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authorHans de Goede <hdegoede@redhat.com>2012-12-14 14:35:40 +0100
committerGerd Hoffmann <kraxel@redhat.com>2013-01-07 12:57:24 +0100
commitf79738b03ba55a5c9733c6dc2455964a6f8fdac9 (patch)
tree4db8cd46eea9bac633026cbf2376be791b695487 /hw/usb/bus.c
parent6735d433729f80fab80c0a1f70ae131398645613 (diff)
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usb: Add an usb_device_ep_stopped USBDevice method
Some usb devices (host or network redirection) can benefit from knowing when the guest stops using an endpoint. Redirection may involve submitting packets independently from the guest (in combination with a fifo buffer between the redirection code and the guest), to ensure that buffers of the real usb device are timely emptied. This is done for example for isoc traffic and for interrupt input endpoints. But when the (re)submission of packets is done by the device code, then how does it know when to stop this? For isoc endpoints this is handled by detecting a set interface (change alt setting) command, which works well for isoc endpoints. But for interrupt endpoints currently the redirection code never stops receiving data from the device, which is less then ideal. However the controller emulation is aware when a guest looses interest, as then the qh for the endpoint gets unlinked (ehci, ohci, uhci) or the endpoint is explicitly stopped (xhci). This patch adds a new ep_stopped USBDevice method and modifies the hcd code to call this on queue unlink / ep stop. This makes it possible for the redirection code to properly stop receiving interrupt input (*) data when the guest no longer has interest in it. *) And in the future also buffered bulk input. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'hw/usb/bus.c')
-rw-r--r--hw/usb/bus.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/hw/usb/bus.c b/hw/usb/bus.c
index 10260a1..180d1d7 100644
--- a/hw/usb/bus.c
+++ b/hw/usb/bus.c
@@ -189,6 +189,14 @@ void usb_device_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
}
}
+void usb_device_ep_stopped(USBDevice *dev, USBEndpoint *ep)
+{
+ USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
+ if (klass->ep_stopped) {
+ klass->ep_stopped(dev, ep);
+ }
+}
+
static int usb_qdev_init(DeviceState *qdev)
{
USBDevice *dev = USB_DEVICE(qdev);