Hi all,

This adds support for asynchronous notifications from OP-TEE in secure world to the OP-TEE driver. This allows a design with a top half and bottom half type of driver where the top half runs in secure interrupt context and a notifications tells normal world to schedule a yielding call to do the bottom half processing.

An edge-triggered interrupt is used to notify the driver that there are asynchronous notifications pending.

The documentation and DT bindings patches are now well reviewed, but the patches with code would do with some more attention.

v5->v6: * Rebased on v5.15-rc2 * Replaced "tee: add tee_dev_open_helper() primitive" with "tee: export teedev_open() and teedev_close_context()" since it turned out that the normal teedev functions could be used instead as noted by Sumit. * Changed "optee: add asynchronous notifications" to use the exported teedev_open() and teedev_close_context() functions instead.

v4->v5: * Rebased on v5.14-rc7 * Updated documentation to clarify that one interrupt may represent multiple notifications as requested. * Applied Marc's and Rob's tags

v3->v4: * Clarfied the expected type of interrypt is edge-triggered, both in the normal documentation and in the DT bindings as requested.

v2->v3: * Rebased on v5.14-rc2 which made the patch "dt-bindings: arm: Convert optee binding to json-schema" from the V2 patch set obsolete. * Applied Ard's Acked-by on "optee: add asynchronous notifications"

v1->v2: * Added documentation * Converted optee bindings to json-schema and added interrupt property * Configure notification interrupt from DT instead of getting it from secure world, suggested by Ard Biesheuvel ardb@kernel.org.

Thanks, Jens

Jens Wiklander (6): docs: staging/tee.rst: add a section on OP-TEE notifications dt-bindings: arm: optee: add interrupt property tee: fix put order in teedev_close_context() tee: export teedev_open() and teedev_close_context() optee: separate notification functions optee: add asynchronous notifications

.../arm/firmware/linaro,optee-tz.yaml | 7 + Documentation/staging/tee.rst | 30 +++ drivers/tee/optee/Makefile | 1 + drivers/tee/optee/call.c | 27 +++ drivers/tee/optee/core.c | 87 +++++-- drivers/tee/optee/notif.c | 226 ++++++++++++++++++ drivers/tee/optee/optee_msg.h | 9 + drivers/tee/optee/optee_private.h | 23 +- drivers/tee/optee/optee_rpc_cmd.h | 31 +-- drivers/tee/optee/optee_smc.h | 75 +++++- drivers/tee/optee/rpc.c | 73 +----- drivers/tee/tee_core.c | 10 +- include/linux/tee_drv.h | 14 ++ 13 files changed, 496 insertions(+), 117 deletions(-) create mode 100644 drivers/tee/optee/notif.c