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Using engine->irq_posted for execlists, we are not always serialised by the tasklet as we supposed. On the reset paths, the tasklet is disabled and ignored. Instead, we manipulate the engine->irq_posted directly to account for the reset, but if an interrupt fired before the reset and so wrote to engine->irq_posted, that write may not be flushed from the local CPU's cacheline until much later as the tasklet is already active and so does not generate a mb(). To correctly serialise the interrupt with reset, we need serialisation on the set_bit() itself. And at last Mika can be happy. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Michał Winiarski <michal.winiarski@intel.com> CC: Michel Thierry <michel.thierry@intel.com> Cc: Jeff McGee <jeff.mcgee@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Jeff McGee <jeff.mcgee@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180322073533.5313-3-chris@chris-wilson.co.uk
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.