agp/intel: Flush chipset writes after updating a single PTE
authorChris Wilson <chris@chris-wilson.co.uk>
Thu, 18 Aug 2016 16:16:41 +0000 (17:16 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Thu, 18 Aug 2016 21:36:23 +0000 (22:36 +0100)
commit3497971a71d8b15a41b7bf2bf66ebf5909b2bd3f
treedc76c33e66248e3ad1ad990e75396a61cfcc6e89
parent600f436801deae65e48404847b61c89b4944e355
agp/intel: Flush chipset writes after updating a single PTE

After we update one PTE for a page, the caller expects to be able to
immediately use that through a GGTT read/write. To comply with the
callers expectations we therefore need to flush the chipset buffers
before returning.

Reported-by: Matti Hämäläinen <ccr@tnsp.org>
Fixes: d6473f566417 ("drm/i915: Add support for mapping an object page...")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Tested-by: Matti Hämäläinen <ccr@tnsp.org>
Cc: drm-intel-fixes@lists.freedesktop.org
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-2-chris@chris-wilson.co.uk
drivers/char/agp/intel-gtt.c