[Intel-gfx] [PATCH 1/2] drm/i915/icl: Default to Thread Group preemption for compute workloads

[Michał Winiarski]

We assumed that the default preemption granularity is fine for ICL.
Unfortunately, it turns out that some drivers don't support mid-thread
preemption for compute workloads.
If a workload that doesn't support mid-thread preemption gets mid-thread
preempted, we're going to observe a GPU hang.
While I'm here, let's also update the "workaround" naming.

Signed-off-by: Michał Winiarski <michal.winiarski at intel.com>
Cc: Anuj Phogat <anuj.phogat at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Cc: Rafael Antognolli <rafael.antognolli at intel.com>
Tested-by: Anuj Phogat <anuj.phogat at intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/intel_workarounds.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index 89b4007d5200..2fba33509f4e 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -555,6 +555,11 @@ static void icl_ctx_workarounds_init(struct intel_engine_cs *engine)
 			   GEN10_CACHE_MODE_SS,
 			   0, /* write-only, so skip validation */
 			   _MASKED_BIT_ENABLE(FLOAT_BLEND_OPTIMIZATION_ENABLE));
+
+	/* WaDisableGPGPUMidThreadPreemption:icl */
+	WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1,
+			    GEN9_PREEMPT_GPGPU_LEVEL_MASK,
+			    GEN9_PREEMPT_GPGPU_THREAD_GROUP_LEVEL);
 }
 
 void intel_engine_init_ctx_wa(struct intel_engine_cs *engine)
@@ -1162,8 +1167,8 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 				    GEN7_DISABLE_SAMPLER_PREFETCH);
 	}
 
-	if (IS_GEN(i915, 9) || IS_CANNONLAKE(i915)) {
-		/* WaEnablePreemptionGranularityControlByUMD:skl,bxt,kbl,cfl,cnl */
+	if (IS_GEN_RANGE(i915, 9, 11)) {
+		/* FtrPerCtxtPreemptionGranularityControl:skl,bxt,kbl,cfl,cnl,icl */
 		wa_masked_en(wal,
 			     GEN7_FF_SLICE_CS_CHICKEN1,
 			     GEN9_FFSC_PERCTX_PREEMPT_CTRL);
-- 
2.20.1