On Wed, Dec 19, 2007 at 05:17:56PM -0500, [email protected] wrote:
> commit 307e3aecde8060af3802590f8c5bffb5456fe22b
> Author: Tony Camuso <[email protected]>
> Date: Wed Dec 19 15:38:31 2007 -0500
>
> Modifies arch/x86/pci/direct.c to add the Legacy PCI Config routines
> that will be made available, even when MMCONFIG is the platform default
> PCI Config access mechanism. It also provides logic for selecting the
> correct Legacy PCI Config access mechanism and the corresponding boot log
> messages.
>
> Signed-off-by: Tony Camuso [email protected]
>
> diff --git a/arch/x86/pci/direct.c b/arch/x86/pci/direct.c
> index 431c9a5..4e78002 100644
> --- a/arch/x86/pci/direct.c
> +++ b/arch/x86/pci/direct.c
> @@ -175,6 +175,32 @@ static struct pci_raw_ops pci_direct_conf2 = {
> .write = pci_conf2_write,
> };
>
> +/*
> + * Legacy PCI Config read and write routines for buses that can't use
> + * MMCONFIG accesses in systems where MMCONFIG is the default PCI config
> + * access mechanism.
> + */
> +static struct pci_raw_ops *pci_legacy_conf;
> +
> +static int pci_ops_legacy_read(struct pci_bus *bus, unsigned int devfn,
> + int where, int size, u32 *value)
> +{
> + return pci_legacy_conf->read(0, bus->number, devfn, where,
> + size, value);
> +}
> +
> +static int pci_ops_legacy_write(struct pci_bus *bus, unsigned int devfn,
> + int where, int size, u32 value)
> +{
> + return pci_legacy_conf->write(0, bus->number, devfn, where,
> + size, value);
> +}
> +
> +struct pci_ops pci_legacy_ops = {
> + .read = pci_ops_legacy_read,
> + .write = pci_ops_legacy_write,
> +};
This whole structure is never used in this patch, why add it now?
> /*
> * Before we decide to use direct hardware access mechanisms, we try to do some
> @@ -258,18 +284,28 @@ void __init pci_direct_init(int type)
> {
> if (type == 0)
> return;
> - printk(KERN_INFO "PCI: Using configuration type %d\n", type);
> - if (type == 1)
> + if (type == 1) {
> raw_pci_ops = &pci_direct_conf1;
> - else
> + pci_legacy_conf = &pci_direct_conf1;
> + } else {
> raw_pci_ops = &pci_direct_conf2;
> + pci_legacy_conf = &pci_direct_conf2;
Why have two pointers to the same thing? What is pci_legacy_conf going
to be used for? Why not just use raw_pci_ops?
thanks,
greg k-h
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