Re: [Xen-devel] Failure to get memory for GATT table, again

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

On Tue, Feb 01, 2005 at 09:25:33PM -0000, Ian Pratt wrote:
> > >>(file=/mnt/hda3/home/jacobg/xeno-unstable.bk/xen/include/asm/mm.h, 
> > > > >>line=157) Error pfn 0003ff40: ed=fc599260, sd=fc5996a0, 
> > > > caf=80000002, 
> > > > >>taf=f0000001
> > > 
> > > I suspect that sd is actually 'dom_xen', but it would be useful to
> > > verify this.
> > > Also, please print out max_page and post the e820 map for 
> > the machine.
> > 
> > here is the error again, with max_page added:
> > 
> > (XEN) 
> > (file=/mnt/hda3/home/jacobg/xeno-unstable.bk/xen/include/asm/m
> > m.h, line=161) Error pfn 0003ff40: ed=fc599260, sd=fc5996a0, 
> > caf=80000002, taf=f0000001 max_page 0003ff74
> > (XEN)  0000000000100000 - 000000003ff74000 (usable)
> 
> I bet the fglrx driver just does get_free_pages rather than the proper
> dma_alloc_coherent.


hmm, actually it seems the case is that dma_alloc_coherent() falls back to
calling __get_free_pages(), because dev->dma_mem is NULL. When the returned
address gets converted into a bus address, the resulting address seems to be 
within Xen-space :-(

Why is calling __get_free_pages() a problem?

Jacob


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