122 lines
3.2 KiB
Bash
Executable File
122 lines
3.2 KiB
Bash
Executable File
#!/bin/bash
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# AMD IBS software filtering
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cpu_family() {
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grep -m1 '^cpu family[[:space:]]*:' /proc/cpuinfo \
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| awk -F: '{gsub(/^[ \t]+/, "", $2); print $2}'
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}
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cpu_model() {
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grep -m1 '^model[[:space:]]*:' /proc/cpuinfo \
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| awk -F: '{gsub(/^[ \t]+/, "", $2); print $2}'
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}
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# IBS PMUs does not advertize privilege filtering capability. Rely
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# on Family / Model check.
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hw_priv_filter_supported() {
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family=$(cpu_family)
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model=$(cpu_model)
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if (( family > 0x1a )) ||
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{ (( family == 0x1a )) &&
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{ { (( model >= 0x50 && model <= 0x5f )) ||
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(( model >= 0x80 && model <= 0xaf )) ||
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(( model >= 0xc0 && model <= 0xcf )); }; }; }; then
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return 0 # True
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else
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return 1 # False
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fi
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}
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ParanoidAndNotRoot() {
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[ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
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}
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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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err=0
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# setting any modifiers should fail
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if ! hw_priv_filter_supported; then
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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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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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if ! ParanoidAndNotRoot 1
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then
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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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else
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echo "[SKIP] not root and perf_event_paranoid too high for exclude_user"
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err=2
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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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if ! ParanoidAndNotRoot 0
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then
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perf record -aB --synth=no -e ibs_op/swfilt/k -o /dev/null true
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if [ $? -ne 0 ]; then
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echo "[FAIL] IBS op PMU cannot handle swfilt in system-wide mode"
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exit 1
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fi
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else
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echo "[SKIP] not root and perf_event_paranoid too high for system-wide/exclude_user"
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err=2
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fi
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echo "check number of samples with swfilt"
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kernel_sample=$(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: " ${kernel_sample}
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exit 1
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fi
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if ! ParanoidAndNotRoot 1
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then
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user_sample=$(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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else
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echo "[SKIP] not root and perf_event_paranoid too high for exclude_user"
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err=2
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fi
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exit $err
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