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 should be applied at least on the following series/patches:
- [PATCH 0/3] iommu: replace IOMMU_EXEC with IOMMU_EXEC and update ARM SMMU driver
- [PATCH] driver core: amba: add device binding path 'driver_override'
- [PATCH v2 0/6] vfio: type1: support for ARM SMMUS with VFIO_IOMMU_TYPE1
A copy can be cloned from the branch vfio-platform-v9 at:
git@xxxxxxxxxx:virtualopensystems/linux-kvm-arm.git
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 (19):
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: move eventfd support code for VFIO_PCI to a separate file
vfio: add local lock in virqfd instead of depending on VFIO PCI
vfio: pass an opaque pointer on virqfd initialization
vfio: virqfd: add vfio_ prefix to virqfd_enable and virqfd_disable
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 | 116 ++++++
drivers/vfio/platform/vfio_platform.c | 114 ++++++
drivers/vfio/platform/vfio_platform_common.c | 529 ++++++++++++++++++++++++++
drivers/vfio/platform/vfio_platform_irq.c | 337 ++++++++++++++++
drivers/vfio/platform/vfio_platform_private.h | 81 ++++
drivers/vfio/vfio.c | 8 +
drivers/vfio/virqfd.c | 215 +++++++++++
include/linux/vfio.h | 27 ++
include/uapi/linux/vfio.h | 2 +
16 files changed, 1475 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
--
2.1.1
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