Re: [PATCH RFC 2/2] mailbox: tmelite-qmp: Introduce QCOM TMEL QMP mailbox driver

From: Krzysztof Kozlowski
Date: Thu Dec 05 2024 - 03:14:56 EST


On 05/12/2024 09:06, Sricharan R wrote:
> From: Sricharan Ramabadhran <quic_srichara@xxxxxxxxxxx>
>
> The QMP mailbox is the primary means of communication between TME-L SS
> and other subsystem on the SoC. A dedicated pair of inbound and outbound
> mailboxes is implemented for each subsystem/external execution environment
> which needs to communicate with TME-L for security services. The inbound
> mailboxes are used to send IPC requests to TME-L, which are then processed
> by TME-L firmware and accordingly the responses are sent to the requestor
> via outbound mailboxes.
>
> It is an IPC transport protocol which is light weight and supports
> a subset of API's. It handles link initialization, negotiation,
> establishment and communication across client(APPSS/BTSS/AUDIOSS)
> and server(TME-L SS).
>
> ----------------------------------------------- ---------------------------------------------------
> | | | |
> | SOC CLIENT | SOC | TME-L SS |
> | | AHB | |
> | ---------- --------- --------- | | ------ ------- -------- ------------ |
> | | | | | | | | WO | | | R | | | | |SERVICES | |
> | | APPS |<-->| TMEL |<->| |------------->| | IN |-->| | | TMEL | |-------- | |
> | | | | COM | | QMP | | RO | | | W | QMP |<--->| COM |<-->| a) ATTEST | |
> | | | | | | |<-------------| | OUT |<--| | | | | b) CRYPTO | |
> | | | | | | | | | | | | | | | | .. more | |
> | --------- --------- --------- | | ------ ------- ------- ------------ |
> | | | |
> ----------------------------------------------- --------------------------------------------------


Hardware description is much more suitable for the binding, not to the
driver. You wrote the same in cover letter and here... but not in actual
hardware description - binding.

>
> TME-L SS provides different kinds of services like secureboot, remote image authentication,
> key management, crypto, OEM provisioning etc. This patch adds support for remote image
> authentication. Support for rest of the services can be added.


Please wrap commit message according to Linux coding style / submission
process (neither too early nor over the limit):
https://elixir.bootlin.com/linux/v6.4-rc1/source/Documentation/process/submitting-patches.rst#L597

>
> Remote proc driver subscribes to this mailbox and uses the mbox_send_message to use
> TME-L to securely authenticate/teardown the images.
>
> The intention of posting this is to get the design reviewed/corrected since there are also
> other possible ways of having this SS support.


If you do not Cc maintainers, don't expect much answer. Missing Qcom amd
remoteproc maintainers.



Best regards,
Krzysztof