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In preparation for removing the manual EMIT_FLUSH prior to emitting the breadcrumb implement the flush inline with writing the breadcrumb for ringbuffer emission. With a combined flush+breadcrumb, we can use a single operation to both flush and after the flush is complete (post-sync) write the breadcrumb. This gives us a strongly ordered operation that should be sufficient to serialise the write before we emit the interrupt; and therefore we may take the opportunity to remove the irq_seqno_barrier w/a for gen6+. Although using the PIPECONTROL to write the breadcrumb is slower than MI_STORE_DWORD_IMM, by combining the operations into one and removing the extra flush (next patch) it is faster For gen2-5, we simply combine the MI_FLUSH into the breadcrumb emission, though maybe we could find a solution here to the seqno-vs-interrupt issue on Ironlake by mixing up the flush? The answer is no, adding an MI_FLUSH before the interrupt is insufficient. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181228153114.4948-2-chris@chris-wilson.co.uk
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.