On Fri, May 25, 2012 at 11:02:13AM -0300, Jan Kiszka wrote:
> According to Alexey, the T310 does not properly support INTx masking as
> it fails to keep the PCI_STATUS_INTERRUPT bit updated once the interrupt
> is masked. Mark this adapter as broken so that pci_intx_mask_supported
> won't report it as compatible.
>
> Reported-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxx>
Just a thought: would be nice to have a way to discover
the quirk was activated. Add an attribute so that
userspace can detect and report this properly to users?
Or just log a warning message ...
> ---
>
> Alexey, please test if this catches your case correctly.
>
> drivers/pci/pci.c | 3 +++
> drivers/pci/quirks.c | 12 ++++++++++++
> include/linux/pci.h | 2 ++
> 3 files changed, 17 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 8f16900..3a1aeb5 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -2876,6 +2876,9 @@ bool pci_intx_mask_supported(struct pci_dev *dev)
> bool mask_supported = false;
> u16 orig, new;
>
> + if (dev->broken_intx_masking)
> + return false;
> +
> pci_cfg_access_lock(dev);
>
> pci_read_config_word(dev, PCI_COMMAND, &orig);
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 2a75216..151e174 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -2929,6 +2929,18 @@ static void __devinit disable_igfx_irq(struct pci_dev *dev)
> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0102, disable_igfx_irq);
> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x010a, disable_igfx_irq);
>
> +/*
> + * Some devices may pass our check in pci_intx_mask_supported if
> + * PCI_COMMAND_INTX_DISABLE works though they actually do not properly
> + * support this feature.
> + */
> +static void __devinit quirk_broken_intx_masking(struct pci_dev *dev)
> +{
> + dev->broken_intx_masking = 1;
> +}
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CHELSIO, 0x0010,
> + quirk_broken_intx_masking);
> +
> static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
> struct pci_fixup *end)
> {
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 17b7b5b..c7cfd73 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -324,6 +324,8 @@ struct pci_dev {
> unsigned int is_hotplug_bridge:1;
> unsigned int __aer_firmware_first_valid:1;
> unsigned int __aer_firmware_first:1;
> + unsigned int broken_intx_masking:1; /* device's INTx masking
> + support is not working */
> pci_dev_flags_t dev_flags;
> atomic_t enable_cnt; /* pci_enable_device has been called */
>
> --
> 1.7.3.4
> --
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