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| author | Yicong Yang <yangyicong@hisilicon.com> | 2025-08-14 17:16:20 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2025-09-18 14:54:29 +0100 |
| commit | e31c0eb10388e2af0502b77e61453efbc8a4f974 (patch) | |
| tree | af36fd19e6ff4db9418f9d973ca1a52124a27b57 /Documentation | |
| parent | perf: arm_pmuv3: Factor out PMCCNTR_EL0 use conditions (diff) | |
| download | linux-e31c0eb10388e2af0502b77e61453efbc8a4f974.tar.gz linux-e31c0eb10388e2af0502b77e61453efbc8a4f974.zip | |
drivers/perf: hisi: Add support for HiSilicon NoC PMU
Adds the support for HiSilicon NoC (Network on Chip) PMU which
will be used to monitor the events on the system bus. The PMU
device will be named after the SCL ID (either Super CPU cluster
or Super IO cluster) and the index ID, just similar to other
HiSilicon Uncore PMUs. Below PMU formats are provided besides
the event:
- ch: the transaction channel (data, request, response, etc) which
can be used to filter the counting.
- tt_en: tracetag filtering enable. Just as other HiSilicon Uncore
PMUs the NoC PMU supports only counting the transactions with
tracetag.
The NoC PMU doesn't have an interrupt to indicate the overflow.
However we have a 64 bit counter which is large enough and it's
nearly impossible to overflow.
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/perf/hisi-pmu.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/admin-guide/perf/hisi-pmu.rst b/Documentation/admin-guide/perf/hisi-pmu.rst index 48992a0b8e94..6f0ea4f641cc 100644 --- a/Documentation/admin-guide/perf/hisi-pmu.rst +++ b/Documentation/admin-guide/perf/hisi-pmu.rst @@ -112,6 +112,17 @@ uring channel. It is 2 bits. Some important codes are as follows: - 2'b00: default value, count the events which sent to the both uring and uring_ext channel; +6. ch: NoC PMU supports filtering the event counts of certain transaction +channel with this option. The current supported channels are as follows: + +- 3'b010: Request channel +- 3'b100: Snoop channel +- 3'b110: Response channel +- 3'b111: Data channel + +7. tt_en: NoC PMU supports counting only transactions that have tracetag set +if this option is set. See the 2nd list for more information about tracetag. + Users could configure IDs to count data come from specific CCL/ICL, by setting srcid_cmd & srcid_msk, and data desitined for specific CCL/ICL by setting tgtid_cmd & tgtid_msk. A set bit in srcid_msk/tgtid_msk means the PMU will not |