linux-kernel - Re: [PATCH] PCI: Add ATS-disable quirk for AMD Stoney GPUs

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Message-ID: <1491569585.6021.15.camel@infradead.org>
Date:   Fri, 07 Apr 2017 14:53:05 +0200
From:   David Woodhouse <dwmw2@...radead.org>
To:     Joerg Roedel <joro@...tes.org>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Daniel Drake <drake@...lessm.com>,
        Alexander Deucher <Alexander.Deucher@....com>,
        Samuel Sieb <samuel@...b.net>, Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH] PCI: Add ATS-disable quirk for AMD Stoney GPUs

On Fri, 2017-04-07 at 14:40 +0200, Joerg Roedel wrote:
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 6736836..3bc9856 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -4634,3 +4634,22 @@ static void quirk_no_aersid(struct pci_dev *pdev)
>  DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2031, quirk_no_aersid);
>  DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2032, quirk_no_aersid);
>  DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2033, quirk_no_aersid);
> +
> +/*
> + * Some devices have a broken ATS implementation causing IOMMU stalls.
> + * Don't use ATS for those devices.
> + */
> +static void quirk_disable_ats(struct pci_dev *pdev)
> +{
> +#ifdef CONFIG_PCI_ATS
> +       /*
> +        * Set pdev->ats_cap = 0 to make pci_enable_ats() bail out
> +        * early.
> +        */
> +       dev_info(&pdev->dev, "QUIRK: Disabling ATS");
> +       pdev->ats_cap = 0;
> +#endif
> +}
> +
> +/* AMD Stoney platform GPU */
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_disable_ats);

Why not put the #ifdef around *all* of the above?
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