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Use the per-engine sysfs directory to let userspace discover the mmio_base of each engine. Prior to recent generations, the user accessible registers on each engine are at a fixed offset relative to each engine -- but require absolute addressing. As the absolute address depends on the actual physical engine, this is not always possible to determine from userspace (for example icl may expose vcs1 or vcs2 as the second vcs engine). Make this easy for userspace to discover by providing the mmio_base in sysfs. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Steve Carbonari <steven.carbonari@intel.com> Tested-by: Steve Carbonari <steven.carbonari@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200228131716.3243616-2-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.