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Sat, 14 Nov 2026 11:34:40 -0800 (PST) Received: from sid-dev-env.cgrhrlrrq2nuffriizdlnb1x4b.xx.internal.cloudapp.net ([4.155.54.158]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b1b24938bdsm5093969a91.1.2026.11.14.11.34.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Nov 2026 11:34:39 -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 1/4] tpm: Cache TPM2 start method Date: Sat, 14 Nov 2026 19:34:31 +0000 Message-ID: <20261114193434.117714-2-sidchintamaneni@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261114193434.117714-1-sidchintamaneni@gmail.com> References: <20261114193434.117714-1-sidchintamaneni@gmail.com> X-Mailing-List: linux-integrity@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 From: Jarkko Sakkinen Both tpm_tis and tpm_crb retrieve the start method from the ACPI TPM2 table during device probe, and tpm_crb_ffa also needs it before chip allocation. Cache the start method in tpm2_acpi_start_method during tpm_init() and export it for the leaf drivers, defaulting to ACPI_TPM2_NOT_ALLOWED when the table is absent or invalid. Signed-off-by: Jarkko Sakkinen Co-developed-by: Siddharth Chintamaneni Signed-off-by: Siddharth Chintamaneni --- drivers/char/tpm/tpm-interface.c | 21 +++++++++++++++++++++ drivers/char/tpm/tpm.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index e0385b16616b..7b7da79bee7c 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -534,8 +534,17 @@ int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max) } EXPORT_SYMBOL_GPL(tpm_get_random); +#ifdef CONFIG_ACPI +u32 tpm2_acpi_start_method = ACPI_TPM2_NOT_ALLOWED; +EXPORT_SYMBOL_GPL(tpm2_acpi_start_method); +#endif + static int __init tpm_init(void) { +#ifdef CONFIG_ACPI + struct acpi_table_tpm2 *tbl; + acpi_status status; +#endif int rc; rc = class_register(&tpm_class); @@ -562,6 +571,18 @@ static int __init tpm_init(void) goto out_unreg_chrdev; } +#ifdef CONFIG_ACPI + if (!acpi_disabled) { + status = acpi_get_table(ACPI_SIG_TPM2, 1, + (struct acpi_table_header **)&tbl); + if (ACPI_SUCCESS(status)) { + if (tbl->header.length >= sizeof(*tbl)) + tpm2_acpi_start_method = tbl->start_method; + acpi_put_table((struct acpi_table_header *)tbl); + } + } +#endif + return 0; out_unreg_chrdev: diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index fa554c5ad80b..212ca2410c93 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -100,6 +100,7 @@ void tpm_sysfs_add_device(struct tpm_chip *chip); #ifdef CONFIG_ACPI +extern u32 tpm2_acpi_start_method; extern void tpm_add_ppi(struct tpm_chip *chip); #else static inline void tpm_add_ppi(struct tpm_chip *chip) -- 2.45.4