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
Cc: linux-kernel@vger.kernel.org,
Srikanth Thokala <srikanth.thokala@intel.com>,
linux-doc@vger.kernel.org
Subject: Re: [PATCH 06/22] misc: xlink-pcie: Add documentation for XLink PCIe driver
Date: Fri, 18 Dec 2020 14:59:00 -0800 [thread overview]
Message-ID: <2fd73da0-ee89-3831-bf96-5ed130e90c4d@infradead.org> (raw)
In-Reply-To: <20201201223511.65542-7-mgross@linux.intel.com>
On 12/1/20 2:34 PM, mgross@linux.intel.com wrote:
> From: Srikanth Thokala <srikanth.thokala@intel.com>
>
> Provide overview of XLink PCIe driver implementation
>
> 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 | 91 ++++++++++++++++++++++++++++++++
> 2 files changed, 92 insertions(+)
> create mode 100644 Documentation/vpu/xlink-pcie.rst
>
Hi--
For document, chapter, section, etc., headings, please read & use
Documentation/doc-guide/sphinx.rst:
* Please stick to this order of heading adornments:
1. ``=`` with overline for document title::
==============
Document title
==============
2. ``=`` for chapters::
Chapters
========
3. ``-`` for sections::
Section
-------
4. ``~`` for subsections::
Subsection
~~~~~~~~~~
> diff --git a/Documentation/vpu/xlink-pcie.rst b/Documentation/vpu/xlink-pcie.rst
> new file mode 100644
> index 000000000000..bc64b566989d
> --- /dev/null
> +++ b/Documentation/vpu/xlink-pcie.rst
> @@ -0,0 +1,91 @@
> +.. SPDX-License-Identifier: GPL-2.0-only
> +
> +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:
No colon at end of chapter/section headings.
> +-------------
> +The xlink-pcie driver in linux-5.4 provides transport layer implementation for
Linux 5.4 (?)
> +the data transfers to support xlink protocol subsystem communication with the
Xlink
> +peer device. i.e, between remote host system and the local Keem Bay device.
device, i.e., between the remote host system and
> +
> +The Keem Bay device is an ARM based SOC that includes a vision processing
ARM-based
> +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 peer device.
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 Keem Bay device as an endpoint driver
registers the
> +and provides standard linux pcie sysfs interface, # /sys/bus/pci/devices/xxxx:xx:xx.0/
Linux PCIe
> +
> +
> +-------------------------
> +XLink protocol subsystem:
No colon at end.
> +-------------------------
> +xlink is an abstracted control and communication subsystem based on channel
Xlink
> +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
Xlink
> + 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
Xlink
> + from standalone local system or from remote system based on communication
> + interface underneath.
> +- The xlink subsystem supports following communication interfaces:
Xlink supports the following
> + * USB CDC
> + * Gigabit Ethernet
> + * PCIe
> + * IPC
>
cheers.
--
~Randy
next prev parent reply other threads:[~2020-12-18 23:00 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 22:34 [PATCH 00/22] Intel Vision Processing Unit base enabling part 1 mgross
2020-12-01 22:34 ` [PATCH 01/22] Add Vision Processing Unit (VPU) documentation mgross
2020-12-18 23:30 ` Randy Dunlap
2021-01-07 20:16 ` mark gross
2020-12-01 22:34 ` [PATCH 02/22] dt-bindings: Add bindings for Keem Bay IPC driver mgross
2020-12-07 16:01 ` Rob Herring
2020-12-07 18:22 ` mark gross
2020-12-07 18:42 ` Daniele Alessandrelli
2020-12-07 20:31 ` Jassi Brar
2020-12-09 0:12 ` mark gross
2020-12-09 16:49 ` Jassi Brar
2020-12-09 17:33 ` Rob Herring
2020-12-01 22:34 ` [PATCH 03/22] keembay-ipc: Add Keem Bay IPC module mgross
2020-12-02 6:16 ` Greg KH
2020-12-02 17:42 ` mark gross
2020-12-02 19:01 ` Greg KH
2020-12-05 3:35 ` mark gross
2020-12-05 8:40 ` Greg KH
2020-12-05 16:37 ` Gross, Mark
2020-12-07 1:36 ` mark gross
2020-12-02 6:19 ` Greg KH
2020-12-08 18:59 ` Daniele Alessandrelli
2020-12-08 19:48 ` Greg KH
2020-12-10 18:38 ` Daniele Alessandrelli
2020-12-11 8:22 ` Greg KH
2020-12-11 17:26 ` Gross, Mark
2020-12-01 22:34 ` [PATCH 04/22] dt-bindings: Add bindings for Keem Bay VPU IPC driver mgross
2020-12-07 15:57 ` Rob Herring
2020-12-07 21:28 ` mark gross
2020-12-01 22:34 ` [PATCH 05/22] keembay-vpu-ipc: Add Keem Bay VPU IPC module mgross
2020-12-01 22:34 ` [PATCH 06/22] misc: xlink-pcie: Add documentation for XLink PCIe driver mgross
2020-12-18 22:59 ` Randy Dunlap [this message]
2020-12-19 0:07 ` mark gross
2020-12-01 22:34 ` [PATCH 07/22] misc: xlink-pcie: lh: Add PCIe EPF driver for Local Host mgross
2020-12-01 22:34 ` [PATCH 08/22] misc: xlink-pcie: lh: Add PCIe EP DMA functionality mgross
2020-12-01 22:34 ` [PATCH 09/22] misc: xlink-pcie: lh: Add core communication logic mgross
2020-12-02 6:18 ` Greg KH
2020-12-02 16:46 ` Thokala, Srikanth
2020-12-01 22:34 ` [PATCH 10/22] misc: xlink-pcie: lh: Prepare changes for adding remote host driver mgross
2020-12-01 22:35 ` [PATCH 11/22] misc: xlink-pcie: rh: Add PCIe EP driver for Remote Host mgross
2020-12-01 22:35 ` [PATCH 12/22] misc: xlink-pcie: rh: Add core communication logic mgross
2020-12-01 22:35 ` [PATCH 13/22] misc: xlink-pcie: Add XLink API interface mgross
2020-12-01 22:35 ` [PATCH 14/22] misc: xlink-pcie: Add asynchronous event notification support for XLink mgross
2020-12-01 22:35 ` [PATCH 15/22] xlink-ipc: Add xlink ipc device tree bindings mgross
2020-12-07 15:58 ` Rob Herring
2020-12-07 21:41 ` mark gross
2020-12-01 22:35 ` [PATCH 16/22] xlink-ipc: Add xlink ipc driver mgross
2020-12-07 2:32 ` Joe Perches
2020-12-11 11:33 ` Kelly, Seamus
2020-12-11 12:14 ` gregkh
2020-12-11 17:12 ` Gross, Mark
2020-12-07 19:53 ` Randy Dunlap
2020-12-01 22:35 ` [PATCH 17/22] xlink-core: Add xlink core device tree bindings mgross
2020-12-07 16:02 ` Rob Herring
2020-12-01 22:35 ` [PATCH 18/22] xlink-core: Add xlink core driver xLink mgross
2020-12-07 21:50 ` Randy Dunlap
2020-12-01 22:35 ` [PATCH 19/22] xlink-core: Enable xlink protocol over pcie mgross
2020-12-01 22:35 ` [PATCH 20/22] xlink-core: Enable VPU IP management and runtime control mgross
2020-12-01 22:35 ` [PATCH 21/22] xlink-core: add async channel and events mgross
2020-12-07 2:55 ` Joe Perches
2020-12-11 11:34 ` Kelly, Seamus
2020-12-01 22:35 ` [PATCH 22/22] xlink-core: factorize xlink_ioctl function by creating sub-functions for each ioctl command mgross
2020-12-07 3:05 ` Joe Perches
2020-12-07 21:59 ` mark gross
2020-12-09 8:30 ` Joe Perches
2020-12-11 11:36 ` Kelly, Seamus
-- strict thread matches above, loose matches on Subject: below --
2020-11-30 23:06 [PATCH 00/22] Intel Vision Processing Unit base enabling part 1 mgross
2020-11-30 23:06 ` [PATCH 06/22] misc: xlink-pcie: Add documentation for XLink PCIe driver mgross
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