From: Nathan Lynch <ntl@pobox.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Olof Johansson <olof@lixom.net>,
LinuxPPC-dev <linuxppc-dev@ozlabs.org>,
Jan-Bernd Themann <themann@de.ibm.com>,
Paul Mackerras <paulus@samba.org>,
Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH v2] Force 4K pages for IO addresses.
Date: Tue, 18 Mar 2008 09:45:12 -0500 [thread overview]
Message-ID: <20080318144511.GQ4712@localdomain> (raw)
In-Reply-To: <1205808221.26869.207.camel@pasglop>
Benjamin Herrenschmidt wrote:
>
> On Mon, 2008-03-17 at 19:34 -0500, Olof Johansson wrote:
> > On Mon, Mar 17, 2008 at 02:54:19PM +1100, Tony Breeds wrote:
> > > Currently HEA requires 4K pages for IO resources. Just set the pages size to
> > > IO to 4K.
> >
> > Well, that's too bad. Why penalize all platforms for it?
> >
> > I.e.: Nack, we use 64K iopages on pa6t and it works well. No need to
> > waste tlb and erat space.
>
> We would have to make that pSeries specific for now I suppose...
>
> We don't have a way to know that there "can" be an EHEA right ? It may
> not be in the device-tree at boot and dynamically added to the
> partition...
The ibm,drc-names property of the root node should have "HEA" strings
in it on systems where EHEA can potentially be present.
next prev parent reply other threads:[~2008-03-18 14:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-17 3:47 [PATCH] Force 4K pages for IO addresses Tony Breeds
2008-03-17 3:54 ` [PATCH v2] " Tony Breeds
2008-03-18 0:34 ` Olof Johansson
2008-03-18 2:43 ` Benjamin Herrenschmidt
2008-03-18 14:45 ` Nathan Lynch [this message]
2008-03-18 20:31 ` Benjamin Herrenschmidt
2008-03-18 21:52 ` Tony Breeds
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