82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
|
|
|
|
/*
|
|
* Xen para-virtual DRM device
|
|
*
|
|
* Copyright (C) 2016-2018 EPAM Systems Inc.
|
|
*
|
|
* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
|
|
*/
|
|
|
|
#ifndef __XEN_DRM_FRONT_EVTCHNL_H_
|
|
#define __XEN_DRM_FRONT_EVTCHNL_H_
|
|
|
|
#include <linux/completion.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <xen/interface/io/ring.h>
|
|
#include <xen/interface/io/displif.h>
|
|
|
|
/*
|
|
* All operations which are not connector oriented use this ctrl event channel,
|
|
* e.g. fb_attach/destroy which belong to a DRM device, not to a CRTC.
|
|
*/
|
|
#define GENERIC_OP_EVT_CHNL 0
|
|
|
|
enum xen_drm_front_evtchnl_state {
|
|
EVTCHNL_STATE_DISCONNECTED,
|
|
EVTCHNL_STATE_CONNECTED,
|
|
};
|
|
|
|
enum xen_drm_front_evtchnl_type {
|
|
EVTCHNL_TYPE_REQ,
|
|
EVTCHNL_TYPE_EVT,
|
|
};
|
|
|
|
struct xen_drm_front_drm_info;
|
|
|
|
struct xen_drm_front_evtchnl {
|
|
struct xen_drm_front_info *front_info;
|
|
int gref;
|
|
int port;
|
|
int irq;
|
|
int index;
|
|
enum xen_drm_front_evtchnl_state state;
|
|
enum xen_drm_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;
|
|
union {
|
|
struct {
|
|
struct xen_displif_front_ring ring;
|
|
struct completion completion;
|
|
/* latest response status */
|
|
int resp_status;
|
|
/* serializer for backend IO: request/response */
|
|
struct mutex req_io_lock;
|
|
} req;
|
|
struct {
|
|
struct xendispl_event_page *page;
|
|
} evt;
|
|
} u;
|
|
};
|
|
|
|
struct xen_drm_front_evtchnl_pair {
|
|
struct xen_drm_front_evtchnl req;
|
|
struct xen_drm_front_evtchnl evt;
|
|
};
|
|
|
|
int xen_drm_front_evtchnl_create_all(struct xen_drm_front_info *front_info);
|
|
|
|
int xen_drm_front_evtchnl_publish_all(struct xen_drm_front_info *front_info);
|
|
|
|
void xen_drm_front_evtchnl_flush(struct xen_drm_front_evtchnl *evtchnl);
|
|
|
|
void xen_drm_front_evtchnl_set_state(struct xen_drm_front_info *front_info,
|
|
enum xen_drm_front_evtchnl_state state);
|
|
|
|
void xen_drm_front_evtchnl_free_all(struct xen_drm_front_info *front_info);
|
|
|
|
#endif /* __XEN_DRM_FRONT_EVTCHNL_H_ */
|