[PATCH v2 3/8] drivers/perf: hisi: Add new functions for L3C PMU

[Mark Rutland]

On Wed, Feb 03, 2021 at 03:51:03PM +0800, Shaokun Zhang wrote:
> On HiSilicon Hip09 platform, some new functions are enhanced on L3C PMU,
> like, tracetag feature that L3C PMU can only count the specified
> operations by the user, or L3C PMU can give the desired core's statistics
> in the cluster.
> $# perf stat -a -e hisi_sccl3_l3c0/config=0x02,tt_core=0xf/ sleep 5
> 
> $# perf stat -a -e hisi_sccl3_l3c0/config=0x02,tt_req=0x4/ sleep 5

Are these values documented somewhere?

[...]

> +HISI_PMU_EVENT_ATTR_EXTRACTOR(tt_core, config1, 7, 0);
> +HISI_PMU_EVENT_ATTR_EXTRACTOR(tt_req, config1, 10, 8);
> +HISI_PMU_EVENT_ATTR_EXTRACTOR(datasrc_cfg, config1, 15, 11);
> +HISI_PMU_EVENT_ATTR_EXTRACTOR(datasrc_skt, config1, 16, 16);

Could you please mention all of these in the commit message?

IIUC tt_core is a mask of physical cores in the cluster, and I guess
tt_req is a request type, but I have no idea what the datasrc_cfg or
datasrc_skt (socket?) fields represent.

A rough description would be very helpful, something like:

| We expose the tracetag filters with new fields exposed to userspace:
|
| * tt_core is a mask of cores within the PMU's cluster
| * tt_req is ???
| * datasrc_cfg is ???
| * datasrc_skt is ???

Thanks,
Mark.