[PATCH] arm-cci: Do not enable CCI-400 PMU by default
Suzuki K. Poulose
Suzuki.Poulose at arm.com
Mon May 11 07:19:00 PDT 2015
On 11/05/15 15:07, Russell King - ARM Linux wrote:
> On Mon, May 11, 2015 at 01:50:26PM +0100, Suzuki K. Poulose wrote:
>> config ARM_CCI400_PMU
>> bool "ARM CCI400 PMU support"
>> - default y
>> depends on ARM || ARM64
>> - depends on HW_PERF_EVENTS
>> + depends on PERF_EVENTS
>> select ARM_CCI400_COMMON
>> - Support for PMU events monitoring on the ARM CCI cache coherent
>> - interconnect.
>> - If unsure, say Y
>> + Support for PMU events monitoring on the ARM CCI-400 (cache coherent
>> + interconnect). CCI-400 supports counting events related to the
>> + connected slave/master interfaces.
> This still needs to be better. How do I know whether it should be enabled
> for my platform or not?
> Presumably, we can say that CCI-400 does not appear on CPUs older than X,
> which means we can add "The CCI-400 may be provided on ARM CPUs X or
> I doubt that you'll find CCI-400 on ARMv6 or older ARM architectures for
> example. Maybe then we need "depends on ARM || ARM64" to be tighter?
> "depends on (ARM && CPU_V7) || ARM64" ?
Yes, the CCI-400 could be found only on V7 or later (which could include
32bit only V8) for ARM32.
I can fix that.
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