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Matthew Auld
86f69c2611
Currently we move pinned objects, relying on the fact that the lpfn/fpfn will force the placement to occupy the same pages when restoring. However this then limits all such pinned objects to be contig underneath. In addition it is likely a little fragile moving pinned objects in the first place. Rather than moving such objects rather copy the page contents to a secondary system memory object, that way the VRAM pages never move and remain pinned. This also opens the door for eventually having non-contig pinned objects that can also be saved/restored using blitter. v2: - Make sure to drop the fence ref. - Handle NULL bo->migrate. v3: - Ensure we add the copy fence to the BOs, otherwise backup_obj can be freed before pipelined copy finishes. v4: - Rebase on newly added apply-to-pinned infra. Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1182 Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Satyanarayana K V P <satyanarayana.k.v.p@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com> Link: https://lore.kernel.org/r/20250403102440.266113-10-matthew.auld@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.