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usb-host: add special case for bus+addr

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This patch changes usb-host behavior in case we hostbus= and hostaddr=
properties are used to identify the usb device in question.  Instead of
adding the device to the hotplug watchlist we try to open directly using
the given bus number and device address.

Putting a device specified by hostaddr to the hotplug watchlist isn't
a great idea as the address isn't a fixed property.  It changes every
time the device is plugged in.  So considering this case as "use the
device at bus:addr _now_" is more sane.  Also usb-host will throw errors
in case it can't initialize the host device.

Note: For devices on the hotplug watchlist (hostport or vendorid or
productid specified) qemu continues to ignore errors and keeps
monitoring the usb bus to see if the device eventually shows up.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1464945175-28939-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2016-06-03 11:12:55 +02:00
parent da2fdd0bd1
commit e058fa2dd5
1 changed files with 52 additions and 4 deletions
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56
hw/usb/host-libusb.c
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@ -81,6 +81,7 @@ struct USBHostDevice {
uint32_t iso_urb_frames;
uint32_t options;
uint32_t loglevel;
bool needs_autoscan;
/* state */
QTAILQ_ENTRY(USBHostDevice) next;
@ -974,9 +975,32 @@ static void usb_host_exit_notifier(struct Notifier *n, void *data)
}
}
static libusb_device *usb_host_find_ref(int bus, int addr)
{
libusb_device **devs = NULL;
libusb_device *ret = NULL;
int i, n;
if (usb_host_init() != 0) {
return NULL;
}
n = libusb_get_device_list(ctx, &devs);
for (i = 0; i < n; i++) {
if (libusb_get_bus_number(devs[i]) == bus &&
libusb_get_device_address(devs[i]) == addr) {
ret = libusb_ref_device(devs[i]);
break;
}
}
libusb_free_device_list(devs, 1);
return ret;
}
static void usb_host_realize(USBDevice *udev, Error **errp)
{
USBHostDevice *s = USB_HOST_DEVICE(udev);
libusb_device *ldev;
int rc;
if (s->match.vendor_id > 0xffff) {
error_setg(errp, "vendorid out of range");
@ -997,11 +1021,33 @@ static void usb_host_realize(USBDevice *udev, Error **errp)
QTAILQ_INIT(&s->requests);
QTAILQ_INIT(&s->isorings);
if (s->match.addr && s->match.bus_num &&
!s->match.vendor_id &&
!s->match.product_id &&
!s->match.port) {
s->needs_autoscan = false;
ldev = usb_host_find_ref(s->match.bus_num,
s->match.addr);
if (!ldev) {
error_setg(errp, "failed to find host usb device %d:%d",
s->match.bus_num, s->match.addr);
return;
}
rc = usb_host_open(s, ldev);
libusb_unref_device(ldev);
if (rc < 0) {
error_setg(errp, "failed to open host usb device %d:%d",
s->match.bus_num, s->match.addr);
return;
}
} else {
s->needs_autoscan = true;
QTAILQ_INSERT_TAIL(&hostdevs, s, next);
usb_host_auto_check(NULL);
}
s->exit.notify = usb_host_exit_notifier;
qemu_add_exit_notifier(&s->exit);
QTAILQ_INSERT_TAIL(&hostdevs, s, next);
usb_host_auto_check(NULL);
}
static void usb_host_instance_init(Object *obj)
@ -1019,7 +1065,9 @@ static void usb_host_handle_destroy(USBDevice *udev)
USBHostDevice *s = USB_HOST_DEVICE(udev);
qemu_remove_exit_notifier(&s->exit);
QTAILQ_REMOVE(&hostdevs, s, next);
if (s->needs_autoscan) {
QTAILQ_REMOVE(&hostdevs, s, next);
}
usb_host_close(s);
}