optee_enumerate_devices()c
| 2024-11-7
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  • optee_enumerate_devices()
    • Enumerate the TA devices.
    • __optee_enumerate_devices()
      • PTA UUID:
        • Call tee_client_open_context() to open TEE devices with OP-TEE driver.
        • Prepare session arg (struct tee_ioctl_open_session_arg).
        • Call tee_client_open_session() to open session with device enumeration pseudo Trusted Application with the session arg using PTA UUID.
        • Call get_devices() to get the required shared memory size for UUIDs of pseudo TAs.
          • Shared memory size = sizeof(UUID) * Number of pseudo TAs
        • After retrieving the shared memory size, call tee_shm_alloc_kernel_buf() to allocate the shared memory buffer for UUIDs of pseudo TAs.
        • Call get_devices() again to get the UUIDs of pseudo TAs. The UUIDs of psuedo TA are stored in the allocated shared memory by OP-TEE.
        • For each pseudo TA, call optee_register_device() to register the device to TEE bus (tee_bus_type).
          • This will eventually call tee_client_device_match() to match the driver for the TA device based on UUID. Driver’s probe() callback will be called if matches.
            • For example: optee-rngs driver (drivers/char/hw_random/optee-rngs.c).
              • OP-TEE driver is implemented as a module and is initialized through module_init(). OP-TEE driver sets its bus to tee_bus_type.
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