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Date: Thu, 27 Oct 2005 16:30:07 +0200
From: Jens Axboe <axboe@suse.de>
To: Eugene Crosser <crosser@rol.ru>
Cc: Brett Russ <russb@emc.com>, linux-ide@vger.kernel.org, multiman@rol.ru,
       linux-kernel@vger.kernel.org
Subject: Re: Status of Marvell SATA driver (was Re: Trying latest sata_mv - and getting freeze)
Message-ID: <20051027143006.GR4774@suse.de>
References: <435F8AFF.3030404@rol.ru> <435F9737.3050409@emc.com> <435FA5D8.2090406@rol.ru> <20051027111650.GO4774@suse.de> <4360E3A0.70501@rol.ru>
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On Thu, Oct 27 2005, Eugene Crosser wrote:
> Jens Axboe wrote:
> 
> >>>>My hardware is SMP Supermicro with 6 disks on
> >>>>Marvell MV88SX6081 8-port SATA II PCI-X Controller (rev 03)
> >>>>and the sata_mv.c is version 0.25 dated 22 Oct 2005
> >>>>
> >>>>The thing works with "old" mvsata340 driver, but the "new" kernel with
> >>>>your driver freezes when it starts to probe disks.  Even Magic SysRq
> >>>>does not work.  The last lines I see on screen are like this:
> >>>>
> >>>>sata_mv version 0.25
> >>>>ACPI: PCI Interrupt 0000:02:03.0[A] -> GSI 56 (level, low) -> IRQ 185
> >>>>sata_mv(0000:02:03.0) 32 slots 8 ports unknown mode IRQ via MSI
> >>>>ata1: SATA max UDMA/133 cmd 0x0 ctl 0xF8C22120 bmdma 0x0 irq 185
> >>>>ata2: .... <same things>            0xF8C24120 ...
> >>>>...
> >>>>ata8: .... <same thing>             0xF8C38120 ...
> >>>>ATA: abnormal status 0x80 on port 0xF8C2211C
> >>>>... <five more lines identical to the above>
> >>>>ata1: dev 0 ATA-7, max UDMA/133, 781422768 sectors: LBA48
> >>>>
> >>>>- and at this point it freezes hard.
> >>>>Any suggestions for me?  Any information I can collect to help
> >>>>troubleshooting?
> >>
> >>[...]
> >>
> >>>In the meantime, try turning off SMP and seeing if that makes a
> >>>difference.  There still might be a problem with the spinlocks and if so
> >>>it should go away in uniprocessor mode.
> >>
> >>'nosmp' makes no difference.
> > 
> > 
> > Booting with nosmp isn't enough, you need to compile the kernel with
> > CONFIG_SMP turned off. Otherwise the spinlocks will still be used and
> > could cause a hard hang.
> 
> Yeah, that was it!  It boots with the kernel compiled for UP.
> (did not yet have a chance to check how it works).
> Any chance that somebody competent would fix the driver for SMP?

Try booting with nmi_watchdog=1 with the SMP kernel, that should trigger
a watchdog oops when it hard hangs on the spinlock. Then it should be
trivial to fix.

-- 
Jens Axboe

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