[Intel-gfx] [PATCH v7 2/3] drm/i915: whitelist PS_(DEPTH|INVOCATION)_COUNT

[Lionel Landwerlin]

CFL:C0+ changed the status of those registers which are now
blacklisted by default.

This is breaking a number of CTS tests on GL & Vulkan :

  KHR-GL45.pipeline_statistics_query_tests_ARB.functional_fragment_shader_invocations (GL)

  dEQP-VK.query_pool.statistics_query.fragment_shader_invocations.* (Vulkan)

v2: Only use one whitelist entry (Lionel)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Cc: stable at vger.kernel.org
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 993804d09517..b117583e38bb 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1092,10 +1092,25 @@ static void glk_whitelist_build(struct intel_engine_cs *engine)
 
 static void cfl_whitelist_build(struct intel_engine_cs *engine)
 {
+	struct i915_wa_list *w = &engine->whitelist;
+
 	if (engine->class != RENDER_CLASS)
 		return;
 
-	gen9_whitelist_build(&engine->whitelist);
+	gen9_whitelist_build(w);
+
+	/*
+	 * WaAllowPMDepthAndInvocationCountAccessFromUMD:cfl,whl,cml,aml
+	 *
+	 * This covers 4 register which are next to one another :
+	 *   - PS_INVOCATION_COUNT
+	 *   - PS_INVOCATION_COUNT_UDW
+	 *   - PS_DEPTH_COUNT
+	 *   - PS_DEPTH_COUNT_UDW
+	 */
+	whitelist_reg_ext(w, PS_INVOCATION_COUNT,
+			  RING_FORCE_TO_NONPRIV_RD |
+			  RING_FORCE_TO_NONPRIV_RANGE_4);
 }
 
 static void cnl_whitelist_build(struct intel_engine_cs *engine)
-- 
2.21.0.392.gf8f6787159e