linux-kernel - Re: [PATCH] PCI: boot parameter to avoid expansion ROM memory allocation

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Message-ID: <86802c440805131048r2f027809pe972a5e27321c2b0@mail.gmail.com>
Date:	Tue, 13 May 2008 10:48:03 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Gary Hade" <garyhade@...ibm.com>
Cc:	jbarnes@...tuousgeek.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI: boot parameter to avoid expansion ROM memory allocation

On Mon, May 12, 2008 at 3:30 PM, Gary Hade <garyhade@...ibm.com> wrote:
> On Mon, May 12, 2008 at 02:43:44PM -0700, Yinghai Lu wrote:
>  > On Mon, May 12, 2008 at 1:57 PM, Gary Hade <garyhade@...ibm.com> wrote:
>         <snip>
>
> > >  --- linux-2.6.26-rc2/arch/x86/pci/common.c.orig 2008-05-12 10:59:58.000000000 -0700
>  > >  +++ linux-2.6.26-rc2/arch/x86/pci/common.c      2008-05-12 11:22:05.000000000 -0700
>  > >  @@ -121,6 +121,21 @@ void __init dmi_check_skip_isa_align(voi
>  > >         dmi_check_system(can_skip_pciprobe_dmi_table);
>  > >   }
>  > >
>  > >  +static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
>  > >  +{
>  > >  +       struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
>  > >  +
>  > >  +       if (pci_probe & PCI_NOASSIGN_ROMS) {
>  > >  +               if (rom_r->parent)
>  > >  +                       return;
>  > >  +               if (rom_r->start) {
>  > >  +                       /* we deal with BIOS assigned ROM later */
>  > >  +                       return;
>  > >  +               }
>  > >  +               rom_r->start = rom_r->end = rom_r->flags = 0;
>  > >  +       }
>  > >  +}
>  > >  +
>  > >   /*
>  > >   *  Called after each bus is probed, but before its children
>  > >   *  are examined.
>  > >  @@ -128,7 +143,11 @@ void __init dmi_check_skip_isa_align(voi
>  > >
>  > >   void __devinit  pcibios_fixup_bus(struct pci_bus *b)
>  > >   {
>  > >  +       struct pci_dev *dev;
>  > >  +
>  > >         pci_read_bridge_bases(b);
>  > >  +       list_for_each_entry(dev, &b->devices, bus_list)
>  > >  +               pcibios_fixup_device_resources(dev);
>  > >   }
>  >
>  > or put check
>  > +       if (pci_probe & PCI_NOASSIGN_ROMS) {
>  >
>  > out of loop?
>
>  I could certainly do that but I had intended that the new
>  pcibios_fixup_device_resources function act as a container where
>  other kinds of fixups could be added later.  Do you (or others)
>  think the additional cycles consumed by this approach are an
>  issue here?

ok, then wonder if we can don't assign roms for x86_64 by default.

can we use pci rom in 64 bit kernel?

YH
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