Re: [PATCH] pci: quirks: Add ACS quirk for Solarflare SFC9120 & SFC9140

[Bjorn Helgaas]

On Wed, Sep 17, 2014 at 08:59:36AM -0600, Alex Williamson wrote:
> Solarflare confirms that these devices do not allow peer-to-peer
> between functions.  Quirk them to allow IOMMU grouping to expose this
> isolation.
> 
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> Cc: Robert Stonehouse <rstonehouse@xxxxxxxxxxxxxx>

Applied with Robert's ack to pci/virtualization for v3.18, thanks!

> ---
> 
>  drivers/pci/quirks.c |   17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 80c2d01..78cc83f 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3664,6 +3664,21 @@ static int pci_quirk_intel_pch_acs(struct pci_dev *dev, u16 acs_flags)
>  	return acs_flags & ~flags ? 0 : 1;
>  }
>  
> +static int pci_quirk_solarflare_acs(struct pci_dev *dev, u16 acs_flags)
> +{
> +	/*
> +	 * SV, TB, and UF are not relevant to multifunction endpoints.
> +	 *
> +	 * Solarflare indicates that peer-to-peer between functions is not
> +	 * possible, therefore RR, CR, and DT are not implemented.  Mask
> +	 * these out as if they were clear in the ACS capabilities register.
> +	 */
> +	acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR |
> +		       PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT);
> +
> +	return acs_flags ? 0 : 1;
> +}
> +
>  static const struct pci_dev_acs_enabled {
>  	u16 vendor;
>  	u16 device;
> @@ -3675,6 +3690,8 @@ static const struct pci_dev_acs_enabled {
>  	{ PCI_VENDOR_ID_ATI, 0x439d, pci_quirk_amd_sb_acs },
>  	{ PCI_VENDOR_ID_ATI, 0x4384, pci_quirk_amd_sb_acs },
>  	{ PCI_VENDOR_ID_ATI, 0x4399, pci_quirk_amd_sb_acs },
> +	{ PCI_VENDOR_ID_SOLARFLARE, 0x0903, pci_quirk_solarflare_acs },
> +	{ PCI_VENDOR_ID_SOLARFLARE, 0x0923, pci_quirk_solarflare_acs },
>  	{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_pch_acs },
>  	{ 0 }
>  };
> 
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