On Wed, Mar 01 2006, Jens Axboe wrote:
> On Wed, Mar 01 2006, Andy Chittenden wrote:
>
> Some weird stuff going on here, or I'm confused. Lots of entries are not
> page start aligned, yet they have a length of 4kb. The troublesome
> entries are additionally:
>
> > hda: DMA table too small
> > ide dma table, 256 entries, bounce pfn 1310720
> > sg0: dma=6e9e800, len=4096/0, pfn=1185312
> > sg1: dma=6e9f800, len=4096/0, pfn=1185270
>
> This one, since it'll wrap around and consume two cpu dma table entries.
> Since we are already at the max of 256 already from the beginning,
> there's no way we can split this one.
>
> > sg2: dma=6ea0800, len=4096/0, pfn=1184892
> > sg3: dma=6ea1800, len=4096/0, pfn=1185144
> > sg4: dma=6ea2800, len=4096/0, pfn=1185102
> > sg5: dma=6ea3800, len=4096/0, pfn=1185059
> > sg6: dma=6ea4800, len=4096/0, pfn=1185017
> > sg7: dma=6ea5800, len=4096/0, pfn=1184975
> > sg8: dma=6ea6800, len=4096/0, pfn=1184933
> > sg9: dma=6ea7800, len=4096/0, pfn=1184850
> > sg10: dma=6ea8800, len=4096/0, pfn=1186142
> > sg11: dma=6ea9800, len=4096/0, pfn=1186814
> > sg12: dma=6eaa800, len=4096/0, pfn=1186731
> > sg13: dma=6eab800, len=4096/0, pfn=1186689
> > sg14: dma=6eac800, len=4096/0, pfn=1186227
> > sg15: dma=6ead800, len=4096/0, pfn=1186185
> > sg16: dma=6eae800, len=4096/0, pfn=1186100
> > sg17: dma=6eaf800, len=4096/0, pfn=1185807
>
> Ditto for that one, will also be split into two 2kb entries.
>
> So this first mapping dump shows us that we start with 256 entries, that
> IDE would like to map into 258 entries. The question is why these dma
> address as mapped by pci_map_sg() aren't page aligned? Andi?
Oh, it's dumping ->length but should be dumping ->dma_length in my debug
patch. Can you change that and reproduce again?
--
Jens Axboe
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