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The PTEs expect the offset from the base of the fake LMEM region (i.e. the base of stolen) and not from the base of the DSM. Quoting the specs: "Driver will set the Device Memory bit = 1 in the PTE when pointing to a page in DSM and program the PTE with offset from LMEM_BAR. Device Memory Offset from LMEM_BAR is same as offset from BGSM." DSM starts 8MBs from BGSM, so we set dsm_base = 8MB. Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Aravind Iddamsetty <aravind.iddamsetty@intel.com> Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Lucas De Marchi <lucas.demarchi@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Nirmoy Das <nirmoy.das@intel.com> Cc: Fei Yang <fei.yang@intel.com> Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Nirmoy Das <nirmoy.das@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230328012430.2524330-1-daniele.ceraolospurio@intel.com
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.