linux-kernel - [PATCH v2 0/5] Introduce Platform Firmware Runtime Update and Telemetry drivers

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Date:   Tue, 14 Sep 2021 15:24:25 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     linux-acpi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Aubrey Li <aubrey.li@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Chen Yu <yu.c.chen@...el.com>,
        Mike Rapoport <rppt@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH v2 0/5] Introduce Platform Firmware Runtime Update and Telemetry drivers

High Service Level Agreements (SLAs) requires that the system runs without
service interruptions. Generally, system firmware provides runtime services
such as RAS(Reliability, Availability and Serviceability) features, UEFI runtime
services and ACPI services. Currently if there is any firmware code changes in
these code area, the system firmware update and reboot is required. Example of
bug fix could be wrong register size or location of the register. This means
customer services are not available during the firmware upgrade, which could
approach several minutes, resulting in not able to meet SLAs.

Intel provides a mechanism named Management Mode Runtime Update to help the users
update the firmware without having to reboot[1].

This series provides the following facilities.

  1. Perform a runtime firmware driver update and activate.
  2. Ability to inject firmware code at runtime, for dynamic instrumentation.
  3. Facility to retrieve logs from runtime firmware update and activate telemetry.
     (The telemetry is based on runtime firmware update: it records the logs during
      runtime update(code injection and driver update).

The Management Mode Runtime Update OS Interface Specification[1] provides two ACPI
device objects to interface with system firmware to perform these updates. This patch
series introduces the drivers for those ACPI devices.

[1] https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf

Chen Yu (5):
  Documentation: Introduce Platform Firmware Runtime Update
    documentation
  efi: Introduce EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER and
    corresponding structures
  drivers/acpi: Introduce Platform Firmware Runtime Update device driver
  drivers/acpi: Introduce Platform Firmware Runtime Update Telemetry
  selftests/pfru: add test for Platform Firmware Runtime Update and
    Telemetry

 .../userspace-api/ioctl/ioctl-number.rst      |   1 +
 Documentation/x86/index.rst                   |   1 +
 Documentation/x86/pfru.rst                    | 100 +++
 drivers/acpi/Kconfig                          |   1 +
 drivers/acpi/Makefile                         |   1 +
 drivers/acpi/pfru/Kconfig                     |  29 +
 drivers/acpi/pfru/Makefile                    |   3 +
 drivers/acpi/pfru/pfru_telemetry.c            | 412 +++++++++++++
 drivers/acpi/pfru/pfru_update.c               | 567 ++++++++++++++++++
 include/linux/efi.h                           |  50 ++
 include/uapi/linux/pfru.h                     | 151 +++++
 tools/testing/selftests/Makefile              |   1 +
 tools/testing/selftests/pfru/Makefile         |   7 +
 tools/testing/selftests/pfru/config           |   2 +
 tools/testing/selftests/pfru/pfru_test.c      | 329 ++++++++++
 15 files changed, 1655 insertions(+)
 create mode 100644 Documentation/x86/pfru.rst
 create mode 100644 drivers/acpi/pfru/Kconfig
 create mode 100644 drivers/acpi/pfru/Makefile
 create mode 100644 drivers/acpi/pfru/pfru_telemetry.c
 create mode 100644 drivers/acpi/pfru/pfru_update.c
 create mode 100644 include/uapi/linux/pfru.h
 create mode 100644 tools/testing/selftests/pfru/Makefile
 create mode 100644 tools/testing/selftests/pfru/config
 create mode 100644 tools/testing/selftests/pfru/pfru_test.c

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2.25.1