Adding support for Arm FF-A v1.0 (Arm Firmware Framework for Armv8-A) [6].
FF-A describes interfaces (ABIs) that standardize communication between the Secure World and Normal World. These interfaces enable a pair of software sandboxes to communicate with each other. A sandbox aka partition could be a VM in the Normal or Secure world, an application in S-EL0, or a Trusted OS in S-EL1.
The FF-A transport is implemented as a data bus and a core driver is provided.
The FF-A driver uses the SMC ABIs defined by the FF-A specification to:
- Discover the presence of secure partitions (SPs) of interest - Access an SP's service through communication protocols e.g. EFI MM communication protocol
The FF-A support provides the following features:
- Being generic by design and can be used by any Arm 64-bit platform - The FF-A core driver - The FF-A bus is discoverable on demand at runtime - The driver provides callbacks to be used by clients to access the FF-A bus - FF-A driver can be compiled and used without EFI - Support for SMCCCv1.2 x0-x17 registers - A new command called armffa is provided as an example of how to access the FF-A bus - An FF-A Sandbox driver is provided with test cases - Support for FF-A MM communication - Enabling FF-A and MM communication in Corstone1000 platform
For more details about the FF-A core driver please refer to [7].
Please find at [8] an example of the expected boot logs when enabling FF-A support for a platform. In this example the platform is Corstone1000. But it can be any Arm 64-bit platform.
Changelog of the major changes: ===========================
v6:
* remove clearing x0-x17 registers after SMC calls * drop use of EFI runtime support for FF-A (We decided with Linaro to add this later) * drop discovery from initcalls (discovery will be on demand by FF-A users) * add FF-A runtime discovery at MM communication level * update the documentation and move it to doc/arch/arm64.ffa.rst
v5: [5]
* move changelogs in each commit to the changes section
v4: [4]
* add FF-A support README (doc/README.ffa.drv) * improving error handling by mapping the FF-A errors to standard errors and logs * replacing panics with an error log * align sandbox driver and tests with the new FF-A driver interfaces and new way of error handling * use the new FF-A driver interfaces for MM communication * discover MM partitions at runtime * copy FF-A driver private data to EFI runtime section at ExitBootServices() * moving the FF-A driver work to drivers/firmware/arm-ffa * improving features discovery in FFA_FEATURES * add remove/unbind functions to the FF-A core device * improve how the driver behaves when bus discovery is done more than once * move clearing x0-x17 registers code into a new macro like done in the linux kernel * enable EFI MM communication for the Corstone1000 platform
v3: [3]
* port x0-x17 registers support from linux kernel as defined by SMCCCv1.2 * align the interfaces of the u-boot FF-A driver with those in the linux FF-A driver * remove the FF-A helper layer * make the u-boot FF-A driver independent from EFI * provide an optional config that enables copying the driver data to EFI runtime section at ExitBootServices service * use 64-bit version of FFA_RXTX_MAP, FFA_MSG_SEND_DIRECT_{REQ, RESP} * update armffa command with the new driver interfaces
v2 [2]:
* make FF-A bus discoverable using device_{bind, probe} APIs * remove device tree support
v1 [1]:
* introduce FF-A bus driver with device tree support * introduce armffa command * introduce FF-A Sandbox driver * add FF-A Sandbox test cases * introduce FF-A MM communication
Cheers, Abdellatif
[1]: https://lore.kernel.org/all/20220329151659.16894-1-abdellatif.elkhlifi@arm.c... [2]: https://lore.kernel.org/all/20220415122803.16666-1-abdellatif.elkhlifi@arm.c... [3]: https://lore.kernel.org/all/20220801172053.20163-1-abdellatif.elkhlifi@arm.c... [4]: https://lore.kernel.org/all/20220926101723.9965-1-abdellatif.elkhlifi@arm.co... [5]: https://lore.kernel.org/all/20220926140827.15125-1-abdellatif.elkhlifi@arm.c... [6]: https://developer.arm.com/documentation/den0077/latest/ [7]: doc/arch/arm64.ffa.rst [8]: example of boot logs when enabling FF-A
``` U-Boot 2022.07 (Jul 11 2022 - 13:42:58 +0000) corstone1000 aarch64 ... Hit any key to stop autoboot: 0 ... [FFA] Conduit is SMC [FFA] FF-A driver 1.0 FF-A framework 1.0 [FFA] Versions are compatible [FFA] endpoint ID is 0 [FFA] Using 1 4KB page(s) for RX/TX buffers size [FFA] RX buffer at virtual address 0xfdf1b000 [FFA] TX buffer at virtual address 0xfdf1d000 [FFA] RX/TX buffers mapped [FFA] Reading partitions data from the RX buffer [FFA] Partition ID 8001 : info cached [FFA] Partition ID 8002 : info cached [FFA] Partition ID 8003 : info cached [FFA] 3 partition(s) found and cached [FFA] Preparing for checking partitions count [FFA] Searching partitions using the provided UUID [FFA] No partition found. Querying framework ... [FFA] Reading partitions data from the RX buffer [FFA] Number of partition(s) found matching the UUID: 1 EFI: Pre-allocating 1 partition(s) info structures [FFA] Preparing for filling partitions info [FFA] Searching partitions using the provided UUID [FFA] Partition ID 8003 matches the provided UUID EFI: MM partition ID 0x8003 ... EFI stub: Booting Linux Kernel... ... EFI stub: Exiting boot services... [FFA] Freeing RX/TX buffers Booting Linux on physical CPU 0x0000000000 [0x411fd040] ```
Cc: Tom Rini trini@konsulko.com Cc: Simon Glass sjg@chromium.org Cc: Ilias Apalodimas ilias.apalodimas@linaro.org Cc: Jens Wiklander jens.wiklander@linaro.org Cc: Achin Gupta achin.gupta@arm.com Cc: Drew Reed Drew.Reed@arm.com Cc: Vishnu Banavath vishnu.banavath@arm.com Cc: Xueliang Zhong Xueliang.Zhong@arm.com
Abdellatif El Khlifi (10): arm64: smccc: add support for SMCCCv1.2 x0-x17 registers lib: uuid: introduce be_uuid_str_to_le_bin function arm_ffa: introduce Arm FF-A low-level driver arm_ffa: efi: unmap RX/TX buffers arm_ffa: introduce armffa command arm_ffa: introduce the FF-A Sandbox driver arm_ffa: introduce Sandbox test cases for UCLASS_FFA arm_ffa: introduce armffa command Sandbox test arm_ffa: efi: introduce FF-A MM communication arm_ffa: efi: corstone1000: enable MM communication
MAINTAINERS | 11 + arch/arm/cpu/armv8/smccc-call.S | 53 + arch/arm/lib/asm-offsets.c | 14 + cmd/Kconfig | 10 + cmd/Makefile | 2 + cmd/armffa.c | 242 +++ configs/corstone1000_defconfig | 4 + configs/sandbox64_defconfig | 2 + configs/sandbox_defconfig | 2 + doc/arch/arm64.ffa.rst | 207 +++ doc/arch/index.rst | 1 + doc/arch/sandbox.rst | 1 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/firmware/arm-ffa/Kconfig | 36 + drivers/firmware/arm-ffa/Makefile | 7 + drivers/firmware/arm-ffa/arm-ffa-uclass.c | 16 + drivers/firmware/arm-ffa/arm_ffa_prv.h | 201 +++ drivers/firmware/arm-ffa/core.c | 1351 +++++++++++++++++ drivers/firmware/arm-ffa/sandbox.c | 659 ++++++++ .../firmware/arm-ffa/sandbox_arm_ffa_prv.h | 144 ++ include/arm_ffa.h | 93 ++ include/configs/corstone1000.h | 9 + include/dm/uclass-id.h | 4 + include/linux/arm-smccc.h | 43 + include/mm_communication.h | 5 + include/sandbox_arm_ffa.h | 91 ++ include/uuid.h | 8 + lib/efi_loader/Kconfig | 14 +- lib/efi_loader/efi_boottime.c | 15 + lib/efi_loader/efi_variable_tee.c | 264 +++- lib/uuid.c | 64 + test/cmd/Makefile | 2 + test/cmd/armffa.c | 40 + test/dm/Makefile | 2 + test/dm/ffa.c | 394 +++++ 36 files changed, 4008 insertions(+), 6 deletions(-) create mode 100644 cmd/armffa.c create mode 100644 doc/arch/arm64.ffa.rst create mode 100644 drivers/firmware/arm-ffa/Kconfig create mode 100644 drivers/firmware/arm-ffa/Makefile create mode 100644 drivers/firmware/arm-ffa/arm-ffa-uclass.c create mode 100644 drivers/firmware/arm-ffa/arm_ffa_prv.h create mode 100644 drivers/firmware/arm-ffa/core.c create mode 100644 drivers/firmware/arm-ffa/sandbox.c create mode 100644 drivers/firmware/arm-ffa/sandbox_arm_ffa_prv.h create mode 100644 include/arm_ffa.h create mode 100644 include/sandbox_arm_ffa.h create mode 100644 test/cmd/armffa.c create mode 100644 test/dm/ffa.c