From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: mm: enable L1 prefetch on Cortex-A9
Date: Mon, 15 Jun 2015 12:11:03 +0100 [thread overview]
Message-ID: <20150615111103.GL7557@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1434023550-20147-1-git-send-email-thomas.petazzoni@free-electrons.com>
On Thu, Jun 11, 2015 at 01:52:30PM +0200, Thomas Petazzoni wrote:
> The Cortex-A9 has a L1 prefetch capability documented at
> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0388e/Chdejhgd.html:
>
> The Cortex-A9 data cache implements an automatic prefetcher that
> monitors cache misses done by the processor. This unit can monitor
> and prefetch two independent data streams. It can be activated in
> software using a CP15 Auxiliary Control Register bit. See Auxiliary
> Control Register.
>
> This commit enables this L1 prefetch feature unconditionally on all
> Cortex-A9 by setting bit 2 in the Auxiliary Control CP15
> register. Note that since this bit only exists on Cortex-A9 but not on
> Cortex-A5 or Cortex-R7, we separate the handling of Cortex-A9 from the
> one of those two other cores.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
I'd prefer not to take this until after the next merge window, because I
don't want to deal with conflicts that this may cause with other branches
in my tree.
We're at -rc8 now, only a week away from -final, now is not really the
time to be taking new code into git trees anyway.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2015-06-15 11:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-11 11:52 [PATCH] ARM: mm: enable L1 prefetch on Cortex-A9 Thomas Petazzoni
2015-06-15 10:42 ` Dirk Behme
2015-06-15 14:56 ` Thomas Petazzoni
2015-06-15 11:11 ` Russell King - ARM Linux [this message]
2015-06-15 14:57 ` Thomas Petazzoni
2015-06-15 15:05 ` Russell King - ARM Linux
2015-06-15 15:15 ` Thomas Petazzoni
2015-06-16 13:47 ` Rob Herring
2015-06-16 14:10 ` Thomas Petazzoni
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