Improve the realtime properties of USB transfers for embedded systems

like RPI-B and RPI-2.

Description of problem:
USB transfers can process data in their callbacks sometimes causing
unacceptable latency for other USB transfers. Separate BULK completion
callbacks from CONTROL, INTERRUPT and ISOCHRONOUS callbacks, and give
BULK completion callbacks lesser execution priority than the
others. This way USB audio won't be interfered by heavy USB ethernet
usage for example.

Further serve USB transfer completion in a round robin fashion,
instead of only serving the most CPU hungry. This has been done by
adding a third flag to USB transfer queue structure which keeps track
of looping callbacks. The "command" callback function then decides
what to do when looping.

MFC after:		2 weeks

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/dev/usb/usb_hub.c b/sys/dev/usb/usb_hub.c
index 2f1459c696b3..a54fa2e0c838 100644
--- a/sys/dev/usb/usb_hub.c
+++ b/sys/dev/usb/usb_hub.c
@@ -346,7 +346,7 @@ uhub_tt_buffer_reset_async_locked(struct usb_device *child, struct usb_endpoint
 	}
 	up->req_reset_tt = req;
 	/* get reset transfer started */
-	usb_proc_msignal(USB_BUS_NON_GIANT_PROC(udev->bus),
+	usb_proc_msignal(USB_BUS_TT_PROC(udev->bus),
 	    &hub->tt_msg[0], &hub->tt_msg[1]);
 }
 #endif
@@ -1579,7 +1579,7 @@ uhub_detach(device_t dev)
 #if USB_HAVE_TT_SUPPORT
 	/* Make sure our TT messages are not queued anywhere */
 	USB_BUS_LOCK(bus);
-	usb_proc_mwait(USB_BUS_NON_GIANT_PROC(bus),
+	usb_proc_mwait(USB_BUS_TT_PROC(bus),
 	    &hub->tt_msg[0], &hub->tt_msg[1]);
 	USB_BUS_UNLOCK(bus);
 #endif