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

[Baptiste Reynal <b.reynal-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>]

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

-- 
2.3.1