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Newer AMD CPUs will provide privilege filtering via the RIP[63] bit, making swfilt redundant. Remove the perf unit test that assumes IBS has no hardware-assisted privilege filter. swfilt is ignored by kernel on platforms that support RIP[63] bit filter i.e. all amd-ibs-swfilt.sh tests will test hardware assisted privilege filter. Without the patch: # ./perf test -vv 75 test child forked, pid 26029 check availability of IBS swfilt run perf record with modifier and swfilt [FAIL] IBS PMU should not accept exclude_kernel 75: AMD IBS software filtering : FAILED! With the patch: # ./perf test -vv 75 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 1 times to write data ] [ perf record: Captured and wrote 0.000 MB /dev/null ] check number of samples with swfilt [ perf record: Woken up 5 times to write data ] [ perf record: Captured and wrote 0.040 MB - ] [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.054 MB - ] 75: AMD IBS software filtering : Ok Signed-off-by: Ravi Bangoria --- tools/perf/tests/shell/amd-ibs-swfilt.sh | 7 ------- 1 file changed, 7 deletions(-) diff --git a/tools/perf/tests/shell/amd-ibs-swfilt.sh b/tools/perf/tests/shell/amd-ibs-swfilt.sh index e7f66df05c4b..92ef45bf3043 100755 --- a/tools/perf/tests/shell/amd-ibs-swfilt.sh +++ b/tools/perf/tests/shell/amd-ibs-swfilt.sh @@ -22,13 +22,6 @@ fi echo "run perf record with modifier and swfilt" err=0 -# setting any modifiers should fail -perf record -B -e ibs_op//u -o /dev/null true 2> /dev/null -if [ $? -eq 0 ]; then - echo "[FAIL] IBS PMU should not accept exclude_kernel" - exit 1 -fi - # setting it with swfilt should be fine perf record -B -e ibs_op/swfilt/u -o /dev/null true if [ $? -ne 0 ]; then -- 2.43.0