linux-kernel - Re: [PATCH] x86/mrst: move sfi timer irqs after gsi

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Date:	Thu, 7 Apr 2011 09:30:21 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	<jacob.jun.pan@...ux.intel.com>, <linux-kernel@...r.kernel.org>,
	<hpa@...or.com>, <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, <arjan@...ux.intel.com>,
	<alan@...ux.intel.com>
Subject: Re: [PATCH] x86/mrst: move sfi timer irqs after gsi_top

Hi Jacob,

The mrst vrtc driver has the similar irq number problem in 2.6.39-rc2,
how about the following patch to solve it in ioapic code.

Also I saw NR_IRQS_LEGACY are used in several other places of io_apic code,
it may has some potential issue for mrst which I'm not sure.

Thanks,
Feng
---------------------

>From 9bfe95ca6b1737a0418c6403f9684da9fb844cbf Mon Sep 17 00:00:00 2001
From: Feng Tang <feng.tang@...el.com>
Date: Thu, 7 Apr 2011 09:08:00 +0800
Subject: [PATCH] x86: ioapic: use legacy_pic->nr_legacy_irqs instead of NR_IRQS_LEGACY for pin_2_irq()

legacy_pic->nr_legacy_irqs has the correct number of legacy irqs for
a x86 platform (legacy PC, Moorestown etc).

Signed-off-by: Feng Tang <feng.tang@...el.com>
---
 arch/x86/kernel/apic/io_apic.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 68df09b..2dcad66 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -954,7 +954,7 @@ static int pin_2_irq(int idx, int apic, int pin)
 	} else {
 		u32 gsi = mp_gsi_routing[apic].gsi_base + pin;
 
-		if (gsi >= NR_IRQS_LEGACY)
+		if (gsi >= legacy_pic->nr_legacy_irqs)
 			irq = gsi;
 		else
 			irq = gsi_top + gsi;
-- 
1.7.0.4

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Date: 2011/4/5
> Subject: [PATCH] x86/mrst: move sfi timer irqs after gsi_top
> To: LKML <linux-kernel@...r.kernel.org>, "H. Peter Anvin"
> <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>, Thomas Gleixner
> <tglx@...utronix.de>, Arjan van de Ven <arjan@...ux.intel.com>, Alan
> Cox <alan@...ux.intel.com>
> 抄送： Jacob Pan <jacob.jun.pan@...ux.intel.com>
> 
> 
> Moorestown borrows mp_irqs for its early SFI device IRQs, it used
> to be 1:1 mapped between irq # and ioapic pin#. After gsi_top is
> introduced, we have to allocate irqs on top of gsi_top since below
> that irqs are not set to ioapic chip whereas Moorestown SFI device
> irqs are all routed via ioapic chip.
> 
> Without this fix, Moorestown fails to boot at secondary clock setup
> since it cannot do request_irq on cpu 1 timer which does not have a
> valid irq_chip.
> 
> Also use correct MP configuration table entry type INTSRC, which is
> used for IO interrupt assignment.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  arch/x86/kernel/apb_timer.c   |    2 +-
>  arch/x86/platform/mrst/mrst.c |    4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/kernel/apb_timer.c b/arch/x86/kernel/apb_timer.c
> index cd1ffed..f9f82cb 100644
> --- a/arch/x86/kernel/apb_timer.c
> +++ b/arch/x86/kernel/apb_timer.c
> @@ -630,7 +630,7 @@ void __init apbt_time_init(void)
>                p_mtmr = sfi_get_mtmr(i);
>                if (p_mtmr) {
>                        adev->tick = p_mtmr->freq_hz;
> -                       adev->irq = p_mtmr->irq;
> +                       adev->irq = p_mtmr->irq + gsi_top;
>                } else
>                        printk(KERN_ERR "Failed to get timer for cpu
> %d\n", i); adev->count = 0;
> diff --git a/arch/x86/platform/mrst/mrst.c
> b/arch/x86/platform/mrst/mrst.c index 5c0207b..448c20d 100644
> --- a/arch/x86/platform/mrst/mrst.c
> +++ b/arch/x86/platform/mrst/mrst.c
> @@ -97,12 +97,12 @@ static int __init sfi_parse_mtmr(struct
> sfi_table_header *table)
>                        pentry->freq_hz, pentry->irq);
>                        if (!pentry->irq)
>                                continue;
> -                       mp_irq.type = MP_IOAPIC;
> +                       mp_irq.type = MP_INTSRC;
>                        mp_irq.irqtype = mp_INT;
>  /* triggering mode edge bit 2-3, active high polarity bit 0-1 */
>                        mp_irq.irqflag = 5;
>                        mp_irq.srcbus = 0;
> -                       mp_irq.srcbusirq = pentry->irq; /* IRQ */
> +                       mp_irq.srcbusirq = pentry->irq + gsi_top; /*
> IRQ */ mp_irq.dstapic = MP_APIC_ALL;
>                        mp_irq.dstirq = pentry->irq;
>                        mp_save_irq(&mp_irq);
> --
> 1.7.1
> 
> --
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