1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */ 2 3 /* 4 * Xen para-virtual DRM device 5 * 6 * Copyright (C) 2016-2018 EPAM Systems Inc. 7 * 8 * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> 9 */ 10 11 #ifndef __XEN_DRM_FRONT_SHBUF_H_ 12 #define __XEN_DRM_FRONT_SHBUF_H_ 13 14 #include <linux/kernel.h> 15 #include <linux/scatterlist.h> 16 17 #include <xen/grant_table.h> 18 19 struct xen_drm_front_shbuf { 20 /* 21 * number of references granted for the backend use: 22 * - for allocated/imported dma-buf's this holds number of grant 23 * references for the page directory and pages of the buffer 24 * - for the buffer provided by the backend this holds number of 25 * grant references for the page directory as grant references for 26 * the buffer will be provided by the backend 27 */ 28 int num_grefs; 29 grant_ref_t *grefs; 30 unsigned char *directory; 31 32 int num_pages; 33 struct page **pages; 34 35 struct xenbus_device *xb_dev; 36 37 /* these are the ops used internally depending on be_alloc mode */ 38 const struct xen_drm_front_shbuf_ops *ops; 39 40 /* Xen map handles for the buffer allocated by the backend */ 41 grant_handle_t *backend_map_handles; 42 }; 43 44 struct xen_drm_front_shbuf_cfg { 45 struct xenbus_device *xb_dev; 46 size_t size; 47 struct page **pages; 48 bool be_alloc; 49 }; 50 51 struct xen_drm_front_shbuf * 52 xen_drm_front_shbuf_alloc(struct xen_drm_front_shbuf_cfg *cfg); 53 54 grant_ref_t xen_drm_front_shbuf_get_dir_start(struct xen_drm_front_shbuf *buf); 55 56 int xen_drm_front_shbuf_map(struct xen_drm_front_shbuf *buf); 57 58 int xen_drm_front_shbuf_unmap(struct xen_drm_front_shbuf *buf); 59 60 void xen_drm_front_shbuf_flush(struct xen_drm_front_shbuf *buf); 61 62 void xen_drm_front_shbuf_free(struct xen_drm_front_shbuf *buf); 63 64 #endif /* __XEN_DRM_FRONT_SHBUF_H_ */ 65
