Firmware Framework for Arm A-profile (FF-A) is a messaging framework for Arm-based systems, and in the context of the TPM CRB driver is used to signal 'start' to a CRB-based TPM service which is hosted in an FF-A secure partition running in TrustZone. These patches add support for the CRB FF-A start method defined in the TCG ACPI specification v1.4 and the FF-A ABI defined in the Arm TPM Service CRB over FF-A (DEN0138) specification: https://developer.arm.com/documentation/den0138/latest/ The first patch adds an FF-A driver to handle the FF-A messaging when communicating with a CRB-based TPM secure partition built on FF-A. The driver is probed when the TPM secure partition is discovered by the Linux FF-A infrastructure. The second patch consolidates the check for idle support in the CRB driver to one place. The third patch defines the new ACPI start method enumeration for CRB over FF-A. The fourth patch adds support for the FF-A ACPI start method to the TPM crb driver. The fifth patch adds documentation explaining how the CRB driver and FF-A relate. Version 2 -updates to cover letter to define FF-A -added new patch with documentation -created pull request in ACPIA and added link to the patch updating actbl3.h -added tpm_ prefix to the FF-A CRB driver Stuart Yoder (5): tpm_crb: implement driver compliant to CRB over FF-A tpm_crb: refactor check for idle support into TPM into inline function ACPICA: add start method for Arm FF-A tpm_crb: add support for the Arm FF-A start method Documentation: tpm: add documentation for the CRB FF-A interface Documentation/security/tpm/tpm_ffa_crb.rst | 65 +++++ drivers/char/tpm/Kconfig | 9 + drivers/char/tpm/Makefile | 1 + drivers/char/tpm/tpm_crb.c | 81 +++++- drivers/char/tpm/tpm_ffa_crb.c | 310 +++++++++++++++++++++ drivers/char/tpm/tpm_ffa_crb.h | 30 ++ include/acpi/actbl3.h | 1 + 7 files changed, 491 insertions(+), 6 deletions(-) create mode 100644 Documentation/security/tpm/tpm_ffa_crb.rst create mode 100644 drivers/char/tpm/tpm_ffa_crb.c create mode 100644 drivers/char/tpm/tpm_ffa_crb.h -- 2.34.1
