Merge tag 'acpi-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI updates from Rafael Wysocki:
 "These update the ACPICA code in the kernel to upstream revision
  20210105, fix and clean up the handling of device properties, add
  support for setting global profile of the platform, clean up device
  enumeration, the CPPC library, the APEI support and more, update the
  documentation, consolidate the printing of messages in several places
  and make assorted janitorial changes.

  Specifics:

   - Update ACPICA code in the kernel to upstream revision 20201113 with
     changes as follows:

      * Remove the MTMR (Mid-Timer) table (Al Stone).
      * Remove the VRTC table (Al Stone).
      * Add type casts for string functions (Bob Moore).
      * Update all copyrights to 2021 (Bob Moore).
      * Fix exception code class checks (Maximilian Luz).
      * Clean up exception code class checks (Maximilian Luz).
      * Fix -Wfallthrough (Nick Desaulniers).

   - Add support for setting and reading global profile of the platform
     along with documentation (Mark Pearson, Hans de Goede, Jiaxun
     Yang).

   - Fix fwnode properties matching and clean up the code handling
     device properties and its documentation (Rafael Wysocki, Andy
     Shevchenko).

   - Clean up ACPI-based device enumeration code (Rafael Wysocki).

   - Clean up the CPPC support library code (Ionela Voinescu).

   - Clean up the APEI support code (Yang Li, Yazen Ghannam).

   - Update GPIO-related properties documentation (Flavio Suligoi).

   - Consolidate and clean up the printing of messages in several places
     (Rafael Wysocki).

   - Fix error code path in configfs handling code (Qinglang Miao).

   - Use DEVICE_ATTR_<RW|RO|WO> macros where applicable (Dwaipayan Ray).

   - Replace tests for !ACPI_FAILURE with tests for ACPI_SUCCESS in
     multiple places (Bjorn Helgaas)"

* tag 'acpi-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (44 commits)
  ACPI: property: Satisfy kernel doc validator (part 2)
  ACPI: property: Satisfy kernel doc validator (part 1)
  ACPI: property: Make acpi_node_prop_read() static
  ACPI: property: Remove dead code
  ACPI: property: Fix fwnode string properties matching
  ACPI: OSL: Clean up printing messages
  ACPI: OSL: Rework acpi_check_resource_conflict()
  ACPI: APEI: ERST: remove unneeded semicolon
  ACPI: thermal: Clean up printing messages
  ACPI: video: Clean up printing messages
  ACPI: button: Clean up printing messages
  ACPI: battery: Clean up printing messages
  ACPI: AC: Clean up printing messages
  ACPI: bus: Drop ACPI_BUS_COMPONENT which is not used any more
  ACPI: utils: Clean up printing messages
  ACPI: scan: Clean up printing messages
  ACPI: bus: Clean up printing messages
  ACPI: PM: Clean up printing messages
  ACPI: power: Clean up printing messages
  ACPI: APEI: Add is_generic_error() to identify GHES sources
  ...

2 files changed, 43 insertions, 0 deletions

diff --git a/Documentation/userspace-api/index.rst b/Documentation/userspace-api/index.rst
index acd2cc2a538d..d29b020e5622 100644
--- a/Documentation/userspace-api/index.rst
+++ b/Documentation/userspace-api/index.rst
@@ -24,6 +24,7 @@ place where this information is gathered.
    ioctl/index
    iommu
    media/index
+   sysfs-platform_profile
 
 .. only::  subproject and html
 
diff --git a/Documentation/userspace-api/sysfs-platform_profile.rst b/Documentation/userspace-api/sysfs-platform_profile.rst
new file mode 100644
index 000000000000..c33a71263d9e
--- /dev/null
+++ b/Documentation/userspace-api/sysfs-platform_profile.rst
@@ -0,0 +1,42 @@
+=====================================================================
+Platform Profile Selection (e.g. /sys/firmware/acpi/platform_profile)
+=====================================================================
+
+On modern systems the platform performance, temperature, fan and other
+hardware related characteristics are often dynamically configurable. The
+platform configuration is often automatically adjusted to the current
+conditions by some automatic mechanism (which may very well live outside
+the kernel).
+
+These auto platform adjustment mechanisms often can be configured with
+one of several platform profiles, with either a bias towards low power
+operation or towards performance.
+
+The purpose of the platform_profile attribute is to offer a generic sysfs
+API for selecting the platform profile of these automatic mechanisms.
+
+Note that this API is only for selecting the platform profile, it is
+NOT a goal of this API to allow monitoring the resulting performance
+characteristics. Monitoring performance is best done with device/vendor
+specific tools such as e.g. turbostat.
+
+Specifically when selecting a high performance profile the actual achieved
+performance may be limited by various factors such as: the heat generated
+by other components, room temperature, free air flow at the bottom of a
+laptop, etc. It is explicitly NOT a goal of this API to let userspace know
+about any sub-optimal conditions which are impeding reaching the requested
+performance level.
+
+Since numbers on their own cannot represent the multiple variables that a
+profile will adjust (power consumption, heat generation, etc) this API
+uses strings to describe the various profiles. To make sure that userspace
+gets a consistent experience the sysfs-platform_profile ABI document defines
+a fixed set of profile names. Drivers *must* map their internal profile
+representation onto this fixed set.
+
+If there is no good match when mapping then a new profile name may be
+added. Drivers which wish to introduce new profile names must:
+
+ 1. Explain why the existing profile names canot be used.
+ 2. Add the new profile name, along with a clear description of the
+    expected behaviour, to the sysfs-platform_profile ABI documentation.