* Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> On Wed, Feb 4, 2009 at 8:39 AM, Ed Swierk <eswierk@xxxxxxxxxxxxxxxxxx> wrote:
> > Detect and enable memory-mapped PCI configuration space on the nVidia
> > MCP55 southbridge even if the ACPI MCFG table is missing or wrong.
> >
> > Signed-off-by: Ed Swierk <eswierk@xxxxxxxxxxxxxxxxxx>
> >
> > ---
> > Index: linux-2.6.27.4/arch/x86/pci/mmconfig-shared.c
> > ===================================================================
> > --- linux-2.6.27.4.orig/arch/x86/pci/mmconfig-shared.c
> > +++ linux-2.6.27.4/arch/x86/pci/mmconfig-shared.c
> > @@ -155,6 +155,26 @@ static const char __init *pci_mmcfg_amd_
> > return "AMD Family 10h NB";
> > }
> >
> > +static const char __init *pci_mmcfg_nvidia_mcp55(void)
> > +{
> > + u32 extcfg;
> > +
> > + raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0x90, 4, &extcfg);
> > +
> > + if (!(extcfg & 0x80000000))
> > + return NULL;
> > + pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
> > + if (!pci_mmcfg_config)
> > + return NULL;
> > + pci_mmcfg_config[0].address = (extcfg & 0x00007fff) << 25;
> > + pci_mmcfg_config[0].pci_segment = 0;
> > + pci_mmcfg_config[0].start_bus_number = 0;
> > + pci_mmcfg_config[0].end_bus_number = (1 << (8 - ((extcfg >> 28) & 3))) - 1;
> > + pci_mmcfg_config_num = 1;
> > +
> > + return "nVidia MCP55";
> > +}
> > +
> > struct pci_mmcfg_hostbridge_probe {
> > u32 bus;
> > u32 devfn;
> > @@ -172,6 +192,8 @@ static struct pci_mmcfg_hostbridge_probe
> > 0x1200, pci_mmcfg_amd_fam10h },
> > { 0xff, PCI_DEVFN(0, 0), PCI_VENDOR_ID_AMD,
> > 0x1200, pci_mmcfg_amd_fam10h },
> > + { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_NVIDIA,
> > + 0x0369, pci_mmcfg_nvidia_mcp55 },
>
> may break amd family 10h + mcp55 system. because some system have setting
> in AMD cpu and mcp55 it will find setting in CPU nb, and your code will
> partially overwrite those setting.
That's a good point ...
We could do something like:
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
boot_cpu_data.x86 >= 0x10) {
u64 mmconf_val;
rdmsrl(MSR_FAM10H_MMIO_CONF_BASE, mmconf_val);
if (mmconf_val & FAM10H_MMIO_CONF_ENABLE)
return;
}
To detect enabled on-CPU mmconf support. We could even put this into a
helper function as other places might want to use it too.
Ingo
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