Date: Mon, 18 Jul 2011 14:25:20 -0700 From: YongHyeon PYUN <pyunyh@gmail.com> To: Scott Long <scottl@samsco.org> Cc: markmc@dataabstractsolutions.com, "freebsd-stable@freebsd.org Stable" <freebsd-stable@freebsd.org>, John Baldwin <jhb@freebsd.org> Subject: Re: disable 64-bit dma for one PCI slot only? Message-ID: <20110718212520.GB5063@michelle.cdnetworks.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 Mon, Jul 18, 2011 at 03:06:40PM -0600, Scott Long wrote: > On Jul 18, 2011, at 12:02 PM, John Baldwin wrote: > > On Friday, July 15, 2011 6:07:31 pm Mark McConnell wrote: > >> Dear folks, > >> > >> I have two LSI raid cards, one of which (SCSI 320-I) supports > >> 64-bit DMA when 4GB+ of DDR is present and another which > >> does not (SATA 150-D) . Consquently I've disabled 64-bit > >> addressing for amr devices. > >> > >> 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? > +1 > Scott
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