def test_hardware_pstates(ratio_to_control_value):
old_mwait = {}
try:
MSR_PLATFORM_INFO = 0xce
IA32_PERF_CTL = 0x199
min_ratio = testmsr.MSR("maximum efficiency ratio", bits.bsp_apicid(), MSR_PLATFORM_INFO, highbit=47, lowbit=40)[0]
max_ratio = testmsr.MSR("max non-turbo ratio", bits.bsp_apicid(), MSR_PLATFORM_INFO, highbit=15, lowbit=8)[0]
# Get the Turbo Mode Availability flag
turbo_mode_available = bits.cpuid(bits.bsp_apicid(),0).eax >= 6 and (bits.cpuid(bits.bsp_apicid(),6).eax & 0x2)
last_ratio = max_ratio
if turbo_mode_available:
last_ratio += 1
duration = last_ratio - min_ratio + 1
if turbo_mode_available:
duration += 2
print "Test duration is ~{} seconds...".format(duration)
# Force use of MWAIT C3
hint = 0x20
cpus = bits.cpus()
for apicid in cpus:
old_mwait[apicid] = bits.get_mwait(apicid)
bits.set_mwait(apicid, True, hint)
bclk = testutil.adjust_to_nearest(bits.bclk(), 100.0/12) * 1000000
for ratio in range(min_ratio, last_ratio + 1):
control_value = ratio_to_control_value(ratio, min_ratio, max_ratio)
for apicid in cpus:
bits.wrmsr(apicid, IA32_PERF_CTL, control_value)
if ratio == max_ratio + 1:
# Needs to busywait, not sleep
start = time.time()
while (time.time() - start < 2):
pass
aperf = bits.cpu_frequency()[1]
aperf = testutil.adjust_to_nearest(aperf, bclk/2)
aperf = int(aperf / 1000000)
expected = int(ratio * bclk / 1000000)
if ratio == max_ratio + 1:
testsuite.test("Turbo measured frequency {} >= expected {} MHz".format(aperf, expected), aperf >= expected)
else:
testsuite.test("Ratio {} measured frequency {} MHz == expected {} MHz".format(ratio, aperf, expected), aperf == expected)
finally:
for apicid, old_mwait_values in old_mwait.iteritems():
bits.set_mwait(apicid, *old_mwait_values)
def use_hint(hint=None):
"""Context manager to temporarily set the mwait hint of all CPUs"""
global default_hint
if hint is None:
hint = default_hint
old_mwait = {}
try:
for apicid in bits.cpus():
old_mwait[apicid] = bits.get_mwait(apicid)
bits.set_mwait(apicid, True, hint)
yield
finally:
for apicid, old_mwait_values in old_mwait.iteritems():
bits.set_mwait(apicid, *old_mwait_values)
def use_hint(hint=None):
"""Context manager to temporarily set the mwait hint of all CPUs"""
global default_hint
if hint is None:
hint = default_hint
old_mwait = {}
try:
for apicid in bits.cpus():
old_mwait[apicid] = bits.get_mwait(apicid)
bits.set_mwait(apicid, True, hint)
yield
finally:
for apicid, old_mwait_values in old_mwait.iteritems():
bits.set_mwait(apicid, *old_mwait_values)
def test_pstates():
"""Execute and verify frequency for each Pstate in the _PSS"""
old_mwait = {}
try:
IA32_PERF_CTL = 0x199
# Force use of MWAIT C3
hint = 0x20
cpus = bits.cpus()
for apicid in cpus:
old_mwait[apicid] = bits.get_mwait(apicid)
bits.set_mwait(apicid, True, hint)
cpupath_procid = acpi.find_procid()
cpupath_uid = acpi.find_uid()
procid_apicid, uid_x2apicid = acpi.parse_apic()
def cpupath_apicid(cpupath):
if procid_apicid is not None:
procid = cpupath_procid.get(cpupath, None)
if procid is not None:
apicid = procid_apicid.get(procid, None)
if apicid is not None:
return apicid
if uid_x2apicid is not None:
uid = cpupath_uid.get(cpupath, None)
if uid is not None:
apicid = uid_x2apicid.get(uid, None)
if apicid is not None:
return apicid
return bits.cpus()[0]
bclk = testutil.adjust_to_nearest(bits.bclk(), 100.0/12) * 1000000
uniques = acpi.parse_cpu_method("_PSS")
for pss, cpupaths in uniques.iteritems():
if not testsuite.test("_PSS must exist", pss is not None):
testsuite.print_detail(acpi.factor_commonprefix(cpupaths))
testsuite.print_detail('No _PSS exists')
continue
print "Test duration is ~{} seconds...".format(len(pss.pstates) + 2)
for n, pstate in enumerate(pss.pstates):
for cpupath in cpupaths:
apicid = cpupath_apicid(cpupath)
if apicid is None:
print 'Failed to find apicid for cpupath {}'.format(cpupath)
continue
bits.wrmsr(apicid, IA32_PERF_CTL, pstate.control)
# Detecting Turbo frequency requires at least 2 pstates
# since turbo frequency = max non-turbo frequency + 1
turbo = False
if len(pss.pstates) >= 2:
turbo = (n == 0 and pstate.core_frequency == (pss.pstates[1].core_frequency + 1))
if turbo:
# Needs to busywait, not sleep
start = time.time()
while (time.time() - start < 2):
pass
# Abort the test if no cpu frequency is not available
if bits.cpu_frequency() is None:
continue
aperf = bits.cpu_frequency()[1]
aperf = testutil.adjust_to_nearest(aperf, bclk/2)
aperf = int(aperf / 1000000)
if turbo:
testsuite.test("P{}: Turbo measured frequency {} >= expected {} MHz".format(n, aperf, pstate.core_frequency), aperf >= pstate.core_frequency)
else:
testsuite.test("P{}: measured frequency {} MHz == expected {} MHz".format(n, aperf, pstate.core_frequency), aperf == pstate.core_frequency)
finally:
for apicid, old_mwait_values in old_mwait.iteritems():
bits.set_mwait(apicid, *old_mwait_values)