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usb: add pipelining option to usb endpoints

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With this patch applied USB drivers can enable pipelining per endpoint.
With pipelining enabled the usb core will continue submitting packets
even when there are still async transfers in flight instead of passing
them on one by one.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-03-01 14:39:28 +01:00
parent eb9d4673e3
commit 7936e0f0d2
2 changed files with 12 additions and 1 deletions
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11
hw/usb.c
View file

@ -323,7 +323,7 @@ int usb_handle_packet(USBDevice *dev, USBPacket *p)
assert(p->state == USB_PACKET_SETUP);
assert(p->ep != NULL);
if (QTAILQ_EMPTY(&p->ep->queue)) {
if (QTAILQ_EMPTY(&p->ep->queue) || p->ep->pipeline) {
ret = usb_process_one(p);
if (ret == USB_RET_ASYNC) {
usb_packet_set_state(p, USB_PACKET_ASYNC);
@ -468,6 +468,7 @@ void usb_ep_init(USBDevice *dev)
dev->ep_ctl.type = USB_ENDPOINT_XFER_CONTROL;
dev->ep_ctl.ifnum = 0;
dev->ep_ctl.dev = dev;
dev->ep_ctl.pipeline = false;
QTAILQ_INIT(&dev->ep_ctl.queue);
for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
dev->ep_in[ep].nr = ep + 1;
@ -480,6 +481,8 @@ void usb_ep_init(USBDevice *dev)
dev->ep_out[ep].ifnum = 0;
dev->ep_in[ep].dev = dev;
dev->ep_out[ep].dev = dev;
dev->ep_in[ep].pipeline = false;
dev->ep_out[ep].pipeline = false;
QTAILQ_INIT(&dev->ep_in[ep].queue);
QTAILQ_INIT(&dev->ep_out[ep].queue);
}
@ -593,3 +596,9 @@ int usb_ep_get_max_packet_size(USBDevice *dev, int pid, int ep)
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
return uep->max_packet_size;
}
void usb_ep_set_pipeline(USBDevice *dev, int pid, int ep, bool enabled)
{
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
uep->pipeline = enabled;
}