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

[Krzysztof Kozlowski <krzk@kernel.org>]

On 05/12/2024 09:06, Sricharan R wrote:
> From: Sricharan Ramabadhran <quic_srichara@quicinc.com>
> 
> 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