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

[Hans Petter Selasky]

On Monday 08 February 2010 19:05:49 Pyun YongHyeon wrote:
> 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.

If you put the data in a bounce buffer, you can clear data before and after 
the actual data without caring too much about it.

--HPS