drm/i915/xehp: Drop aux table invalidation on FlatCCS platforms

Platforms with FlatCCS do not use auxiliary planes for compression
control data and thus do not need traditional aux table invalidation
(and the registers no longer even exist).

Original-author: CQ Tang
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220301052952.1706597-1-matthew.d.roper@intel.com

drivers/gpu/drm/i915/gt/gen8_engine_cs.c

@@ -236,7 +236,7 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
 
 	if (mode & EMIT_INVALIDATE) {
 		u32 flags = 0;
-		u32 *cs;
+		u32 *cs, count;
 
 		flags |= PIPE_CONTROL_COMMAND_CACHE_INVALIDATE;
 		flags |= PIPE_CONTROL_TLB_INVALIDATE;
@@ -254,7 +254,12 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
 		if (engine->class == COMPUTE_CLASS)
 			flags &= ~PIPE_CONTROL_3D_FLAGS;
 
-		cs = intel_ring_begin(rq, 8 + 4);
+		if (!HAS_FLAT_CCS(rq->engine->i915))
+			count = 8 + 4;
+		else
+			count = 8;
+
+		cs = intel_ring_begin(rq, count);
 		if (IS_ERR(cs))
 			return PTR_ERR(cs);
 
@@ -267,8 +272,10 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
 
 		cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
 
-		/* hsdes: 1809175790 */
-		cs = gen12_emit_aux_table_inv(GEN12_GFX_CCS_AUX_NV, cs);
+		if (!HAS_FLAT_CCS(rq->engine->i915)) {
+			/* hsdes: 1809175790 */
+			cs = gen12_emit_aux_table_inv(GEN12_GFX_CCS_AUX_NV, cs);
+		}
 
 		*cs++ = preparser_disable(false);
 		intel_ring_advance(rq, cs);
@@ -283,12 +290,15 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
 	u32 cmd, *cs;
 
 	cmd = 4;
-	if (mode & EMIT_INVALIDATE)
+	if (mode & EMIT_INVALIDATE) {
 		cmd += 2;
-	if (mode & EMIT_INVALIDATE)
-		aux_inv = rq->engine->mask & ~BIT(BCS0);
-	if (aux_inv)
-		cmd += 2 * hweight32(aux_inv) + 2;
+
+		if (!HAS_FLAT_CCS(rq->engine->i915)) {
+			aux_inv = rq->engine->mask & ~BIT(BCS0);
+			if (aux_inv)
+				cmd += 2 * hweight32(aux_inv) + 2;
+		}
+	}
 
 	cs = intel_ring_begin(rq, cmd);
 	if (IS_ERR(cs))