drm/i915/execlists: Move RCS mmio workaround to new common wa_list

We can move the remaining RCS workarounds applied to only gen8 to the
engine->wa_list, and then reduce all engine->init_hw callbacks to common
code. The benefit of using the new wa_list is that we verify that the
registers are indeed restored and keep their magic values.

v2: INSTPM_FORCE_ORDERING is already part of gen8_ctx_workarounds, and
as confirmed by the mmio verification is a part of the context image!
v3: MI_MODE is already part of gen8_ctx_workarounds...
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181206180713.6827-2-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/intel_lrc.c

@@ -1628,6 +1628,7 @@ static bool unexpected_starting_state(struct intel_engine_cs *engine)
 static int gen8_init_common_ring(struct intel_engine_cs *engine)
 {
 	intel_engine_apply_workarounds(engine);
+	intel_engine_apply_whitelist(engine);
 
 	intel_mocs_init_engine(engine);
 
@@ -1644,43 +1645,6 @@ static int gen8_init_common_ring(struct intel_engine_cs *engine)
 	return 0;
 }
 
-static int gen8_init_render_ring(struct intel_engine_cs *engine)
-{
-	struct drm_i915_private *dev_priv = engine->i915;
-	int ret;
-
-	ret = gen8_init_common_ring(engine);
-	if (ret)
-		return ret;
-
-	intel_engine_apply_whitelist(engine);
-
-	/* We need to disable the AsyncFlip performance optimisations in order
-	 * to use MI_WAIT_FOR_EVENT within the CS. It should already be
-	 * programmed to '1' on all products.
-	 *
-	 * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
-	 */
-	I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
-
-	I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
-
-	return 0;
-}
-
-static int gen9_init_render_ring(struct intel_engine_cs *engine)
-{
-	int ret;
-
-	ret = gen8_init_common_ring(engine);
-	if (ret)
-		return ret;
-
-	intel_engine_apply_whitelist(engine);
-
-	return 0;
-}
-
 static struct i915_request *
 execlists_reset_prepare(struct intel_engine_cs *engine)
 {
@@ -2280,10 +2244,6 @@ int logical_render_ring_init(struct intel_engine_cs *engine)
 		engine->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
 
 	/* Override some for render ring. */
-	if (INTEL_GEN(dev_priv) >= 9)
-		engine->init_hw = gen9_init_render_ring;
-	else
-		engine->init_hw = gen8_init_render_ring;
 	engine->init_context = gen8_init_rcs_context;
 	engine->emit_flush = gen8_emit_flush_render;
 	engine->emit_breadcrumb = gen8_emit_breadcrumb_rcs;