From: jgchunter@gmail•com (Jon Hunter)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC PATCH] ARM: SOCFPGA: Enable PMU through the CTI
Date: Thu, 13 Jun 2013 17:41:26 +0100 [thread overview]
Message-ID: <51B9F636.5010708@gmail.com> (raw)
In-Reply-To: <20130515091205.GB12907@mudshark.cambridge.arm.com>
On 15/05/13 10:12, Will Deacon wrote:
> Hello,
>
> [adding Jon Hunter]
>
> On Wed, May 15, 2013 at 03:58:02AM +0100, dinguyen at altera.com wrote:
>> From: Dinh Nguyen <dinguyen@altera•com>
>>
>> SOCFPGA has a PMU(Performance Measurement Unit) that has its
>> IRQs routed through Coresight using the CTI(Cross-Trigger Interface).
>>
>> This patch enables the PMU and initializes the CTI for usage by
>> oprofile/perfmon.
>>
>> A lot of the code/idea was taken from this:
>> https://patchwork.kernel.org/patch/1432541/
>>
>> Signed-off-by: Dinh Nguyen <dinguyen@altera•com>
>> CC: Ming Lei <ming.lei@canonical•com>
>> CC: Will Deacon <will.deacon@arm•com>
>> Cc: Paul Walmsley <paul@pwsan•com>
>> Cc: Russell King <linux@arm•linux.org.uk>
>> CC: Arnd Bergmann <arnd@arndb•de>
>> CC: Olof Johansson <olof@lixom•net>
>> Cc: Pavel Machek <pavel@denx•de>
>> ---
>> arch/arm/boot/dts/socfpga.dtsi | 18 +++++
>> arch/arm/include/asm/pmu.h | 3 +
>> arch/arm/kernel/perf_event.c | 16 +++++
>> arch/arm/mach-socfpga/Makefile | 1 +
>> arch/arm/mach-socfpga/socfpga.c | 21 +++++-
>> arch/arm/mach-socfpga/socfpga_cti.c | 125 +++++++++++++++++++++++++++++++++++
>> arch/arm/mach-socfpga/socfpga_cti.h | 16 +++++
>> 7 files changed, 199 insertions(+), 1 deletion(-)
>> create mode 100644 arch/arm/mach-socfpga/socfpga_cti.c
>> create mode 100644 arch/arm/mach-socfpga/socfpga_cti.h
>
> Whilst it's great to see somebody else making use of CTI, I think this would
> benefit from Jon's separate CTI driver that he posted once:
>
> http://lists.infradead.org/pipermail/linux-arm-kernel/2012-December/137156.html
>
> Jon -- would you be interested in reviving that work so the socfpga guys can
> make use of it?
Sorry the delay I have been moving house!
Anyway, although I would be interesting in reviving and completing the
work on cti, realistically, I am not sure when I would get to it now. I
do have the latest code on my github account [1]. However, probably
still needs more work before it is ready for the mainline in sorting out
the DT bindings, etc. I was also thinking about making the cti look like
a interrupt controller in DT as that is the way it is currently being
used. However, I am not implemented that but should not be much work.
Cheers
Jon
[1] https://github.com/jonhunter/linux/commits/dev-cti
next prev parent reply other threads:[~2013-06-13 16:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-15 2:58 [RFC PATCH] ARM: SOCFPGA: Enable PMU through the CTI dinguyen at altera.com
2013-05-15 9:12 ` Will Deacon
2013-06-13 16:41 ` Jon Hunter [this message]
2013-05-15 9:46 ` Pavel Machek
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