From: Suzuki.Poulose@arm•com (Suzuki K. Poulose)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCHv3 0/5] arm-cci400: PMU monitoring support on ARM64
Date: Tue, 10 Mar 2015 16:11:15 +0000 [thread overview]
Message-ID: <54FF17A3.5040404@arm.com> (raw)
In-Reply-To: <alpine.LFD.2.11.1503101205400.25484@knanqh.ubzr>
On 10/03/15 16:09, Nicolas Pitre wrote:
> On Tue, 10 Mar 2015, Suzuki K. Poulose wrote:
>
>> From: "Suzuki K. Poulose" <suzuki.poulose@arm•com>
>>
>> This series enables the PMU monitoring support for CCI400 on ARM64.
>> The existing CCI400 driver code is a mix of PMU driver and the MCPM
>> driver code. The MCPM driver is only used on ARM(32) and contains
>> arm32 assembly and hence can't be built on ARM64. This patch splits
>> the code to
>>
>> - ARM_CCI400_PORT_CTRL driver - depends on ARM && V7
>> - ARM_CCI400_PMU driver
>>
>> Accessing the Peripheral ID2 register(PID2) on CCI-400, to detect
>> the revision of the chipset, is a secure operation. Hence, it prevents
>> us from running this on non-secure platforms. The issue is overcome by
>> explicitly mentioning the revision number of the CCI PMU in the device tree
>> binding. The device-tree binding has been updated with the new bindings.
>>
>> i.e, arm-cci-400-pmu,r0 => revision 0
>> arm-cci-400-pmu,r1 => revision 1
>> arm-cci-400-pmu => (old) DEPRECATED
>>
>> The old binding has been DEPRECATED and must be used only on ARM32
>> system with secure access. We don't have a reliable dynamic way to detect
>> if the system is running secure. This series tries to use the best safe
>> method by relying on the availability of MCPM(as it was prior to the series).
>> It is upto the MCPM platform driver to decide, if the system is secure before
>> it goes ahead and registers its drivers and pokes the CCI. This series doesn't
>> address/solve the problem of MCPM. I will be happy to use a better approach,
>> if there is any.
>>
>> Tested on (non-secure)TC2 and A53x2.
>
> Would be nice if you could also test it on secure TC2 making sure MCPM
> is still functional.
Sudeep is testing those bits.
>
> For patches 1, 3 and 4, you may add:
>
> Acked-by: Nicolas Pitre <nico@linaro•org>
>
> Patches 2 and 5 are purely PMU stuff and out of my area of expertise.
>
Thanks
Suzuki
next prev parent reply other threads:[~2015-03-10 16:11 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-10 15:18 [PATCHv3 0/5] arm-cci400: PMU monitoring support on ARM64 Suzuki K. Poulose
2015-03-10 15:18 ` [PATCH 1/5] arm-cci: Rearrange code for splitting PMU vs driver code Suzuki K. Poulose
2015-03-10 15:18 ` [PATCH 2/5] arm-cci: Abstract the CCI400 PMU speicific definitions Suzuki K. Poulose
2015-03-17 18:49 ` Will Deacon
2015-03-10 15:18 ` [PATCH 3/5] arm-cci: Get rid of secure transactions for PMU driver Suzuki K. Poulose
2015-03-17 9:51 ` [UPDATED] " Suzuki K. Poulose
2015-03-19 17:25 ` Mark Rutland
2015-03-19 17:32 ` Mark Rutland
2015-03-19 17:38 ` Sudeep Holla
2015-03-19 17:52 ` Suzuki K. Poulose
2015-03-19 17:54 ` Mark Rutland
2015-03-10 15:18 ` [PATCH 4/5] arm-cci: Split the code for PMU vs driver support Suzuki K. Poulose
2015-03-10 16:24 ` Sudeep Holla
2015-03-10 15:18 ` [PATCH 5/5] arm-cci: Fix CCI PMU event validation Suzuki K. Poulose
2015-03-17 18:52 ` Will Deacon
2015-03-10 16:09 ` [PATCHv3 0/5] arm-cci400: PMU monitoring support on ARM64 Nicolas Pitre
2015-03-10 16:11 ` Suzuki K. Poulose [this message]
2015-03-10 16:21 ` Sudeep Holla
2015-03-10 16:24 ` Suzuki K. Poulose
2015-03-11 11:40 ` Punit Agrawal
2015-03-17 18:54 ` Will Deacon
2015-03-18 10:09 ` Suzuki K. Poulose
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