accel/habanalabs: always pass exported size to alloc_sgt_from_device_pages()

For Gaudi1 the exported dma-buf is always composed of a single page, and
therefore the exported size is equal to this page's size.
When calling alloc_sgt_from_device_pages(), we pass 0 as the exported
size and internally calculate it as "number of pages * page size".
This makes alloc_sgt_from_device_pages() less clear, because the
exported size parameter is not understood as a restriction on the pages'
size.
Modify to always pass the exported size explicitly.
Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/accel/habanalabs/common/memory.c

@@ -1561,8 +1561,7 @@ static struct sg_table *alloc_sgt_from_device_pages(struct hl_device *hdev, u64
 	if (!sgt)
 		return ERR_PTR(-ENOMEM);
 
-	/* remove export size restrictions in case not explicitly defined */
-	cur_size_to_export = exported_size ? exported_size : (npages * page_size);
+	cur_size_to_export = exported_size;
 
 	/* If the size of each page is larger than the dma max segment size,
 	 * then we can't combine pages and the number of entries in the SGL
@@ -1728,7 +1727,7 @@ static struct sg_table *hl_map_dmabuf(struct dma_buf_attachment *attachment,
 						&hl_dmabuf->device_address,
 						1,
 						hl_dmabuf->dmabuf->size,
-						0,
+						hl_dmabuf->dmabuf->size,
 						attachment->dev,
 						dir);