsigned vector, me;
+
+ if (likely(!cfg->move_in_progress))
+ return;
+
+ vector = ~get_irq_regs()->orig_rax;
+ me = smp_processor_id();
+ if ((vector == cfg->vector) && cpu_isset(me, cfg->domain)) {
+ cpumask_t cleanup_mask;
+
+ cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
+ cfg->move_cleanup_count = cpus_weight(cleanup_mask);
+ send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
+ cfg->move_in_progress = 0;
+ }
+}
+#else
+static inline void irq_complete_move(unsigned int irq) {}
+#endif
+
+static void ack_apic_edge(unsigned int irq)
+{
+ irq_complete_move(irq);
+ move_native_irq(irq);
+ ack_APIC_irq();
+}
+
+static void ack_apic_level(unsigned int irq)
+{
+ int do_unmask_irq = 0;
+
+ irq_complete_move(irq);
+#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
+ /* If we are moving the irq we need to mask it */
+ if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
+ do_unmask_irq = 1;
+ mask_IO_APIC_irq(irq);
+ }
+#endif
+
+ /*
+ * We must acknowledge the irq before we move it or the acknowledge will
+ * not propagate properly.
+ */
+ ack_APIC_irq();
+
+ /* Now we can move and renable the irq */
+ if (unlikely(do_unmask_irq)) {
+ /* Only migrate the irq if the ack has been received.
+ *
+ * On rare occasions the broadcast level triggered ack gets
+ * delayed going to ioapics, and if we reprogram the
+ * vector while Remote IRR is still set the irq will never
+ * fire again.
+ *
+ * To prevent this scenario we read the Remote IRR bit
+ * of the ioapic. This has two effects.
+ * - On any sane system the read of the ioapic will
+ * flush writes (and acks) going to the ioapic from
+ * this cpu.
+ * - We get to see if the ACK has actually been delivered.
+ *
+ * Based on failed experiments of reprogramming the
+ * ioapic entry from outside of irq context starting
+ * with masking the ioapic entry and then polling until
+ * Remote IRR was clear before reprogramming the
+ * ioapic I don't trust the Remote IRR bit to be
+ * completey accurate.
+ *
+ * However there appears to be no other way to plug
+ * this race, so if the Remote IRR bit is not
+ * accurate and is causing problems then it is a hardware bug
+ * and you can go talk to the chipset vendor about it.
+ */
+ if (!io_apic_level_ack_pending(irq))
+ move_masked_irq(irq);
+ unmask_IO_APIC_irq(irq);
+ }
+}
+
+static struct irq_chip ioapic_chip __read_mostly = {
+ .name = "IO-APIC",
+ .startup = startup_ioapic_irq,
+ .mask = mask_IO_APIC_irq,
+ .unmask = unmask_IO_APIC_irq,
+ .ack = ack_apic_edge,
+ .eoi = ack_apic_level,
+#ifdef CONFIG_SMP
+ .set_affinity = set_ioapic_affinity_irq,
+#endif
+ .retrigger = ioapic_retrigger_irq,
+};
+
+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 (IO_APIC_IRQ(tmp) && !irq_cfg[tmp].vector) {
+ /*
+ * Hmm.. We don't have an entry for this,
+ * so default to an old-fashioned 8259
+ * interrupt if we can..
+ */
+ if (irq < 16)
+ make_8259A_irq(irq);
+ else
+ /* Strange. Oh, well.. */
+ irq_desc[irq].chip = &no_irq_chip;
+ }
+ }
+}
+
+static void enable_lapic_irq (unsigned int irq)
+{
+ unsigned long v;
+
+ v = apic_read(APIC_LVT0);
+ apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
+}
+
+static void disable_lapic_irq (unsigned int irq)
+{
+ unsigned long v;
+
+ v = apic_read(APIC_LVT0);
+ apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
+}
+
+static void ack_lapic_irq (unsigned int irq)
+{
+ ack_APIC_irq();
+}
+
+static void end_lapic_irq (unsigned int i) { /* nothing */ }
+
+static struct hw_interrupt_type lapic_irq_type __read_mostly = {
+ .name = "local-APIC",
+ .typename = "local-APIC-edge",
+ .startup = NULL, /* startup_irq() not used for IRQ0 */
+ .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
+ .enable = enable_lapic_irq,
+ .disable = disable_lapic_irq,
+ .ack = ack_lapic_irq,
+ .end = end_lapic_irq,
+};
+
+static void setup_nmi (void)
+{
+ /*
+ * Dirty trick to enable the NMI watchdog ...
+ * We put the 8259A master into AEOI mode and
+ * unmask on all local APICs LVT0 as NMI.
+ *
+ * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
+ * is from Maciej W. Rozycki - so we do not have to EOI from
+ * the NMI handler or the timer interrupt.
+ */
+ printk(KERN_INFO "activating NMI Watchdog ...");
+
+ enable_NMI_through_LVT0(NULL);
+
+ printk(" done.\n");
+}
+
+/*
+ * This looks a bit hackish but it's about the only one way of sending
+ * a few INTA cycles to 8259As and any associated glue logic. ICR does
+ * not support the ExtINT mode, unfortunately. We need to send these
+ * cycles as some i82489DX-based boards have glue logic that keeps the
+ * 8259A interrupt line asserted until INTA. --macro
+ */
+static inline void unlock_ExtINT_logic(void)
+{
+ int apic, pin, i;
+ struct IO_APIC_route_entry entry0, entry1;
+ unsigned char save_control, save_freq_select;
+ unsigned long flags;
+
+ pin = find_isa_irq_pin(8, mp_INT);
+ apic = find_isa_irq_apic(8, mp_INT);
+ if (pin == -1)
+ return;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
+ *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ clear_IO_APIC_pin(apic, pin);
+
+ memset(&entry1, 0, sizeof(entry1));
+
+ entry1.dest_mode = 0; /* physical delivery */
+ entry1.mask = 0; /* unmask IRQ now */
+ entry1.dest = hard_smp_processor_id();
+ entry1.delivery_mode = dest_ExtINT;
+ entry1.polarity = entry0.polarity;
+ entry1.trigger = 0;
+ entry1.vector = 0;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
+ io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ save_control = CMOS_READ(RTC_CONTROL);
+ save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
+ CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
+ RTC_FREQ_SELECT);
+ CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
+
+ i = 100;
+ while (i-- > 0) {
+ mdelay(10);
+ if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
+ i -= 10;
+ }
+
+ CMOS_WRITE(save_control, RTC_CONTROL);
+ CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
+ clear_IO_APIC_pin(apic, pin);
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
+ io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+/*
+ * This code may look a bit paranoid, but it's supposed to cooperate with
+ * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
+ * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
+ * fanatically on his truly buggy board.
+ *
+ * FIXME: really need to revamp this for modern platforms only.
+ */
+static inline void check_timer(void)
+{
+ struct irq_cfg *cfg = irq_cfg + 0;
+ int apic1, pin1, apic2, pin2;
+
+ /*
+ * get/set the timer IRQ vector:
+ */
+ disable_8259A_irq(0);
+ assign_irq_vector(0, TARGET_CPUS);
+
+ /*
+ * Subtle, code in do_timer_interrupt() expects an AEOI
+ * mode for the 8259A whenever interrupts are routed
+ * through I/O APICs. Also IRQ0 has to be enabled in
+ * the 8259A which implies the virtual wire has to be
+ * disabled in the local APIC.
+ */
+ apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
+ init_8259A(1);
+ if (timer_over_8254 > 0)
+ enable_8259A_irq(0);
+
+ pin1 = find_isa_irq_pin(0, mp_INT);
+ apic1 = find_isa_irq_apic(0, mp_INT);
+ pin2 = ioapic_i8259.pin;
+ apic2 = ioapic_i8259.apic;
+
+ apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
+ cfg->vector, apic1, pin1, apic2, pin2);
+
+ if (pin1 != -1) {
+ /*
+ * Ok, does IRQ0 through the IOAPIC work?
+ */
+ unmask_IO_APIC_irq(0);
+ if (!no_timer_check && timer_irq_works()) {
+ nmi_watchdog_default();
+ if (nmi_watchdog == NMI_IO_APIC) {
+ disable_8259A_irq(0);
+ setup_nmi();
+ enable_8259A_irq(0);
+ }
+ if (disable_timer_pin_1 > 0)
+ clear_IO_APIC_pin(0, pin1);
+ return;
+ }
+ clear_IO_APIC_pin(apic1, pin1);
+ apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not "
+ "connected to IO-APIC\n");
+ }
+
+ apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) "
+ "through the 8259A ... ");
+ if (pin2 != -1) {
+ apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...",
+ apic2, pin2);
+ /*
+ * legacy devices should be connected to IO APIC #0
+ */
+ setup_ExtINT_IRQ0_pin(apic2, pin2, cfg->vector);
+ if (timer_irq_works()) {
+ apic_printk(APIC_VERBOSE," works.\n");
+ nmi_watchdog_default();
+ if (nmi_watchdog == NMI_IO_APIC) {
+ setup_nmi();
+ }
+ return;
+ }
+ /*
+ * Cleanup, just in case ...
+ */
+ clear_IO_APIC_pin(apic2, pin2);
+ }
+ apic_printk(APIC_VERBOSE," failed.\n");
+
+ if (nmi_watchdog == NMI_IO_APIC) {
+ printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
+ nmi_watchdog = 0;
+ }
+
+ apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
+
+ disable_8259A_irq(0);
+ irq_desc[0].chip = &lapic_irq_type;
+ apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
+ enable_8259A_irq(0);
+
+ if (timer_irq_works()) {
+ apic_printk(APIC_VERBOSE," works.\n");
+ return;
+ }
+ apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
+ apic_printk(APIC_VERBOSE," failed.\n");
+
+ apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
+
+ init_8259A(0);
+ make_8259A_irq(0);
+ apic_write(APIC_LVT0, APIC_DM_EXTINT);
+
+ unlock_ExtINT_logic();
+
+ if (timer_irq_works()) {
+ apic_printk(APIC_VERBOSE," works.\n");
+ return;
+ }
+ apic_printk(APIC_VERBOSE," failed :(.\n");
+ panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
+}
+
+static int __init notimercheck(char *s)
+{
+ no_timer_check = 1;
+ return 1;
+}
+__setup("no_timer_check", notimercheck);
+
+/*
+ *
+ * IRQ's that are handled by the PIC in the MPS IOAPIC case.
+ * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
+ * Linux doesn't really care, as it's not actually used
+ * for any interrupt handling anyway.
+ */
+#define PIC_IRQS (1<<2)
+
+void __init setup_IO_APIC(void)
+{
+ enable_IO_APIC();
+
+ if (acpi_ioapic)
+ io_apic_irqs = ~0; /* all IRQs go through IOAPIC */
+ else
+ io_apic_irqs = ~PIC_IRQS;
+
+ apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
+
+ sync_Arb_IDs();
+ setup_IO_APIC_irqs();
+ init_IO_APIC_traps();
+ check_timer();
+ if (!acpi_ioapic)
+ print_IO_APIC();
+}
+
+struct sysfs_ioapic_data {
+ struct sys_device dev;
+ struct IO_APIC_route_entry entry[0];
+};
+static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
+
+static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
+{
+ struct IO_APIC_route_entry *entry;
+ struct sysfs_ioapic_data *data;
+ int i;
+
+ data = container_of(dev, struct sysfs_ioapic_data, dev);
+ entry = data->entry;
+ for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
+ *entry = ioapic_read_entry(dev->id, i);
+
+ return 0;
+}
+
+static int ioapic_resume(struct sys_device *dev)
+{
+ struct IO_APIC_route_entry *entry;
+ struct sysfs_ioapic_data *data;
+ unsigned long flags;
+ union IO_APIC_reg_00 reg_00;
+ int i;
+
+ data = container_of(dev, struct sysfs_ioapic_data, dev);
+ entry = data->entry;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ reg_00.raw = io_apic_read(dev->id, 0);
+ if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
+ reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
+ io_apic_write(dev->id, 0, reg_00.raw);
+ }
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
+ ioapic_write_entry(dev->id, i, entry[i]);
+
+ return 0;
+}
+
+static struct sysdev_class ioapic_sysdev_class = {
+ set_kset_name("ioapic"),
+ .suspend = ioapic_suspend,
+ .resume = ioapic_resume,
+};
+
+static int __init ioapic_init_sysfs(void)
+{
+ struct sys_device * dev;
+ int i, size, error = 0;
+
+ error = sysdev_class_register(&ioapic_sysdev_class);
+ if (error)
+ return error;
+
+ for (i = 0; i < nr_ioapics; i++ ) {
+ size = sizeof(struct sys_device) + nr_ioapic_registers[i]
+ * sizeof(struct IO_APIC_route_entry);
+ mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
+ if (!mp_ioapic_data[i]) {
+ printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
+ continue;
+ }
+ memset(mp_ioapic_data[i], 0, size);
+ dev = &mp_ioapic_data[i]->dev;
+ dev->id = i;
+ dev->cls = &ioapic_sysdev_class;
+ error = sysdev_register(dev);
+ if (error) {
+ kfree(mp_ioapic_data[i]);
+ mp_ioapic_data[i] = NULL;
+ printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
+ continue;
+ }
+ }
+
+ return 0;
+}
+
+device_initcall(ioapic_init_sysfs);
+
+/*
+ * Dynamic irq allocate and deallocation
+ */
+int create_irq(void)
+{
+ /* Allocate an unused irq */
+ int irq;
+ int new;
+ unsigned long flags;
+
+ irq = -ENOSPC;
+ spin_lock_irqsave(&vector_lock, flags);
+ for (new = (NR_IRQS - 1); new >= 0; new--) {
+ if (platform_legacy_irq(new))
+ continue;
+ if (irq_cfg[new].vector != 0)
+ continue;
+ if (__assign_irq_vector(new, TARGET_CPUS) == 0)
+ irq = new;
+ break;
+ }
+ spin_unlock_irqrestore(&vector_lock, flags);
+
+ if (irq >= 0) {
+ dynamic_irq_init(irq);
+ }
+ return irq;
+}
+
+void destroy_irq(unsigned int irq)
+{
+ unsigned long flags;
+
+ dynamic_irq_cleanup(irq);
+
+ spin_lock_irqsave(&vector_lock, flags);
+ __clear_irq_vector(irq);
+ spin_unlock_irqrestore(&vector_lock, flags);
+}
+
+/*
+ * MSI mesage composition
+ */
+#ifdef CONFIG_PCI_MSI
+static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ int err;
+ unsigned dest;
+ cpumask_t tmp;
+
+ tmp = TARGET_CPUS;
+ err = assign_irq_vector(irq, tmp);
+ if (!err) {
+ cpus_and(tmp, cfg->domain, tmp);
+ dest = cpu_mask_to_apicid(tmp);
+
+ msg->address_hi = MSI_ADDR_BASE_HI;
+ msg->address_lo =
+ MSI_ADDR_BASE_LO |
+ ((INT_DEST_MODE == 0) ?
+ MSI_ADDR_DEST_MODE_PHYSICAL:
+ MSI_ADDR_DEST_MODE_LOGICAL) |
+ ((INT_DELIVERY_MODE != dest_LowestPrio) ?
+ MSI_ADDR_REDIRECTION_CPU:
+ MSI_ADDR_REDIRECTION_LOWPRI) |
+ MSI_ADDR_DEST_ID(dest);
+
+ msg->data =
+ MSI_DATA_TRIGGER_EDGE |
+ MSI_DATA_LEVEL_ASSERT |
+ ((INT_DELIVERY_MODE != dest_LowestPrio) ?
+ MSI_DATA_DELIVERY_FIXED:
+ MSI_DATA_DELIVERY_LOWPRI) |
+ MSI_DATA_VECTOR(cfg->vector);
+ }
+ return err;
+}
+
+#ifdef CONFIG_SMP
+static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ struct msi_msg msg;
+ unsigned int dest;
+ cpumask_t tmp;
+
+ cpus_and(tmp, mask, cpu_online_map);
+ if (cpus_empty(tmp))
+ return;
+
+ if (assign_irq_vector(irq, mask))
+ return;
+
+ cpus_and(tmp, cfg->domain, mask);
+ dest = cpu_mask_to_apicid(tmp);
+
+ read_msi_msg(irq, &msg);
+
+ msg.data &= ~MSI_DATA_VECTOR_MASK;
+ msg.data |= MSI_DATA_VECTOR(cfg->vector);
+ msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
+ msg.address_lo |= MSI_ADDR_DEST_ID(dest);
+
+ write_msi_msg(irq, &msg);
+ irq_desc[irq].affinity = mask;
+}
+#endif /* CONFIG_SMP */
+
+/*
+ * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
+ * which implement the MSI or MSI-X Capability Structure.
+ */
+static struct irq_chip msi_chip = {
+ .name = "PCI-MSI",
+ .unmask = unmask_msi_irq,
+ .mask = mask_msi_irq,
+ .ack = ack_apic_edge,
+#ifdef CONFIG_SMP
+ .set_affinity = set_msi_irq_affinity,
+#endif
+ .retrigger = ioapic_retrigger_irq,
+};
+
+int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
+{
+ struct msi_msg msg;
+ int irq, ret;
+ irq = create_irq();
+ if (irq < 0)
+ return irq;
+
+ ret = msi_compose_msg(dev, irq, &msg);
+ if (ret < 0) {
+ destroy_irq(irq);
+ return ret;
+ }
+
+ set_irq_msi(irq, desc);
+ write_msi_msg(irq, &msg);
+
+ set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
+
+ return 0;
+}
+
+void arch_teardown_msi_irq(unsigned int irq)
+{
+ destroy_irq(irq);
+}
+
+#endif /* CONFIG_PCI_MSI */
+
+/*
+ * Hypertransport interrupt support
+ */
+#ifdef CONFIG_HT_IRQ
+
+#ifdef CONFIG_SMP
+
+static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
+{
+ struct ht_irq_msg msg;
+ fetch_ht_irq_msg(irq, &msg);
+
+ msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
+ msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
+
+ msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
+ msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
+
+ write_ht_irq_msg(irq, &msg);
+}
+
+static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ unsigned int dest;
+ cpumask_t tmp;
+
+ cpus_and(tmp, mask, cpu_online_map);
+ if (cpus_empty(tmp))
+ return;
+
+ if (assign_irq_vector(irq, mask))
+ return;
+
+ cpus_and(tmp, cfg->domain, mask);
+ dest = cpu_mask_to_apicid(tmp);
+
+ target_ht_irq(irq, dest, cfg->vector);
+ irq_desc[irq].affinity = mask;
+}
+#endif
+
+static struct irq_chip ht_irq_chip = {
+ .name = "PCI-HT",
+ .mask = mask_ht_irq,
+ .unmask = unmask_ht_irq,
+ .ack = ack_apic_edge,
+#ifdef CONFIG_SMP
+ .set_affinity = set_ht_irq_affinity,
+#endif
+ .retrigger = ioapic_retrigger_irq,
+};
+
+int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ int err;
+ cpumask_t tmp;
+
+ tmp = TARGET_CPUS;
+ err = assign_irq_vector(irq, tmp);
+ if (!err) {
+ struct ht_irq_msg msg;
+ unsigned dest;
+
+ cpus_and(tmp, cfg->domain, tmp);
+ dest = cpu_mask_to_apicid(tmp);
+
+ msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
+
+ msg.address_lo =
+ HT_IRQ_LOW_BASE |
+ HT_IRQ_LOW_DEST_ID(dest) |
+ HT_IRQ_LOW_VECTOR(cfg->vector) |
+ ((INT_DEST_MODE == 0) ?
+ HT_IRQ_LOW_DM_PHYSICAL :
+ HT_IRQ_LOW_DM_LOGICAL) |
+ HT_IRQ_LOW_RQEOI_EDGE |
+ ((INT_DELIVERY_MODE != dest_LowestPrio) ?
+ HT_IRQ_LOW_MT_FIXED :
+ HT_IRQ_LOW_MT_ARBITRATED) |
+ HT_IRQ_LOW_IRQ_MASKED;
+
+ write_ht_irq_msg(irq, &msg);
+
+ set_irq_chip_and_handler_name(irq, &ht_irq_chip,
+ handle_edge_irq, "edge");
+ }
+ return err;
+}
+#endif /* CONFIG_HT_IRQ */
+
+/* --------------------------------------------------------------------------
+ ACPI-based IOAPIC Configuration
+ -------------------------------------------------------------------------- */
+
+#ifdef CONFIG_ACPI
+
+#define IO_APIC_MAX_ID 0xFE
+
+int __init io_apic_get_redir_entries (int ioapic)
+{
+ union IO_APIC_reg_01 reg_01;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ reg_01.raw = io_apic_read(ioapic, 1);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ return reg_01.bits.entries;
+}
+
+
+int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
+{
+ if (!IO_APIC_IRQ(irq)) {
+ apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
+ ioapic);
+ return -EINVAL;
+ }
+
+ /*
+ * IRQs < 16 are already in the irq_2_pin[] map
+ */
+ if (irq >= 16)
+ add_pin_to_irq(irq, ioapic, pin);
+
+ setup_IO_APIC_irq(ioapic, pin, irq, triggering, polarity);
+
+ return 0;
+}
+
+#endif /* CONFIG_ACPI */
+
+
+/*
+ * This function currently is only a helper for the i386 smp boot process where
+ * we need to reprogram the ioredtbls to cater for the cpus which have come online
+ * so mask in all cases should simply be TARGET_CPUS
+ */
+#ifdef CONFIG_SMP
+void __init setup_ioapic_dest(void)
+{
+ int pin, ioapic, irq, irq_entry;
+
+ if (skip_ioapic_setup == 1)
+ return;
+
+ for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
+ for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
+ irq_entry = find_irq_entry(ioapic, pin, mp_INT);
+ if (irq_entry == -1)
+ continue;
+ irq = pin_2_irq(irq_entry, ioapic, pin);
+
+ /* setup_IO_APIC_irqs could fail to get vector for some device
+ * when you have too many devices, because at that time only boot
+ * cpu is online.
+ */
+ if (!irq_cfg[irq].vector)
+ setup_IO_APIC_irq(ioapic, pin, irq,
+ irq_trigger(irq_entry),
+ irq_polarity(irq_entry));
+ else
+ set_ioapic_affinity_irq(irq, TARGET_CPUS);
+ }
+
+ }
+}
+#endif
projects / powerpc.git / commitdiff