linux-kernel - [PATCH v5 0/3] iommu/arm-smmu-qcom: Support maintaining bootloader mappings

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Message-Id: <20201019182323.3162386-1-bjorn.andersson@linaro.org>
Date:   Mon, 19 Oct 2020 11:23:20 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     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>,
        Thierry Reding <treding@...dia.com>,
        Rob Clark <robdclark@...omium.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH v5 0/3] iommu/arm-smmu-qcom: Support maintaining bootloader mappings

This is the revised fourth attempt of inheriting the stream mapping for
the framebuffer on many Qualcomm platforms, in order to not hit
catastrophic faults during arm-smmu initialization.

The new approach does, based on Robin's suggestion, take a much more
direct approach with the allocation of a context bank for bypass
emulation and use of this context bank pretty much isolated to the
Qualcomm specific implementation.

The patchset has been tested to boot DB845c and RB5 (with splash screen)
and Lenovo Yoga C630 (with EFI framebuffer).

Bjorn Andersson (3):
  iommu/arm-smmu: Allow implementation specific write_s2cr
  iommu/arm-smmu-qcom: Read back stream mappings
  iommu/arm-smmu-qcom: Implement S2CR quirk

 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 90 ++++++++++++++++++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.c      | 13 +++-
 drivers/iommu/arm/arm-smmu/arm-smmu.h      |  1 +
 3 files changed, 101 insertions(+), 3 deletions(-)

-- 
2.28.0