b267a67000
A few fixes/updates are required around the GSC memory allocation and it is easier to do them all at the same time. The changes are as follows: 1 - Switch the memory allocation to stolen memory. We need to avoid accesses from GSC FW to normal memory after the suspend function has completed and to do so we can either switch to using stolen or make sure the GSC is gone to sleep before the end of the suspend function. Given that the GSC waits for a bit before going idle even if there are no pending operations, it is easier and quicker to just use stolen memory. 2 - Reduce the GSC allocation size to 4MBs, which is the POR requirement. The 8MBs were needed only for early FW and I had misunderstood that as being the expected POR size when I sent the original patch. 3 - Perma-map the GSC allocation. This isn't required immediately, but it will be needed later to be able to quickly extract the GSC logs, which are inside the allocation. Since the mapping code needs to be rewritten due to switching to stolen, it makes sense to do the switch immediately to avoid having to change it again later. Note that the explicit setting of CACHE_NONE for Wa_22016122933 has been dropped because that's the default setting for stolen memory on !LLC platforms. v2: only memset the memory we're not overwriting (Alan) Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Alan Previn <alan.previn.teres.alexis@intel.com> Cc: John Harrison <John.C.Harrison@Intel.com> Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com> Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230612181529.2222451-2-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.