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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v5 3/3] xen: add pvUSB backend
Add a backend for para-virtualized USB devices for xen domains.
The backend is using host-libusb to forward USB requests from a
domain via libusb to the real device(s) passed through.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
V3: multiple small changes as requested by Anthony Perard
check for full ring in case of hotplug events as requested by
Anthony Perard
use RING_COPY_REQUEST() instead of RING_GET_REQUEST()
add check for required header version and disable backend in
case header is too old
V2: use xen_be_printf() instead of fprintf() for diagnostic prints as
requested by Stefano Stabellini
lots of small changes requested by Konrad Wilk
removed isoc request support, will be in separate patch
---
hw/usb/Makefile.objs | 4 +
hw/usb/xen-usb.c | 1080 ++++++++++++++++++++++++++++++++++++++++++
hw/xenpv/xen_machine_pv.c | 3 +
include/hw/xen/xen_backend.h | 3 +
include/hw/xen/xen_common.h | 2 +
5 files changed, 1092 insertions(+)
create mode 100644 hw/usb/xen-usb.c
diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
index 2717027..98b5c9d 100644
--- a/hw/usb/Makefile.objs
+++ b/hw/usb/Makefile.objs
@@ -38,3 +38,7 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
# usb pass-through
common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
+
+ifeq ($(CONFIG_USB_LIBUSB),y)
+common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
+endif
diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c
new file mode 100644
index 0000000..664df04
--- /dev/null
+++ b/hw/usb/xen-usb.c
@@ -0,0 +1,1080 @@
+/*
+ * xen paravirt usb device backend
+ *
+ * (c) Juergen Gross <jgross@xxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include <libusb.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qemu/config-file.h"
+#include "hw/sysbus.h"
+#include "hw/usb.h"
+#include "hw/xen/xen_backend.h"
+#include "monitor/qdev.h"
+#include "qapi/qmp/qbool.h"
+#include "qapi/qmp/qint.h"
+#include "qapi/qmp/qstring.h"
+#include "sys/user.h"
+
+#include <xen/io/ring.h>
+#include <xen/io/usbif.h>
+
+/*
+ * Check for required support of usbif.h: USBIF_SHORT_NOT_OK was the last
+ * macro added we rely on.
+ */
+#ifdef USBIF_SHORT_NOT_OK
+
+#define TR(xendev, lvl, fmt, args...) \
+ { \
+ struct timeval tv; \
+ \
+ gettimeofday(&tv, NULL); \
+ xen_be_printf(xendev, lvl, "%8ld.%06ld xen-usb(%s):" fmt, \
+ tv.tv_sec, tv.tv_usec, __func__, ##args); \
+ }
+#define TR_BUS(xendev, fmt, args...) TR(xendev, 2, fmt, ##args)
+#define TR_REQ(xendev, fmt, args...) TR(xendev, 3, fmt, ##args)
+
+#define USBBACK_MAXPORTS USBIF_PIPE_PORT_MASK
+#define USB_DEV_ADDR_SIZE (USBIF_PIPE_DEV_MASK + 1)
+
+/* USB wire protocol: structure describing control request parameter. */
+struct usbif_ctrlrequest {
+ uint8_t bRequestType;
+ uint8_t bRequest;
+ uint16_t wValue;
+ uint16_t wIndex;
+ uint16_t wLength;
+};
+
+struct usbback_info;
+struct usbback_req;
+
+struct usbback_stub {
+ USBDevice *dev;
+ USBPort port;
+ unsigned int speed;
+ bool attached;
+ QTAILQ_HEAD(submit_q_head, usbback_req) submit_q;
+};
+
+struct usbback_req {
+ struct usbback_info *usbif;
+ struct usbback_stub *stub;
+ struct usbif_urb_request req;
+ USBPacket packet;
+
+ unsigned int nr_buffer_segs; /* # of transfer_buffer segments
*/
+ unsigned int nr_extra_segs; /* # of iso_frame_desc segments
*/
+
+ QTAILQ_ENTRY(usbback_req) q;
+
+ void *buffer;
+ void *isoc_buffer;
+ struct libusb_transfer *xfer;
+};
+
+struct usbback_hotplug {
+ QSIMPLEQ_ENTRY(usbback_hotplug) q;
+ unsigned port;
+};
+
+struct usbback_info {
+ struct XenDevice xendev; /* must be first */
+ USBBus bus;
+ void *urb_sring;
+ void *conn_sring;
+ struct usbif_urb_back_ring urb_ring;
+ struct usbif_conn_back_ring conn_ring;
+ int num_ports;
+ int usb_ver;
+ bool ring_error;
+ QTAILQ_HEAD(req_free_q_head, usbback_req) req_free_q;
+ QSIMPLEQ_HEAD(hotplug_q_head, usbback_hotplug) hotplug_q;
+ struct usbback_stub ports[USBBACK_MAXPORTS];
+ struct usbback_stub *addr_table[USB_DEV_ADDR_SIZE];
+ QEMUBH *bh;
+};
+
+static struct usbback_req *usbback_get_req(struct usbback_info *usbif)
+{
+ struct usbback_req *usbback_req;
+
+ if (QTAILQ_EMPTY(&usbif->req_free_q)) {
+ usbback_req = g_new0(struct usbback_req, 1);
+ } else {
+ usbback_req = QTAILQ_FIRST(&usbif->req_free_q);
+ QTAILQ_REMOVE(&usbif->req_free_q, usbback_req, q);
+ }
+ return usbback_req;
+}
+
+static void usbback_put_req(struct usbback_req *usbback_req)
+{
+ struct usbback_info *usbif;
+
+ usbif = usbback_req->usbif;
+ memset(usbback_req, 0, sizeof(*usbback_req));
+ QTAILQ_INSERT_HEAD(&usbif->req_free_q, usbback_req, q);
+}
+
+static int usbback_gnttab_map(struct usbback_req *usbback_req)
+{
+ unsigned int nr_segs, i, prot;
+ uint32_t ref[USBIF_MAX_SEGMENTS_PER_REQUEST];
+ struct usbback_info *usbif = usbback_req->usbif;
+ struct XenDevice *xendev = &usbif->xendev;
+ struct usbif_request_segment *seg;
+ void *addr;
+
+ nr_segs = usbback_req->nr_buffer_segs + usbback_req->nr_extra_segs;
+ if (!nr_segs) {
+ return 0;
+ }
+
+ if (nr_segs > USBIF_MAX_SEGMENTS_PER_REQUEST) {
+ xen_be_printf(xendev, 0, "bad number of segments in request (%d)\n",
+ nr_segs);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < nr_segs; i++) {
+ if ((unsigned)usbback_req->req.seg[i].offset +
+ (unsigned)usbback_req->req.seg[i].length > PAGE_SIZE) {
+ xen_be_printf(xendev, 0, "segment crosses page boundary\n");
+ return -EINVAL;
+ }
+ }
+
+ if (usbback_req->nr_buffer_segs) {
+ prot = PROT_READ;
+ if (usbif_pipein(usbback_req->req.pipe)) {
+ prot |= PROT_WRITE;
+ }
+ for (i = 0; i < usbback_req->nr_buffer_segs; i++) {
+ ref[i] = usbback_req->req.seg[i].gref;
+ }
+ usbback_req->buffer =
xengnttab_map_domain_grant_refs(xendev->gnttabdev,
+ usbback_req->nr_buffer_segs, xendev->dom, ref, prot);
+
+ if (!usbback_req->buffer) {
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < usbback_req->nr_buffer_segs; i++) {
+ seg = usbback_req->req.seg + i;
+ addr = usbback_req->buffer + i * PAGE_SIZE + seg->offset;
+ qemu_iovec_add(&usbback_req->packet.iov, addr, seg->length);
+ }
+ }
+
+ if (!usbif_pipeisoc(usbback_req->req.pipe)) {
+ return 0;
+ }
+
+ /*
+ * Right now isoc requests are not supported.
+ * Prepare supporting those by doing the work needed on the guest
+ * interface side.
+ */
+
+ if (!usbback_req->nr_extra_segs) {
+ xen_be_printf(xendev, 0, "iso request without descriptor segments\n");
+ return -EINVAL;
+ }
+
+ prot = PROT_READ | PROT_WRITE;
+ for (i = 0; i < usbback_req->nr_extra_segs; i++) {
+ ref[i] = usbback_req->req.seg[i +
usbback_req->req.nr_buffer_segs].gref;
+ }
+ usbback_req->isoc_buffer = xengnttab_map_domain_grant_refs(
+ xendev->gnttabdev, usbback_req->nr_extra_segs, xendev->dom, ref,
prot);
+
+ if (!usbback_req->isoc_buffer) {
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int usbback_init_packet(struct usbback_req *usbback_req)
+{
+ struct XenDevice *xendev = &usbback_req->usbif->xendev;
+ USBPacket *packet = &usbback_req->packet;
+ USBDevice *dev = usbback_req->stub->dev;
+ USBEndpoint *ep;
+ unsigned int pid, ep_nr;
+ bool sok;
+ int ret = 0;
+
+ qemu_iovec_init(&packet->iov, USBIF_MAX_SEGMENTS_PER_REQUEST);
+ pid = usbif_pipein(usbback_req->req.pipe) ? USB_TOKEN_IN : USB_TOKEN_OUT;
+ ep_nr = usbif_pipeendpoint(usbback_req->req.pipe);
+ sok = !!(usbback_req->req.transfer_flags & USBIF_SHORT_NOT_OK);
+ if (usbif_pipectrl(usbback_req->req.pipe)) {
+ ep_nr = 0;
+ sok = false;
+ }
+ ep = usb_ep_get(dev, pid, ep_nr);
+ usb_packet_setup(packet, pid, ep, 0, 1, sok, true);
+
+ switch (usbif_pipetype(usbback_req->req.pipe)) {
+ case USBIF_PIPE_TYPE_ISOC:
+ TR_REQ(xendev, "iso transfer %s: buflen: %x, %d frames\n",
+ (pid == USB_TOKEN_IN) ? "in" : "out",
+ usbback_req->req.buffer_length,
+ usbback_req->req.u.isoc.nr_frame_desc_segs);
+ ret = -EINVAL; /* isoc not implemented yet */
+ break;
+
+ case USBIF_PIPE_TYPE_INT:
+ TR_REQ(xendev, "int transfer %s: buflen: %x\n",
+ (pid == USB_TOKEN_IN) ? "in" : "out",
+ usbback_req->req.buffer_length);
+ break;
+
+ case USBIF_PIPE_TYPE_CTRL:
+ packet->parameter = *(uint64_t *)usbback_req->req.u.ctrl;
+ TR_REQ(xendev, "ctrl parameter: %lx, buflen: %x\n", packet->parameter,
+ usbback_req->req.buffer_length);
+ break;
+
+ case USBIF_PIPE_TYPE_BULK:
+ TR_REQ(xendev, "bulk transfer %s: buflen: %x\n",
+ (pid == USB_TOKEN_IN) ? "in" : "out",
+ usbback_req->req.buffer_length);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static void usbback_do_response(struct usbback_req *usbback_req, int32_t
status,
+ int32_t actual_length, int32_t error_count)
+{
+ struct usbback_info *usbif;
+ struct usbif_urb_response *res;
+ struct XenDevice *xendev;
+ unsigned int notify;
+
+ usbif = usbback_req->usbif;
+ xendev = &usbif->xendev;
+
+ TR_REQ(xendev, "id %d, status %d, length %d, errcnt %d\n",
+ usbback_req->req.id, status, actual_length, error_count);
+
+ if (usbback_req->packet.iov.iov) {
+ qemu_iovec_destroy(&usbback_req->packet.iov);
+ }
+
+ if (usbback_req->buffer) {
+ xengnttab_unmap(xendev->gnttabdev, usbback_req->buffer,
+ usbback_req->nr_buffer_segs);
+ usbback_req->buffer = NULL;
+ }
+
+ if (usbback_req->isoc_buffer) {
+ xengnttab_unmap(xendev->gnttabdev, usbback_req->isoc_buffer,
+ usbback_req->nr_extra_segs);
+ usbback_req->isoc_buffer = NULL;
+ }
+
+ res = RING_GET_RESPONSE(&usbif->urb_ring, usbif->urb_ring.rsp_prod_pvt);
+ res->id = usbback_req->req.id;
+ res->status = status;
+ res->actual_length = actual_length;
+ res->error_count = error_count;
+ res->start_frame = 0;
+ usbif->urb_ring.rsp_prod_pvt++;
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&usbif->urb_ring, notify);
+
+ if (notify) {
+ xen_be_send_notify(xendev);
+ }
+
+ usbback_put_req(usbback_req);
+}
+
+static void usbback_do_response_ret(struct usbback_req *usbback_req,
+ int32_t status)
+{
+ usbback_do_response(usbback_req, status, 0, 0);
+}
+
+static int32_t usbback_xlat_status(int status)
+{
+ switch (status) {
+ case USB_RET_SUCCESS:
+ return 0;
+ case USB_RET_NODEV:
+ return -ENODEV;
+ case USB_RET_STALL:
+ return -EPIPE;
+ case USB_RET_BABBLE:
+ return -EOVERFLOW;
+ case USB_RET_IOERROR:
+ return -EPROTO;
+ }
+
+ return -ESHUTDOWN;
+}
+
+static void usbback_packet_complete(USBPacket *packet)
+{
+ struct usbback_req *usbback_req;
+ int32_t status;
+
+ usbback_req = container_of(packet, struct usbback_req, packet);
+
+ QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q);
+
+ status = usbback_xlat_status(packet->status);
+ usbback_do_response(usbback_req, status, packet->actual_length, 0);
+}
+
+static void usbback_set_address(struct usbback_info *usbif,
+ struct usbback_stub *stub,
+ unsigned int cur_addr, unsigned int new_addr)
+{
+ if (cur_addr) {
+ usbif->addr_table[cur_addr] = NULL;
+ }
+ if (new_addr) {
+ usbif->addr_table[new_addr] = stub;
+ }
+}
+
+static bool usbback_cancel_req(struct usbback_req *usbback_req)
+{
+ bool ret = false;
+
+ if (usb_packet_is_inflight(&usbback_req->packet)) {
+ usb_cancel_packet(&usbback_req->packet);
+ ret = true;
+ }
+ return ret;
+}
+
+static void usbback_process_unlink_req(struct usbback_req *usbback_req)
+{
+ struct usbback_info *usbif;
+ struct usbback_req *unlink_req;
+ unsigned int id, devnum;
+ int ret;
+
+ usbif = usbback_req->usbif;
+ ret = 0;
+ id = usbback_req->req.u.unlink.unlink_id;
+ TR_REQ(&usbif->xendev, "unlink id %d\n", id);
+ devnum = usbif_pipedevice(usbback_req->req.pipe);
+ if (unlikely(devnum == 0)) {
+ usbback_req->stub = usbif->ports +
+ usbif_pipeportnum(usbback_req->req.pipe);
+ if (unlikely(!usbback_req->stub)) {
+ ret = -ENODEV;
+ goto fail_response;
+ }
+ } else {
+ if (unlikely(!usbif->addr_table[devnum])) {
+ ret = -ENODEV;
+ goto fail_response;
+ }
+ usbback_req->stub = usbif->addr_table[devnum];
+ }
+
+ QTAILQ_FOREACH(unlink_req, &usbback_req->stub->submit_q, q) {
+ if (unlink_req->req.id == id) {
+ if (usbback_cancel_req(unlink_req)) {
+ usbback_do_response_ret(unlink_req, -EPROTO);
+ }
+ break;
+ }
+ }
+
+fail_response:
+ usbback_do_response_ret(usbback_req, ret);
+}
+
+/*
+ * Checks whether a request can be handled at once or should be forwarded
+ * to the usb framework.
+ * Return value is:
+ * 0 in case of usb framework is needed
+ * 1 in case of local handling (no error)
+ * The request response has been queued already if return value not 0.
+ */
+static int usbback_check_and_submit(struct usbback_req *usbback_req)
+{
+ struct usbback_info *usbif;
+ unsigned int devnum;
+ struct usbback_stub *stub;
+ struct usbif_ctrlrequest *ctrl;
+ int ret;
+ uint16_t wValue;
+
+ usbif = usbback_req->usbif;
+ stub = NULL;
+ devnum = usbif_pipedevice(usbback_req->req.pipe);
+ ctrl = (struct usbif_ctrlrequest *)usbback_req->req.u.ctrl;
+ wValue = le16_to_cpu(ctrl->wValue);
+
+ /*
+ * When the device is first connected or resetted, USB device has no
+ * address. In this initial state, following requests are sent to device
+ * address (#0),
+ *
+ * 1. GET_DESCRIPTOR (with Descriptor Type is "DEVICE") is sent,
+ * and OS knows what device is connected to.
+ *
+ * 2. SET_ADDRESS is sent, and then device has its address.
+ *
+ * In the next step, SET_CONFIGURATION is sent to addressed device, and
+ * then the device is finally ready to use.
+ */
+ if (unlikely(devnum == 0)) {
+ stub = usbif->ports + usbif_pipeportnum(usbback_req->req.pipe) - 1;
+ if (!stub->dev || !stub->attached) {
+ ret = -ENODEV;
+ goto do_response;
+ }
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_GET_DESCRIPTOR:
+ /*
+ * GET_DESCRIPTOR request to device #0.
+ * through normal transfer.
+ */
+ TR_REQ(&usbif->xendev, "devnum 0 GET_DESCRIPTOR\n");
+ usbback_req->stub = stub;
+ return 0;
+ case USB_REQ_SET_ADDRESS:
+ /*
+ * SET_ADDRESS request to device #0.
+ * add attached device to addr_table.
+ */
+ TR_REQ(&usbif->xendev, "devnum 0 SET_ADDRESS\n");
+ usbback_set_address(usbif, stub, 0, wValue);
+ ret = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ goto do_response;
+ }
+
+ if (unlikely(!usbif->addr_table[devnum])) {
+ ret = -ENODEV;
+ goto do_response;
+ }
+ usbback_req->stub = usbif->addr_table[devnum];
+
+ /*
+ * Check special request
+ */
+ if (ctrl->bRequest != USB_REQ_SET_ADDRESS) {
+ return 0;
+ }
+
+ /*
+ * SET_ADDRESS request to addressed device.
+ * change addr or remove from addr_table.
+ */
+ usbback_set_address(usbif, usbback_req->stub, devnum, wValue);
+ ret = 0;
+
+do_response:
+ usbback_do_response_ret(usbback_req, ret);
+ return 1;
+}
+
+static void usbback_dispatch(struct usbback_req *usbback_req)
+{
+ int ret;
+ unsigned int devnum;
+ struct usbback_info *usbif;
+
+ usbif = usbback_req->usbif;
+
+ TR_REQ(&usbif->xendev, "start req_id %d pipe %08x\n", usbback_req->req.id,
+ usbback_req->req.pipe);
+
+ /* unlink request */
+ if (unlikely(usbif_pipeunlink(usbback_req->req.pipe))) {
+ usbback_process_unlink_req(usbback_req);
+ return;
+ }
+
+ if (usbif_pipectrl(usbback_req->req.pipe)) {
+ if (usbback_check_and_submit(usbback_req)) {
+ return;
+ }
+ } else {
+ devnum = usbif_pipedevice(usbback_req->req.pipe);
+ usbback_req->stub = usbif->addr_table[devnum];
+
+ if (!usbback_req->stub || !usbback_req->stub->attached) {
+ ret = -ENODEV;
+ goto fail_response;
+ }
+ }
+
+ QTAILQ_INSERT_TAIL(&usbback_req->stub->submit_q, usbback_req, q);
+
+ usbback_req->nr_buffer_segs = usbback_req->req.nr_buffer_segs;
+ usbback_req->nr_extra_segs = usbif_pipeisoc(usbback_req->req.pipe) ?
+ usbback_req->req.u.isoc.nr_frame_desc_segs :
0;
+
+ ret = usbback_init_packet(usbback_req);
+ if (ret) {
+ xen_be_printf(&usbif->xendev, 0, "invalid request\n");
+ ret = -ESHUTDOWN;
+ goto fail_free_urb;
+ }
+
+ ret = usbback_gnttab_map(usbback_req);
+ if (ret) {
+ xen_be_printf(&usbif->xendev, 0, "invalid buffer, ret=%d\n", ret);
+ ret = -ESHUTDOWN;
+ goto fail_free_urb;
+ }
+
+ usb_handle_packet(usbback_req->stub->dev, &usbback_req->packet);
+ if (usbback_req->packet.status != USB_RET_ASYNC) {
+ usbback_packet_complete(&usbback_req->packet);
+ }
+ return;
+
+fail_free_urb:
+ QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q);
+
+fail_response:
+ usbback_do_response_ret(usbback_req, ret);
+}
+
+static void usbback_hotplug_notify(struct usbback_info *usbif)
+{
+ struct usbif_conn_back_ring *ring = &usbif->conn_ring;
+ struct usbif_conn_request req;
+ struct usbif_conn_response *res;
+ struct usbback_hotplug *usb_hp;
+ unsigned int notify;
+
+ if (!usbif->conn_sring) {
+ return;
+ }
+
+ /* Check for full ring. */
+ if ((RING_SIZE(ring) - ring->rsp_prod_pvt - ring->req_cons) == 0) {
+ xen_be_send_notify(&usbif->xendev);
+ return;
+ }
+
+ usb_hp = QSIMPLEQ_FIRST(&usbif->hotplug_q);
+ QSIMPLEQ_REMOVE_HEAD(&usbif->hotplug_q, q);
+
+ RING_COPY_REQUEST(ring, ring->req_cons, &req);
+ ring->req_cons++;
+ ring->sring->req_event = ring->req_cons + 1;
+
+ res = RING_GET_RESPONSE(ring, ring->rsp_prod_pvt);
+ res->id = req.id;
+ res->portnum = usb_hp->port;
+ res->speed = usbif->ports[usb_hp->port - 1].speed;
+ ring->rsp_prod_pvt++;
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(ring, notify);
+
+ if (notify) {
+ xen_be_send_notify(&usbif->xendev);
+ }
+
+ TR_BUS(&usbif->xendev, "hotplug port %d speed %d\n", usb_hp->port,
+ res->speed);
+
+ g_free(usb_hp);
+
+ if (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) {
+ qemu_bh_schedule(usbif->bh);
+ }
+}
+
+static void usbback_bh(void *opaque)
+{
+ struct usbback_info *usbif;
+ struct usbif_urb_back_ring *urb_ring;
+ struct usbback_req *usbback_req;
+ RING_IDX rc, rp;
+ unsigned int more_to_do;
+
+ usbif = opaque;
+ if (usbif->ring_error) {
+ return;
+ }
+
+ if (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) {
+ usbback_hotplug_notify(usbif);
+ }
+
+ urb_ring = &usbif->urb_ring;
+ rc = urb_ring->req_cons;
+ rp = urb_ring->sring->req_prod;
+ xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
+
+ if (RING_REQUEST_PROD_OVERFLOW(urb_ring, rp)) {
+ rc = urb_ring->rsp_prod_pvt;
+ xen_be_printf(&usbif->xendev, 0, "domU provided bogus ring requests "
+ "(%#x - %#x = %u). Halting ring processing.\n",
+ rp, rc, rp - rc);
+ usbif->ring_error = true;
+ return;
+ }
+
+ while (rc != rp) {
+ if (RING_REQUEST_CONS_OVERFLOW(urb_ring, rc)) {
+ break;
+ }
+ usbback_req = usbback_get_req(usbif);
+
+ RING_COPY_REQUEST(urb_ring, rc, &usbback_req->req);
+ usbback_req->usbif = usbif;
+
+ usbback_dispatch(usbback_req);
+
+ urb_ring->req_cons = ++rc;
+ }
+
+ RING_FINAL_CHECK_FOR_REQUESTS(urb_ring, more_to_do);
+ if (more_to_do) {
+ qemu_bh_schedule(usbif->bh);
+ }
+}
+
+static void usbback_hotplug_enq(struct usbback_info *usbif, unsigned port)
+{
+ struct usbback_hotplug *usb_hp;
+
+ usb_hp = g_new0(struct usbback_hotplug, 1);
+ usb_hp->port = port;
+ QSIMPLEQ_INSERT_TAIL(&usbif->hotplug_q, usb_hp, q);
+ usbback_hotplug_notify(usbif);
+}
+
+static void usbback_portid_remove(struct usbback_info *usbif, unsigned port)
+{
+ USBPort *p;
+
+ if (!usbif->ports[port - 1].dev) {
+ return;
+ }
+
+ p = &(usbif->ports[port - 1].port);
+ snprintf(p->path, sizeof(p->path), "%d", 99);
+
+ object_unparent(OBJECT(usbif->ports[port - 1].dev));
+ usbif->ports[port - 1].dev = NULL;
+ usbif->ports[port - 1].speed = USBIF_SPEED_NONE;
+ usbif->ports[port - 1].attached = false;
+ usbback_hotplug_enq(usbif, port);
+
+ TR_BUS(&usbif->xendev, "port %d removed\n", port);
+}
+
+static void usbback_portid_add(struct usbback_info *usbif, unsigned port,
+ char *busid)
+{
+ unsigned speed;
+ char *portname;
+ USBPort *p;
+ Error *local_err = NULL;
+ QDict *qdict;
+ QemuOpts *opts;
+
+ if (usbif->ports[port - 1].dev) {
+ return;
+ }
+
+ portname = strchr(busid, '-');
+ if (!portname) {
+ xen_be_printf(&usbif->xendev, 0, "device %s illegal specification\n",
+ busid);
+ return;
+ }
+ portname++;
+ p = &(usbif->ports[port - 1].port);
+ snprintf(p->path, sizeof(p->path), "%s", portname);
+
+ qdict = qdict_new();
+ qdict_put(qdict, "driver", qstring_from_str("usb-host"));
+ qdict_put(qdict, "hostbus", qint_from_int(atoi(busid)));
+ qdict_put(qdict, "hostport", qstring_from_str(portname));
+ opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
+ if (local_err) {
+ goto err;
+ }
+ usbif->ports[port - 1].dev = USB_DEVICE(qdev_device_add(opts, &local_err));
+ if (!usbif->ports[port - 1].dev) {
+ goto err;
+ }
+ QDECREF(qdict);
+ snprintf(p->path, sizeof(p->path), "%d", port);
+ speed = usbif->ports[port - 1].dev->speed;
+ switch (speed) {
+ case USB_SPEED_LOW:
+ speed = USBIF_SPEED_LOW;
+ break;
+ case USB_SPEED_FULL:
+ speed = USBIF_SPEED_FULL;
+ break;
+ case USB_SPEED_HIGH:
+ speed = (usbif->usb_ver < USB_VER_USB20) ?
+ USBIF_SPEED_NONE : USBIF_SPEED_HIGH;
+ break;
+ default:
+ speed = USBIF_SPEED_NONE;
+ break;
+ }
+ if (speed == USBIF_SPEED_NONE) {
+ xen_be_printf(&usbif->xendev, 0, "device %s wrong speed\n", busid);
+ object_unparent(OBJECT(usbif->ports[port - 1].dev));
+ usbif->ports[port - 1].dev = NULL;
+ return;
+ }
+ usb_device_reset(usbif->ports[port - 1].dev);
+ usbif->ports[port - 1].speed = speed;
+ usbif->ports[port - 1].attached = true;
+ QTAILQ_INIT(&usbif->ports[port - 1].submit_q);
+ usbback_hotplug_enq(usbif, port);
+
+ TR_BUS(&usbif->xendev, "port %d attached\n", port);
+ return;
+
+err:
+ QDECREF(qdict);
+ snprintf(p->path, sizeof(p->path), "%d", 99);
+ xen_be_printf(&usbif->xendev, 0, "device %s could not be opened\n", busid);
+}
+
+static void usbback_process_port(struct usbback_info *usbif, unsigned port)
+{
+ char node[8];
+ char *busid;
+
+ snprintf(node, sizeof(node), "port/%d", port);
+ busid = xenstore_read_be_str(&usbif->xendev, node);
+ if (busid == NULL) {
+ xen_be_printf(&usbif->xendev, 0, "xenstore_read %s failed\n", node);
+ return;
+ }
+
+ /* Remove portid, if the port is not connected. */
+ if (strlen(busid) == 0) {
+ usbback_portid_remove(usbif, port);
+ } else {
+ usbback_portid_add(usbif, port, busid);
+ }
+
+ g_free(busid);
+}
+
+static void usbback_disconnect(struct XenDevice *xendev)
+{
+ struct usbback_info *usbif;
+ struct usbback_req *req, *tmp;
+ unsigned int i;
+
+ TR_BUS(xendev, "start\n");
+
+ usbif = container_of(xendev, struct usbback_info, xendev);
+
+ xen_be_unbind_evtchn(xendev);
+
+ if (usbif->urb_sring) {
+ xengnttab_unmap(xendev->gnttabdev, usbif->urb_sring, 1);
+ usbif->urb_sring = NULL;
+ }
+ if (usbif->conn_sring) {
+ xengnttab_unmap(xendev->gnttabdev, usbif->conn_sring, 1);
+ usbif->conn_sring = NULL;
+ }
+
+ for (i = 0; i < usbif->num_ports; i++) {
+ if (!usbif->ports[i].dev) {
+ continue;
+ }
+ QTAILQ_FOREACH_SAFE(req, &usbif->ports[i].submit_q, q, tmp) {
+ usbback_cancel_req(req);
+ }
+ }
+
+ TR_BUS(xendev, "finished\n");
+}
+
+static int usbback_connect(struct XenDevice *xendev)
+{
+ struct usbback_info *usbif;
+ struct usbif_urb_sring *urb_sring;
+ struct usbif_conn_sring *conn_sring;
+ int urb_ring_ref;
+ int conn_ring_ref;
+ unsigned int i;
+
+ TR_BUS(xendev, "start\n");
+
+ usbif = container_of(xendev, struct usbback_info, xendev);
+
+ if (xenstore_read_fe_int(xendev, "urb-ring-ref", &urb_ring_ref)) {
+ xen_be_printf(xendev, 0, "error reading urb-ring-ref\n");
+ return -1;
+ }
+ if (xenstore_read_fe_int(xendev, "conn-ring-ref", &conn_ring_ref)) {
+ xen_be_printf(xendev, 0, "error reading conn-ring-ref\n");
+ return -1;
+ }
+ if (xenstore_read_fe_int(xendev, "event-channel", &xendev->remote_port)) {
+ xen_be_printf(xendev, 0, "error reading event-channel\n");
+ return -1;
+ }
+
+ usbif->urb_sring = xengnttab_map_grant_ref(xendev->gnttabdev, xendev->dom,
+ urb_ring_ref,
+ PROT_READ | PROT_WRITE);
+ usbif->conn_sring = xengnttab_map_grant_ref(xendev->gnttabdev, xendev->dom,
+ conn_ring_ref,
+ PROT_READ | PROT_WRITE);
+ if (!usbif->urb_sring || !usbif->conn_sring) {
+ xen_be_printf(xendev, 0, "error mapping rings\n");
+ usbback_disconnect(xendev);
+ return -1;
+ }
+
+ urb_sring = usbif->urb_sring;
+ conn_sring = usbif->conn_sring;
+ BACK_RING_INIT(&usbif->urb_ring, urb_sring, XC_PAGE_SIZE);
+ BACK_RING_INIT(&usbif->conn_ring, conn_sring, XC_PAGE_SIZE);
+
+ xen_be_bind_evtchn(xendev);
+
+ xen_be_printf(xendev, 1, "urb-ring-ref %d, conn-ring-ref %d, "
+ "remote port %d, local port %d\n", urb_ring_ref,
+ conn_ring_ref, xendev->remote_port, xendev->local_port);
+
+ for (i = 1; i <= usbif->num_ports; i++) {
+ if (usbif->ports[i - 1].dev) {
+ usbback_hotplug_enq(usbif, i);
+ }
+ }
+
+ return 0;
+}
+
+static void usbback_backend_changed(struct XenDevice *xendev, const char *node)
+{
+ struct usbback_info *usbif;
+ unsigned int i;
+
+ TR_BUS(xendev, "path %s\n", node);
+
+ usbif = container_of(xendev, struct usbback_info, xendev);
+ for (i = 1; i <= usbif->num_ports; i++) {
+ usbback_process_port(usbif, i);
+ }
+}
+
+static int usbback_init(struct XenDevice *xendev)
+{
+ struct usbback_info *usbif;
+
+ TR_BUS(xendev, "start\n");
+
+ usbif = container_of(xendev, struct usbback_info, xendev);
+
+ if (xenstore_read_be_int(xendev, "num-ports", &usbif->num_ports) ||
+ usbif->num_ports < 1 || usbif->num_ports > USBBACK_MAXPORTS) {
+ xen_be_printf(xendev, 0, "num-ports not readable or out of bounds\n");
+ return -1;
+ }
+ if (xenstore_read_be_int(xendev, "usb-ver", &usbif->usb_ver) ||
+ (usbif->usb_ver != USB_VER_USB11 && usbif->usb_ver != USB_VER_USB20)) {
+ xen_be_printf(xendev, 0, "usb-ver not readable or out of bounds\n");
+ return -1;
+ }
+
+ usbback_backend_changed(xendev, "port");
+
+ TR_BUS(xendev, "finished\n");
+
+ return 0;
+}
+
+static void xen_bus_attach(USBPort *port)
+{
+ struct usbback_info *usbif;
+
+ usbif = port->opaque;
+ TR_BUS(&usbif->xendev, "\n");
+ usbif->ports[port->index].attached = true;
+ usbback_hotplug_enq(usbif, port->index + 1);
+}
+
+static void xen_bus_detach(USBPort *port)
+{
+ struct usbback_info *usbif;
+
+ usbif = port->opaque;
+ TR_BUS(&usbif->xendev, "\n");
+ usbif->ports[port->index].attached = false;
+ usbback_hotplug_enq(usbif, port->index + 1);
+}
+
+static void xen_bus_child_detach(USBPort *port, USBDevice *child)
+{
+ struct usbback_info *usbif;
+
+ usbif = port->opaque;
+ TR_BUS(&usbif->xendev, "\n");
+}
+
+static void xen_bus_complete(USBPort *port, USBPacket *packet)
+{
+ struct usbback_info *usbif;
+
+ usbif = port->opaque;
+ TR_REQ(&usbif->xendev, "\n");
+ usbback_packet_complete(packet);
+}
+
+static USBPortOps xen_usb_port_ops = {
+ .attach = xen_bus_attach,
+ .detach = xen_bus_detach,
+ .child_detach = xen_bus_child_detach,
+ .complete = xen_bus_complete,
+};
+
+static USBBusOps xen_usb_bus_ops = {
+};
+
+static void usbback_alloc(struct XenDevice *xendev)
+{
+ struct usbback_info *usbif;
+ USBPort *p;
+ unsigned int i, max_grants;
+
+ usbif = container_of(xendev, struct usbback_info, xendev);
+
+ usb_bus_new(&usbif->bus, sizeof(usbif->bus), &xen_usb_bus_ops, xen_sysdev);
+ for (i = 0; i < USBBACK_MAXPORTS; i++) {
+ p = &(usbif->ports[i].port);
+ usb_register_port(&usbif->bus, p, usbif, i, &xen_usb_port_ops,
+ USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL |
+ USB_SPEED_MASK_HIGH);
+ snprintf(p->path, sizeof(p->path), "%d", 99);
+ }
+
+ QTAILQ_INIT(&usbif->req_free_q);
+ QSIMPLEQ_INIT(&usbif->hotplug_q);
+ usbif->bh = qemu_bh_new(usbback_bh, usbif);
+
+ /* max_grants: for each request and for the rings (request and connect). */
+ max_grants = USBIF_MAX_SEGMENTS_PER_REQUEST * USB_URB_RING_SIZE + 2;
+ if (xengnttab_set_max_grants(xendev->gnttabdev, max_grants) < 0) {
+ xen_be_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
+ strerror(errno));
+ }
+}
+
+static int usbback_free(struct XenDevice *xendev)
+{
+ struct usbback_info *usbif;
+ struct usbback_req *usbback_req;
+ struct usbback_hotplug *usb_hp;
+ unsigned int i;
+
+ TR_BUS(xendev, "start\n");
+
+ usbback_disconnect(xendev);
+ usbif = container_of(xendev, struct usbback_info, xendev);
+ for (i = 1; i <= usbif->num_ports; i++) {
+ usbback_portid_remove(usbif, i);
+ }
+
+ while (!QTAILQ_EMPTY(&usbif->req_free_q)) {
+ usbback_req = QTAILQ_FIRST(&usbif->req_free_q);
+ QTAILQ_REMOVE(&usbif->req_free_q, usbback_req, q);
+ g_free(usbback_req);
+ }
+ while (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) {
+ usb_hp = QSIMPLEQ_FIRST(&usbif->hotplug_q);
+ QSIMPLEQ_REMOVE_HEAD(&usbif->hotplug_q, q);
+ g_free(usb_hp);
+ }
+
+ qemu_bh_delete(usbif->bh);
+
+ for (i = 0; i < USBBACK_MAXPORTS; i++) {
+ usb_unregister_port(&usbif->bus, &(usbif->ports[i].port));
+ }
+
+ usb_bus_release(&usbif->bus);
+
+ TR_BUS(xendev, "finished\n");
+
+ return 0;
+}
+
+static void usbback_event(struct XenDevice *xendev)
+{
+ struct usbback_info *usbif;
+
+ usbif = container_of(xendev, struct usbback_info, xendev);
+ qemu_bh_schedule(usbif->bh);
+}
+
+struct XenDevOps xen_usb_ops = {
+ .size = sizeof(struct usbback_info),
+ .flags = DEVOPS_FLAG_NEED_GNTDEV,
+ .init = usbback_init,
+ .alloc = usbback_alloc,
+ .free = usbback_free,
+ .backend_changed = usbback_backend_changed,
+ .initialise = usbback_connect,
+ .disconnect = usbback_disconnect,
+ .event = usbback_event,
+};
+
+#else /* USBIF_SHORT_NOT_OK */
+
+static int usbback_not_supported(void)
+{
+ return -EINVAL;
+}
+
+struct XenDevOps xen_usb_ops = {
+ .backend_register = usbback_not_supported,
+};
+
+#endif
diff --git a/hw/xenpv/xen_machine_pv.c b/hw/xenpv/xen_machine_pv.c
index 48d5bc6..f68cf48 100644
--- a/hw/xenpv/xen_machine_pv.c
+++ b/hw/xenpv/xen_machine_pv.c
@@ -80,6 +80,9 @@ static void xen_init_pv(MachineState *machine)
xen_be_register("vfb", &xen_framebuffer_ops);
xen_be_register("qdisk", &xen_blkdev_ops);
xen_be_register("qnic", &xen_netdev_ops);
+#ifdef CONFIG_USB_LIBUSB
+ xen_be_register("qusb", &xen_usb_ops);
+#endif
/* configure framebuffer */
if (xenfb_enabled) {
diff --git a/include/hw/xen/xen_backend.h b/include/hw/xen/xen_backend.h
index 63364f7..6e18a46 100644
--- a/include/hw/xen/xen_backend.h
+++ b/include/hw/xen/xen_backend.h
@@ -101,6 +101,9 @@ extern struct XenDevOps xen_kbdmouse_ops; /*
xen_framebuffer.c */
extern struct XenDevOps xen_framebuffer_ops; /* xen_framebuffer.c */
extern struct XenDevOps xen_blkdev_ops; /* xen_disk.c */
extern struct XenDevOps xen_netdev_ops; /* xen_nic.c */
+#ifdef CONFIG_USB_LIBUSB
+extern struct XenDevOps xen_usb_ops; /* xen-usb.c */
+#endif
void xen_init_display(int domid);
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index bd65e67..d010cee 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -49,6 +49,8 @@ typedef xc_gnttab xengnttab_handle;
#define xengnttab_unmap(h, a, n) xc_gnttab_munmap(h, a, n)
#define xengnttab_map_grant_refs(h, c, d, r, p) \
xc_gnttab_map_grant_refs(h, c, d, r, p)
+#define xengnttab_map_domain_grant_refs(h, c, d, r, p) \
+ xc_gnttab_map_domain_grant_refs(h, c, d, r, p)
#define xenforeignmemory_open(l, f) xen_xc
--
2.6.6
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