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#!/bin/sh
# guest_kprobes.sh - (re)install the UVM trace probes used by semfix_watch.py.
# Runs in the guest as root; kprobes do not survive a guest boot, so this must
# run after every VM restart.
#
# uvmt uvm_gpu_tracking_semaphore_update_completed_value sem=%di
# uvch __uvm_push_begin_acquire_on_channel_with_info ch=%di
# uvbp uvm_pushbuffer_begin_push pb=%di
# uvpbf uvm_pushbuffer_create pb=%si
#
# Tries the plain symbol first (module symbols usually resolve), then the
# module:symbol spelling, then without the fetch argument (fetchargs on some
# symbols are rejected).
TR=/sys/kernel/tracing
[ -d "$TR" ] || TR=/sys/kernel/debug/tracing
# An enabled kprobe event cannot be deleted (EBUSY); disable the group first.
echo 0 > "$TR/events/kprobes/enable" 2>/dev/null || true
add_probe() {
name=$1; sym=$2; fmt=$3
echo "-:kprobes/$name" >> "$TR/kprobe_events" 2>/dev/null
echo "-:$name" >> "$TR/kprobe_events" 2>/dev/null
if ! grep -qw "$sym" /proc/kallsyms 2>/dev/null; then
echo "FAIL $name: symbol $sym not in kallsyms"
return 1
fi
if echo "p:$name $sym $fmt" >> "$TR/kprobe_events" 2>/dev/null; then
if grep -qE "p:[^ ]*[ /]$name( |$)" "$TR/kprobe_events" 2>/dev/null; then
echo "ok $name $sym"
return 0
fi
fi
echo "-:kprobes/$name" >> "$TR/kprobe_events" 2>/dev/null
echo "-:$name" >> "$TR/kprobe_events" 2>/dev/null
if echo "p:$name nvidia_uvm:$sym $fmt" >> "$TR/kprobe_events" 2>/dev/null; then
if grep -qE "p:[^ ]*[ /]$name( |$)" "$TR/kprobe_events" 2>/dev/null; then
echo "ok-module $name $sym"
return 0
fi
fi
echo "-:kprobes/$name" >> "$TR/kprobe_events" 2>/dev/null
echo "-:$name" >> "$TR/kprobe_events" 2>/dev/null
if echo "p:$name $sym" >> "$TR/kprobe_events" 2>/dev/null; then
if grep -qE "p:[^ ]*[ /]$name( |$)" "$TR/kprobe_events" 2>/dev/null; then
echo "ok-bare $name $sym"
return 0
fi
fi
echo "FAIL $name $sym"
return 1
}
add_probe uvmt uvm_gpu_tracking_semaphore_update_completed_value 'sem=%di val=+16(%di):u32'
add_probe uvch __uvm_push_begin_acquire_on_channel_with_info 'ch=%di'
add_probe uvbp uvm_pushbuffer_begin_push 'pb=%di'
add_probe uvpbf uvm_pushbuffer_create 'pb=%si'
echo 1 > "$TR/events/kprobes/enable" 2>/dev/null || true
echo "--- installed probes ---"
grep -E 'uvmt|uvch|uvbp|uvpbf' "$TR/kprobe_events" 2>/dev/null || echo "(none)"
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