perf tools: Fix auto-complete on aarch64

On aarch64 CPU related events are not under event_source/devices/cpu/events,
they're under event_source/devices/armv8_pmuv3_0/events on my machine.
Using current auto-complete script will generate below error:

  [root@localhost bin]# perf stat -e
  ls: cannot access '/sys/bus/event_source/devices/cpu/events': No such file or directory

Fix this by not testing /sys/bus/event_source/devices/cpu/events on
aarch64 machine.

Fixes: 74cd5815d9af6e6c ("perf tool: Improve bash command line auto-complete for multiple events with comma")
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linuxarm@huawei.com
Cc: prime.zeng@hisilicon.com
Link: https://lore.kernel.org/r/20230207035057.43394-1-yangyicong@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/perf-completion.sh b/tools/perf/perf-completion.sh
index fdf75d45efff7a413347d215851f93f2a8f5bfb3..978249d7868c22e875720e73550eaf0897999c64 100644 (file)
--- a/tools/perf/perf-completion.sh
+++ b/tools/perf/perf-completion.sh
@@ -165,7 +165,12 @@ __perf_main ()
 
                local cur1=${COMP_WORDS[COMP_CWORD]}
                local raw_evts=$($cmd list --raw-dump)
-               local arr s tmp result
+               local arr s tmp result cpu_evts
+
+               # aarch64 doesn't have /sys/bus/event_source/devices/cpu/events
+               if [[ `uname -m` != aarch64 ]]; then
+                       cpu_evts=$(ls /sys/bus/event_source/devices/cpu/events)
+               fi
 
                if [[ "$cur1" == */* && ${cur1#*/} =~ ^[A-Z] ]]; then
                        OLD_IFS="$IFS"
@@ -183,9 +188,9 @@ __perf_main ()
                                fi
                        done
 
-                       evts=${result}" "$(ls /sys/bus/event_source/devices/cpu/events)
+                       evts=${result}" "${cpu_evts}
                else
-                       evts=${raw_evts}" "$(ls /sys/bus/event_source/devices/cpu/events)
+                       evts=${raw_evts}" "${cpu_evts}
                fi
 
                if [[ "$cur1" == , ]]; then