[RFC v2 4/4] powerpc/papr_scm: Add cpu hotplug support for nvdimm pmu device

Aneesh Kumar K.V aneesh.kumar at linux.ibm.com
Wed May 26 18:45:06 AEST 2021

On 5/26/21 12:56 PM, kajoljain wrote:
> On 5/25/21 7:46 PM, Peter Zijlstra wrote:
>> On Tue, May 25, 2021 at 06:52:16PM +0530, Kajol Jain wrote:
>>> Patch here adds cpu hotplug functions to nvdimm pmu.
>> I'm thinking "Patch here" qualifies for "This patch", see
>> Documentation/process/submitting-patches.rst .
> Hi Peter,
>     I will reword this commit message.
>>> It adds cpumask to designate a cpu to make HCALL to
>>> collect the counter data for the nvdimm device and
>>> update ABI documentation accordingly.
>>> Result in power9 lpar system:
>>> command:# cat /sys/devices/nmem0/cpumask
>>> 0
>> Is this specific to the papr thing, or should this be in generic nvdimm
>> code?
> This code is not specific to papr device and we can move it to
> generic nvdimm interface. But do we need to add some checks on whether
> any arch/platform specific driver want that support or we can assume
> that this will be something needed by all platforms?

It says the cpu that should be used to make the hcall. That makes it 
PAPR specific.


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