Date: Wed, 1 Mar 2000 01:25:28 -0700 From: "Kenneth D. Merry" <ken@kdm.org> To: Mike Smith <msmith@FreeBSD.ORG> Cc: scsi@FreeBSD.ORG Subject: Re: chio trap with not-ready changer Message-ID: <20000301012528.A29274@panzer.kdm.org> In-Reply-To: <200003010803.AAA04730@mass.cdrom.com>; from msmith@FreeBSD.ORG on Wed, Mar 01, 2000 at 12:03:04AM -0800 References: <20000301003828.A28889@panzer.kdm.org> <200003010803.AAA04730@mass.cdrom.com>
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On Wed, Mar 01, 2000 at 00:03:04 -0800, Mike Smith wrote: > > > Looks like it might want a TEST UNIT READY to clear the condition? > > > > Not necessarily a test unit ready, but perhaps something other than mode > > sense or inquiry. > > > > *sigh* > > > > I still don't understand how the retry count is getting decremented. > > I think there's something basic wrong there, yes. Whatever it is also > seems to be inhibiting the TEST UNIT READY that your quirk entry is > trying to send. Maybe, mabye not. It could be that the quirk entry isn't matching for some reason. > > Anyway, try the attached patch to scsi_all.c. It should send one or two > > test unit ready commands to the drive in response to a unit attention. > > > > Hopefully that'll clear the condition, and the mode sense can then succeed. > > > > Just for kicks, try it with the default retry count for the mode sense (in > > chstart()) of 1. > > I tried with both 1 and also 100. With the latter, I get a lot of > repeats, ending in: > > (ch0:ahc0:0:4:0): CAM status = 0x4c, retry count = 1 > (ch0:ahc0:0:4:0): MODE SENSE(06). CDB: 1a 8 1d 0 20 0 > (ch0:ahc0:0:4:0): UNIT ATTENTION asc:29,0 > (ch0:ahc0:0:4:0): Power on, reset, or bus device reset occurred > (ch0:ahc0:0:4:0): CAM status = 0x4c, retry count = 0 > (ch0:ahc0:0:4:0): MODE SENSE(06). CDB: 1a 8 1d 0 20 0 > (ch0:ahc0:0:4:0): UNIT ATTENTION asc:29,0 > (ch0:ahc0:0:4:0): Power on, reset, or bus device reset occurred > (ch0:ahc0:0:4:0): CAM status = 0x4c, retry count = 0 > (ch0:ahc0:0:4:0): MODE SENSE(06). CDB: 1a 0 1d 0 20 0 > (ch0:ahc0:0:4:0): UNIT ATTENTION asc:29,0 > (ch0:ahc0:0:4:0): Power on, reset, or bus device reset occurred > (ch0:ahc0:0:4:0): MODE SENSE(06). CDB: 1a 0 1d 0 20 0 > (ch0:ahc0:0:4:0): UNIT ATTENTION asc:29,0 > (ch0:ahc0:0:4:0): Power on, reset, or bus device reset occurred > (ch0:ahc0:0:4:0): fatal error, failed to attach to device > (ch0:ahc0:0:4:0): lost device > (ch0:ahc0:0:4:0): removing device entry > > (Note two there with a retry count of 0. Weird.) Note that one has the SMS_DBD flag set in the second byte of the CDB, the other has it cleared. > With 1, there's obviously a lot less, but the same result. Can you include a little more of the retries? The disable block descriptors flag is getting cleared mighty late if the above is the tail end of the output from the 100 retries. > Anyway, while this was spewing out, I logged in and issued two > 'camcontrol tur 0:4 -v'. Neither ran until the device was removed, > wherupon we get the same results - the first one fails, the second one > succeeds. Hmm. Not surprising I suppose. > > I haven't tried compiling the patch, hopefully the syntax is correct. > > You missed a semicolon. Oops, sorry. In any case, try putting a printf inside the SS_TUR case in cam_periph_error() in cam_periph.c, to see whether the quirk entry is getting matched correctly and therefore whether the test unit ready is getting issued. I won't be able to debug this more until tomorrow -- time to sleep. :) Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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