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The kernel v6.14 added 'swfilt' to support privilege filtering in software so that IBS can be used by regular users. Add a test case in x86 to verify the behavior. $ sudo perf test -vv 'IBS software filter' 113: AMD IBS software filtering: --- start --- test child forked, pid 178826 check availability of IBS swfilt run perf record with modifier and swfilt [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] [ perf record: Woken up 0 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] check number of samples with swfilt [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.037 MB - ] [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.041 MB - ] ---- end(0) ---- 113: AMD IBS software filtering : Ok Reviewed-by: Ravi Bangoria <ravi.bangoria@amd.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> # On a 9950x3d Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20250524002754.1266681-1-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
68 lines
1.8 KiB
Bash
Executable File
68 lines
1.8 KiB
Bash
Executable File
#!/bin/sh
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# AMD IBS software filtering
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echo "check availability of IBS swfilt"
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# check if IBS PMU is available
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if [ ! -d /sys/bus/event_source/devices/ibs_op ]; then
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echo "[SKIP] IBS PMU does not exist"
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exit 2
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fi
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# check if IBS PMU has swfilt format
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if [ ! -f /sys/bus/event_source/devices/ibs_op/format/swfilt ]; then
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echo "[SKIP] IBS PMU does not have swfilt"
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exit 2
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fi
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echo "run perf record with modifier and swfilt"
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# setting any modifiers should fail
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perf record -B -e ibs_op//u -o /dev/null true 2> /dev/null
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if [ $? -eq 0 ]; then
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echo "[FAIL] IBS PMU should not accept exclude_kernel"
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exit 1
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fi
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# setting it with swfilt should be fine
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perf record -B -e ibs_op/swfilt/u -o /dev/null true
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if [ $? -ne 0 ]; then
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echo "[FAIL] IBS op PMU cannot handle swfilt for exclude_kernel"
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exit 1
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fi
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# setting it with swfilt=1 should be fine
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perf record -B -e ibs_op/swfilt=1/k -o /dev/null true
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if [ $? -ne 0 ]; then
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echo "[FAIL] IBS op PMU cannot handle swfilt for exclude_user"
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exit 1
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fi
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# check ibs_fetch PMU as well
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perf record -B -e ibs_fetch/swfilt/u -o /dev/null true
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if [ $? -ne 0 ]; then
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echo "[FAIL] IBS fetch PMU cannot handle swfilt for exclude_kernel"
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exit 1
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fi
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# check system wide recording
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perf record -aB --synth=no -e ibs_op/swfilt/k -o /dev/null true
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if [ $? -ne 0 ]; then
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echo "[FAIL] IBS op PMU cannot handle swfilt in system-wide mode"
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exit 1
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fi
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echo "check number of samples with swfilt"
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kernel_sample=$(perf record -e ibs_op/swfilt/u -o- true | perf script -i- -F misc | grep -c ^K)
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if [ ${kernel_sample} -ne 0 ]; then
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echo "[FAIL] unexpected kernel samples: " ${kernel_sample}
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exit 1
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fi
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user_sample=$(perf record -e ibs_fetch/swfilt/k -o- true | perf script -i- -F misc | grep -c ^U)
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if [ ${user_sample} -ne 0 ]; then
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echo "[FAIL] unexpected user samples: " ${user_sample}
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exit 1
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fi
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