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86554f48e5
The RING_NONPRIV allows us to add registers to a whitelist that allows userspace to modify them. Ideally such registers should be safe and saved within the context such that they do not impact system behaviour for other users. This selftest verifies that those registers we do add are (a) then writable by userspace and (b) only affect a single client. Opens: - Is GEN9_SLICE_COMMON_ECO_CHICKEN1 really write-only? v2: Remove the blatant copy-paste. v3: Emulate userspace register writes via the batch again. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190424110941.9869-1-chris@chris-wilson.co.uk
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.