linux-kernel - Re: [PATCH 2/8] dt-bindings: document PASID property for IOMMU masters

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Date:   Mon, 8 Jul 2019 09:58:30 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        will.deacon@....com
Cc:     joro@...tes.org, robh+dt@...nel.org, mark.rutland@....com,
        robin.murphy@....com, jacob.jun.pan@...ux.intel.com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/8] dt-bindings: document PASID property for IOMMU
 masters

Hi Jean,

On 6/10/19 8:47 PM, Jean-Philippe Brucker wrote:
> On Arm systems, some platform devices behind an SMMU may support the PASID
> feature, which offers multiple address space. Let the firmware tell us
> when a device supports PASID.
> 
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@....com>
> ---
> Previous discussion on this patch last year:
> https://patchwork.ozlabs.org/patch/872275/
> I split PASID and stall definitions, keeping only PASID here.
> ---
>  Documentation/devicetree/bindings/iommu/iommu.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iommu/iommu.txt b/Documentation/devicetree/bindings/iommu/iommu.txt
> index 5a8b4624defc..3c36334e4f94 100644
> --- a/Documentation/devicetree/bindings/iommu/iommu.txt
> +++ b/Documentation/devicetree/bindings/iommu/iommu.txt
> @@ -86,6 +86,12 @@ have a means to turn off translation. But it is invalid in such cases to
>  disable the IOMMU's device tree node in the first place because it would
>  prevent any driver from properly setting up the translations.
>  
> +Optional properties:
> +--------------------
> +- pasid-num-bits: Some masters support multiple address spaces for DMA, by
> +  tagging DMA transactions with an address space identifier. By default,
> +  this is 0, which means that the device only has one address space.
> +
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric
>  
>  Notes:
>  ======
>