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 <PAXPR04MB84592E272D5C16813529815588A52@PAXPR04MB8459.eurprd04.prod.outlook.com>
Date: Thu, 11 Jul 2024 13:26:16 +0000
From: Peng Fan <peng.fan@....com>
To: Cristian Marussi <cristian.marussi@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "arm-scmi@...r.kernel.org"
	<arm-scmi@...r.kernel.org>
CC: "sudeep.holla@....com" <sudeep.holla@....com>,
	"james.quinlan@...adcom.com" <james.quinlan@...adcom.com>,
	"f.fainelli@...il.com" <f.fainelli@...il.com>, "vincent.guittot@...aro.org"
	<vincent.guittot@...aro.org>, "etienne.carriere@...com"
	<etienne.carriere@...com>, "Peng Fan (OSS)" <peng.fan@....nxp.com>,
	"michal.simek@....com" <michal.simek@....com>, "quic_sibis@...cinc.com"
	<quic_sibis@...cinc.com>, "quic_nkela@...cinc.com" <quic_nkela@...cinc.com>,
	"ptosi@...gle.com" <ptosi@...gle.com>, "dan.carpenter@...aro.org"
	<dan.carpenter@...aro.org>, "souvik.chakravarty@....com"
	<souvik.chakravarty@....com>
Subject: RE: [PATCH 0/8] Make SCMI transport as standalone drivers

> Subject: [PATCH 0/8] Make SCMI transport as standalone drivers

You may need use V2 here :)
> 
> Hi all,
> 
> Till now the SCMI transport layer was being built embedded into in the
> core SCMI stack.
> 
> Some of these transports, despite being currently part of the main
> SCMI module, are indeed also registered with different subsystems like
> optee or virtio, and actively probed also by those: this led to a few
> awkward and convoluted tricks to properly handle such interactions at
> boot time in the SCMI stack.
> 
> Moreover some partner expressed the desire to be able to fully
> modularize the transports components.
> 
> This series aim to make all such transports as standalone drivers that
> can be optionally loaded as modules.
> 
> In order to do this, at first some new mechanism is introduced to
> support this new capability while maintaining, in parallel, the old
> legacy embedded transports; then each transport, one by one, is
> transitioned to be a standalone driver and finally the old legacy
> support for embedded transport is removed.
> 
> Patch [1/8] is a mostly unrelated (but much needed) clean-up from
> Peng, which I included in this series to avoid conflicts at merge.
> 
> Patch [2/8] simply collects the existing datagram manipulation helpers
> in a pair of function pointers structures, in preparation for later reworks.
> 
> Patch [3/8] adds the bulk of the new logic to the core SCMI stack and
> then each existing transport is transitioned to be a standalone driver in
> patches 4,5,6,7 while shuffling around the compatibles. (no DT change
> is needed of curse for backward compatibility) While doing this I kept
> the module authorship in line with the main
> author(S) as spitted out by git-blame.
> 
> Finally patch [8/8] removes all the legacy dead code from the core
> SCMI stack.
> 
> No new symbol EXPORT has been added.
> 
> The new transport drivers have been tested, as built-in and LKM, as
> follows:
> 
> - mailbox on JUNO
> - virtio on emulation
> - optee on QEMU/optee using Linaro setup
> 
> Exercised using the regular SCMI drivers stack and the SCMI ACS suite,
> testing commands, replies, delayed responses and notification.
> 
> Multiple virtual SCMI instances support has been tested too.
> 
> SMC has NOT been tested/exercised at run-time, only compile-tested.
> (due to lack of hardware)
> 
> Note that in this new setup, all the probe deferral and retries between
> the SCMI core stack and the transports has been removed, since no
> more needed.
> 
> Moreover the new drivers have been tested also with a fully
> modularized SCMI stack, i.e.:
> 
>   scmi-core.ko + scmi-module.ko + scmi_transport_*.ko [ + vendor
> modules ]
> 
> ToBeDone:
>  - completely remove any dependency at build time at the Kconfig level
> between
>    the SCMI core and the transport drivers: so that the transports will be
>    dependent only on the related subsystems (optee/virtio/mailbox/smc)
>    (easy to be done but maybe it is not worth...)
>  - integrate per-platform transport configuration capabilities
>    (max_rx_timeout_ms & friends..)
> 
> Based on sudeep/for-next/scmi/updates.
> 
> Any feedback, and especially testing (:D) is welcome.
> 

For the v2 patchset:
Tested-by: Peng Fan <peng.fan@....com>  #i.MX95-19x19-EVK

Regards,
Peng.

> Thanks,
> Cristian
> 
> ---
> v1 --> v2
> - fixed setup_shmem_iomap to address also SMC needs (QC/nikunj)
>   (silencing also warnings by kernel test robot <lkp@...el.com>)
> - using __free OF cleanup.h magic in setup_shmme_iomap
> - properly handle platform_driver_register() failures (Dan)
> - fixed a few commit message style
> - added a few missing static in scmi_desc
>   (addresses warnings by kernel test robot <lkp@...el.com>)
> 
> Cristian Marussi (7):
>   firmware: arm_scmi: Introduce packet handling helpers
>   firmware: arm_scmi: Add support for standalone transport drivers
>   firmware: arm_scmi: Make MBOX transport a standalone driver
>   firmware: arm_scmi: Make SMC transport a standalone driver
>   firmware: arm_scmi: Make OPTEE transport a standalone driver
>   firmware: arm_scmi: Make VirtIO transport a standalone driver
>   firmware: arm_scmi: Remove legacy transport-layer code
> 
> Peng Fan (1):
>   firmware: arm_scmi: Introduce setup_shmem_iomap
> 
>  drivers/firmware/arm_scmi/Kconfig             |  20 +-
>  drivers/firmware/arm_scmi/Makefile            |   9 +-
>  drivers/firmware/arm_scmi/common.h            | 184 +++++++++++++----
> -
>  drivers/firmware/arm_scmi/driver.c            | 140 +++++--------
>  drivers/firmware/arm_scmi/msg.c               |  34 +++-
>  .../{mailbox.c => scmi_transport_mailbox.c}   |  69 ++++---
>  .../{optee.c => scmi_transport_optee.c}       | 124 +++++-------
>  .../arm_scmi/{smc.c => scmi_transport_smc.c}  |  58 +++---
>  .../{virtio.c => scmi_transport_virtio.c}     | 103 +++++-----
>  drivers/firmware/arm_scmi/shmem.c             |  85 ++++++--
>  10 files changed, 468 insertions(+), 358 deletions(-)  rename
> drivers/firmware/arm_scmi/{mailbox.c => scmi_transport_mailbox.c}
> (87%)  rename drivers/firmware/arm_scmi/{optee.c =>
> scmi_transport_optee.c} (89%)  rename
> drivers/firmware/arm_scmi/{smc.c => scmi_transport_smc.c} (87%)
> rename drivers/firmware/arm_scmi/{virtio.c => scmi_transport_virtio.c}
> (94%)
> 
> --
> 2.45.2
> 

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