/* SPDX-License-Identifier: GPL-2.0 OR MIT */ /* * Xen para-virtual sound device * * Copyright (C) 2016-2018 EPAM Systems Inc. * * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> */ #ifndef __XEN_SND_FRONT_EVTCHNL_H #define __XEN_SND_FRONT_EVTCHNL_H #include <xen/interface/io/sndif.h> struct xen_snd_front_info; #ifndef GRANT_INVALID_REF /* * 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. */ #define GRANT_INVALID_REF 0 #endif /* Timeout in ms to wait for backend to respond. */ #define VSND_WAIT_BACK_MS 3000 enum xen_snd_front_evtchnl_state { EVTCHNL_STATE_DISCONNECTED, EVTCHNL_STATE_CONNECTED, }; enum xen_snd_front_evtchnl_type { EVTCHNL_TYPE_REQ, EVTCHNL_TYPE_EVT, }; 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 */Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Oleksandr Andrushchenko | 217 | 100.00% | 1 | 100.00% |
| Total | 217 | 100.00% | 1 | 100.00% |