On Mon, 28 Aug 2023 at 22:29, Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx> wrote: > > SHM Bridge is a mechanism allowing to map limited areas of kernel's > virtual memory to physical addresses and share those with the > trustzone in order to not expose the entire RAM for SMC calls. > > This series adds support for Qualcomm SHM Bridge in form of a platform > driver and library functions available to users. It enables SHM Bridge > support for three platforms and contains a bunch of cleanups for > qcom-scm. Which users do you expect for this API? Also, could you please describe your design a bit more? Why have you implemented the shm-bridge as a separate driver rather than a part of the SCM driver? > > Bartosz Golaszewski (11): > firmware: qcom-scm: drop unneeded 'extern' specifiers > firmware: qcom-scm: order includes alphabetically > firmware: qcom-scm: atomically assign and read the global __scm > pointer > firmware: qcom-scm: add support for SHM bridge operations > dt-bindings: document the Qualcomm TEE Shared Memory Bridge > firmware: qcom-shm-bridge: new driver > firmware: qcom-scm: use SHM bridge if available > arm64: defconfig: enable Qualcomm SHM bridge module > arm64: dts: qcom: sm8450: enable SHM bridge > arm64: dts: qcom: sa8775p: enable SHM bridge > arm64: dts: qcom: sm8150: enable SHM bridge > > .../bindings/firmware/qcom,shm-bridge.yaml | 36 ++ > arch/arm64/boot/dts/qcom/sa8775p.dtsi | 4 + > arch/arm64/boot/dts/qcom/sm8150.dtsi | 4 + > arch/arm64/boot/dts/qcom/sm8450.dtsi | 4 + > arch/arm64/configs/defconfig | 1 + > drivers/firmware/Kconfig | 8 + > drivers/firmware/Makefile | 1 + > drivers/firmware/qcom-shm-bridge.c | 452 ++++++++++++++++++ > drivers/firmware/qcom_scm-smc.c | 20 +- > drivers/firmware/qcom_scm.c | 106 +++- > drivers/firmware/qcom_scm.h | 3 + > include/linux/firmware/qcom/qcom_scm.h | 109 +++-- > include/linux/firmware/qcom/shm-bridge.h | 32 ++ > 13 files changed, 712 insertions(+), 68 deletions(-) > create mode 100644 Documentation/devicetree/bindings/firmware/qcom,shm-bridge.yaml > create mode 100644 drivers/firmware/qcom-shm-bridge.c > create mode 100644 include/linux/firmware/qcom/shm-bridge.h > > -- > 2.39.2 > -- With best wishes Dmitry
