linux-kernel - Re: [PATCH] x86, UV: add uv_setup_irq() and uv_teardown

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Message-ID: <86802c440810020919p4391cbebva0eaa5591e7915be@mail.gmail.com>
Date:	Thu, 2 Oct 2008 09:19:04 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"Dean Nelson" <dcn@....com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Alan Mayer" <ajm@....com>, jeremy@...p.org, rusty@...tcorp.com.au,
	suresh.b.siddha@...el.com, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Yinghai Lu" <Yinghai.lu@....com>
Subject: Re: [PATCH] x86, UV: add uv_setup_irq() and uv_teardown_irq() functions

On Wed, Oct 1, 2008 at 4:44 AM, Dean Nelson <dcn@....com> wrote:
> Provide a means for UV interrupt MMRs to be setup with the message to be sent
> when an MSI is raised.
>
> Signed-off-by: Dean Nelson <dcn@....com>
>
> ---
>
> This functionality is needed by drivers/misc/sgi-xp. And a patch will be
> submitted shortly.
>
>  arch/x86/kernel/Makefile    |    2
>  arch/x86/kernel/io_apic.c   |   95 ++++++++++++++++++++++++++++++++++++++++
>  arch/x86/kernel/uv_irq.c    |   50 +++++++++++++++++++++
>  include/asm-x86/uv/uv_irq.h |   34 ++++++++++++++
>  kernel/irq/chip.c           |    1
>  5 files changed, 181 insertions(+), 1 deletion(-)
>
> Index: linux/arch/x86/kernel/io_apic.c
> ===================================================================
> --- linux.orig/arch/x86/kernel/io_apic.c        2008-09-30 09:07:42.000000000 -0500
> +++ linux/arch/x86/kernel/io_apic.c     2008-09-30 12:54:12.000000000 -0500
> @@ -58,6 +58,8 @@
>  #include <asm/setup.h>
>  #include <asm/irq_remapping.h>
>  #include <asm/hpet.h>
> +#include <asm/uv/uv_hub.h>
> +#include <asm/uv/uv_irq.h>
>
>  #include <mach_ipi.h>
>  #include <mach_apic.h>
> @@ -3694,6 +3696,99 @@ int arch_setup_ht_irq(unsigned int irq,
>  }
>  #endif /* CONFIG_HT_IRQ */
>
> +#ifdef CONFIG_X86_64
> +static void noop(unsigned int irq)
> +{
> +}
> +
> +static unsigned int noop_ret(unsigned int irq)
> +{
> +       return 0;
> +}
> +
> +static void ack_apic(unsigned int irq)
> +{
> +       ack_APIC_irq();
> +}
> +
> +static struct irq_chip uv_irq_chip = {
> +       .name           = "UV_MSI",

anything to do with MSI?

YH
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