On Fri, Aug 04, 2023 at 02:33:36PM +0100, Abdellatif El Khlifi wrote: > Adding support for Arm FF-A v1.0 (Arm Firmware Framework for Armv8-A) [A]. > > FF-A specifies interfaces that enable a pair of software execution > environments aka partitions to > communicate with each other. A partition could be a VM in the Normal or > Secure world, an > application in S-EL0, or a Trusted OS in S-EL1. > > FF-A is a discoverable bus and similar to architecture features. > FF-A bus is discovered using ARM_SMCCC_FEATURES mechanism performed > by the PSCI driver. > > => dm tree > > Class Index Probed Driver Name > ----------------------------------------------------------- > ... > firmware 0 [ + ] psci |-- psci > ffa 0 [ ] arm_ffa | `-- arm_ffa > ... > > Clients are able to probe then use the FF-A bus by calling the DM class > searching APIs (e.g: uclass_first_device). > > This implementation of the specification provides support for Aarch64. > > 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 > - FF-A support can be compiled and used without EFI > - Support for SMCCCv1.2 x0-x17 registers > - Support for SMC32 calling convention > - Support for 32-bit and 64-bit FF-A direct messaging > - Support for FF-A MM communication (compatible with EFI boot time) > - Enabling FF-A and MM communication in Corstone1000 platform as a use > case > - A Uclass driver providing generic FF-A methods. > - An Arm FF-A device driver providing Arm-specific methods and reusing > the Uclass methods. > - A sandbox emulator for Arm FF-A, emulates the FF-A side of the Secure > World and provides > FF-A ABIs inspection methods. > - An FF-A sandbox device driver for FF-A communication with the emulated > Secure World. > The driver leverages the FF-A Uclass to establish FF-A communication. > - Sandbox FF-A test cases. > - A new command called armffa is provided as an example of how to access > the > FF-A bus > > For more details about the FF-A support please refer to [B] and refer to [C] > for > how to use the armffa command. > > Please find at [D] 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.
Depending on further feedback, I will pick this up but likely just after -rc2. Given how long this has been going I will take it for v2023.10 all the same, thanks. -- Tom
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