Introduces AMD CDX bus, which provides a mechanism to discover/rescan CDX devices. The CDX devices are memory mapped on system bus for embedded CPUs. CDX controller interacts with the firmware to query different CDX devices present in the Fabric and expose them to the Linux host on CDX bus. This patch series: - Introduces the CDX bus and CDX devices. - Device tree binding for CDX controller - Support for CDX bus in arm-smmu-v3 driver - Add MCDI (Management CPU Driver Interface) as a protocol for communication with RPU Firmware - Support RPMSg channel for Firmware communication After RFC v4 we sent out v1 (non-RFC) which was meant to be v5. This non-RFC patch is at: https://lore.kernel.org/lkml/20230117134139.1298-8-nipun.gupta@xxxxxxx/T/ Sending this series as a v6 now. Changes v5 -> v6 - updated compatible name in the CDX dt-binding - updated reset CDX device and removed redundant function - moved from drivers/bus/cdx to drivers/cdx - used xarray instead of controller list and ID - updated sysfs documentation with more details Changes RFC v4 -> v5 - Fixed device tree documentation - Add MCDI as a protocol and RPMsg as transport for communication with RPU Firmware instead of using MCDI stubs. - MSI patches for CDX are not added in this series as it's support is being revisited as per patch series: https://lore.kernel.org/all/20221111133158.196269823@xxxxxxxxxxxxx/ It will be added as separate patches. Changes RFC v3 -> RFC 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) Changes RFC v2 -> RFC 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 RFC v1 -> RFC 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 Abhijit Gangurde (1): cdx: add rpmsg communication channel for CDX Nipun Gupta (6): cdx: add the cdx bus driver iommu/arm-smmu-v3: support ops registration for CDX bus dt-bindings: bus: add CDX bus controller for versal net cdx: add MCDI protocol interface for firmware interaction cdx: add cdx controller cdx: add device attributes Documentation/ABI/testing/sysfs-bus-cdx | 79 ++ .../bindings/bus/xlnx,versal-net-cdx.yaml | 68 ++ MAINTAINERS | 8 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/cdx/Kconfig | 18 + drivers/cdx/Makefile | 8 + drivers/cdx/cdx.c | 553 +++++++++++ drivers/cdx/cdx.h | 62 ++ drivers/cdx/controller/Kconfig | 30 + drivers/cdx/controller/Makefile | 9 + drivers/cdx/controller/bitfield.h | 88 ++ drivers/cdx/controller/cdx_controller.c | 229 +++++ drivers/cdx/controller/cdx_controller.h | 30 + drivers/cdx/controller/cdx_rpmsg.c | 202 ++++ drivers/cdx/controller/mc_cdx_pcol.h | 590 +++++++++++ drivers/cdx/controller/mcdi.c | 913 ++++++++++++++++++ drivers/cdx/controller/mcdi.h | 247 +++++ drivers/cdx/controller/mcdi_functions.c | 139 +++ drivers/cdx/controller/mcdi_functions.h | 61 ++ drivers/iommu/iommu.c | 4 + include/linux/cdx/cdx_bus.h | 174 ++++ include/linux/mod_devicetable.h | 15 + scripts/mod/devicetable-offsets.c | 4 + scripts/mod/file2alias.c | 12 + 25 files changed, 3546 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-cdx create mode 100644 Documentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml create mode 100644 drivers/cdx/Kconfig create mode 100644 drivers/cdx/Makefile create mode 100644 drivers/cdx/cdx.c create mode 100644 drivers/cdx/cdx.h create mode 100644 drivers/cdx/controller/Kconfig create mode 100644 drivers/cdx/controller/Makefile create mode 100644 drivers/cdx/controller/bitfield.h create mode 100644 drivers/cdx/controller/cdx_controller.c create mode 100644 drivers/cdx/controller/cdx_controller.h create mode 100644 drivers/cdx/controller/cdx_rpmsg.c create mode 100644 drivers/cdx/controller/mc_cdx_pcol.h create mode 100644 drivers/cdx/controller/mcdi.c create mode 100644 drivers/cdx/controller/mcdi.h create mode 100644 drivers/cdx/controller/mcdi_functions.c create mode 100644 drivers/cdx/controller/mcdi_functions.h create mode 100644 include/linux/cdx/cdx_bus.h -- 2.17.1
