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 <[email protected]> Fixes: d6473f566417 ("drm/i915: Add support for mapping an object page...") Signed-off-by: Chris Wilson <[email protected]> Cc: Ankitprasad Sharma <[email protected]> Cc: Tvrtko Ursulin <[email protected]> Tested-by: Matti Hämäläinen <[email protected]> Cc: [email protected] --- 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); -- 2.9.3 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
