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Date:   Mon, 18 Jan 2021 10:44:01 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Shawn Lin <shawn.lin@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Vidya Sagar <vidyas@...dia.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Minghuan Lian <minghuan.Lian@....com>,
        Mingkai Hu <mingkai.hu@....com>, Roy Zang <roy.zang@....com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Arnd Bergmann <arnd@...db.de>, Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Tom Joseph <tjoseph@...ence.com>,
        Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-ntb@...glegroups.com>
Subject: Re: [PATCH v9 00/17] Implement NTB Controller using multiple PCI EP

Hi,

On 04/01/21 9:16 pm, Kishon Vijay Abraham I wrote:
> +MAINTAINERS for platforms supporting PCIe EP mode
> 
> Hi All,
> 
> I've looped you in since the platform you maintain supports PCIe EP
> mode. This series builds NTB functionality on top of PCIe endpoint
> framework. For NTB functionality it needs atleast two endpoint
> instances. I'm trying to see if someone can help me test this series in
> any of the platforms you support.
> 
> Even if your platform cannot enable NTB, if you can just apply this
> patch series and test pci_epf_test that would be very much helpful.
> 
> Thanks in advance for your help.

Gentle ping for providing your "Reviewed-by" and "Tested-by".

Thank You,
Kishon

> 
> Best Regards,
> Kishon
> 
> On 04/01/21 8:58 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 was presented in Linux Plumbers Conference. Link to presentation
>> and video can be found @ [1]
>> Created a video demo @ [9]
>>
>> 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]
>> v7 patch series can be found @ [10]
>> v8 patch series can be found @ [11]
>>
>> Changes from v8:
>> 1) Do not use devm_request_irq/devm_free_irq as pci_free_irq_vectors()
>> has to be used after free_irq
>> 2) Drop "NTB: tool: Enable the NTB/PCIe link on the local or remote side
>> of bridge" as there is a debugfs entry to enable the link
>>  
>> Changes from v7:
>> 1) Used values stored in ctrl_reg_bar, peer_spad_reg_bar and db_reg_bar
>>    instead of hardcoded values in pci_iomap of ntb_hw_epf.c driver
>>
>> 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@...radead.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-kishon@ti.com
>> [3] -> http://lore.kernel.org/r/20200514145927.17555-1-kishon@ti.com
>> [4] -> http://lore.kernel.org/r/20200611130525.22746-1-kishon@ti.com
>> [5] -> http://lore.kernel.org/r/20200904075052.8911-1-kishon@ti.com
>> [6] -> http://lore.kernel.org/r/20200915042110.3015-1-kishon@ti.com
>> [7] -> http://lore.kernel.org/r/20200918064227.1463-1-kishon@ti.com
>> [8] -> http://lore.kernel.org/r/20200924092519.17082-1-kishon@ti.com
>> [9] -> https://youtu.be/dLKKxrg5-rY
>> [10] -> http://lore.kernel.org/r/20200930153519.7282-1-kishon@ti.com 
>> [11] -> http://lore.kernel.org/r/20201111153559.19050-1-kishon@ti.com
>>
>> Kishon Vijay Abraham I (17):
>>   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
>>   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               |  754 ++++++
>>  .../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 +
>>  22 files changed, 3932 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
>>

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