f07d9a615b
The SLPC code has a strict 5ms timeout from when the start command is queued to when we expect the reply to appear in memory. This works if the CT channel is empty, but if the channel is busy there might be an extra delay that causes the process to exceeded the timeout. We see this issue when a reset occurs while userspace keeps submitting, because the submission code is re-enabled first and it will start using the channel to service those submissions. To fix this, we can simply start SLPC before re-enabling submission. This has also the benefit of not allowing submissions to go through with an uninitialized SLPC. Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/375 Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com> Cc: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Link: https://lore.kernel.org/r/20230628001642.3170070-1-daniele.ceraolospurio@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.