3 files changed, 54 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 276329b7b10c..7d378f7ebaa4 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1537,6 +1537,37 @@ static int msm_ioctl_deregister_event(struct drm_device *dev, void *data,
 	return 0;
 }
 
+static int msm_ioctl_gem_sync(struct drm_device *dev, void *data,
+			     struct drm_file *file)
+{
+
+	struct drm_msm_gem_sync *arg = data;
+	int i;
+
+	for (i = 0; i < arg->nr_ops; i++) {
+		struct drm_msm_gem_syncop syncop;
+		struct drm_gem_object *obj;
+		int ret;
+		void __user *ptr =
+			(void __user *)(uintptr_t)
+				(arg->ops + (i * sizeof(syncop)));
+
+		ret = copy_from_user(&syncop, ptr, sizeof(syncop));
+		if (ret)
+			return -EFAULT;
+
+		obj = drm_gem_object_lookup(dev, file, syncop.handle);
+		if (!obj)
+			return -ENOENT;
+
+		msm_gem_sync(obj, syncop.op);
+
+		drm_gem_object_unreference_unlocked(obj);
+	}
+
+	return 0;
+}
+
 void msm_send_crtc_notification(struct drm_crtc *crtc,
 				struct drm_event *event, u8 *payload)
 {
@@ -1665,6 +1696,8 @@ static const struct drm_ioctl_desc msm_ioctls[] = {
 			  DRM_AUTH|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(MSM_COUNTER_READ, msm_ioctl_counter_read,
 			  DRM_AUTH|DRM_RENDER_ALLOW),
+	DRM_IOCTL_DEF_DRV(MSM_GEM_SYNC, msm_ioctl_gem_sync,
+			  DRM_AUTH|DRM_RENDER_ALLOW),
 };
 
 static const struct vm_operations_struct vm_ops = {
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index d2d118cf7e07..943d73fa544d 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -469,6 +469,7 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 		uint32_t size, uint32_t flags);
 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 		uint32_t size, struct sg_table *sgt);
+void msm_gem_sync(struct drm_gem_object *obj, u32 op);
 
 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
 		struct msm_gem_address_space *aspace);
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index d1455fbc980e..d35d03c2935d 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -546,6 +546,26 @@ int msm_gem_cpu_fini(struct drm_gem_object *obj)
 	return 0;
 }
 
+void msm_gem_sync(struct drm_gem_object *obj, u32 op)
+{
+	struct drm_device *dev = obj->dev;
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
+		return;
+
+	switch (op) {
+	case MSM_GEM_SYNC_TO_CPU:
+		dma_sync_sg_for_cpu(dev->dev, msm_obj->sgt->sgl,
+			msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
+		break;
+	case MSM_GEM_SYNC_TO_DEV:
+		dma_sync_sg_for_device(dev->dev, msm_obj->sgt->sgl,
+			msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
+		break;
+	}
+}
+
 #ifdef CONFIG_DEBUG_FS
 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 {