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From: Randy Dunlap <rdunlap@infradead.org>
To: mgross@linux.intel.com, markgross@kernel.org, arnd@arndb.de,
	bp@suse.de, damien.lemoal@wdc.com, dragan.cvetic@xilinx.com,
	gregkh@linuxfoundation.org, corbet@lwn.net,
	leonard.crestez@nxp.com, palmerdabbelt@google.com,
	paul.walmsley@sifive.com, peng.fan@nxp.com, robh+dt@kernel.org,
	shawnguo@kernel.org, jassisinghbrar@gmail.com
Cc: linux-kernel@vger.kernel.org,
	Srikanth Thokala <srikanth.thokala@intel.com>,
	linux-doc@vger.kernel.org
Subject: Re: [PATCH v2 08/34] misc: xlink-pcie: Add documentation for XLink PCIe driver
Date: Tue, 19 Jan 2021 11:36:20 -0800
Message-ID: <0e68a2f9-f02d-c777-d9b8-b1ad13555ab3@infradead.org> (raw)
In-Reply-To: <20210108212600.36850-9-mgross@linux.intel.com>

Hi,
Here are a few doc comments for you:

On 1/8/21 1:25 PM, mgross@linux.intel.com wrote:
> From: Srikanth Thokala <srikanth.thokala@intel.com>
> 
> Provide overview of XLink PCIe driver implementation
> 
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: linux-doc@vger.kernel.org
> Reviewed-by: Mark Gross <mgross@linux.intel.com>
> Signed-off-by: Srikanth Thokala <srikanth.thokala@intel.com>
> ---
>  Documentation/vpu/index.rst      |  1 +
>  Documentation/vpu/xlink-pcie.rst | 90 ++++++++++++++++++++++++++++++++
>  2 files changed, 91 insertions(+)
>  create mode 100644 Documentation/vpu/xlink-pcie.rst
> 

> diff --git a/Documentation/vpu/xlink-pcie.rst b/Documentation/vpu/xlink-pcie.rst
> new file mode 100644
> index 000000000000..2d877c966b1e
> --- /dev/null
> +++ b/Documentation/vpu/xlink-pcie.rst
> @@ -0,0 +1,90 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +================================
> +Kernel driver: Xlink-pcie driver
> +================================
> +Supported chips:
> +  * Intel Edge.AI Computer Vision platforms: Keem Bay
> +    Suffix: Bay
> +    Slave address: 6240
> +    Datasheet: Publicly available at Intel
> +
> +Author: Srikanth Thokala Srikanth.Thokala@intel.com
> +
> +Introduction
> +============
> +The Xlink-pcie driver provides transport layer implementation for
> +the data transfers to support Xlink protocol subsystem communication with the
> +peer device. i.e, between remote host system and Keem Bay device.

        device, i.e.,

> +
> +The Keem Bay device is an ARM-based SOC that includes a vision processing
> +unit (VPU) and deep learning, neural network core in the hardware.
> +The Xlink-pcie driver exports a functional device endpoint to the Keem Bay
> +device and supports two-way communication with the peer device.
> +
> +High-level architecture
> +=======================
> +Remote Host: IA CPU
> +Local Host: ARM CPU (Keem Bay)::
> +
> +        +------------------------------------------------------------------------+
> +        |  Remote Host IA CPU              | | Local Host ARM CPU (Keem Bay) |   |
> +        +==================================+=+===============================+===+
> +        |  User App                        | | User App                      |   |
> +        +----------------------------------+-+-------------------------------+---+
> +        |   XLink UAPI                     | | XLink UAPI                    |   |
> +        +----------------------------------+-+-------------------------------+---+
> +        |   XLink Core                     | | XLink Core                    |   |
> +        +----------------------------------+-+-------------------------------+---+
> +        |   XLink PCIe                     | | XLink PCIe                    |   |
> +        +----------------------------------+-+-------------------------------+---+
> +        |   XLink-PCIe Remote Host driver  | | XLink-PCIe Local Host driver  |   |
> +        +----------------------------------+-+-------------------------------+---+
> +        |-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:|:|:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:|
> +        +----------------------------------+-+-------------------------------+---+
> +        |     PCIe Host Controller         | | PCIe Device Controller        | HW|
> +        +----------------------------------+-+-------------------------------+---+
> +               ^                                             ^
> +               |                                             |
> +               |------------- PCIe x2 Link  -----------------|
> +
> +This XLink PCIe driver comprises of two variants:
> +* Local Host driver
> +
> +  * Intended for ARM CPU
> +  * It is based on PCI Endpoint Framework
> +  * Driver path: {tree}/drivers/misc/Xlink-pcie/local_host
> +
> +* Remote Host driver
> +
> +       * Intended for IA CPU
> +       * It is a PCIe endpoint driver
> +       * Driver path: {tree}/drivers/misc/Xlink-pcie/remote_host
> +
> +XLink PCIe communication between local host and remote host is achieved through
> +ring buffer management and MSI/Doorbell interrupts.
> +
> +The Xlink-pcie driver subsystem registers the Keem Bay device as an endpoint
> +driver and provides standard linux PCIe sysfs interface, #

                                Linux
What is the '#' sign for above?

> +/sys/bus/pci/devices/xxxx:xx:xx.0/
> +
> +
> +XLink protocol subsystem
> +========================
> +Xlink is an abstracted control and communication subsystem based on channel
> +identification. It is intended to support VPU technology both at SoC level as
> +well as at IP level, over multiple interfaces.
> +
> +- The Xlink subsystem abstracts several types of communication channels
> +  underneath, allowing the usage of different interfaces with the
> +  same function call interface.
> +- The Communication channels are full-duplex protocol channels allowing
> +  concurrent bidirectional communication.
> +- The Xlink subsystem also supports control operations to VPU either
> +  from standalone local system or from remote system based on communication
> +  interface underneath.
> +- The Xlink subsystem supports the following communication interfaces:
> +    * USB CDC
> +    * Gigabit Ethernet
> +    * PCIe
> +    * IPC
> 


-- 
~Randy
"He closes his eyes and drops the goggles.  You can't get hurt
by looking at a bitmap.  Or can you?"
(Neal Stephenson: Snow Crash)

  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-08 21:25 [PATCH v2 00/34] Intel Vision Processing base enabling mgross
2021-01-08 21:25 ` [PATCH v2 01/34] Add Vision Processing Unit (VPU) documentation mgross
2021-01-08 21:25 ` [PATCH v2 02/34] dt-bindings: mailbox: Add Intel VPU IPC mailbox bindings mgross
2021-01-08 21:25 ` [PATCH v2 03/34] mailbox: vpu-ipc-mailbox: Add support for Intel VPU IPC mailbox mgross
2021-01-08 21:25 ` [PATCH v2 04/34] dt-bindings: Add bindings for Keem Bay IPC driver mgross
2021-01-08 21:25 ` [PATCH v2 05/34] keembay-ipc: Add Keem Bay IPC module mgross
2021-01-08 21:25 ` [PATCH v2 06/34] dt-bindings: Add bindings for Keem Bay VPU IPC driver mgross
2021-01-10 17:18   ` Rob Herring
2021-01-11 19:24   ` Rob Herring
2021-01-19 14:32     ` Alessandrelli, Daniele
2021-01-08 21:25 ` [PATCH v2 07/34] keembay-vpu-ipc: Add Keem Bay VPU IPC module mgross
2021-01-08 21:25 ` [PATCH v2 08/34] misc: xlink-pcie: Add documentation for XLink PCIe driver mgross
2021-01-19 19:36   ` Randy Dunlap [this message]
2021-01-24 18:27     ` Thokala, Srikanth
2021-01-08 21:25 ` [PATCH v2 09/34] misc: xlink-pcie: lh: Add PCIe EPF driver for Local Host mgross
2021-01-20 17:57   ` Greg KH
2021-01-24 11:48     ` Thokala, Srikanth
2021-01-24 11:56       ` Greg KH
2021-01-24 18:18         ` Thokala, Srikanth
2021-01-08 21:25 ` [PATCH v2 10/34] misc: xlink-pcie: lh: Add PCIe EP DMA functionality mgross
2021-01-08 21:25 ` [PATCH v2 11/34] misc: xlink-pcie: lh: Add core communication logic mgross
2021-01-08 21:25 ` [PATCH v2 12/34] misc: xlink-pcie: lh: Prepare changes for adding remote host driver mgross
2021-01-08 21:25 ` [PATCH v2 13/34] misc: xlink-pcie: rh: Add PCIe EP driver for Remote Host mgross
2021-01-08 21:25 ` [PATCH v2 14/34] misc: xlink-pcie: rh: Add core communication logic mgross
2021-01-08 21:25 ` [PATCH v2 15/34] misc: xlink-pcie: Add XLink API interface mgross
2021-01-20 17:59   ` Greg KH
2021-01-21 23:20     ` mark gross
2021-01-24 11:46     ` Thokala, Srikanth
2021-01-08 21:25 ` [PATCH v2 16/34] misc: xlink-pcie: Add asynchronous event notification support for XLink mgross
2021-01-08 21:25 ` [PATCH v2 17/34] xlink-ipc: Add xlink ipc device tree bindings mgross
2021-01-10 17:18   ` Rob Herring
2021-01-08 21:25 ` [PATCH v2 18/34] xlink-ipc: Add xlink ipc driver mgross
2021-01-08 21:25 ` [PATCH v2 19/34] xlink-core: Add xlink core device tree bindings mgross
2021-01-10 17:18   ` Rob Herring
2021-01-11 19:27   ` Rob Herring
2021-01-08 21:25 ` [PATCH v2 20/34] xlink-core: Add xlink core driver xLink mgross
2021-01-19 19:58   ` Randy Dunlap
2021-01-08 21:25 ` [PATCH v2 21/34] xlink-core: Enable xlink protocol over pcie mgross
2021-01-08 21:25 ` [PATCH v2 22/34] xlink-core: Enable VPU IP management and runtime control mgross
2021-01-08 21:25 ` [PATCH v2 23/34] xlink-core: add async channel and events mgross
2021-01-08 21:25 ` [PATCH v2 24/34] dt-bindings: misc: Add Keem Bay vpumgr mgross
2021-01-08 21:25 ` [PATCH v2 25/34] misc: Add Keem Bay VPU manager mgross
2021-01-08 21:25 ` [PATCH v2 26/34] dt-bindings: misc: intel_tsens: Add tsens thermal bindings documentation mgross
2021-01-08 21:25 ` [PATCH v2 27/34] misc: Tsens ARM host thermal driver mgross
2021-01-08 21:25 ` [PATCH v2 28/34] misc: Intel tsens IA host driver mgross
2021-01-08 21:25 ` [PATCH v2 29/34] Intel tsens i2c slave driver mgross
2021-01-12  7:15   ` Randy Dunlap
2021-01-25 23:39     ` mark gross
2021-01-26  7:45       ` Arnd Bergmann
2021-01-26 14:56         ` Gross, Mark
2021-01-27  4:45         ` C, Udhayakumar
2021-01-27  4:44       ` C, Udhayakumar
2021-01-08 21:25 ` [PATCH v2 30/34] misc:intel_tsens: Intel Keem Bay tsens driver mgross
2021-01-08 21:25 ` [PATCH v2 31/34] Intel Keem Bay XLink SMBus driver mgross
2021-01-08 21:25 ` [PATCH v2 32/34] dt-bindings: misc: hddl_dev: Add hddl device management documentation mgross
2021-01-08 21:25 ` [PATCH v2 33/34] misc: Hddl device management for local host mgross
2021-01-08 21:26 ` [PATCH v2 34/34] misc: HDDL device management for IA host mgross

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