2008-10-22 23:26:29 -06:00
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#ifndef _ASM_X86_HW_IRQ_H
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#define _ASM_X86_HW_IRQ_H
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2008-05-02 11:00:30 -06:00
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/*
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* (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
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*
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* moved some of the old arch/i386/kernel/irq.h to here. VY
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*
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* IRQ/IPI changes taken from work by Thomas Radke
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* <tomsoft@informatik.tu-chemnitz.de>
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*
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* hacked by Andi Kleen for x86-64.
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* unified by tglx
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*/
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2008-05-02 12:10:09 -06:00
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#include <asm/irq_vectors.h>
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2008-05-02 11:00:30 -06:00
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#ifndef __ASSEMBLY__
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#include <linux/percpu.h>
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#include <linux/profile.h>
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#include <linux/smp.h>
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#include <asm/atomic.h>
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#include <asm/irq.h>
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#include <asm/sections.h>
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/* Interrupt handlers registered during init_IRQ */
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extern void apic_timer_interrupt(void);
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2009-03-04 11:56:05 -07:00
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extern void generic_interrupt(void);
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2008-05-02 11:00:30 -06:00
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extern void error_interrupt(void);
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2009-04-06 03:45:03 -06:00
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extern void perf_pending_interrupt(void);
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2008-12-03 02:39:53 -07:00
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2008-05-02 11:00:30 -06:00
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extern void spurious_interrupt(void);
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extern void thermal_interrupt(void);
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extern void reschedule_interrupt(void);
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2009-05-27 13:56:54 -06:00
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extern void mce_self_interrupt(void);
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2008-05-02 11:00:30 -06:00
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extern void invalidate_interrupt(void);
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extern void invalidate_interrupt0(void);
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extern void invalidate_interrupt1(void);
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extern void invalidate_interrupt2(void);
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extern void invalidate_interrupt3(void);
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extern void invalidate_interrupt4(void);
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extern void invalidate_interrupt5(void);
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extern void invalidate_interrupt6(void);
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extern void invalidate_interrupt7(void);
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extern void irq_move_cleanup_interrupt(void);
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x86: fix panic with interrupts off (needed for MCE)
For some time each panic() called with interrupts disabled
triggered the !irqs_disabled() WARN_ON in smp_call_function(),
producing ugly backtraces and confusing users.
This is a common situation with machine checks for example which
tend to call panic with interrupts disabled, but will also hit
in other situations e.g. panic during early boot. In fact it
means that panic cannot be called in many circumstances, which
would be bad.
This all started with the new fancy queued smp_call_function,
which is then used by the shutdown path to shut down the other
CPUs.
On closer examination it turned out that the fancy RCU
smp_call_function() does lots of things not suitable in a panic
situation anyways, like allocating memory and relying on complex
system state.
I originally tried to patch this over by checking for panic
there, but it was quite complicated and the original patch
was also not very popular. This also didn't fix some of the
underlying complexity problems.
The new code in post 2.6.29 tries to patch around this by
checking for oops_in_progress, but that is not enough to make
this fully safe and I don't think that's a real solution
because panic has to be reliable.
So instead use an own vector to reboot. This makes the reboot
code extremly straight forward, which is definitely a big plus
in a panic situation where it is important to avoid relying on
too much kernel state. The new simple code is also safe to be
called from interupts off region because it is very very simple.
There can be situations where it is important that panic
is reliable. For example on a fatal machine check the panic
is needed to get the system up again and running as quickly
as possible. So it's important that panic is reliable and
all function it calls simple.
This is why I came up with this simple vector scheme.
It's very hard to beat in simplicity. Vectors are not
particularly precious anymore since all big systems are
using per CPU vectors.
Another possibility would have been to use an NMI similar
to kdump, but there is still the problem that NMIs don't
work reliably on some systems due to BIOS issues. NMIs
would have been able to stop CPUs running with interrupts
off too. In the sake of universal reliability I opted for
using a non NMI vector for now.
I put the reboot vector into the highest priority bucket of
the APIC vectors and moved the 64bit UV_BAU message down
instead into the next lower priority.
[ Impact: bug fix, fixes an old regression ]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-05-27 13:56:52 -06:00
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extern void reboot_interrupt(void);
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2008-05-02 11:00:30 -06:00
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extern void threshold_interrupt(void);
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extern void call_function_interrupt(void);
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2008-07-15 13:55:59 -06:00
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extern void call_function_single_interrupt(void);
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2008-05-02 11:00:30 -06:00
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/* PIC specific functions */
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extern void disable_8259A_irq(unsigned int irq);
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extern void enable_8259A_irq(unsigned int irq);
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extern int i8259A_irq_pending(unsigned int irq);
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extern void make_8259A_irq(unsigned int irq);
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extern void init_8259A(int aeoi);
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/* IOAPIC */
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2009-02-08 17:18:03 -07:00
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#define IO_APIC_IRQ(x) (((x) >= NR_IRQS_LEGACY) || ((1<<(x)) & io_apic_irqs))
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2008-05-02 11:00:30 -06:00
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extern unsigned long io_apic_irqs;
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extern void init_VISWS_APIC_irqs(void);
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extern void setup_IO_APIC(void);
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extern void disable_IO_APIC(void);
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2009-05-15 14:05:16 -06:00
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struct io_apic_irq_attr {
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int ioapic;
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int ioapic_pin;
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int trigger;
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int polarity;
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};
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static inline void set_io_apic_irq_attr(struct io_apic_irq_attr *irq_attr,
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int ioapic, int ioapic_pin,
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int trigger, int polarity)
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{
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irq_attr->ioapic = ioapic;
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irq_attr->ioapic_pin = ioapic_pin;
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irq_attr->trigger = trigger;
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irq_attr->polarity = polarity;
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}
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2009-05-06 11:08:22 -06:00
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extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin,
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2009-05-15 14:05:16 -06:00
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struct io_apic_irq_attr *irq_attr);
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2008-05-02 11:00:30 -06:00
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extern void setup_ioapic_dest(void);
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2008-05-02 14:02:25 -06:00
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extern void enable_IO_APIC(void);
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2008-05-02 11:00:30 -06:00
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/* Statistics */
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extern atomic_t irq_err_count;
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extern atomic_t irq_mis_count;
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2008-05-02 16:30:50 -06:00
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/* EISA */
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extern void eisa_set_level_irq(unsigned int irq);
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2008-07-23 05:43:14 -06:00
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/* SMP */
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extern void smp_apic_timer_interrupt(struct pt_regs *);
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extern void smp_spurious_interrupt(struct pt_regs *);
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2009-04-10 12:33:10 -06:00
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extern void smp_generic_interrupt(struct pt_regs *);
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2008-07-23 05:43:14 -06:00
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extern void smp_error_interrupt(struct pt_regs *);
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2009-04-10 12:33:10 -06:00
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#ifdef CONFIG_X86_IO_APIC
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extern asmlinkage void smp_irq_move_cleanup_interrupt(void);
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#endif
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2009-01-27 09:07:08 -07:00
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#ifdef CONFIG_SMP
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2008-07-24 23:12:26 -06:00
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extern void smp_reschedule_interrupt(struct pt_regs *);
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extern void smp_call_function_interrupt(struct pt_regs *);
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extern void smp_call_function_single_interrupt(struct pt_regs *);
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2008-07-25 00:02:38 -06:00
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#ifdef CONFIG_X86_32
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extern void smp_invalidate_interrupt(struct pt_regs *);
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#else
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extern asmlinkage void smp_invalidate_interrupt(struct pt_regs *);
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#endif
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2008-07-24 23:12:26 -06:00
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#endif
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2008-07-23 05:43:14 -06:00
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2008-11-11 14:03:07 -07:00
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extern void (*__initconst interrupt[NR_VECTORS-FIRST_EXTERNAL_VECTOR])(void);
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2008-08-19 21:50:28 -06:00
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2008-05-02 14:10:39 -06:00
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typedef int vector_irq_t[NR_VECTORS];
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DECLARE_PER_CPU(vector_irq_t, vector_irq);
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2008-08-09 16:09:02 -06:00
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2008-08-19 21:50:28 -06:00
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#ifdef CONFIG_X86_IO_APIC
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2008-08-09 16:09:02 -06:00
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extern void lock_vector_lock(void);
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extern void unlock_vector_lock(void);
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extern void __setup_vector_irq(int cpu);
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#else
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static inline void lock_vector_lock(void) {}
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static inline void unlock_vector_lock(void) {}
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static inline void __setup_vector_irq(int cpu) {}
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#endif
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2008-05-02 11:00:30 -06:00
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2008-05-02 14:10:39 -06:00
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#endif /* !ASSEMBLY_ */
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2008-10-22 23:26:29 -06:00
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#endif /* _ASM_X86_HW_IRQ_H */
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