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[src/nick-nhusb]: src/sys/dev/usb Make interrupt handling MP safe by not drop...
details: https://anonhg.NetBSD.org/src/rev/c42c0748fba6
branches: nick-nhusb
changeset: 804528:c42c0748fba6
user: skrll <skrll%NetBSD.org@localhost>
date: Sat Feb 06 10:21:45 2016 +0000
description:
Make interrupt handling MP safe by not dropping the bus lock while
traversing the active transfer list. Instead move the complete transfers
from the active list to a complete list and do callbacks on this complete
list.
usbd_transfer_complete can safely drop the bus lock while traversing this
private list.
diffstat:
sys/dev/usb/ehci.c | 157 ++++++++++++++++++++++++++--------------------------
1 files changed, 79 insertions(+), 78 deletions(-)
diffs (299 lines):
diff -r 4f839f6ee2c2 -r c42c0748fba6 sys/dev/usb/ehci.c
--- a/sys/dev/usb/ehci.c Sat Feb 06 09:02:57 2016 +0000
+++ b/sys/dev/usb/ehci.c Sat Feb 06 10:21:45 2016 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ehci.c,v 1.234.2.82 2016/02/06 09:02:57 skrll Exp $ */
+/* $NetBSD: ehci.c,v 1.234.2.83 2016/02/06 10:21:45 skrll Exp $ */
/*
* Copyright (c) 2004-2012 The NetBSD Foundation, Inc.
@@ -53,7 +53,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ehci.c,v 1.234.2.82 2016/02/06 09:02:57 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ehci.c,v 1.234.2.83 2016/02/06 10:21:45 skrll Exp $");
#include "ohci.h"
#include "uhci.h"
@@ -148,16 +148,20 @@
};
};
+typedef TAILQ_HEAD(ex_completeq, ehci_xfer) ex_completeq_t;
+
Static usbd_status ehci_open(struct usbd_pipe *);
Static void ehci_poll(struct usbd_bus *);
Static void ehci_softintr(void *);
Static int ehci_intr1(ehci_softc_t *);
Static void ehci_waitintr(ehci_softc_t *, struct usbd_xfer *);
-Static void ehci_check_intr(ehci_softc_t *, struct ehci_xfer *);
-Static void ehci_check_qh_intr(ehci_softc_t *, struct ehci_xfer *);
-Static void ehci_check_itd_intr(ehci_softc_t *, struct ehci_xfer *);
-Static void ehci_check_sitd_intr(ehci_softc_t *, struct ehci_xfer *);
-Static void ehci_idone(struct ehci_xfer *);
+Static void ehci_check_qh_intr(ehci_softc_t *, struct ehci_xfer *,
+ ex_completeq_t *);
+Static void ehci_check_itd_intr(ehci_softc_t *, struct ehci_xfer *,
+ ex_completeq_t *);
+Static void ehci_check_sitd_intr(ehci_softc_t *, struct ehci_xfer *,
+ ex_completeq_t *);
+Static void ehci_idone(struct ehci_xfer *, ex_completeq_t *);
Static void ehci_timeout(void *);
Static void ehci_timeout_task(void *);
Static void ehci_intrlist_timeout(void *);
@@ -292,14 +296,19 @@
#define EHCI_NULL htole32(EHCI_LINK_TERMINATE)
-#define ehci_add_intr_list(sc, ex) \
- TAILQ_INSERT_TAIL(&(sc)->sc_intrhead, (ex), ex_next);
-#define ehci_del_intr_list(sc, ex) \
- do { \
- TAILQ_REMOVE(&sc->sc_intrhead, (ex), ex_next); \
- (ex)->ex_next.tqe_prev = NULL; \
- } while (0)
-#define ehci_active_intr_list(ex) ((ex)->ex_next.tqe_prev != NULL)
+static inline void
+ehci_add_intr_list(ehci_softc_t *sc, struct ehci_xfer *ex)
+{
+
+ TAILQ_INSERT_TAIL(&sc->sc_intrhead, ex, ex_next);
+}
+
+static inline void
+ehci_del_intr_list(ehci_softc_t *sc, struct ehci_xfer *ex)
+{
+
+ TAILQ_REMOVE(&sc->sc_intrhead, ex, ex_next);
+}
Static const struct usbd_bus_methods ehci_bus_methods = {
.ubm_open = ehci_open,
@@ -790,15 +799,46 @@
USBHIST_FUNC(); USBHIST_CALLED(ehcidebug);
+ ex_completeq_t cq;
+ TAILQ_INIT(&cq);
+
/*
* The only explanation I can think of for why EHCI is as brain dead
* as UHCI interrupt-wise is that Intel was involved in both.
* An interrupt just tells us that something is done, we have no
* clue what, so we need to scan through all active transfers. :-(
*/
- for (ex = TAILQ_FIRST(&sc->sc_intrhead); ex; ex = nextex) {
- nextex = TAILQ_NEXT(ex, ex_next);
- ehci_check_intr(sc, ex);
+
+ /*
+ * ehci_idone will remove transfer from sc->sc_intrhead if it's
+ * complete and add to our cq list
+ * */
+ TAILQ_FOREACH_SAFE(ex, &sc->sc_intrhead, ex_next, nextex) {
+ switch (ex->ex_type) {
+ case EX_CTRL:
+ case EX_BULK:
+ case EX_INTR:
+ ehci_check_qh_intr(sc, ex, &cq);
+ break;
+ case EX_ISOC:
+ ehci_check_itd_intr(sc, ex, &cq);
+ break;
+ case EX_FS_ISOC:
+ ehci_check_sitd_intr(sc, ex, &cq);
+ break;
+ default:
+ KASSERT(false);
+ }
+
+ }
+
+ TAILQ_FOREACH_SAFE(ex, &cq, ex_next, nextex) {
+ /*
+ * XXX transfer_complete memcpys out transfer data (for in
+ * endpoints) during this call, before methods->done is called.
+ * A dma sync required beforehand.
+ */
+ usb_transfer_complete(&ex->ex_xfer);
}
/* Schedule a callout to catch any dropped transactions. */
@@ -813,37 +853,8 @@
}
}
-/* Check for an interrupt. */
Static void
-ehci_check_intr(ehci_softc_t *sc, struct ehci_xfer *ex)
-{
-
- USBHIST_FUNC(); USBHIST_CALLED(ehcidebug);
- USBHIST_LOG(ehcidebug, "ex = %p", ex, 0, 0, 0);
-
- KASSERT(sc->sc_bus.ub_usepolling || mutex_owned(&sc->sc_lock));
-
- switch (ex->ex_type) {
- case EX_CTRL:
- case EX_BULK:
- case EX_INTR:
- ehci_check_qh_intr(sc, ex);
- break;
- case EX_ISOC:
- ehci_check_itd_intr(sc, ex);
- break;
- case EX_FS_ISOC:
- ehci_check_sitd_intr(sc, ex);
- break;
- default:
- KASSERT(false);
- }
-
- return;
-}
-
-Static void
-ehci_check_qh_intr(ehci_softc_t *sc, struct ehci_xfer *ex)
+ehci_check_qh_intr(ehci_softc_t *sc, struct ehci_xfer *ex, ex_completeq_t *cq)
{
ehci_soft_qtd_t *sqtd, *fsqtd, *lsqtd;
uint32_t status;
@@ -924,11 +935,11 @@
done:
USBHIST_LOGN(ehcidebug, 10, "ex=%p done", ex, 0, 0, 0);
callout_stop(&ex->ex_xfer.ux_callout);
- ehci_idone(ex);
+ ehci_idone(ex, cq);
}
Static void
-ehci_check_itd_intr(ehci_softc_t *sc, struct ehci_xfer *ex)
+ehci_check_itd_intr(ehci_softc_t *sc, struct ehci_xfer *ex, ex_completeq_t *cq)
{
ehci_soft_itd_t *itd;
int i;
@@ -971,11 +982,11 @@
done:
USBHIST_LOG(ehcidebug, "ex %p done", ex, 0, 0, 0);
callout_stop(&ex->ex_xfer.ux_callout);
- ehci_idone(ex);
+ ehci_idone(ex, cq);
}
void
-ehci_check_sitd_intr(ehci_softc_t *sc, struct ehci_xfer *ex)
+ehci_check_sitd_intr(ehci_softc_t *sc, struct ehci_xfer *ex, ex_completeq_t *cq)
{
ehci_soft_sitd_t *sitd;
@@ -1009,12 +1020,12 @@
USBHIST_LOGN(ehcidebug, 10, "ex=%p done", ex, 0, 0, 0);
callout_stop(&(ex->ex_xfer.ux_callout));
- ehci_idone(ex);
+ ehci_idone(ex, cq);
}
Static void
-ehci_idone(struct ehci_xfer *ex)
+ehci_idone(struct ehci_xfer *ex, ex_completeq_t *cq)
{
struct usbd_xfer *xfer = &ex->ex_xfer;
struct ehci_pipe *epipe = EHCI_XFER2EPIPE(xfer);
@@ -3264,6 +3275,7 @@
*/
xfer->ux_status = status; /* make software ignore it */
callout_stop(&xfer->ux_callout);
+ ehci_del_intr_list(sc, exfer);
usb_syncmem(&sqh->dma,
sqh->offs + offsetof(ehci_qh_t, qh_qtd.qtd_status),
@@ -3783,8 +3795,7 @@
Static void
ehci_device_ctrl_done(struct usbd_xfer *xfer)
{
- struct ehci_xfer *ex = EHCI_XFER2EXFER(xfer);
- ehci_softc_t *sc = EHCI_XFER2SC(xfer);
+ ehci_softc_t *sc __diagused = EHCI_XFER2SC(xfer);
struct ehci_pipe *epipe = EHCI_XFER2EPIPE(xfer);
usb_device_request_t *req = &xfer->ux_request;
int len = UGETW(req->wLength);
@@ -3796,14 +3807,11 @@
KASSERT(sc->sc_bus.ub_usepolling || mutex_owned(&sc->sc_lock));
KASSERT(xfer->ux_rqflags & URQ_REQUEST);
- if (xfer->ux_status != USBD_NOMEM && ehci_active_intr_list(ex)) {
- ehci_del_intr_list(sc, ex); /* remove from active list */
- usb_syncmem(&epipe->ctrl.reqdma, 0, sizeof(*req),
- BUS_DMASYNC_POSTWRITE);
- if (len)
- usb_syncmem(&xfer->ux_dmabuf, 0, len,
- rd ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
- }
+ usb_syncmem(&epipe->ctrl.reqdma, 0, sizeof(*req),
+ BUS_DMASYNC_POSTWRITE);
+ if (len)
+ usb_syncmem(&xfer->ux_dmabuf, 0, len,
+ rd ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
USBHIST_LOG(ehcidebug, "length=%d", xfer->ux_actlen, 0, 0, 0);
}
@@ -4019,8 +4027,7 @@
Static void
ehci_device_bulk_done(struct usbd_xfer *xfer)
{
- struct ehci_xfer *ex = EHCI_XFER2EXFER(xfer);
- ehci_softc_t *sc = EHCI_XFER2SC(xfer);
+ ehci_softc_t *sc __diagused = EHCI_XFER2SC(xfer);
struct ehci_pipe *epipe = EHCI_XFER2EPIPE(xfer);
int endpt = epipe->pipe.up_endpoint->ue_edesc->bEndpointAddress;
int rd = UE_GET_DIR(endpt) == UE_DIR_IN;
@@ -4032,11 +4039,8 @@
KASSERT(mutex_owned(&sc->sc_lock));
- if (xfer->ux_status != USBD_NOMEM && ehci_active_intr_list(ex)) {
- ehci_del_intr_list(sc, ex); /* remove from active list */
- usb_syncmem(&xfer->ux_dmabuf, 0, xfer->ux_length,
- rd ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
- }
+ usb_syncmem(&xfer->ux_dmabuf, 0, xfer->ux_length,
+ rd ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
USBHIST_LOG(ehcidebug, "length=%d", xfer->ux_actlen, 0, 0, 0);
}
@@ -4281,10 +4285,9 @@
callout_reset(&xfer->ux_callout,
mstohz(xfer->ux_timeout), ehci_timeout, xfer);
}
-
+ ehci_add_intr_list(sc, exfer);
xfer->ux_status = USBD_IN_PROGRESS;
- } else if (xfer->ux_status != USBD_NOMEM && ehci_active_intr_list(exfer)) {
- ehci_del_intr_list(sc, exfer); /* remove from active list */
+ } else {
endpt = epipe->pipe.up_endpoint->ue_edesc->bEndpointAddress;
isread = UE_GET_DIR(endpt) == UE_DIR_IN;
usb_syncmem(&xfer->ux_dmabuf, 0, xfer->ux_length,
@@ -4678,8 +4681,7 @@
KASSERT(mutex_owned(&sc->sc_lock));
epipe->isoc.cur_xfers--;
- if (xfer->ux_status != USBD_NOMEM && ehci_active_intr_list(exfer)) {
- ehci_del_intr_list(sc, exfer);
+ if (exfer->ex_isrunning) {
ehci_remove_sitd_chain(sc, exfer->ex_itdstart);
exfer->ex_isrunning = false;
}
@@ -5101,8 +5103,7 @@
KASSERT(mutex_owned(&sc->sc_lock));
epipe->isoc.cur_xfers--;
- if (xfer->ux_status != USBD_NOMEM && ehci_active_intr_list(exfer)) {
- ehci_del_intr_list(sc, exfer);
+ if (exfer->ex_isrunning) {
ehci_remove_itd_chain(sc, exfer->ex_sitdstart);
exfer->ex_isrunning = false;
}
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