159 lines
4.4 KiB
C
159 lines
4.4 KiB
C
/* 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_H_
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#define __XEN_DRM_FRONT_H_
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#include <drm/drmP.h>
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#include <drm/drm_simple_kms_helper.h>
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#include <linux/scatterlist.h>
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#include "xen_drm_front_cfg.h"
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/**
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* DOC: Driver modes of operation in terms of display buffers used
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*
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* Depending on the requirements for the para-virtualized environment, namely
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* requirements dictated by the accompanying DRM/(v)GPU drivers running in both
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* host and guest environments, display buffers can be allocated by either
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* frontend driver or backend.
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*/
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/**
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* DOC: Buffers allocated by the frontend driver
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*
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* In this mode of operation driver allocates buffers from system memory.
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*
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* Note! If used with accompanying DRM/(v)GPU drivers this mode of operation
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* may require IOMMU support on the platform, so accompanying DRM/vGPU
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* hardware can still reach display buffer memory while importing PRIME
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* buffers from the frontend driver.
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*/
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/**
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* DOC: Buffers allocated by the backend
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*
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* This mode of operation is run-time configured via guest domain configuration
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* through XenStore entries.
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*
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* For systems which do not provide IOMMU support, but having specific
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* requirements for display buffers it is possible to allocate such buffers
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* at backend side and share those with the frontend.
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* For example, if host domain is 1:1 mapped and has DRM/GPU hardware expecting
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* physically contiguous memory, this allows implementing zero-copying
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* use-cases.
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*
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* Note, while using this scenario the following should be considered:
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*
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* #. If guest domain dies then pages/grants received from the backend
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* cannot be claimed back
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*
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* #. Misbehaving guest may send too many requests to the
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* backend exhausting its grant references and memory
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* (consider this from security POV)
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*/
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/**
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* DOC: Driver limitations
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*
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* #. Only primary plane without additional properties is supported.
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*
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* #. Only one video mode per connector supported which is configured
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* via XenStore.
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*
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* #. All CRTCs operate at fixed frequency of 60Hz.
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*/
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/* timeout in ms to wait for backend to respond */
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#define XEN_DRM_FRONT_WAIT_BACK_MS 3000
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#ifndef GRANT_INVALID_REF
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/*
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* Note on usage of grant reference 0 as invalid grant reference:
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* grant reference 0 is valid, but never exposed to a PV driver,
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* because of the fact it is already in use/reserved by the PV console.
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*/
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#define GRANT_INVALID_REF 0
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#endif
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struct xen_drm_front_info {
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struct xenbus_device *xb_dev;
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struct xen_drm_front_drm_info *drm_info;
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/* to protect data between backend IO code and interrupt handler */
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spinlock_t io_lock;
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int num_evt_pairs;
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struct xen_drm_front_evtchnl_pair *evt_pairs;
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struct xen_drm_front_cfg cfg;
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/* display buffers */
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struct list_head dbuf_list;
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};
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struct xen_drm_front_drm_pipeline {
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struct xen_drm_front_drm_info *drm_info;
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int index;
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struct drm_simple_display_pipe pipe;
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struct drm_connector conn;
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/* These are only for connector mode checking */
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int width, height;
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struct drm_pending_vblank_event *pending_event;
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struct delayed_work pflip_to_worker;
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bool conn_connected;
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};
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struct xen_drm_front_drm_info {
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struct xen_drm_front_info *front_info;
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struct drm_device *drm_dev;
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struct xen_drm_front_drm_pipeline pipeline[XEN_DRM_FRONT_MAX_CRTCS];
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};
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static inline u64 xen_drm_front_fb_to_cookie(struct drm_framebuffer *fb)
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{
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return (uintptr_t)fb;
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}
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static inline u64 xen_drm_front_dbuf_to_cookie(struct drm_gem_object *gem_obj)
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{
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return (uintptr_t)gem_obj;
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}
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int xen_drm_front_mode_set(struct xen_drm_front_drm_pipeline *pipeline,
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u32 x, u32 y, u32 width, u32 height,
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u32 bpp, u64 fb_cookie);
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int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
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u64 dbuf_cookie, u32 width, u32 height,
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u32 bpp, u64 size, struct page **pages);
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int xen_drm_front_fb_attach(struct xen_drm_front_info *front_info,
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u64 dbuf_cookie, u64 fb_cookie, u32 width,
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u32 height, u32 pixel_format);
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int xen_drm_front_fb_detach(struct xen_drm_front_info *front_info,
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u64 fb_cookie);
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int xen_drm_front_page_flip(struct xen_drm_front_info *front_info,
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int conn_idx, u64 fb_cookie);
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void xen_drm_front_on_frame_done(struct xen_drm_front_info *front_info,
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int conn_idx, u64 fb_cookie);
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#endif /* __XEN_DRM_FRONT_H_ */
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