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+#!/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+import subprocess
+from shutil import which
+from os import pread
+
+# CDLL calls dlopen underneath.
+# Calling it with None (null), we get handle to the our own image (python interpreter).
+# We hope to find sched_getcpu() inside ;]
+# This is a bit ugly, but helps shipping working software, so..
+try:
+ import ctypes
+
+ this_image = ctypes.CDLL(None)
+ BASE_CPU = this_image.sched_getcpu()
+except:
+ BASE_CPU = 0 # If we fail, set to 0 and pray it's not offline.
+
+MSR_IA32_MPERF = 0x000000e7
+MSR_IA32_APERF = 0x000000e8
+
+def check_perf_access():
+ perf = which('perf')
+ if perf is None:
+ print('SKIP: Could not find perf binary, thus could not determine perf access.')
+ return False
+
+ def has_perf_counter_access(counter_name):
+ proc_perf = subprocess.run([perf, 'stat', '-e', counter_name, '--timeout', '10'],
+ capture_output = True)
+
+ if proc_perf.returncode != 0:
+ print(f'SKIP: Could not read {counter_name} perf counter, assuming no access.')
+ return False
+
+ if b'<not supported>' in proc_perf.stderr:
+ print(f'SKIP: Could not read {counter_name} perf counter, assuming no access.')
+ return False
+
+ return True
+
+ if not has_perf_counter_access('msr/mperf/'):
+ return False
+ if not has_perf_counter_access('msr/aperf/'):
+ return False
+ if not has_perf_counter_access('msr/smi/'):
+ return False
+
+ return True
+
+def check_msr_access():
+ try:
+ file_msr = open(f'/dev/cpu/{BASE_CPU}/msr', 'rb')
+ except:
+ return False
+
+ if len(pread(file_msr.fileno(), 8, MSR_IA32_MPERF)) != 8:
+ return False
+
+ if len(pread(file_msr.fileno(), 8, MSR_IA32_APERF)) != 8:
+ return False
+
+ return True
+
+has_perf_access = check_perf_access()
+has_msr_access = check_msr_access()
+
+turbostat_counter_source_opts = ['']
+
+if has_msr_access:
+ turbostat_counter_source_opts.append('--no-perf')
+else:
+ print('SKIP: doesn\'t have MSR access, skipping run with --no-perf')
+
+if has_perf_access:
+ turbostat_counter_source_opts.append('--no-msr')
+else:
+ print('SKIP: doesn\'t have perf access, skipping run with --no-msr')
+
+if not has_msr_access and not has_perf_access:
+ print('SKIP: No MSR nor perf access detected. Skipping the tests entirely')
+ exit(0)
+
+turbostat = which('turbostat')
+if turbostat is None:
+ print('Could not find turbostat binary')
+ exit(1)
+
+timeout = which('timeout')
+if timeout is None:
+ print('Could not find timeout binary')
+ exit(1)
+
+proc_turbostat = subprocess.run([turbostat, '--list'], capture_output = True)
+if proc_turbostat.returncode != 0:
+ print(f'turbostat failed with {proc_turbostat.returncode}')
+ exit(1)
+
+EXPECTED_COLUMNS_DEBUG_DEFAULT = b'usec\tTime_Of_Day_Seconds\tAPIC\tX2APIC'
+
+SMI_APERF_MPERF_DEPENDENT_BICS = [
+ 'SMI',
+ 'Avg_MHz',
+ 'Busy%',
+ 'Bzy_MHz',
+]
+if has_perf_access:
+ SMI_APERF_MPERF_DEPENDENT_BICS.append('IPC')
+
+for bic in SMI_APERF_MPERF_DEPENDENT_BICS:
+ for counter_source_opt in turbostat_counter_source_opts:
+
+ # Ugly special case, but it is what it is..
+ if counter_source_opt == '--no-perf' and bic == 'IPC':
+ continue
+
+ expected_columns = bic.encode()
+ expected_columns_debug = EXPECTED_COLUMNS_DEBUG_DEFAULT + f'\t{bic}'.encode()
+
+ #
+ # Run turbostat for some time and send SIGINT
+ #
+ timeout_argv = [timeout, '--preserve-status', '-s', 'SIGINT', '-k', '3', '0.2s']
+ turbostat_argv = [turbostat, '-i', '0.50', '--show', bic]
+
+ if counter_source_opt:
+ turbostat_argv.append(counter_source_opt)
+
+ print(f'Running turbostat with {turbostat_argv=}... ', end = '', flush = True)
+ proc_turbostat = subprocess.run(timeout_argv + turbostat_argv, capture_output = True)
+ if proc_turbostat.returncode != 0:
+ print(f'turbostat failed with {proc_turbostat.returncode}')
+ exit(1)
+
+ actual_columns = proc_turbostat.stdout.split(b'\n')[0]
+ if expected_columns != actual_columns:
+ print(f'turbostat column check failed\n{expected_columns=}\n{actual_columns=}')
+ exit(1)
+ print('OK')
+
+ #
+ # Same, but with --debug
+ #
+ turbostat_argv.append('--debug')
+
+ print(f'Running turbostat with {turbostat_argv=}... ', end = '', flush = True)
+ proc_turbostat = subprocess.run(timeout_argv + turbostat_argv, capture_output = True)
+ if proc_turbostat.returncode != 0:
+ print(f'turbostat failed with {proc_turbostat.returncode}')
+ exit(1)
+
+ actual_columns = proc_turbostat.stdout.split(b'\n')[0]
+ if expected_columns_debug != actual_columns:
+ print(f'turbostat column check failed\n{expected_columns_debug=}\n{actual_columns=}')
+ exit(1)
+ print('OK')