netdev - Re: [PATCH v3 net-next 5/5] net: wwan: t7xx: Devlink documentation

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Date:   Fri, 6 Jan 2023 10:37:00 -0800
From:   Jesse Brandeburg <jesse.brandeburg@...el.com>
To:     <m.chetan.kumar@...ux.intel.com>, <netdev@...r.kernel.org>
CC:     <kuba@...nel.org>, <davem@...emloft.net>,
        <johannes@...solutions.net>, <ryazanov.s.a@...il.com>,
        <loic.poulain@...aro.org>, <ilpo.jarvinen@...ux.intel.com>,
        <ricardo.martinez@...ux.intel.com>,
        <chiranjeevi.rapolu@...ux.intel.com>, <haijun.liu@...iatek.com>,
        <edumazet@...gle.com>, <pabeni@...hat.com>, <linuxwwan@...el.com>,
        <linuxwwan_5g@...el.com>, <chandrashekar.devegowda@...el.com>,
        <matthias.bgg@...il.com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-doc@...r.kernel.org>,
        <jiri@...dia.com>, <corbet@....net>
Subject: Re: [PATCH v3 net-next 5/5] net: wwan: t7xx: Devlink documentation

On 1/6/2023 8:28 AM, m.chetan.kumar@...ux.intel.com wrote:
> From: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
> 
> Document the t7xx devlink commands usage for fw flashing &

it would make the documentation easier and faster to read if you just 
spelled out fw as firmware.

> coredump collection.
> 
> Refer to t7xx.rst file for details.
> 
> Signed-off-by: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
> Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@...el.com>
> --
> v3:
>   * No Change.
> v2:
>   * Documentation correction.
>   * Add param details.
> ---
>   Documentation/networking/devlink/index.rst |   1 +
>   Documentation/networking/devlink/t7xx.rst  | 161 +++++++++++++++++++++
>   2 files changed, 162 insertions(+)
>   create mode 100644 Documentation/networking/devlink/t7xx.rst
> 
> diff --git a/Documentation/networking/devlink/index.rst b/Documentation/networking/devlink/index.rst
> index fee4d3968309..0c4f5961e78f 100644
> --- a/Documentation/networking/devlink/index.rst
> +++ b/Documentation/networking/devlink/index.rst
> @@ -66,3 +66,4 @@ parameters, info versions, and other features it supports.
>      prestera
>      iosm
>      octeontx2
> +   t7xx
> diff --git a/Documentation/networking/devlink/t7xx.rst b/Documentation/networking/devlink/t7xx.rst
> new file mode 100644
> index 000000000000..de220878ad76
> --- /dev/null
> +++ b/Documentation/networking/devlink/t7xx.rst
> @@ -0,0 +1,161 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +====================
> +t7xx devlink support
> +====================
> +
> +This document describes the devlink features implemented by the ``t7xx``
> +device driver.
> +
> +Parameters
> +==========
> +The ``t7xx_driver`` driver implements the following driver-specific parameters.
> +
> +.. list-table:: Driver-specific parameters implemented
> +   :widths: 5 5 5 85
> +
> +   * - Name
> +     - Type
> +     - Mode
> +     - Description
> +   * - ``fastboot``
> +     - boolean
> +     - driverinit
> +     - Set this param to enter fastboot mode.
> +
> +Flash Update
> +============
> +
> +The ``t7xx`` driver implements the flash update using the ``devlink-flash``
> +interface.
> +
> +The driver uses DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT to identify the type of
> +firmware image that need to be programmed upon the request by user space application.
> +
> +The supported list of firmware image types is described below.
> +
> +.. list-table:: Firmware Image types
> +    :widths: 15 85
> +
> +    * - Name
> +      - Description
> +    * - ``preloader``
> +      - The first-stage bootloader image
> +    * - ``loader_ext1``
> +      - Preloader extension image
> +    * - ``tee1``
> +      - ARM trusted firmware and TEE (Trusted Execution Environment) image
> +    * - ``lk``
> +      - The second-stage bootloader image
> +    * - ``spmfw``
> +      - MediaTek in-house ASIC for power management image
> +    * - ``sspm_1``
> +      - MediaTek in-house ASIC for power management under secure world image
> +    * - ``mcupm_1``
> +      - MediaTek in-house ASIC for cpu power management image
> +    * - ``dpm_1``
> +      - MediaTek in-house ASIC for dram power management image
> +    * - ``boot``
> +      - The kernel and dtb image
> +    * - ``rootfs``
> +      - Root filesystem image
> +    * - ``md1img``
> +      - Modem image
> +    * - ``md1dsp``
> +      - Modem DSP image
> +    * - ``mcf1``
> +      - Modem OTA image (Modem Configuration Framework) for operators
> +    * - ``mcf2``
> +      - Modem OTA image (Modem Configuration Framework) for OEM vendors
> +    * - ``mcf3``
> +      - Modem OTA image (other usage) for OEM configurations
> +
> +``t7xx`` driver uses fastboot protocol for fw flashing. In the fw flashing

it would make the documentation easier and faster to read if you just 
spelled out fw as firmware.

> +procedure, fastboot command & response are exchanged between driver and wwan
> +device.
> +
> +The wwan device is put into fastboot mode via devlink reload command, by
> +passing "driver_reinit" action.
> +
> +$ devlink dev reload pci/0000:$bdf action driver_reinit
> +
> +Upon completion of fw flashing or coredump collection the wwan device is
> +reset to normal mode using devlink reload command, by passing "fw_activate"
> +action.
> +
> +$ devlink dev reload pci/0000:$bdf action fw_activate
> +
> +Flash Commands:
> +===============
> +
> +$ devlink dev flash pci/0000:$bdf file preloader_k6880v1_mdot2_datacard.bin component "preloader"
> +
> +$ devlink dev flash pci/0000:$bdf file loader_ext-verified.img component "loader_ext1"
> +
> +$ devlink dev flash pci/0000:$bdf file tee-verified.img component "tee1"
> +
> +$ devlink dev flash pci/0000:$bdf file lk-verified.img component "lk"
> +
> +$ devlink dev flash pci/0000:$bdf file spmfw-verified.img component "spmfw"
> +
> +$ devlink dev flash pci/0000:$bdf file sspm-verified.img component "sspm_1"
> +
> +$ devlink dev flash pci/0000:$bdf file mcupm-verified.img component "mcupm_1"
> +
> +$ devlink dev flash pci/0000:$bdf file dpm-verified.img component "dpm_1"
> +
> +$ devlink dev flash pci/0000:$bdf file boot-verified.img component "boot"
> +
> +$ devlink dev flash pci/0000:$bdf file root.squashfs component "rootfs"
> +
> +$ devlink dev flash pci/0000:$bdf file modem-verified.img component "md1img"
> +
> +$ devlink dev flash pci/0000:$bdf file dsp-verified.bin component "md1dsp"
> +
> +$ devlink dev flash pci/0000:$bdf file OP_OTA.img component "mcf1"
> +
> +$ devlink dev flash pci/0000:$bdf file OEM_OTA.img component "mcf2"
> +
> +$ devlink dev flash pci/0000:$bdf file DEV_OTA.img component "mcf3"
> +
> +Note: Component selects the partition type to be programmed.
> +
> +Regions
> +=======
> +
> +The ``t7xx`` driver supports core dump collection when device encounters
> +an exception. When wwan device encounters an exception, a snapshot of device
> +internal data will be taken by the driver using fastboot commands.
> +
> +Following regions are accessed for device internal data.
> +
> +.. list-table:: Regions implemented
> +    :widths: 15 85
> +
> +    * - Name
> +      - Description
> +    * - ``mr_dump``
> +      - The detailed modem component logs are captured in this region
> +    * - ``lk_dump``
> +      - This region dumps the current snapshot of lk
> +
> +
> +Region commands
> +===============
> +
> +$ devlink region show
> +
> +
> +$ devlink region new mr_dump
> +
> +$ devlink region read mr_dump snapshot 0 address 0 length $len
> +
> +$ devlink region del mr_dump snapshot 0
> +
> +$ devlink region new lk_dump
> +
> +$ devlink region read lk_dump snapshot 0 address 0 length $len
> +
> +$ devlink region del lk_dump snapshot 0
> +
> +Note: $len is actual len to be dumped.