1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xen/xen_drm_front_shbuf.h b/drivers/gpu/drm/xen/xen_drm_front_shbuf.h
new file mode 100644
index 000000000000..7545c692539e
--- /dev/null
+++ b/drivers/gpu/drm/xen/xen_drm_front_shbuf.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+
+/*
+ *  Xen para-virtual DRM device
+ *
+ * Copyright (C) 2016-2018 EPAM Systems Inc.
+ *
+ * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
+ */
+
+#ifndef __XEN_DRM_FRONT_SHBUF_H_
+#define __XEN_DRM_FRONT_SHBUF_H_
+
+#include <linux/kernel.h>
+#include <linux/scatterlist.h>
+
+#include <xen/grant_table.h>
+
+struct xen_drm_front_shbuf {
+	/*
+	 * number of references granted for the backend use:
+	 *  - for allocated/imported dma-buf's this holds number of grant
+	 *    references for the page directory and pages of the buffer
+	 *  - for the buffer provided by the backend this holds number of
+	 *    grant references for the page directory as grant references for
+	 *    the buffer will be provided by the backend
+	 */
+	int num_grefs;
+	grant_ref_t *grefs;
+	unsigned char *directory;
+
+	int num_pages;
+	struct page **pages;
+
+	struct xenbus_device *xb_dev;
+
+	/* these are the ops used internally depending on be_alloc mode */
+	const struct xen_drm_front_shbuf_ops *ops;
+
+	/* Xen map handles for the buffer allocated by the backend */
+	grant_handle_t *backend_map_handles;
+};
+
+struct xen_drm_front_shbuf_cfg {
+	struct xenbus_device *xb_dev;
+	size_t size;
+	struct page **pages;
+	bool be_alloc;
+};
+
+struct xen_drm_front_shbuf *
+xen_drm_front_shbuf_alloc(struct xen_drm_front_shbuf_cfg *cfg);
+
+grant_ref_t xen_drm_front_shbuf_get_dir_start(struct xen_drm_front_shbuf *buf);
+
+int xen_drm_front_shbuf_map(struct xen_drm_front_shbuf *buf);
+
+int xen_drm_front_shbuf_unmap(struct xen_drm_front_shbuf *buf);
+
+void xen_drm_front_shbuf_flush(struct xen_drm_front_shbuf *buf);
+
+void xen_drm_front_shbuf_free(struct xen_drm_front_shbuf *buf);
+
+#endif /* __XEN_DRM_FRONT_SHBUF_H_ */