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Wysocki" Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org Subject: [PATCH 1/2] firmware: Add boot information sysfs Date: Tue, 1 Feb 2022 15:35:00 +1030 Message-Id: <20220201050501.182961-2-joel@jms.id.au> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220201050501.182961-1-joel@jms.id.au> References: <20220201050501.182961-1-joel@jms.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Machines often have firmware that perform some action before Linux is loaded. It's useful to know how this firmware is configured, so create a sysfs directory and some example properties that a system can choose to expose to describe how the system was started. Currently the intended use describes five files, relating to hardware root of trust configuration. Signed-off-by: Joel Stanley --- .../ABI/testing/sysfs-firmware-bootinfo | 43 +++++++++++++++++++ drivers/base/firmware.c | 14 ++++++ include/linux/firmware_bootinfo.h | 8 ++++ 3 files changed, 65 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-firmware-bootinfo create mode 100644 include/linux/firmware_bootinfo.h diff --git a/Documentation/ABI/testing/sysfs-firmware-bootinfo b/Documentation/ABI/testing/sysfs-firmware-bootinfo new file mode 100644 index 000000000000..cd6c42316345 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-firmware-bootinfo @@ -0,0 +1,43 @@ +What: /sys/firmware/bootinfo/* +Date: Jan 2022 +Description: + A system can expose information about how it was started in + this directory. + + This information is agnostic as to the firmware implementation. + + A system may expose a subset of these properties as applicable. + + +What: /sys/firmware/bootinfo/secure_boot +Date: Jan 2022 +Description: + Indicates the system was started with secure boot enabled in + the firmware. + + +What: /sys/firmware/bootinfo/abr_image +Date: Jan 2022 +Description: + Indicates the system was started from the alternate image + loaded from an Alternate Boot Region. Often this is a result of + the primary firmware image failing to start the system. + + +What: /sys/firmware/bootinfo/low_security_key +Date: Jan 2022 +Description: + Indicates the system's secure boot was verified with a low + security or development key. + +What: /sys/firmware/bootinfo/otp_protected +Date: Jan 2022 +Description: + Indicates the system's boot configuration region is write + protected and cannot be modified. + +What: /sys/firmware/bootinfo/uart_boot +Date: Jan 2022 +Description: + Indicates the system firmware was loaded from a UART instead of + an internal boot device. diff --git a/drivers/base/firmware.c b/drivers/base/firmware.c index 8dff940e0db9..2a6478aa178d 100644 --- a/drivers/base/firmware.c +++ b/drivers/base/firmware.c @@ -11,6 +11,7 @@ #include #include #include +#include #include "base.h" @@ -24,3 +25,16 @@ int __init firmware_init(void) return -ENOMEM; return 0; } + +/* + * Exposes attributes documented in Documentation/ABI/testing/sysfs-firmware-bootinfo + */ +int __init firmware_bootinfo_init(const struct attribute_group *attr_group) +{ + struct kobject *kobj= kobject_create_and_add("bootinfo", firmware_kobj); + if (!kobj) + return -ENOMEM; + + return sysfs_create_group(kobj, attr_group); +} +EXPORT_SYMBOL_GPL(firmware_bootinfo_init); diff --git a/include/linux/firmware_bootinfo.h b/include/linux/firmware_bootinfo.h new file mode 100644 index 000000000000..581b68508ec8 --- /dev/null +++ b/include/linux/firmware_bootinfo.h @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// Copyright 2022 IBM Corp + +#include +#include + +int __init firmware_bootinfo_init(const struct attribute_group *attr_group); + -- 2.34.1