From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Steven Scholz <steven.scholz@imc-berlin.de>
Cc: Alan <alan@lxorguk.ukuu.org.uk>, linux-ide@vger.kernel.org
Subject: Re: Impact of no_lba48{_dma} = 1 ?
Date: Wed, 07 Feb 2007 17:09:34 +0300 [thread overview]
Message-ID: <45C9DD9E.3070706@ru.mvista.com> (raw)
In-Reply-To: <45C9DAC7.10701@imc-berlin.de>
Hello.
Steven Scholz wrote:
>>>So rqsize is only needed for DMA accesses?
>>PIO transfers are sector at a time, or multi-sector up to a usual limit
>>of about 16 sectors.
> So again: rqsize does not matter for PIO transfer?
> Looking at the lines
> if (hwif->no_lba48_dma && lba48 && dma) {
> if (block + rq->nr_sectors > 1ULL << 28)
> dma = 0;
> else
> lba48 = 0;
> }
> in drivers/ide/ide-disk.c. Does that mean that 48bit LBA adressing using the
> task_ioreg_t stuff is only used for sector numbers larger 1 << 28?
If you're asking in general, no, that does not follow from that code.
It only takes care of the no_lba48_dma case.
MBR, Sergei
next prev parent reply other threads:[~2007-02-07 14:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-07 9:56 Impact of no_lba48{_dma} = 1 ? Steven Scholz
2007-02-07 11:58 ` Alan
2007-02-07 13:25 ` Steven Scholz
2007-02-07 13:53 ` Alan
2007-02-07 13:49 ` Sergei Shtylyov
2007-02-07 14:11 ` Alan
2007-02-07 14:03 ` Steven Scholz
2007-02-07 14:19 ` Alan
2007-02-07 14:10 ` Sergei Shtylyov
2007-02-07 13:57 ` Steven Scholz
2007-02-07 14:09 ` Sergei Shtylyov [this message]
2007-02-07 14:16 ` Alan
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