[RFC PATCH v3 00/13] ACPI IORT ARM SMMU v3 support
From: Lorenzo Pieralisi
Date: Wed Jul 20 2016 - 07:23:55 EST
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
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2.6.4