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Following the removal of the last workarounds, the only CSB mmio access is for the old vGPU interface. The mmio registers presented by vGPU do not require forcewake and can be treated as ordinary volatile memory, i.e. they behave just like the HWSP access just at a different location. We can reduce the CSB access to a set of read/write/buffer pointers and treat the various paths identically and not worry about forcewake. (Forcewake is nightmare for worstcase latency, and we want to process this all with irqsoff -- no latency allowed!) v2: Comments, comments, comments. Well, 2 bonus comments. 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/20180628201211.13837-5-chris@chris-wilson.co.uk |
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| README | ||
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.