From: Andi Kleen <andi@firstfloor.org>
To: "Thomas Hellström" <thomas@tungstengraphics.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Dave Airlie <airlied@redhat.com>,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
mingo@redhat.com, arjan@linux.intel.com
Subject: Re: [PATCH] x86: create array based interface to change page attribute
Date: Mon, 31 Mar 2008 10:38:16 +0200 [thread overview]
Message-ID: <20080331083816.GC29105@one.firstfloor.org> (raw)
In-Reply-To: <47F098E8.1050605@tungstengraphics.com>
> Also I think we need to clarify the semantics of the c_p_a
> functionality. Right now both AGP and DRM relies on c_p_a doing an
> explicit cache flush. Otherwise the data won't appear on the device side
> of the aperture.
But surely not in cpa I hope ? Or are you saying you first write data
and then do cpa? If true that would be quite an abuse of CPA
I would say and you should fix it ASAP.
> If we use self-snoop, the AGP and DRM drivers can't rely on this flush
> being performed, and they have to do the flush themselves, and for
They definitely should flush themselves if they want data to reach
the device. That is obviously required any time they reuse a page
too.
-Andi
next prev parent reply other threads:[~2008-03-31 8:34 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-31 5:19 [PATCH] x86: create array based interface to change page attribute Dave Airlie
2008-03-31 6:54 ` Thomas Hellström
2008-03-31 9:33 ` Arjan van de Ven
2008-03-31 11:04 ` Thomas Hellström
2008-03-31 7:25 ` Andi Kleen
2008-03-31 7:55 ` Thomas Hellström
2008-03-31 8:38 ` Andi Kleen [this message]
2008-03-31 9:06 ` Thomas Hellström
2008-03-31 9:18 ` Andi Kleen
2008-03-31 11:10 ` Thomas Hellström
2008-03-31 16:08 ` Arjan van de Ven
2008-03-31 16:41 ` Thomas Hellström
2008-03-31 16:49 ` Arjan van de Ven
2008-03-31 17:26 ` Thomas Hellström
2008-04-01 20:58 ` Arjan van de Ven
2008-04-01 21:29 ` Thomas Hellström
2008-04-01 22:30 ` Arjan van de Ven
2008-04-02 6:30 ` Thomas Hellström
2008-04-02 6:35 ` Arjan van de Ven
2008-04-02 6:59 ` Thomas Hellström
2008-04-02 14:01 ` Arjan van de Ven
2008-04-02 17:57 ` Thomas Hellström
2008-04-07 18:23 ` Jesse Barnes
2008-04-07 19:51 ` Thomas Hellström
2008-04-07 19:59 ` Jesse Barnes
2008-04-07 20:46 ` Thomas Hellström
2008-04-07 20:57 ` Arjan van de Ven
2008-04-08 6:12 ` Thomas Hellström
2008-04-07 21:04 ` Jesse Barnes
2008-04-08 6:21 ` Thomas Hellström
2008-04-08 14:27 ` Jesse Barnes
2008-04-07 20:56 ` Arjan van de Ven
2008-04-07 21:02 ` Jesse Barnes
2008-04-07 21:09 ` Jesse Barnes
2008-03-31 9:56 ` Arjan van de Ven
2008-03-31 11:21 ` Dave Airlie
2008-03-31 11:46 ` Andi Kleen
2008-04-02 1:35 ` Dave Airlie
2008-04-01 18:20 ` Arjan van de Ven
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