perf test: Skip perf probe tests when running as non-root

perf trace requires root because it needs to use [ku]probes.
Skip those test when it's not run as root.

Before:
  $ perf test probe
   47: Probe SDT events                                                : Ok
  104: test perf probe of function from different CU                   : FAILED!
  115: perftool-testsuite_probe                                        : FAILED!
  117: Add vfs_getname probe to get syscall args filenames             : FAILED!
  118: probe libc's inet_pton & backtrace it with ping                 : FAILED!
  119: Use vfs_getname probe to get syscall args filenames             : FAILED!

After:
  $ perf test probe
   47: Probe SDT events                                                : Ok
  104: test perf probe of function from different CU                   : Skip
  115: perftool-testsuite_probe                                        : Skip
  117: Add vfs_getname probe to get syscall args filenames             : Skip
  118: probe libc's inet_pton & backtrace it with ping                 : Skip
  119: Use vfs_getname probe to get syscall args filenames             : Skip

Tested-by: Thomas Falcon <thomas.falcon@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20250304022837.1877845-3-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/tests/shell/perftool-testsuite_probe.sh

@@ -2,6 +2,7 @@
 # perftool-testsuite_probe (exclusive)
 # SPDX-License-Identifier: GPL-2.0
 
+[ "$(id -u)" = 0 ] || exit 2
 test -d "$(dirname "$0")/base_probe" || exit 2
 cd "$(dirname "$0")/base_probe" || exit 2
 status=0

tools/perf/tests/shell/probe_vfs_getname.sh

@@ -8,6 +8,7 @@
 . "$(dirname $0)"/lib/probe.sh
 
 skip_if_no_perf_probe || exit 2
+[ "$(id -u)" = 0 ] || exit 2
 
 # shellcheck source=lib/probe_vfs_getname.sh
 . "$(dirname $0)"/lib/probe_vfs_getname.sh

tools/perf/tests/shell/record+probe_libc_inet_pton.sh

@@ -105,6 +105,7 @@ delete_libc_inet_pton_event() {
 
 # Check for IPv6 interface existence
 ip a sh lo | grep -F -q inet6 || exit 2
+[ "$(id -u)" = 0 ] || exit 2
 
 skip_if_no_perf_probe && \
 add_libc_inet_pton_event && \

tools/perf/tests/shell/record+script_probe_vfs_getname.sh

@@ -13,6 +13,7 @@
 . "$(dirname "$0")/lib/probe.sh"
 
 skip_if_no_perf_probe || exit 2
+[ "$(id -u)" = 0 ] || exit 2
 
 # shellcheck source=lib/probe_vfs_getname.sh
 . "$(dirname "$0")/lib/probe_vfs_getname.sh"

tools/perf/tests/shell/test_uprobe_from_different_cu.sh

@@ -4,12 +4,11 @@
 
 set -e
 
-# Skip if there's no probe command.
-if ! perf | grep probe
-then
-        echo "Skip: probe command isn't present"
-        exit 2
-fi
+# shellcheck source=lib/probe.sh
+. "$(dirname $0)"/lib/probe.sh
+
+skip_if_no_perf_probe || exit 2
+[ "$(id -u)" == 0 ] || exit 2
 
 # skip if there's no gcc
 if ! [ -x "$(command -v gcc)" ]; then