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Message-ID: <20081121172115.GC12370@sgi.com>
Date: Fri, 21 Nov 2008 11:21:15 -0600
From: Dimitri Sivanich <sivanich@....com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org,
hpa@...or.com, john stultz <johnstul@...ibm.com>
Subject: Re: [PATCH 2/2 v3] SGI RTC: add generic timer system interrupt
I will address your concerns with this in forthcoming patchsets.
On Thu, Nov 20, 2008 at 03:12:08PM -0800, Andrew Morton wrote:
> On Wed, 19 Nov 2008 15:26:31 -0600
> Dimitri Sivanich <sivanich@....com> wrote:
>
> > This patch allocates a system interrupt vector for platform specific use
> > in implementing timer interrupts.
> >
> > Signed-off-by: Dimitri Sivanich <sivanich@....com>
> >
> > ---
> >
> > Refreshing this to use 0xed as the vector. Have repackaged it to be more
> > generic.
> >
> > arch/x86/include/asm/hw_irq.h | 1
> > arch/x86/include/asm/irq.h | 2 +
> > arch/x86/include/asm/irq_vectors.h | 5 +++
> > arch/x86/kernel/entry_64.S | 4 ++
> > arch/x86/kernel/irqinit_64.c | 45 +++++++++++++++++++++++++++++++++
> > 5 files changed, 57 insertions(+)
> >
> > Index: linux/arch/x86/kernel/entry_64.S
> > ===================================================================
> > --- linux.orig/arch/x86/kernel/entry_64.S 2008-11-19 14:59:15.000000000 -0600
> > +++ linux/arch/x86/kernel/entry_64.S 2008-11-19 15:02:16.000000000 -0600
> > @@ -865,6 +865,10 @@ ENTRY(apic_timer_interrupt)
> > apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt
> > END(apic_timer_interrupt)
> >
> > +ENTRY(generic_timer_interrupt)
> > + apicinterrupt GENERIC_TIMER_VECTOR,smp_generic_timer_interrupt
> > +END(generic_timer_interrupt)
> > +
> > ENTRY(uv_bau_message_intr1)
> > apicinterrupt 220,uv_bau_message_interrupt
> > END(uv_bau_message_intr1)
> > Index: linux/arch/x86/kernel/irqinit_64.c
> > ===================================================================
> > --- linux.orig/arch/x86/kernel/irqinit_64.c 2008-11-19 14:59:15.000000000 -0600
> > +++ linux/arch/x86/kernel/irqinit_64.c 2008-11-19 15:09:36.000000000 -0600
> > @@ -23,6 +23,7 @@
> > #include <asm/desc.h>
> > #include <asm/apic.h>
> > #include <asm/i8259.h>
> > +#include <asm/idle.h>
> >
> > /*
> > * Common place to define all x86 IRQ vectors
> > @@ -161,6 +162,47 @@ void __init init_ISA_irqs(void)
> >
> > void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
> >
> > +
> > +/* Function pointer for generic timer interrupt handling */
> > +static void (*generic_timer_interrupt_extension)(void);
> > +
> > +int
> > +generic_timer_reg_extension(void (*fn)(void))
> > +{
> > + if (generic_timer_interrupt_extension)
> > + return 1;
> > +
> > + generic_timer_interrupt_extension = fn;
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(generic_timer_reg_extension);
>
> ah-hah, there it is! These patches are in the wrong order, no?
>
>
> > +void
> > +generic_timer_unreg_extension(void)
> > +{
> > + if (generic_timer_interrupt_extension)
> > + generic_timer_interrupt_extension = NULL;
> > +}
> > +EXPORT_SYMBOL_GPL(generic_timer_unreg_extension);
> > +
> > +void smp_generic_timer_interrupt(struct pt_regs *regs)
> > +{
> > + struct pt_regs *old_regs = set_irq_regs(regs);
> > +
> > + ack_APIC_irq();
> > +
> > + exit_idle();
> > +
> > + irq_enter();
> > +
> > + if (generic_timer_interrupt_extension)
> > + generic_timer_interrupt_extension();
> > +
> > + irq_exit();
> > +
> > + set_irq_regs(old_regs);
> > +}
>
> OK, I guess that answers my earlier question.
>
> These function names are awful. I thought that
> "generic_timer_reg_extension" had something to to with hardware
> registers in the timer. I see now that you abbreviated "register" to
> "reg".
>
> Please rename these to
>
> register_generic_timer_extension()
> unregister_generic_timer_extension()
>
>
>
> > > static void __init smp_intr_init(void)
> > {
> > #ifdef CONFIG_SMP
> > @@ -202,6 +244,9 @@ static void __init apic_intr_init(void)
> > /* self generated IPI for local APIC timer */
> > alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
> >
> > + /* IPI for platform specific timers */
> > + alloc_intr_gate(GENERIC_TIMER_VECTOR, generic_timer_interrupt);
> > +
> > /* IPI vectors for APIC spurious and error interrupts */
> > alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
> > alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
> > Index: linux/arch/x86/include/asm/irq_vectors.h
> > ===================================================================
> > --- linux.orig/arch/x86/include/asm/irq_vectors.h 2008-11-19 14:59:15.000000000 -0600
> > +++ linux/arch/x86/include/asm/irq_vectors.h 2008-11-19 15:02:16.000000000 -0600
> > @@ -92,6 +92,11 @@
> > #define LOCAL_PERFMON_VECTOR 0xee
> >
> > /*
> > + * Generic timer vector for platform specific use
> > + */
> > +#define GENERIC_TIMER_VECTOR 0xed
> > +
> > +/*
> > * First APIC vector available to drivers: (vectors 0x30-0xee) we
> > * start at 0x31(0x41) to spread out vectors evenly between priority
> > * levels. (0x80 is the syscall vector)
> > Index: linux/arch/x86/include/asm/hw_irq.h
> > ===================================================================
> > --- linux.orig/arch/x86/include/asm/hw_irq.h 2008-11-19 14:59:15.000000000 -0600
> > +++ linux/arch/x86/include/asm/hw_irq.h 2008-11-19 15:02:16.000000000 -0600
> > @@ -29,6 +29,7 @@
> >
> > /* Interrupt handlers registered during init_IRQ */
> > extern void apic_timer_interrupt(void);
> > +extern void generic_timer_interrupt(void);
> > extern void error_interrupt(void);
> > extern void spurious_interrupt(void);
> > extern void thermal_interrupt(void);
> > Index: linux/arch/x86/include/asm/irq.h
> > ===================================================================
> > --- linux.orig/arch/x86/include/asm/irq.h 2008-11-19 14:59:15.000000000 -0600
> > +++ linux/arch/x86/include/asm/irq.h 2008-11-19 15:02:16.000000000 -0600
> > @@ -38,6 +38,8 @@ extern void fixup_irqs(cpumask_t map);
> >
> > extern unsigned int do_IRQ(struct pt_regs *regs);
> > extern void init_IRQ(void);
> > +extern int generic_timer_reg_extension(void (*fn)(void));
> > +extern void generic_timer_unreg_extension(void);
> > extern void native_init_IRQ(void);
> >
> > /* Interrupt vector management */
--
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