[RFC PATCH 4/4] arm64:numa: adding numa support for arm64 platforms.

[gpkulkarni@gmail.com (Ganapatrao Kulkarni)]

Hi Hanjun,

On Tue, Oct 28, 2014 at 2:18 PM, Hanjun Guo <hanjun.guo@linaro.org> wrote:
> Hi Ganapatrao,
>
> On 2014-10-18 1:19, Ganapatrao Kulkarni wrote:
> [...]
>> Below is the example for the proposal of numa bindings in DT.
>> This covers cpu to node mapping, memory ranges to node mapping.
>> Also defines proximity distance matrix of nodes to each other.
>> please let me know your comments to go ahead with the implementation.
>>
>> numa-map{
>>          /*  Address cells used for memory range base address in mem-map.
>>              For all others, size-cells is used.
>>              Node-count tells the number of numa nodes in the system.
>>          */
>>          #address-cells = <2>;
>>          #size-cells = <1>;
>>          #node-count = <4>;
>>
>>          /* Memmap for memory ranges on each node>
>>
>>          mem-map = <0x0   0x00c00000 0>,
>>            <0x1   0x00000000 1>,
>>            <0x100 0x00000000 2>,
>>            <0x200 0x00000000 3>;
>>
>>          /* CPU to node map for 4 NODE and 16 CPUs system
>>         < first-cpu last-cpu  node belongs>
>
> What's the property for the cpu? MPIDR of this CPU?
I see in ACPI spec, there is mapping between logical cpu number to
physical id(using MPIDR) using GICC Affinity Structure
Here i am defining mapping between the logical CPUs and the node it belongs.
SMP initialization uses CPU node property of DT to bring them up. We
can get physical id using cpu_logical_map(cpu), which is MPIDR
Do you see any need to expand cpu-map here to have the mapping between
physical cpu id and logical cpu id?
>
>>          */
>>          cpu-map = <0 3 0>,
>>                          <4 7 1>,
>>                         <8 11 2>,
>>                         <12 16 3>;
>>
>
> Thanks
> Hanjun
>
>
thanks
ganapat
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