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Sat, 14 Nov 2026 11:34:38 -0800 (PST) Received: from sid-dev-env.cgrhrlrrq2nuffriizdlnb1x4b.xx.internal.cloudapp.net ([4.155.54.158]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b1b24938bdsm5093969a91.1.2026.11.14.11.34.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Nov 2026 11:34:38 -0800 (PST) From: Siddharth Chintamaneni To: Peter Huewe , Jarkko Sakkinen Cc: Jason Gunthorpe , Sudeep Holla , Yeoreum Yun , Stuart Yoder , apais@microsoft.com, rlmenge@gmail.com, hargar@linux.microsoft.com, linux-integrity@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Siddharth Chintamaneni Subject: [PATCH v2 0/4] tpm: Cache ACPI TPM2 start method and gate tpm_crb_ffa probe Date: Sat, 14 Nov 2026 19:34:30 +0000 Message-ID: <20261114193434.117714-1-sidchintamaneni@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series caches the ACPI TPM2 start method in tpm_init() and uses the cached tpm2_acpi_start_method value across tpm_crb_ffa, tpm_tis, and tpm_crb. Patch 1 caches the ACPI TPM2 start method once in tpm_init() into tpm2_acpi_start_method (defaulting to ACPI_TPM2_NOT_ALLOWED when absent or invalid). Patch 2 checks tpm2_acpi_start_method in tpm_crb_ffa_probe() and returns -ENODEV unless ACPI advertises ACPI_TPM2_CRB_WITH_ARM_FFA, skipping FF-A probing on non-FF-A platforms while keeping modular tpm_crb/tpm_crb_ffa loading intact. Patches 3 and 4 update tpm_tis and tpm_crb to use the cached tpm2_acpi_start_method value during probe. Changes in v2: - Expand into a 4-patch series caching tpm2_acpi_start_method in tpm_init() and converting tpm_crb_ffa, tpm_tis, and tpm_crb to use it (Jarkko Sakkinen). - Move the tpm_crb_ffa start_method check from module_init into tpm_crb_ffa_probe() so tpm_crb.ko and tpm_crb_ffa.ko still load cleanly on non-FF-A systems when built as modules. v1: https://lore.kernel.org/linux-integrity/20261112233807.70664-1-sidchintamaneni@gmail.com/ Jarkko Sakkinen (1): tpm: Cache TPM2 start method Siddharth Chintamaneni (3): tpm: tpm_crb_ffa: Only probe when ACPI TPM2 uses FF-A tpm: tpm_tis: Use cached tpm2_acpi_start_method tpm: tpm_crb: Use cached tpm2_acpi_start_method drivers/char/tpm/tpm-interface.c | 21 +++++++++++++++++++++ drivers/char/tpm/tpm.h | 1 + drivers/char/tpm/tpm_crb.c | 19 ++++++++++++------- drivers/char/tpm/tpm_crb_ffa.c | 5 +++++ drivers/char/tpm/tpm_tis.c | 18 +++++++----------- 5 files changed, 46 insertions(+), 18 deletions(-) base-commit: 912c3bad2eb993eb3e83c2689cd4e17361ef087f -- 2.45.4