From: "Michael Chan" <mchan@broadcom.com>
To: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
Cc: "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Anton Blanchard" <anton@samba.org>,
"Paul Mackerras" <paulus@samba.org>
Subject: Re: [TG3]: Add DMA address workaround
Date: Tue, 07 Mar 2006 14:18:58 -0800 [thread overview]
Message-ID: <1141769938.8146.19.camel@rh4> (raw)
In-Reply-To: <1141773668.11221.110.camel@localhost.localdomain>
On Wed, 2006-03-08 at 10:21 +1100, Benjamin Herrenschmidt wrote:
>
> I suppose that means I need to update the ppc64 iommu code to actually
> honor the DMA mask when allocating ;) That will be easy for "dumb"
> iommu's like the G5 but might be a bit more tricky with pSeries.
>
> Anton, Paul, we have no control on the DMA ranges allocated to each phb
> in the system, do we know if they go beyond 32 bits ? (And if yes,
> beyond 40 bits)
>
So how does powerpc handle 32-bit PCI devices that don't support dual
address cycles? Such devices will set the dma_mask to 32-bit. Shouldn't
40-bit be handled in a similar way?
next prev parent reply other threads:[~2006-03-07 23:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200603071900.k27J0YSP023014@hera.kernel.org>
2006-03-07 23:21 ` [TG3]: Add DMA address workaround Benjamin Herrenschmidt
2006-03-07 22:18 ` Michael Chan [this message]
2006-03-08 0:28 ` Benjamin Herrenschmidt
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