drm/i915: Rename local struct intel_engine_cs variables

Done by the Coccinelle script below plus a manual
intervention to GEN8_RING_SEMAPHORE_INIT.

@@
expression E;
@@
- struct intel_engine_cs *ring = E;
+ struct intel_engine_cs *engine = E;
<+...
- ring
+ engine
...+>
@@
@@
- struct intel_engine_cs *ring;
+ struct intel_engine_cs *engine;
<+...
- ring
+ engine
...+>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_gem_debug.c

@@ -36,29 +36,30 @@ i915_verify_lists(struct drm_device *dev)
 	static int warned;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_i915_gem_object *obj;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int err = 0;
 	int i;
 
 	if (warned)
 		return 0;
 
-	for_each_ring(ring, dev_priv, i) {
-		list_for_each_entry(obj, &ring->active_list, ring_list[ring->id]) {
+	for_each_ring(engine, dev_priv, i) {
+		list_for_each_entry(obj, &engine->active_list,
+				    ring_list[engine->id]) {
 			if (obj->base.dev != dev ||
 			    !atomic_read(&obj->base.refcount.refcount)) {
 				DRM_ERROR("%s: freed active obj %p\n",
-					  ring->name, obj);
+					  engine->name, obj);
 				err++;
 				break;
 			} else if (!obj->active ||
-				   obj->last_read_req[ring->id] == NULL) {
+				   obj->last_read_req[engine->id] == NULL) {
 				DRM_ERROR("%s: invalid active obj %p\n",
-					  ring->name, obj);
+					  engine->name, obj);
 				err++;
 			} else if (obj->base.write_domain) {
 				DRM_ERROR("%s: invalid write obj %p (w %x)\n",
-					  ring->name,
+					  engine->name,
 					  obj, obj->base.write_domain);
 				err++;
 			}

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -1095,7 +1095,7 @@ void
 i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 				   struct drm_i915_gem_request *req)
 {
-	struct intel_engine_cs *ring = i915_gem_request_get_ring(req);
+	struct intel_engine_cs *engine = i915_gem_request_get_ring(req);
 	struct i915_vma *vma;
 
 	list_for_each_entry(vma, vmas, exec_list) {
@@ -1122,7 +1122,7 @@ i915_gem_execbuffer_move_to_active(struct list_head *vmas,
 		if (entry->flags & EXEC_OBJECT_NEEDS_FENCE) {
 			i915_gem_request_assign(&obj->last_fenced_req, req);
 			if (entry->flags & __EXEC_OBJECT_HAS_FENCE) {
-				struct drm_i915_private *dev_priv = to_i915(ring->dev);
+				struct drm_i915_private *dev_priv = to_i915(engine->dev);
 				list_move_tail(&dev_priv->fence_regs[obj->fence_reg].lru_list,
 					       &dev_priv->mm.fence_list);
 			}
@@ -1146,11 +1146,11 @@ static int
 i915_reset_gen7_sol_offsets(struct drm_device *dev,
 			    struct drm_i915_gem_request *req)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret, i;
 
-	if (!IS_GEN7(dev) || ring != &dev_priv->ring[RCS]) {
+	if (!IS_GEN7(dev) || engine != &dev_priv->ring[RCS]) {
 		DRM_DEBUG("sol reset is gen7/rcs only\n");
 		return -EINVAL;
 	}
@@ -1160,12 +1160,12 @@ i915_reset_gen7_sol_offsets(struct drm_device *dev,
 		return ret;
 
 	for (i = 0; i < 4; i++) {
-		intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-		intel_ring_emit_reg(ring, GEN7_SO_WRITE_OFFSET(i));
-		intel_ring_emit(ring, 0);
+		intel_ring_emit(engine, MI_LOAD_REGISTER_IMM(1));
+		intel_ring_emit_reg(engine, GEN7_SO_WRITE_OFFSET(i));
+		intel_ring_emit(engine, 0);
 	}
 
-	intel_ring_advance(ring);
+	intel_ring_advance(engine);
 
 	return 0;
 }
@@ -1229,7 +1229,7 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
 			       struct list_head *vmas)
 {
 	struct drm_device *dev = params->dev;
-	struct intel_engine_cs *ring = params->ring;
+	struct intel_engine_cs *engine = params->ring;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u64 exec_start, exec_len;
 	int instp_mode;
@@ -1244,8 +1244,8 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
 	if (ret)
 		return ret;
 
-	WARN(params->ctx->ppgtt && params->ctx->ppgtt->pd_dirty_rings & (1<<ring->id),
-	     "%s didn't clear reload\n", ring->name);
+	WARN(params->ctx->ppgtt && params->ctx->ppgtt->pd_dirty_rings & (1<<engine->id),
+	     "%s didn't clear reload\n", engine->name);
 
 	instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
 	instp_mask = I915_EXEC_CONSTANTS_MASK;
@@ -1253,7 +1253,7 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
 	case I915_EXEC_CONSTANTS_REL_GENERAL:
 	case I915_EXEC_CONSTANTS_ABSOLUTE:
 	case I915_EXEC_CONSTANTS_REL_SURFACE:
-		if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
+		if (instp_mode != 0 && engine != &dev_priv->ring[RCS]) {
 			DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
 			return -EINVAL;
 		}
@@ -1280,17 +1280,17 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
 		return -EINVAL;
 	}
 
-	if (ring == &dev_priv->ring[RCS] &&
+	if (engine == &dev_priv->ring[RCS] &&
 	    instp_mode != dev_priv->relative_constants_mode) {
 		ret = intel_ring_begin(params->request, 4);
 		if (ret)
 			return ret;
 
-		intel_ring_emit(ring, MI_NOOP);
-		intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-		intel_ring_emit_reg(ring, INSTPM);
-		intel_ring_emit(ring, instp_mask << 16 | instp_mode);
-		intel_ring_advance(ring);
+		intel_ring_emit(engine, MI_NOOP);
+		intel_ring_emit(engine, MI_LOAD_REGISTER_IMM(1));
+		intel_ring_emit_reg(engine, INSTPM);
+		intel_ring_emit(engine, instp_mask << 16 | instp_mode);
+		intel_ring_advance(engine);
 
 		dev_priv->relative_constants_mode = instp_mode;
 	}
@@ -1308,7 +1308,7 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
 	if (exec_len == 0)
 		exec_len = params->batch_obj->base.size;
 
-	ret = ring->dispatch_execbuffer(params->request,
+	ret = engine->dispatch_execbuffer(params->request,
 					exec_start, exec_len,
 					params->dispatch_flags);
 	if (ret)
@@ -1432,7 +1432,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	struct eb_vmas *eb;
 	struct drm_i915_gem_object *batch_obj;
 	struct drm_i915_gem_exec_object2 shadow_exec_entry;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	struct intel_context *ctx;
 	struct i915_address_space *vm;
 	struct i915_execbuffer_params params_master; /* XXX: will be removed later */
@@ -1459,7 +1459,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	if (args->flags & I915_EXEC_IS_PINNED)
 		dispatch_flags |= I915_DISPATCH_PINNED;
 
-	ret = eb_select_ring(dev_priv, file, args, &ring);
+	ret = eb_select_ring(dev_priv, file, args, &engine);
 	if (ret)
 		return ret;
 
@@ -1473,9 +1473,9 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 			DRM_DEBUG("RS is only allowed for Haswell, Gen8 and above\n");
 			return -EINVAL;
 		}
-		if (ring->id != RCS) {
+		if (engine->id != RCS) {
 			DRM_DEBUG("RS is not available on %s\n",
-				 ring->name);
+				 engine->name);
 			return -EINVAL;
 		}
 
@@ -1488,7 +1488,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	if (ret)
 		goto pre_mutex_err;
 
-	ctx = i915_gem_validate_context(dev, file, ring, ctx_id);
+	ctx = i915_gem_validate_context(dev, file, engine, ctx_id);
 	if (IS_ERR(ctx)) {
 		mutex_unlock(&dev->struct_mutex);
 		ret = PTR_ERR(ctx);
@@ -1522,7 +1522,8 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
 	/* Move the objects en-masse into the GTT, evicting if necessary. */
 	need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
-	ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, ctx, &need_relocs);
+	ret = i915_gem_execbuffer_reserve(engine, &eb->vmas, ctx,
+					  &need_relocs);
 	if (ret)
 		goto err;
 
@@ -1531,7 +1532,8 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 		ret = i915_gem_execbuffer_relocate(eb);
 	if (ret) {
 		if (ret == -EFAULT) {
-			ret = i915_gem_execbuffer_relocate_slow(dev, args, file, ring,
+			ret = i915_gem_execbuffer_relocate_slow(dev, args, file,
+								engine,
 								eb, exec, ctx);
 			BUG_ON(!mutex_is_locked(&dev->struct_mutex));
 		}
@@ -1547,16 +1549,16 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	}
 
 	params->args_batch_start_offset = args->batch_start_offset;
-	if (i915_needs_cmd_parser(ring) && args->batch_len) {
+	if (i915_needs_cmd_parser(engine) && args->batch_len) {
 		struct drm_i915_gem_object *parsed_batch_obj;
 
-		parsed_batch_obj = i915_gem_execbuffer_parse(ring,
-						      &shadow_exec_entry,
-						      eb,
-						      batch_obj,
-						      args->batch_start_offset,
-						      args->batch_len,
-						      file->is_master);
+		parsed_batch_obj = i915_gem_execbuffer_parse(engine,
+							     &shadow_exec_entry,
+							     eb,
+							     batch_obj,
+							     args->batch_start_offset,
+							     args->batch_len,
+							     file->is_master);
 		if (IS_ERR(parsed_batch_obj)) {
 			ret = PTR_ERR(parsed_batch_obj);
 			goto err;
@@ -1608,7 +1610,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 		params->batch_obj_vm_offset = i915_gem_obj_offset(batch_obj, vm);
 
 	/* Allocate a request for this batch buffer nice and early. */
-	req = i915_gem_request_alloc(ring, ctx);
+	req = i915_gem_request_alloc(engine, ctx);
 	if (IS_ERR(req)) {
 		ret = PTR_ERR(req);
 		goto err_batch_unpin;
@@ -1626,7 +1628,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	 */
 	params->dev                     = dev;
 	params->file                    = file;
-	params->ring                    = ring;
+	params->ring                    = engine;
 	params->dispatch_flags          = dispatch_flags;
 	params->batch_obj               = batch_obj;
 	params->ctx                     = ctx;

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -658,7 +658,7 @@ static int gen8_write_pdp(struct drm_i915_gem_request *req,
 			  unsigned entry,
 			  dma_addr_t addr)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	int ret;
 
 	BUG_ON(entry >= 4);
@@ -667,13 +667,13 @@ static int gen8_write_pdp(struct drm_i915_gem_request *req,
 	if (ret)
 		return ret;
 
-	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-	intel_ring_emit_reg(ring, GEN8_RING_PDP_UDW(ring, entry));
-	intel_ring_emit(ring, upper_32_bits(addr));
-	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-	intel_ring_emit_reg(ring, GEN8_RING_PDP_LDW(ring, entry));
-	intel_ring_emit(ring, lower_32_bits(addr));
-	intel_ring_advance(ring);
+	intel_ring_emit(engine, MI_LOAD_REGISTER_IMM(1));
+	intel_ring_emit_reg(engine, GEN8_RING_PDP_UDW(engine, entry));
+	intel_ring_emit(engine, upper_32_bits(addr));
+	intel_ring_emit(engine, MI_LOAD_REGISTER_IMM(1));
+	intel_ring_emit_reg(engine, GEN8_RING_PDP_LDW(engine, entry));
+	intel_ring_emit(engine, lower_32_bits(addr));
+	intel_ring_advance(engine);
 
 	return 0;
 }
@@ -1650,11 +1650,11 @@ static uint32_t get_pd_offset(struct i915_hw_ppgtt *ppgtt)
 static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt,
 			 struct drm_i915_gem_request *req)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	int ret;
 
 	/* NB: TLBs must be flushed and invalidated before a switch */
-	ret = ring->flush(req, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
+	ret = engine->flush(req, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
 	if (ret)
 		return ret;
 
@@ -1662,13 +1662,13 @@ static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt,
 	if (ret)
 		return ret;
 
-	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(2));
-	intel_ring_emit_reg(ring, RING_PP_DIR_DCLV(ring));
-	intel_ring_emit(ring, PP_DIR_DCLV_2G);
-	intel_ring_emit_reg(ring, RING_PP_DIR_BASE(ring));
-	intel_ring_emit(ring, get_pd_offset(ppgtt));
-	intel_ring_emit(ring, MI_NOOP);
-	intel_ring_advance(ring);
+	intel_ring_emit(engine, MI_LOAD_REGISTER_IMM(2));
+	intel_ring_emit_reg(engine, RING_PP_DIR_DCLV(engine));
+	intel_ring_emit(engine, PP_DIR_DCLV_2G);
+	intel_ring_emit_reg(engine, RING_PP_DIR_BASE(engine));
+	intel_ring_emit(engine, get_pd_offset(ppgtt));
+	intel_ring_emit(engine, MI_NOOP);
+	intel_ring_advance(engine);
 
 	return 0;
 }
@@ -1676,22 +1676,22 @@ static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt,
 static int vgpu_mm_switch(struct i915_hw_ppgtt *ppgtt,
 			  struct drm_i915_gem_request *req)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	struct drm_i915_private *dev_priv = to_i915(ppgtt->base.dev);
 
-	I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G);
-	I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt));
+	I915_WRITE(RING_PP_DIR_DCLV(engine), PP_DIR_DCLV_2G);
+	I915_WRITE(RING_PP_DIR_BASE(engine), get_pd_offset(ppgtt));
 	return 0;
 }
 
 static int gen7_mm_switch(struct i915_hw_ppgtt *ppgtt,
 			  struct drm_i915_gem_request *req)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	int ret;
 
 	/* NB: TLBs must be flushed and invalidated before a switch */
-	ret = ring->flush(req, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
+	ret = engine->flush(req, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
 	if (ret)
 		return ret;
 
@@ -1699,17 +1699,17 @@ static int gen7_mm_switch(struct i915_hw_ppgtt *ppgtt,
 	if (ret)
 		return ret;
 
-	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(2));
-	intel_ring_emit_reg(ring, RING_PP_DIR_DCLV(ring));
-	intel_ring_emit(ring, PP_DIR_DCLV_2G);
-	intel_ring_emit_reg(ring, RING_PP_DIR_BASE(ring));
-	intel_ring_emit(ring, get_pd_offset(ppgtt));
-	intel_ring_emit(ring, MI_NOOP);
-	intel_ring_advance(ring);
+	intel_ring_emit(engine, MI_LOAD_REGISTER_IMM(2));
+	intel_ring_emit_reg(engine, RING_PP_DIR_DCLV(engine));
+	intel_ring_emit(engine, PP_DIR_DCLV_2G);
+	intel_ring_emit_reg(engine, RING_PP_DIR_BASE(engine));
+	intel_ring_emit(engine, get_pd_offset(ppgtt));
+	intel_ring_emit(engine, MI_NOOP);
+	intel_ring_advance(engine);
 
 	/* XXX: RCS is the only one to auto invalidate the TLBs? */
-	if (ring->id != RCS) {
-		ret = ring->flush(req, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
+	if (engine->id != RCS) {
+		ret = engine->flush(req, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
 		if (ret)
 			return ret;
 	}
@@ -1720,15 +1720,15 @@ static int gen7_mm_switch(struct i915_hw_ppgtt *ppgtt,
 static int gen6_mm_switch(struct i915_hw_ppgtt *ppgtt,
 			  struct drm_i915_gem_request *req)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	struct drm_device *dev = ppgtt->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 
-	I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G);
-	I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt));
+	I915_WRITE(RING_PP_DIR_DCLV(engine), PP_DIR_DCLV_2G);
+	I915_WRITE(RING_PP_DIR_BASE(engine), get_pd_offset(ppgtt));
 
-	POSTING_READ(RING_PP_DIR_DCLV(ring));
+	POSTING_READ(RING_PP_DIR_DCLV(engine));
 
 	return 0;
 }
@@ -1736,12 +1736,12 @@ static int gen6_mm_switch(struct i915_hw_ppgtt *ppgtt,
 static void gen8_ppgtt_enable(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int j;
 
-	for_each_ring(ring, dev_priv, j) {
+	for_each_ring(engine, dev_priv, j) {
 		u32 four_level = USES_FULL_48BIT_PPGTT(dev) ? GEN8_GFX_PPGTT_48B : 0;
-		I915_WRITE(RING_MODE_GEN7(ring),
+		I915_WRITE(RING_MODE_GEN7(engine),
 			   _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE | four_level));
 	}
 }
@@ -1749,7 +1749,7 @@ static void gen8_ppgtt_enable(struct drm_device *dev)
 static void gen7_ppgtt_enable(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	uint32_t ecochk, ecobits;
 	int i;
 
@@ -1765,9 +1765,9 @@ static void gen7_ppgtt_enable(struct drm_device *dev)
 	}
 	I915_WRITE(GAM_ECOCHK, ecochk);
 
-	for_each_ring(ring, dev_priv, i) {
+	for_each_ring(engine, dev_priv, i) {
 		/* GFX_MODE is per-ring on gen7+ */
-		I915_WRITE(RING_MODE_GEN7(ring),
+		I915_WRITE(RING_MODE_GEN7(engine),
 			   _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 	}
 }
@@ -2286,15 +2286,15 @@ static void undo_idling(struct drm_i915_private *dev_priv, bool interruptible)
 void i915_check_and_clear_faults(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int i;
 
 	if (INTEL_INFO(dev)->gen < 6)
 		return;
 
-	for_each_ring(ring, dev_priv, i) {
+	for_each_ring(engine, dev_priv, i) {
 		u32 fault_reg;
-		fault_reg = I915_READ(RING_FAULT_REG(ring));
+		fault_reg = I915_READ(RING_FAULT_REG(engine));
 		if (fault_reg & RING_FAULT_VALID) {
 			DRM_DEBUG_DRIVER("Unexpected fault\n"
 					 "\tAddr: 0x%08lx\n"
@@ -2305,7 +2305,7 @@ void i915_check_and_clear_faults(struct drm_device *dev)
 					 fault_reg & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT",
 					 RING_FAULT_SRCID(fault_reg),
 					 RING_FAULT_FAULT_TYPE(fault_reg));
-			I915_WRITE(RING_FAULT_REG(ring),
+			I915_WRITE(RING_FAULT_REG(engine),
 				   fault_reg & ~RING_FAULT_VALID);
 		}
 	}

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -495,9 +495,9 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 		if (obj) {
 			u64 wa_ctx_offset = obj->gtt_offset;
 			u32 *wa_ctx_page = &obj->pages[0][0];
-			struct intel_engine_cs *ring = &dev_priv->ring[RCS];
-			u32 wa_ctx_size = (ring->wa_ctx.indirect_ctx.size +
-					   ring->wa_ctx.per_ctx.size);
+			struct intel_engine_cs *engine = &dev_priv->ring[RCS];
+			u32 wa_ctx_size = (engine->wa_ctx.indirect_ctx.size +
+					   engine->wa_ctx.per_ctx.size);
 
 			err_printf(m, "%s --- WA ctx batch buffer = 0x%08llx\n",
 				   dev_priv->ring[i].name, wa_ctx_offset);
@@ -1019,19 +1019,19 @@ static void i915_gem_record_rings(struct drm_device *dev,
 	int i, count;
 
 	for (i = 0; i < I915_NUM_RINGS; i++) {
-		struct intel_engine_cs *ring = &dev_priv->ring[i];
+		struct intel_engine_cs *engine = &dev_priv->ring[i];
 		struct intel_ringbuffer *rbuf;
 
 		error->ring[i].pid = -1;
 
-		if (ring->dev == NULL)
+		if (engine->dev == NULL)
 			continue;
 
 		error->ring[i].valid = true;
 
-		i915_record_ring_state(dev, error, ring, &error->ring[i]);
+		i915_record_ring_state(dev, error, engine, &error->ring[i]);
 
-		request = i915_gem_find_active_request(ring);
+		request = i915_gem_find_active_request(engine);
 		if (request) {
 			struct i915_address_space *vm;
 
@@ -1051,7 +1051,7 @@ static void i915_gem_record_rings(struct drm_device *dev,
 			if (HAS_BROKEN_CS_TLB(dev_priv->dev))
 				error->ring[i].wa_batchbuffer =
 					i915_error_ggtt_object_create(dev_priv,
-							     ring->scratch.obj);
+							     engine->scratch.obj);
 
 			if (request->pid) {
 				struct task_struct *task;
@@ -1073,11 +1073,11 @@ static void i915_gem_record_rings(struct drm_device *dev,
 			 * executed).
 			 */
 			if (request)
-				rbuf = request->ctx->engine[ring->id].ringbuf;
+				rbuf = request->ctx->engine[engine->id].ringbuf;
 			else
-				rbuf = dev_priv->kernel_context->engine[ring->id].ringbuf;
+				rbuf = dev_priv->kernel_context->engine[engine->id].ringbuf;
 		} else
-			rbuf = ring->buffer;
+			rbuf = engine->buffer;
 
 		error->ring[i].cpu_ring_head = rbuf->head;
 		error->ring[i].cpu_ring_tail = rbuf->tail;
@@ -1086,18 +1086,19 @@ static void i915_gem_record_rings(struct drm_device *dev,
 			i915_error_ggtt_object_create(dev_priv, rbuf->obj);
 
 		error->ring[i].hws_page =
-			i915_error_ggtt_object_create(dev_priv, ring->status_page.obj);
+			i915_error_ggtt_object_create(dev_priv,
+						      engine->status_page.obj);
 
-		if (ring->wa_ctx.obj) {
+		if (engine->wa_ctx.obj) {
 			error->ring[i].wa_ctx =
 				i915_error_ggtt_object_create(dev_priv,
-							      ring->wa_ctx.obj);
+							      engine->wa_ctx.obj);
 		}
 
-		i915_gem_record_active_context(ring, error, &error->ring[i]);
+		i915_gem_record_active_context(engine, error, &error->ring[i]);
 
 		count = 0;
-		list_for_each_entry(request, &ring->request_list, list)
+		list_for_each_entry(request, &engine->request_list, list)
 			count++;
 
 		error->ring[i].num_requests = count;
@@ -1110,7 +1111,7 @@ static void i915_gem_record_rings(struct drm_device *dev,
 		}
 
 		count = 0;
-		list_for_each_entry(request, &ring->request_list, list) {
+		list_for_each_entry(request, &engine->request_list, list) {
 			struct drm_i915_error_request *erq;
 
 			if (count >= error->ring[i].num_requests) {

drivers/gpu/drm/i915/i915_guc_submission.c

@@ -377,7 +377,7 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
 			      struct i915_guc_client *client)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	struct intel_context *ctx = client->owner;
 	struct guc_context_desc desc;
 	struct sg_table *sg;
@@ -390,8 +390,8 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
 	desc.priority = client->priority;
 	desc.db_id = client->doorbell_id;
 
-	for_each_ring(ring, dev_priv, i) {
-		struct guc_execlist_context *lrc = &desc.lrc[ring->guc_id];
+	for_each_ring(engine, dev_priv, i) {
+		struct guc_execlist_context *lrc = &desc.lrc[engine->guc_id];
 		struct drm_i915_gem_object *obj;
 		uint64_t ctx_desc;
 
@@ -406,14 +406,14 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
 		if (!obj)
 			break;	/* XXX: continue? */
 
-		ctx_desc = intel_lr_context_descriptor(ctx, ring);
+		ctx_desc = intel_lr_context_descriptor(ctx, engine);
 		lrc->context_desc = (u32)ctx_desc;
 
 		/* The state page is after PPHWSP */
 		lrc->ring_lcra = i915_gem_obj_ggtt_offset(obj) +
 				LRC_STATE_PN * PAGE_SIZE;
 		lrc->context_id = (client->ctx_index << GUC_ELC_CTXID_OFFSET) |
-				(ring->guc_id << GUC_ELC_ENGINE_OFFSET);
+				(engine->guc_id << GUC_ELC_ENGINE_OFFSET);
 
 		obj = ctx->engine[i].ringbuf->obj;
 
@@ -422,7 +422,7 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
 		lrc->ring_next_free_location = lrc->ring_begin;
 		lrc->ring_current_tail_pointer_value = 0;
 
-		desc.engines_used |= (1 << ring->guc_id);
+		desc.engines_used |= (1 << engine->guc_id);
 	}
 
 	WARN_ON(desc.engines_used == 0);
@@ -839,7 +839,7 @@ static void guc_create_ads(struct intel_guc *guc)
 	struct guc_ads *ads;
 	struct guc_policies *policies;
 	struct guc_mmio_reg_state *reg_state;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	struct page *page;
 	u32 size, i;
 
@@ -867,11 +867,11 @@ static void guc_create_ads(struct intel_guc *guc)
 	 * so its address won't change after we've told the GuC where
 	 * to find it.
 	 */
-	ring = &dev_priv->ring[RCS];
-	ads->golden_context_lrca = ring->status_page.gfx_addr;
+	engine = &dev_priv->ring[RCS];
+	ads->golden_context_lrca = engine->status_page.gfx_addr;
 
-	for_each_ring(ring, dev_priv, i)
-		ads->eng_state_size[ring->guc_id] = intel_lr_context_size(ring);
+	for_each_ring(engine, dev_priv, i)
+		ads->eng_state_size[engine->guc_id] = intel_lr_context_size(engine);
 
 	/* GuC scheduling policies */
 	policies = (void *)ads + sizeof(struct guc_ads);
@@ -883,12 +883,12 @@ static void guc_create_ads(struct intel_guc *guc)
 	/* MMIO reg state */
 	reg_state = (void *)policies + sizeof(struct guc_policies);
 
-	for_each_ring(ring, dev_priv, i) {
-		reg_state->mmio_white_list[ring->guc_id].mmio_start =
-			ring->mmio_base + GUC_MMIO_WHITE_LIST_START;
+	for_each_ring(engine, dev_priv, i) {
+		reg_state->mmio_white_list[engine->guc_id].mmio_start =
+			engine->mmio_base + GUC_MMIO_WHITE_LIST_START;
 
 		/* Nothing to be saved or restored for now. */
-		reg_state->mmio_white_list[ring->guc_id].count = 0;
+		reg_state->mmio_white_list[engine->guc_id].count = 0;
 	}
 
 	ads->reg_state_addr = ads->scheduler_policies +

drivers/gpu/drm/i915/i915_irq.c

@@ -1079,11 +1079,11 @@ static u32 vlv_wa_c0_ei(struct drm_i915_private *dev_priv, u32 pm_iir)
 
 static bool any_waiters(struct drm_i915_private *dev_priv)
 {
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int i;
 
-	for_each_ring(ring, dev_priv, i)
-		if (ring->irq_refcount)
+	for_each_ring(engine, dev_priv, i)
+		if (engine->irq_refcount)
 			return true;
 
 	return false;
@@ -2449,7 +2449,7 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
 static void i915_error_wake_up(struct drm_i915_private *dev_priv,
 			       bool reset_completed)
 {
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int i;
 
 	/*
@@ -2460,8 +2460,8 @@ static void i915_error_wake_up(struct drm_i915_private *dev_priv,
 	 */
 
 	/* Wake up __wait_seqno, potentially holding dev->struct_mutex. */
-	for_each_ring(ring, dev_priv, i)
-		wake_up_all(&ring->irq_queue);
+	for_each_ring(engine, dev_priv, i)
+		wake_up_all(&engine->irq_queue);
 
 	/* Wake up intel_crtc_wait_for_pending_flips, holding crtc->mutex. */
 	wake_up_all(&dev_priv->pending_flip_queue);
@@ -2956,11 +2956,11 @@ static int semaphore_passed(struct intel_engine_cs *ring)
 
 static void semaphore_clear_deadlocks(struct drm_i915_private *dev_priv)
 {
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int i;
 
-	for_each_ring(ring, dev_priv, i)
-		ring->hangcheck.deadlock = 0;
+	for_each_ring(engine, dev_priv, i)
+		engine->hangcheck.deadlock = 0;
 }
 
 static bool subunits_stuck(struct intel_engine_cs *ring)
@@ -3071,7 +3071,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
 		container_of(work, typeof(*dev_priv),
 			     gpu_error.hangcheck_work.work);
 	struct drm_device *dev = dev_priv->dev;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int i;
 	int busy_count = 0, rings_hung = 0;
 	bool stuck[I915_NUM_RINGS] = { 0 };
@@ -3096,33 +3096,33 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
 	 */
 	intel_uncore_arm_unclaimed_mmio_detection(dev_priv);
 
-	for_each_ring(ring, dev_priv, i) {
+	for_each_ring(engine, dev_priv, i) {
 		u64 acthd;
 		u32 seqno;
 		bool busy = true;
 
 		semaphore_clear_deadlocks(dev_priv);
 
-		seqno = ring->get_seqno(ring, false);
-		acthd = intel_ring_get_active_head(ring);
+		seqno = engine->get_seqno(engine, false);
+		acthd = intel_ring_get_active_head(engine);
 
-		if (ring->hangcheck.seqno == seqno) {
-			if (ring_idle(ring, seqno)) {
-				ring->hangcheck.action = HANGCHECK_IDLE;
+		if (engine->hangcheck.seqno == seqno) {
+			if (ring_idle(engine, seqno)) {
+				engine->hangcheck.action = HANGCHECK_IDLE;
 
-				if (waitqueue_active(&ring->irq_queue)) {
+				if (waitqueue_active(&engine->irq_queue)) {
 					/* Issue a wake-up to catch stuck h/w. */
-					if (!test_and_set_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings)) {
-						if (!(dev_priv->gpu_error.test_irq_rings & intel_ring_flag(ring)))
+					if (!test_and_set_bit(engine->id, &dev_priv->gpu_error.missed_irq_rings)) {
+						if (!(dev_priv->gpu_error.test_irq_rings & intel_ring_flag(engine)))
 							DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
-								  ring->name);
+								  engine->name);
 						else
 							DRM_INFO("Fake missed irq on %s\n",
-								 ring->name);
-						wake_up_all(&ring->irq_queue);
+								 engine->name);
+						wake_up_all(&engine->irq_queue);
 					}
 					/* Safeguard against driver failure */
-					ring->hangcheck.score += BUSY;
+					engine->hangcheck.score += BUSY;
 				} else
 					busy = false;
 			} else {
@@ -3141,53 +3141,53 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
 				 * being repeatedly kicked and so responsible
 				 * for stalling the machine.
 				 */
-				ring->hangcheck.action = ring_stuck(ring,
-								    acthd);
+				engine->hangcheck.action = ring_stuck(engine,
+								      acthd);
 
-				switch (ring->hangcheck.action) {
+				switch (engine->hangcheck.action) {
 				case HANGCHECK_IDLE:
 				case HANGCHECK_WAIT:
 					break;
 				case HANGCHECK_ACTIVE:
-					ring->hangcheck.score += BUSY;
+					engine->hangcheck.score += BUSY;
 					break;
 				case HANGCHECK_KICK:
-					ring->hangcheck.score += KICK;
+					engine->hangcheck.score += KICK;
 					break;
 				case HANGCHECK_HUNG:
-					ring->hangcheck.score += HUNG;
+					engine->hangcheck.score += HUNG;
 					stuck[i] = true;
 					break;
 				}
 			}
 		} else {
-			ring->hangcheck.action = HANGCHECK_ACTIVE;
+			engine->hangcheck.action = HANGCHECK_ACTIVE;
 
 			/* Gradually reduce the count so that we catch DoS
 			 * attempts across multiple batches.
 			 */
-			if (ring->hangcheck.score > 0)
-				ring->hangcheck.score -= ACTIVE_DECAY;
-			if (ring->hangcheck.score < 0)
-				ring->hangcheck.score = 0;
+			if (engine->hangcheck.score > 0)
+				engine->hangcheck.score -= ACTIVE_DECAY;
+			if (engine->hangcheck.score < 0)
+				engine->hangcheck.score = 0;
 
 			/* Clear head and subunit states on seqno movement */
-			ring->hangcheck.acthd = 0;
+			engine->hangcheck.acthd = 0;
 
-			memset(ring->hangcheck.instdone, 0,
-			       sizeof(ring->hangcheck.instdone));
+			memset(engine->hangcheck.instdone, 0,
+			       sizeof(engine->hangcheck.instdone));
 		}
 
-		ring->hangcheck.seqno = seqno;
-		ring->hangcheck.acthd = acthd;
+		engine->hangcheck.seqno = seqno;
+		engine->hangcheck.acthd = acthd;
 		busy_count += busy;
 	}
 
-	for_each_ring(ring, dev_priv, i) {
-		if (ring->hangcheck.score >= HANGCHECK_SCORE_RING_HUNG) {
+	for_each_ring(engine, dev_priv, i) {
+		if (engine->hangcheck.score >= HANGCHECK_SCORE_RING_HUNG) {
 			DRM_INFO("%s on %s\n",
 				 stuck[i] ? "stuck" : "no progress",
-				 ring->name);
+				 engine->name);
 			rings_hung++;
 		}
 	}

drivers/gpu/drm/i915/intel_display.c

@@ -10984,7 +10984,7 @@ static int intel_gen2_queue_flip(struct drm_device *dev,
 				 struct drm_i915_gem_request *req,
 				 uint32_t flags)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	u32 flip_mask;
 	int ret;
@@ -11000,13 +11000,13 @@ static int intel_gen2_queue_flip(struct drm_device *dev,
 		flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
 	else
 		flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
-	intel_ring_emit(ring, MI_WAIT_FOR_EVENT | flip_mask);
-	intel_ring_emit(ring, MI_NOOP);
-	intel_ring_emit(ring, MI_DISPLAY_FLIP |
+	intel_ring_emit(engine, MI_WAIT_FOR_EVENT | flip_mask);
+	intel_ring_emit(engine, MI_NOOP);
+	intel_ring_emit(engine, MI_DISPLAY_FLIP |
 			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
-	intel_ring_emit(ring, fb->pitches[0]);
-	intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);
-	intel_ring_emit(ring, 0); /* aux display base address, unused */
+	intel_ring_emit(engine, fb->pitches[0]);
+	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
+	intel_ring_emit(engine, 0); /* aux display base address, unused */
 
 	intel_mark_page_flip_active(intel_crtc->unpin_work);
 	return 0;
@@ -11019,7 +11019,7 @@ static int intel_gen3_queue_flip(struct drm_device *dev,
 				 struct drm_i915_gem_request *req,
 				 uint32_t flags)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	u32 flip_mask;
 	int ret;
@@ -11032,13 +11032,13 @@ static int intel_gen3_queue_flip(struct drm_device *dev,
 		flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
 	else
 		flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
-	intel_ring_emit(ring, MI_WAIT_FOR_EVENT | flip_mask);
-	intel_ring_emit(ring, MI_NOOP);
-	intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 |
+	intel_ring_emit(engine, MI_WAIT_FOR_EVENT | flip_mask);
+	intel_ring_emit(engine, MI_NOOP);
+	intel_ring_emit(engine, MI_DISPLAY_FLIP_I915 |
 			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
-	intel_ring_emit(ring, fb->pitches[0]);
-	intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);
-	intel_ring_emit(ring, MI_NOOP);
+	intel_ring_emit(engine, fb->pitches[0]);
+	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
+	intel_ring_emit(engine, MI_NOOP);
 
 	intel_mark_page_flip_active(intel_crtc->unpin_work);
 	return 0;
@@ -11051,7 +11051,7 @@ static int intel_gen4_queue_flip(struct drm_device *dev,
 				 struct drm_i915_gem_request *req,
 				 uint32_t flags)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	uint32_t pf, pipesrc;
@@ -11065,10 +11065,10 @@ static int intel_gen4_queue_flip(struct drm_device *dev,
 	 * Display Registers (which do not change across a page-flip)
 	 * so we need only reprogram the base address.
 	 */
-	intel_ring_emit(ring, MI_DISPLAY_FLIP |
+	intel_ring_emit(engine, MI_DISPLAY_FLIP |
 			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
-	intel_ring_emit(ring, fb->pitches[0]);
-	intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset |
+	intel_ring_emit(engine, fb->pitches[0]);
+	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset |
 			obj->tiling_mode);
 
 	/* XXX Enabling the panel-fitter across page-flip is so far
@@ -11077,7 +11077,7 @@ static int intel_gen4_queue_flip(struct drm_device *dev,
 	 */
 	pf = 0;
 	pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
-	intel_ring_emit(ring, pf | pipesrc);
+	intel_ring_emit(engine, pf | pipesrc);
 
 	intel_mark_page_flip_active(intel_crtc->unpin_work);
 	return 0;
@@ -11090,7 +11090,7 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
 				 struct drm_i915_gem_request *req,
 				 uint32_t flags)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	uint32_t pf, pipesrc;
@@ -11100,10 +11100,10 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
 	if (ret)
 		return ret;
 
-	intel_ring_emit(ring, MI_DISPLAY_FLIP |
+	intel_ring_emit(engine, MI_DISPLAY_FLIP |
 			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
-	intel_ring_emit(ring, fb->pitches[0] | obj->tiling_mode);
-	intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);
+	intel_ring_emit(engine, fb->pitches[0] | obj->tiling_mode);
+	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
 
 	/* Contrary to the suggestions in the documentation,
 	 * "Enable Panel Fitter" does not seem to be required when page
@@ -11113,7 +11113,7 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
 	 */
 	pf = 0;
 	pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
-	intel_ring_emit(ring, pf | pipesrc);
+	intel_ring_emit(engine, pf | pipesrc);
 
 	intel_mark_page_flip_active(intel_crtc->unpin_work);
 	return 0;
@@ -11126,7 +11126,7 @@ static int intel_gen7_queue_flip(struct drm_device *dev,
 				 struct drm_i915_gem_request *req,
 				 uint32_t flags)
 {
-	struct intel_engine_cs *ring = req->ring;
+	struct intel_engine_cs *engine = req->ring;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	uint32_t plane_bit = 0;
 	int len, ret;
@@ -11147,7 +11147,7 @@ static int intel_gen7_queue_flip(struct drm_device *dev,
 	}
 
 	len = 4;
-	if (ring->id == RCS) {
+	if (engine->id == RCS) {
 		len += 6;
 		/*
 		 * On Gen 8, SRM is now taking an extra dword to accommodate
@@ -11185,30 +11185,30 @@ static int intel_gen7_queue_flip(struct drm_device *dev,
 	 * for the RCS also doesn't appear to drop events. Setting the DERRMR
 	 * to zero does lead to lockups within MI_DISPLAY_FLIP.
 	 */
-	if (ring->id == RCS) {
-		intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-		intel_ring_emit_reg(ring, DERRMR);
-		intel_ring_emit(ring, ~(DERRMR_PIPEA_PRI_FLIP_DONE |
-					DERRMR_PIPEB_PRI_FLIP_DONE |
-					DERRMR_PIPEC_PRI_FLIP_DONE));
+	if (engine->id == RCS) {
+		intel_ring_emit(engine, MI_LOAD_REGISTER_IMM(1));
+		intel_ring_emit_reg(engine, DERRMR);
+		intel_ring_emit(engine, ~(DERRMR_PIPEA_PRI_FLIP_DONE |
+					  DERRMR_PIPEB_PRI_FLIP_DONE |
+					  DERRMR_PIPEC_PRI_FLIP_DONE));
 		if (IS_GEN8(dev))
-			intel_ring_emit(ring, MI_STORE_REGISTER_MEM_GEN8 |
+			intel_ring_emit(engine, MI_STORE_REGISTER_MEM_GEN8 |
 					      MI_SRM_LRM_GLOBAL_GTT);
 		else
-			intel_ring_emit(ring, MI_STORE_REGISTER_MEM |
+			intel_ring_emit(engine, MI_STORE_REGISTER_MEM |
 					      MI_SRM_LRM_GLOBAL_GTT);
-		intel_ring_emit_reg(ring, DERRMR);
-		intel_ring_emit(ring, ring->scratch.gtt_offset + 256);
+		intel_ring_emit_reg(engine, DERRMR);
+		intel_ring_emit(engine, engine->scratch.gtt_offset + 256);
 		if (IS_GEN8(dev)) {
-			intel_ring_emit(ring, 0);
-			intel_ring_emit(ring, MI_NOOP);
+			intel_ring_emit(engine, 0);
+			intel_ring_emit(engine, MI_NOOP);
 		}
 	}
 
-	intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 | plane_bit);
-	intel_ring_emit(ring, (fb->pitches[0] | obj->tiling_mode));
-	intel_ring_emit(ring, intel_crtc->unpin_work->gtt_offset);
-	intel_ring_emit(ring, (MI_NOOP));
+	intel_ring_emit(engine, MI_DISPLAY_FLIP_I915 | plane_bit);
+	intel_ring_emit(engine, (fb->pitches[0] | obj->tiling_mode));
+	intel_ring_emit(engine, intel_crtc->unpin_work->gtt_offset);
+	intel_ring_emit(engine, (MI_NOOP));
 
 	intel_mark_page_flip_active(intel_crtc->unpin_work);
 	return 0;
@@ -11488,7 +11488,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	struct drm_plane *primary = crtc->primary;
 	enum pipe pipe = intel_crtc->pipe;
 	struct intel_unpin_work *work;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	bool mmio_flip;
 	struct drm_i915_gem_request *request = NULL;
 	int ret;
@@ -11575,21 +11575,21 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 		work->flip_count = I915_READ(PIPE_FLIPCOUNT_G4X(pipe)) + 1;
 
 	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
-		ring = &dev_priv->ring[BCS];
+		engine = &dev_priv->ring[BCS];
 		if (obj->tiling_mode != intel_fb_obj(work->old_fb)->tiling_mode)
 			/* vlv: DISPLAY_FLIP fails to change tiling */
-			ring = NULL;
+			engine = NULL;
 	} else if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev)) {
-		ring = &dev_priv->ring[BCS];
+		engine = &dev_priv->ring[BCS];
 	} else if (INTEL_INFO(dev)->gen >= 7) {
-		ring = i915_gem_request_get_ring(obj->last_write_req);
-		if (ring == NULL || ring->id != RCS)
-			ring = &dev_priv->ring[BCS];
+		engine = i915_gem_request_get_ring(obj->last_write_req);
+		if (engine == NULL || engine->id != RCS)
+			engine = &dev_priv->ring[BCS];
 	} else {
-		ring = &dev_priv->ring[RCS];
+		engine = &dev_priv->ring[RCS];
 	}
 
-	mmio_flip = use_mmio_flip(ring, obj);
+	mmio_flip = use_mmio_flip(engine, obj);
 
 	/* When using CS flips, we want to emit semaphores between rings.
 	 * However, when using mmio flips we will create a task to do the
@@ -11597,7 +11597,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	 * into the display plane and skip any waits.
 	 */
 	if (!mmio_flip) {
-		ret = i915_gem_object_sync(obj, ring, &request);
+		ret = i915_gem_object_sync(obj, engine, &request);
 		if (ret)
 			goto cleanup_pending;
 	}
@@ -11619,7 +11619,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 					obj->last_write_req);
 	} else {
 		if (!request) {
-			request = i915_gem_request_alloc(ring, NULL);
+			request = i915_gem_request_alloc(engine, NULL);
 			if (IS_ERR(request)) {
 				ret = PTR_ERR(request);
 				goto cleanup_unpin;

drivers/gpu/drm/i915/intel_guc_loader.c

@@ -81,14 +81,14 @@ const char *intel_guc_fw_status_repr(enum intel_guc_fw_status status)
 
 static void direct_interrupts_to_host(struct drm_i915_private *dev_priv)
 {
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int i, irqs;
 
 	/* tell all command streamers NOT to forward interrupts and vblank to GuC */
 	irqs = _MASKED_FIELD(GFX_FORWARD_VBLANK_MASK, GFX_FORWARD_VBLANK_NEVER);
 	irqs |= _MASKED_BIT_DISABLE(GFX_INTERRUPT_STEERING);
-	for_each_ring(ring, dev_priv, i)
-		I915_WRITE(RING_MODE_GEN7(ring), irqs);
+	for_each_ring(engine, dev_priv, i)
+		I915_WRITE(RING_MODE_GEN7(engine), irqs);
 
 	/* route all GT interrupts to the host */
 	I915_WRITE(GUC_BCS_RCS_IER, 0);
@@ -98,14 +98,14 @@ static void direct_interrupts_to_host(struct drm_i915_private *dev_priv)
 
 static void direct_interrupts_to_guc(struct drm_i915_private *dev_priv)
 {
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	int i, irqs;
 
 	/* tell all command streamers to forward interrupts and vblank to GuC */
 	irqs = _MASKED_FIELD(GFX_FORWARD_VBLANK_MASK, GFX_FORWARD_VBLANK_ALWAYS);
 	irqs |= _MASKED_BIT_ENABLE(GFX_INTERRUPT_STEERING);
-	for_each_ring(ring, dev_priv, i)
-		I915_WRITE(RING_MODE_GEN7(ring), irqs);
+	for_each_ring(engine, dev_priv, i)
+		I915_WRITE(RING_MODE_GEN7(engine), irqs);
 
 	/* route USER_INTERRUPT to Host, all others are sent to GuC. */
 	irqs = GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT |

drivers/gpu/drm/i915/intel_mocs.c

@@ -324,11 +324,11 @@ int intel_rcs_context_init_mocs(struct drm_i915_gem_request *req)
 
 	if (get_mocs_settings(req->ring->dev, &t)) {
 		struct drm_i915_private *dev_priv = req->i915;
-		struct intel_engine_cs *ring;
+		struct intel_engine_cs *engine;
 		enum intel_ring_id ring_id;
 
 		/* Program the control registers */
-		for_each_ring(ring, dev_priv, ring_id) {
+		for_each_ring(engine, dev_priv, ring_id) {
 			ret = emit_mocs_control_table(req, &t, ring_id);
 			if (ret)
 				return ret;

drivers/gpu/drm/i915/intel_overlay.c

@@ -233,14 +233,14 @@ static int intel_overlay_on(struct intel_overlay *overlay)
 {
 	struct drm_device *dev = overlay->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring = &dev_priv->ring[RCS];
+	struct intel_engine_cs *engine = &dev_priv->ring[RCS];
 	struct drm_i915_gem_request *req;
 	int ret;
 
 	WARN_ON(overlay->active);
 	WARN_ON(IS_I830(dev) && !(dev_priv->quirks & QUIRK_PIPEA_FORCE));
 
-	req = i915_gem_request_alloc(ring, NULL);
+	req = i915_gem_request_alloc(engine, NULL);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
 
@@ -252,11 +252,11 @@ static int intel_overlay_on(struct intel_overlay *overlay)
 
 	overlay->active = true;
 
-	intel_ring_emit(ring, MI_OVERLAY_FLIP | MI_OVERLAY_ON);
-	intel_ring_emit(ring, overlay->flip_addr | OFC_UPDATE);
-	intel_ring_emit(ring, MI_WAIT_FOR_EVENT | MI_WAIT_FOR_OVERLAY_FLIP);
-	intel_ring_emit(ring, MI_NOOP);
-	intel_ring_advance(ring);
+	intel_ring_emit(engine, MI_OVERLAY_FLIP | MI_OVERLAY_ON);
+	intel_ring_emit(engine, overlay->flip_addr | OFC_UPDATE);
+	intel_ring_emit(engine, MI_WAIT_FOR_EVENT | MI_WAIT_FOR_OVERLAY_FLIP);
+	intel_ring_emit(engine, MI_NOOP);
+	intel_ring_advance(engine);
 
 	return intel_overlay_do_wait_request(overlay, req, NULL);
 }
@@ -267,7 +267,7 @@ static int intel_overlay_continue(struct intel_overlay *overlay,
 {
 	struct drm_device *dev = overlay->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring = &dev_priv->ring[RCS];
+	struct intel_engine_cs *engine = &dev_priv->ring[RCS];
 	struct drm_i915_gem_request *req;
 	u32 flip_addr = overlay->flip_addr;
 	u32 tmp;
@@ -283,7 +283,7 @@ static int intel_overlay_continue(struct intel_overlay *overlay,
 	if (tmp & (1 << 17))
 		DRM_DEBUG("overlay underrun, DOVSTA: %x\n", tmp);
 
-	req = i915_gem_request_alloc(ring, NULL);
+	req = i915_gem_request_alloc(engine, NULL);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
 
@@ -293,9 +293,9 @@ static int intel_overlay_continue(struct intel_overlay *overlay,
 		return ret;
 	}
 
-	intel_ring_emit(ring, MI_OVERLAY_FLIP | MI_OVERLAY_CONTINUE);
-	intel_ring_emit(ring, flip_addr);
-	intel_ring_advance(ring);
+	intel_ring_emit(engine, MI_OVERLAY_FLIP | MI_OVERLAY_CONTINUE);
+	intel_ring_emit(engine, flip_addr);
+	intel_ring_advance(engine);
 
 	WARN_ON(overlay->last_flip_req);
 	i915_gem_request_assign(&overlay->last_flip_req, req);
@@ -336,7 +336,7 @@ static int intel_overlay_off(struct intel_overlay *overlay)
 {
 	struct drm_device *dev = overlay->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring = &dev_priv->ring[RCS];
+	struct intel_engine_cs *engine = &dev_priv->ring[RCS];
 	struct drm_i915_gem_request *req;
 	u32 flip_addr = overlay->flip_addr;
 	int ret;
@@ -349,7 +349,7 @@ static int intel_overlay_off(struct intel_overlay *overlay)
 	 * of the hw. Do it in both cases */
 	flip_addr |= OFC_UPDATE;
 
-	req = i915_gem_request_alloc(ring, NULL);
+	req = i915_gem_request_alloc(engine, NULL);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
 
@@ -360,22 +360,23 @@ static int intel_overlay_off(struct intel_overlay *overlay)
 	}
 
 	/* wait for overlay to go idle */
-	intel_ring_emit(ring, MI_OVERLAY_FLIP | MI_OVERLAY_CONTINUE);
-	intel_ring_emit(ring, flip_addr);
-	intel_ring_emit(ring, MI_WAIT_FOR_EVENT | MI_WAIT_FOR_OVERLAY_FLIP);
+	intel_ring_emit(engine, MI_OVERLAY_FLIP | MI_OVERLAY_CONTINUE);
+	intel_ring_emit(engine, flip_addr);
+	intel_ring_emit(engine, MI_WAIT_FOR_EVENT | MI_WAIT_FOR_OVERLAY_FLIP);
 	/* turn overlay off */
 	if (IS_I830(dev)) {
 		/* Workaround: Don't disable the overlay fully, since otherwise
 		 * it dies on the next OVERLAY_ON cmd. */
-		intel_ring_emit(ring, MI_NOOP);
-		intel_ring_emit(ring, MI_NOOP);
-		intel_ring_emit(ring, MI_NOOP);
+		intel_ring_emit(engine, MI_NOOP);
+		intel_ring_emit(engine, MI_NOOP);
+		intel_ring_emit(engine, MI_NOOP);
 	} else {
-		intel_ring_emit(ring, MI_OVERLAY_FLIP | MI_OVERLAY_OFF);
-		intel_ring_emit(ring, flip_addr);
-		intel_ring_emit(ring, MI_WAIT_FOR_EVENT | MI_WAIT_FOR_OVERLAY_FLIP);
+		intel_ring_emit(engine, MI_OVERLAY_FLIP | MI_OVERLAY_OFF);
+		intel_ring_emit(engine, flip_addr);
+		intel_ring_emit(engine,
+				MI_WAIT_FOR_EVENT | MI_WAIT_FOR_OVERLAY_FLIP);
 	}
-	intel_ring_advance(ring);
+	intel_ring_advance(engine);
 
 	return intel_overlay_do_wait_request(overlay, req, intel_overlay_off_tail);
 }
@@ -408,7 +409,7 @@ static int intel_overlay_release_old_vid(struct intel_overlay *overlay)
 {
 	struct drm_device *dev = overlay->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring = &dev_priv->ring[RCS];
+	struct intel_engine_cs *engine = &dev_priv->ring[RCS];
 	int ret;
 
 	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
@@ -423,7 +424,7 @@ static int intel_overlay_release_old_vid(struct intel_overlay *overlay)
 		/* synchronous slowpath */
 		struct drm_i915_gem_request *req;
 
-		req = i915_gem_request_alloc(ring, NULL);
+		req = i915_gem_request_alloc(engine, NULL);
 		if (IS_ERR(req))
 			return PTR_ERR(req);
 
@@ -433,9 +434,10 @@ static int intel_overlay_release_old_vid(struct intel_overlay *overlay)
 			return ret;
 		}
 
-		intel_ring_emit(ring, MI_WAIT_FOR_EVENT | MI_WAIT_FOR_OVERLAY_FLIP);
-		intel_ring_emit(ring, MI_NOOP);
-		intel_ring_advance(ring);
+		intel_ring_emit(engine,
+				MI_WAIT_FOR_EVENT | MI_WAIT_FOR_OVERLAY_FLIP);
+		intel_ring_emit(engine, MI_NOOP);
+		intel_ring_advance(engine);
 
 		ret = intel_overlay_do_wait_request(overlay, req,
 						    intel_overlay_release_old_vid_tail);

drivers/gpu/drm/i915/intel_pm.c

@@ -4815,7 +4815,7 @@ static void gen9_enable_rps(struct drm_device *dev)
 static void gen9_enable_rc6(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	uint32_t rc6_mask = 0;
 	int unused;
 
@@ -4838,8 +4838,8 @@ static void gen9_enable_rc6(struct drm_device *dev)
 		I915_WRITE(GEN6_RC6_WAKE_RATE_LIMIT, 54 << 16);
 	I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
 	I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
-	for_each_ring(ring, dev_priv, unused)
-		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
+	for_each_ring(engine, dev_priv, unused)
+		I915_WRITE(RING_MAX_IDLE(engine->mmio_base), 10);
 
 	if (HAS_GUC_UCODE(dev))
 		I915_WRITE(GUC_MAX_IDLE_COUNT, 0xA);
@@ -4885,7 +4885,7 @@ static void gen9_enable_rc6(struct drm_device *dev)
 static void gen8_enable_rps(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	uint32_t rc6_mask = 0;
 	int unused;
 
@@ -4906,8 +4906,8 @@ static void gen8_enable_rps(struct drm_device *dev)
 	I915_WRITE(GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16);
 	I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
 	I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
-	for_each_ring(ring, dev_priv, unused)
-		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
+	for_each_ring(engine, dev_priv, unused)
+		I915_WRITE(RING_MAX_IDLE(engine->mmio_base), 10);
 	I915_WRITE(GEN6_RC_SLEEP, 0);
 	if (IS_BROADWELL(dev))
 		I915_WRITE(GEN6_RC6_THRESHOLD, 625); /* 800us/1.28 for TO */
@@ -4967,7 +4967,7 @@ static void gen8_enable_rps(struct drm_device *dev)
 static void gen6_enable_rps(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	u32 rc6vids, pcu_mbox = 0, rc6_mask = 0;
 	u32 gtfifodbg;
 	int rc6_mode;
@@ -5003,8 +5003,8 @@ static void gen6_enable_rps(struct drm_device *dev)
 	I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000);
 	I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25);
 
-	for_each_ring(ring, dev_priv, i)
-		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
+	for_each_ring(engine, dev_priv, i)
+		I915_WRITE(RING_MAX_IDLE(engine->mmio_base), 10);
 
 	I915_WRITE(GEN6_RC_SLEEP, 0);
 	I915_WRITE(GEN6_RC1e_THRESHOLD, 1000);
@@ -5495,7 +5495,7 @@ static void valleyview_cleanup_gt_powersave(struct drm_device *dev)
 static void cherryview_enable_rps(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	u32 gtfifodbg, val, rc6_mode = 0, pcbr;
 	int i;
 
@@ -5522,8 +5522,8 @@ static void cherryview_enable_rps(struct drm_device *dev)
 	I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000); /* 12500 * 1280ns */
 	I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25); /* 25 * 1280ns */
 
-	for_each_ring(ring, dev_priv, i)
-		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
+	for_each_ring(engine, dev_priv, i)
+		I915_WRITE(RING_MAX_IDLE(engine->mmio_base), 10);
 	I915_WRITE(GEN6_RC_SLEEP, 0);
 
 	/* TO threshold set to 500 us ( 0x186 * 1.28 us) */
@@ -5593,7 +5593,7 @@ static void cherryview_enable_rps(struct drm_device *dev)
 static void valleyview_enable_rps(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	u32 gtfifodbg, val, rc6_mode = 0;
 	int i;
 
@@ -5633,8 +5633,8 @@ static void valleyview_enable_rps(struct drm_device *dev)
 	I915_WRITE(GEN6_RC_EVALUATION_INTERVAL, 125000);
 	I915_WRITE(GEN6_RC_IDLE_HYSTERSIS, 25);
 
-	for_each_ring(ring, dev_priv, i)
-		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
+	for_each_ring(engine, dev_priv, i)
+		I915_WRITE(RING_MAX_IDLE(engine->mmio_base), 10);
 
 	I915_WRITE(GEN6_RC6_THRESHOLD, 0x557);
 
@@ -6010,7 +6010,7 @@ EXPORT_SYMBOL_GPL(i915_gpu_lower);
 bool i915_gpu_busy(void)
 {
 	struct drm_i915_private *dev_priv;
-	struct intel_engine_cs *ring;
+	struct intel_engine_cs *engine;
 	bool ret = false;
 	int i;
 
@@ -6019,8 +6019,8 @@ bool i915_gpu_busy(void)
 		goto out_unlock;
 	dev_priv = i915_mch_dev;
 
-	for_each_ring(ring, dev_priv, i)
-		ret |= !list_empty(&ring->request_list);
+	for_each_ring(engine, dev_priv, i)
+		ret |= !list_empty(&engine->request_list);
 
 out_unlock:
 	spin_unlock_irq(&mchdev_lock);

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -63,16 +63,16 @@ struct  intel_hw_status_page {
 	((from) * I915_NUM_RINGS * i915_semaphore_seqno_size) + \
 	(i915_semaphore_seqno_size * (__ring)->id))
 
-#define GEN8_RING_SEMAPHORE_INIT do { \
+#define GEN8_RING_SEMAPHORE_INIT(e) do { \
 	if (!dev_priv->semaphore_obj) { \
 		break; \
 	} \
-	ring->semaphore.signal_ggtt[RCS] = GEN8_SIGNAL_OFFSET(ring, RCS); \
-	ring->semaphore.signal_ggtt[VCS] = GEN8_SIGNAL_OFFSET(ring, VCS); \
-	ring->semaphore.signal_ggtt[BCS] = GEN8_SIGNAL_OFFSET(ring, BCS); \
-	ring->semaphore.signal_ggtt[VECS] = GEN8_SIGNAL_OFFSET(ring, VECS); \
-	ring->semaphore.signal_ggtt[VCS2] = GEN8_SIGNAL_OFFSET(ring, VCS2); \
-	ring->semaphore.signal_ggtt[ring->id] = MI_SEMAPHORE_SYNC_INVALID; \
+	(e)->semaphore.signal_ggtt[RCS] = GEN8_SIGNAL_OFFSET((e), RCS); \
+	(e)->semaphore.signal_ggtt[VCS] = GEN8_SIGNAL_OFFSET((e), VCS); \
+	(e)->semaphore.signal_ggtt[BCS] = GEN8_SIGNAL_OFFSET((e), BCS); \
+	(e)->semaphore.signal_ggtt[VECS] = GEN8_SIGNAL_OFFSET((e), VECS); \
+	(e)->semaphore.signal_ggtt[VCS2] = GEN8_SIGNAL_OFFSET((e), VCS2); \
+	(e)->semaphore.signal_ggtt[(e)->id] = MI_SEMAPHORE_SYNC_INVALID; \
 	} while(0)
 
 enum intel_ring_hangcheck_action {