drm/i915/gvt: Invalidate vGPU PPGTT mm objects during a vGPU reset.

As different OSes might handling GVT PPGTT creation/destroy notification
differently during a vGPU reset. A better approach is invalidating all
vGPU PPGTT mm objects during vGPU reset.
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

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

@@ -2290,6 +2290,28 @@ void intel_gvt_clean_gtt(struct intel_gvt *gvt)
 		clean_spt_oos(gvt);
 }
 
+/**
+ * intel_vgpu_invalidate_ppgtt - invalidate PPGTT instances
+ * @vgpu: a vGPU
+ *
+ * This function is called when invalidate all PPGTT instances of a vGPU.
+ *
+ */
+void intel_vgpu_invalidate_ppgtt(struct intel_vgpu *vgpu)
+{
+	struct list_head *pos, *n;
+	struct intel_vgpu_mm *mm;
+
+	list_for_each_safe(pos, n, &vgpu->gtt.ppgtt_mm_list_head) {
+		mm = container_of(pos, struct intel_vgpu_mm, ppgtt_mm.list);
+		if (mm->type == INTEL_GVT_MM_PPGTT) {
+			list_del_init(&mm->ppgtt_mm.lru_list);
+			if (mm->ppgtt_mm.shadowed)
+				invalidate_ppgtt_mm(mm);
+		}
+	}
+}
+
 /**
  * intel_vgpu_reset_ggtt - reset the GGTT entry
  * @vgpu: a vGPU

drivers/gpu/drm/i915/gvt/gtt.h

@@ -194,6 +194,7 @@ struct intel_vgpu_gtt {
 extern int intel_vgpu_init_gtt(struct intel_vgpu *vgpu);
 extern void intel_vgpu_clean_gtt(struct intel_vgpu *vgpu);
 void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu);
+void intel_vgpu_invalidate_ppgtt(struct intel_vgpu *vgpu);
 
 extern int intel_gvt_init_gtt(struct intel_gvt *gvt);
 void intel_vgpu_reset_gtt(struct intel_vgpu *vgpu);

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

@@ -522,6 +522,7 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 	/* full GPU reset or device model level reset */
 	if (engine_mask == ALL_ENGINES || dmlr) {
 		intel_vgpu_select_submission_ops(vgpu, ALL_ENGINES, 0);
+		intel_vgpu_invalidate_ppgtt(vgpu);
 		/*fence will not be reset during virtual reset */
 		if (dmlr) {
 			intel_vgpu_reset_gtt(vgpu);