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c460bc2311
Introduce a validation wrapper xe_validation_guard() as a helper intended to be used around drm_exec transactions what perform validations. Once TTM can handle exhaustive eviction we could remove this wrapper or make it mostly a NO-OP unless other functionality is added to it. Currently the wrapper takes a read lock upon entry and if the transaction hits an OOM, all locks are released and the transaction is retried with a write-lock. If all other validations participate in this scheme, the transaction with the write lock will be the only transaction validating and should have access to all available non-pinned memory. There is currently a problem in that TTM converts -EDEADLOCKS to -ENOMEM, and with ww_mutex slowpath error injections, we can hit -ENOMEMs without having actually ran out of memory. We abuse ww_mutex internals to detect such situations until TTM is fixes to not convert the error code. In the meantime, injecting ww_mutex slowpath -EDEADLOCKs is a good way to test the implementation in the absence of real OOMs. Just introduce the wrapper in this commit. It will be hooked up to the driver in following commits. v2: - Mark class_xe_validation conditional so that the loop is skipped on initialization error. - Argument sanitation (Matt Brost) - Fix conditional execution of xe_validation_ctx_fini() (Matt Brost) - Add a no_block mode for upcoming use in the CPU fault handler. v4: - Update kerneldoc. (Xe CI). Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Link: https://lore.kernel.org/r/20250908101246.65025-3-thomas.hellstrom@linux.intel.com |
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| README | ||
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.