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On device unbind, migrate exported bos, including pagemap bos to system. This allows importers to take proper action without disruption. In particular, SVM clients on remote devices may continue as if nothing happened, and can chose a different placement. The evict_flags() placement is chosen in such a way that bos that aren't exported are purged. For pinned bos, we unmap DMA, but their pages are not freed yet since we can't be 100% sure they are not accessed. All pinned external bos (not just the VRAM ones) are put on the pinned.external list with this patch. But this only affects the xe_bo_pci_dev_remove_pinned() function since !VRAM bos are ignored by the suspend / resume functionality. As a follow-up we could look at removing the suspend / resume iteration over pinned external bos since we currently don't allow pinning external bos in VRAM, and other external bos don't need any special treatment at suspend / resume. v2: - Address review comments. (Matthew Auld). v3: - Don't introduce an external_evicted list (Matthew Auld) - Add a discussion around suspend / resume behaviour to the commit message. - Formatting fixes. v4: - Move dma-unmaps of pinned kernel bos to a dev managed callback to give subsystems using these bos a chance to clean them up. (Matthew Auld) Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://lore.kernel.org/r/20250326080551.40201-4-thomas.hellstrom@linux.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.