Add a driver for the ACPI VIOT table, which provides topology information for para-virtual IOMMUs. Enable virtio-iommu on non-devicetree platforms, including x86. Since v4 [1]: * Fixes (comments, wrong argument, unused variable) * Removed patch 5 that wrongly moved set_dma_ops(dev, NULL) into dma-iommu. The simplification of limit parameters for x86 callers is now in patch 4. * Release ACPI table after parsing * Added review and tested tags, thanks for all the feedback! You can find a QEMU implementation at [2], with extra support for testing all VIOT nodes including MMIO-based endpoints and IOMMU. This series is at [3]. [1] https://lore.kernel.org/linux-iommu/20210610075130.67517-1-jean-philippe@xxxxxxxxxx/ [2] https://jpbrucker.net/git/qemu/log/?h=virtio-iommu/acpi [3] https://jpbrucker.net/git/linux/log/?h=virtio-iommu/acpi Jean-Philippe Brucker (5): ACPI: arm64: Move DMA setup operations out of IORT ACPI: Move IOMMU setup code out of IORT ACPI: Add driver for the VIOT table iommu/dma: Pass address limit rather than size to iommu_setup_dma_ops() iommu/virtio: Enable x86 support drivers/acpi/Kconfig | 3 + drivers/iommu/Kconfig | 4 +- drivers/acpi/Makefile | 2 + drivers/acpi/arm64/Makefile | 1 + include/acpi/acpi_bus.h | 3 + include/linux/acpi.h | 3 + include/linux/acpi_iort.h | 14 +- include/linux/acpi_viot.h | 19 ++ include/linux/dma-iommu.h | 4 +- arch/arm64/mm/dma-mapping.c | 2 +- drivers/acpi/arm64/dma.c | 50 +++++ drivers/acpi/arm64/iort.c | 128 ++---------- drivers/acpi/bus.c | 2 + drivers/acpi/scan.c | 78 +++++++- drivers/acpi/viot.c | 366 +++++++++++++++++++++++++++++++++++ drivers/iommu/amd/iommu.c | 2 +- drivers/iommu/dma-iommu.c | 13 +- drivers/iommu/intel/iommu.c | 5 +- drivers/iommu/virtio-iommu.c | 11 ++ MAINTAINERS | 8 + 20 files changed, 581 insertions(+), 137 deletions(-) create mode 100644 include/linux/acpi_viot.h create mode 100644 drivers/acpi/arm64/dma.c create mode 100644 drivers/acpi/viot.c -- 2.32.0
