drm/i915: enumerate scratch fields

We have a bunch of offsets in the scratch buffer. As we're about to
add some more, let's group all of the offsets in a common location.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190709123351.5645-6-lionel.g.landwerlin@intel.com

drivers/gpu/drm/i915/gt/intel_gt.h

@@ -24,9 +24,10 @@ void intel_gt_chipset_flush(struct intel_gt *gt);
 int intel_gt_init_scratch(struct intel_gt *gt, unsigned int size);
 void intel_gt_fini_scratch(struct intel_gt *gt);
 
-static inline u32 intel_gt_scratch_offset(const struct intel_gt *gt)
+static inline u32 intel_gt_scratch_offset(const struct intel_gt *gt,
+					  enum intel_gt_scratch_field field)
 {
-	return i915_ggtt_offset(gt->scratch);
+	return i915_ggtt_offset(gt->scratch) + field;
 }
 
 #endif /* __INTEL_GT_H__ */

drivers/gpu/drm/i915/gt/intel_gt_types.h

@@ -60,4 +60,19 @@ struct intel_gt {
 	u32 pm_ier;
 };
 
+enum intel_gt_scratch_field {
+	/* 8 bytes */
+	INTEL_GT_SCRATCH_FIELD_DEFAULT = 0,
+
+	/* 8 bytes */
+	INTEL_GT_SCRATCH_FIELD_CLEAR_SLM_WA = 128,
+
+	/* 8 bytes */
+	INTEL_GT_SCRATCH_FIELD_RENDER_FLUSH = 128,
+
+	/* 8 bytes */
+	INTEL_GT_SCRATCH_FIELD_COHERENTL3_WA = 256,
+
+};
+
 #endif /* __INTEL_GT_TYPES_H__ */

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

@@ -1782,7 +1782,8 @@ gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine, u32 *batch)
 	/* NB no one else is allowed to scribble over scratch + 256! */
 	*batch++ = MI_STORE_REGISTER_MEM_GEN8 | MI_SRM_LRM_GLOBAL_GTT;
 	*batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4);
-	*batch++ = intel_gt_scratch_offset(engine->gt) + 256;
+	*batch++ = intel_gt_scratch_offset(engine->gt,
+					   INTEL_GT_SCRATCH_FIELD_COHERENTL3_WA);
 	*batch++ = 0;
 
 	*batch++ = MI_LOAD_REGISTER_IMM(1);
@@ -1796,12 +1797,19 @@ gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine, u32 *batch)
 
 	*batch++ = MI_LOAD_REGISTER_MEM_GEN8 | MI_SRM_LRM_GLOBAL_GTT;
 	*batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4);
-	*batch++ = intel_gt_scratch_offset(engine->gt) + 256;
+	*batch++ = intel_gt_scratch_offset(engine->gt,
+					   INTEL_GT_SCRATCH_FIELD_COHERENTL3_WA);
 	*batch++ = 0;
 
 	return batch;
 }
 
+static u32 slm_offset(struct intel_engine_cs *engine)
+{
+	return intel_gt_scratch_offset(engine->gt,
+				       INTEL_GT_SCRATCH_FIELD_CLEAR_SLM_WA);
+}
+
 /*
  * Typically we only have one indirect_ctx and per_ctx batch buffer which are
  * initialized at the beginning and shared across all contexts but this field
@@ -1833,8 +1841,7 @@ static u32 *gen8_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch)
 				       PIPE_CONTROL_GLOBAL_GTT_IVB |
 				       PIPE_CONTROL_CS_STALL |
 				       PIPE_CONTROL_QW_WRITE,
-				       intel_gt_scratch_offset(engine->gt) +
-				       2 * CACHELINE_BYTES);
+				       slm_offset(engine));
 
 	*batch++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
 
@@ -2528,7 +2535,8 @@ static int gen8_emit_flush_render(struct i915_request *request,
 {
 	struct intel_engine_cs *engine = request->engine;
 	u32 scratch_addr =
-		intel_gt_scratch_offset(engine->gt) + 2 * CACHELINE_BYTES;
+		intel_gt_scratch_offset(engine->gt,
+					INTEL_GT_SCRATCH_FIELD_RENDER_FLUSH);
 	bool vf_flush_wa = false, dc_flush_wa = false;
 	u32 *cs, flags = 0;
 	int len;

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

@@ -76,7 +76,8 @@ gen2_render_ring_flush(struct i915_request *rq, u32 mode)
 	*cs++ = cmd;
 	while (num_store_dw--) {
 		*cs++ = MI_STORE_DWORD_IMM | MI_MEM_VIRTUAL;
-		*cs++ = intel_gt_scratch_offset(rq->engine->gt);
+		*cs++ = intel_gt_scratch_offset(rq->engine->gt,
+						INTEL_GT_SCRATCH_FIELD_DEFAULT);
 		*cs++ = 0;
 	}
 	*cs++ = MI_FLUSH | MI_NO_WRITE_FLUSH;
@@ -149,7 +150,8 @@ gen4_render_ring_flush(struct i915_request *rq, u32 mode)
 	 */
 	if (mode & EMIT_INVALIDATE) {
 		*cs++ = GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE;
-		*cs++ = intel_gt_scratch_offset(rq->engine->gt) |
+		*cs++ = intel_gt_scratch_offset(rq->engine->gt,
+						INTEL_GT_SCRATCH_FIELD_DEFAULT) |
 			PIPE_CONTROL_GLOBAL_GTT;
 		*cs++ = 0;
 		*cs++ = 0;
@@ -158,7 +160,8 @@ gen4_render_ring_flush(struct i915_request *rq, u32 mode)
 			*cs++ = MI_FLUSH;
 
 		*cs++ = GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE;
-		*cs++ = intel_gt_scratch_offset(rq->engine->gt) |
+		*cs++ = intel_gt_scratch_offset(rq->engine->gt,
+						INTEL_GT_SCRATCH_FIELD_DEFAULT) |
 			PIPE_CONTROL_GLOBAL_GTT;
 		*cs++ = 0;
 		*cs++ = 0;
@@ -212,7 +215,8 @@ static int
 gen6_emit_post_sync_nonzero_flush(struct i915_request *rq)
 {
 	u32 scratch_addr =
-		intel_gt_scratch_offset(rq->engine->gt) + 2 * CACHELINE_BYTES;
+		intel_gt_scratch_offset(rq->engine->gt,
+					INTEL_GT_SCRATCH_FIELD_RENDER_FLUSH);
 	u32 *cs;
 
 	cs = intel_ring_begin(rq, 6);
@@ -246,7 +250,8 @@ static int
 gen6_render_ring_flush(struct i915_request *rq, u32 mode)
 {
 	u32 scratch_addr =
-		intel_gt_scratch_offset(rq->engine->gt) + 2 * CACHELINE_BYTES;
+		intel_gt_scratch_offset(rq->engine->gt,
+					INTEL_GT_SCRATCH_FIELD_RENDER_FLUSH);
 	u32 *cs, flags = 0;
 	int ret;
 
@@ -304,7 +309,8 @@ static u32 *gen6_rcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
 
 	*cs++ = GFX_OP_PIPE_CONTROL(4);
 	*cs++ = PIPE_CONTROL_QW_WRITE;
-	*cs++ = intel_gt_scratch_offset(rq->engine->gt) |
+	*cs++ = intel_gt_scratch_offset(rq->engine->gt,
+					INTEL_GT_SCRATCH_FIELD_DEFAULT) |
 		PIPE_CONTROL_GLOBAL_GTT;
 	*cs++ = 0;
 
@@ -349,7 +355,8 @@ static int
 gen7_render_ring_flush(struct i915_request *rq, u32 mode)
 {
 	u32 scratch_addr =
-		intel_gt_scratch_offset(rq->engine->gt) + 2 * CACHELINE_BYTES;
+		intel_gt_scratch_offset(rq->engine->gt,
+					INTEL_GT_SCRATCH_FIELD_RENDER_FLUSH);
 	u32 *cs, flags = 0;
 
 	/*
@@ -1078,7 +1085,9 @@ i830_emit_bb_start(struct i915_request *rq,
 		   u64 offset, u32 len,
 		   unsigned int dispatch_flags)
 {
-	u32 *cs, cs_offset = intel_gt_scratch_offset(rq->engine->gt);
+	u32 *cs, cs_offset =
+		intel_gt_scratch_offset(rq->engine->gt,
+					INTEL_GT_SCRATCH_FIELD_DEFAULT);
 
 	GEM_BUG_ON(rq->engine->gt->scratch->size < I830_WA_SIZE);
 
@@ -1522,7 +1531,8 @@ static int flush_pd_dir(struct i915_request *rq)
 	/* Stall until the page table load is complete */
 	*cs++ = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT;
 	*cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine->mmio_base));
-	*cs++ = intel_gt_scratch_offset(rq->engine->gt);
+	*cs++ = intel_gt_scratch_offset(rq->engine->gt,
+					INTEL_GT_SCRATCH_FIELD_DEFAULT);
 	*cs++ = MI_NOOP;
 
 	intel_ring_advance(rq, cs);
@@ -1638,7 +1648,8 @@ static inline int mi_set_context(struct i915_request *rq, u32 flags)
 			/* Insert a delay before the next switch! */
 			*cs++ = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT;
 			*cs++ = i915_mmio_reg_offset(last_reg);
-			*cs++ = intel_gt_scratch_offset(rq->engine->gt);
+			*cs++ = intel_gt_scratch_offset(rq->engine->gt,
+							INTEL_GT_SCRATCH_FIELD_DEFAULT);
 			*cs++ = MI_NOOP;
 		}
 		*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;