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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
* Xen para-virtual sound device
* Copyright (C) 2016-2018 EPAM Systems Inc.
* Author: Oleksandr Andrushchenko <>
#include <xen/interface/io/sndif.h>
struct xen_snd_front_info;
* FIXME: usage of grant reference 0 as invalid grant reference:
* grant reference 0 is valid, but never exposed to a PV driver,
* because of the fact it is already in use/reserved by the PV console.
/* Timeout in ms to wait for backend to respond. */
#define VSND_WAIT_BACK_MS 3000
enum xen_snd_front_evtchnl_state {
enum xen_snd_front_evtchnl_type {
struct xen_snd_front_evtchnl {
struct xen_snd_front_info *front_info;
int gref;
int port;
int irq;
int index;
/* State of the event channel. */
enum xen_snd_front_evtchnl_state state;
enum xen_snd_front_evtchnl_type type;
/* Either response id or incoming event id. */
u16 evt_id;
/* Next request id or next expected event id. */
u16 evt_next_id;
/* Shared ring access lock. */
struct mutex ring_io_lock;
union {
struct {
struct xen_sndif_front_ring ring;
struct completion completion;
/* Serializer for backend IO: request/response. */
struct mutex req_io_lock;
/* Latest response status. */
int resp_status;
union {
struct xensnd_query_hw_param hw_param;
} resp;
} req;
struct {
struct xensnd_event_page *page;
/* This is needed to handle XENSND_EVT_CUR_POS event. */
struct snd_pcm_substream *substream;
} evt;
} u;
struct xen_snd_front_evtchnl_pair {
struct xen_snd_front_evtchnl req;
struct xen_snd_front_evtchnl evt;
int xen_snd_front_evtchnl_create_all(struct xen_snd_front_info *front_info,
int num_streams);
void xen_snd_front_evtchnl_free_all(struct xen_snd_front_info *front_info);
int xen_snd_front_evtchnl_publish_all(struct xen_snd_front_info *front_info);
void xen_snd_front_evtchnl_flush(struct xen_snd_front_evtchnl *evtchnl);
void xen_snd_front_evtchnl_pair_set_connected(struct xen_snd_front_evtchnl_pair *evt_pair,
bool is_connected);
void xen_snd_front_evtchnl_pair_clear(struct xen_snd_front_evtchnl_pair *evt_pair);
#endif /* __XEN_SND_FRONT_EVTCHNL_H */