gpu: ion: add generic function for creating chunked sg tables
Add a helper function to create sg tables composed of items of some
given chunk size.
Change-Id: I91466269ad2c1326d61ceb5df99178a7a488a7bb
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
diff --git a/drivers/gpu/ion/ion_priv.h b/drivers/gpu/ion/ion_priv.h
index 6cf10fe..0ad33ad 100644
--- a/drivers/gpu/ion/ion_priv.h
+++ b/drivers/gpu/ion/ion_priv.h
@@ -332,4 +332,16 @@
int ion_heap_allow_heap_secure(enum ion_heap_type type);
int ion_heap_allow_handle_secure(enum ion_heap_type type);
+
+/**
+ * ion_create_chunked_sg_table - helper function to create sg table
+ * with specified chunk size
+ * @buffer_base: The starting address used for the sg dma address
+ * @chunk_size: The size of each entry in the sg table
+ * @total_size: The total size of the sg table (i.e. the sum of the
+ * entries). This will be rounded up to the nearest
+ * multiple of `chunk_size'
+ */
+struct sg_table *ion_create_chunked_sg_table(phys_addr_t buffer_base,
+ size_t chunk_size, size_t total_size);
#endif /* _ION_PRIV_H */