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e6d6f68943
As opposed to other GEN12 platforms ADLP provides a way to program the stride of CCS surfaces independently of the main surface stride (within the corresponding limit of the preceding and succeeding power-of-two values of the main surface stride). Using this HW feature we can remove the POT stride restriction on CCS surfaces, making the ADLP CCS FB uAPI (FB modifiers) identical to that of TGL. The HW makes the CCS stride flexible programming possible by deriving the stride from the value programmed to the PLANE_STRIDE register. After that the HW rounds up this value to the next power-of-two value and uses this for walking the pages of the main surface mapped to GTT/DPT. To align with the above scheme, introduce a scanout_stride view parameter which will be programmed to the PLANE_STRIDE register and use the mapping_stride view param to store the POT aligned value of the same. By requiring userspace to pass in FBs with a CCS stride that aligns with the main surface stride (matching the requirement of all GEN12 platforms), the scanout_stride will be the userspace main surface stride and the mapping_stride will be the POT rounded value of the same. Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com> Cc: Nanley G Chery <nanley.g.chery@intel.com> Cc: Sameer Lattannavar <sameer.lattannavar@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211026225105.2783797-8-imre.deak@intel.com |
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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.