This series is about implementing SW defined Non-Transparent Bridge (NTB) using multiple endpoint (EP) instances. This series has been tested using 2 endpoint instances in J7 connected to J7 board on one end and DRA7 board on the other end. However there is nothing platform specific for the NTB functionality.
This was presented in Linux Plumbers Conference. Link to presentation and video can be found @ [1] RFC patch series can be found @ [2] v1 patch series can be found @ [3] v2 patch series can be found @ [4] v3 patch series can be found @ [5] v4 patch series can be found @ [6] v5 patch series can be found @ [7] v6 patch series can be found @ [8] Changes from v6: 1) Fixed issues when multiple NTB devices are creating using multiple functions 2) Fixed issue with writing scratchpad register 3) Created a video demo @ [9] Changes from v5: 1) Fixed a formatting issue in Kconfig pointed out by Randy 2) Checked for Error or Null in pci_epc_add_epf() Changes from v4: 1) Fixed error condition checks in pci_epc_add_epf() Changes from v3: 1) Fixed Documentation edits suggested by Randy Dunlap <rdun...@infradead.org> Changes from v2: 1) Add support for the user to create sub-directory of 'EPF Device' directory (for endpoint function specific configuration using configfs). 2) Add documentation for NTB specific attributes in configfs 3) Check for PCI_CLASS_MEMORY_RAM (PCIe class) before binding ntb_hw_epf driver 4) Other documentation fixes Changes from v1: 1) As per Rob's comment, removed support for creating NTB function device from DT 2) Add support to create NTB EPF device using configfs (added support in configfs to associate primary and secondary EPC with EPF. Changes from RFC: 1) Converted the DT binding patches to YAML schema and merged the DT binding patches together 2) NTB documentation is converted to .rst 3) One HOST can now interrupt the other HOST using MSI-X interrupts 4) Added support for teardown of memory window and doorbell configuration 5) Add support to provide support 64-bit memory window size from DT [1] -> https://linuxplumbersconf.org/event/4/contributions/395/ [2] -> http://lore.kernel.org/r/20190926112933.8922-1-kis...@ti.com [3] -> http://lore.kernel.org/r/20200514145927.17555-1-kis...@ti.com [4] -> http://lore.kernel.org/r/20200611130525.22746-1-kis...@ti.com [5] -> http://lore.kernel.org/r/20200904075052.8911-1-kis...@ti.com [6] -> http://lore.kernel.org/r/20200915042110.3015-1-kis...@ti.com [7] -> http://lore.kernel.org/r/20200918064227.1463-1-kis...@ti.com [8] -> http://lore.kernel.org/r/20200924092519.17082-1-kis...@ti.com [9] -> https://youtu.be/dLKKxrg5-rY Kishon Vijay Abraham I (18): Documentation: PCI: Add specification for the *PCI NTB* function device PCI: endpoint: Make *_get_first_free_bar() take into account 64 bit BAR PCI: endpoint: Add helper API to get the 'next' unreserved BAR PCI: endpoint: Make *_free_bar() to return error codes on failure PCI: endpoint: Remove unused pci_epf_match_device() PCI: endpoint: Add support to associate secondary EPC with EPF PCI: endpoint: Add support in configfs to associate two EPCs with EPF PCI: endpoint: Add pci_epc_ops to map MSI irq PCI: endpoint: Add pci_epf_ops for epf drivers to expose function specific attrs PCI: endpoint: Allow user to create sub-directory of 'EPF Device' directory PCI: cadence: Implement ->msi_map_irq() ops PCI: cadence: Configure LM_EP_FUNC_CFG based on epc->function_num_map PCI: endpoint: Add EP function driver to provide NTB functionality PCI: Add TI J721E device to pci ids NTB: Add support for EPF PCI-Express Non-Transparent Bridge NTB: tool: Enable the NTB/PCIe link on the local or remote side of bridge Documentation: PCI: Add configfs binding documentation for pci-ntb endpoint function Documentation: PCI: Add userguide for PCI endpoint NTB function .../PCI/endpoint/function/binding/pci-ntb.rst | 38 + Documentation/PCI/endpoint/index.rst | 3 + .../PCI/endpoint/pci-endpoint-cfs.rst | 10 + .../PCI/endpoint/pci-ntb-function.rst | 351 +++ Documentation/PCI/endpoint/pci-ntb-howto.rst | 160 ++ drivers/misc/pci_endpoint_test.c | 1 - drivers/ntb/hw/Kconfig | 1 + drivers/ntb/hw/Makefile | 1 + drivers/ntb/hw/epf/Kconfig | 6 + drivers/ntb/hw/epf/Makefile | 1 + drivers/ntb/hw/epf/ntb_hw_epf.c | 755 ++++++ drivers/ntb/test/ntb_tool.c | 1 + .../pci/controller/cadence/pcie-cadence-ep.c | 60 +- drivers/pci/endpoint/functions/Kconfig | 12 + drivers/pci/endpoint/functions/Makefile | 1 + drivers/pci/endpoint/functions/pci-epf-ntb.c | 2114 +++++++++++++++++ drivers/pci/endpoint/functions/pci-epf-test.c | 13 +- drivers/pci/endpoint/pci-ep-cfs.c | 176 +- drivers/pci/endpoint/pci-epc-core.c | 130 +- drivers/pci/endpoint/pci-epf-core.c | 105 +- include/linux/pci-epc.h | 39 +- include/linux/pci-epf.h | 28 +- include/linux/pci_ids.h | 1 + 23 files changed, 3934 insertions(+), 73 deletions(-) create mode 100644 Documentation/PCI/endpoint/function/binding/pci-ntb.rst create mode 100644 Documentation/PCI/endpoint/pci-ntb-function.rst create mode 100644 Documentation/PCI/endpoint/pci-ntb-howto.rst create mode 100644 drivers/ntb/hw/epf/Kconfig create mode 100644 drivers/ntb/hw/epf/Makefile create mode 100644 drivers/ntb/hw/epf/ntb_hw_epf.c create mode 100644 drivers/pci/endpoint/functions/pci-epf-ntb.c -- 2.17.1
