On Tue, Apr 30, 2013 at 1:21 AM, Bin Gao <bin.gao@xxxxxxxxxxxxxxx> wrote:
> x86/pci/mrst: force all pci config access toward 0:0:0, 0:2:0 and 0:3:0 to type 1
>
> For real pci devices 0:0:0, 0:2:0 and 0:3:0, there is either no pci shim, or
> no guarantee of data correctness of offset 256-4k. So for whatever reason,
> Linux kernel should not do MMCFG pci config access to those devices. Instead,
> always use type 1 for those devices.
>
> Signed-off-by: Bin Gao <bin.gao@xxxxxxxxxxxxxxx>
I applied this to my for-linus branch and will try to put this in v3.10.
> ---
> arch/x86/pci/mrst.c | 10 ++++++----
> 1 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/pci/mrst.c b/arch/x86/pci/mrst.c
> index 6eb18c4..0e0fabf 100644
> --- a/arch/x86/pci/mrst.c
> +++ b/arch/x86/pci/mrst.c
> @@ -141,6 +141,11 @@ static int pci_device_update_fixed(struct pci_bus *bus, unsigned int devfn,
> */
> static bool type1_access_ok(unsigned int bus, unsigned int devfn, int reg)
> {
> + if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
> + || devfn == PCI_DEVFN(0, 0)
> + || devfn == PCI_DEVFN(3, 0)))
> + return 1;
> +
> /* This is a workaround for A0 LNC bug where PCI status register does
> * not have new CAP bit set. can not be written by SW either.
> *
> @@ -150,10 +155,7 @@ static bool type1_access_ok(unsigned int bus, unsigned int devfn, int reg)
> */
> if (reg >= 0x100 || reg == PCI_STATUS || reg == PCI_HEADER_TYPE)
> return 0;
> - if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
> - || devfn == PCI_DEVFN(0, 0)
> - || devfn == PCI_DEVFN(3, 0)))
> - return 1;
> +
> return 0; /* langwell on others */
> }
>
> --
> 1.7.4.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
