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From: Jon Mason <jdmason@us.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Olof Johansson <olof@lixom.net>,
	linuxppc-dev@ozlabs.org, paulus@samba.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [2/2] POWERPC: Lower threshold for DART enablement to 1GB, V2
Date: Sat, 15 Apr 2006 08:37:52 -0500	[thread overview]
Message-ID: <20060415133752.GB7712@us.ibm.com> (raw)
In-Reply-To: <1145048275.4223.32.camel@localhost.localdomain>

On Sat, Apr 15, 2006 at 06:57:55AM +1000, Benjamin Herrenschmidt wrote:
> 
> > What I had in mind is an interface that given a PCI bridge will tell
> > you what's the most restrictive DMA mask for a device on that bridge,
> > so that you'll know whether you need to enable the IOMMU for that
> > bridge. I'll even settle for a function that tells you what's the most
> > restrictive DMA mask in the system, period. There's nothing inherently
> > arch specific about this.
> >
> > (and as a side note, the IOMMU we are working on on x86-64 is Calgary,
> > which is actually roughly the same chipset used in some PPC
> > machines...)
> 
> Not sure I ever heard about that... What chipsets ?

The pSeries POWER4 based systems (Regatta) had Calgary, and the 
RS/6000 POWER3 based systems (Condor) had Winnipeg (a precursor to
Calgary, with many of the same features).

Thanks,
Jon

> 
> Ben.
> 
> 
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev

  parent reply	other threads:[~2006-04-15 14:34 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-13  2:05 [PATCH] [1/2] POWERPC: IOMMU support for honoring dma_mask Olof Johansson
2006-04-13  2:28 ` [PATCH] [2/2] POWERPC: Lower threshold for DART enablement to 1GB Olof Johansson
2006-04-13  2:52   ` [PATCH] [2/2] POWERPC: Lower threshold for DART enablement to 1GB, V2 Olof Johansson
2006-04-13  6:40     ` Muli Ben-Yehuda
2006-04-13 10:45       ` Benjamin Herrenschmidt
2006-04-13 16:07         ` Olof Johansson
2006-04-13 17:31           ` Muli Ben-Yehuda
2006-04-13 20:52             ` Benjamin Herrenschmidt
2006-04-14 14:48               ` Muli Ben-Yehuda
2006-04-14 20:57                 ` Benjamin Herrenschmidt
2006-04-15  7:45                   ` Muli Ben-Yehuda
2006-04-15 13:09                     ` Jimi Xenidis
2006-04-15 13:37                   ` Jon Mason [this message]
2006-04-15 20:28                     ` Benjamin Herrenschmidt
2006-04-13 20:51           ` Benjamin Herrenschmidt
2006-04-13 22:27             ` Olof Johansson
2006-04-13 22:38               ` Benjamin Herrenschmidt
2006-04-13 15:57       ` Olof Johansson
2006-04-14 18:55 ` [PATCH] [1/2] POWERPC: IOMMU support for honoring dma_mask Olof Johansson

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