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Message-ID: <54FF1AA8.8060102@arm.com>
Date: Tue, 10 Mar 2015 16:24:08 +0000
From: "Suzuki K. Poulose" <Suzuki.Poulose@arm.com>
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To: Sudeep Holla <Sudeep.Holla@arm.com>,
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CC: Nicolas Pitre <nico@linaro.org>,
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        Kukjin Kim <kgene@kernel.org>,
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        Punit Agrawal <Punit.Agrawal@arm.com>,
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        Catalin Marinas <Catalin.Marinas@arm.com>
Subject: Re: [PATCHv3 0/5] arm-cci400: PMU monitoring support on ARM64
References: <1426000735-14375-1-git-send-email-suzuki.poulose@arm.com> <54FF19F5.1020309@arm.com>
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On 10/03/15 16:21, Sudeep Holla wrote:
>
>
> On 10/03/15 15:18, 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.
>>
>
> For the series,
> Tested-by: Sudeep Holla <sudeep.holla@arm.com>
> (Tested on secure TC2 using MCPM)
>
Thank you very much for the testing

Suzuki