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c2ae94cf8c
The CPU fault handler may populate bos and migrate, and in doing so might interfere with other tasks validating. Rework the CPU fault handler completely into a fastpath and a slowpath. The fastpath trylocks only the validation lock in read-mode. If that fails, there's a fallback to the slowpath, where we do a full validation transaction. This mandates open-coding of bo locking, bo idling and bo populating, but we still call into TTM for fault finalizing. v2: - Rework the CPU fault handler to actually take part in the exhaustive eviction scheme (Matthew Brost). v3: - Don't return anything but VM_FAULT_RETRY if we've dropped the mmap_lock. Not even if a signal is pending. - Rebase on gpu_madvise() and split out fault migration. - Wait for idle after migration. - Check whether the resource manager uses tts to determine whether to map the tt or iomem. - Add a number of asserts. - Allow passing a ttm_operation_ctx to xe_bo_migrate() so that it's possible to try non-blocking migration. - Don't fall through to TTM on migration / population error Instead remove the gfp_retry_mayfail in mode 2 where we must succeed. (Matthew Brost) v5: - Don't allow faulting in the imported bo case (Matthew Brost) Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthews Brost <matthew.brost@intel.com> Link: https://lore.kernel.org/r/20250908101246.65025-7-thomas.hellstrom@linux.intel.com |
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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.