This RFC patch series is v3 of a previous posting: https://lkml.org/lkml/2016/6/7/523 v2 -> v3 - Rebased on top of dependencies series [1][2][3](v4.7-rc3) - Added back reliance on ACPI early probing infrastructure - Patch[1-3] merged through other dependent series - Added back IOMMU fwnode generalization - Move SMMU v3 static functions configuration to IORT code - Implemented generic IOMMU fwspec API - Added code to implement fwnode platform device look-up v1 -> v2: - Rebased on top of dependencies series [1][2][3](v4.7-rc1) - Removed IOMMU fwnode generalization - Implemented ARM SMMU v3 ACPI probing instead of ARM SMMU v2 owing to patch series dependencies [1] - Moved platform device creation logic to IORT code to generalize its usage for ARM SMMU v1-v2-v3 components - Removed reliance on ACPI early device probing - Created IORT specific iommu_xlate() translation hook leaving OF code unchanged according to v1 reviews The ACPI IORT table provides information that allows instantiating ARM SMMU devices and carrying out id mappings between components on ARM based systems (devices, IOMMUs, interrupt controllers). http://infocenter.arm.com/help/topic/com.arm.doc.den0049b/DEN0049B_IO_Remapping_Table.pdf Building on basic IORT support, available through [2]: this patchset enables ARM SMMU v3 support on ACPI systems. Most of the code is aimed at building the required generic ACPI infrastructure to create and enable IOMMU components and to bring the IOMMU infrastructure for ACPI on par with DT, which is going to make future ARM SMMU components easier to integrate. PATCH (1) adds a FWNODE_IOMMU type to the struct fwnode_handle type. It is required to attach a fwnode identifier to platform devices allocated/detected through IORT tables entries; IOMMU devices have to have an identifier to look them up eg IOMMU core layer carrying out id translation. This can be done through a fwnode_handle (ie IOMMU platform devices created out of IORT tables are not ACPI devices hence they can't be allocated as such, otherwise they would have a fwnode_handle of type FWNODE_ACPI). This patch requires discussion and it is key to the RFC. PATCH (2) makes use of the ACPI early probing API to add a linker script section for probing devices via IORT ACPI kernel code. PATCH (3) provides IORT support for registering IOMMU IORT node through their fwnode handle. PATCH (4) implements core code fwnode based platform devices look-up. PATCH (5) extends iommu_fwspec so that it can be used on ACPI based system by creating a generic IOMMU fwspec kernel layer. PATCH (6) implements the of_dma_configure() API in ACPI world - acpi_dma_configure() - and patches PCI and ACPI core code to start making use of it. PATCH (7) provides an IORT function to detect existence of specific type of IORT components. PATCH (8) creates the kernel infrastructure required to create ARM SMMU platform devices for IORT nodes. PATCH (9) refactors the ARM SMMU v3 driver so that the init functions are split in a way that groups together code that probes through DT and code that carries out HW registers FW agnostic probing, in preparation for adding the ACPI probing path. PATCH (10) rework ARM SMMU v3 platform driver registration to make it work on ACPI systems. PATCH (11) Building on patch (8), it adds ARM SMMU v3 IORT IOMMU operations to create and probe ARM SMMU v3 components. PATCH (12) Extend the IORT iort_node_map_rid() to work on a type mask instead of a single type so that the translation API can be used on a range of components. PATCH (13) provides IORT infrastructure to carry out IOMMU configuration for devices and hook it up to the previously introduced ACPI DMA configure API. This patchset is built on top and depends on these three patch series: [1] R.Murphy "Generic DT bindings for PCI and ARM SMMU v3" v4 https://marc.info/?l=devicetree&m=146739193215518&w=2 [2] T.Nowicki "Introduce ACPI world to ITS irqchip" v7 https://marc.info/?l=linux-arm-kernel&m=146642080022289&w=2 [3] T.Nowicki "Support for ARM64 ACPI based PCI host controller" v8 http://marc.info/?l=linux-acpi&m=146462129816292&w=2 and is provided for early review/testing purposes here: git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git acpi/iort-smmu-v3 Tested on FVP models for ARM SMMU v3 probing path. Lorenzo Pieralisi (13): drivers: iommu: add FWNODE_IOMMU fwnode type drivers: acpi: iort: introduce linker section for IORT entries probing drivers: acpi: iort: add support for IOMMU fwnode registration drivers: platform: add fwnode base platform devices retrieval drivers: iommu: make iommu_fwspec OF agnostic drivers: acpi: implement acpi_dma_configure drivers: acpi: iort: add node match function drivers: acpi: iort: add support for ARM SMMU platform devices creation drivers: iommu: arm-smmu-v3: split probe functions into DT/generic portions drivers: iommu: arm-smmu-v3: enable ACPI driver initialization drivers: iommu: arm-smmu-v3: add IORT platform device creation drivers: acpi: iort: replace rid map type with type mask drivers: acpi: iort: introduce iort_iommu_configure drivers/acpi/glue.c | 4 +- drivers/acpi/iort.c | 360 +++++++++++++++++++++++++++++++++++++- drivers/acpi/scan.c | 29 +++ drivers/base/platform.c | 23 +++ drivers/iommu/Kconfig | 4 + drivers/iommu/Makefile | 1 + drivers/iommu/arm-smmu-v3.c | 147 ++++++++++++++-- drivers/iommu/iommu-fwspec.c | 114 ++++++++++++ drivers/iommu/of_iommu.c | 52 ------ drivers/pci/probe.c | 3 +- include/acpi/acpi_bus.h | 2 + include/asm-generic/vmlinux.lds.h | 1 + include/linux/acpi.h | 5 + include/linux/fwnode.h | 1 + include/linux/iommu-fwspec.h | 60 +++++++ include/linux/iommu.h | 25 +++ include/linux/iort.h | 19 ++ include/linux/of_iommu.h | 24 +-- include/linux/platform_device.h | 3 + 19 files changed, 782 insertions(+), 95 deletions(-) create mode 100644 drivers/iommu/iommu-fwspec.c create mode 100644 include/linux/iommu-fwspec.h -- 2.6.4 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
