[Qemu-devel] Re: PCI: Fix bus address conversion (was Re: commit rules for common git tree)

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Jan 04, 2010 at 07:04:38PM +0000, Blue Swirl wrote:
> On Mon, Jan 4, 2010 at 6:33 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
> >> On Sun, Dec 27, 2009 at 05:01:38PM -0600, Anthony Liguori wrote:
> >> > Likewise, if you see a patch go in that you think would have benefited
> >> > from being on the list, point it out.  People are reasonable and if you
> >> > have a good suggestion, they'll value your input and be likely to seek
> >> > it out in the future.
> >
> > Here is another patch that would have benefitted from review
> > before commit:
> >
> >> commit cf616802171905a9b6d087a69caa3b978b9cd741
> >> Author: Blue Swirl <blauwirbel@gmail.com>
> >> Date:   Sun Dec 27 20:52:36 2009 +0000
> >>
> >>     PCI: Fix bus address conversion
> >>
> >>     Pass physical addresses to map functions instead of PCI bus addresses.
> >>
> >>     Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
> >
> > and previous related patches.  The issues here that I see are:
> >
> > - IMO mem_base should really be pci_bus_t, as pci address might be
> >  64 bit mapped into 32 bit target
> >
> > - I think pci to pci bridges need mem_base copied from parent to child,
> >  this does not seem to be done?
> >
> > - map functions need to get pci_bus_t (for io), and now they get
> >  a cpu address there. The real fix IMO is moving the mapping
> >  to within pci.c. I think Avi had a patch to do this -
> >  any objections to refreshing it?
> >
> > Blue Swirl, could you comment please?
> 
> The issues you point out (which may well be valid) are not related to
> the change made by the patch and should be addressed by new patches.

Yes, there's no harm in fixing them separately.  The point I was making
is it is better to post patches on list so issues can be pointed out and
discussed without the need to dig through git history.

> IIRC Avi promised to refresh his patch but never delivered. I think
> Paul also wanted that the bus translation would be handled in a more
> generic way (eliminate map functions).

I'd like to eliminate map functions as well. Do you have a link to the original patch
btw?

-- 
MST