[Intel-gfx] [for-CI 3/5] drm/i915: Reload PD tables after semaphore wait on gen8

[Chris Wilson]

When the engine idles waiting upon a semaphore, it loses its
pagetables and we must reload them before executing the batch.

v2: Restrict w/a to non-RCS rings (RCS works correctly apparently).

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 32e0c9a8af57..2da8f4e68a7c 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1446,6 +1446,7 @@ gen8_ring_sync(struct drm_i915_gem_request *waiter_req,
 {
 	struct intel_engine_cs *waiter = waiter_req->engine;
 	struct drm_i915_private *dev_priv = waiter->dev->dev_private;
+	struct i915_hw_ppgtt *ppgtt;
 	int ret;
 
 	ret = intel_ring_begin(waiter_req, 4);
@@ -1461,6 +1462,15 @@ gen8_ring_sync(struct drm_i915_gem_request *waiter_req,
 	intel_ring_emit(waiter,
 			upper_32_bits(GEN8_WAIT_OFFSET(waiter, signaller->id)));
 	intel_ring_advance(waiter);
+
+	/* When the !RCS engines idle waiting upon a semaphore, they lose their
+	 * pagetables and we must reload them before executing the batch.
+	 * We do this on the i915_switch_context() following the wait and
+	 * before the dispatch.
+	 */
+	ppgtt = waiter_req->ctx->ppgtt;
+	if (ppgtt && waiter_req->engine->id != RCS)
+		ppgtt->pd_dirty_rings |= intel_engine_flag(waiter_req->engine);
 	return 0;
 }
 
-- 
2.8.0.rc3