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| H A D | stmm_sp.c | ed89aa36c3d83cdc1d26d4512ed6f56cfe047919 Tue Aug 19 13:49:29 UTC 2025 Yeoreum Yun <yeoreum.yun@arm.com> core: arm: stmm_sp: return FFA_NOT_SUPPORTED for undefined FFA functions
edk2's patch ("ArmFfaLib: Add Rx/Tx support for Stmm secure partition") [0]
added Rx/Tx buffer mapping support to ArmFfaStandaloneMm(Core)Lib.
However, stmm_sp does not require Rx/Tx buffer mapping and
its SVC handler is lightweight. Therefore, when it receives
an undefined FFA function, it is sufficient to return FFA_NOT_SUPPORTED to
StandaloneMm instead of panicking.
This also aligns with the FF-A specification, which requires returning
FFA_NOT_SUPPORTED when an unimplemented function ID is received.
If StandaloneMm fails to initialize, it will return FFA_ERROR.
In this case, there is no way to keep the stmm_sp TA alive,
so panic is called.
Otherwise, StandaloneMm will return with DIRECT_MSG_RESP.
Link: https://github.com/tianocore/edk2/pull/11080/commits/75ca159e57dbe081b89373046280f34d67571852 [0]
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Tested-by: Mikko Rapeli <mikko.rapeli@linaro.org>
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