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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>
21 lines
574 B
Text
21 lines
574 B
Text
What: /sys/devices/platform/<platform>/tokens/*
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Date: November 2017
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KernelVersion: 4.15
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Contact: "Mario Limonciello" <mario.limonciello@dell.com>
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Description:
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A read-only description of Dell platform tokens
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available on the machine.
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Each token attribute is available as a pair of
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sysfs attributes readable by a process with
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CAP_SYS_ADMIN.
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For example the token ID "5" would be available
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as the following attributes:
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0005_location
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0005_value
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Tokens will vary from machine to machine, and
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only tokens available on that machine will be
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displayed.
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