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@xxxxxxxx>
Fixes: d6473f566417 ("drm/i915: Add support for mapping an object page...")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Tested-by: Matti Hämäläinen <ccr@xxxxxxxx>
Cc: drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx
---
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
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