linux-kernel - Re: [PATCH] PCI: Mark INTx masking support of Chelsio T310 10GbE NIC as broken

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Date:	Fri, 25 May 2012 08:11:53 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Gibson <david@...son.dropbear.id.au>,
	Alexander Graf <agraf@...e.de>, kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH] PCI: Mark INTx masking support of Chelsio T310 10GbE NIC
 as broken

On Fri, May 25, 2012 at 8:02 AM, Jan Kiszka <jan.kiszka@...mens.com> 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.

Please include a reference to a bugzilla, mailing list discussion, or
other details about how this was found and debugged.  Thanks!

> Reported-by: Alexey Kardashevskiy <aik@...abs.ru>
> Signed-off-by: Jan Kiszka <jan.kiszka@....de>
> ---
>
> 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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