linux-kernel - Re: [PATCH] x86/pci: do assign root bus res if

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Message-ID: <86802c440905201710q297ac1ecj4279a780811843b1@mail.gmail.com>
Date:	Wed, 20 May 2009 17:10:01 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Bjorn Helgaas <bjorn.helgaas@...com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, Gary Hade <garyhade@...ibm.com>,
	Alex Chiang <achiang@...com>, linux-acpi@...r.kernel.org,
	Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH] x86/pci: do assign root bus res if _CRS is used

On Wed, May 20, 2009 at 4:49 PM, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> On Fri, 8 May 2009 16:40:10 -0600
> Bjorn Helgaas <bjorn.helgaas@...com> wrote:
>> Did anything happen with this?
>>
>> The longer we wait to make "use_crs" the default, the harder it
>> will be, so I'd like to push ahead.
>
> Here's a patch to make CRS the default.  If it looks ok I can push it
> into my linux-next branch.  I'm all for using reliable data from the
> BIOS.  I guess we'll find out fairly quickly if this stuff isn't...
>
> --
> Jesse Barnes, Intel Open Source Technology Center
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 90b3924..8d798bf 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1777,7 +1777,7 @@ and is between 256 and 4096 characters. It is defined in the file
>                                IRQ routing is enabled.
>                noacpi          [X86] Do not use ACPI for IRQ routing
>                                or for PCI scanning.
> -               use_crs         [X86] Use _CRS for PCI resource
> +               nocrs           [X86] Don't use _CRS for PCI resource
>                                allocation.
>                routeirq        Do IRQ routing for all PCI devices.
>                                This is normally done in pci_enable_device(),
> diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
> index e60fd3e..010c08c 100644
> --- a/arch/x86/include/asm/pci_x86.h
> +++ b/arch/x86/include/asm/pci_x86.h
> @@ -25,7 +25,7 @@
>  #define PCI_BIOS_IRQ_SCAN      0x2000
>  #define PCI_ASSIGN_ALL_BUSSES  0x4000
>  #define PCI_CAN_SKIP_ISA_ALIGN 0x8000
> -#define PCI_USE__CRS           0x10000
> +#define PCI_NO_CRS             0x10000

PCI_NO_ROOT_CRS is more accurate ?

YH
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