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platform/x86: dell-smbios: Add a sysfs interface for SMBIOS tokens

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Currently userspace tools can access system tokens via the dcdbas
kernel module and a SMI call that will cause the platform to execute
SMM code.

With a goal in mind of deprecating the dcdbas kernel module a different
method for accessing these tokens from userspace needs to be created.

This is intentionally marked to only be readable as a process with
CAP_SYS_ADMIN as it can contain sensitive information about the
platform's configuration.

While adding this interface I found that some tokens are duplicated.
These need to be ignored from sysfs to avoid duplicate files.

MAINTAINERS was missing for this driver.  Add myself and Pali to
maintainers list for it.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Reviewed-by: Edward O'Callaghan <quasisec@google.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
This commit is contained in:
Mario Limonciello
2017-11-01 14:25:30 -05:00
committed by Darren Hart (VMware)
parent 980f481d63
commit 33b9ca1e53
3 changed files with 240 additions and 1 deletions
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Documentation/ABI/testing/sysfs-platform-dell-smbios Normal file
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What: /sys/devices/platform/<platform>/tokens/*
Date: November 2017
KernelVersion: 4.15
Contact: "Mario Limonciello" <mario.limonciello@dell.com>
Description:
A read-only description of Dell platform tokens
available on the machine.
Each token attribute is available as a pair of
sysfs attributes readable by a process with
CAP_SYS_ADMIN.
For example the token ID "5" would be available
as the following attributes:
0005_location
0005_value
Tokens will vary from machine to machine, and
only tokens available on that machine will be
displayed.