1 files changed, 18 insertions, 0 deletions

diff --git a/include/linux/nvmap.h b/include/linux/nvmap.h
index b8d267691..7a8181ca5 100644
--- a/include/linux/nvmap.h
+++ b/include/linux/nvmap.h
@@ -65,6 +65,24 @@ ulong nvmap_iovmm_get_used_pages(void);
 int nvmap_register_vidmem_carveout(struct device *dma_dev,
                 phys_addr_t base, size_t size);
 
+/* The following two functions are to help enable DRAM
+ * overprovising via paging. These functions allow the
+ * physical frames backing an nvmap dma_buf to be freed
+ * (for example, after their contents has been saved
+ * elsewhere by paging logic), and to be reallocated
+ * (such as when other code is ready to repopulate them).
+ * Both functions preserve any open nvmap handles.
+ */
+int nvmap_dealloc_dmabuf(struct dma_buf *dmabuf);
+int nvmap_realloc_dmabuf(struct dma_buf *dmabuf);
+
+/* Some drivers (such as nvgpu) store parallel structures
+ * for each dmabuf to track internal state. To allow these
+ * drivers to quickly access their state from a *dmabuf or
+ * FD, we allow them access to a per-dmabuf list_head.
+ */
+struct list_head* nvmap_get_priv_list(struct dma_buf *dmabuf);
+
 /*
  * A heap can be mapped to memory other than DRAM.
  * The HW, controls the memory, can be power gated/ungated