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![Thomas Gleixner](/assets/img/avatar_default.png)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2202 lines
54 KiB
C
2202 lines
54 KiB
C
/*
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* Intel IO-APIC support for multi-Pentium hosts.
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*
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* Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
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*
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* Many thanks to Stig Venaas for trying out countless experimental
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* patches and reporting/debugging problems patiently!
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*
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* (c) 1999, Multiple IO-APIC support, developed by
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* Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
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* Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
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* further tested and cleaned up by Zach Brown <zab@redhat.com>
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* and Ingo Molnar <mingo@redhat.com>
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*
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* Fixes
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* Maciej W. Rozycki : Bits for genuine 82489DX APICs;
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* thanks to Eric Gilmore
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* and Rolf G. Tews
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* for testing these extensively
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* Paul Diefenbaugh : Added full ACPI support
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*/
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/mc146818rtc.h>
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#include <linux/acpi.h>
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#include <linux/sysdev.h>
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#include <linux/msi.h>
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#include <linux/htirq.h>
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#ifdef CONFIG_ACPI
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#include <acpi/acpi_bus.h>
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#endif
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#include <asm/idle.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <asm/desc.h>
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#include <asm/proto.h>
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#include <asm/mach_apic.h>
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#include <asm/acpi.h>
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#include <asm/dma.h>
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#include <asm/nmi.h>
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#include <asm/msidef.h>
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#include <asm/hypertransport.h>
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struct irq_cfg {
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cpumask_t domain;
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cpumask_t old_domain;
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unsigned move_cleanup_count;
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u8 vector;
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u8 move_in_progress : 1;
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};
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/* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
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struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
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[0] = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
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[1] = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
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[2] = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
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[3] = { .domain = CPU_MASK_ALL, .vector = IRQ3_VECTOR, },
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[4] = { .domain = CPU_MASK_ALL, .vector = IRQ4_VECTOR, },
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[5] = { .domain = CPU_MASK_ALL, .vector = IRQ5_VECTOR, },
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[6] = { .domain = CPU_MASK_ALL, .vector = IRQ6_VECTOR, },
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[7] = { .domain = CPU_MASK_ALL, .vector = IRQ7_VECTOR, },
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[8] = { .domain = CPU_MASK_ALL, .vector = IRQ8_VECTOR, },
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[9] = { .domain = CPU_MASK_ALL, .vector = IRQ9_VECTOR, },
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[10] = { .domain = CPU_MASK_ALL, .vector = IRQ10_VECTOR, },
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[11] = { .domain = CPU_MASK_ALL, .vector = IRQ11_VECTOR, },
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[12] = { .domain = CPU_MASK_ALL, .vector = IRQ12_VECTOR, },
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[13] = { .domain = CPU_MASK_ALL, .vector = IRQ13_VECTOR, },
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[14] = { .domain = CPU_MASK_ALL, .vector = IRQ14_VECTOR, },
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[15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
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};
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static int assign_irq_vector(int irq, cpumask_t mask);
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#define __apicdebuginit __init
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int sis_apic_bug; /* not actually supported, dummy for compile */
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static int no_timer_check;
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static int disable_timer_pin_1 __initdata;
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int timer_over_8254 __initdata = 1;
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/* Where if anywhere is the i8259 connect in external int mode */
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static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
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static DEFINE_SPINLOCK(ioapic_lock);
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DEFINE_SPINLOCK(vector_lock);
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/*
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* # of IRQ routing registers
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*/
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int nr_ioapic_registers[MAX_IO_APICS];
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/*
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* Rough estimation of how many shared IRQs there are, can
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* be changed anytime.
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*/
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#define MAX_PLUS_SHARED_IRQS NR_IRQS
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#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
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/*
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* This is performance-critical, we want to do it O(1)
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*
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* the indexing order of this array favors 1:1 mappings
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* between pins and IRQs.
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*/
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static struct irq_pin_list {
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short apic, pin, next;
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} irq_2_pin[PIN_MAP_SIZE];
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struct io_apic {
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unsigned int index;
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unsigned int unused[3];
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unsigned int data;
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};
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static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
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{
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return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
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+ (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
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}
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static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(reg, &io_apic->index);
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return readl(&io_apic->data);
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}
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static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(reg, &io_apic->index);
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writel(value, &io_apic->data);
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}
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/*
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* Re-write a value: to be used for read-modify-write
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* cycles where the read already set up the index register.
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*/
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static inline void io_apic_modify(unsigned int apic, unsigned int value)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(value, &io_apic->data);
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}
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static int io_apic_level_ack_pending(unsigned int irq)
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{
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struct irq_pin_list *entry;
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unsigned long flags;
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int pending = 0;
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spin_lock_irqsave(&ioapic_lock, flags);
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entry = irq_2_pin + irq;
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for (;;) {
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unsigned int reg;
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int pin;
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pin = entry->pin;
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if (pin == -1)
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break;
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reg = io_apic_read(entry->apic, 0x10 + pin*2);
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/* Is the remote IRR bit set? */
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pending |= (reg >> 14) & 1;
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if (!entry->next)
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break;
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entry = irq_2_pin + entry->next;
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}
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spin_unlock_irqrestore(&ioapic_lock, flags);
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return pending;
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}
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/*
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* Synchronize the IO-APIC and the CPU by doing
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* a dummy read from the IO-APIC
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*/
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static inline void io_apic_sync(unsigned int apic)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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readl(&io_apic->data);
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}
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#define __DO_ACTION(R, ACTION, FINAL) \
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\
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{ \
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int pin; \
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struct irq_pin_list *entry = irq_2_pin + irq; \
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\
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BUG_ON(irq >= NR_IRQS); \
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for (;;) { \
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unsigned int reg; \
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pin = entry->pin; \
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if (pin == -1) \
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break; \
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reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
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reg ACTION; \
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io_apic_modify(entry->apic, reg); \
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FINAL; \
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if (!entry->next) \
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break; \
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entry = irq_2_pin + entry->next; \
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} \
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}
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union entry_union {
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struct { u32 w1, w2; };
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struct IO_APIC_route_entry entry;
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};
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static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
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{
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union entry_union eu;
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unsigned long flags;
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spin_lock_irqsave(&ioapic_lock, flags);
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eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
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eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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return eu.entry;
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}
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/*
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* When we write a new IO APIC routing entry, we need to write the high
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* word first! If the mask bit in the low word is clear, we will enable
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* the interrupt, and we need to make sure the entry is fully populated
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* before that happens.
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*/
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static void
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__ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
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{
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union entry_union eu;
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eu.entry = e;
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io_apic_write(apic, 0x11 + 2*pin, eu.w2);
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io_apic_write(apic, 0x10 + 2*pin, eu.w1);
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}
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static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
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{
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unsigned long flags;
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spin_lock_irqsave(&ioapic_lock, flags);
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__ioapic_write_entry(apic, pin, e);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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/*
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* When we mask an IO APIC routing entry, we need to write the low
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* word first, in order to set the mask bit before we change the
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* high bits!
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*/
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static void ioapic_mask_entry(int apic, int pin)
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{
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unsigned long flags;
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union entry_union eu = { .entry.mask = 1 };
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spin_lock_irqsave(&ioapic_lock, flags);
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io_apic_write(apic, 0x10 + 2*pin, eu.w1);
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io_apic_write(apic, 0x11 + 2*pin, eu.w2);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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#ifdef CONFIG_SMP
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static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
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{
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int apic, pin;
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struct irq_pin_list *entry = irq_2_pin + irq;
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BUG_ON(irq >= NR_IRQS);
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for (;;) {
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unsigned int reg;
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apic = entry->apic;
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pin = entry->pin;
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if (pin == -1)
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break;
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io_apic_write(apic, 0x11 + pin*2, dest);
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reg = io_apic_read(apic, 0x10 + pin*2);
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reg &= ~0x000000ff;
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reg |= vector;
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io_apic_modify(apic, reg);
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if (!entry->next)
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break;
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entry = irq_2_pin + entry->next;
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}
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}
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static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
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{
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struct irq_cfg *cfg = irq_cfg + irq;
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unsigned long flags;
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unsigned int dest;
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cpumask_t tmp;
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cpus_and(tmp, mask, cpu_online_map);
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if (cpus_empty(tmp))
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return;
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if (assign_irq_vector(irq, mask))
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return;
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cpus_and(tmp, cfg->domain, mask);
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dest = cpu_mask_to_apicid(tmp);
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/*
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* Only the high 8 bits are valid.
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*/
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dest = SET_APIC_LOGICAL_ID(dest);
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spin_lock_irqsave(&ioapic_lock, flags);
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__target_IO_APIC_irq(irq, dest, cfg->vector);
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irq_desc[irq].affinity = mask;
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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#endif
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/*
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* The common case is 1:1 IRQ<->pin mappings. Sometimes there are
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* shared ISA-space IRQs, so we have to support them. We are super
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* fast in the common case, and fast for shared ISA-space IRQs.
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*/
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static void add_pin_to_irq(unsigned int irq, int apic, int pin)
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{
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static int first_free_entry = NR_IRQS;
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struct irq_pin_list *entry = irq_2_pin + irq;
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BUG_ON(irq >= NR_IRQS);
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while (entry->next)
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entry = irq_2_pin + entry->next;
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if (entry->pin != -1) {
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entry->next = first_free_entry;
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entry = irq_2_pin + entry->next;
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if (++first_free_entry >= PIN_MAP_SIZE)
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panic("io_apic.c: ran out of irq_2_pin entries!");
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}
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entry->apic = apic;
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entry->pin = pin;
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}
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#define DO_ACTION(name,R,ACTION, FINAL) \
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\
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static void name##_IO_APIC_irq (unsigned int irq) \
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__DO_ACTION(R, ACTION, FINAL)
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DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) )
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/* mask = 1 */
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DO_ACTION( __unmask, 0, &= 0xfffeffff, )
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/* mask = 0 */
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static void mask_IO_APIC_irq (unsigned int irq)
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{
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unsigned long flags;
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spin_lock_irqsave(&ioapic_lock, flags);
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__mask_IO_APIC_irq(irq);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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static void unmask_IO_APIC_irq (unsigned int irq)
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{
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unsigned long flags;
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spin_lock_irqsave(&ioapic_lock, flags);
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__unmask_IO_APIC_irq(irq);
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spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
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{
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struct IO_APIC_route_entry entry;
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/* Check delivery_mode to be sure we're not clearing an SMI pin */
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entry = ioapic_read_entry(apic, pin);
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if (entry.delivery_mode == dest_SMI)
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return;
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/*
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* Disable it in the IO-APIC irq-routing table:
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*/
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ioapic_mask_entry(apic, pin);
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}
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static void clear_IO_APIC (void)
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{
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int apic, pin;
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for (apic = 0; apic < nr_ioapics; apic++)
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for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
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clear_IO_APIC_pin(apic, pin);
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}
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int skip_ioapic_setup;
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int ioapic_force;
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static int __init parse_noapic(char *str)
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{
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disable_ioapic_setup();
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return 0;
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}
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early_param("noapic", parse_noapic);
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/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
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static int __init disable_timer_pin_setup(char *arg)
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{
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disable_timer_pin_1 = 1;
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return 1;
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}
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__setup("disable_timer_pin_1", disable_timer_pin_setup);
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static int __init setup_disable_8254_timer(char *s)
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{
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timer_over_8254 = -1;
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return 1;
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}
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static int __init setup_enable_8254_timer(char *s)
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{
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timer_over_8254 = 2;
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return 1;
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}
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__setup("disable_8254_timer", setup_disable_8254_timer);
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__setup("enable_8254_timer", setup_enable_8254_timer);
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/*
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* Find the IRQ entry number of a certain pin.
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*/
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static int find_irq_entry(int apic, int pin, int type)
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{
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int i;
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for (i = 0; i < mp_irq_entries; i++)
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if (mp_irqs[i].mpc_irqtype == type &&
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(mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
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mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
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mp_irqs[i].mpc_dstirq == pin)
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return i;
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return -1;
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}
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/*
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* Find the pin to which IRQ[irq] (ISA) is connected
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*/
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static int __init find_isa_irq_pin(int irq, int type)
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{
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int i;
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for (i = 0; i < mp_irq_entries; i++) {
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int lbus = mp_irqs[i].mpc_srcbus;
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if (test_bit(lbus, mp_bus_not_pci) &&
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(mp_irqs[i].mpc_irqtype == type) &&
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(mp_irqs[i].mpc_srcbusirq == irq))
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return mp_irqs[i].mpc_dstirq;
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}
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return -1;
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}
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static int __init find_isa_irq_apic(int irq, int type)
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{
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int i;
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for (i = 0; i < mp_irq_entries; i++) {
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int lbus = mp_irqs[i].mpc_srcbus;
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if (test_bit(lbus, mp_bus_not_pci) &&
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(mp_irqs[i].mpc_irqtype == type) &&
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(mp_irqs[i].mpc_srcbusirq == irq))
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break;
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}
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if (i < mp_irq_entries) {
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int apic;
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for(apic = 0; apic < nr_ioapics; apic++) {
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if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
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return apic;
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}
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}
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return -1;
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}
|
|
|
|
/*
|
|
* 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
|