drm/i915/gvt: free workload in vgpu release

Some workloads may be prepared in vgpu's queue but not be scheduled
to run yet. If vgpu is released at this time, they will not be freed
in workload complete callback and so need to be freed in vgpu release
operation.

Add new vgpu_release operation in gvt_ops to stop vgpu and release
runtime resources. gvt_ops vgpu_deactivate operation will only stop
vgpu.

v2: add new gvt ops to clean vgpu running status (Xiong Zhang)
Signed-off-by: Hang Yuan <hang.yuan@linux.intel.com>
Reviewed-by: Xiong Zhang <xiong.y.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

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

@@ -176,6 +176,7 @@ static const struct intel_gvt_ops intel_gvt_ops = {
 	.emulate_mmio_write = intel_vgpu_emulate_mmio_write,
 	.vgpu_create = intel_gvt_create_vgpu,
 	.vgpu_destroy = intel_gvt_destroy_vgpu,
+	.vgpu_release = intel_gvt_release_vgpu,
 	.vgpu_reset = intel_gvt_reset_vgpu,
 	.vgpu_activate = intel_gvt_activate_vgpu,
 	.vgpu_deactivate = intel_gvt_deactivate_vgpu,

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

@@ -486,6 +486,7 @@ void intel_gvt_destroy_idle_vgpu(struct intel_vgpu *vgpu);
 struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
 					 struct intel_vgpu_type *type);
 void intel_gvt_destroy_vgpu(struct intel_vgpu *vgpu);
+void intel_gvt_release_vgpu(struct intel_vgpu *vgpu);
 void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 				 unsigned int engine_mask);
 void intel_gvt_reset_vgpu(struct intel_vgpu *vgpu);
@@ -563,7 +564,8 @@ struct intel_gvt_ops {
 				unsigned int);
 	struct intel_vgpu *(*vgpu_create)(struct intel_gvt *,
 				struct intel_vgpu_type *);
-	void (*vgpu_destroy)(struct intel_vgpu *);
+	void (*vgpu_destroy)(struct intel_vgpu *vgpu);
+	void (*vgpu_release)(struct intel_vgpu *vgpu);
 	void (*vgpu_reset)(struct intel_vgpu *);
 	void (*vgpu_activate)(struct intel_vgpu *);
 	void (*vgpu_deactivate)(struct intel_vgpu *);

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

@@ -666,7 +666,7 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
 	if (atomic_cmpxchg(&vgpu->vdev.released, 0, 1))
 		return;
 
-	intel_gvt_ops->vgpu_deactivate(vgpu);
+	intel_gvt_ops->vgpu_release(vgpu);
 
 	ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_IOMMU_NOTIFY,
 					&vgpu->vdev.iommu_notifier);

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

@@ -784,7 +784,8 @@ static void update_guest_context(struct intel_vgpu_workload *workload)
 	kunmap(page);
 }
 
-static void clean_workloads(struct intel_vgpu *vgpu, unsigned long engine_mask)
+void intel_vgpu_clean_workloads(struct intel_vgpu *vgpu,
+				unsigned long engine_mask)
 {
 	struct intel_vgpu_submission *s = &vgpu->submission;
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
@@ -879,7 +880,7 @@ static void complete_current_workload(struct intel_gvt *gvt, int ring_id)
 		 * cleaned up during the resetting process later, so doing
 		 * the workload clean up here doesn't have any impact.
 		 **/
-		clean_workloads(vgpu, ENGINE_MASK(ring_id));
+		intel_vgpu_clean_workloads(vgpu, ENGINE_MASK(ring_id));
 	}
 
 	workload->complete(workload);
@@ -1081,7 +1082,7 @@ void intel_vgpu_reset_submission(struct intel_vgpu *vgpu,
 	if (!s->active)
 		return;
 
-	clean_workloads(vgpu, engine_mask);
+	intel_vgpu_clean_workloads(vgpu, engine_mask);
 	s->ops->reset(vgpu, engine_mask);
 }
 

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

@@ -158,4 +158,7 @@ intel_vgpu_create_workload(struct intel_vgpu *vgpu, int ring_id,
 
 void intel_vgpu_destroy_workload(struct intel_vgpu_workload *workload);
 
+void intel_vgpu_clean_workloads(struct intel_vgpu *vgpu,
+				unsigned long engine_mask);
+
 #endif

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

@@ -222,7 +222,7 @@ void intel_gvt_activate_vgpu(struct intel_vgpu *vgpu)
  * @vgpu: virtual GPU
  *
  * This function is called when user wants to deactivate a virtual GPU.
- * All virtual GPU runtime information will be destroyed.
+ * The virtual GPU will be stopped.
  *
  */
 void intel_gvt_deactivate_vgpu(struct intel_vgpu *vgpu)
@@ -238,11 +238,29 @@ void intel_gvt_deactivate_vgpu(struct intel_vgpu *vgpu)
 	}
 
 	intel_vgpu_stop_schedule(vgpu);
-	intel_vgpu_dmabuf_cleanup(vgpu);
 
 	mutex_unlock(&vgpu->vgpu_lock);
 }
 
+/**
+ * intel_gvt_release_vgpu - release a virtual GPU
+ * @vgpu: virtual GPU
+ *
+ * This function is called when user wants to release a virtual GPU.
+ * The virtual GPU will be stopped and all runtime information will be
+ * destroyed.
+ *
+ */
+void intel_gvt_release_vgpu(struct intel_vgpu *vgpu)
+{
+	intel_gvt_deactivate_vgpu(vgpu);
+
+	mutex_lock(&vgpu->vgpu_lock);
+	intel_vgpu_clean_workloads(vgpu, ALL_ENGINES);
+	intel_vgpu_dmabuf_cleanup(vgpu);
+	mutex_unlock(&vgpu->vgpu_lock);
+}
+
 /**
  * intel_gvt_destroy_vgpu - destroy a virtual GPU
  * @vgpu: virtual GPU