From: Stephen Boyd <sboyd@codeaurora.org>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Mark Rutland <mark.rutland@arm.com>,
Russell King <linux@arm.linux.org.uk>
Subject: Re: [PATCH v4 3/6] ARM: Add Krait L2 accessor functions
Date: Tue, 07 Jan 2014 15:09:59 -0800 [thread overview]
Message-ID: <52CC8947.7020900@codeaurora.org> (raw)
In-Reply-To: <20140107230725.GG4164@pd.tnic>
On 01/07/14 15:07, Borislav Petkov wrote:
> On Mon, Dec 30, 2013 at 12:14:14PM -0800, Stephen Boyd wrote:
>> Krait CPUs have a handful of L2 cache controller registers that
>> live behind a cp15 based indirection register. First you program
>> the indirection register (l2cpselr) to point the L2 'window'
>> register (l2cpdr) at what you want to read/write. Then you
>> read/write the 'window' register to do what you want. The
>> l2cpselr register is not banked per-cpu so we must lock around
>> accesses to it to prevent other CPUs from re-pointing l2cpdr
>> underneath us.
>>
>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Cc: Russell King <linux@arm.linux.org.uk>
>> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
>> ---
>> arch/arm/common/Kconfig | 3 ++
>> arch/arm/common/Makefile | 1 +
>> arch/arm/common/krait-l2-accessors.c | 58 +++++++++++++++++++++++++++++++
>> arch/arm/include/asm/krait-l2-accessors.h | 20 +++++++++++
> I'm no ARM guy but out of curiosity, why is this code not part of the
> krait edac driver? IOW, is there a compelling reason for it to be in
> arch/arm/common/?
This is used for more than just the edac driver. In the future, we'll
need this for the cpufreq driver and the l2 performance monitor driver.
I suppose I could have stated that in the commit text.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
WARNING: multiple messages have this Message-ID (diff)
From: sboyd@codeaurora.org (Stephen Boyd)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 3/6] ARM: Add Krait L2 accessor functions
Date: Tue, 07 Jan 2014 15:09:59 -0800 [thread overview]
Message-ID: <52CC8947.7020900@codeaurora.org> (raw)
In-Reply-To: <20140107230725.GG4164@pd.tnic>
On 01/07/14 15:07, Borislav Petkov wrote:
> On Mon, Dec 30, 2013 at 12:14:14PM -0800, Stephen Boyd wrote:
>> Krait CPUs have a handful of L2 cache controller registers that
>> live behind a cp15 based indirection register. First you program
>> the indirection register (l2cpselr) to point the L2 'window'
>> register (l2cpdr) at what you want to read/write. Then you
>> read/write the 'window' register to do what you want. The
>> l2cpselr register is not banked per-cpu so we must lock around
>> accesses to it to prevent other CPUs from re-pointing l2cpdr
>> underneath us.
>>
>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Cc: Russell King <linux@arm.linux.org.uk>
>> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
>> ---
>> arch/arm/common/Kconfig | 3 ++
>> arch/arm/common/Makefile | 1 +
>> arch/arm/common/krait-l2-accessors.c | 58 +++++++++++++++++++++++++++++++
>> arch/arm/include/asm/krait-l2-accessors.h | 20 +++++++++++
> I'm no ARM guy but out of curiosity, why is this code not part of the
> krait edac driver? IOW, is there a compelling reason for it to be in
> arch/arm/common/?
This is used for more than just the edac driver. In the future, we'll
need this for the cpufreq driver and the l2 performance monitor driver.
I suppose I could have stated that in the commit text.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2014-01-07 23:10 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-30 20:14 [PATCH v4 0/6] Krait L1/L2 EDAC driver Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2013-12-30 20:14 ` [PATCH v4 1/6] edac: Don't try to cancel workqueue when it's never setup Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2014-01-07 17:19 ` Borislav Petkov
2014-01-07 17:19 ` Borislav Petkov
2014-01-07 17:19 ` Borislav Petkov
2013-12-30 20:14 ` [PATCH v4 2/6] genirq: export percpu irq functions for module usage Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2014-01-07 23:02 ` Borislav Petkov
2014-01-07 23:02 ` Borislav Petkov
2013-12-30 20:14 ` [PATCH v4 3/6] ARM: Add Krait L2 accessor functions Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2014-01-07 23:07 ` Borislav Petkov
2014-01-07 23:07 ` Borislav Petkov
2014-01-07 23:09 ` Stephen Boyd [this message]
2014-01-07 23:09 ` Stephen Boyd
2014-01-09 0:53 ` Courtney Cavin
2014-01-09 0:53 ` Courtney Cavin
2014-01-09 0:53 ` Courtney Cavin
2014-01-09 1:54 ` Stephen Boyd
2014-01-09 1:54 ` Stephen Boyd
2014-01-09 1:54 ` Stephen Boyd
2014-01-09 11:03 ` Borislav Petkov
2014-01-09 11:03 ` Borislav Petkov
2014-01-09 11:03 ` Borislav Petkov
[not found] ` <1388434457-4194-1-git-send-email-sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2013-12-30 20:14 ` [PATCH v4 4/6] devicetree: bindings: Document Krait L1/L2 EDAC Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2014-01-07 10:54 ` Lorenzo Pieralisi
2014-01-07 10:54 ` Lorenzo Pieralisi
2014-01-07 10:54 ` Lorenzo Pieralisi
2014-01-07 20:12 ` Stephen Boyd
2014-01-07 20:12 ` Stephen Boyd
2014-01-07 20:12 ` Stephen Boyd
2014-01-08 10:05 ` Lorenzo Pieralisi
2014-01-08 10:05 ` Lorenzo Pieralisi
2014-01-08 10:05 ` Lorenzo Pieralisi
2014-01-09 20:52 ` Stephen Boyd
2014-01-09 20:52 ` Stephen Boyd
2014-01-09 20:52 ` Stephen Boyd
2014-01-10 10:54 ` Lorenzo Pieralisi
2014-01-10 10:54 ` Lorenzo Pieralisi
2014-01-10 10:54 ` Lorenzo Pieralisi
2013-12-30 20:14 ` [PATCH v4 5/6] edac: Add support for Krait CPU cache error detection Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2014-01-07 23:43 ` Borislav Petkov
2014-01-07 23:43 ` Borislav Petkov
2013-12-30 20:14 ` [PATCH v4 6/6] ARM: dts: msm: Add Krait CPU/L2 nodes Stephen Boyd
2013-12-30 20:14 ` Stephen Boyd
2014-01-04 10:19 ` [PATCH v4 0/6] Krait L1/L2 EDAC driver Borislav Petkov
2014-01-04 10:19 ` Borislav Petkov
[not found] ` <20140104101901.GA4439-K5JNixvcfoxupOikMc4+xw@public.gmane.org>
2014-01-06 22:09 ` Stephen Boyd
2014-01-06 22:09 ` Stephen Boyd
2014-01-06 22:09 ` Stephen Boyd
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