On Mon, Mar 10, 2025 at 01:19:37PM +0200, Jarkko Sakkinen wrote: > On Wed, Mar 05, 2025 at 11:36:06AM -0600, Stuart Yoder wrote: > > 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 6 > > -in tpm_crb removed unnecessary brackets from if statement and > > fixed comment style > > -noticed and fixed bug in patch 2, polarity of return value > > from tpm_crb_has_idle() was wrong and wasn't caught in past > > testing > > -added Reviewed-by tag to patches 2 and 5 > > > > Version 5 > > -tpm_ffa_crb patch: removed module version > > -tpm_ffa_crb patch: fixed module description > > -tpm_ffa_crb patch: updated comment on mutex declaration > > -reworded commit message for patch 2 as per Jarkko's > > suggestion > > -added Acked tag by Sudeep to patch 1 for FF-A changes > > -added Reviewed-by tag to patches 3 and 4 > > > > Version 4 > > -fix warning from kernel test robot in patch 1 > > -fix warnings from checkpatch.pl --strict > > -clean up unnecessary parenthesis usage > > -update variable declaration to be reverse tree order > > -document exported functions in tpm_crb_ffa driver > > -remove unnecessary author and maintainer info in tpm_crb_ffa driver > > -fix declaration of variables to be in reverse tree order > > > > Version 3 > > -changed prefixes used throughout patch series to tpm_crb_ffa* > > > > 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: clean-up and refactor check for idle support > > 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 | 105 +++++-- > > drivers/char/tpm/tpm_crb_ffa.c | 348 +++++++++++++++++++++ > > drivers/char/tpm/tpm_crb_ffa.h | 25 ++ > > include/acpi/actbl3.h | 1 + > > 7 files changed, 535 insertions(+), 19 deletions(-) > > create mode 100644 Documentation/security/tpm/tpm_ffa_crb.rst > > create mode 100644 drivers/char/tpm/tpm_crb_ffa.c > > create mode 100644 drivers/char/tpm/tpm_crb_ffa.h > > > > -- > > 2.34.1 > > > > Check this out: > > https://web.git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git/log/ > It is good to get a nod for ACPICA from Rafael as this is not the usual pattern. It deviates from normal procedure for ACPICA changes. -- Regards, Sudeep
