d6e0fbb82e
Implement shared buffer handling according to the para-virtualized sound device protocol at xen/interface/io/sndif.h: - manage buffer memory - handle granted references - handle page directories [ Fixed missing linux/kernel.h inclusion -- tiwai ] Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
36 lines
844 B
C
36 lines
844 B
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/*
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* Xen para-virtual sound 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_SND_FRONT_SHBUF_H
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#define __XEN_SND_FRONT_SHBUF_H
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#include <xen/grant_table.h>
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#include "xen_snd_front_evtchnl.h"
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struct xen_snd_front_shbuf {
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int num_grefs;
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grant_ref_t *grefs;
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u8 *directory;
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u8 *buffer;
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size_t buffer_sz;
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};
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grant_ref_t xen_snd_front_shbuf_get_dir_start(struct xen_snd_front_shbuf *buf);
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int xen_snd_front_shbuf_alloc(struct xenbus_device *xb_dev,
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struct xen_snd_front_shbuf *buf,
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unsigned int buffer_sz);
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void xen_snd_front_shbuf_clear(struct xen_snd_front_shbuf *buf);
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void xen_snd_front_shbuf_free(struct xen_snd_front_shbuf *buf);
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#endif /* __XEN_SND_FRONT_SHBUF_H */
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