Source-Changes-HG archive
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
[src-draft/trunk]: src/sys/dev/usb Remove UGEN_ASLP microoptimization.
details: https://anonhg.NetBSD.org/src-all/rev/ddb21176686b
branches: trunk
changeset: 937307:ddb21176686b
user: Taylor R Campbell <riastradh%NetBSD.org@localhost>
date: Sun Aug 16 00:31:06 2020 +0000
description:
Remove UGEN_ASLP microoptimization.
cv_signal already has this microoptimization.
While here, make the lock cover the relevant things we're issuing
cv_signal about.
diffstat:
sys/dev/usb/ugen.c | 63 +++++++++++++++--------------------------------------
1 files changed, 18 insertions(+), 45 deletions(-)
diffs (192 lines):
diff -r d40f878f19f7 -r ddb21176686b sys/dev/usb/ugen.c
--- a/sys/dev/usb/ugen.c Sat Aug 15 13:49:09 2020 +0000
+++ b/sys/dev/usb/ugen.c Sun Aug 16 00:31:06 2020 +0000
@@ -97,7 +97,6 @@
usb_endpoint_descriptor_t *edesc;
struct usbd_interface *iface;
int state;
-#define UGEN_ASLP 0x02 /* waiting for data */
#define UGEN_SHORT_OK 0x04 /* short xfers are OK */
#define UGEN_BULK_RA 0x08 /* in bulk read-ahead mode */
#define UGEN_BULK_WB 0x10 /* in bulk write-behind mode */
@@ -649,7 +648,6 @@
mutex_exit(&sc->sc_lock);
return EWOULDBLOCK;
}
- sce->state |= UGEN_ASLP;
DPRINTFN(5, ("ugenread: sleep on %p\n", sce));
/* "ugenri" */
error = cv_timedwait_sig(&sce->cv, &sc->sc_lock,
@@ -657,10 +655,8 @@
DPRINTFN(5, ("ugenread: woke, error=%d\n", error));
if (sc->sc_dying)
error = EIO;
- if (error) {
- sce->state &= ~UGEN_ASLP;
+ if (error)
break;
- }
}
mutex_exit(&sc->sc_lock);
@@ -693,7 +689,6 @@
}
while (uio->uio_resid > 0 && !error) {
while (sce->ra_wb_used == 0) {
- sce->state |= UGEN_ASLP;
DPRINTFN(5,
("ugenread: sleep on %p\n",
sce));
@@ -705,10 +700,8 @@
error));
if (sc->sc_dying)
error = EIO;
- if (error) {
- sce->state &= ~UGEN_ASLP;
+ if (error)
break;
- }
}
/* Copy data to the process. */
@@ -786,7 +779,6 @@
mutex_exit(&sc->sc_lock);
return EWOULDBLOCK;
}
- sce->state |= UGEN_ASLP;
/* "ugenri" */
DPRINTFN(5, ("ugenread: sleep on %p\n", sce));
error = cv_timedwait_sig(&sce->cv, &sc->sc_lock,
@@ -794,10 +786,8 @@
DPRINTFN(5, ("ugenread: woke, error=%d\n", error));
if (sc->sc_dying)
error = EIO;
- if (error) {
- sce->state &= ~UGEN_ASLP;
+ if (error)
break;
- }
}
while (sce->cur != sce->fill && uio->uio_resid > 0 && !error) {
@@ -895,7 +885,6 @@
while (uio->uio_resid > 0 && !error) {
while (sce->ra_wb_used ==
sce->limit - sce->ibuf) {
- sce->state |= UGEN_ASLP;
DPRINTFN(5,
("ugenwrite: sleep on %p\n",
sce));
@@ -907,10 +896,8 @@
error));
if (sc->sc_dying)
error = EIO;
- if (error) {
- sce->state &= ~UGEN_ASLP;
+ if (error)
break;
- }
}
/* Copy data from the process. */
@@ -1136,14 +1123,9 @@
DPRINTFN(5, (" data = %02x %02x %02x\n",
ibuf[0], ibuf[1], ibuf[2]));
+ mutex_enter(&sc->sc_lock);
(void)b_to_q(ibuf, count, &sce->q);
-
- mutex_enter(&sc->sc_lock);
- if (sce->state & UGEN_ASLP) {
- sce->state &= ~UGEN_ASLP;
- DPRINTFN(5, ("ugen_intr: waking %p\n", sce));
- cv_signal(&sce->cv);
- }
+ cv_signal(&sce->cv);
mutex_exit(&sc->sc_lock);
selnotify(&sce->rsel, 0, 0);
}
@@ -1166,10 +1148,12 @@
DPRINTFN(5,("ugen_isoc_rintr: xfer %ld, count=%d\n",
(long)(req - sce->isoreqs), count));
+ mutex_enter(&sc->sc_lock);
+
/* throw away oldest input if the buffer is full */
- if(sce->fill < sce->cur && sce->cur <= sce->fill + count) {
+ if (sce->fill < sce->cur && sce->cur <= sce->fill + count) {
sce->cur += count;
- if(sce->cur >= sce->limit)
+ if (sce->cur >= sce->limit)
sce->cur = sce->ibuf + (sce->limit - sce->cur);
DPRINTFN(5, ("ugen_isoc_rintr: throwing away %d bytes\n",
count));
@@ -1188,7 +1172,7 @@
tbuf += n;
actlen -= n;
sce->fill += n;
- if(sce->fill == sce->limit)
+ if (sce->fill == sce->limit)
sce->fill = sce->ibuf;
}
@@ -1200,12 +1184,7 @@
ugen_isoc_rintr);
(void)usbd_transfer(xfer);
- mutex_enter(&sc->sc_lock);
- if (sce->state & UGEN_ASLP) {
- sce->state &= ~UGEN_ASLP;
- DPRINTFN(5, ("ugen_isoc_rintr: waking %p\n", sce));
- cv_signal(&sce->cv);
- }
+ cv_signal(&sce->cv);
mutex_exit(&sc->sc_lock);
selnotify(&sce->rsel, 0, 0);
}
@@ -1234,6 +1213,8 @@
usbd_get_xfer_status(xfer, NULL, NULL, &count, NULL);
+ mutex_enter(&sc->sc_lock);
+
/* Keep track of how much is in the buffer. */
sce->ra_wb_used += count;
@@ -1269,12 +1250,7 @@
else
sce->state |= UGEN_RA_WB_STOP;
- mutex_enter(&sc->sc_lock);
- if (sce->state & UGEN_ASLP) {
- sce->state &= ~UGEN_ASLP;
- DPRINTFN(5, ("ugen_bulkra_intr: waking %p\n", sce));
- cv_signal(&sce->cv);
- }
+ cv_signal(&sce->cv);
mutex_exit(&sc->sc_lock);
selnotify(&sce->rsel, 0, 0);
}
@@ -1303,6 +1279,8 @@
usbd_get_xfer_status(xfer, NULL, NULL, &count, NULL);
+ mutex_enter(&sc->sc_lock);
+
/* Keep track of how much is in the buffer. */
sce->ra_wb_used -= count;
@@ -1337,12 +1315,7 @@
else
sce->state |= UGEN_RA_WB_STOP;
- mutex_enter(&sc->sc_lock);
- if (sce->state & UGEN_ASLP) {
- sce->state &= ~UGEN_ASLP;
- DPRINTFN(5, ("ugen_bulkwb_intr: waking %p\n", sce));
- cv_signal(&sce->cv);
- }
+ cv_signal(&sce->cv);
mutex_exit(&sc->sc_lock);
selnotify(&sce->rsel, 0, 0);
}
Home |
Main Index |
Thread Index |
Old Index