linux-kernel - [PATCH 0/3] OP-TEE RPC argument cache

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Message-Id: <20220301194830.3557578-1-jens.wiklander@linaro.org>
Date:   Tue,  1 Mar 2022 20:48:27 +0100
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     linux-kernel@...r.kernel.org, op-tee@...ts.trustedfirmware.org
Cc:     Sumit Garg <sumit.garg@...aro.org>,
        Jens Wiklander <jens.wiklander@...aro.org>
Subject: [PATCH 0/3] OP-TEE RPC argument cache

Hi all,

This patchset optimizes handling of the argument struction passed to
call_with_arg when doing a yielding call to OP-TEE.

Prior to this was this structure allocated before the yielding call and
then freed after it had returned. In case many calls are made in succession
this results in quite a bit of unncesary allocte/free and possibly also
switching back and forth to secure work in order to register if needed.

Another optimization handles the way the argument struct needed to do RPC
is passed. Please see the patch "optee: add OPTEE_SMC_CALL_WITH_RPC_ARG"
for details.

This patchset is based the next branch [1] in my kernel to avoid conflict
with other recent patches.

Thanks,
Jens

[1] https://git.linaro.org/people/jens.wiklander/linux-tee.git/log/?h=next

Jens Wiklander (3):
  optee: add OPTEE_SMC_CALL_WITH_RPC_ARG
  optee: add FF-A capability OPTEE_FFA_SEC_CAP_ARG_OFFSET
  optee: cache argument shared memory structs

 drivers/tee/optee/call.c          | 238 ++++++++++++++++++++++++------
 drivers/tee/optee/core.c          |   1 +
 drivers/tee/optee/ffa_abi.c       |  36 +++--
 drivers/tee/optee/optee_ffa.h     |  12 +-
 drivers/tee/optee/optee_private.h |  31 +++-
 drivers/tee/optee/optee_smc.h     |  47 +++++-
 drivers/tee/optee/smc_abi.c       | 151 +++++++++++++++----
 7 files changed, 419 insertions(+), 97 deletions(-)

-- 
2.31.1