From nobody Sat Feb 7 15:05:56 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4D6852777F3 for ; Sat, 10 Jan 2026 13:48:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768052935; cv=none; b=mhh2+41N3dhmF2CGgB29IIPL1Gyl3CXgsnkiaC11uTgsMitMiTjD+UUh1vTJKHNJqyMNjNAEyfIlGg3SamlqoMPSaz07nxjIGVXg1C7dGO0/tcM0O98EF1HZJvMx6/kSku5z4h5UiG69vAtClY8g6Y1L0G0BVSp2O4GxNHQAHEc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768052935; c=relaxed/simple; bh=DoHviEjbcNLdaHAMUQrjfjLis0nz9xmH/J7b68liDes=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=J/a1YBDXCeXytQpUo/Oh6j8ppugXfmP1jO5qiElFR9fLxviZ0ogLMkioLWsyASbJy+vk/qJ7v+AyQtmTaw+Hqn7AvwpTfKUiOVCm04alrtOl9zuiC1U7P2e5+ferjTJ7GTTkjROEGZFRZ43B6m9sTqupooOc+FEimOedqzQzgg4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YYMq3bW+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YYMq3bW+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68AC9C16AAE; Sat, 10 Jan 2026 13:48:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768052929; bh=DoHviEjbcNLdaHAMUQrjfjLis0nz9xmH/J7b68liDes=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YYMq3bW+dC0ER4zvMFrD2YnoVxx0SYuE/ZHiDYqmVWpiyd9v/soX1q/o23xXI8mN0 veOP42qzwQXgt332VznyKqiNGqFJhIyS2wTTW/epvFbiVMa3HVCD0/1Y7pu4rUEBnA ++rvcphYKYmX6gEb1NYHYhHH0U1IQYvCwZc7tjHXTWfTC66FBuWo1LCtlj9Ff9tJxH t2k9IywGDcZ6B/BIcJECM0ry8hyMQS8S6vuDRgbUTwYdRhuHgwaVe6qCef0yho0YQ1 0/080U49aSKV7TLhk1nD4WalvmK0oN/r3PGFzotA2wMTBIY5pK/UIdP3un1LbcP6xF HRFUSMlSJItWg== From: "Mario Limonciello (AMD)" To: Yazen Ghannam , Jean Delvare Cc: linux-kernel@vger.kernel.org, Borislav Petkov , "Mario Limonciello (AMD)" Subject: [PATCH v3 5/5] firmware: dmi: Read additional information when decoding DMI table Date: Sat, 10 Jan 2026 07:48:34 -0600 Message-ID: <20260110134835.1296600-6-superm1@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260110134835.1296600-1-superm1@kernel.org> References: <20260110134835.1296600-1-superm1@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Type 40 entries (Additional information) are summarized in section 7.41 as part of the SMBIOS specification. These entries aren't all interesting enough to save, but on some AMD Zen systems the AGESA version is stored here and can be useful to save into debugging logs for cross referencing issues when reported. Signed-off-by: Mario Limonciello (AMD) --- v3: * Merge patch to show AGESA version (Jean) * Don't save strings (Jean) * Avoid out of bounds (Jean) --- drivers/firmware/dmi_scan.c | 32 ++++++++++++++++++++++++++++++++ include/linux/dmi.h | 7 +++++++ 2 files changed, 39 insertions(+) diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c index caa09ddf0dfa7..e1125d011d24b 100644 --- a/drivers/firmware/dmi_scan.c +++ b/drivers/firmware/dmi_scan.c @@ -396,6 +396,34 @@ static void __init dmi_save_dev_pciaddr(int instance, = int segment, int bus, list_add(&dev->dev.list, &dmi_devices); } =20 +static void __init dmi_scan_additional(const struct dmi_additional_info *i= nfo) +{ + const u8 *data; + int i; + + if (!info || info->header.length < 5) + return; + + data =3D info->entries; + + for (i =3D 0; i < info->count; i++) { + u8 string_num =3D data[i * 5 + 4]; + const char *string_ptr; + int len; + + string_ptr =3D dmi_string_nosave(&info->header, string_num); + if (!string_ptr || !*string_ptr) + continue; + + len =3D strlen(string_ptr); + if (len =3D=3D 0) + continue; + + if (!strncmp(string_ptr, "AGESA", 5)) + pr_info("%s\n", string_ptr); + } +} + static void __init dmi_save_extended_devices(const struct dmi_header *dm) { const char *name; @@ -529,8 +557,12 @@ static void __init dmi_decode(const struct dmi_header = *dm, void *dummy) case DMI_ENTRY_IPMI_DEV: dmi_save_ipmi_device(dm); break; + case DMI_ENTRY_ADDITIONAL: + dmi_scan_additional((const struct dmi_additional_info *)dm); + break; case DMI_ENTRY_ONBOARD_DEV_EXT: dmi_save_extended_devices(dm); + break; } } =20 diff --git a/include/linux/dmi.h b/include/linux/dmi.h index 2eedf44e68012..4bb1b7882237f 100644 --- a/include/linux/dmi.h +++ b/include/linux/dmi.h @@ -24,6 +24,7 @@ enum dmi_device_type { DMI_DEV_TYPE_OEM_STRING =3D -2, DMI_DEV_TYPE_DEV_ONBOARD =3D -3, DMI_DEV_TYPE_DEV_SLOT =3D -4, + DMI_DEV_TYPE_ADDITIONAL =3D -5, }; =20 enum dmi_entry_type { @@ -91,6 +92,12 @@ struct dmi_device { void *device_data; /* Type specific data */ }; =20 +struct dmi_additional_info { + struct dmi_header header; + u8 count; + u8 entries[]; +} __packed; + #ifdef CONFIG_DMI =20 struct dmi_dev_onboard { --=20 2.43.0