RE: [PATCH v3 0/9] Make SCMI transport as standalone drivers

[Peng Fan]

> Subject: [PATCH v3 0/9] Make SCMI transport as standalone drivers
> 
> 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 [1/9] is a fix around the chan_free method for OPTEE transport; it
> is really unrelated to this series, but included to avoid conflicts.
> 
> Patch [2/9] is a mostly unrelated (but much needed) clean-up from
> Peng, which I included in this series to avoid conflicts at merge.
> 
> Patch [3/9] simply collects the existing datagram manipulation helpers
> in a pair of function pointers structures, in preparation for later reworks.
> 
> Patch [4/9] 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 5,6,7,8 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 [9/9] 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 ]
> 
> Based on v6.11-rc1
> 
> Any feedback, and especially testing (:D) is welcome.

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

Regards,
Peng.
> 
> Thanks,
> Cristian
> 
> ---
> v2 --> v3
> - rebased on v6.11-rc1
> - fixed spacing in Kconfig
> - fixed Copyrights all over
> - fixed platform_driver_register callsite in OPTEE transport
> - refactored DEFINE_SCMI_TRANSPORT_DRIVER() to:
>   + use alloc + add_data + add platform drivers methods so as to
> implictly
>     use a standard default device_release method.
>   + drop .remove method in favour of devres_add_action_or_reset
>   + use explicit parameter passing (no more concatenation)
> - renamed scmi_transport_lookup() to scmi_transport_setup()
> - use IOMEM_ERR_PTR to avoid sparse issues
> 
> v1 --> v2
> - fixed setup_shmem_iomap to address also SMC needs (QC/nikunj)
>   (silencing also warnings by kernel test robot <lkp@xxxxxxxxx>)
> - 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@xxxxxxxxx>)
> 
> 
> Cristian Marussi (8):
>   firmware: arm_scmi: Fix double free in OPTEE transport
>   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            | 142 +++++---------
>  drivers/firmware/arm_scmi/msg.c               |  32 ++-
>  .../{mailbox.c => scmi_transport_mailbox.c}   |  72 +++----
>  .../{optee.c => scmi_transport_optee.c}       | 130 ++++++-------
>  .../arm_scmi/{smc.c => scmi_transport_smc.c}  |  57 +++---
>  .../{virtio.c => scmi_transport_virtio.c}     | 102 +++++-----
>  drivers/firmware/arm_scmi/shmem.c             |  85 ++++++--
>  10 files changed, 477 insertions(+), 356 deletions(-)  rename
> drivers/firmware/arm_scmi/{mailbox.c => scmi_transport_mailbox.c}
> (86%)  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
>