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On gen8+ we're currently using the PPHWSP of the kernel ctx as the global HWSP. However, when the kernel ctx gets submitted (e.g. from __intel_autoenable_gt_powersave) the HW will use that page as both HWSP and PPHWSP. This causes a conflict in the register arena of the HWSP, i.e. dword indices below 0x30. We don't current utilize this arena, but in the following patches we will take advantage of the cached register state for handling execlist's context status interrupt. To avoid the conflict, instead of re-using the PPHWSP of the kernel ctx we can allocate a separate page for the HWSP like what happens for pre-execlists platform. v2: Add a use-case for the register arena of the HWSP. Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Michel Thierry <michel.thierry@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1499357440-34688-1-git-send-email-daniele.ceraolospurio@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Michel Thierry <michel.thierry@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170913085605.18299-3-chris@chris-wilson.co.uk
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.