This patch series introduces Trusted Execution Environment (TEE) driver for AMD APU enabled systems. The TEE is a secure area of a processor which ensures that sensitive data is stored, processed and protected in an isolated and trusted environment. The AMD Secure Processor is a dedicated processor which provides TEE to enable HW platform security. It offers protection against software attacks generated in Rich Operating System (Rich OS) such as Linux running on x86. The AMD-TEE Trusted OS running on AMD Secure Processor allows loading and execution of security sensitive applications called Trusted Applications (TAs). An example of a TA would be a DRM (Digital Rights Management) TA written to enforce content protection.
Linux already provides a tee subsystem, which is described in [1]. The tee subsystem provides a generic TEE ioctl interface which can be used by user space to talk to a TEE driver. AMD-TEE driver registers with tee subsystem and implements tee function callbacks in an AMD platform specific manner.
The following TEE commands are recognized by AMD-TEE Trusted OS: 1. TEE_CMD_ID_LOAD_TA : Load Trusted Application (TA) binary into TEE environment 2. TEE_CMD_ID_UNLOAD_TA : Unload TA binary from TEE environment 3. TEE_CMD_ID_OPEN_SESSION : Open session with loaded TA 4. TEE_CMD_ID_CLOSE_SESSION : Close session with loaded TA 5. TEE_CMD_ID_INVOKE_CMD : Invoke a command with loaded TA 6. TEE_CMD_ID_MAP_SHARED_MEM : Map shared memory 7. TEE_CMD_ID_UNMAP_SHARED_MEM : Unmap shared memory
Each command has its own payload format. The AMD-TEE driver creates a command buffer payload for submission to AMD-TEE Trusted OS.
This patch series has a dependency on another patch set titled - Add TEE interface support to AMD Secure Processor driver. Link: https://lkml.org/lkml/2019/12/4/42
v3: * Updated [1] with driver details
v2: * Added a helper API in AMD Secure Processor driver, which can be called by AMD-TEE driver during module init to check if TEE is present on the device * Added proper checks for parameter attribute variable * Used tee_shm_pool_alloc() to allocate struct tee_shm_pool data structure * Removed all references to tee_private.h header file in driver code, except for the file drivers/tee/amdtee/core.c. The driver loads TA binary by calling request_firmware(), which takes struct device* as one of its arguments. The device 'dev' field is part of struct tee_device, defined in tee_private.h
[1] https://www.kernel.org/doc/Documentation/tee.txt
Rijo Thomas (4): tee: allow compilation of tee subsystem for AMD CPUs tee: add AMD-TEE driver tee: amdtee: check TEE status during driver initialization Documentation: tee: add AMD-TEE driver details
Documentation/tee.txt | 81 ++++++ drivers/crypto/ccp/tee-dev.c | 11 + drivers/tee/Kconfig | 4 +- drivers/tee/Makefile | 1 + drivers/tee/amdtee/Kconfig | 8 + drivers/tee/amdtee/Makefile | 5 + drivers/tee/amdtee/amdtee_if.h | 183 +++++++++++++ drivers/tee/amdtee/amdtee_private.h | 159 +++++++++++ drivers/tee/amdtee/call.c | 373 ++++++++++++++++++++++++++ drivers/tee/amdtee/core.c | 516 ++++++++++++++++++++++++++++++++++++ drivers/tee/amdtee/shm_pool.c | 93 +++++++ include/linux/psp-tee.h | 18 ++ include/uapi/linux/tee.h | 1 + 13 files changed, 1451 insertions(+), 2 deletions(-) create mode 100644 drivers/tee/amdtee/Kconfig create mode 100644 drivers/tee/amdtee/Makefile create mode 100644 drivers/tee/amdtee/amdtee_if.h create mode 100644 drivers/tee/amdtee/amdtee_private.h create mode 100644 drivers/tee/amdtee/call.c create mode 100644 drivers/tee/amdtee/core.c create mode 100644 drivers/tee/amdtee/shm_pool.c
-- 1.9.1