Date: Tue, 7 Jan 2014 11:11:28 -0700 From: "Justin T. Gibbs" <gibbs@scsiguy.com> To: Ben Laurie <ben@links.org> Cc: freebsd-scsi@freebsd.org Subject: Re: Dropped interrupts Message-ID: <84D23688-DDC6-421E-9D21-3DA646229038@scsiguy.com> In-Reply-To: <CAG5KPzwR5=WNKc5hck8F7CtCtk3mivwYFRFeCJT_zWdnetW=3w@mail.gmail.com> References: <CAG5KPzxUAnORPSyJDrSdBBNE7MBi-dD=M6=E1rMG%2Bc8rn4deUQ@mail.gmail.com> <AE41EB93-26BD-4BD0-9913-7CD0A5B6E1A4@scsiguy.com> <CAG5KPzwR5=WNKc5hck8F7CtCtk3mivwYFRFeCJT_zWdnetW=3w@mail.gmail.com>
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On Jan 7, 2014, at 12:36 AM, Ben Laurie <ben@links.org> wrote:
> Attached.
>=20
> On 7 January 2014 05:46, Justin T. Gibbs <gibbs@scsiguy.com> wrote:
>> On Jan 6, 2014, at 3:01 PM, Ben Laurie <ben@links.org> wrote:
>>=20
>>> Not subscribed to the list, so please cc on replies.
>>>=20
>>> I'm using Bacula with an LTO-2 SCSI drive.
>>>=20
>>> With increasing frequency lately, I've been getting errors like this
>>> from bacula:
>>>=20
>>> backup-sd JobId 13092: Error: block.c:608 Write error at 23:6772 on
>>> device "Ultrium" (/dev/nsa0). ERR=3DOperation not permitted.
>>>=20
>>> Associated with this, I see in dmesg:
>>>=20
>>> ahc0: Recovery Initiated
>>>=20
>>> [a lot of dump info, including=85]
>>=20
>> If you provide the dump info, I may be able to tell you why recovery =
is starting.
>>=20
>> The dmesg information from a boot of the system would be good to have =
too.
>>=20
>> =97
>> Justin
The target is keeping us in command phase for some reason. No parity or =
other
errors are being reported. My guess is that the tape drive does not =
like the command
that was issued for some reason.
Attached are two totally untested/uncompiled changes for you to try out. =
The first
should give more information about the command that timed out so we can =
better
determine if it is well formed. The second is an attempted fix for =
spurious=20
=93Interrupts may not be functioning=94 warnings. Can you attempt to =
replicate this
again with these changes?
Thanks,
Justin
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--- //SpectraBSD/stable/sys/dev/aic7xxx/aic7xxx.c 2012-08-29 22:35:04.000000000 -0600
+++ /usr/home/justing/perforce/SpectraBSD/sys/dev/aic7xxx/aic7xxx.c 2012-08-29 22:35:04.000000000 -0600
@@ -7043,7 +7043,6 @@
u_int saved_scbptr;
int target;
int lun;
- int i;
char channel;
target = SCB_GET_TARGET(ahc, scb);
@@ -7051,15 +7050,9 @@
lun = SCB_GET_LUN(scb);
ahc_print_path(ahc, scb);
- printf("SCB 0x%x - timed out\n", scb->hscb->tag);
- if (scb->sg_count > 0) {
- for (i = 0; i < scb->sg_count; i++) {
- printf("sg[%d] - Addr 0x%x : Length %d\n",
- i,
- scb->sg_list[i].addr,
- scb->sg_list[i].len & AHC_SG_LEN_MASK);
- }
- }
+ printf("Timed out ");
+ ahc_print_scb(scb)
+
if (scb->flags & (SCB_DEVICE_RESET|SCB_ABORT)) {
/*
* Been down this road before.
--- //SpectraBSD/stable/sys/dev/aic7xxx/aic_osm_lib.c 2012-06-29 17:23:35.000000000 -0600
+++ /usr/home/justing/perforce/SpectraBSD/sys/dev/aic7xxx/aic_osm_lib.c 2012-06-29 17:23:35.000000000 -0600
@@ -113,13 +113,14 @@
aic_lock(aic);
for (;;) {
- if (LIST_EMPTY(&aic->timedout_scbs) != 0
- && (aic->flags & AIC_SHUTDOWN_RECOVERY) == 0)
- msleep(aic, &aic->platform_data->mtx, PUSER, "idle", 0);
-
if ((aic->flags & AIC_SHUTDOWN_RECOVERY) != 0)
break;
+ if (LIST_EMPTY(&aic->timedout_scbs) != 0) {
+ msleep(aic, &aic->platform_data->mtx, PUSER, "idle", 0);
+ continue;
+ }
+
aic_recover_commands(aic);
}
aic->platform_data->recovery_thread = NULL;
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