From: David Gibson <david@gibson.dropbear.id.au>
To: Matt Porter <porter@cox.net>
Cc: Paul Mackerras <paulus@samba.org>, linuxppc-embedded@lists.linuxppc.org
Subject: Re: More details on the telnet with CONFIG_PIN_TLB problems
Date: Wed, 5 Jun 2002 10:02:39 +1000 [thread overview]
Message-ID: <20020605000239.GA17752@zax> (raw)
In-Reply-To: <20020604095720.A15252@home.com>
On Tue, Jun 04, 2002 at 09:57:20AM -0700, Matt Porter wrote:
>
> On Tue, Jun 04, 2002 at 10:54:51PM +1000, Paul Mackerras wrote:
> >
> > Looks like Ben and I have found the problem; Ben added an isync and a
> > sync to set_context() after setting the PID register and that seems to
> > have fixed it. It makes sense, as isync invalidates the shadow DTLB
> > and ITLB. (The sync may be unnecessary.)
>
> Makes sense, I was telling some folks at work that it had to be a
> 40x specific code problem. The 440 has had an isync in set_context()
> and doesn't see this problem (and by default uses pinned TLBs).
Heh, well not only uses them by default, but must use them since
translation is always on.
> Changing the PID is a context changing event that requires a context
> synchronization. The sync shouldn't be necessary per the UM and
> seems to be true in practice from my 440 testing.
--
David Gibson | For every complex problem there is a
david@gibson.dropbear.id.au | solution which is simple, neat and
| wrong. -- H.L. Mencken
http://www.ozlabs.org/people/dgibson
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-06-05 0:02 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-03 7:53 More details on the telnet with CONFIG_PIN_TLB problems David Gibson
2002-06-04 12:54 ` Paul Mackerras
2002-06-04 14:39 ` David Gibson
2002-06-04 16:57 ` Matt Porter
2002-06-05 0:02 ` David Gibson [this message]
2002-06-05 0:34 ` Matt Porter
2002-06-04 17:04 ` Dan Malek
2002-06-04 16:43 ` Benjamin Herrenschmidt
2002-06-05 3:22 ` David Gibson
2002-06-04 19:31 ` benh
2002-06-06 1:42 ` David Gibson
2002-06-05 22:15 ` Benjamin Herrenschmidt
2002-06-06 7:52 ` David Gibson
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