Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 114 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-firmware-dmi-entries b/Documentation/ABI/testing/sysfs-firmware-dmi-entries
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+What:		/sys/firmware/dmi/entries/
+Date:		February 2011
+Contact:	Mike Waychison <mikew@google.com>
+Description:
+		Many machines' firmware (x86 and ia64) export DMI /
+		SMBIOS tables to the operating system.  Getting at this
+		information is often valuable to userland, especially in
+		cases where there are OEM extensions used.
+
+		The kernel itself does not rely on the majority of the
+		information in these tables being correct.  It equally
+		cannot ensure that the data as exported to userland is
+		without error either.
+
+		DMI is structured as a large table of entries, where
+		each entry has a common header indicating the type and
+		length of the entry, as well as a firmware-provided
+		'handle' that is supposed to be unique amongst all
+		entries.
+
+		Some entries are required by the specification, but many
+		others are optional.  In general though, users should
+		never expect to find a specific entry type on their
+		system unless they know for certain what their firmware
+		is doing.  Machine to machine experiences will vary.
+
+		Multiple entries of the same type are allowed.  In order
+		to handle these duplicate entry types, each entry is
+		assigned by the operating system an 'instance', which is
+		derived from an entry type's ordinal position.  That is
+		to say, if there are 'N' multiple entries with the same type
+		'T' in the DMI tables (adjacent or spread apart, it
+		doesn't matter), they will be represented in sysfs as
+		entries "T-0" through "T-(N-1)":
+
+		Example entry directories::
+
+			/sys/firmware/dmi/entries/17-0
+			/sys/firmware/dmi/entries/17-1
+			/sys/firmware/dmi/entries/17-2
+			/sys/firmware/dmi/entries/17-3
+			...
+
+		Instance numbers are used in lieu of the firmware
+		assigned entry handles as the kernel itself makes no
+		guarantees that handles as exported are unique, and
+		there are likely firmware images that get this wrong in
+		the wild.
+
+		Each DMI entry in sysfs has the common header values
+		exported as attributes:
+
+		========  =================================================
+		handle	  The 16bit 'handle' that is assigned to this
+			  entry by the firmware.  This handle may be
+			  referred to by other entries.
+		length	  The length of the entry, as presented in the
+			  entry itself.  Note that this is _not the
+			  total count of bytes associated with the
+			  entry.  This value represents the length of
+			  the "formatted" portion of the entry.  This
+			  "formatted" region is sometimes followed by
+			  the "unformatted" region composed of nul
+			  terminated strings, with termination signalled
+			  by a two nul characters in series.
+		raw	  The raw bytes of the entry. This includes the
+			  "formatted" portion of the entry, the
+			  "unformatted" strings portion of the entry,
+			  and the two terminating nul characters.
+		type	  The type of the entry.  This value is the same
+			  as found in the directory name.  It indicates
+			  how the rest of the entry should be interpreted.
+		instance  The instance ordinal of the entry for the
+			  given type.  This value is the same as found
+			  in the parent directory name.
+		position  The ordinal position (zero-based) of the entry
+			  within the entirety of the DMI entry table.
+		========  =================================================
+
+		**Entry Specialization**
+
+		Some entry types may have other information available in
+		sysfs.  Not all types are specialized.
+
+		**Type 15 - System Event Log**
+
+		This entry allows the firmware to export a log of
+		events the system has taken.  This information is
+		typically backed by nvram, but the implementation
+		details are abstracted by this table.  This entry's data
+		is exported in the directory::
+
+		  /sys/firmware/dmi/entries/15-0/system_event_log
+
+		and has the following attributes (documented in the
+		SMBIOS / DMI specification under "System Event Log (Type 15)":
+
+		- area_length
+		- header_start_offset
+		- data_start_offset
+		- access_method
+		- status
+		- change_token
+		- access_method_address
+		- header_format
+		- per_log_type_descriptor_length
+		- type_descriptors_supported_count
+
+		As well, the kernel exports the binary attribute:
+
+		=============	  ====================================
+		raw_event_log	  The raw binary bits of the event log
+				  as described by the DMI entry.
+		=============	  ====================================