[PATCH 1/3] virtio: Add virtio_gpu_object_kunmap()

[Ezequiel Garcia]

Implement a virtio_gpu_object_kunmap() to unmap the kernel
mapping, and use it in the TTM object destroy path.

Signed-off-by: Ezequiel Garcia <ezequiel at collabora.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h    | 1 +
 drivers/gpu/drm/virtio/virtgpu_object.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 2de29c90bed2..a8af46570a01 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -356,6 +356,7 @@ void virtio_gpu_fence_event_process(struct virtio_gpu_device *vdev,
 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 			     unsigned long size, bool kernel, bool pinned,
 			     struct virtio_gpu_object **bo_ptr);
+void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo);
 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr);
 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
 				   struct virtio_gpu_object *bo);
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index 9f2f470efd9b..113eae00d293 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -37,6 +37,8 @@ static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
 		virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
 	if (bo->pages)
 		virtio_gpu_object_free_sg_table(bo);
+	if (bo->vmap)
+		virtio_gpu_object_kunmap(bo);
 	drm_gem_object_release(&bo->gem_base);
 	kfree(bo);
 }
@@ -99,6 +101,12 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 	return 0;
 }
 
+void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
+{
+	bo->vmap = NULL;
+	ttm_bo_kunmap(&bo->kmap);
+}
+
 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr)
 {
 	bool is_iomem;
-- 
2.19.0.rc2