Messages in this thread | | | Date | Tue, 7 Mar 2023 18:58:13 +0200 | Subject | Re: [PATCH v3 6/6] iommu/qcom: Add support for QSMMUv2 and QSMMU-500 secured contexts | From | Dmitry Baryshkov <> |
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On 15/11/2022 12:11, AngeloGioacchino Del Regno wrote: > On some SoCs like MSM8956, MSM8976 and others, secure contexts are > also secured: these get programmed by the bootloader or TZ (as usual) > but their "interesting" registers are locked out by the hypervisor, > disallowing direct register writes from Linux and, in many cases, > completely disallowing the reprogramming of TTBR, TCR, MAIR and other > registers including, but not limited to, resetting contexts. > This is referred downstream as a "v2" IOMMU but this is effectively > a "v2 firmware configuration" instead. > > Luckily, the described behavior of version 2 is effective only on > secure contexts and not on non-secure ones: add support for that, > finally getting a completely working IOMMU on at least MSM8956/76. > > Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org> > [Marijn: Rebased over next-20221111] > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> > --- > drivers/iommu/arm/arm-smmu/qcom_iommu.c | 22 +++++++++++++++++++--- > 1 file changed, 19 insertions(+), 3 deletions(-)
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
-- With best wishes Dmitry
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