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[Xen-devel] [PATCH 1/4] usb: Add Xen pvUSB protocol description



Add the definition of pvUSB protocol used between the pvUSB frontend in
a Xen domU and the pvUSB backend in a Xen driver domain (usually Dom0).

This header was originally provided by Fujitsu for Xen based on Linux
2.6.18.

Changes are:
- adapt to Linux style guide

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 include/xen/interface/io/usbif.h | 220 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 220 insertions(+)
 create mode 100644 include/xen/interface/io/usbif.h

diff --git a/include/xen/interface/io/usbif.h b/include/xen/interface/io/usbif.h
new file mode 100644
index 0000000..29815e2
--- /dev/null
+++ b/include/xen/interface/io/usbif.h
@@ -0,0 +1,220 @@
+/*
+ * usbif.h
+ *
+ * USB I/O interface for Xen guest OSes.
+ *
+ * Copyright (C) 2009, FUJITSU LABORATORIES LTD.
+ * Author: Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __XEN_PUBLIC_IO_USBIF_H__
+#define __XEN_PUBLIC_IO_USBIF_H__
+
+#include "ring.h"
+#include "../grant_table.h"
+
+/*
+ * Feature and Parameter Negotiation
+ * =================================
+ * The two halves of a Xen pvUSB driver utilize nodes within the XenStore to
+ * communicate capabilities and to negotiate operating parameters. This
+ * section enumerates these nodes which reside in the respective front and
+ * backend portions of the XenStore, following the XenBus convention.
+ *
+ * Any specified default value is in effect if the corresponding XenBus node
+ * is not present in the XenStore.
+ *
+ * XenStore nodes in sections marked "PRIVATE" are solely for use by the
+ * driver side whose XenBus tree contains them.
+ *
+ *****************************************************************************
+ *                            Backend XenBus Nodes
+ *****************************************************************************
+ *
+ *------------------ Backend Device Identification (PRIVATE) ------------------
+ *
+ * num-ports
+ *      Values:         unsigned [1...31]
+ *
+ *      Number of ports for this (virtual) USB host connector.
+ *
+ * usb-ver
+ *      Values:         unsigned [1...2]
+ *
+ *      USB version of this host connector: 1 = USB 1.1, 2 = USB 2.0.
+ *
+ * port/[1...31]
+ *      Values:         string
+ *
+ *      Physical USB device connected to the given port, e.g. "3-1.5".
+ *
+ *****************************************************************************
+ *                            Frontend XenBus Nodes
+ *****************************************************************************
+ *
+ *----------------------- Request Transport Parameters -----------------------
+ *
+ * event-channel
+ *      Values:         unsigned
+ *
+ *      The identifier of the Xen event channel used to signal activity
+ *      in the ring buffer.
+ *
+ * urb-ring-ref
+ *      Values:         unsigned
+ *
+ *      The Xen grant reference granting permission for the backend to map
+ *      the sole page in a single page sized ring buffer. This is the ring
+ *      buffer for urb requests.
+ *
+ * conn-ring-ref
+ *      Values:         unsigned
+ *
+ *      The Xen grant reference granting permission for the backend to map
+ *      the sole page in a single page sized ring buffer. This is the ring
+ *      buffer for connection/disconnection requests.
+ *
+ * protocol
+ *      Values:         string (XEN_IO_PROTO_ABI_*)
+ *      Default Value:  XEN_IO_PROTO_ABI_NATIVE
+ *
+ *      The machine ABI rules governing the format of all ring request and
+ *      response structures.
+ *
+ */
+
+enum usb_spec_version {
+       USB_VER_UNKNOWN = 0,
+       USB_VER_USB11,
+       USB_VER_USB20,
+       USB_VER_USB30,  /* not supported yet */
+};
+
+/*
+ *  USB pipe in usbif_request
+ *
+ *  bits 0-5 are specific bits for virtual USB driver.
+ *  bits 7-31 are standard urb pipe.
+ *
+ *  - port number(NEW):        bits 0-4
+ *                             (USB_MAXCHILDREN is 31)
+ *
+ *  - operation flag(NEW):     bit 5
+ *                             (0 = submit urb,
+ *                              1 = unlink urb)
+ *
+ *  - direction:               bit 7
+ *                             (0 = Host-to-Device [Out]
+ *                              1 = Device-to-Host [In])
+ *
+ *  - device address:          bits 8-14
+ *
+ *  - endpoint:                        bits 15-18
+ *
+ *  - pipe type:               bits 30-31
+ *                             (00 = isochronous, 01 = interrupt,
+ *                              10 = control, 11 = bulk)
+ */
+#define usbif_pipeportnum(pipe) ((pipe) & 0x1f)
+#define usbif_setportnum_pipe(pipe, portnum) \
+       ((pipe)|(portnum))
+
+#define usbif_pipeunlink(pipe) ((pipe) & 0x20)
+#define usbif_pipesubmit(pipe) (!usbif_pipeunlink(pipe))
+#define usbif_setunlink_pipe(pipe) ((pipe) | 0x20)
+
+#define USBIF_MAX_SEGMENTS_PER_REQUEST 16
+
+/*
+ * RING for transferring urbs.
+ */
+struct usbif_request_segment {
+       grant_ref_t gref;
+       uint16_t offset;
+       uint16_t length;
+};
+
+struct usbif_urb_request {
+       uint16_t id;                    /* request id */
+       uint16_t nr_buffer_segs;        /* # of urb->transfer_buffer segments */
+
+       /* basic urb parameter */
+       uint32_t pipe;
+       uint16_t transfer_flags;
+       uint16_t buffer_length;
+       union {
+               uint8_t ctrl[8];                /* pipe type control */
+                                               /* setup packet */
+
+               struct {
+                       uint16_t interval;      /* max (1024*8) in usb core */
+                       uint16_t start_frame;           /* start frame */
+                       uint16_t number_of_packets;     /* # of ISO packets */
+                       uint16_t nr_frame_desc_segs;
+                                       /* # of iso_frame_desc segments */
+               } isoc;                         /* pipe type isochronous */
+
+               struct {
+                       uint16_t interval;      /* max (1024*8) in usb core */
+                       uint16_t pad[3];
+               } intr;                         /* pipe type interrupt */
+
+               struct {
+                       uint16_t unlink_id;     /* unlink request id */
+                       uint16_t pad[3];
+               } unlink;                       /* pipe unlink */
+
+       } u;
+
+       /* urb data segments */
+       struct usbif_request_segment seg[USBIF_MAX_SEGMENTS_PER_REQUEST];
+};
+
+struct usbif_urb_response {
+       uint16_t id;            /* request id */
+       uint16_t start_frame;   /* start frame (ISO) */
+       int32_t status;         /* status (non-ISO) */
+       int32_t actual_length;  /* actual transfer length */
+       int32_t error_count;    /* number of ISO errors */
+};
+
+DEFINE_RING_TYPES(usbif_urb, struct usbif_urb_request,
+                 struct usbif_urb_response);
+#define USB_URB_RING_SIZE __CONST_RING_SIZE(usbif_urb, PAGE_SIZE)
+
+/*
+ * RING for notifying connect/disconnect events to frontend
+ */
+struct usbif_conn_request {
+       uint16_t id;
+};
+
+struct usbif_conn_response {
+       uint16_t id;            /* request id */
+       uint8_t portnum;        /* port number */
+       uint8_t speed;          /* usb_device_speed */
+};
+
+DEFINE_RING_TYPES(usbif_conn, struct usbif_conn_request,
+                 struct usbif_conn_response);
+#define USB_CONN_RING_SIZE __CONST_RING_SIZE(usbif_conn, PAGE_SIZE)
+
+#endif /* __XEN_PUBLIC_IO_USBIF_H__ */
-- 
2.1.4


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