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#!/bin/bash
# kret.sh - kretprobe the nvGpuOps* call chain in the guest's nvidia.ko and
# capture return values while /tmp/cdt runs. Run with sudo.
set -u
TR=/sys/kernel/tracing
SYMS="nvGpuOpsGetGpuInfo nvGpuOpsDeviceCreate nvGpuOpsRmDeviceCreate \
nvGpuOpsRmSubDeviceCreate queryFbInfo findDeviceClasses queryVirtMode \
getSysmemLinkInfo getSystemMemoryWindow getNvswitchInfo getEgmInfo getAtsInfo \
nvGpuOpsQueryGpuConfidentialComputeCaps allocNvlinkStatus"
echo > $TR/kprobe_events
for f in $SYMS; do
if ! grep -q " [tT] $f\b" /proc/kallsyms; then
echo "skip $f (not in kallsyms)"
continue
fi
if ! echo "r:ret_$f $f \$retval" >> $TR/kprobe_events 2>/dev/null; then
echo "FAILED to register $f"
fi
done
echo "--- registered:"
grep ret_ $TR/kprobe_events 2>/dev/null | head -20
if [ -d $TR/events/kprobes ]; then
echo 1 > $TR/events/kprobes/enable
dmesg -C
/tmp/cdt >/dev/null 2>&1
echo "--- results (retval per probe):"
grep -E "ret_" $TR/trace | awk '{n=$4; sub(/^ret_/,"",n); printf "%s %s\n", n, $NF}' | sort | uniq -c | sort -rn | head -30
echo 0 > $TR/events/kprobes/enable
echo > $TR/trace
fi
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