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