linux-kernel - Re: [PATCH v3 0/8] iommu/arm-smmu: Support maintaining bootloader mappings

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Message-ID: <c1cce546-0c49-05e2-8c54-5f343db273c8@connolly.tech>
Date:   Mon, 07 Sep 2020 18:49:21 +0000
From:   Caleb Connolly <caleb@...nolly.tech>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Rob Clark <robdclark@...omium.org>
Cc:     Sibi Sankar <sibis@...eaurora.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 0/8] iommu/arm-smmu: Support maintaining bootloader mappings

On 2020-09-04 16:55, Bjorn Andersson wrote:
> Based on previous attempts and discussions this is the latest attempt at
> inheriting stream mappings set up by the bootloader, for e.g. boot splash or
> efifb.
>
> Per Will's request this builds on the work by Jordan and Rob for the Adreno
> SMMU support. It applies cleanly ontop of v16 of their series, which can be
> found at
> https://lore.kernel.org/linux-arm-msm/20200901164707.2645413-1-robdclark@gmail.com/
>
> Bjorn Andersson (8):
>    iommu/arm-smmu: Refactor context bank allocation
>    iommu/arm-smmu: Delay modifying domain during init
>    iommu/arm-smmu: Consult context bank allocator for identify domains
>    iommu/arm-smmu-qcom: Emulate bypass by using context banks
>    iommu/arm-smmu-qcom: Consistently initialize stream mappings
>    iommu/arm-smmu: Add impl hook for inherit boot mappings
>    iommu/arm-smmu: Provide helper for allocating identity domain
>    iommu/arm-smmu-qcom: Setup identity domain for boot mappings
>
>   drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 111 ++++++++++++++++++-
>   drivers/iommu/arm/arm-smmu/arm-smmu.c      | 122 ++++++++++++++-------
>   drivers/iommu/arm/arm-smmu/arm-smmu.h      |  14 ++-
>   3 files changed, 205 insertions(+), 42 deletions(-)
>

Tested on the OnePlus 6 (SDM845), allows booting with display enabled.