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Clean up interraction between wdc_reset_channel and the kernel thread. 

Move kill_xfer() after the reset, and stop the DMA engine if needed
(this will unload the DMA maps).
This commit is contained in:
bouyer 2004-08-02 22:02:35 +00:00
parent f5b2286ba1
commit 495631e4d6
3 changed files with 66 additions and 33 deletions
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16
sys/dev/ata/ata.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ata.c,v 1.30 2004/08/01 21:40:41 bouyer Exp $ */
/* $NetBSD: ata.c,v 1.31 2004/08/02 22:02:35 bouyer Exp $ */
/*
* Copyright (c) 1998, 2001 Manuel Bouyer. All rights reserved.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ata.c,v 1.30 2004/08/01 21:40:41 bouyer Exp $");
__KERNEL_RCSID(0, "$NetBSD: ata.c,v 1.31 2004/08/02 22:02:35 bouyer Exp $");
#ifndef WDCDEBUG
#define WDCDEBUG
@ -158,14 +158,12 @@ atabus_thread(void *arg)
break;
s = splbio();
if (chp->ch_flags & WDCF_TH_RESET) {
int drive;
(void) wdcreset(chp, RESET_SLEEP);
for (drive = 0; drive < 2; drive++)
chp->ch_drive[drive].state = 0;
chp->ch_flags &= ~WDCF_TH_RESET;
/*
* wdc_reset_channel() will freeze 2 times, so
* unfreeze one time. Not a problem as we're at splbio
*/
chp->ch_queue->queue_freeze--;
wdcstart(chp);
wdc_reset_channel(chp, AT_WAIT | chp->ch_reset_flags);
} else if ((chp->ch_flags & WDCF_ACTIVE) != 0 &&
chp->ch_queue->queue_freeze == 1) {
/*

78
sys/dev/ic/wdc.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: wdc.c,v 1.183 2004/08/01 21:40:41 bouyer Exp $ */
/* $NetBSD: wdc.c,v 1.184 2004/08/02 22:02:35 bouyer Exp $ */
/*
* Copyright (c) 1998, 2001, 2003 Manuel Bouyer. All rights reserved.
@ -70,7 +70,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: wdc.c,v 1.183 2004/08/01 21:40:41 bouyer Exp $");
__KERNEL_RCSID(0, "$NetBSD: wdc.c,v 1.184 2004/08/02 22:02:35 bouyer Exp $");
#ifndef WDCDEBUG
#define WDCDEBUG
@ -982,18 +982,64 @@ wdc_reset_channel(struct wdc_channel *chp, int flags)
struct ata_xfer *xfer, *next_xfer;
int drive;
chp->ch_queue->queue_freeze++;
/* if we can poll or wait it's OK, otherwise wake up the kernel
* thread
*/
if ((flags & (AT_POLL | AT_WAIT)) == 0) {
if (chp->ch_flags & WDCF_TH_RESET) {
/* no need to schedule a reset more than one time */
return;
}
chp->ch_flags |= WDCF_TH_RESET;
chp->ch_reset_flags = flags & (AT_RST_EMERG | AT_RST_NOCMD);
wakeup(&chp->ch_thread);
return;
}
/* reset the channel */
chp->ch_flags &= ~WDCF_IRQ_WAIT;
if ((flags & AT_WAIT) == 0) {
(void) wdcreset(chp, RESET_POLL);
} else {
(void) wdcreset(chp, RESET_SLEEP);
}
/*
* wait a bit after reset; in case the the DMA engines needs some time
* to recover.
*/
if (flags & AT_WAIT)
tsleep(&flags, PRIBIO, "atardl", 1);
else
delay(1000);
/*
* look for pending xfers. If we have a shared queue, we'll also reset
* the other channel if the current xfer is running on it.
* Then we'll freese the queue, and dequeue only the xfers for this
* channel. xfer->c_kill_xfer() will reset any ATAPI device when
* needed.
* Then we'll dequeue only the xfers for this channel.
* xfer->c_kill_xfer() will reset any ATAPI device when needed.
*/
chp->ch_queue->queue_freeze++;
if ((flags & AT_RST_NOCMD) == 0) {
xfer = TAILQ_FIRST(&chp->ch_queue->queue_xfer);
if (xfer && xfer->c_chp != chp)
wdc_reset_channel(xfer->c_chp, flags);
if (xfer) {
if (xfer->c_chp != chp)
wdc_reset_channel(xfer->c_chp, flags);
else {
/*
* If we're waiting for DMA, stop the
* DMA engine
*/
if (chp->ch_flags & WDCF_DMA_WAIT) {
(*chp->ch_wdc->dma_finish)(
chp->ch_wdc->dma_arg,
chp->ch_channel,
xfer->c_drive,
1);
chp->ch_flags &= WDCF_DMA_WAIT;
}
}
}
for (xfer = TAILQ_FIRST(&chp->ch_queue->queue_xfer);
xfer != NULL; xfer = next_xfer) {
next_xfer = TAILQ_NEXT(xfer, c_xferchain);
@ -1003,24 +1049,10 @@ wdc_reset_channel(struct wdc_channel *chp, int flags)
xfer->c_kill_xfer(chp, xfer, KILL_RESET);
}
}
chp->ch_flags &= ~(WDCF_IRQ_WAIT|WDCF_DMA_WAIT);
if ((flags & AT_POLL) == 0) {
if (chp->ch_flags & WDCF_TH_RESET) {
/* no need to schedule a reset more than one time */
return;
}
chp->ch_flags |= WDCF_TH_RESET;
wakeup(&chp->ch_thread);
return;
}
if ((flags & AT_WAIT) == 0) {
(void) wdcreset(chp, RESET_POLL);
} else {
(void) wdcreset(chp, RESET_SLEEP);
}
for (drive = 0; drive < 2; drive++) {
chp->ch_drive[drive].state = 0;
}
chp->ch_flags &= ~WDCF_TH_RESET;
if ((flags & AT_RST_EMERG) == 0) {
chp->ch_queue->queue_freeze--;
wdcstart(chp);

5
sys/dev/ic/wdcvar.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: wdcvar.h,v 1.58 2004/08/01 21:40:41 bouyer Exp $ */
/* $NetBSD: wdcvar.h,v 1.59 2004/08/02 22:02:35 bouyer Exp $ */
/*-
* Copyright (c) 1998, 2003 The NetBSD Foundation, Inc.
@ -84,6 +84,9 @@ struct wdc_channel {
u_int8_t ch_status; /* copy of status register */
u_int8_t ch_error; /* copy of error register */
/* for the reset callback */
int ch_reset_flags;
/* per-drive info */
struct ata_drive_datas ch_drive[2];