Messages in this thread | | | Date | Tue, 19 Dec 2006 19:39:47 -0500 | From | Jeff Garzik <> | Subject | Re: SATA DMA problem (sata_uli) |
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Tejun Heo wrote: > Jeff Garzik wrote: >> Alan wrote: >>>> I tracked it down to one of the drives being forced into PIO4 mode >>>> rather than UDMA mode; dmesg bits: >>>> ata4.00: ATA-7, max UDMA/133, 586072368 sectors: LBA48 NCQ (depth 0/32) >>>> ata4.00: ata4: dev 0 multi count 16 >>>> ata4.00: simplex DMA is claimed by other device, disabling DMA >>> Your ULi controller is reporting that it supports UDMA upon only one >>> channel at a time. The kernel is honouring this information. The older >>> ULi (was ALi) PATA devices report simplex but let you turn it off so >>> see if the following does the trick. Test carefully as always with >>> disk driver >>> changes. >>> >>> (Jeff probably best to check the docs before merging this but I believe >>> it is sane) >>> >>> Signed-off-by: Alan Cox <alan@redhat.com> >> My Uli SATA docs do not appear to cover the bmdma registers :( Only the >> PCI config registers. >> >> But regardless, I think the better fix is to never set ATA_HOST_SIMPLEX >> if ATA_FLAG_NO_LEGACY is set. >> >> None of the SATA controllers I've ever encountered has been simplex. > > Just another data point. The same problem is reported by bug #7590. > > http://bugzilla.kernel.org/show_bug.cgi?id=7590 > > Is somebody brewing a patch?
Not to my knowledge. Did you just volunteer? ;-)
/me runs...
Jeff
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