[src/jdolecek-ncq]: src/sys/dev/ata make atastart() schedule as many commands...

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/98f52d826312
branches:  jdolecek-ncq
changeset: 352736:98f52d826312
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Tue Aug 01 21:41:25 2017 +0000

description:
make atastart() schedule as many commands as possible, instead of always
only one; makes it able to pick up pace again after processing non-NCQ command

diffstat:

 sys/dev/ata/ata.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (38 lines):

diff -r aa6a36f43c52 -r 98f52d826312 sys/dev/ata/ata.c
--- a/sys/dev/ata/ata.c Tue Aug 01 21:39:51 2017 +0000
+++ b/sys/dev/ata/ata.c Tue Aug 01 21:41:25 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ata.c,v 1.132.8.23 2017/08/01 21:39:51 jdolecek Exp $  */
+/*     $NetBSD: ata.c,v 1.132.8.24 2017/08/01 21:41:25 jdolecek 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 1.132.8.23 2017/08/01 21:39:51 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ata.c,v 1.132.8.24 2017/08/01 21:41:25 jdolecek Exp $");
 
 #include "opt_ata.h"
 
@@ -1240,6 +1240,7 @@
        splx(spl1);
 #endif /* ATA_DEBUG */
 
+again:
        mutex_enter(&chp->ch_lock);
 
        KASSERT(chq->queue_active <= chq->queue_openings);
@@ -1318,6 +1319,11 @@
         * routine for polled commands.
         */
        xfer->c_start(chp, xfer);
+
+       /* Queue more commands if possible */
+       if (chq->queue_active < chq->queue_openings)
+               goto again;
+
        return;
 
 out: