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From: Robin Murphy <robin.murphy@arm.com>
To: Jordan Crouse <jcrouse@codeaurora.org>, iommu@lists.linux-foundation.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	will@kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 1/8] dt-bindings: arm-smmu: Add Adreno GPU variant
Date: Wed, 4 Dec 2019 15:55:57 +0000
Message-ID: <3a283a7c-df75-a30a-1bcb-74e631f06a71@arm.com> (raw)
In-Reply-To: <0101016e95751c0b-33c9379b-6b8c-43b1-8785-e5e1b6f084f1-000000@us-west-2.amazonses.com>

On 22/11/2019 11:31 pm, Jordan Crouse wrote:
> Add a compatible string to identify SMMUs that are attached
> to Adreno GPU devices that wish to support split pagetables.

A software policy decision is not, in itself, a good justification for a 
DT property. Is the GPU SMMU fundamentally different in hardware* from 
the other SMMU(s) in any given SoC?

(* where "hardware" may encompass hypervisor shenanigans)

> Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
> ---
> 
>   Documentation/devicetree/bindings/iommu/arm,smmu.yaml | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> index 6515dbe..db9f826 100644
> --- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
> @@ -31,6 +31,12 @@ properties:
>                 - qcom,sdm845-smmu-v2
>             - const: qcom,smmu-v2
>   
> +      - description: Qcom Adreno GPU SMMU iplementing split pagetables
> +        items:
> +          - enum:
> +              - qcom,adreno-smmu-v2
> +          - const: qcom,smmu-v2

Given that we already have per-SoC compatibles for Qcom SMMUs in 
general, this seems suspiciously vague.

Robin.

> +
>         - description: Qcom SoCs implementing "arm,mmu-500"
>           items:
>             - enum:
> 
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Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1574465484-7115-1-git-send-email-jcrouse@codeaurora.org>
2019-11-22 23:31 ` Jordan Crouse
2019-11-22 23:31 ` [PATCH v2 2/8] iommu: Add DOMAIN_ATTR_SPLIT_TABLES Jordan Crouse
2019-11-22 23:31 ` [PATCH v2 3/8] iommu/arm-smmu: Pass io_pgtable_cfg to impl specific init_context Jordan Crouse
2019-11-22 23:31 ` [PATCH v2 4/8] iommu/arm-smmu: Add split pagetables for Adreno IOMMU implementations Jordan Crouse
2019-11-22 23:31 ` [PATCH v2 5/8] drm/msm: Attach the IOMMU device during initialization Jordan Crouse
2019-11-22 23:32 ` [PATCH v2 7/8] drm/msm/a6xx: Support split pagetables Jordan Crouse
2019-11-22 23:32 ` [PATCH v2 8/8] arm64: dts: qcom: sdm845: Update Adreno GPU SMMU compatible string Jordan Crouse
2019-11-22 23:32 ` [PATCH v2 6/8] drm/msm: Refactor address space initialization Jordan Crouse
     [not found] ` <0101016e95751ea5-da4da251-ddba-4017-9258-b2cfd4e06f7f-000000@us-west-2.amazonses.com>
2019-12-03 19:14   ` [PATCH v2 1/8] dt-bindings: arm-smmu: Add Adreno GPU variant Rob Herring
     [not found] ` <0101016e95751c0b-33c9379b-6b8c-43b1-8785-e5e1b6f084f1-000000@us-west-2.amazonses.com>
2019-12-04 15:55   ` Robin Murphy [this message]
2019-12-04 18:01     ` Rob Clark
     [not found] ` <0101016e95752703-78491f46-41db-441c-b0fb-9a760e4d56cb-000000@us-west-2.amazonses.com>
2019-12-04 16:44   ` [PATCH v2 4/8] iommu/arm-smmu: Add split pagetables for Adreno IOMMU implementations Robin Murphy
2019-12-05 15:51     ` Jordan Crouse

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