[PATCH v14 00/20] VFIO support for platform devices

Baptiste Reynal
2015-03-02T16:59:40Z

This patch series aims to implement VFIO support for platform devices that
reside behind an IOMMU. Examples of such devices are devices behind an ARM
SMMU, or behind a Samsung Exynos System MMU.

The API used is based on the existing VFIO API that is also used with PCI
devices. Only devices that include a basic set of IRQs and memory regions are
targeted; devices with complex relationships with other devices on a device
tree are not taken into account at this stage.

This patch series may be applied on the following series/patches:
- [PATCH 1/1] iommu/arm-smmu: fix ARM_SMMU_FEAT_TRANS_OPS condition
- [PATCH v4 0/6] vfio: type1: support for ARM SMMUS with VFIO_IOMMU_TYPE1

A copy can be cloned from the branch vfio-platform-v14 at:
https://github.com/virtualopensystems/linux-kvm-arm.git

This serie has been tested on a DMA PL330 with ARM FastModels.

Changes since v13:
- Rebased on linux v4.0-rc1
- Re-added support for ARM AMBA devices
- Baptiste Reynal is the new maintainer of this serie
Changes since v12:
- Reorder chunks to be bisect-able
Changes since v11:
- Drop support for ARM AMBA devices
- vfio_platform_private.h is now self-contained
- Fix masked IRQ initialization
Changes since v10:
- Check if interrupt is already masked when setting a new trigger
- Fixed kasprintf with unchecked return value in VFIO AMBA driver
Changes since v9:
- Reworked the splitting of the patches that decouple virqfd from PCI
- Some styling issues and typos
- Removed superfluous includes
- AMBA devices are now named vfio-amba- suffixed by the AMBA device id
- Several other cleanups and fixes
Changes since v8:
- Separate irq handler for edge and level triggered interrupts
- Mutex based lock for VFIO fd open/release
- Fixed bug where the first region of a platform device wasn't exposed
- Read only regions can be MMAPed only read only
- Code cleanups
Changes since v7:
- Some initial placeholder functionality for PIO resources
- Cleaned up code for IRQ triggering, masking and unmasking
- Some functionality has been removed from this series and posted separately:
- VFIO_IOMMU_TYPE1 support for ARM SMMUs
- IOMMU NOEXEC patches
- driver_override functionality for AMBA devices
- Several fixes
Changes since v6:
- Integrated support for AMBA devices
- Numerous cleanups and fixes
Changes since v5:
- Full eventfd support for IRQ masking and unmasking.
- Changed IOMMU_EXEC to IOMMU_NOEXEC, along with related flags in VFIO.
- Other fixes based on reviewer comments.
Changes since v4:
- Use static offsets for each region in the VFIO device fd
- Include patch in the series for the ARM SMMU to expose IOMMU_EXEC
availability via IOMMU_CAP_DMA_EXEC
- Rebased on VFIO multi domain support:
- IOMMU_EXEC is now available if at least one IOMMU in the container
supports it
- Expose IOMMU_EXEC if available via the capability VFIO_IOMMU_PROT_EXEC
- Some bug fixes
Changes since v3:
- Use Kim Phillips' driver_probe_device()
Changes since v2:
- Fixed Read/Write and MMAP on device regions
- Removed dependency on Device Tree
- Interrupts support
- Interrupt masking/unmasking
- Automask level sensitive interrupts
- Introduced VFIO_DMA_MAP_FLAG_EXEC
- Code clean ups

Antonios Motakis (20):
vfio/platform: initial skeleton of VFIO support for platform devices
vfio: platform: probe to devices on the platform bus
vfio: platform: add the VFIO PLATFORM module to Kconfig
vfio: amba: VFIO support for AMBA devices
vfio: amba: add the VFIO for AMBA devices module to Kconfig
vfio/platform: return info for bound device
vfio/platform: return info for device memory mapped IO regions
vfio/platform: read and write support for the device fd
vfio/platform: support MMAP of MMIO regions
vfio/platform: return IRQ info
vfio/platform: initial interrupts support code
vfio/platform: trigger an interrupt via eventfd
vfio/platform: support for level sensitive interrupts
vfio: add a vfio_ prefix to virqfd_enable and virqfd_disable and
export
vfio: virqfd: rename vfio_pci_virqfd_init and vfio_pci_virqfd_exit
vfio: add local lock for virqfd instead of depending on VFIO PCI
vfio: pass an opaque pointer on virqfd initialization
vfio: move eventfd support code for VFIO_PCI to a separate file
vfio: initialize the virqfd workqueue in VFIO generic code
vfio/platform: implement IRQ masking/unmasking via an eventfd

drivers/vfio/Kconfig | 1 +
drivers/vfio/Makefile | 5 +-
drivers/vfio/pci/vfio_pci.c | 8 -
drivers/vfio/pci/vfio_pci_intrs.c | 238 +-----------
drivers/vfio/pci/vfio_pci_private.h | 3 -
drivers/vfio/platform/Kconfig | 19 +
drivers/vfio/platform/Makefile | 8 +
drivers/vfio/platform/vfio_amba.c | 115 ++++++
drivers/vfio/platform/vfio_platform.c | 103 +++++
drivers/vfio/platform/vfio_platform_common.c | 521 ++++++++++++++++++++++++++
drivers/vfio/platform/vfio_platform_irq.c | 336 +++++++++++++++++
drivers/vfio/platform/vfio_platform_private.h | 85 +++++
drivers/vfio/vfio.c | 8 +
drivers/vfio/virqfd.c | 213 +++++++++++
include/linux/vfio.h | 27 ++
include/uapi/linux/vfio.h | 2 +
16 files changed, 1456 insertions(+), 236 deletions(-)
create mode 100644 drivers/vfio/platform/Kconfig
create mode 100644 drivers/vfio/platform/Makefile
create mode 100644 drivers/vfio/platform/vfio_amba.c
create mode 100644 drivers/vfio/platform/vfio_platform.c
create mode 100644 drivers/vfio/platform/vfio_platform_common.c
create mode 100644 drivers/vfio/platform/vfio_platform_irq.c
create mode 100644 drivers/vfio/platform/vfio_platform_private.h
create mode 100644 drivers/vfio/virqfd.c

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2.3.1