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SubjectRe: [PATCH v3 04/10] Documentation: perf: hisi: Documentation for HiP05/06/07 PMU event counting.
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On Tuesday 10 January 2017 11:25 PM, Mark Rutland wrote:
> On Mon, Jan 02, 2017 at 01:49:37AM -0500, Anurup M wrote:
>> +The Hisilicon SoC HiP05/06/07 chips consist of various independent system
>> +device PMU's such as L3 cache(L3C) and Miscellaneous Nodes(MN).
>> +These PMU devices are independent and have hardware logic to gather
>> +statistics and performance information.
>> +
>> +HiP0x chips are encapsulated by multiple CPU and IO die's. The CPU die is
>> +called as Super CPU cluster (SCCL) which includes 16 cpu-cores. Every SCCL
>> +is further grouped as CPU clusters (CCL) which includes 4 cpu-cores each.
>> +Each SCCL has 1 L3 cache and 1 MN units.
> Are there systems with multiple SCCLs? Or is there only one SCCL per
> system?

The HiP0x are encapsulated by multiple SCCL (CPU die) and SICL (IO die).
The HiP06 and HiP07 have two SCCLs.

>> +The L3 cache is shared by all CPU cores in a CPU die. The L3C has four banks
>> +(or instances). Each bank or instance of L3C has Eight 32-bit counter
>> +registers and also event control registers. The HiP05/06 chip L3 cache has
>> +22 statistics events. The HiP07 chip has 66 statistics events. These events
>> +are very useful for debugging.
> Is an L3C associated with a subset of physical memory (as with the ARM
> CCN's L3C), or is it associated with a set of CPUs (e.g. only those in
> a single SCCL) covering all physical memory (as with each CPU's L1 &
> L2)?

Yes the L3C is associated with the set of CPUs in a single SCCL covering
all physical memory.
The L3 cache in all the SCCLs share the complete physical memory.


Thanks,
Anurup

> Thanks,
> Mark.

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