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2 Qualcomm Technologies Level-2 Cache Performanc
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4
5 This driver supports the L2 cache clusters fou
6 Centriq SoCs. There are multiple physical L2 c
7 own PMU. Each cluster has one or more CPUs ass
8
9 There is one logical L2 PMU exposed, which agg
10 the physical PMUs.
11
12 The driver provides a description of its avail
13 options in sysfs, see /sys/bus/event_source/de
14
15 The "format" directory describes the format of
16
17 Events can be envisioned as a 2-dimensional ar
18 a group of events. There are 8 groups. Only on
19 group can be in use at a time. If multiple eve
20 are specified, the conflicting events cannot b
21
22 Events are specified as 0xCCG, where CC is 2 h
23 the code (array row) and G specifies the group
24
25 In addition there is a cycle counter event spe
26 which is outside the above scheme.
27
28 The driver provides a "cpumask" sysfs attribut
29 consisting of one CPU per cluster which will b
30 events on that cluster.
31
32 Examples for use with perf::
33
34 perf stat -e l2cache_0/config=0x001/,l2cache
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36 perf stat -e l2cache_0/config=0xfe/ -C 2 sle
37
38 The driver does not support sampling, therefor
39 not work. Per-task perf sessions are not suppo
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