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Diffstat (limited to 'Documentation/perf/hisi-pmu.txt')
| -rw-r--r-- | Documentation/perf/hisi-pmu.txt | 53 |
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diff --git a/Documentation/perf/hisi-pmu.txt b/Documentation/perf/hisi-pmu.txt deleted file mode 100644 index 267a028b2741..000000000000 --- a/Documentation/perf/hisi-pmu.txt +++ /dev/null @@ -1,53 +0,0 @@ -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. |