From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.214.176 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794706501; b=2t01IIT8kuiTc4utscEFs63LWfFLD2+qi1djaeMxw0sl6uNUEmuVIjiIVRE80YAAq2IX 2/37/82D4kCs4AQRBP1CBT5K2VzBfHcjUSqTNhgHwoti5dl3D6AJ4Ue02diHYTanExmKB HlWIo0W/vXgMqiqyzLEaFJtlkndqXi81KaSdNvYpMA/B1vSw9aO5nkHVyzjA11B3BA993 haMNKjoRYpX2K2e1ApZZrv2oW3IijSQvwTOIevfUZGu+qMMCtBEJ6/JYPWoyYSd0WOGzI 7UYPqfUj/iWB2++cHBHMr2SUaAzsOK3ABvXqz2Jlkl4LQtrpPgd1biOCdfozDlk490w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794706501; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received:Received: From:To:Cc:Subject:Date:Message-ID:X-Mailer:In-Reply-To:References: MIME-Version:Content-Transfer-Encoding; bh=CRGAUvOGM7cXeBiNifNubn0WANT9Nl+imZXj5mUQRV4=; b=AmKidPXl/wSu9cSob7T5L+PN9ehIX6U8r5r2K82thCo7svNcmRhskelsA+s/FKmeB8+M TyMY6HGAPysZqo2O9JE8NWkhdvSChFoZzsAaklIAs6VtqQHum9kzwvTtYekZLMsj77EzR pwLTV9XOCZhJA1LBcADdFZEJRQ+NLD0e34z1jZbeWhEu8YMVGDrEztzdsPg80KmNb9F6f Xl8fbaxHmxoSQaw2pcS8JZLGcb1enzFPr8h6Hpy5iH2GuB2C6dnSFKfTLQu7Y35+74pYL lBQfBrpjN26OfLamX4uQfFjhi6oBn0S1D9qNwaMOIVOvK74MFx+pmeN8QXDRdUMu7yw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=L7Z9GksH; arc=none smtp.remote-ip=209.85.214.176 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5A118606A882 for ; Sun, 15 Nov 2026 01:35:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 5A118606A882 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=L7Z9GksH Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-2e95bd1c14cso32204625ad.2 for ; Sat, 14 Nov 2026 17:35:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1794706501; x=1795311301; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=CRGAUvOGM7cXeBiNifNubn0WANT9Nl+imZXj5mUQRV4=; b=L7Z9GksHVQp6Gvhb1y7Dp1+wrzgzxQeF609lfKbG8erVBH8cWqLDDYDQ+LCpK/PpMe eFLIUVzl0Dt6RBXN01kpQO/iyjLHhudWnfNpLN01Bk6f+0DOlzg7sJUDzeeD9byT0vnL 2b0CgqzT1w3QRw70UtYWIMcxpJRassQU4JXxwjnRjw+LhfrZ6aV6WPpfpvA3H17+fCgY Z+Wqp3cZHgmjZ/VsLwiuDvmhotmDocgHyC9tnp6pjKdbeZgsMyDX/5go7INkFwuz8sjR SR8LZ+RvnCS6vfvIhD8JIMx4nu6978l0bLUxsYg251DBDzzQSOy6gB+QUIVsW0PW1B0b 0Ssw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1794706501; x=1795311301; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=CRGAUvOGM7cXeBiNifNubn0WANT9Nl+imZXj5mUQRV4=; b=UGjXzJrbxsjN0D+d/zyVn9mfsXrWOgld8GF9GAWMG82mulr32V5JLZ9+0kf7RrY0Ci Df+PMvGVnrhNRXLR+pvGBHrf9Yo+0eFrzQUiNonmLBAcjTZ8TCMT/q6CsddgZfqyXtpe DHGvTD3FQKgZ184cLxKKE33WO8G9KtxzxINpHBJ5dNjH5UwbfPMppSl+7FkVYjgDm/bq oqsuieYPekKyhAadzckkyUNEX3WbCR1Af6Rwauxibg1aM0KuZOOEdvSbd9TmRCrLNQmQ acRB2CzH/rOLrK6JTjhHrIIbGOkx0Mol6wjVCnhot+5bJlusV+6ADnHz9Q58aj1UkjE6 +zWA== X-Forwarded-Encrypted: i=1; AL+hErFc+MVqIomw6dAo9kSefezFVsXN33K9lvCn8YvMohmFHetlDy4egCHup0hUwnFUrpdG1ngaPvGW0YjCdJw=@vger.kernel.org X-Gm-Message-State: APuU4Z8wHTDLIIzyHzHuH70GoUor6J5YnrkB/0PcpnLJZ8fYAYtRnOAz /M/KnsgM9G5NtsSqjJV4FikVvTUNSZoOFxH2oFkrpqlQTKQTvdq640Lk X-Gm-Gg: AYBFou1p8dJdikJh3BbNSu9qeBufeSjY4rEOz2jsXsn0SScooZLRfN7V1KOClDEgNm2 qTQ7DI8yT2ClxABsUtKb7LCQ4Sbjhv/jKQXgG0MBSo0K1JVVRgV41qByZkAz9wToyVr2ou9fMBA 6r40OoKqSLwsQ2YpwI3Ze522hLVMC8kQwDmVjxDkG5wkJqib8cHl/8zKzVjBxgWQYB01pvEd+N7 2Cn5VBI2M95zREEPr5xxzlBRohY4+1D5HF8/YzFmsj8yDOKObp8bmXQrqChyfsteKv6+d3/GzOk xB0tlc+kDwB1BR8Xy09RCz/VJkl5IjIq+1dMNTSKGnChbnfPId92eebFP6V8lv1rM6epn/rzQiV 6NU+aXjCvTsqSmahKii/qi0sGCwkMZiaealLWwuQGjRjfKHR3FbxoZXG/l4WDbUTz/rv/hxy+v+ vyKvwyzkIHv35HTWk56SVUA+yJUrfuGwPYPWCYsJ2v+73o7Sawzm0xJCM6UJyZZGYCy5xGQcJZk kPVnjTK4Q/x5BWIgi/iOPEHtxi/52nabW/L4nDJakar9Lo5z5h6I1OHaxTD7qOFhZfIGj5lx1Ew wP0L5RV35DQziq1Ht4mUwmkAr23atKsysJPt8IRU/7vz8RkHtNLxe1tP/lr6Ro4wRi2WKCIaEN6 eJ12RzWa5wYiLmrLN1cLpX2kWKwD4PpNOvzw8eDj2sblExYo7aDmIEPzOrn/qEWRegKzd0MpIUg sMcR4i9jJvqE3ooQc5Qx0Yv7JxPBMDtmwTyCG06fxnf1+oHz3TE7h+uwuf1g212w== X-Received: by 2002:a17:902:e5c9:b0:2ed:84c6:5d5 with SMTP id d9443c01a7336-2ee0de3e85emr70675995ad.42.1794706500714; 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-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 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