Re: [PATCH v7 00/18] Implement NTB Controller using multiple PCI EP

[Kishon Vijay Abraham I]

Hi Jon Mason, Allen Hubbe, Dave Jiang,

On 30/09/20 9:05 pm, Kishon Vijay Abraham I wrote:
> 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 series has two patches that adds to drivers/ntb/ directory.
[PATCH v7 15/18] NTB: Add support for EPF PCI-Express Non-Transparent
Bridge and [PATCH v7 16/18] NTB: tool: Enable the NTB/PCIe link on the
local or remote side of bridge.

If you can review and Ack the above patches, Lorenzo can queue it along
with the rest of the series.

Thanks for your help in advance.

Best Regards,
Kishon

> 
> 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 <rdunlap@xxxxxxxxxxxxx>
> 
> 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-kishon@xxxxxx
> [3] -> http://lore.kernel.org/r/20200514145927.17555-1-kishon@xxxxxx
> [4] -> http://lore.kernel.org/r/20200611130525.22746-1-kishon@xxxxxx
> [5] -> http://lore.kernel.org/r/20200904075052.8911-1-kishon@xxxxxx
> [6] -> http://lore.kernel.org/r/20200915042110.3015-1-kishon@xxxxxx
> [7] -> http://lore.kernel.org/r/20200918064227.1463-1-kishon@xxxxxx
> [8] -> http://lore.kernel.org/r/20200924092519.17082-1-kishon@xxxxxx
> [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
>