Date: Mon, 18 Jul 2011 17:00:02 -0700 From: "Mark McConnell" <markmc@dataabstractsolutions.com> To: freebsd-stable@freebsd.org Cc: John Baldwin <jhb@freebsd.org> Subject: Re: disable 64-bit dma for one PCI slot only? Message-ID: <4E24C902.4460.164669ED@markmc.dataabstractsolutions.com> In-Reply-To: <797CACDE-729E-4F3A-AEFF-531C00C2B83A@samsco.org> References: <4E20BA23.13717.66C6F57@markmcconnell.iinet.com>, <201107181402.12755.jhb@freebsd.org>, <797CACDE-729E-4F3A-AEFF-531C00C2B83A@samsco.org>
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On 18 Jul 2011 at 15:06, Scott Long wrote:
{Re: disable 64-bit dma for one PCI ...}:
> >> I would like to disable 64-bit addressing for the SATA card, but
> >> permit it for the SCSI card. Is this possible?
> >
> > You'd have to hack the driver perhaps to only disable 64-bit DMA for certain
> > PCI IDs. It probably already does this?
> >
>
> The driver already had a table for determining 64bit DMA
> based on the PCI ID. I guess there's a mistake in the
> table for this particular card. I think that changing
> the following line to remove the AMR_ID_DO_SG64 flag
> will fix the problem:
>
> {0x1000, 0x1960, AMR_ID_QUARTZ | AMR_ID_DO_SG64 | AMR_ID_PROBE_SIG},
>
> Actually, what's probably going on is that the driver is
> only looking at the vendor and device id's, and is
> ignoring the subvendor and subdevice id's that would
> give it a better clue on the exact hardware in use.
> Fixing the driver to look at all 64bits of id info (and
> take into account wildcards where needed) would be a
> good project, if anyone is interested.
>
> Btw, I *HATE* the "chip" and "card" identifiers used in
> pciconf. Can we change it to emit the standard
> (sub)vendor/(sub)device terminology?
>
> Scott
Thank you for the discussion, John and Scott. I see
where this change would be made, Scott, and I want to try
it when I have an opportunity.
Mark
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