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We were relying on the uncached reads when processing the CSB to provide ourselves with the serialisation with the interrupt handler (so we could detect new interrupts in the middle of processing the old one). However, in commit767a983ab2("drm/i915/execlists: Read the context-status HEAD from the HWSP") those uncached reads were eliminated (on one path at least) and along with them our serialisation. The result is that we would very rarely miss notification of a new interrupt and leave a context-switch unprocessed, hanging the GPU. Fixes:767a983ab2("drm/i915/execlists: Read the context-status HEAD from the HWSP") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Michel Thierry <michel.thierry@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Michel Thierry <michel.thierry@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180321091027.21034-1-chris@chris-wilson.co.uk (cherry picked from commit9153e6b7c8) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.