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d0476a59de
Adds support for asynchronous notifications from OP-TEE in secure world when communicating via FF-A. In principle from OP-TEE and kernel driver point of view this works in the same way as for the SMC ABI based implementation. The OP-TEE FF-A ABI is expanded in OPTEE_FFA_EXCHANGE_CAPABILITIES with the capability OPTEE_FFA_SEC_CAP_ASYNC_NOTIF to indicate that OP-TEE supports asynchronous notifications. OPTEE_FFA_ENABLE_ASYNC_NOTIF is also added to tell that the driver has successfully initialized these notifications. Notification capability is negotiated while the driver is initialized. If both sides supports these notifications then they are enabled. The notification concept in this driver is merged with the FF-A concept, the lower 64 values are reserved for FF-A as asynchronous notifications while the synchronous notifications use the higher values. So a FF-A notification has to be allocated for each discrete asynchronous notification value needed. Only one asynchronous notification value is used at the moment, the "do bottom half" notification. Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Linux kernel
============
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