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[src/trunk]: src/sys/dev/ata Back out changes to use a threadpool for now; it...
details: https://anonhg.NetBSD.org/src/rev/1575e714c627
branches: trunk
changeset: 932232:1575e714c627
user: thorpej <thorpej%NetBSD.org@localhost>
date: Sat May 02 19:09:56 2020 +0000
description:
Back out changes to use a threadpool for now; it's causing trouble
for some folks on Thinkpads.
diffstat:
sys/dev/ata/ata.c | 108 +++++++++++++++++++++---------------------------
sys/dev/ata/ata_subr.c | 11 +---
sys/dev/ata/atavar.h | 14 +----
3 files changed, 55 insertions(+), 78 deletions(-)
diffs (285 lines):
diff -r 4b7d06ae614b -r 1575e714c627 sys/dev/ata/ata.c
--- a/sys/dev/ata/ata.c Sat May 02 19:01:08 2020 +0000
+++ b/sys/dev/ata/ata.c Sat May 02 19:09:56 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ata.c,v 1.156 2020/04/25 00:07:27 thorpej Exp $ */
+/* $NetBSD: ata.c,v 1.157 2020/05/02 19:09:56 thorpej Exp $ */
/*
* Copyright (c) 1998, 2001 Manuel Bouyer. All rights reserved.
@@ -25,7 +25,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ata.c,v 1.156 2020/04/25 00:07:27 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ata.c,v 1.157 2020/05/02 19:09:56 thorpej Exp $");
#include "opt_ata.h"
@@ -425,60 +425,47 @@
}
/*
- * atabus_tp_job:
+ * atabus_thread:
*
* Worker thread for the ATA bus.
*/
static void
-atabus_tp_job(struct threadpool_job *j)
+atabus_thread(void *arg)
{
- struct ata_channel *chp =
- container_of(j, struct ata_channel, ch_tp_job);
- struct atabus_softc *sc = device_private(chp->atabus);
+ struct atabus_softc *sc = arg;
+ struct ata_channel *chp = sc->sc_chan;
struct ata_queue *chq = chp->ch_queue;
struct ata_xfer *xfer;
int i, rv;
- /* XXX MPSAFE?? */
- KERNEL_LOCK(1, NULL);
+ ata_channel_lock(chp);
+ KASSERT(ata_is_thread_run(chp));
+
+ /*
+ * Probe the drives. Reset type to indicate to controllers
+ * that can re-probe that all drives must be probed..
+ *
+ * Note: ch_ndrives may be changed during the probe.
+ */
+ KASSERT(chp->ch_ndrives == 0 || chp->ch_drive != NULL);
+ for (i = 0; i < chp->ch_ndrives; i++) {
+ chp->ch_drive[i].drive_flags = 0;
+ chp->ch_drive[i].drive_type = ATA_DRIVET_NONE;
+ }
+ ata_channel_unlock(chp);
+
+ atabusconfig(sc);
ata_channel_lock(chp);
- chp->ch_job_thread = curlwp; /* XXX gross */
-
- /* XXX gross */
- if (__predict_false(!chp->ch_initial_config_done)) {
- /*
- * Probe the drives. Reset type to indicate to controllers
- * that can re-probe that all drives must be probed..
- *
- * Note: ch_ndrives may be changed during the probe.
- */
- KASSERT(chp->ch_ndrives == 0 || chp->ch_drive != NULL);
- for (i = 0; i < chp->ch_ndrives; i++) {
- chp->ch_drive[i].drive_flags = 0;
- chp->ch_drive[i].drive_type = ATA_DRIVET_NONE;
+ for (;;) {
+ if ((chp->ch_flags & (ATACH_TH_RESET | ATACH_TH_DRIVE_RESET
+ | ATACH_TH_RECOVERY | ATACH_SHUTDOWN)) == 0 &&
+ (chq->queue_active == 0 || chq->queue_freeze == 0)) {
+ cv_wait(&chp->ch_thr_idle, &chp->ch_lock);
}
- chp->ch_initial_config_done = true;
- ata_channel_unlock(chp);
- atabusconfig(sc);
- ata_channel_lock(chp);
- }
-
-#define WORK_TO_DO \
- (ATACH_TH_RESCAN | ATACH_TH_RESET | ATACH_TH_DRIVE_RESET | \
- ATACH_TH_RECOVERY)
-
- for (;;) {
if (chp->ch_flags & ATACH_SHUTDOWN) {
break;
}
- if ((chp->ch_flags & WORK_TO_DO) == 0 &&
- (chq->queue_active == 0 || chq->queue_freeze == 0)) {
- break;
- }
-
-#undef WORK_TO_DO
-
if (chp->ch_flags & ATACH_TH_RESCAN) {
chp->ch_flags &= ~ATACH_TH_RESCAN;
ata_channel_unlock(chp);
@@ -547,11 +534,10 @@
ata_channel_lock(chp);
}
}
- chp->ch_job_thread = NULL; /* XXX gross */
- threadpool_job_done(&chp->ch_tp_job);
+ chp->ch_thread = NULL;
+ cv_signal(&chp->ch_thr_idle);
ata_channel_unlock(chp);
-
- KERNEL_UNLOCK_ONE(NULL);
+ kthread_exit(0);
}
bool
@@ -559,7 +545,7 @@
{
KASSERT(mutex_owned(&chp->ch_lock));
- return (chp->ch_job_thread == curlwp && !cpu_intr_p());
+ return (chp->ch_thread == curlwp && !cpu_intr_p());
}
static void
@@ -567,7 +553,7 @@
{
KASSERT(mutex_owned(&chp->ch_lock));
ata_channel_freeze_locked(chp);
- threadpool_schedule_job(chp->ch_tp, &chp->ch_tp_job);
+ cv_signal(&chp->ch_thr_idle);
}
/*
@@ -601,6 +587,7 @@
struct atabus_softc *sc = device_private(self);
struct ata_channel *chp = aux;
struct atabus_initq *initq;
+ int error;
sc->sc_chan = chp;
@@ -621,15 +608,11 @@
mutex_exit(&atabus_qlock);
config_pending_incr(sc->sc_dev);
- /* Initialize our threadpool job. */
- threadpool_job_init(&chp->ch_tp_job, atabus_tp_job,
- &chp->ch_lock, "%s", device_xname(self));
-
- /* ...and run it now to scan the bus. */
- KASSERT(chp->ch_tp != NULL);
- ata_channel_lock(chp);
- threadpool_schedule_job(chp->ch_tp, &chp->ch_tp_job);
- ata_channel_unlock(chp);
+ /* XXX MPSAFE - no KTHREAD_MPSAFE, so protected by KERNEL_LOCK() */
+ if ((error = kthread_create(PRI_NONE, 0, NULL, atabus_thread, sc,
+ &chp->ch_thread, "%s", device_xname(self))) != 0)
+ aprint_error_dev(self,
+ "unable to create kernel thread: error %d\n", error);
if (!pmf_device_register(self, atabus_suspend, atabus_resume))
aprint_error_dev(self, "couldn't establish power handler\n");
@@ -683,10 +666,13 @@
}
}
- /* Cancel any in-progress job and dispose of the threadpool. */
+ /* Shutdown the channel. */
ata_channel_lock(chp);
chp->ch_flags |= ATACH_SHUTDOWN;
- threadpool_cancel_job(chp->ch_tp, &chp->ch_tp_job);
+ while (chp->ch_thread != NULL) {
+ cv_signal(&chp->ch_thr_idle);
+ cv_wait(&chp->ch_thr_idle, &chp->ch_lock);
+ }
ata_channel_unlock(chp);
atabus_free_drives(chp);
@@ -1602,7 +1588,7 @@
ata_channel_freeze_locked(chp);
chp->ch_flags |= type;
- threadpool_schedule_job(chp->ch_tp, &chp->ch_tp_job);
+ cv_signal(&chp->ch_thr_idle);
return;
}
@@ -1668,7 +1654,7 @@
ata_channel_thaw_locked(chp);
/* Signal the thread in case there is an xfer to run */
- threadpool_schedule_job(chp->ch_tp, &chp->ch_tp_job);
+ cv_signal(&chp->ch_thr_idle);
}
int
@@ -2299,7 +2285,7 @@
ata_channel_lock(chp);
chp->ch_flags |= ATACH_TH_RESCAN;
- threadpool_schedule_job(chp->ch_tp, &chp->ch_tp_job);
+ cv_signal(&chp->ch_thr_idle);
ata_channel_unlock(chp);
return 0;
diff -r 4b7d06ae614b -r 1575e714c627 sys/dev/ata/ata_subr.c
--- a/sys/dev/ata/ata_subr.c Sat May 02 19:01:08 2020 +0000
+++ b/sys/dev/ata/ata_subr.c Sat May 02 19:09:56 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ata_subr.c,v 1.10 2020/04/25 00:07:27 thorpej Exp $ */
+/* $NetBSD: ata_subr.c,v 1.11 2020/05/02 19:09:56 thorpej Exp $ */
/*
* Copyright (c) 1998, 2001 Manuel Bouyer. All rights reserved.
@@ -25,7 +25,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ata_subr.c,v 1.10 2020/04/25 00:07:27 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ata_subr.c,v 1.11 2020/05/02 19:09:56 thorpej Exp $");
#include "opt_ata.h"
@@ -195,11 +195,8 @@
void
ata_channel_init(struct ata_channel *chp)
{
- int error __diagused;
-
mutex_init(&chp->ch_lock, MUTEX_DEFAULT, IPL_BIO);
- error = threadpool_get(&chp->ch_tp, PRI_NONE);
- KASSERT(error == 0); /* XXX */
+ cv_init(&chp->ch_thr_idle, "atath");
callout_init(&chp->c_timo_callout, 0); /* XXX MPSAFE */
@@ -223,7 +220,7 @@
mutex_exit(&chp->ch_lock);
mutex_destroy(&chp->ch_lock);
- threadpool_put(chp->ch_tp, PRI_NONE);
+ cv_destroy(&chp->ch_thr_idle);
}
void
diff -r 4b7d06ae614b -r 1575e714c627 sys/dev/ata/atavar.h
--- a/sys/dev/ata/atavar.h Sat May 02 19:01:08 2020 +0000
+++ b/sys/dev/ata/atavar.h Sat May 02 19:09:56 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: atavar.h,v 1.106 2020/04/25 00:07:27 thorpej Exp $ */
+/* $NetBSD: atavar.h,v 1.107 2020/05/02 19:09:56 thorpej Exp $ */
/*
* Copyright (c) 1998, 2001 Manuel Bouyer.
@@ -28,7 +28,6 @@
#define _DEV_ATA_ATAVAR_H_
#include <sys/lock.h>
-#include <sys/threadpool.h>
#include <sys/queue.h>
#include <dev/ata/ataconf.h>
@@ -437,14 +436,9 @@
*/
struct ata_queue *ch_queue;
- /*
- * Threadpool job scheduled whenever we need special work done in
- * thread context.
- */
- struct threadpool *ch_tp;
- struct threadpool_job ch_tp_job;
- bool ch_initial_config_done; /* XXX gross */
- struct lwp *ch_job_thread; /* XXX gross */
+ /* The channel kernel thread */
+ struct lwp *ch_thread;
+ kcondvar_t ch_thr_idle; /* thread waiting for work */
/* Number of sata PMP ports, if any */
int ch_satapmp_nports;
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