| Message ID | 20230622092742.74819-7-angelogioacchino.delregno@collabora.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Add support for Qualcomm's legacy IOMMU v2 | expand |
On 22.06.2023 11:27, 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> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > --- Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Konrad > drivers/iommu/arm/arm-smmu/qcom_iommu.c | 19 +++++++++++++++++-- > 1 file changed, 17 insertions(+), 2 deletions(-) > > diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c > index 9786fd094e7d..7b6241f36698 100644 > --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c > +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c > @@ -59,6 +59,7 @@ struct qcom_iommu_ctx { > struct device *dev; > void __iomem *base; > bool secure_init; > + bool secured_ctx; > u8 asid; /* asid and ctx bank # are 1:1 */ > struct iommu_domain *domain; > }; > @@ -273,6 +274,12 @@ static int qcom_iommu_init_domain(struct iommu_domain *domain, > ctx->secure_init = true; > } > > + /* Secured QSMMU-500/QSMMU-v2 contexts cannot be programmed */ > + if (ctx->secured_ctx) { > + ctx->domain = domain; > + continue; > + } > + > /* Disable context bank before programming */ > iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0); > > @@ -669,10 +676,14 @@ static int qcom_iommu_ctx_probe(struct platform_device *pdev) > if (irq < 0) > return -ENODEV; > > + if (of_device_is_compatible(dev->of_node, "qcom,msm-iommu-v2-sec")) > + ctx->secured_ctx = true; > + > /* clear IRQs before registering fault handler, just in case the > * boot-loader left us a surprise: > */ > - iommu_writel(ctx, ARM_SMMU_CB_FSR, iommu_readl(ctx, ARM_SMMU_CB_FSR)); > + if (!ctx->secured_ctx) > + iommu_writel(ctx, ARM_SMMU_CB_FSR, iommu_readl(ctx, ARM_SMMU_CB_FSR)); > > ret = devm_request_irq(dev, irq, > qcom_iommu_fault, > @@ -712,6 +723,8 @@ static void qcom_iommu_ctx_remove(struct platform_device *pdev) > static const struct of_device_id ctx_of_match[] = { > { .compatible = "qcom,msm-iommu-v1-ns" }, > { .compatible = "qcom,msm-iommu-v1-sec" }, > + { .compatible = "qcom,msm-iommu-v2-ns" }, > + { .compatible = "qcom,msm-iommu-v2-sec" }, > { /* sentinel */ } > }; > > @@ -729,7 +742,8 @@ static bool qcom_iommu_has_secure_context(struct qcom_iommu_dev *qcom_iommu) > struct device_node *child; > > for_each_child_of_node(qcom_iommu->dev->of_node, child) { > - if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec")) { > + if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec") || > + of_device_is_compatible(child, "qcom,msm-iommu-v2-sec")) { > of_node_put(child); > return true; > } > @@ -873,6 +887,7 @@ static const struct dev_pm_ops qcom_iommu_pm_ops = { > > static const struct of_device_id qcom_iommu_of_match[] = { > { .compatible = "qcom,msm-iommu-v1" }, > + { .compatible = "qcom,msm-iommu-v2" }, > { /* sentinel */ } > }; >
diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c index 9786fd094e7d..7b6241f36698 100644 --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c @@ -59,6 +59,7 @@ struct qcom_iommu_ctx { struct device *dev; void __iomem *base; bool secure_init; + bool secured_ctx; u8 asid; /* asid and ctx bank # are 1:1 */ struct iommu_domain *domain; }; @@ -273,6 +274,12 @@ static int qcom_iommu_init_domain(struct iommu_domain *domain, ctx->secure_init = true; } + /* Secured QSMMU-500/QSMMU-v2 contexts cannot be programmed */ + if (ctx->secured_ctx) { + ctx->domain = domain; + continue; + } + /* Disable context bank before programming */ iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0); @@ -669,10 +676,14 @@ static int qcom_iommu_ctx_probe(struct platform_device *pdev) if (irq < 0) return -ENODEV; + if (of_device_is_compatible(dev->of_node, "qcom,msm-iommu-v2-sec")) + ctx->secured_ctx = true; + /* clear IRQs before registering fault handler, just in case the * boot-loader left us a surprise: */ - iommu_writel(ctx, ARM_SMMU_CB_FSR, iommu_readl(ctx, ARM_SMMU_CB_FSR)); + if (!ctx->secured_ctx) + iommu_writel(ctx, ARM_SMMU_CB_FSR, iommu_readl(ctx, ARM_SMMU_CB_FSR)); ret = devm_request_irq(dev, irq, qcom_iommu_fault, @@ -712,6 +723,8 @@ static void qcom_iommu_ctx_remove(struct platform_device *pdev) static const struct of_device_id ctx_of_match[] = { { .compatible = "qcom,msm-iommu-v1-ns" }, { .compatible = "qcom,msm-iommu-v1-sec" }, + { .compatible = "qcom,msm-iommu-v2-ns" }, + { .compatible = "qcom,msm-iommu-v2-sec" }, { /* sentinel */ } }; @@ -729,7 +742,8 @@ static bool qcom_iommu_has_secure_context(struct qcom_iommu_dev *qcom_iommu) struct device_node *child; for_each_child_of_node(qcom_iommu->dev->of_node, child) { - if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec")) { + if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec") || + of_device_is_compatible(child, "qcom,msm-iommu-v2-sec")) { of_node_put(child); return true; } @@ -873,6 +887,7 @@ static const struct dev_pm_ops qcom_iommu_pm_ops = { static const struct of_device_id qcom_iommu_of_match[] = { { .compatible = "qcom,msm-iommu-v1" }, + { .compatible = "qcom,msm-iommu-v2" }, { /* sentinel */ } };