From 3497971a71d8b15a41b7bf2bf66ebf5909b2bd3f Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 18 Aug 2016 17:16:41 +0100 Subject: [PATCH] agp/intel: Flush chipset writes after updating a single PTE MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Fixes: d6473f566417 ("drm/i915: Add support for mapping an object page...") Signed-off-by: Chris Wilson Cc: Ankitprasad Sharma Cc: Tvrtko Ursulin Tested-by: Matti Hämäläinen Cc: drm-intel-fixes@lists.freedesktop.org Reviewed-by: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-2-chris@chris-wilson.co.uk --- drivers/char/agp/intel-gtt.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c index 44311296ec02..0f7d28a98b9a 100644 --- a/drivers/char/agp/intel-gtt.c +++ b/drivers/char/agp/intel-gtt.c @@ -845,6 +845,8 @@ void intel_gtt_insert_page(dma_addr_t addr, unsigned int flags) { intel_private.driver->write_entry(addr, pg, flags); + if (intel_private.driver->chipset_flush) + intel_private.driver->chipset_flush(); } EXPORT_SYMBOL(intel_gtt_insert_page); -- 2.20.1