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    SubjectRe: [PATCH] PCI: boot parameter to avoid expansion ROM memory allocation
    On Mon, May 12, 2008 at 3:30 PM, Gary Hade <garyhade@us.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@us.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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