From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.216.54 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794684881; b=j29SjjeT1Hc4YePEF065VrlsB0GklyPxhGBH1AMGhVOMcdT37ixXd9pN9zXzAFcy2v5R 18BdbjJKP0uoas8qU84g5MqFVa1meLPDYWzeQgZv7/dHpdSucfgKjvL6L8REs58Yikg0P 65aVQd+EMcTRKsD1/pF1778fmy9KDdRq4H42nePTsmzanoSv10lz4tIKxdSd8OtyFRFSr OoEWqbUH6jF3FWkl9ACJBjs2C7fX9G1Q0rIEEYlFpkdnQYatVwnuS1lmnu87DjQ8aNNF0 Ru8WK7Sh2Pct0zN+K6WRlCNJxdViPzfMT+1EHGR1orlDE8zg7z1qu16ZFB/yRHTaWMQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794684881; 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=9ar4Opp2H1k6OcNUZh0cDsgFhCHm2e923NlD+vqOgvM=; b=Kn6X9OeojShBtui0K+zawlCNpEj22x4+09Ww4YA48VrxpRnsoptQsJOUu4/eYYu/I43p IDA9RJtmyXBMqOBnM5OVZfYIR1DIK2da2C70jCLIYc2jrNh7GoUCz9vktKDiBX8uItIA1 25ChKrzOKVPSGmF4w5MwUAn1Cygqy66AZj7JdZdbDMRhHAaWf8KndCM2lfMXhxYrsRdwX 668Y49/znRoSKXvk1sFdTA4Gr+iEXZ+2VS5+DCK9qqfh0juyvxjZSXzZFMZ04uJV4L1kw URfDwOW5av98gLC0PVlWk2/ZmzT3XXqmiIspo+ZvVtL/sjV9s/ANk0YG0YfCtV342Mw== 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=epLbi5iJ; arc=none smtp.remote-ip=209.85.216.54 Received: from mail-pj1-f54.google.com (mail-pj1-f54.google.com [209.85.216.54]) (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 AEF13606A336 for ; Sat, 14 Nov 2026 19:34:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org AEF13606A336 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=epLbi5iJ Received: by mail-pj1-f54.google.com with SMTP id 98e67ed59e1d1-3b0d09df973so2935027a91.0 for ; Sat, 14 Nov 2026 11:34:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1794684880; x=1795289680; 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=9ar4Opp2H1k6OcNUZh0cDsgFhCHm2e923NlD+vqOgvM=; b=epLbi5iJdzMB05sfV7Gtp3qf/9N2YK034SUivD9cDXtjgeYKCwAezyizQi+hKIQSdz ZO+La2Wr77teoodUhLzZFpdxS+PcrDxD5DpdD/rE0/tAmzyFYIaL4UN7dINsfDh2oucA xJKJ3tFf/aUsq5lZ1eHHqFy0y5jTDXgzf/SgCtqVgcMMhvcsO1GdAcV/97xpYJsFpRu2 r4U1XPHlH819WbBA5k7IIGwg6iB5xYSnDQId5eGcaGxBrGkAgV8ILTcWVREi4lfB7Q30 j/FxUSTG744TR0RWnh5eTef4H/w4CD1bU8bkCOR5RJo8DNymxgUmc1XWXMgtcurLu17n jr2Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1794684880; x=1795289680; 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=9ar4Opp2H1k6OcNUZh0cDsgFhCHm2e923NlD+vqOgvM=; b=dVR6zjFvPJwW9IPTQq5Bt+ZuMRykmWtcVdAvmWAvGkBcK4NzewJ3f5GBD1Tk/+/Q74 emVIxUSvTW9lU3qQJK529J0t6aTkGDnPovj/vboocFMW0txDqln8asisCcS+aSY6z+XG znXmbJAlja0zF2bUIR9ZGBFmRd7Itb21da88f++HpazprqJbuOEND/YuRmSwLF5i+mdw Um/sowe51qSh1LBhPbLh5Zpt73i9ON/NHY842TsoAXDrY2iOdlduts3TUU6z6GrmVKlw MsTNMbFVeYuuTi0/H/tmpMif6Kpqy55a5EsfjhC4Q9E/pmgO4G0TDhkSKmd7Tgjtf4xJ DNjA== X-Forwarded-Encrypted: i=1; AL+hErFaEfneSBpnlhakKyOp7LEm0fvnd6VaYtkuLecZMEn3Z9Bb6aEiNwwPF/3pnupmCTw8ZYz0v58oBZYmPdM=@vger.kernel.org X-Gm-Message-State: APuU4Z8ADgcWeG9D5AAweSLsOnOVceHicGThTAXzy2sTnvHxMKcm1MiH XH6f/Q0FA9uDHi7kEu/nDyl5bRyqI1qSuHAqfe2WuKLLVWPA2AXHa1cW X-Gm-Gg: AYBFou03XSv06m0fPduL9D0hcGLxrPIPmxWLYPO7KdLJblNEGVd+0EmB3axK2brrYIK 46p4rL0gOC/NOag8N05DcqEh8hQ5WS1izfn1LnmnzcdnKSMBLXSZWgbSv8+jXLjJhrDrwiKSOm8 FAAmlXhgAf5BFdsW7ZUYdY09UR2oLhiiGdlVM0vdiFZZ9Gx1aFhyrSS//9DcHsUFebtQ5SQcmWu juk8HTYPrlug3fh0/FdeJWeHtEqcHs0f0nJKTGdlT12tGPZ1WqQiw81uzH5Gl5CJTmaLOJozjF1 WOZmFs0gyp/hKVmcDfhQUUgT4AGDYZq+8KILChGOZaL9/f8XhzFtS2rGjnSHoF0uJLmm9q/DKii oD7ZOhwjbr2qfAHNN+5X/JeztBCtSa43VmQVt7B8yKUh2zRWufT098N7QKDtdgXcaVU3ruCByQt wKcxTPA6NEuHNaPyfGeEe2HXa5i8BA+Wb21u3Ltuj84EF5AnQ6BF3CX3+euclBjp6QrR1hZMGc/ Q2v/A4y89MtlFCYiKffbPBucPke/rfe12238LdFJYdMjaF4X+RaQ7mDmIWpdRHeY4OTLnh2zv4+ DgTqnvUb2VFqRUtaI8IXbxXZDBQkCC/MzZ0qhDAyZ7mN/NYzQdDubSt7GaifD9X3iHV/HPuk5RB OOvZe5oMH5R7V5FtiZ9s8PZQT5b6ANCwSHPXWxMhdsczfKgDxyvjOvzVJ6BT5o6fbi3wPem7Phl wujiyZj09r+oeMwgxgUSYubiN2WSCzAdoOEmiDQmn6KPex2jxCuV1HQNzVNzeTQw== X-Received: by 2002:a17:90a:c88b:b0:3ac:3588:b548 with SMTP id 98e67ed59e1d1-3b1b09e69c6mr6471730a91.13.1794684880041; 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-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() 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