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SubjectRe: how to get virtual address from dma address
oops! I am sorry. I did not meant "pci_unmap_single"
pci_unmap_single.

I meant to get a routine which does exactly opposite
of what pci_map_single does, i.e., give me a virtual
address for a dma address.

Some people suggested, bus_to_virt() is not good a
call.

Thanks

--- Kurt Ferreira <kferreir@esscom.com> wrote:
> I have to admit I have not been following this
> thread and I apologize if I
> am stating somethign already stated, but there is a
> call in 2.4 kernels
> called pci_unmap_single. see
> Documentation/DMA-mapping.txt. Now on some
> arch's this call does nothing (for example i386) but
> for some arch's
> (for example alpha's, and others) it does stuff. I
> really would stay
> aways from the virt_to_phys family of calls as has
> been stated.
>
> Hope this helps,
> Kurt
>
>
> On Wed, 3 Oct 2001, Linux Bigot wrote:
>
> > Then why isn't there a call like
> pci_unmap_single()
> >
> >
> > Thanks
> >
> >
> > --- Ben Collins <bcollins@debian.org> wrote:
> > > On Wed, Oct 03, 2001 at 09:37:00AM -0700, Linux
> > > Bigot wrote:
> > > > Please tell me why can't I use bus_to_virt().
> > >
> > > Because bus_to_virt/virt_to_bus is obsolete, and
> > > using it will make your
> > > driver non-portable to some architectures.
> > >
> > > --
> > >
> > >
> >
>
.----------=======-=-======-=========-----------=====------------=-=-----.
> > > / Ben Collins -- Debian
> > > GNU/Linux \
> > > ` bcollins@debian.org --
> bcollins@openldap.org
> > > -- bcollins@linux.com '
> > >
> >
>
`---=========------=======-------------=-=-----=-===-======-------=--=---'
> >
> >
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> --
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>
>


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