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Daniele Ceraolo Spurio
dcdd6b84d9
PXP requires submissions to the HW for the following operations 1) Key invalidation, done via the VCS engine 2) Communication with the GSC FW for session management, done via the GSCCS. Key invalidation submissions are serialized (only 1 termination can be serviced at a given time) and done via GGTT, so we can allocate a simple BO and a kernel queue for it. Submissions for session management are tied to a PXP client (identified by a unique host_session_id); from the GSC POV this is a user-accessible construct, so all related submission must be done via PPGTT. The driver does not currently support PPGTT submission from within the kernel, so to add this support, the following changes have been included: - a new type of kernel-owned VM (marked as GSC), required to ensure we don't use fault mode on the engine and to mark the different lock usage with lockdep. - a new function to map a BO into a VM from within the kernel. v2: improve comments and function name, remove unneeded include (John) v3: fix variable/function names in documentation Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Matthew Brost <matthew.brost@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: John Harrison <John.C.Harrison@Intel.com> Reviewed-by: John Harrison <John.C.Harrison@Intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20250129174140.948829-3-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 reStructuredText 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.