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We currently assume that we can upfront know exactly how many fence slots we will need at the start of the exec, however the TTM bo_validate can itself consume numerous fence slots, and due to how the dma_resv_reserve_fences() works it only ensures that at least that many fence slots are available. With this it is quite possible that TTM steals some of the fence slots and then when it comes time to do the vma binding and final exec stage we are lacking enough fence slots, leading to some nasty BUG_ON(). A simple fix is to reserve our own fences later, after the validate stage. References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/698 Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: Matthew Brost <matthew.brost@intel.com> Tested-by: José Roberto de Souza <jose.souza@intel.com> Reviewed-by: José Roberto de Souza <jose.souza@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 Restructured Text 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.