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Sat, 14 Nov 2026 17:35:00 -0800 (PST) Received: from sid-dev-env.cgrhrlrrq2nuffriizdlnb1x4b.xx.internal.cloudapp.net ([4.155.54.158]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ee0f75dde9sm23671935ad.22.2026.11.14.17.34.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Nov 2026 17:35:00 -0800 (PST) From: Siddharth Chintamaneni To: Peter Huewe , Jarkko Sakkinen Cc: Jason Gunthorpe , Sudeep Holla , Yeoreum Yun , Stuart Yoder , apais@microsoft.com, rachelmenge@linux.microsoft.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 v3 1/4] tpm: Cache TPM2 start method Date: Sun, 15 Nov 2026 01:34:53 +0000 Message-ID: <20261115013456.212141-2-sidchintamaneni@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261115013456.212141-1-sidchintamaneni@gmail.com> References: <20261115013456.212141-1-sidchintamaneni@gmail.com> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261114_173501_647121_04048102 X-CRM114-Status: GOOD ( 13.69 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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(), log it when a TPM2 ACPI table is present, 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..c18b060d7da2 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, (typeof(tbl->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); + pr_info("tpm: TPM2 ACPI start method: 0x%02x\n", tpm2_acpi_start_method); + } + } +#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) base-commit: 7e52fc165aa50e70e8df3c879d04fc0ff1673d4a -- 2.45.4