This patch series introduces AMD CDX bus, which provides a mechanism to discover/rescan FPGA devices on run-time. These devices are memory mapped on system bus for embedded CPUs, and added as CDX devices in Linux framework. This RFC: - Intrduces the CDX bus controller and CDX devices. - Adds rescan and reset support for the CDX bus. - Add support for reset for CDX devices. - Support for CDX bus in arm-smmu-v3 driver - Support for CDX-MSI domain. Please NOTE: This RFC change does not support the CDX bus firmware interface as it is under development, and this series aims to get an early feedback from the community. Firmware interaction are stubbed as MCDI APIs which is a protocol used by AMD to interact with Firmware. Changes in v2: - introduce CDX bus infrastructure - fixed code for making compatible visible for devices having the 'compatible' property only (Greg K-H) - moved CDX-MSI domain as part of CDX bus infrastructure. previously it was part of irqchip (Marc Zynger). - fixed few prints (Greg K-H) - support rescan and reset of CDX bus - add VFIO reset module for CDX bus based devices Changes in v3: - Move CDX bus as a new bus type in kernel rather than using the platform devices (Greg K-H, Marc Zynger) - Correspondingly update ARM SMMU v3 - Add support for vfio-cdx driver - Updated device tree yaml with correct binding information (Krzysztof Kozlowski) - remove 'compatible' sysfs platform patch which was required for CDX devices exposed as platform devices Changes in v4: - Separate CDX bus and CDX controller driver (Greg K-H) - Added MSI interfacing to Firmware for writing MSI message to firmware so it can be provided to the device. - Fix MSI review comments - multiple cleanups (Mark Zynger) - Fix the device tree yaml compilation (Rob Herring, Krzysztof) - removed vfio-cdx from this series. It will be added after bus support is complete (Jason) Nipun Gupta (8): dt-bindings: bus: add CDX bus device tree bindings bus/cdx: add the cdx bus driver iommu/arm-smmu-v3: support ops registration for CDX bus bux/cdx: support dma configuration for CDX devices bus/cdx: add bus and device attributes irq/msi: use implicit msi domain for alloc and free bus/cdx: add cdx-MSI domain with gic-its domain as parent bus/cdx: add cdx controller .../devicetree/bindings/bus/xlnx,cdx.yaml | 66 +++ MAINTAINERS | 8 + drivers/base/platform-msi.c | 4 +- drivers/bus/Kconfig | 1 + drivers/bus/Makefile | 3 + drivers/bus/cdx/Kconfig | 17 + drivers/bus/cdx/Makefile | 8 + drivers/bus/cdx/cdx.c | 557 ++++++++++++++++++ drivers/bus/cdx/cdx.h | 76 +++ drivers/bus/cdx/cdx_msi.c | 161 +++++ drivers/bus/cdx/controller/Kconfig | 16 + drivers/bus/cdx/controller/Makefile | 8 + drivers/bus/cdx/controller/cdx_controller.c | 210 +++++++ drivers/bus/cdx/controller/mcdi_stubs.c | 68 +++ drivers/bus/cdx/controller/mcdi_stubs.h | 101 ++++ drivers/bus/fsl-mc/fsl-mc-msi.c | 4 +- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 16 +- drivers/pci/msi/irqdomain.c | 4 +- drivers/soc/ti/ti_sci_inta_msi.c | 2 +- include/linux/cdx/cdx_bus.h | 165 ++++++ include/linux/mod_devicetable.h | 13 + include/linux/msi.h | 10 +- kernel/irq/msi.c | 22 +- scripts/mod/devicetable-offsets.c | 4 + scripts/mod/file2alias.c | 12 + 25 files changed, 1529 insertions(+), 27 deletions(-) create mode 100644 Documentation/devicetree/bindings/bus/xlnx,cdx.yaml create mode 100644 drivers/bus/cdx/Kconfig create mode 100644 drivers/bus/cdx/Makefile create mode 100644 drivers/bus/cdx/cdx.c create mode 100644 drivers/bus/cdx/cdx.h create mode 100644 drivers/bus/cdx/cdx_msi.c create mode 100644 drivers/bus/cdx/controller/Kconfig create mode 100644 drivers/bus/cdx/controller/Makefile create mode 100644 drivers/bus/cdx/controller/cdx_controller.c create mode 100644 drivers/bus/cdx/controller/mcdi_stubs.c create mode 100644 drivers/bus/cdx/controller/mcdi_stubs.h create mode 100644 include/linux/cdx/cdx_bus.h -- 2.25.1
