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SubjectRe: [PATCH 1/1] ia64/pci: set mmio decoding on for some host bridge
Hi Bjorn,

I tested on an X86 system with the same chipset, and this bug does not
happen.
I am not sure why , but if it is needed, I will try to find out why.

Thanks
ZhenHua

On 07/09/2013 01:42 PM, Li, Zhen-Hua wrote:
> On some IA64 platforms with intel PCI bridge, for example, HP BL890c i2
> with Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port,
> when kernel tries to disable the mmio decoding on the PCI bridge devices,
> kernel may crash.
>
> And in the comment of function quirk_mmio_always_on, it also says:
> "But doing so (disable the mmio decoding) may cause problems on host bridge
> and perhaps other key system devices"
>
> So, for this PCI bridge, dev->mmio_always_on bit should be set to 1.
>
> To avoid affecting the use of quirk_mmio_always_on, a new function is created.
>
> Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
> ---
> drivers/pci/quirks.c | 17 +++++++++++++++++
> include/linux/pci_ids.h | 1 +
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index e85d230..665af3e 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -44,6 +44,23 @@ static void quirk_mmio_always_on(struct pci_dev *dev)
> DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_ANY_ID, PCI_ANY_ID,
> PCI_CLASS_BRIDGE_HOST, 8, quirk_mmio_always_on);
>
> +#ifdef CONFIG_IA64
> +/*
> + * On some IA64 platforms, for some intel PCI bridge devices, for example,
> + * the Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port,
> + * disable the mmio decoding on this device may cause system crash.
> + * So dev->mmio_always_on bit should be set to 1.
> + */
> +static void quirk_mmio_on_intel_pcibridge(struct pci_dev *dev)
> +{
> + dev->mmio_always_on = 1;
> +}
> +DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL,
> + PCI_DEVICE_ID_INTEL_5520_5550_X58,
> + PCI_CLASS_BRIDGE_PCI,
> + 8, quirk_mmio_on_intel_pcibridge);
> +#endif
> +
> /* The Mellanox Tavor device gives false positive parity errors
> * Mark this device with a broken_parity_status, to allow
> * PCI scanning code to "skip" this now blacklisted device.
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index 3bed2e8..d8c60b7 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -2742,6 +2742,7 @@
> #define PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_RANK_REV2 0x2db2
> #define PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_TC_REV2 0x2db3
> #define PCI_DEVICE_ID_INTEL_82855PM_HB 0x3340
> +#define PCI_DEVICE_ID_INTEL_5520_5550_X58 0x3408
> #define PCI_DEVICE_ID_INTEL_IOAT_TBG4 0x3429
> #define PCI_DEVICE_ID_INTEL_IOAT_TBG5 0x342a
> #define PCI_DEVICE_ID_INTEL_IOAT_TBG6 0x342b



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