linux-kernel - Re: [PATCH] dt-bindings: virtio: Convert virtio,pci-iommu to DT schema

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Date:   Thu, 22 Sep 2022 16:54:09 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        virtualization@...ts.linux-foundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: virtio: Convert virtio,pci-iommu to DT
 schema

On Sun, Sep 18, 2022 at 10:23:06AM +0100, Krzysztof Kozlowski wrote:
> > +required:
> 
> Also: compatible
> 
> > +  - reg
> > +  - '#iommu-cells'
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    pcie0 {
> 
> Node name: pcie
> 
> > +        #address-cells = <3>;
> > +        #size-cells = <2>;
> > +
> 
> device_type and then you will see a bunch of warnings.

Right, I think I wanted to avoid pulling the whole PCIe baggage because it
requires a lot of properties that aren't relevant to the example. But
having tried it it's not too bad, and it ensures we validate the child
node.

Thanks,
Jean

> 
> > +        /*
> > +         * The IOMMU manages all functions in this PCI domain except
> > +         * itself. Omit BDF 00:01.0.
> > +         */
> > +        iommu-map = <0x0 &iommu0 0x0 0x8
> > +                     0x9 &iommu0 0x9 0xfff7>;
> > +
> > +        /* The IOMMU programming interface uses slot 00:01.0 */
> > +        iommu0: iommu@1,0 {
> > +            compatible = "pci1af4,1057";
> > +            reg = <0x800 0 0 0 0>;
> > +            #iommu-cells = <1>;
> > +        };
> > +    };
> > +
> > +    pcie1 {
> 
> Node name: pcie (so probably you will need unit address and reg)
> 
> > +        /*
> > +         * The IOMMU also manages all functions from this domain,
> > +         * with endpoint IDs 0x10000 - 0x1ffff
> > +         */
> > +        iommu-map = <0x0 &iommu0 0x10000 0x10000>;
> > +    };
> > +
> > +    ethernet {
> > +        /* The IOMMU manages this platform device with endpoint ID 0x20000 */
> > +        iommus = <&iommu0 0x20000>;
> > +    };
> > +
> > +...
> 
> 
> Best regards,
> Krzysztof