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56f9dde414
xemu/hw/usb/xen-usb.c
Markus Armbruster 56f9dde414 xen: Fix and improve handling of device_add usb-host errors 
usbback_portid_add() leaks the error when qdev_device_add() fails.
Fix that.  While there, use the error to improve the error message.

The qemu_opts_from_qdict() similarly leaks on failure.  But any
failure there is a programming error.  Pass &error_abort.

Fixes: 816ac92ef7
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Paul Durrant <paul@xen.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: xen-devel@lists.xenproject.org
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200505101908.6207-3-armbru@redhat.com>
Acked-by: Paul Durrant <paul@xen.org>
2020-05-27 07:45:17 +02:00

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/*
* xen paravirt usb device backend
*
* (c) Juergen Gross <jgross@suse.com>
*
* 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 "qemu/osdep.h"
#include <libusb.h>
#include <sys/user.h>
#include "qemu/config-file.h"
#include "qemu/main-loop.h"
#include "qemu/option.h"
#include "hw/sysbus.h"
#include "hw/usb.h"
#include "hw/xen/xen-legacy-backend.h"
#include "monitor/qdev.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
#include "hw/xen/interface/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_pv_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(, 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;
bool cancelled;
};
struct usbback_hotplug {
QSIMPLEQ_ENTRY(usbback_hotplug) q;
unsigned port;
};
struct usbback_info {
struct XenLegacyDevice 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(, usbback_req) req_free_q;
QSIMPLEQ_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 XenLegacyDevice *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_pv_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 > XC_PAGE_SIZE) {
xen_pv_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 =
xen_be_map_grant_refs(xendev, ref, usbback_req->nr_buffer_segs,
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 * XC_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_pv_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 =
xen_be_map_grant_refs(xendev, ref, usbback_req->nr_extra_segs,
prot);
if (!usbback_req->isoc_buffer) {
return -ENOMEM;
}
return 0;
}
static int usbback_init_packet(struct usbback_req *usbback_req)
{
struct XenLegacyDevice *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: %"PRIx64", 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 XenLegacyDevice *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) {
xen_be_unmap_grant_refs(xendev, usbback_req->buffer,
usbback_req->nr_buffer_segs);
usbback_req->buffer = NULL;
}
if (usbback_req->isoc_buffer) {
xen_be_unmap_grant_refs(xendev, usbback_req->isoc_buffer,
usbback_req->nr_extra_segs);
usbback_req->isoc_buffer = NULL;
}
if (usbif->urb_sring) {
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_pv_send_notify(xendev);
}
}
if (!usbback_req->cancelled)
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(struct usbback_req *usbback_req)
{
USBPacket *packet = &usbback_req->packet;
int32_t status;
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 void usbback_cancel_req(struct usbback_req *usbback_req)
{
if (usb_packet_is_inflight(&usbback_req->packet)) {
usb_cancel_packet(&usbback_req->packet);
QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q);
usbback_req->cancelled = true;
usbback_do_response_ret(usbback_req, -EPROTO);
}
}
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) - 1;
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) {
usbback_cancel_req(unlink_req);
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_pv_printf(&usbif->xendev, 0, "invalid request\n");
ret = -ESHUTDOWN;
goto fail_free_urb;
}
ret = usbback_gnttab_map(usbback_req);
if (ret) {
xen_pv_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);
}
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_pv_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_pv_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_pv_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_drain(struct usbback_info *usbif, unsigned port)
{
struct usbback_req *req, *tmp;
bool sched = false;
QTAILQ_FOREACH_SAFE(req, &usbif->ports[port - 1].submit_q, q, tmp) {
usbback_cancel_req(req);
sched = true;
}
if (sched) {
qemu_bh_schedule(usbif->bh);
}
}
static void usbback_portid_detach(struct usbback_info *usbif, unsigned port)
{
if (!usbif->ports[port - 1].attached) {
return;
}
usbif->ports[port - 1].speed = USBIF_SPEED_NONE;
usbif->ports[port - 1].attached = false;
usbback_portid_drain(usbif, port);
usbback_hotplug_enq(usbif, port);
}
static void usbback_portid_remove(struct usbback_info *usbif, unsigned port)
{
if (!usbif->ports[port - 1].dev) {
return;
}
object_unparent(OBJECT(usbif->ports[port - 1].dev));
usbif->ports[port - 1].dev = NULL;
usbback_portid_detach(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;
Error *local_err = NULL;
QDict *qdict;
QemuOpts *opts;
char *tmp;
if (usbif->ports[port - 1].dev) {
return;
}
portname = strchr(busid, '-');
if (!portname) {
xen_pv_printf(&usbif->xendev, 0, "device %s illegal specification\n",
busid);
return;
}
portname++;
qdict = qdict_new();
qdict_put_str(qdict, "driver", "usb-host");
tmp = g_strdup_printf("%s.0", usbif->xendev.qdev.id);
qdict_put_str(qdict, "bus", tmp);
g_free(tmp);
tmp = g_strdup_printf("%s-%u", usbif->xendev.qdev.id, port);
qdict_put_str(qdict, "id", tmp);
g_free(tmp);
qdict_put_int(qdict, "port", port);
qdict_put_int(qdict, "hostbus", atoi(busid));
qdict_put_str(qdict, "hostport", portname);
opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict,
&error_abort);
usbif->ports[port - 1].dev = USB_DEVICE(qdev_device_add(opts, &local_err));
if (!usbif->ports[port - 1].dev) {
qobject_unref(qdict);
xen_pv_printf(&usbif->xendev, 0,
"device %s could not be opened: %s\n",
busid, error_get_pretty(local_err));
error_free(local_err);
return;
}
qobject_unref(qdict);
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_pv_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);
}
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_pv_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 XenLegacyDevice *xendev)
{
struct usbback_info *usbif;
unsigned int i;
TR_BUS(xendev, "start\n");
usbif = container_of(xendev, struct usbback_info, xendev);
xen_pv_unbind_evtchn(xendev);
if (usbif->urb_sring) {
xen_be_unmap_grant_ref(xendev, usbif->urb_sring);
usbif->urb_sring = NULL;
}
if (usbif->conn_sring) {
xen_be_unmap_grant_ref(xendev, usbif->conn_sring);
usbif->conn_sring = NULL;
}
for (i = 0; i < usbif->num_ports; i++) {
if (usbif->ports[i].dev) {
usbback_portid_drain(usbif, i + 1);
}
}
TR_BUS(xendev, "finished\n");
}
static int usbback_connect(struct XenLegacyDevice *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, max_grants;
TR_BUS(xendev, "start\n");
/* max_grants: for each request and for the rings (request and connect). */
max_grants = USBIF_MAX_SEGMENTS_PER_REQUEST * USB_URB_RING_SIZE + 2;
xen_be_set_max_grant_refs(xendev, max_grants);
usbif = container_of(xendev, struct usbback_info, xendev);
if (xenstore_read_fe_int(xendev, "urb-ring-ref", &urb_ring_ref)) {
xen_pv_printf(xendev, 0, "error reading urb-ring-ref\n");
return -1;
}
if (xenstore_read_fe_int(xendev, "conn-ring-ref", &conn_ring_ref)) {
xen_pv_printf(xendev, 0, "error reading conn-ring-ref\n");
return -1;
}
if (xenstore_read_fe_int(xendev, "event-channel", &xendev->remote_port)) {
xen_pv_printf(xendev, 0, "error reading event-channel\n");
return -1;
}
usbif->urb_sring = xen_be_map_grant_ref(xendev, urb_ring_ref,
PROT_READ | PROT_WRITE);
usbif->conn_sring = xen_be_map_grant_ref(xendev, conn_ring_ref,
PROT_READ | PROT_WRITE);
if (!usbif->urb_sring || !usbif->conn_sring) {
xen_pv_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_pv_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 XenLegacyDevice *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 XenLegacyDevice *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_pv_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_pv_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");
usbback_portid_detach(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_req *usbback_req;
struct usbback_info *usbif;
usbback_req = container_of(packet, struct usbback_req, packet);
if (usbback_req->cancelled) {
g_free(usbback_req);
return;
}
usbif = usbback_req->usbif;
TR_REQ(&usbif->xendev, "\n");
usbback_packet_complete(usbback_req);
}
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 XenLegacyDevice *xendev)
{
struct usbback_info *usbif;
USBPort *p;
unsigned int i;
usbif = container_of(xendev, struct usbback_info, xendev);
usb_bus_new(&usbif->bus, sizeof(usbif->bus), &xen_usb_bus_ops,
DEVICE(&xendev->qdev));
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);
}
QTAILQ_INIT(&usbif->req_free_q);
QSIMPLEQ_INIT(&usbif->hotplug_q);
usbif->bh = qemu_bh_new(usbback_bh, usbif);
}
static int usbback_free(struct XenLegacyDevice *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 XenLegacyDevice *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
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