Main updates from the previous version [1]: - Remove the alternate boot sequence: rproc_alt_fw_boot() - Introduce tee_rproc_parse_fw function - create a cached table as done inrproc_elf_load_rsc_table[2], - PR sent to OP-TEE to allow TA_RPROC_FW_CMD_LOAD_FW service re-entrance[3]. - Rework TEE_REMOTEPROC description in Kconfig - Introduce proc::tee_interface Patch commit messages list updates with more details base-commit: 62210f7509e13a2caa7b080722a45229b8f17a0a [1] https://lore.kernel.org/linux-arm-kernel/Zdjl6Z2ktTwi+oWp@p14s/T/#m53f994237dc984c5dbbe3c75d2c30fcfff8548a0 [2] https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_elf_loader.c#L326 [3] https://github.com/OP-TEE/optee_os/pull/6743 Description of the feature: This series proposes the implementation of a remoteproc tee driver to communicate with a TEE trusted application responsible for authenticating and loading the remoteproc firmware image in an Arm secure context. 1) Principle: The remoteproc tee driver provides services to communicate with the OP-TEE trusted application running on the Trusted Execution Context (TEE). The trusted application in TEE manages the remote processor lifecycle: - authenticating and loading firmware images, - isolating and securing the remote processor memories, - supporting multi-firmware (e.g., TF-M + Zephyr on a Cortex-M33), - managing the start and stop of the firmware by the TEE. 2) Format of the signed image: Refer to: https://github.com/OP-TEE/optee_os/blob/master/ta/remoteproc/src/remoteproc_core.c#L18-L57 3) OP-TEE trusted application API: Refer to: https://github.com/OP-TEE/optee_os/blob/master/ta/remoteproc/include/ta_remoteproc.h 4) OP-TEE signature script Refer to: https://github.com/OP-TEE/optee_os/blob/master/scripts/sign_rproc_fw.py Example of usage: sign_rproc_fw.py --in <fw1.elf> --in <fw2.elf> --out <signed_fw.sign> --key ${OP-TEE_PATH}/keys/default.pem 5) Impact on User space Application No sysfs impact.the user only needs to provide the signed firmware image instead of the ELF image. For more information about the implementation, a presentation is available here (note that the format of the signed image has evolved between the presentation and the integration in OP-TEE). https://resources.linaro.org/en/resource/6c5bGvZwUAjX56fvxthxds Arnaud Pouliquen (4): remoteproc: Add TEE support dt-bindings: remoteproc: Add compatibility for TEE support remoteproc: stm32: Create sub-functions to request shutdown and release remoteproc: stm32: Add support of an OP-TEE TA to load the firmware .../bindings/remoteproc/st,stm32-rproc.yaml | 51 +- drivers/remoteproc/Kconfig | 10 + drivers/remoteproc/Makefile | 1 + drivers/remoteproc/stm32_rproc.c | 144 ++++-- drivers/remoteproc/tee_remoteproc.c | 434 ++++++++++++++++++ include/linux/remoteproc.h | 4 + include/linux/tee_remoteproc.h | 112 +++++ 7 files changed, 711 insertions(+), 45 deletions(-) create mode 100644 drivers/remoteproc/tee_remoteproc.c create mode 100644 include/linux/tee_remoteproc.h base-commit: 62210f7509e13a2caa7b080722a45229b8f17a0a -- 2.25.1
