[RFC PATCH v3 00/13] ACPI IORT ARM SMMU v3 support
Dennis Chen
dennis.chen at arm.com
Sun Jul 24 22:53:32 PDT 2016
Hi
On Wed, Jul 20, 2016 at 12:23:22PM +0100, Lorenzo Pieralisi wrote:
> 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-v3i
>
I thought I can got all the 13 patches applied with the above git tree, but I can't find
any ACPI related stuff after I cloned the git repos to my local machine, am I missing
something here?
Thanks,
Dennis
>
> 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
>
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