On Tue, 29 Jan 2019 at 06:50, Sumit Garg <sumit.garg@xxxxxxxxxx> wrote: > > This series introduces a generic TEE bus driver concept for TEE based > kernel drivers which would like to communicate with TEE based devices/ > services. > > Patch #1 adds TEE bus concept where devices/services are identified via > Universally Unique Identifier (UUID) and drivers register a table of > device UUIDs which they can support. This concept also allows for device > enumeration to be specific to corresponding TEE implementation like > OP-TEE etc. > > Patch #2 adds supp_nowait flag for non-blocking requests arising via > TEE internal client interface. > > Patch #3 adds TEE bus device enumeration support for OP-TEE. OP-TEE > provides a pseudo TA to enumerate TAs which can act as devices/services > for TEE bus. > > Patch #4 adds OP-TEE based hwrng driver which act as TEE bus driver. > On ARM SoC's with TrustZone enabled, peripherals like entropy sources > might not be accessible to normal world (linux in this case) and rather > accessible to secure world (OP-TEE in this case) only. So this driver > aims to provides a generic interface to OP-TEE based random number > generator service. > > Example case is Developerbox based on Socionext's Synquacer SoC [1] > which provides 7 thermal sensors accessible from secure world only which > could be used as entropy sources (thermal/measurement noise). > > [1] https://www.96boards.org/product/developerbox/ > > Changes in v6: > > 1. Incorporate some nitpicks in patch #1 and #3. > 2. Bundle all statics in a data structure in patch #4 and use dev_* > instead of pr_*. > 3. Add reviewed-by tags for patch #1, #2 and #3. > > Changes in v5: > > 1. Add support in module device table for TEE bus devices. > 2. Correct license for optee-rng module. > > Changes in v4: > > 1. Use typedef instead of single member tee_client_device_id struct. > 2. Incorporate TEE bus nitpicks. > > Changes in v3: > > 1. Fixed bus error path in Patch #1. > 2. Reversed order of Patch #2 and #3. > 3. Fixed miscellaneous syntax comments and memory leak. > 4. Added comments in Patch #2 for supp_nowait flag. > > Changes in v2: > > Based on review comments, the scope of this series has increased as > follows: > > 1. Added TEE bus driver framework. > 2. Added OP-TEE based device enumeration. > 3. Register optee-rng driver as TEE bus driver. > 4. Removed DT dependency for optee-rng device UUID. > 5. Added supp_nowait flag. > > Sumit Garg (4): > tee: add bus driver framework for TEE based devices > tee: add supp_nowait flag in tee_context struct > tee: optee: add TEE bus device enumeration support > hwrng: add OP-TEE based rng driver > For this series Tested-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> although I had to load optee.ko manually in order for the udev autoload of optee_rng to trigger. Not sure where the discussion went last time, but could we please add "linaro,optee-tz" as a DT modalias to the optee.ko module in any case? > MAINTAINERS | 5 + > drivers/char/hw_random/Kconfig | 15 ++ > drivers/char/hw_random/Makefile | 1 + > drivers/char/hw_random/optee-rng.c | 298 +++++++++++++++++++++++++++++++++++++ > drivers/tee/optee/Makefile | 1 + > drivers/tee/optee/core.c | 4 + > drivers/tee/optee/device.c | 155 +++++++++++++++++++ > drivers/tee/optee/optee_private.h | 3 + > drivers/tee/optee/supp.c | 10 +- > drivers/tee/tee_core.c | 67 ++++++++- > include/linux/mod_devicetable.h | 9 ++ > include/linux/tee_drv.h | 38 ++++- > scripts/mod/devicetable-offsets.c | 3 + > scripts/mod/file2alias.c | 19 +++ > 14 files changed, 622 insertions(+), 6 deletions(-) > create mode 100644 drivers/char/hw_random/optee-rng.c > create mode 100644 drivers/tee/optee/device.c > > -- > 2.7.4 >
