sparc64/141918: [ehci] ehci_interrupt: unrecoverable error, controller halted (sparc64)

[Pyun YongHyeon]

On Mon, Feb 08, 2010 at 03:20:26PM +0100, Hans Petter Selasky wrote:
> On Monday 08 February 2010 10:10:03 Marius Strobl wrote:
> > The following reply was made to PR sparc64/141918; it has been noted by
> >  GNATS.
> > 
> > From: Marius Strobl <marius at alchemy.franken.de>
> > To: linimon at freebsd.org, bug-followup at freebsd.org, bel at orel.ru
> > Cc:
> > Subject: Re: sparc64/141918: [ehci] ehci_interrupt: unrecoverable error,
> >  controller halted (sparc64) Date: Mon, 8 Feb 2010 10:07:42 +0100
> > 
> >  On Mon, Feb 08, 2010 at 07:05:29AM +0000, linimon at freebsd.org wrote:
> >  > hps claims that this may be sparc64-specific.
> > 
> >  As outlined here it's unlikely that this is a problem of the sparc64
> >  bus_dmamap_sync(9):
> 
> Hi,
> 
> 
> >  http://lists.freebsd.org/pipermail/freebsd-sparc64/2009-December/006866.ht
> > ml There are however known problems with usb(4) in this regard, see for
> 
> The issue mentioned above was patched in 9-current some months back. Have you 
> tried 9-current?
> 
> >  http://svn.freebsd.org/viewvc/base?view=revision&revision=203080
> 
> On point about busdma is that you should be able to pass any kernel virtual 
> address to be loaded into DMA. If the kernel virtual address is not correctly 
> aligned, a bounce page must be used, so that surrounding memory is not 
> disturbed. And that is not an USB problem.
> 

Would you elaborate on this? I don't think sparc64 needs bounce
buffer as it uses DVMA. I have no idea how bounce buffer can
address the alignment mismatches unless bounce buffer is created on
certain alignment boundary.