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qemu/hw/usb/xen-usb.c
Peter Maydell 1aef27c93d hw/usb/xen-usb.c: Pass struct usbback_req* to usbback_packet_complete() 
The function usbback_packet_complete() currently takes a USBPacket*,
which must be a pointer to the packet field within a struct
usbback_req; the function uses container_of() to get the struct
usbback_req* given the USBPacket*.

This is unnecessarily confusing (and in particular it confuses the
Coverity Scan analysis, resulting in the false positive CID 1421919
where it thinks that we write off the end of the structure). Since
both callsites already have the pointer to the struct usbback_req,
just pass that in directly.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Message-Id: <20200323164318.26567-1-peter.maydell@linaro.org>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
2020-04-07 16:13:26 +01:00

1100 lines
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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/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, &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;
}
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);
return;
err:
qobject_unref(qdict);
xen_pv_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_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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