linux-kernel - x86: PCI multi domain/segment config access

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Message-Id: <20080711211347.6461.68923.91734@attica.americas.sgi.com>
Date:	Fri, 11 Jul 2008 16:13:47 -0500 (CDT)
From:	John Keller <jpk@....com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-pci@...r.kernel.org, John Keller <jpk@....com>
Subject: x86: PCI multi domain/segment config access

On x86 PCI Config space access to domains/segments > 0 appears to be broken.
The noted patch related to PCI ext config space has all config accesses
to offsets < 256 using conf1 if available, which is most likely the case.

This would force usage of conf1 for non-extended config access (< 256) on
PCI domains > 0.

Am I missing something, or how would a conf1 access reference a domain
other than zero?

John
------------

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=b6ce068a1285a24185b01be8a49021827516b3e1




int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
                                                int reg, int len, u32 *val)
{
        if (reg < 256 && raw_pci_ops)
                return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
        if (raw_pci_ext_ops)
                return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
        return -EINVAL;
}

int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
                                                int reg, int len, u32 val)
{
        if (reg < 256 && raw_pci_ops)
                return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
        if (raw_pci_ext_ops)
                return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
        return -EINVAL;
}



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