[PATCH v2 09/13] drm/i915/xehp: Enable ccs/dual-ctx in RCU_MODE

[Matt Roper <matthew.d.roper@intel.com>]

We have to specify in the Render Control Unit Mode register
when CCS is enabled.

v2:
 - Move RCU_MODE programming to a helper function.  (Tvrtko)
 - Clean up and clarify comments.  (Tvrtko)
 - Add RCU_MODE to the GuC save/restore list.  (Daniele)

Bspec: 46034
Original-author: Michel Thierry
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine.h          |  2 ++
 drivers/gpu/drm/i915/gt/intel_engine_cs.c       | 17 +++++++++++++++++
 .../drm/i915/gt/intel_execlists_submission.c    | 16 ++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c   | 16 ++++++++++++++++
 4 files changed, 51 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index be4b1e65442f..1c0ab05c3c40 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -265,6 +265,8 @@ intel_engine_create_pinned_context(struct intel_engine_cs *engine,
 
 void intel_engine_destroy_pinned_context(struct intel_context *ce);
 
+void xehp_enable_ccs_engines(struct intel_engine_cs *engine);
+
 #define ENGINE_PHYSICAL	0
 #define ENGINE_MOCK	1
 #define ENGINE_VIRTUAL	2
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 2136c56d3abc..92f4cf9833ee 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -2070,6 +2070,23 @@ intel_engine_execlist_find_hung_request(struct intel_engine_cs *engine)
 	return active;
 }
 
+void xehp_enable_ccs_engines(struct intel_engine_cs *engine)
+{
+	/*
+	 * If there are any non-fused-off CCS engines, we need to enable CCS
+	 * support in the RCU_MODE register.  This only needs to be done once,
+	 * so for simplicity we'll take care of this in the RCS engine's
+	 * resume handler; since the RCS and all CCS engines belong to the
+	 * same reset domain and are reset together, this will also take care
+	 * of re-applying the setting after i915-triggered resets.
+	 */
+	if (!CCS_MASK(engine->gt))
+		return;
+
+	intel_uncore_write(engine->uncore, GEN12_RCU_MODE,
+			   _MASKED_BIT_ENABLE(GEN12_RCU_MODE_CCS_ENABLE));
+}
+
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "mock_engine.c"
 #include "selftest_engine.c"
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index c8407cc96c42..574c0542c92f 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -2914,6 +2914,19 @@ static int execlists_resume(struct intel_engine_cs *engine)
 	return 0;
 }
 
+static int gen12_rcs_resume(struct intel_engine_cs *engine)
+{
+	int ret;
+
+	ret = execlists_resume(engine);
+	if (ret)
+		return ret;
+
+	xehp_enable_ccs_engines(engine);
+
+	return 0;
+}
+
 static void execlists_reset_prepare(struct intel_engine_cs *engine)
 {
 	ENGINE_TRACE(engine, "depth<-%d\n",
@@ -3468,6 +3481,9 @@ static void rcs_submission_override(struct intel_engine_cs *engine)
 		engine->emit_fini_breadcrumb = gen8_emit_fini_breadcrumb_rcs;
 		break;
 	}
+
+	if (engine->class == RENDER_CLASS)
+		engine->resume = gen12_rcs_resume;
 }
 
 int intel_execlists_submission_setup(struct intel_engine_cs *engine)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 6db8bb1982ca..7e42fecd6093 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -3619,6 +3619,19 @@ static bool guc_sched_engine_disabled(struct i915_sched_engine *sched_engine)
 	return !sched_engine->tasklet.callback;
 }
 
+static int gen12_rcs_resume(struct intel_engine_cs *engine)
+{
+	int ret;
+
+	ret = guc_resume(engine);
+	if (ret)
+		return ret;
+
+	xehp_enable_ccs_engines(engine);
+
+	return 0;
+}
+
 static void guc_set_default_submission(struct intel_engine_cs *engine)
 {
 	engine->submit_request = guc_submit_request;
@@ -3739,6 +3752,9 @@ static void rcs_submission_override(struct intel_engine_cs *engine)
 		engine->emit_fini_breadcrumb = gen8_emit_fini_breadcrumb_rcs;
 		break;
 	}
+
+	if (engine->class == RENDER_CLASS)
+		engine->resume = gen12_rcs_resume;
 }
 
 static inline void guc_default_irqs(struct intel_engine_cs *engine)
-- 
2.34.1