Re: Worrisome IDE PIO transfers...
From: Bartlomiej Zolnierkiewicz (B.Zolnierkiewicz_at_elka.pw.edu.pl)
Date: 02/29/04
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To: Richard Zidlicky <rz@linux-m68k.org>, Geert Uytterhoeven <geert@linux-m68k.org> Date: Sun, 29 Feb 2004 21:36:33 +0100
On Sunday 29 of February 2004 20:23, Richard Zidlicky wrote:
> On Sun, Feb 29, 2004 at 09:52:08AM +0100, Geert Uytterhoeven wrote:
> > On Sun, 29 Feb 2004, Bartlomiej Zolnierkiewicz wrote:
> > > On Sunday 29 of February 2004 01:58, Jeff Garzik wrote:
> > > > > I like Alan's idea to use loopback instead of "bswap".
> > > >
> > > > Neat but no more zerocopy that way. I much prefer a
> > > > swap-as-you-go...
> > >
> > > Okay, better solution:
> > >
> > > - on Atari/Q40:
> > > if drive->bswap use insw/outsw instead of swapping variants
> >
> > Yep, that sounds the most logical. Richard?
>
> looks good.
>
> However it appears to fix only part of the problem - we need some
> logic to ensure only disk data is swapped.
> Bswapping WIN_DOWNLOAD_MICROCODE data would not be very
> clever I guess.
Actually drive->bswap should die as I overlooked the fact that we are
_not_ swapping disk data (byteswapped data is used for FS) on Atari/Q40.
Therefore the real solution is to use device-mapper instead of drive->bswap
and on Atari/Q40 use standard insw/outs only if blk_fs_request(drive->rq),
for everything else insw_swapw/outsw_swapw should be used.
Does it make any sense? :)
Bartlomiej
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- Previous message: H. Peter Anvin: "Re: q=5BANNOUNCE=5D_linux-libc-headers?= 2.6.3.0"
- In reply to: Richard Zidlicky: "Re: Worrisome IDE PIO transfers..."
- Next in thread: Matt Mackall: "Re: Worrisome IDE PIO transfers..."
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