drm/i915/gvt: properly access enabled intel_engine_cs

Switch to use new for_each_engine() helper to properly access
enabled intel_engine_cs as i915 core has changed that to be
dynamic managed. At GVT-g init time would still depend on ring
mask to determine engine list as it's earlier.
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/execlist.c

@@ -817,10 +817,11 @@ void intel_vgpu_clean_execlist(struct intel_vgpu *vgpu)
 
 int intel_vgpu_init_execlist(struct intel_vgpu *vgpu)
 {
-	int i;
+	enum intel_engine_id i;
+	struct intel_engine_cs *engine;
 
 	/* each ring has a virtual execlist engine */
-	for (i = 0; i < I915_NUM_ENGINES; i++) {
+	for_each_engine(engine, vgpu->gvt->dev_priv, i) {
 		init_vgpu_execlist(vgpu, i);
 		INIT_LIST_HEAD(&vgpu->workload_q_head[i]);
 	}

drivers/gpu/drm/i915/gvt/handlers.c

@@ -132,12 +132,13 @@ static int new_mmio_info(struct intel_gvt *gvt,
 
 static int render_mmio_to_ring_id(struct intel_gvt *gvt, unsigned int reg)
 {
-	int i;
+	enum intel_engine_id id;
+	struct intel_engine_cs *engine;
 
 	reg &= ~GENMASK(11, 0);
-	for (i = 0; i < I915_NUM_ENGINES; i++) {
-		if (gvt->dev_priv->engine[i]->mmio_base == reg)
-			return i;
+	for_each_engine(engine, gvt->dev_priv, id) {
+		if (engine->mmio_base == reg)
+			return id;
 	}
 	return -1;
 }
@@ -1306,7 +1307,7 @@ static int elsp_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
 	u32 data = *(u32 *)p_data;
 	int ret;
 
-	if (WARN_ON(ring_id < 0))
+	if (WARN_ON(ring_id < 0 || ring_id > I915_NUM_ENGINES - 1))
 		return -EINVAL;
 
 	execlist = &vgpu->execlist[ring_id];

drivers/gpu/drm/i915/gvt/sched_policy.c

@@ -37,9 +37,10 @@
 static bool vgpu_has_pending_workload(struct intel_vgpu *vgpu)
 {
 	struct intel_vgpu_execlist *execlist;
-	int i;
+	enum intel_engine_id i;
+	struct intel_engine_cs *engine;
 
-	for (i = 0; i < I915_NUM_ENGINES; i++) {
+	for_each_engine(engine, vgpu->gvt->dev_priv, i) {
 		execlist = &vgpu->execlist[i];
 		if (!list_empty(workload_q_head(vgpu, i)))
 			return true;
@@ -51,7 +52,8 @@ static bool vgpu_has_pending_workload(struct intel_vgpu *vgpu)
 static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
 {
 	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
-	int i;
+	enum intel_engine_id i;
+	struct intel_engine_cs *engine;
 
 	/* no target to schedule */
 	if (!scheduler->next_vgpu)
@@ -67,7 +69,7 @@ static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
 	scheduler->need_reschedule = true;
 
 	/* still have uncompleted workload? */
-	for (i = 0; i < I915_NUM_ENGINES; i++) {
+	for_each_engine(engine, gvt->dev_priv, i) {
 		if (scheduler->current_workload[i]) {
 			gvt_dbg_sched("still have running workload\n");
 			return;
@@ -84,7 +86,7 @@ static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
 	scheduler->need_reschedule = false;
 
 	/* wake up workload dispatch thread */
-	for (i = 0; i < I915_NUM_ENGINES; i++)
+	for_each_engine(engine, gvt->dev_priv, i)
 		wake_up(&scheduler->waitq[i]);
 }
 

drivers/gpu/drm/i915/gvt/scheduler.c

@@ -510,6 +510,10 @@ int intel_gvt_init_workload_scheduler(struct intel_gvt *gvt)
 	init_waitqueue_head(&scheduler->workload_complete_wq);
 
 	for (i = 0; i < I915_NUM_ENGINES; i++) {
+		/* check ring mask at init time */
+		if (!HAS_ENGINE(gvt->dev_priv, i))
+			continue;
+
 		init_waitqueue_head(&scheduler->waitq[i]);
 
 		param = kzalloc(sizeof(*param), GFP_KERNEL);