linux-kernel - Re: [PATCH] iommu/arm-smmu: Add a init_context

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Message-ID: <20200713151123.GB3072@willie-the-truck>
Date:   Mon, 13 Jul 2020 16:11:23 +0100
From:   Will Deacon <will@...nel.org>
To:     Jordan Crouse <jcrouse@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        freedreno@...ts.freedesktop.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu: Add a init_context_bank implementation
 hook

On Thu, Jun 11, 2020 at 04:36:56PM -0600, Jordan Crouse wrote:
> Add a new implementation hook to allow the implementation specific code
> to tweek the context bank configuration just before it gets written.
> The first user will be the Adreno GPU implementation to turn on
> SCTLR.HUPCF to ensure that a page fault doesn't terminating pending
> transactions. Doing so could hang the GPU if one of the terminated
> transactions is a CP read.
> 
> This depends on the arm-smmu adreno SMMU implementation [1].
> 
> [1] https://patchwork.kernel.org/patch/11600943/
> 
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> ---
> 
>  drivers/iommu/arm-smmu-qcom.c | 13 +++++++++++++
>  drivers/iommu/arm-smmu.c      | 28 +++++++++++++---------------
>  drivers/iommu/arm-smmu.h      | 11 +++++++++++
>  3 files changed, 37 insertions(+), 15 deletions(-)

This looks straightforward enough, but I don't want to merge this without
a user and Sai's series has open questions afaict.

Will