Re: sata_nv frees DMA memory with different size (possibly a generic libata bug)

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On Wed, 18 Feb 2009 15:25:16 -0500
Chuck Ebbert <cebbert@xxxxxxxxxx> wrote:

> On Tue, 17 Feb 2009 20:22:05 +0900
> FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> wrote:
> 
>  
> > > >>> sata_nv 0000:00:0d.0: DMA-API: device driver frees DMA memory with different
> > > >>> size [device address=0x00000000da031000] [map size=4096 bytes] [unmap
> > > >> That's rather curious. It seems to be saying that the sg length is 
> > > >> different between the map and unmap, but it doesn't look like sata_nv 
> > > >> mucks with that anywhere, and neither does libata core..
> > > > 
> > > > Could the SCSI code have merged two requests?
> > > 
> > > I wouldn't think so.. and if it did it seems like it would have to have 
> > > changed the list after libata got the request somehow..
> > 
> > Does this box uses GART IOMMU?
> 
> I don't think so, but I've asked for the dmesg.

Okay, it _is_ using GART IOMMU:

DMA-API: preallocated 8192 debug entries
DMA-API: debugging enabled by kernel config
PCI-DMA: Disabling AGP.
PCI-DMA: aperture base @ 20000000 size 65536 KB
PCI-DMA: using GART IOMMU.
PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture

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