Benjamin Herrenschmidt wrote:
> On Wed, 2005-08-03 at 23:00 +0200, Vivenzio Pagliari wrote:
>
>>>>Yes, exactly same machine and same symptoms.
>>>>i see these messages since a loooong time.
>>>>
>>>>it happens when i copy big files or when i do huge & fast files transfert
>>>>via ftp/scp.
>>>
>>>Both of you are using Apple shipped hard disk or you replaced it ? We
>>>might have to limit the timings to UDMA/4 on these machines it seems...
>>>
>>>Ben
>>
>>Hi,
>>
>>I had that "lost interrupt" another time today:
>>
>>Aug 3 21:51:56 garfield kernel: ide-pmac lost interrupt, \
>> dma status: 8400
>>Aug 3 21:51:56 garfield kernel: hda: lost interrupt
>>Aug 3 21:51:56 garfield kernel: hda: dma_intr: status=0xd0 { Busy }
>>Aug 3 21:51:56 garfield kernel:
>>Aug 3 21:51:56 garfield kernel: ide: failed opcode was: unknown
>>Aug 3 21:51:56 garfield kernel: hda: DMA disabled
>>Aug 3 21:51:56 garfield kernel: ide0: reset: success
>>
>>Just in case that it may be of interest: I had configured my kernel
>>(2.6.12.1) with CONFIG_PREEMPT=y.
>>Several people on the list say that using PREEMPT is a bad idea on
>>on ppc, so I've recompiled the kernel (now using 2.6.12.3) without it.
>>But I guess this will not make any difference here, since I remember to
>>have seen this problem already when I used a kernel from the Debian
>>binary package (where PREEMPT is disabled).
>
>
> Can you try tweaking the driver in drivers/ide/ppc/pmac.c, and put this
> code in #if 0 :
>
> /* Get cable type from device-tree */
> if (pmif->kind == controller_kl_ata4 || pmif->kind == controller_un_ata6
> || pmif->kind == controller_k2_ata6
> || pmif->kind == controller_sh_ata6) {
> char* cable = get_property(np, "cable-type", NULL);
> if (cable && !strncmp(cable, "80-", 3))
> pmif->cable_80 = 1;
> }
> /* G5's seem to have incorrect cable type in device-tree. Let's assume
> * they have a 80 conductor cable, this seem to be always the case
> unless
> * the user mucked around
> */
> if (device_is_compatible(np, "K2-UATA") ||
> device_is_compatible(np, "shasta-ata"))
> pmif->cable_80 = 1;
>
> (That is make sure cable_80 is never set to 1)
>
> That will have the effect of slowing down your interface to U/DMA2. Let me
> know if
> that helps.
>
> Ben.
>
After two days of testing the proposed tweak, I was able to trigger the
lost interrupt message another time. So it didn't help :-(
In addition to the above tweak, I also defined IDE_PMAC_DEBUG in pmac.c.
Then, /var/log/kern.log says (I hope that I catched all of the important
messages concerning /dev/hda):
...
Aug 10 21:38:51 garfield kernel: ide0: Found Apple UniNorth ATA-6 controller, \
bus ID 3, irq 39
Aug 10 21:38:51 garfield kernel: Probing IDE interface ide0...
Aug 10 21:38:51 garfield kernel: hda: Hitachi IC25N040ATMR04-0, ATA DISK drive
Aug 10 21:38:51 garfield kernel: hda: Enabling Ultra DMA 2
Aug 10 21:38:51 garfield kernel: ide0 at 0xe9022000-0xe9022007,0xe9022160 on
irq 39
...
Aug 10 21:38:51 garfield kernel: hda: max request size: 1024KiB
Aug 10 21:38:51 garfield kernel: hda: 78140160 sectors (40007 MB) \
w/1740KiB Cache, CHS=16383/255/63, UDMA(33)
Aug 10 21:38:51 garfield kernel: hda: cache flushes supported
Aug 10 21:38:51 garfield kernel: hda: [mac] hda1 hda2 hda3 hda4 hda5 hda6 hda7
hda8 hda9
...
Aug 10 21:38:58 garfield kernel: hda: Set PIO timing for mode 0, reg: 0x08618a92
...
Aug 10 22:23:31 garfield kernel: ide-pmac lost interrupt, dma status: 8400
Aug 10 22:23:31 garfield kernel: hda: lost interrupt
Aug 10 22:23:31 garfield kernel: hda: dma_intr: status=0xd0 { Busy }
Aug 10 22:23:31 garfield kernel:
Aug 10 22:23:31 garfield kernel: ide: failed opcode was: unknown
Aug 10 22:23:31 garfield kernel: hda: DMA disabled
Aug 10 22:23:31 garfield kernel: ide0: reset: success
...
Aug 10 22:24:20 garfield kernel: hda: Enabling Ultra DMA 2
Tell me, if you need more information or if I could do anything else
to help analysing this problem.
Vivenzio
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