linux-kernel - Re: [PATCH 1/1] iommu/vt-d: Select PCI

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Message-ID: <20210608093453.GB8935@willie-the-truck>
Date:   Tue, 8 Jun 2021 10:34:53 +0100
From:   Will Deacon <will@...nel.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, ashok.raj@...el.com,
        kevin.tian@...el.com, jacob.jun.pan@...el.com, yi.l.liu@...el.com,
        sanjay.k.kumar@...el.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu/vt-d: Select PCI_ATS explicitly

On Wed, May 12, 2021 at 02:53:13PM +0800, Lu Baolu wrote:
> The Intel VT-d implementation supports device TLB management. Select
> PCI_ATS explicitly so that the pci_ats helpers are always available.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/intel/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iommu/intel/Kconfig b/drivers/iommu/intel/Kconfig
> index 28a3d1596c76..7e5b240b801d 100644
> --- a/drivers/iommu/intel/Kconfig
> +++ b/drivers/iommu/intel/Kconfig
> @@ -14,6 +14,7 @@ config INTEL_IOMMU
>  	select SWIOTLB
>  	select IOASID
>  	select IOMMU_DMA
> +	select PCI_ATS
>  	help
>  	  DMA remapping (DMAR) devices support enables independent address
>  	  translations for Direct Memory Access (DMA) from devices.

Acked-by: Will Deacon <will@...nel.org>

Will