From: Phil Sutter <phil@nwl.cc>
To: linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org,
ne@erfurth.eu, Johann Baudy <johann.baudy@gnu-log.net>,
Lennert Buytenhek <kernel@wantstofly.org>,
Nicolas Pitre <nico@fl
Subject: Re: ARM, AF_PACKET: caching problems on Marvell Kirkwood
Date: Wed, 25 May 2011 12:32:30 +0200 [thread overview]
Message-ID: <20110525103230.GA6057@orbit.nwl.cc> (raw)
In-Reply-To: <20110506161753.GC20777@orbit.nwl.cc>
Hi,
On Fri, May 06, 2011 at 06:17:53PM +0200, Phil Sutter wrote:
> On Thu, May 05, 2011 at 09:46:01PM +0200, Andrew Lunn wrote:
> > I can reproduce it on a Kirkwood:
> >
> > [ 0.000000] CPU: Feroceon 88FR131 [56251311] revision 1 (ARMv5TE), cr=00053977
>
> Thanks for the information. Seems like we have the same CPU:
>
> | [ 0.000000] CPU: Feroceon 88FR131 [56251311] revision 1 (ARMv5TE), cr=00053177
> | [ 0.000000] CPU: VIVT data cache, VIVT instruction cache
>
> and it's actually VIVT, not VIPT as I wrote in an earlier mail.
I have been looking at flush_dcache_page(), which is supposed to do the
trick when caches need to be flushed/dropped for the mmapped memory.
Interestingly, there seems to be no page mapping - so page_mapping(page)
returns NULL and therefore __flush_dcache_aliases(mapping, page) is
never being called.
Could that be the culprit here? I guess there should always be a mapping
present for mmapped pages, right?
Greetings, Phil
WARNING: multiple messages have this Message-ID (diff)
From: phil@nwl.cc (Phil Sutter)
To: linux-arm-kernel@lists.infradead.org
Subject: ARM, AF_PACKET: caching problems on Marvell Kirkwood
Date: Wed, 25 May 2011 12:32:30 +0200 [thread overview]
Message-ID: <20110525103230.GA6057@orbit.nwl.cc> (raw)
In-Reply-To: <20110506161753.GC20777@orbit.nwl.cc>
Hi,
On Fri, May 06, 2011 at 06:17:53PM +0200, Phil Sutter wrote:
> On Thu, May 05, 2011 at 09:46:01PM +0200, Andrew Lunn wrote:
> > I can reproduce it on a Kirkwood:
> >
> > [ 0.000000] CPU: Feroceon 88FR131 [56251311] revision 1 (ARMv5TE), cr=00053977
>
> Thanks for the information. Seems like we have the same CPU:
>
> | [ 0.000000] CPU: Feroceon 88FR131 [56251311] revision 1 (ARMv5TE), cr=00053177
> | [ 0.000000] CPU: VIVT data cache, VIVT instruction cache
>
> and it's actually VIVT, not VIPT as I wrote in an earlier mail.
I have been looking at flush_dcache_page(), which is supposed to do the
trick when caches need to be flushed/dropped for the mmapped memory.
Interestingly, there seems to be no page mapping - so page_mapping(page)
returns NULL and therefore __flush_dcache_aliases(mapping, page) is
never being called.
Could that be the culprit here? I guess there should always be a mapping
present for mmapped pages, right?
Greetings, Phil
next prev parent reply other threads:[~2011-05-25 10:32 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-08 13:06 ARM, AF_PACKET: caching problems on Marvell Kirkwood Phil Sutter
2011-04-08 13:06 ` Phil Sutter
2011-05-05 14:11 ` Phil Sutter
2011-05-05 14:11 ` Phil Sutter
2011-05-05 14:56 ` Eric Dumazet
2011-05-05 14:56 ` Eric Dumazet
2011-05-06 16:12 ` Phil Sutter
2011-05-06 16:12 ` Phil Sutter
2011-05-05 19:46 ` Andrew Lunn
2011-05-05 19:46 ` Andrew Lunn
2011-05-06 16:17 ` Phil Sutter
2011-05-06 16:17 ` Phil Sutter
2011-05-09 8:59 ` Phil Sutter
2011-05-09 8:59 ` Phil Sutter
2011-05-25 10:32 ` Phil Sutter [this message]
2011-05-25 10:32 ` Phil Sutter
2011-09-02 11:08 ` [PATCH] af_packet: flush complete kernel cache in packet_sendmsg Phil Sutter
2011-09-02 11:08 ` Phil Sutter
2011-09-02 13:46 ` Ben Hutchings
2011-09-02 13:46 ` Ben Hutchings
2011-09-02 13:59 ` Phil Sutter
2011-09-02 13:59 ` Phil Sutter
2011-09-02 17:28 ` Russell King - ARM Linux
2011-09-02 17:28 ` Russell King - ARM Linux
2011-09-05 19:57 ` Phil Sutter
2011-09-05 19:57 ` Phil Sutter
2011-09-06 9:57 ` Russell King - ARM Linux
2011-09-06 9:57 ` Russell King - ARM Linux
2011-09-06 11:05 ` Phil Sutter
2011-09-06 11:05 ` Phil Sutter
[not found] ` <D3F292ADF945FB49B35E96C94C2061B90A239361@nsmail.netscout.com>
2011-09-02 14:00 ` FW: " chetan loke
2011-09-02 14:00 ` chetan loke
2011-09-02 15:31 ` Phil Sutter
2011-09-02 15:31 ` Phil Sutter
2011-09-02 16:49 ` chetan loke
2011-09-02 16:49 ` chetan loke
2011-09-06 9:44 ` Phil Sutter
2011-09-06 9:44 ` Phil Sutter
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