On certain HiSilicon platforms (Hip06/Hip07) the GIC ITS and PCIe RC deviates from the standard implementation and this breaks PCIe MSI functionality when SMMU is enabled. The HiSilicon erratum 161010801 describes this limitation of certain HiSilicon platforms to support the SMMU mappings for MSI transactions. On these platforms GICv3 ITS translator is presented with the deviceID by extending the MSI payload data to 64 bits to include the deviceID. Hence, the PCIe controller on this platforms has to differentiate the MSI payload against other DMA payload and has to modify the MSI payload. This basically makes it difficult for this platforms to have a SMMU translation for MSI. This patch implements a ACPI table based quirk to reserve the hw msi regions in the smmu-v3 driver which means these address regions will not be translated and will be excluded from iova alloactions. To implement this quirk, the following changes are incorporated into smmu-v3: 1. Added a general erratum framework based on arm_arch_timer erratum framework. The intention is to have a common framework for dt and acpi based quirk implementations. 2. Replaced the existing hisilicon, broken_prefetch_cmd quirk using the new erratum framework (erratum-161010701) 3. Introduced a ACPI based quirk for erratum-161010801. 4. ACPI CSRT vendor specific blobs are used to pass the reserve address region info on these platforms. Also please note that this patchset is based on Robin's patch series "acpica: iort: Update SMMU models for IORT rev. C". https://lkml.org/lkml/2017/5/12/211 Thanks, Shameer shameer (7): iommu/arm-smmu-v3: Add erratum framework structures iommu/arm-smmu-v3: Add erratum framework functions iommu/arm-smmu-v3: Replace the device tree binding for hisilicon broken prefetch cmd with erratum id iommu/arm-smmu-v3: Enable HiSilicon erratum 161010701 iommu/arm-smmu-v3: Enable ACPI based HiSilicon erratum 161010701 iommu/arm-smmu-v3: Rearrange msi resv alloc functions iommu/arm-smmu-v3: Enable ACPI based HiSilicon erratum 161010801 .../devicetree/bindings/iommu/arm,smmu-v3.txt | 2 +- arch/arm64/Kconfig | 20 +- drivers/iommu/arm-smmu-v3.c | 225 ++++++++++++++++++--- 3 files changed, 218 insertions(+), 29 deletions(-) -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
