[Intel-gfx] [PATCH v4 2/4] drm/i915: Fix compute pre-emption w/a to apply to compute engines

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

An earlier patch added support for compute engines. However, it missed
enabling the anti-pre-emption w/a for the new engine class. So move
the 'compute capable' flag earlier and use it for the pre-emption w/a
test.

Fixes: c674c5b9342e ("drm/i915/xehp: CCS should use RCS setup functions")
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Aravind Iddamsetty <aravind.iddamsetty at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Jason Ekstrand <jason at jlekstrand.net>
Cc: "Michał Winiarski" <michal.winiarski at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>
Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
Cc: "Thomas Hellström" <thomas.hellstrom at linux.intel.com>
Cc: Stuart Summers <stuart.summers at intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Ramalingam C <ramalingam.c at intel.com>
Cc: Akeem G Abodunrin <akeem.g.abodunrin at intel.com>
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_cs.c | 24 +++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 8f16955f0821e..fcbccd8d244e9 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -486,6 +486,17 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id,
 	engine->logical_mask = BIT(logical_instance);
 	__sprint_engine_name(engine);
 
+	if ((engine->class == COMPUTE_CLASS && !RCS_MASK(engine->gt) &&
+	     __ffs(CCS_MASK(engine->gt)) == engine->instance) ||
+	     engine->class == RENDER_CLASS)
+		engine->flags |= I915_ENGINE_FIRST_RENDER_COMPUTE;
+
+	/* features common between engines sharing EUs */
+	if (engine->class == RENDER_CLASS || engine->class == COMPUTE_CLASS) {
+		engine->flags |= I915_ENGINE_HAS_RCS_REG_STATE;
+		engine->flags |= I915_ENGINE_HAS_EU_PRIORITY;
+	}
+
 	engine->props.heartbeat_interval_ms =
 		CONFIG_DRM_I915_HEARTBEAT_INTERVAL;
 	engine->props.max_busywait_duration_ns =
@@ -498,20 +509,9 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id,
 		CONFIG_DRM_I915_TIMESLICE_DURATION;
 
 	/* Override to uninterruptible for OpenCL workloads. */
-	if (GRAPHICS_VER(i915) == 12 && engine->class == RENDER_CLASS)
+	if (GRAPHICS_VER(i915) == 12 && (engine->flags & I915_ENGINE_HAS_RCS_REG_STATE))
 		engine->props.preempt_timeout_ms = 0;
 
-	if ((engine->class == COMPUTE_CLASS && !RCS_MASK(engine->gt) &&
-	     __ffs(CCS_MASK(engine->gt)) == engine->instance) ||
-	     engine->class == RENDER_CLASS)
-		engine->flags |= I915_ENGINE_FIRST_RENDER_COMPUTE;
-
-	/* features common between engines sharing EUs */
-	if (engine->class == RENDER_CLASS || engine->class == COMPUTE_CLASS) {
-		engine->flags |= I915_ENGINE_HAS_RCS_REG_STATE;
-		engine->flags |= I915_ENGINE_HAS_EU_PRIORITY;
-	}
-
 	/* Cap properties according to any system limits */
 #define CLAMP_PROP(field) \
 	do { \
-- 
2.37.3