linux/include/asm-ia64/irq.h
Ashok Raj 54d5d42404 [PATCH] x86/x86_64: deferred handling of writes to /proc/irqxx/smp_affinity
When handling writes to /proc/irq, current code is re-programming rte
entries directly. This is not recommended and could potentially cause
chipset's to lockup, or cause missing interrupts.

CONFIG_IRQ_BALANCE does this correctly, where it re-programs only when the
interrupt is pending. The same needs to be done for /proc/irq handling as well.
Otherwise user space irq balancers are really not doing the right thing.

- Changed pending_irq_balance_cpumask to pending_irq_migrate_cpumask for
  lack of a generic name.
- added move_irq out of IRQ_BALANCE, and added this same to X86_64
- Added new proc handler for write, so we can do deferred write at irq
  handling time.
- Display of /proc/irq/XX/smp_affinity used to display CPU_MASKALL, instead
  it now shows only active cpu masks, or exactly what was set.
- Provided a common move_irq implementation, instead of duplicating
  when using generic irq framework.

Tested on i386/x86_64 and ia64 with CONFIG_PCI_MSI turned on and off.
Tested UP builds as well.

MSI testing: tbd: I have cards, need to look for a x-over cable, although I
did test an earlier version of this patch.  Will test in a couple days.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Acked-by: Zwane Mwaikambo <zwane@holomorphy.com>
Grudgingly-acked-by: Andi Kleen <ak@muc.de>
Signed-off-by: Coywolf Qi Hunt <coywolf@lovecn.org>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:57:15 -07:00

38 lines
1.0 KiB
C

#ifndef _ASM_IA64_IRQ_H
#define _ASM_IA64_IRQ_H
/*
* Copyright (C) 1999-2000, 2002 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
* Stephane Eranian <eranian@hpl.hp.com>
*
* 11/24/98 S.Eranian updated TIMER_IRQ and irq_canonicalize
* 01/20/99 S.Eranian added keyboard interrupt
* 02/29/00 D.Mosberger moved most things into hw_irq.h
*/
#define NR_IRQS 256
#define NR_IRQ_VECTORS NR_IRQS
static __inline__ int
irq_canonicalize (int irq)
{
/*
* We do the legacy thing here of pretending that irqs < 16
* are 8259 irqs. This really shouldn't be necessary at all,
* but we keep it here as serial.c still uses it...
*/
return ((irq == 2) ? 9 : irq);
}
extern void disable_irq (unsigned int);
extern void disable_irq_nosync (unsigned int);
extern void enable_irq (unsigned int);
extern void set_irq_affinity_info (unsigned int irq, int dest, int redir);
struct irqaction;
struct pt_regs;
int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
#endif /* _ASM_IA64_IRQ_H */