* Re: linux-2.4.28 released
[not found] ` <20041118111235.GA26216@logos.cnet>
@ 2004-11-19 13:48 ` Jeff Garzik
2004-11-19 13:54 ` Alan Cox
0 siblings, 1 reply; 6+ messages in thread
From: Jeff Garzik @ 2004-11-19 13:48 UTC (permalink / raw)
To: Marcelo Tosatti
Cc: Tomita, Haruo, Marcelo Tosatti, linux-kernel, linux-ide, alan
On Thu, Nov 18, 2004 at 09:12:36AM -0200, Marcelo Tosatti wrote:
> On Thu, Nov 18, 2004 at 06:50:03PM +0900, Tomita, Haruo wrote:
> > Hi,
> >
> > It seems that combined mode does not work at linux-2.4.28 about
> > the ata_piix driver of the Intel 82801EB/82801ER SATA controller
> > of Intel 82801EB/82801ER. In using combined mode,
> > I think that the following patches are required. Is this right?
>
> Yes, I think so? Jeff is the man.
>
> I dislike the ____request_resource() hack, it has been rejected and
> Jeff agreed with me here.
The reason ____request_resource() is used for combined mode is to
facilitate libata taking one PCI device, and IDE driver taking another
PCI device. This is done because libata did not support PATA, and so,
could not drive the PATA controller.
Now PATA and ATAPI are working, so we could present the IMO ideal
situation: libata can support combined mode best by supporting both
PATA and SATA controllers, on the ICH5. That way DMA works for both
PATA and SATA (DMA doesn't work for PATA, in split-driver configuration),
and there is no split-driver to worry about.
I think there may need to be some code to prevent the IDE driver from
claiming the legacy ISA ports.
Jeff
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: linux-2.4.28 released
2004-11-19 13:48 ` linux-2.4.28 released Jeff Garzik
@ 2004-11-19 13:54 ` Alan Cox
2004-11-19 14:42 ` Jeff Garzik
0 siblings, 1 reply; 6+ messages in thread
From: Alan Cox @ 2004-11-19 13:54 UTC (permalink / raw)
To: Jeff Garzik
Cc: Marcelo Tosatti, Tomita, Haruo, Marcelo Tosatti, linux-kernel,
linux-ide, alan
On Fri, Nov 19, 2004 at 08:48:32AM -0500, Jeff Garzik wrote:
> PATA and SATA (DMA doesn't work for PATA, in split-driver configuration),
> and there is no split-driver to worry about.
>
> I think there may need to be some code to prevent the IDE driver from
> claiming the legacy ISA ports.
Its called "request_resource". If you want the resource claim it. IDE will
be a good citizen.
Alan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: linux-2.4.28 released
2004-11-19 13:54 ` Alan Cox
@ 2004-11-19 14:42 ` Jeff Garzik
2004-11-21 9:22 ` Geert Uytterhoeven
0 siblings, 1 reply; 6+ messages in thread
From: Jeff Garzik @ 2004-11-19 14:42 UTC (permalink / raw)
To: Alan Cox
Cc: Marcelo Tosatti, Tomita, Haruo, Marcelo Tosatti, linux-kernel,
linux-ide
Alan Cox wrote:
> On Fri, Nov 19, 2004 at 08:48:32AM -0500, Jeff Garzik wrote:
>
>>PATA and SATA (DMA doesn't work for PATA, in split-driver configuration),
>>and there is no split-driver to worry about.
>>
>>I think there may need to be some code to prevent the IDE driver from
>>claiming the legacy ISA ports.
>
>
> Its called "request_resource". If you want the resource claim it. IDE will
> be a good citizen.
That's what the quirk does. libata still needs to find out who obtained
the resource, not blindly grab it (and fail).
Jeff
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: linux-2.4.28 released
2004-11-19 14:42 ` Jeff Garzik
@ 2004-11-21 9:22 ` Geert Uytterhoeven
0 siblings, 0 replies; 6+ messages in thread
From: Geert Uytterhoeven @ 2004-11-21 9:22 UTC (permalink / raw)
To: Jeff Garzik
Cc: Alan Cox, Marcelo Tosatti, Tomita, Haruo, Marcelo Tosatti,
Linux Kernel Development, linux-ide
On Fri, 19 Nov 2004, Jeff Garzik wrote:
> Alan Cox wrote:
> > On Fri, Nov 19, 2004 at 08:48:32AM -0500, Jeff Garzik wrote:
> > > PATA and SATA (DMA doesn't work for PATA, in split-driver configuration),
> > > and there is no split-driver to worry about.
> > >
> > > I think there may need to be some code to prevent the IDE driver from
> > > claiming the legacy ISA ports.
> >
> > Its called "request_resource". If you want the resource claim it. IDE will
> > be a good citizen.
>
> That's what the quirk does. libata still needs to find out who obtained the
> resource, not blindly grab it (and fail).
If libata would be initialized before IDE, it could grab the resource during
probing.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: linux-2.4.28 released
@ 2004-11-24 8:57 Tomita, Haruo
2004-11-24 20:08 ` Jeff Garzik
0 siblings, 1 reply; 6+ messages in thread
From: Tomita, Haruo @ 2004-11-24 8:57 UTC (permalink / raw)
To: Jeff Garzik, Alan Cox
Cc: Marcelo Tosatti, Marcelo Tosatti, linux-kernel, linux-ide,
Tomita, Haruo
Sorry for not writing you soon.
Jeff Garzik wrote:
> >>PATA and SATA (DMA doesn't work for PATA, in split-driver
> configuration),
> >>and there is no split-driver to worry about.
> >>
> >>I think there may need to be some code to prevent the IDE
> driver from
> >>claiming the legacy ISA ports.
> >
> >
> > Its called "request_resource". If you want the resource
> claim it. IDE will
> > be a good citizen.
>
> That's what the quirk does. libata still needs to find out
> who obtained the resource, not blindly grab it (and fail).
I also think so.
It may be unavoidable one that ata_piix does not work.
But, it is a problem that a DMA transfer does not enable by piix.
Don't you think so?
--
Haruo
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: linux-2.4.28 released
2004-11-24 8:57 Tomita, Haruo
@ 2004-11-24 20:08 ` Jeff Garzik
0 siblings, 0 replies; 6+ messages in thread
From: Jeff Garzik @ 2004-11-24 20:08 UTC (permalink / raw)
To: Tomita, Haruo
Cc: Alan Cox, Marcelo Tosatti, Marcelo Tosatti, linux-kernel,
linux-ide
Tomita, Haruo wrote:
> It may be unavoidable one that ata_piix does not work.
> But, it is a problem that a DMA transfer does not enable by piix.
> Don't you think so?
This is unavoidable. Two drivers grabbing the same PCI I/O range is
dangerous.
Now that libata supports PATA, it would be easier to let libata support
both SATA and PATA. Since that is a single driver, it makes DMA easy to
support for both SATA/PATA.
If libata does this, there needs to be a "ide=disable" or
"legacy_ide=libata" switch added somewhere, for the cases (most distros)
where IDE driver is built-in.
Jeff
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2004-11-24 20:08 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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[not found] ` <20041118111235.GA26216@logos.cnet>
2004-11-19 13:48 ` linux-2.4.28 released Jeff Garzik
2004-11-19 13:54 ` Alan Cox
2004-11-19 14:42 ` Jeff Garzik
2004-11-21 9:22 ` Geert Uytterhoeven
2004-11-24 8:57 Tomita, Haruo
2004-11-24 20:08 ` Jeff Garzik
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