/* 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_EVTCHNL_H_
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#define __XEN_DRM_FRONT_EVTCHNL_H_
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#include <linux/completion.h>
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#include <linux/types.h>
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#include <xen/interface/io/ring.h>
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#include <xen/interface/io/displif.h>
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/*
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* All operations which are not connector oriented use this ctrl event channel,
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* e.g. fb_attach/destroy which belong to a DRM device, not to a CRTC.
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*/
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#define GENERIC_OP_EVT_CHNL 0
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enum xen_drm_front_evtchnl_state {
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EVTCHNL_STATE_DISCONNECTED,
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EVTCHNL_STATE_CONNECTED,
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};
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enum xen_drm_front_evtchnl_type {
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EVTCHNL_TYPE_REQ,
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EVTCHNL_TYPE_EVT,
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};
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struct xen_drm_front_drm_info;
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struct xen_drm_front_evtchnl {
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struct xen_drm_front_info *front_info;
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int gref;
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int port;
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int irq;
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int index;
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enum xen_drm_front_evtchnl_state state;
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enum xen_drm_front_evtchnl_type type;
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/* either response id or incoming event id */
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u16 evt_id;
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/* next request id or next expected event id */
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u16 evt_next_id;
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union {
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struct {
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struct xen_displif_front_ring ring;
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struct completion completion;
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/* latest response status */
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int resp_status;
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/* serializer for backend IO: request/response */
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struct mutex req_io_lock;
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} req;
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struct {
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struct xendispl_event_page *page;
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} evt;
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} u;
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};
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struct xen_drm_front_evtchnl_pair {
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struct xen_drm_front_evtchnl req;
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struct xen_drm_front_evtchnl evt;
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};
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int xen_drm_front_evtchnl_create_all(struct xen_drm_front_info *front_info);
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int xen_drm_front_evtchnl_publish_all(struct xen_drm_front_info *front_info);
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void xen_drm_front_evtchnl_flush(struct xen_drm_front_evtchnl *evtchnl);
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void xen_drm_front_evtchnl_set_state(struct xen_drm_front_info *front_info,
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enum xen_drm_front_evtchnl_state state);
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void xen_drm_front_evtchnl_free_all(struct xen_drm_front_info *front_info);
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#endif /* __XEN_DRM_FRONT_EVTCHNL_H_ */
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