Author: hselasky
Date: Mon Jan 7 16:38:13 2013
New Revision: 245132
URL: http://svnweb.freebsd.org/changeset/base/245132
Log:
Optimise the XHCI interrupt handling.
This patch will save CPU time when the XHCI interrupt is
shared with other devices.
Only check event rings when interrupt bits are set.
Otherwise would indicate hiding possible hardware fault(s).
Tested by: sos @
Submitted by: sos @
MFC after: 1 week
Modified:
head/sys/dev/usb/controller/xhci.c
Modified: head/sys/dev/usb/controller/xhci.c
==============================================================================
--- head/sys/dev/usb/controller/xhci.c Mon Jan 7 15:46:10 2013
(r245131)
+++ head/sys/dev/usb/controller/xhci.c Mon Jan 7 16:38:13 2013
(r245132)
@@ -1459,7 +1459,9 @@ xhci_interrupt(struct xhci_softc *sc)
DPRINTFN(16, "real interrupt (sts=0x%08x, "
"iman=0x%08x)\n", status, temp);
- if (status != 0) {
+ if (status & (XHCI_STS_PCD | XHCI_STS_HCH |
+ XHCI_STS_HSE | XHCI_STS_HCE)) {
+
if (status & XHCI_STS_PCD) {
xhci_root_intr(sc);
}
@@ -1480,7 +1482,9 @@ xhci_interrupt(struct xhci_softc *sc)
}
}
- xhci_interrupt_poll(sc);
+ /* check if we need to check the event rings */
+ if ((status != 0) || (temp & XHCI_IMAN_INTR_PEND))
+ xhci_interrupt_poll(sc);
USB_BUS_UNLOCK(&sc->sc_bus);
}
_______________________________________________
svn-src-all@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
