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>
e31c0eb103