1 /* $NetBSD: xen_drm_front_evtchnl.h,v 1.2 2021/12/18 23:45:45 riastradh Exp $ */ 2 3 /* SPDX-License-Identifier: GPL-2.0 OR MIT */ 4 5 /* 6 * Xen para-virtual DRM device 7 * 8 * Copyright (C) 2016-2018 EPAM Systems Inc. 9 * 10 * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> 11 */ 12 13 #ifndef __XEN_DRM_FRONT_EVTCHNL_H_ 14 #define __XEN_DRM_FRONT_EVTCHNL_H_ 15 16 #include <linux/completion.h> 17 #include <linux/types.h> 18 19 #include <xen/interface/io/ring.h> 20 #include <xen/interface/io/displif.h> 21 22 /* 23 * All operations which are not connector oriented use this ctrl event channel, 24 * e.g. fb_attach/destroy which belong to a DRM device, not to a CRTC. 25 */ 26 #define GENERIC_OP_EVT_CHNL 0 27 28 enum xen_drm_front_evtchnl_state { 29 EVTCHNL_STATE_DISCONNECTED, 30 EVTCHNL_STATE_CONNECTED, 31 }; 32 33 enum xen_drm_front_evtchnl_type { 34 EVTCHNL_TYPE_REQ, 35 EVTCHNL_TYPE_EVT, 36 }; 37 38 struct xen_drm_front_drm_info; 39 40 struct xen_drm_front_evtchnl { 41 struct xen_drm_front_info *front_info; 42 int gref; 43 int port; 44 int irq; 45 int index; 46 enum xen_drm_front_evtchnl_state state; 47 enum xen_drm_front_evtchnl_type type; 48 /* either response id or incoming event id */ 49 u16 evt_id; 50 /* next request id or next expected event id */ 51 u16 evt_next_id; 52 union { 53 struct { 54 struct xen_displif_front_ring ring; 55 struct completion completion; 56 /* latest response status */ 57 int resp_status; 58 /* serializer for backend IO: request/response */ 59 struct mutex req_io_lock; 60 } req; 61 struct { 62 struct xendispl_event_page *page; 63 } evt; 64 } u; 65 }; 66 67 struct xen_drm_front_evtchnl_pair { 68 struct xen_drm_front_evtchnl req; 69 struct xen_drm_front_evtchnl evt; 70 }; 71 72 int xen_drm_front_evtchnl_create_all(struct xen_drm_front_info *front_info); 73 74 int xen_drm_front_evtchnl_publish_all(struct xen_drm_front_info *front_info); 75 76 void xen_drm_front_evtchnl_flush(struct xen_drm_front_evtchnl *evtchnl); 77 78 void xen_drm_front_evtchnl_set_state(struct xen_drm_front_info *front_info, 79 enum xen_drm_front_evtchnl_state state); 80 81 void xen_drm_front_evtchnl_free_all(struct xen_drm_front_info *front_info); 82 83 #endif /* __XEN_DRM_FRONT_EVTCHNL_H_ */ 84