863 lines
39 KiB
C
863 lines
39 KiB
C
/******************************************************************************
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* displif.h
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*
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* Unified display device I/O interface for Xen guest OSes.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Copyright (C) 2016-2017 EPAM Systems Inc.
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*
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* Authors: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
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* Oleksandr Grytsov <oleksandr_grytsov@epam.com>
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*/
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#ifndef __XEN_PUBLIC_IO_DISPLIF_H__
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#define __XEN_PUBLIC_IO_DISPLIF_H__
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#include "ring.h"
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#include "../grant_table.h"
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/*
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******************************************************************************
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* Protocol version
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******************************************************************************
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*/
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#define XENDISPL_PROTOCOL_VERSION "1"
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/*
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******************************************************************************
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* Main features provided by the protocol
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******************************************************************************
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* This protocol aims to provide a unified protocol which fits more
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* sophisticated use-cases than a framebuffer device can handle. At the
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* moment basic functionality is supported with the intention to be extended:
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* o multiple dynamically allocated/destroyed framebuffers
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* o buffers of arbitrary sizes
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* o buffer allocation at either back or front end
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* o better configuration options including multiple display support
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*
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* Note: existing fbif can be used together with displif running at the
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* same time, e.g. on Linux one provides framebuffer and another DRM/KMS
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*
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* Note: display resolution (XenStore's "resolution" property) defines
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* visible area of the virtual display. At the same time resolution of
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* the display and frame buffers may differ: buffers can be smaller, equal
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* or bigger than the visible area. This is to enable use-cases, where backend
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* may do some post-processing of the display and frame buffers supplied,
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* e.g. those buffers can be just a part of the final composition.
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*
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******************************************************************************
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* Direction of improvements
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******************************************************************************
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* Future extensions to the existing protocol may include:
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* o display/connector cloning
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* o allocation of objects other than display buffers
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* o plane/overlay support
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* o scaling support
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* o rotation support
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*
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******************************************************************************
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* Feature and Parameter Negotiation
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******************************************************************************
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*
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* Front->back notifications: when enqueuing a new request, sending a
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* notification can be made conditional on xendispl_req (i.e., the generic
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* hold-off mechanism provided by the ring macros). Backends must set
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* xendispl_req appropriately (e.g., using RING_FINAL_CHECK_FOR_REQUESTS()).
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*
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* Back->front notifications: when enqueuing a new response, sending a
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* notification can be made conditional on xendispl_resp (i.e., the generic
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* hold-off mechanism provided by the ring macros). Frontends must set
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* xendispl_resp appropriately (e.g., using RING_FINAL_CHECK_FOR_RESPONSES()).
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*
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* The two halves of a para-virtual display driver utilize nodes within
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* XenStore to communicate capabilities and to negotiate operating parameters.
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* This section enumerates these nodes which reside in the respective front and
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* backend portions of XenStore, following the XenBus convention.
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*
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* All data in XenStore is stored as strings. Nodes specifying numeric
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* values are encoded in decimal. Integer value ranges listed below are
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* expressed as fixed sized integer types capable of storing the conversion
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* of a properly formated node string, without loss of information.
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*
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******************************************************************************
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* Example configuration
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******************************************************************************
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*
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* Note: depending on the use-case backend can expose more display connectors
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* than the underlying HW physically has by employing SW graphics compositors
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*
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* This is an example of backend and frontend configuration:
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*
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*--------------------------------- Backend -----------------------------------
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*
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* /local/domain/0/backend/vdispl/1/0/frontend-id = "1"
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* /local/domain/0/backend/vdispl/1/0/frontend = "/local/domain/1/device/vdispl/0"
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* /local/domain/0/backend/vdispl/1/0/state = "4"
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* /local/domain/0/backend/vdispl/1/0/versions = "1,2"
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*
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*--------------------------------- Frontend ----------------------------------
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*
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* /local/domain/1/device/vdispl/0/backend-id = "0"
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* /local/domain/1/device/vdispl/0/backend = "/local/domain/0/backend/vdispl/1/0"
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* /local/domain/1/device/vdispl/0/state = "4"
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* /local/domain/1/device/vdispl/0/version = "1"
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* /local/domain/1/device/vdispl/0/be-alloc = "1"
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*
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*-------------------------- Connector 0 configuration ------------------------
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*
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* /local/domain/1/device/vdispl/0/0/resolution = "1920x1080"
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* /local/domain/1/device/vdispl/0/0/req-ring-ref = "2832"
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* /local/domain/1/device/vdispl/0/0/req-event-channel = "15"
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* /local/domain/1/device/vdispl/0/0/evt-ring-ref = "387"
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* /local/domain/1/device/vdispl/0/0/evt-event-channel = "16"
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*
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*-------------------------- Connector 1 configuration ------------------------
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*
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* /local/domain/1/device/vdispl/0/1/resolution = "800x600"
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* /local/domain/1/device/vdispl/0/1/req-ring-ref = "2833"
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* /local/domain/1/device/vdispl/0/1/req-event-channel = "17"
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* /local/domain/1/device/vdispl/0/1/evt-ring-ref = "388"
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* /local/domain/1/device/vdispl/0/1/evt-event-channel = "18"
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*
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******************************************************************************
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* Backend XenBus Nodes
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******************************************************************************
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*
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*----------------------------- Protocol version ------------------------------
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*
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* versions
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* Values: <string>
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*
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* List of XENDISPL_LIST_SEPARATOR separated protocol versions supported
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* by the backend. For example "1,2,3".
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*
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******************************************************************************
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* Frontend XenBus Nodes
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******************************************************************************
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*
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*-------------------------------- Addressing ---------------------------------
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*
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* dom-id
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* Values: <uint16_t>
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*
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* Domain identifier.
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*
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* dev-id
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* Values: <uint16_t>
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*
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* Device identifier.
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*
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* conn-idx
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* Values: <uint8_t>
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*
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* Zero based contigous index of the connector.
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* /local/domain/<dom-id>/device/vdispl/<dev-id>/<conn-idx>/...
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*
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*----------------------------- Protocol version ------------------------------
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*
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* version
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* Values: <string>
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*
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* Protocol version, chosen among the ones supported by the backend.
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*
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*------------------------- Backend buffer allocation -------------------------
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*
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* be-alloc
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* Values: "0", "1"
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*
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* If value is set to "1", then backend can be a buffer provider/allocator
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* for this domain during XENDISPL_OP_DBUF_CREATE operation (see below
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* for negotiation).
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* If value is not "1" or omitted frontend must allocate buffers itself.
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*
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*----------------------------- Connector settings ----------------------------
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*
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* unique-id
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* Values: <string>
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*
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* After device instance initialization each connector is assigned a
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* unique ID, so it can be identified by the backend by this ID.
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* This can be UUID or such.
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*
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* resolution
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* Values: <width, uint32_t>x<height, uint32_t>
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*
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* Width and height of the connector in pixels separated by
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* XENDISPL_RESOLUTION_SEPARATOR. This defines visible area of the
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* display.
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*
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*------------------ Connector Request Transport Parameters -------------------
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*
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* This communication path is used to deliver requests from frontend to backend
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* and get the corresponding responses from backend to frontend,
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* set up per connector.
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*
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* req-event-channel
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* Values: <uint32_t>
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*
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* The identifier of the Xen connector's control event channel
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* used to signal activity in the ring buffer.
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*
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* req-ring-ref
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* Values: <uint32_t>
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*
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* The Xen grant reference granting permission for the backend to map
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* a sole page of connector's control ring buffer.
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*
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*------------------- Connector Event Transport Parameters --------------------
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*
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* This communication path is used to deliver asynchronous events from backend
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* to frontend, set up per connector.
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*
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* evt-event-channel
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* Values: <uint32_t>
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*
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* The identifier of the Xen connector's event channel
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* used to signal activity in the ring buffer.
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*
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* evt-ring-ref
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* Values: <uint32_t>
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*
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* The Xen grant reference granting permission for the backend to map
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* a sole page of connector's event ring buffer.
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*/
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/*
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******************************************************************************
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* STATE DIAGRAMS
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******************************************************************************
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*
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* Tool stack creates front and back state nodes with initial state
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* XenbusStateInitialising.
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* Tool stack creates and sets up frontend display configuration
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* nodes per domain.
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*
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*-------------------------------- Normal flow --------------------------------
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*
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* Front Back
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* ================================= =====================================
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* XenbusStateInitialising XenbusStateInitialising
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* o Query backend device identification
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* data.
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* o Open and validate backend device.
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* |
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* |
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* V
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* XenbusStateInitWait
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*
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* o Query frontend configuration
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* o Allocate and initialize
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* event channels per configured
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* connector.
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* o Publish transport parameters
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* that will be in effect during
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* this connection.
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* |
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* |
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* V
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* XenbusStateInitialised
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*
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* o Query frontend transport parameters.
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* o Connect to the event channels.
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* |
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* |
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* V
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* XenbusStateConnected
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*
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* o Create and initialize OS
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* virtual display connectors
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* as per configuration.
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* |
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* |
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* V
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* XenbusStateConnected
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*
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* XenbusStateUnknown
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* XenbusStateClosed
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* XenbusStateClosing
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* o Remove virtual display device
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* o Remove event channels
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* |
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* |
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* V
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* XenbusStateClosed
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*
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*------------------------------- Recovery flow -------------------------------
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*
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* In case of frontend unrecoverable errors backend handles that as
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* if frontend goes into the XenbusStateClosed state.
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*
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* In case of backend unrecoverable errors frontend tries removing
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* the virtualized device. If this is possible at the moment of error,
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* then frontend goes into the XenbusStateInitialising state and is ready for
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* new connection with backend. If the virtualized device is still in use and
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* cannot be removed, then frontend goes into the XenbusStateReconfiguring state
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* until either the virtualized device is removed or backend initiates a new
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* connection. On the virtualized device removal frontend goes into the
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* XenbusStateInitialising state.
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*
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* Note on XenbusStateReconfiguring state of the frontend: if backend has
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* unrecoverable errors then frontend cannot send requests to the backend
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* and thus cannot provide functionality of the virtualized device anymore.
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* After backend is back to normal the virtualized device may still hold some
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* state: configuration in use, allocated buffers, client application state etc.
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* In most cases, this will require frontend to implement complex recovery
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* reconnect logic. Instead, by going into XenbusStateReconfiguring state,
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* frontend will make sure no new clients of the virtualized device are
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* accepted, allow existing client(s) to exit gracefully by signaling error
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* state etc.
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* Once all the clients are gone frontend can reinitialize the virtualized
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* device and get into XenbusStateInitialising state again signaling the
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* backend that a new connection can be made.
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*
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* There are multiple conditions possible under which frontend will go from
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* XenbusStateReconfiguring into XenbusStateInitialising, some of them are OS
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* specific. For example:
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* 1. The underlying OS framework may provide callbacks to signal that the last
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* client of the virtualized device has gone and the device can be removed
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* 2. Frontend can schedule a deferred work (timer/tasklet/workqueue)
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* to periodically check if this is the right time to re-try removal of
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* the virtualized device.
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* 3. By any other means.
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*
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******************************************************************************
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* REQUEST CODES
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******************************************************************************
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* Request codes [0; 15] are reserved and must not be used
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*/
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#define XENDISPL_OP_DBUF_CREATE 0x10
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#define XENDISPL_OP_DBUF_DESTROY 0x11
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#define XENDISPL_OP_FB_ATTACH 0x12
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#define XENDISPL_OP_FB_DETACH 0x13
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#define XENDISPL_OP_SET_CONFIG 0x14
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#define XENDISPL_OP_PG_FLIP 0x15
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/*
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******************************************************************************
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* EVENT CODES
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******************************************************************************
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*/
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#define XENDISPL_EVT_PG_FLIP 0x00
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/*
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******************************************************************************
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* XENSTORE FIELD AND PATH NAME STRINGS, HELPERS
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******************************************************************************
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*/
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#define XENDISPL_DRIVER_NAME "vdispl"
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#define XENDISPL_LIST_SEPARATOR ","
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#define XENDISPL_RESOLUTION_SEPARATOR "x"
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#define XENDISPL_FIELD_BE_VERSIONS "versions"
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#define XENDISPL_FIELD_FE_VERSION "version"
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#define XENDISPL_FIELD_REQ_RING_REF "req-ring-ref"
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#define XENDISPL_FIELD_REQ_CHANNEL "req-event-channel"
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#define XENDISPL_FIELD_EVT_RING_REF "evt-ring-ref"
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#define XENDISPL_FIELD_EVT_CHANNEL "evt-event-channel"
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#define XENDISPL_FIELD_RESOLUTION "resolution"
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#define XENDISPL_FIELD_BE_ALLOC "be-alloc"
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#define XENDISPL_FIELD_UNIQUE_ID "unique-id"
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/*
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******************************************************************************
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* STATUS RETURN CODES
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******************************************************************************
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*
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* Status return code is zero on success and -XEN_EXX on failure.
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*
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******************************************************************************
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* Assumptions
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******************************************************************************
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* o 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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* o all references in this document to page sizes must be treated
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* as pages of size XEN_PAGE_SIZE unless otherwise noted.
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*
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******************************************************************************
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* Description of the protocol between frontend and backend driver
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******************************************************************************
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*
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* The two halves of a Para-virtual display driver communicate with
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* each other using shared pages and event channels.
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* Shared page contains a ring with request/response packets.
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*
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* All reserved fields in the structures below must be 0.
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* Display buffers's cookie of value 0 is treated as invalid.
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* Framebuffer's cookie of value 0 is treated as invalid.
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*
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* For all request/response/event packets that use cookies:
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* dbuf_cookie - uint64_t, unique to guest domain value used by the backend
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* to map remote display buffer to its local one
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* fb_cookie - uint64_t, unique to guest domain value used by the backend
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* to map remote framebuffer to its local one
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*
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*---------------------------------- Requests ---------------------------------
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*
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* All requests/responses, which are not connector specific, must be sent over
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* control ring of the connector which has the index value of 0:
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* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
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*
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* All request packets have the same length (64 octets)
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* All request packets have common header:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | id | operation | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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* id - uint16_t, private guest value, echoed in response
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* operation - uint8_t, operation code, XENDISPL_OP_???
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*
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* Request dbuf creation - request creation of a display buffer.
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | id |_OP_DBUF_CREATE | reserved | 4
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* +----------------+----------------+----------------+----------------+
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* | reserved | 8
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* +----------------+----------------+----------------+----------------+
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* | dbuf_cookie low 32-bit | 12
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* +----------------+----------------+----------------+----------------+
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* | dbuf_cookie high 32-bit | 16
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* +----------------+----------------+----------------+----------------+
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* | width | 20
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* +----------------+----------------+----------------+----------------+
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* | height | 24
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* +----------------+----------------+----------------+----------------+
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* | bpp | 28
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* +----------------+----------------+----------------+----------------+
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* | buffer_sz | 32
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* +----------------+----------------+----------------+----------------+
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* | flags | 36
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* +----------------+----------------+----------------+----------------+
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* | gref_directory | 40
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* +----------------+----------------+----------------+----------------+
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* | reserved | 44
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | reserved | 64
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* +----------------+----------------+----------------+----------------+
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*
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* Must be sent over control ring of the connector which has the index
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* value of 0:
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* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
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* All unused bits in flags field must be set to 0.
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*
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* An attempt to create multiple display buffers with the same dbuf_cookie is
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* an error. dbuf_cookie can be re-used after destroying the corresponding
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* display buffer.
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*
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* Width and height of the display buffers can be smaller, equal or bigger
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* than the connector's resolution. Depth/pixel format of the individual
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* buffers can differ as well.
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*
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* width - uint32_t, width in pixels
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* height - uint32_t, height in pixels
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* bpp - uint32_t, bits per pixel
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* buffer_sz - uint32_t, buffer size to be allocated, octets
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* flags - uint32_t, flags of the operation
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* o XENDISPL_DBUF_FLG_REQ_ALLOC - if set, then backend is requested
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* to allocate the buffer with the parameters provided in this request.
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* Page directory is handled as follows:
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* Frontend on request:
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* o allocates pages for the directory (gref_directory,
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* gref_dir_next_page(s)
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* o grants permissions for the pages of the directory to the backend
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* o sets gref_dir_next_page fields
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* Backend on response:
|
|
* o grants permissions for the pages of the buffer allocated to
|
|
* the frontend
|
|
* o fills in page directory with grant references
|
|
* (gref[] in struct xendispl_page_directory)
|
|
* gref_directory - grant_ref_t, a reference to the first shared page
|
|
* describing shared buffer references. At least one page exists. If shared
|
|
* buffer size (buffer_sz) exceeds what can be addressed by this single page,
|
|
* then reference to the next page must be supplied (see gref_dir_next_page
|
|
* below)
|
|
*/
|
|
|
|
#define XENDISPL_DBUF_FLG_REQ_ALLOC (1 << 0)
|
|
|
|
struct xendispl_dbuf_create_req {
|
|
uint64_t dbuf_cookie;
|
|
uint32_t width;
|
|
uint32_t height;
|
|
uint32_t bpp;
|
|
uint32_t buffer_sz;
|
|
uint32_t flags;
|
|
grant_ref_t gref_directory;
|
|
};
|
|
|
|
/*
|
|
* Shared page for XENDISPL_OP_DBUF_CREATE buffer descriptor (gref_directory in
|
|
* the request) employs a list of pages, describing all pages of the shared
|
|
* data buffer:
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | gref_dir_next_page | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | gref[0] | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | gref[i] | i*4+8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | gref[N - 1] | N*4+8
|
|
* +----------------+----------------+----------------+----------------+
|
|
*
|
|
* gref_dir_next_page - grant_ref_t, reference to the next page describing
|
|
* page directory. Must be 0 if there are no more pages in the list.
|
|
* gref[i] - grant_ref_t, reference to a shared page of the buffer
|
|
* allocated at XENDISPL_OP_DBUF_CREATE
|
|
*
|
|
* Number of grant_ref_t entries in the whole page directory is not
|
|
* passed, but instead can be calculated as:
|
|
* num_grefs_total = (XENDISPL_OP_DBUF_CREATE.buffer_sz + XEN_PAGE_SIZE - 1) /
|
|
* XEN_PAGE_SIZE
|
|
*/
|
|
|
|
struct xendispl_page_directory {
|
|
grant_ref_t gref_dir_next_page;
|
|
grant_ref_t gref[1]; /* Variable length */
|
|
};
|
|
|
|
/*
|
|
* Request dbuf destruction - destroy a previously allocated display buffer:
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | id |_OP_DBUF_DESTROY| reserved | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | dbuf_cookie low 32-bit | 12
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | dbuf_cookie high 32-bit | 16
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 20
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 64
|
|
* +----------------+----------------+----------------+----------------+
|
|
*
|
|
* Must be sent over control ring of the connector which has the index
|
|
* value of 0:
|
|
* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
|
|
*/
|
|
|
|
struct xendispl_dbuf_destroy_req {
|
|
uint64_t dbuf_cookie;
|
|
};
|
|
|
|
/*
|
|
* Request framebuffer attachment - request attachment of a framebuffer to
|
|
* previously created display buffer.
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | id | _OP_FB_ATTACH | reserved | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | dbuf_cookie low 32-bit | 12
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | dbuf_cookie high 32-bit | 16
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie low 32-bit | 20
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie high 32-bit | 24
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | width | 28
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | height | 32
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | pixel_format | 36
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 40
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 64
|
|
* +----------------+----------------+----------------+----------------+
|
|
*
|
|
* Must be sent over control ring of the connector which has the index
|
|
* value of 0:
|
|
* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
|
|
* Width and height can be smaller, equal or bigger than the connector's
|
|
* resolution.
|
|
*
|
|
* An attempt to create multiple frame buffers with the same fb_cookie is
|
|
* an error. fb_cookie can be re-used after destroying the corresponding
|
|
* frame buffer.
|
|
*
|
|
* width - uint32_t, width in pixels
|
|
* height - uint32_t, height in pixels
|
|
* pixel_format - uint32_t, pixel format of the framebuffer, FOURCC code
|
|
*/
|
|
|
|
struct xendispl_fb_attach_req {
|
|
uint64_t dbuf_cookie;
|
|
uint64_t fb_cookie;
|
|
uint32_t width;
|
|
uint32_t height;
|
|
uint32_t pixel_format;
|
|
};
|
|
|
|
/*
|
|
* Request framebuffer detach - detach a previously
|
|
* attached framebuffer from the display buffer in request:
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | id | _OP_FB_DETACH | reserved | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie low 32-bit | 12
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie high 32-bit | 16
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 20
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 64
|
|
* +----------------+----------------+----------------+----------------+
|
|
*
|
|
* Must be sent over control ring of the connector which has the index
|
|
* value of 0:
|
|
* /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
|
|
*/
|
|
|
|
struct xendispl_fb_detach_req {
|
|
uint64_t fb_cookie;
|
|
};
|
|
|
|
/*
|
|
* Request configuration set/reset - request to set or reset
|
|
* the configuration/mode of the display:
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | id | _OP_SET_CONFIG | reserved | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie low 32-bit | 12
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie high 32-bit | 16
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | x | 20
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | y | 24
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | width | 28
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | height | 32
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | bpp | 40
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 44
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 64
|
|
* +----------------+----------------+----------------+----------------+
|
|
*
|
|
* Pass all zeros to reset, otherwise command is treated as
|
|
* configuration set.
|
|
* Framebuffer's cookie defines which framebuffer/dbuf must be
|
|
* displayed while enabling display (applying configuration).
|
|
* x, y, width and height are bound by the connector's resolution and must not
|
|
* exceed it.
|
|
*
|
|
* x - uint32_t, starting position in pixels by X axis
|
|
* y - uint32_t, starting position in pixels by Y axis
|
|
* width - uint32_t, width in pixels
|
|
* height - uint32_t, height in pixels
|
|
* bpp - uint32_t, bits per pixel
|
|
*/
|
|
|
|
struct xendispl_set_config_req {
|
|
uint64_t fb_cookie;
|
|
uint32_t x;
|
|
uint32_t y;
|
|
uint32_t width;
|
|
uint32_t height;
|
|
uint32_t bpp;
|
|
};
|
|
|
|
/*
|
|
* Request page flip - request to flip a page identified by the framebuffer
|
|
* cookie:
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | id | _OP_PG_FLIP | reserved | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie low 32-bit | 12
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie high 32-bit | 16
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 20
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 64
|
|
* +----------------+----------------+----------------+----------------+
|
|
*/
|
|
|
|
struct xendispl_page_flip_req {
|
|
uint64_t fb_cookie;
|
|
};
|
|
|
|
/*
|
|
*---------------------------------- Responses --------------------------------
|
|
*
|
|
* All response packets have the same length (64 octets)
|
|
*
|
|
* All response packets have common header:
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | id | reserved | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | status | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 12
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 64
|
|
* +----------------+----------------+----------------+----------------+
|
|
*
|
|
* id - uint16_t, private guest value, echoed from request
|
|
* status - int32_t, response status, zero on success and -XEN_EXX on failure
|
|
*
|
|
*----------------------------------- Events ----------------------------------
|
|
*
|
|
* Events are sent via a shared page allocated by the front and propagated by
|
|
* evt-event-channel/evt-ring-ref XenStore entries
|
|
* All event packets have the same length (64 octets)
|
|
* All event packets have common header:
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | id | type | reserved | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
*
|
|
* id - uint16_t, event id, may be used by front
|
|
* type - uint8_t, type of the event
|
|
*
|
|
*
|
|
* Page flip complete event - event from back to front on page flip completed:
|
|
* 0 1 2 3 octet
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | id | _EVT_PG_FLIP | reserved | 4
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 8
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie low 32-bit | 12
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | fb_cookie high 32-bit | 16
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 20
|
|
* +----------------+----------------+----------------+----------------+
|
|
* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|
|
* +----------------+----------------+----------------+----------------+
|
|
* | reserved | 64
|
|
* +----------------+----------------+----------------+----------------+
|
|
*/
|
|
|
|
struct xendispl_pg_flip_evt {
|
|
uint64_t fb_cookie;
|
|
};
|
|
|
|
struct xendispl_req {
|
|
uint16_t id;
|
|
uint8_t operation;
|
|
uint8_t reserved[5];
|
|
union {
|
|
struct xendispl_dbuf_create_req dbuf_create;
|
|
struct xendispl_dbuf_destroy_req dbuf_destroy;
|
|
struct xendispl_fb_attach_req fb_attach;
|
|
struct xendispl_fb_detach_req fb_detach;
|
|
struct xendispl_set_config_req set_config;
|
|
struct xendispl_page_flip_req pg_flip;
|
|
uint8_t reserved[56];
|
|
} op;
|
|
};
|
|
|
|
struct xendispl_resp {
|
|
uint16_t id;
|
|
uint8_t operation;
|
|
uint8_t reserved;
|
|
int32_t status;
|
|
uint8_t reserved1[56];
|
|
};
|
|
|
|
struct xendispl_evt {
|
|
uint16_t id;
|
|
uint8_t type;
|
|
uint8_t reserved[5];
|
|
union {
|
|
struct xendispl_pg_flip_evt pg_flip;
|
|
uint8_t reserved[56];
|
|
} op;
|
|
};
|
|
|
|
DEFINE_RING_TYPES(xen_displif, struct xendispl_req, struct xendispl_resp);
|
|
|
|
/*
|
|
******************************************************************************
|
|
* Back to front events delivery
|
|
******************************************************************************
|
|
* In order to deliver asynchronous events from back to front a shared page is
|
|
* allocated by front and its granted reference propagated to back via
|
|
* XenStore entries (evt-ring-ref/evt-event-channel).
|
|
* This page has a common header used by both front and back to synchronize
|
|
* access and control event's ring buffer, while back being a producer of the
|
|
* events and front being a consumer. The rest of the page after the header
|
|
* is used for event packets.
|
|
*
|
|
* Upon reception of an event(s) front may confirm its reception
|
|
* for either each event, group of events or none.
|
|
*/
|
|
|
|
struct xendispl_event_page {
|
|
uint32_t in_cons;
|
|
uint32_t in_prod;
|
|
uint8_t reserved[56];
|
|
};
|
|
|
|
#define XENDISPL_EVENT_PAGE_SIZE XEN_PAGE_SIZE
|
|
#define XENDISPL_IN_RING_OFFS (sizeof(struct xendispl_event_page))
|
|
#define XENDISPL_IN_RING_SIZE (XENDISPL_EVENT_PAGE_SIZE - XENDISPL_IN_RING_OFFS)
|
|
#define XENDISPL_IN_RING_LEN (XENDISPL_IN_RING_SIZE / sizeof(struct xendispl_evt))
|
|
#define XENDISPL_IN_RING(page) \
|
|
((struct xendispl_evt *)((char *)(page) + XENDISPL_IN_RING_OFFS))
|
|
#define XENDISPL_IN_RING_REF(page, idx) \
|
|
(XENDISPL_IN_RING((page))[(idx) % XENDISPL_IN_RING_LEN])
|
|
|
|
#endif /* __XEN_PUBLIC_IO_DISPLIF_H__ */
|