406 lines
16 KiB
C
406 lines
16 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* usbif.h
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*
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* USB I/O interface for Xen guest OSes.
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*
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* Copyright (C) 2009, FUJITSU LABORATORIES LTD.
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* Author: Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com>
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*/
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#ifndef __XEN_PUBLIC_IO_USBIF_H__
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#define __XEN_PUBLIC_IO_USBIF_H__
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#include "ring.h"
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#include "../grant_table.h"
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/*
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* Detailed Interface Description
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* ==============================
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* The pvUSB interface is using a split driver design: a frontend driver in
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* the guest and a backend driver in a driver domain (normally dom0) having
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* access to the physical USB device(s) being passed to the guest.
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*
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* The frontend and backend drivers use XenStore to initiate the connection
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* between them, the I/O activity is handled via two shared ring pages and an
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* event channel. As the interface between frontend and backend is at the USB
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* host connector level, multiple (up to 31) physical USB devices can be
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* handled by a single connection.
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*
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* The Xen pvUSB device name is "qusb", so the frontend's XenStore entries are
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* to be found under "device/qusb", while the backend's XenStore entries are
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* under "backend/<guest-dom-id>/qusb".
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*
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* When a new pvUSB connection is established, the frontend needs to setup the
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* two shared ring pages for communication and the event channel. The ring
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* pages need to be made available to the backend via the grant table
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* interface.
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*
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* One of the shared ring pages is used by the backend to inform the frontend
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* about USB device plug events (device to be added or removed). This is the
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* "conn-ring".
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*
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* The other ring page is used for USB I/O communication (requests and
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* responses). This is the "urb-ring".
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*
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* Feature and Parameter Negotiation
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* =================================
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* The two halves of a Xen pvUSB driver utilize nodes within the XenStore to
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* communicate capabilities and to negotiate operating parameters. This
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* section enumerates these nodes which reside in the respective front and
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* backend portions of the XenStore, following the XenBus convention.
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*
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* Any specified default value is in effect if the corresponding XenBus node
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* is not present in the XenStore.
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*
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* XenStore nodes in sections marked "PRIVATE" are solely for use by the
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* driver side whose XenBus tree contains them.
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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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*------------------ Backend Device Identification (PRIVATE) ------------------
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*
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* num-ports
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* Values: unsigned [1...31]
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*
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* Number of ports for this (virtual) USB host connector.
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*
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* usb-ver
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* Values: unsigned [1...2]
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*
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* USB version of this host connector: 1 = USB 1.1, 2 = USB 2.0.
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*
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* port/[1...31]
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* Values: string
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*
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* Physical USB device connected to the given port, e.g. "3-1.5".
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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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*----------------------- Request Transport Parameters -----------------------
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*
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* event-channel
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* Values: unsigned
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*
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* The identifier of the Xen event channel used to signal activity
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* in the ring buffer.
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*
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* urb-ring-ref
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* Values: unsigned
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*
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* The Xen grant reference granting permission for the backend to map
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* the sole page in a single page sized ring buffer. This is the ring
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* buffer for urb requests.
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*
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* conn-ring-ref
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* Values: unsigned
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*
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* The Xen grant reference granting permission for the backend to map
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* the sole page in a single page sized ring buffer. This is the ring
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* buffer for connection/disconnection requests.
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*
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* protocol
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* Values: string (XEN_IO_PROTO_ABI_*)
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* Default Value: XEN_IO_PROTO_ABI_NATIVE
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*
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* The machine ABI rules governing the format of all ring request and
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* response structures.
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*
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* Protocol Description
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* ====================
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*
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*-------------------------- USB device plug events --------------------------
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*
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* USB device plug events are send via the "conn-ring" shared page. As only
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* events are being sent, the respective requests from the frontend to the
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* backend are just dummy ones.
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* The events sent to the frontend have the following layout:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | id | portnum | speed | 4
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* +----------------+----------------+----------------+----------------+
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* id - uint16_t, event id (taken from the actual frontend dummy request)
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* portnum - uint8_t, port number (1 ... 31)
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* speed - uint8_t, device XENUSB_SPEED_*, XENUSB_SPEED_NONE == unplug
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*
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* The dummy request:
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* 0 1 octet
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* +----------------+----------------+
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* | id | 2
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* +----------------+----------------+
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* id - uint16_t, guest supplied value (no need for being unique)
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*
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*-------------------------- USB I/O request ---------------------------------
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*
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* A single USB I/O request on the "urb-ring" has the following layout:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | id | nr_buffer_segs | 4
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* +----------------+----------------+----------------+----------------+
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* | pipe | 8
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* +----------------+----------------+----------------+----------------+
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* | transfer_flags | buffer_length | 12
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* +----------------+----------------+----------------+----------------+
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* | request type specific | 16
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* | data | 20
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* +----------------+----------------+----------------+----------------+
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* | seg[0] | 24
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* | data | 28
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* +----------------+----------------+----------------+----------------+
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* |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
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* +----------------+----------------+----------------+----------------+
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* | seg[XENUSB_MAX_SEGMENTS_PER_REQUEST - 1] | 144
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* | data | 148
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* +----------------+----------------+----------------+----------------+
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* Bit field bit number 0 is always least significant bit, undefined bits must
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* be zero.
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* id - uint16_t, guest supplied value
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* nr_buffer_segs - uint16_t, number of segment entries in seg[] array
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* pipe - uint32_t, bit field with multiple information:
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* bits 0-4: port request to send to
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* bit 5: unlink request with specified id (cancel I/O) if set (see below)
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* bit 7: direction (1 = read from device)
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* bits 8-14: device number on port
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* bits 15-18: endpoint of device
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* bits 30-31: request type: 00 = isochronous, 01 = interrupt,
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* 10 = control, 11 = bulk
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* transfer_flags - uint16_t, bit field with processing flags:
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* bit 0: less data than specified allowed
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* buffer_length - uint16_t, total length of data
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* request type specific data - 8 bytes, see below
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* seg[] - array with 8 byte elements, see below
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*
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* Request type specific data for isochronous request:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | interval | start_frame | 4
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* +----------------+----------------+----------------+----------------+
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* | number_of_packets | nr_frame_desc_segs | 8
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* +----------------+----------------+----------------+----------------+
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* interval - uint16_t, time interval in msecs between frames
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* start_frame - uint16_t, start frame number
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* number_of_packets - uint16_t, number of packets to transfer
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* nr_frame_desc_segs - uint16_t number of seg[] frame descriptors elements
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*
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* Request type specific data for interrupt request:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | interval | 0 | 4
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* +----------------+----------------+----------------+----------------+
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* | 0 | 8
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* +----------------+----------------+----------------+----------------+
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* interval - uint16_t, time in msecs until interruption
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*
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* Request type specific data for control request:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | data of setup packet | 4
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* | | 8
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* +----------------+----------------+----------------+----------------+
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*
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* Request type specific data for bulk request:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | 0 | 4
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* | 0 | 8
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* +----------------+----------------+----------------+----------------+
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*
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* Request type specific data for unlink request:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | unlink_id | 0 | 4
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* +----------------+----------------+----------------+----------------+
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* | 0 | 8
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* +----------------+----------------+----------------+----------------+
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* unlink_id - uint16_t, request id of request to terminate
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*
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* seg[] array element layout:
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | gref | 4
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* +----------------+----------------+----------------+----------------+
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* | offset | length | 8
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* +----------------+----------------+----------------+----------------+
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* gref - uint32_t, grant reference of buffer page
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* offset - uint16_t, offset of buffer start in page
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* length - uint16_t, length of buffer in page
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*
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*-------------------------- USB I/O response --------------------------------
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*
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* 0 1 2 3 octet
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* +----------------+----------------+----------------+----------------+
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* | id | start_frame | 4
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* +----------------+----------------+----------------+----------------+
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* | status | 8
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* +----------------+----------------+----------------+----------------+
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* | actual_length | 12
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* +----------------+----------------+----------------+----------------+
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* | error_count | 16
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* +----------------+----------------+----------------+----------------+
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* id - uint16_t, id of the request this response belongs to
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* start_frame - uint16_t, start_frame this response (iso requests only)
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* status - int32_t, XENUSB_STATUS_* (non-iso requests)
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* actual_length - uint32_t, actual size of data transferred
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* error_count - uint32_t, number of errors (iso requests)
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*/
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enum xenusb_spec_version {
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XENUSB_VER_UNKNOWN = 0,
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XENUSB_VER_USB11,
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XENUSB_VER_USB20,
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XENUSB_VER_USB30, /* not supported yet */
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};
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/*
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* USB pipe in xenusb_request
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*
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* - port number: bits 0-4
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* (USB_MAXCHILDREN is 31)
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*
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* - operation flag: bit 5
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* (0 = submit urb,
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* 1 = unlink urb)
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*
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* - direction: bit 7
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* (0 = Host-to-Device [Out]
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* 1 = Device-to-Host [In])
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*
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* - device address: bits 8-14
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*
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* - endpoint: bits 15-18
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*
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* - pipe type: bits 30-31
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* (00 = isochronous, 01 = interrupt,
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* 10 = control, 11 = bulk)
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*/
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#define XENUSB_PIPE_PORT_MASK 0x0000001f
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#define XENUSB_PIPE_UNLINK 0x00000020
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#define XENUSB_PIPE_DIR 0x00000080
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#define XENUSB_PIPE_DEV_MASK 0x0000007f
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#define XENUSB_PIPE_DEV_SHIFT 8
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#define XENUSB_PIPE_EP_MASK 0x0000000f
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#define XENUSB_PIPE_EP_SHIFT 15
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#define XENUSB_PIPE_TYPE_MASK 0x00000003
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#define XENUSB_PIPE_TYPE_SHIFT 30
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#define XENUSB_PIPE_TYPE_ISOC 0
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#define XENUSB_PIPE_TYPE_INT 1
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#define XENUSB_PIPE_TYPE_CTRL 2
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#define XENUSB_PIPE_TYPE_BULK 3
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#define xenusb_pipeportnum(pipe) ((pipe) & XENUSB_PIPE_PORT_MASK)
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#define xenusb_setportnum_pipe(pipe, portnum) ((pipe) | (portnum))
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#define xenusb_pipeunlink(pipe) ((pipe) & XENUSB_PIPE_UNLINK)
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#define xenusb_pipesubmit(pipe) (!xenusb_pipeunlink(pipe))
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#define xenusb_setunlink_pipe(pipe) ((pipe) | XENUSB_PIPE_UNLINK)
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#define xenusb_pipein(pipe) ((pipe) & XENUSB_PIPE_DIR)
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#define xenusb_pipeout(pipe) (!xenusb_pipein(pipe))
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#define xenusb_pipedevice(pipe) \
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(((pipe) >> XENUSB_PIPE_DEV_SHIFT) & XENUSB_PIPE_DEV_MASK)
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#define xenusb_pipeendpoint(pipe) \
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(((pipe) >> XENUSB_PIPE_EP_SHIFT) & XENUSB_PIPE_EP_MASK)
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#define xenusb_pipetype(pipe) \
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(((pipe) >> XENUSB_PIPE_TYPE_SHIFT) & XENUSB_PIPE_TYPE_MASK)
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#define xenusb_pipeisoc(pipe) (xenusb_pipetype(pipe) == XENUSB_PIPE_TYPE_ISOC)
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#define xenusb_pipeint(pipe) (xenusb_pipetype(pipe) == XENUSB_PIPE_TYPE_INT)
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#define xenusb_pipectrl(pipe) (xenusb_pipetype(pipe) == XENUSB_PIPE_TYPE_CTRL)
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#define xenusb_pipebulk(pipe) (xenusb_pipetype(pipe) == XENUSB_PIPE_TYPE_BULK)
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#define XENUSB_MAX_SEGMENTS_PER_REQUEST (16)
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#define XENUSB_MAX_PORTNR 31
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#define XENUSB_RING_SIZE 4096
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/*
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* RING for transferring urbs.
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*/
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struct xenusb_request_segment {
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grant_ref_t gref;
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uint16_t offset;
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uint16_t length;
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};
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struct xenusb_urb_request {
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uint16_t id; /* request id */
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uint16_t nr_buffer_segs; /* number of urb->transfer_buffer segments */
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/* basic urb parameter */
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uint32_t pipe;
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uint16_t transfer_flags;
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#define XENUSB_SHORT_NOT_OK 0x0001
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uint16_t buffer_length;
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union {
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uint8_t ctrl[8]; /* setup_packet (Ctrl) */
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struct {
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uint16_t interval; /* maximum (1024*8) in usb core */
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uint16_t start_frame; /* start frame */
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uint16_t number_of_packets; /* number of ISO packet */
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uint16_t nr_frame_desc_segs; /* number of iso_frame_desc segments */
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} isoc;
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struct {
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uint16_t interval; /* maximum (1024*8) in usb core */
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uint16_t pad[3];
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} intr;
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struct {
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uint16_t unlink_id; /* unlink request id */
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uint16_t pad[3];
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} unlink;
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} u;
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/* urb data segments */
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struct xenusb_request_segment seg[XENUSB_MAX_SEGMENTS_PER_REQUEST];
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};
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struct xenusb_urb_response {
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uint16_t id; /* request id */
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uint16_t start_frame; /* start frame (ISO) */
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int32_t status; /* status (non-ISO) */
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#define XENUSB_STATUS_OK 0
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#define XENUSB_STATUS_NODEV (-19)
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#define XENUSB_STATUS_INVAL (-22)
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#define XENUSB_STATUS_STALL (-32)
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#define XENUSB_STATUS_IOERROR (-71)
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#define XENUSB_STATUS_BABBLE (-75)
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#define XENUSB_STATUS_SHUTDOWN (-108)
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int32_t actual_length; /* actual transfer length */
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int32_t error_count; /* number of ISO errors */
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};
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DEFINE_RING_TYPES(xenusb_urb, struct xenusb_urb_request, struct xenusb_urb_response);
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#define XENUSB_URB_RING_SIZE __CONST_RING_SIZE(xenusb_urb, XENUSB_RING_SIZE)
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/*
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* RING for notifying connect/disconnect events to frontend
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*/
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struct xenusb_conn_request {
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uint16_t id;
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};
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struct xenusb_conn_response {
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uint16_t id; /* request id */
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uint8_t portnum; /* port number */
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uint8_t speed; /* usb_device_speed */
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#define XENUSB_SPEED_NONE 0
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#define XENUSB_SPEED_LOW 1
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#define XENUSB_SPEED_FULL 2
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#define XENUSB_SPEED_HIGH 3
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};
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DEFINE_RING_TYPES(xenusb_conn, struct xenusb_conn_request, struct xenusb_conn_response);
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#define XENUSB_CONN_RING_SIZE __CONST_RING_SIZE(xenusb_conn, XENUSB_RING_SIZE)
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#endif /* __XEN_PUBLIC_IO_USBIF_H__ */
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