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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/1876c0eed8d7
branches: nick-nhusb
changeset: 804542:1876c0eed8d7
user: skrll <skrll%NetBSD.org@localhost>
date: Tue Feb 16 21:17:27 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 while holding the bus lock.
Once the interrupt list has been traversed we can do callbacks on the
complete list. usbd_transfer_complete can safely drop the bus lock while
traversing this private list.
diffstat:
sys/dev/usb/uhci.c | 104 ++++++++++++++++++++++++++++------------------------
1 files changed, 56 insertions(+), 48 deletions(-)
diffs (280 lines):
diff -r bcba1d5dd494 -r 1876c0eed8d7 sys/dev/usb/uhci.c
--- a/sys/dev/usb/uhci.c Tue Feb 16 08:02:49 2016 +0000
+++ b/sys/dev/usb/uhci.c Tue Feb 16 21:17:27 2016 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: uhci.c,v 1.264.4.60 2016/02/16 07:30:46 skrll Exp $ */
+/* $NetBSD: uhci.c,v 1.264.4.61 2016/02/16 21:17:27 skrll Exp $ */
/*
* Copyright (c) 1998, 2004, 2011, 2012 The NetBSD Foundation, Inc.
@@ -42,7 +42,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uhci.c,v 1.264.4.60 2016/02/16 07:30:46 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uhci.c,v 1.264.4.61 2016/02/16 21:17:27 skrll Exp $");
#include "opt_usb.h"
@@ -159,6 +159,8 @@
};
};
+typedef TAILQ_HEAD(ux_completeq, uhci_xfer) ux_completeq_t;
+
Static void uhci_globalreset(uhci_softc_t *);
Static usbd_status uhci_portreset(uhci_softc_t*, int);
Static void uhci_reset(uhci_softc_t *);
@@ -185,8 +187,9 @@
Static void uhci_poll_hub(void *);
Static void uhci_waitintr(uhci_softc_t *, struct usbd_xfer *);
-Static void uhci_check_intr(uhci_softc_t *, struct uhci_xfer *);
-Static void uhci_idone(struct uhci_xfer *);
+Static void uhci_check_intr(uhci_softc_t *, struct uhci_xfer *,
+ ux_completeq_t *);
+Static void uhci_idone(struct uhci_xfer *, ux_completeq_t *);
Static void uhci_abort_xfer(struct usbd_xfer *, usbd_status);
@@ -383,14 +386,19 @@
.upm_done = uhci_device_isoc_done,
};
-#define uhci_add_intr_list(sc, ux) \
- TAILQ_INSERT_TAIL(&(sc)->sc_intrhead, (ux), ux_list)
-#define uhci_del_intr_list(sc, ux) \
- do { \
- TAILQ_REMOVE(&(sc)->sc_intrhead, (ux), ux_list); \
- (ux)->ux_list.tqe_prev = NULL; \
- } while (0)
-#define uhci_active_intr_list(ux) ((ux)->ux_list.tqe_prev != NULL)
+static inline void
+uhci_add_intr_list(uhci_softc_t *sc, struct uhci_xfer *ux)
+{
+
+ TAILQ_INSERT_TAIL(&sc->sc_intrhead, ux, ux_list);
+}
+
+static inline void
+uhci_del_intr_list(uhci_softc_t *sc, struct uhci_xfer *ux)
+{
+
+ TAILQ_REMOVE(&sc->sc_intrhead, ux, ux_list);
+}
static inline uhci_soft_qh_t *
uhci_find_prev_qh(uhci_soft_qh_t *pqh, uhci_soft_qh_t *sqh)
@@ -1383,12 +1391,14 @@
struct usbd_bus *bus = v;
uhci_softc_t *sc = UHCI_BUS2SC(bus);
struct uhci_xfer *ux, *nextux;
+ ux_completeq_t cq;
UHCIHIST_FUNC(); UHCIHIST_CALLED();
DPRINTF("sc %p", sc, 0, 0, 0);
KASSERT(sc->sc_bus.ub_usepolling || mutex_owned(&sc->sc_lock));
+ TAILQ_INIT(&cq);
/*
* Interrupts on UHCI really suck. When the host controller
* interrupts because a transfer is completed there is no
@@ -1400,9 +1410,18 @@
* We scan all interrupt descriptors to see if any have
* completed.
*/
- for (ux = TAILQ_FIRST(&sc->sc_intrhead); ux; ux = nextux) {
- nextux = TAILQ_NEXT(ux, ux_list);
- uhci_check_intr(sc, ux);
+ TAILQ_FOREACH_SAFE(ux, &sc->sc_intrhead, ux_list, nextux) {
+ uhci_check_intr(sc, ux, &cq);
+ }
+
+ /*
+ * We abuse ux_list for the interrupt and complete lists and
+ * interrupt transfers will get re-added here so use
+ * the _SAFE version of TAILQ_FOREACH.
+ */
+ TAILQ_FOREACH_SAFE(ux, &cq, ux_list, nextux) {
+ DPRINTF("ux %p", ux, 0, 0, 0);
+ usb_transfer_complete(&ux->ux_xfer);
}
if (sc->sc_softwake) {
@@ -1413,7 +1432,7 @@
/* Check for an interrupt. */
void
-uhci_check_intr(uhci_softc_t *sc, struct uhci_xfer *ux)
+uhci_check_intr(uhci_softc_t *sc, struct uhci_xfer *ux, ux_completeq_t *cqp)
{
uhci_soft_td_t *std, *fstd = NULL, *lstd = NULL;
uint32_t status;
@@ -1466,7 +1485,7 @@
DPRINTFN(12, "ux=%p done", ux, 0, 0, 0);
callout_stop(&xfer->ux_callout);
- uhci_idone(ux);
+ uhci_idone(ux, cqp);
return;
}
@@ -1534,7 +1553,7 @@
/* Called with USB lock held. */
void
-uhci_idone(struct uhci_xfer *ux)
+uhci_idone(struct uhci_xfer *ux, ux_completeq_t *cqp)
{
struct usbd_xfer *xfer = &ux->ux_xfer;
uhci_softc_t *sc __diagused = UHCI_XFER2SC(xfer);
@@ -1569,7 +1588,7 @@
nframes = xfer->ux_nframes;
actlen = 0;
- n = UHCI_XFER2UXFER(xfer)->ux_curframe;
+ n = ux->ux_curframe;
for (i = 0; i < nframes; i++) {
std = stds[n];
#ifdef UHCI_DEBUG
@@ -1665,7 +1684,10 @@
}
end:
- usb_transfer_complete(xfer);
+ uhci_del_intr_list(sc, ux);
+ if (cqp)
+ TAILQ_INSERT_TAIL(cqp, ux, ux_list);
+
KASSERT(sc->sc_bus.ub_usepolling || mutex_owned(&sc->sc_lock));
DPRINTFN(12, "ux=%p done", ux, 0, 0, 0);
}
@@ -1752,7 +1774,8 @@
KASSERT(ux != NULL);
- uhci_idone(ux);
+ uhci_idone(ux, NULL);
+ usb_transfer_complete(&ux->ux_xfer);
done:
mutex_exit(&sc->sc_lock);
@@ -2437,6 +2460,8 @@
*/
xfer->ux_status = status; /* make software ignore it */
callout_stop(&xfer->ux_callout);
+ uhci_del_intr_list(sc, ux);
+
DPRINTF("stop ux=%p", ux, 0, 0, 0);
for (std = ux->ux_stdstart; std != NULL; std = std->link.std) {
usb_syncmem(&std->dma,
@@ -3133,8 +3158,9 @@
void
uhci_device_isoc_abort(struct usbd_xfer *xfer)
{
- uhci_softc_t *sc __diagused = UHCI_XFER2SC(xfer);
+ uhci_softc_t *sc = UHCI_XFER2SC(xfer);
struct uhci_pipe *upipe = UHCI_PIPE2UPIPE(xfer->ux_pipe);
+ struct uhci_xfer *ux = UHCI_XFER2UXFER(xfer);
uhci_soft_td_t **stds = upipe->isoc.stds;
uhci_soft_td_t *std;
int i, n, nframes, maxlen, len;
@@ -3152,7 +3178,7 @@
/* make hardware ignore it, */
nframes = xfer->ux_nframes;
- n = UHCI_XFER2UXFER(xfer)->ux_curframe;
+ n = ux->ux_curframe;
maxlen = 0;
for (i = 0; i < nframes; i++) {
std = stds[n];
@@ -3180,9 +3206,12 @@
delay(maxlen);
#ifdef DIAGNOSTIC
- UHCI_XFER2UXFER(xfer)->ux_isdone = true;
+ ux->ux_isdone = true;
#endif
- /* Run callback and remove from interrupt list. */
+ /* Remove from interrupt list. */
+ uhci_del_intr_list(sc, ux);
+
+ /* Run callback. */
usb_transfer_complete(xfer);
KASSERT(mutex_owned(&sc->sc_lock));
@@ -3327,18 +3356,13 @@
{
struct uhci_pipe *upipe = UHCI_PIPE2UPIPE(xfer->ux_pipe);
struct uhci_xfer *ux = UHCI_XFER2UXFER(xfer);
- uhci_softc_t *sc = UHCI_XFER2SC(xfer);
int i, offs;
int rd = UE_GET_DIR(upipe->pipe.up_endpoint->ue_edesc->bEndpointAddress) == UE_DIR_IN;
-
UHCIHIST_FUNC(); UHCIHIST_CALLED();
DPRINTFN(4, "length=%d, ux_state=0x%08x",
xfer->ux_actlen, xfer->ux_state, 0, 0);
- if (!uhci_active_intr_list(ux))
- return;
-
#ifdef DIAGNOSTIC
if (ux->ux_stdend == NULL) {
printf("uhci_device_isoc_done: xfer=%p stdend==NULL\n", xfer);
@@ -3362,8 +3386,6 @@
sizeof(ux->ux_stdend->td.td_status),
BUS_DMASYNC_PREWRITE | BUS_DMASYNC_PREREAD);
- uhci_del_intr_list(sc, ux); /* remove from active list */
-
offs = 0;
for (i = 0; i < xfer->ux_nframes; i++) {
usb_syncmem(&xfer->ux_dmabuf, offs, xfer->ux_frlengths[i],
@@ -3437,11 +3459,7 @@
BUS_DMASYNC_PREWRITE | BUS_DMASYNC_PREREAD);
}
xfer->ux_status = USBD_IN_PROGRESS;
- /* The ux is already on the examined list, just leave it. */
- } else {
- DPRINTFN(5, "removing", 0, 0, 0, 0);
- if (uhci_active_intr_list(ux))
- uhci_del_intr_list(sc, ux);
+ uhci_add_intr_list(sc, ux);
}
}
@@ -3450,7 +3468,6 @@
uhci_device_ctrl_done(struct usbd_xfer *xfer)
{
uhci_softc_t *sc = UHCI_XFER2SC(xfer);
- struct uhci_xfer *ux = UHCI_XFER2UXFER(xfer);
struct uhci_pipe *upipe = UHCI_PIPE2UPIPE(xfer->ux_pipe);
int len = UGETW(xfer->ux_request.wLength);
int isread = (xfer->ux_request.bmRequestType & UT_READ);
@@ -3461,11 +3478,7 @@
KASSERT(xfer->ux_rqflags & URQ_REQUEST);
- if (!uhci_active_intr_list(ux))
- return;
-
- uhci_del_intr_list(sc, ux); /* remove from active list */
-
+ /* XXXNH move to uhci_idone??? */
if (upipe->pipe.up_dev->ud_speed == USB_SPEED_LOW)
uhci_remove_ls_ctrl(sc, upipe->ctrl.sqh);
else
@@ -3498,11 +3511,6 @@
KASSERT(mutex_owned(&sc->sc_lock));
- if (!uhci_active_intr_list(ux))
- return;
-
- uhci_del_intr_list(sc, ux); /* remove from active list */
-
uhci_remove_bulk(sc, upipe->bulk.sqh);
if (xfer->ux_length) {
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