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- HiSilicon SoC uncore Performance Monitoring Unit (PMU)
- ======================================================
- The HiSilicon SoC chip includes various independent system device PMUs
- such as L3 cache (L3C), Hydra Home Agent (HHA) and DDRC. These PMUs are
- independent and have hardware logic to gather statistics and performance
- information.
- The HiSilicon SoC encapsulates multiple CPU and IO dies. Each CPU cluster
- (CCL) is made up of 4 cpu cores sharing one L3 cache; each CPU die is
- called Super CPU cluster (SCCL) and is made up of 6 CCLs. Each SCCL has
- two HHAs (0 - 1) and four DDRCs (0 - 3), respectively.
- HiSilicon SoC uncore PMU driver
- ---------------------------------------
- Each device PMU has separate registers for event counting, control and
- interrupt, and the PMU driver shall register perf PMU drivers like L3C,
- HHA and DDRC etc. The available events and configuration options shall
- be described in the sysfs, see :
- /sys/devices/hisi_sccl{X}_<l3c{Y}/hha{Y}/ddrc{Y}>/, or
- /sys/bus/event_source/devices/hisi_sccl{X}_<l3c{Y}/hha{Y}/ddrc{Y}>.
- The "perf list" command shall list the available events from sysfs.
- Each L3C, HHA and DDRC is registered as a separate PMU with perf. The PMU
- name will appear in event listing as hisi_sccl<sccl-id>_module<index-id>.
- where "sccl-id" is the identifier of the SCCL and "index-id" is the index of
- module.
- e.g. hisi_sccl3_l3c0/rd_hit_cpipe is READ_HIT_CPIPE event of L3C index #0 in
- SCCL ID #3.
- e.g. hisi_sccl1_hha0/rx_operations is RX_OPERATIONS event of HHA index #0 in
- SCCL ID #1.
- The driver also provides a "cpumask" sysfs attribute, which shows the CPU core
- ID used to count the uncore PMU event.
- Example usage of perf:
- $# perf list
- hisi_sccl3_l3c0/rd_hit_cpipe/ [kernel PMU event]
- ------------------------------------------
- hisi_sccl3_l3c0/wr_hit_cpipe/ [kernel PMU event]
- ------------------------------------------
- hisi_sccl1_l3c0/rd_hit_cpipe/ [kernel PMU event]
- ------------------------------------------
- hisi_sccl1_l3c0/wr_hit_cpipe/ [kernel PMU event]
- ------------------------------------------
- $# perf stat -a -e hisi_sccl3_l3c0/rd_hit_cpipe/ sleep 5
- $# perf stat -a -e hisi_sccl3_l3c0/config=0x02/ sleep 5
- The current driver does not support sampling. So "perf record" is unsupported.
- Also attach to a task is unsupported as the events are all uncore.
- Note: Please contact the maintainer for a complete list of events supported for
- the PMU devices in the SoC and its information if needed.
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