The evidence suggests that we need to start treating writes via GGTT as incoherent for gen10+, that is that they are internally buffered and not immediately visible via a read along a different physical path.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107398 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107400 Signed-off-by: Chris Wilson <[email protected]> Cc: Mika Kuoppala <[email protected]> --- drivers/gpu/drm/i915/i915_pci.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c index e443fe44da3a..adf80563d0a1 100644 --- a/drivers/gpu/drm/i915/i915_pci.c +++ b/drivers/gpu/drm/i915/i915_pci.c @@ -590,6 +590,7 @@ static const struct intel_device_info intel_coffeelake_gt3_info = { GEN9_FEATURES, \ GEN(10), \ .ddb_size = 1024, \ + .has_coherent_ggtt = false, \ GLK_COLORS static const struct intel_device_info intel_cannonlake_info = { -- 2.18.0 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
