b1e52b6571
On DG2 when running the xe_vm IGT, the kernel generates loads of CAT errors and GT resets (sometimes at least). On small-bar systems seems to trigger a lot more easily (maybe due to difference in allocation strategy). Appears to be related to scratch, since we seem to use the 64K TLB hint on scratch entries, even though the scratch page is a 4K vram page. Bumping the scratch page size and physical alignment seems to fix it. Or at least we no longer hit: [ 148.872683] xe 0000:03:00.0: [drm] Engine memory cat error: guc_id=0 [ 148.872701] xe 0000:03:00.0: [drm] Engine memory cat error: guc_id=0 [ 148.875108] WARNING: CPU: 0 PID: 953 at drivers/gpu/drm/xe/xe_guc_submit.c:797 However to keep things simple, so we don't have to deal with 64K TLB hints, just move the scratch page into system memory on platforms that require 64K VRAM pages. Signed-off-by: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@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.